#!/usr/bin/env python
# License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>


import os
import re
from collections import namedtuple
from contextlib import suppress
from functools import lru_cache, partial

from qt.core import (
    QAction,
    QApplication,
    QClipboard,
    QColor,
    QDialog,
    QEasingCurve,
    QFontMetrics,
    QIcon,
    QKeySequence,
    QMenu,
    QMimeData,
    QPainter,
    QPalette,
    QPen,
    QPixmap,
    QPropertyAnimation,
    QRect,
    QSize,
    QSizePolicy,
    QSplitter,
    Qt,
    QTimer,
    QUrl,
    QWidget,
    pyqtProperty,
    pyqtSignal,
)

from calibre import fit_image, sanitize_file_name
from calibre.constants import config_dir, iswindows
from calibre.db.constants import DATA_DIR_NAME, DATA_FILE_PATTERN, RESOURCE_URL_SCHEME
from calibre.ebooks import BOOK_EXTENSIONS
from calibre.ebooks.metadata.book.base import Metadata, field_metadata
from calibre.ebooks.metadata.book.render import mi_to_html
from calibre.ebooks.metadata.search_internet import all_author_searches, all_book_searches, name_for, url_for_author_search, url_for_book_search
from calibre.gui2 import (
    NO_URL_FORMATTING,
    choose_save_file,
    clip_border_radius,
    config,
    default_author_link,
    gprefs,
    pixmap_to_data,
    question_dialog,
    rating_font,
    safe_open_url,
)
from calibre.gui2.dialogs.confirm_delete import confirm
from calibre.gui2.dialogs.confirm_delete import confirm as confirm_delete
from calibre.gui2.dnd import dnd_get_files, dnd_get_image, dnd_has_extension, dnd_has_image, image_extensions
from calibre.gui2.widgets2 import HTMLDisplay
from calibre.startup import connect_lambda
from calibre.utils.config import tweaks
from calibre.utils.img import blend_image, image_from_x
from calibre.utils.localization import is_rtl, langnames_to_langcodes
from calibre.utils.resources import get_path as P
from calibre.utils.serialize import json_loads
from polyglot.binary import from_hex_bytes

InternetSearch = namedtuple('InternetSearch', 'author where')


def db_for_mi(mi):
    from calibre.gui2.ui import get_gui
    lp = getattr(mi, 'external_library_path', None)
    if lp:
        return get_gui().library_broker.get_library(lp), True
    return get_gui().current_db, False


def set_html(mi, html, text_browser):
    book_id = getattr(mi, 'id', None)
    search_paths = []
    db, _ = db_for_mi(mi)
    if db and book_id is not None:
        path = db.abspath(book_id, index_is_id=True)
        if path:
            search_paths = [path]
    text_browser.setSearchPaths(search_paths)
    text_browser.setHtml(html)


def css(reset=False):
    if reset:
        del css.ans
    if not hasattr(css, 'ans'):
        val = P('templates/book_details.css', data=True).decode('utf-8')
        css.ans = re.sub(r'/\*.*?\*/', '', val, flags=re.DOTALL)
        if iswindows:
            # On Windows the default monospace font family is Courier which is ugly
            css.ans = 'pre { font-family: "Segoe UI Mono", "Consolas", monospace; }\n\n' + css.ans
    return css.ans


def resolve_colors(css):
    app = QApplication.instance()
    col = app.palette().color(QPalette.ColorRole.PlaceholderText).name() if app.is_dark_theme else '#666'
    return css.replace('palette(placeholder-text)', col)


def resolved_css():
    return resolve_colors(css())


def copy_all(text_browser):
    mf = getattr(text_browser, 'details', text_browser)
    c = QApplication.clipboard()
    md = QMimeData()
    html = mf.toHtml()
    md.setHtml(html)
    from html5_parser import parse
    from lxml import etree
    root = parse(html)
    tables = tuple(root.iterdescendants('table'))
    for tag in root.iterdescendants(('table', 'tr', 'tbody')):
        tag.tag = 'div'
    parent = root
    is_vertical = getattr(text_browser, 'vertical', True)
    if not is_vertical:
        parent = tables[1]
    for tag in parent.iterdescendants('td'):
        for child in tag.iterdescendants('br'):
            child.tag = 'span'
            child.text = '\ue000'
        tt = etree.tostring(tag, method='text', encoding='unicode')
        tag.tag = 'span'
        for child in tuple(tag):
            tag.remove(child)
        tag.text = tt.strip()
    if not is_vertical:
        for tag in root.iterdescendants('td'):
            tag.tag = 'div'
    for tag in root.iterdescendants('a'):
        tag.attrib.pop('href', None)
    from calibre.utils.html2text import html2text
    simplified_html = etree.tostring(root, encoding='unicode')
    txt = html2text(simplified_html, single_line_break=True).strip()
    txt = txt.replace('\ue000', '\n\t')
    if iswindows:
        txt = os.linesep.join(txt.splitlines())
    # print(simplified_html)
    # print(txt)
    md.setText(txt)
    c.setMimeData(md)


def create_search_internet_menu(callback, author=None):
    m = QMenu(
        _('Search the internet for the author {}').format(author)
        if author is not None else
        _('Search the internet for this book')
    )
    m.menuAction().setIcon(QIcon.ic('search.png'))
    items = all_book_searches() if author is None else all_author_searches()
    for k in sorted(items, key=lambda k: name_for(k).lower()):
        m.addAction(QIcon.ic('search.png'), name_for(k), partial(callback, InternetSearch(author, k)))
    return m


def is_category(field):
    from calibre.db.categories import find_categories
    from calibre.gui2.ui import get_gui
    gui = get_gui()
    fm = gui.current_db.field_metadata
    return field in {x[0] for x in find_categories(fm) if fm.is_custom_field(x[0])}


def is_boolean(field):
    from calibre.gui2.ui import get_gui
    gui = get_gui()
    fm = gui.current_db.field_metadata
    return fm.get(field, {}).get('datatype') == 'bool'


def escape_for_menu(x):
    return x.replace('&', '&&')


def init_manage_action(ac, field, value):
    from calibre.library.field_metadata import category_icon_map
    ic = category_icon_map.get(field) or 'blank.png'
    ac.setIcon(QIcon.ic(ic))
    ac.setText(_('Manage %s') % escape_for_menu(value))
    ac.current_fmt = field, value
    return ac


def add_notes_context_menu_actions(menu, book_info, field, value):
    from calibre.gui2.ui import get_gui
    db = get_gui().current_db.new_api
    if db.field_supports_notes(field):
        item_id = db.get_item_id(field, value)
        if item_id is not None:
            val = escape_for_menu(value)
            def edit_note():
                gui = get_gui()
                from calibre.gui2.dialogs.edit_category_notes import EditNoteDialog
                d = EditNoteDialog(field, item_id, gui.current_db.new_api, parent=book_info)
                if d.exec() == QDialog.DialogCode.Accepted:
                    gui.do_field_item_value_changed()
            ac = menu.addAction(_('Edit note for {}').format(val))
            ac.triggered.connect(edit_note)
            ac.setIcon(QIcon.ic('edit_input.png'))

            def delete_note():
                gui = get_gui()
                if question_dialog(gui, _('Are you sure?'),
                        _('Are you sure you want to delete the note for {} from this library? '
                          'There is no undo.').format(val),
                        skip_dialog_name='book_details_delete_note_context_menu'):
                    db = gui.current_db.new_api
                    db.set_notes_for(field, item_id, '')
                    gui.do_field_item_value_changed()
            ac = menu.addAction(_('Delete note for {}').format(escape_for_menu(value)))
            ac.triggered.connect(delete_note)
            ac.setIcon(QIcon.ic('trash.png'))


def init_find_in_tag_browser(menu, ac, field, value):
    from calibre.gui2.ui import get_gui
    hidden_cats = get_gui().tags_view.model().hidden_categories
    if field not in hidden_cats:
        ac.setIcon(QIcon.ic('search.png'))
        ac.setText(_('Find %s in the Tag browser') % escape_for_menu(value))
        ac.current_fmt = field, value
        menu.addAction(ac)


def download_cover(parent, book_id, current_cover_pixmap):
    from calibre.ebooks.metadata.sources.update import update_sources
    from calibre.gui2.ui import get_gui
    update_sources()
    from calibre.gui2.metadata.single_download import CoverFetch
    db = get_gui().current_db.new_api
    title = db.field_for('title', book_id)
    authors = db.field_for('authors', book_id)
    identifiers = db.field_for('identifiers', book_id, default_value={})
    d = CoverFetch(current_cover_pixmap, parent)
    if d.start(title, authors, identifiers) == QDialog.DialogCode.Accepted:
        return d.cover_pixmap


def get_icon_path(f, prefix):
    from calibre.library.field_metadata import category_icon_map
    custom_icons = gprefs['tags_browser_category_icons']
    ci = custom_icons.get(prefix + f, '')
    if ci:
        icon_path = os.path.join(config_dir, 'tb_icons', ci)
    elif prefix:
        icon_path = category_icon_map['gst']
    else:
        icon_path = category_icon_map.get(f, 'search.png')
    return icon_path


def init_find_in_grouped_search(menu, field, value, book_info):
    from calibre.gui2.ui import get_gui
    db = get_gui().current_db
    fm = db.field_metadata
    field_name = fm.get(field, {}).get('name', None)
    if field_name is None:
        # I don't think this can ever happen, but ...
        return
    gsts = db.prefs.get('grouped_search_terms', {})
    gsts_to_show = []
    for v in gsts:
        fk = fm.search_term_to_field_key(v)
        if field in fk:
            gsts_to_show.append(v)

    if gsts_to_show:
        m = QMenu((_('Search calibre for %s') + '...')%escape_for_menu(value), menu)
        m.setIcon(QIcon.ic('search.png'))
        menu.addMenu(m)
        m.addAction(QIcon.ic(get_icon_path(field, '')),
                    _('in category %s')%escape_for_menu(field_name),
                    lambda g=field: book_info.search_requested(
                            '{}:"={}"'.format(g, value.replace('"', r'\"')), ''))
        for gst in gsts_to_show:
            icon_path = get_icon_path(gst, '@')
            m.addAction(QIcon.ic(icon_path),
                        _('in grouped search %s')%gst,
                        lambda g=gst: book_info.search_requested(
                                '{}:"={}"'.format(g, value.replace('"', r'\"')), ''))
    else:
        menu.addAction(QIcon.ic('search.png'),
            _('Search calibre for {val} in category {name}').format(
                    val=escape_for_menu(value), name=escape_for_menu(field_name)),
            lambda g=field: book_info.search_requested(
                    '{}:"={}"'.format(g, value.replace('"', r'\"')), ''))


@lru_cache(maxsize=2)
def comments_pat():
    return re.compile(r'<!--.*?-->', re.DOTALL)


def render_html(mi, vertical, widget, all_fields=False, render_data_func=None,
                pref_name='book_display_fields',
                pref_value=None):  # {{{
    db, is_external = db_for_mi(mi)
    show_links = not is_external
    func = render_data_func or partial(render_data,
                   vertical_fields=db.prefs.get('book_details_vertical_categories') or ())
    try:
        table, comment_fields = func(mi, all_fields=all_fields, show_links=show_links,
                use_roman_numbers=config['use_roman_numerals_for_series_number'], pref_name=pref_name)
    except TypeError:
        table, comment_fields = func(mi, all_fields=all_fields, show_links=show_links,
                use_roman_numbers=config['use_roman_numerals_for_series_number'])

    def color_to_string(col):
        ans = '#000000'
        if col.isValid():
            col = col.toRgb()
            if col.isValid():
                ans = str(col.name())
        return ans

    comments = ''
    if comment_fields:
        comments = '\n'.join(f'<div>{x}</div>' for x in comment_fields)
        # Comments cause issues with rendering in QTextBrowser
        comments = comments_pat().sub('', comments)

    html = render_parts(table, comments, vertical)
    return html, table, comments


def render_parts(table, comments, vertical):
    templ = '''\
    <html>
        <head></head>
        <body class="%s">
        %%s
        </body>
    <html>
    '''%('vertical' if vertical else 'horizontal')
    right_pane = comments

    if vertical:
        ans = templ%(table+right_pane)
    else:
        ans = templ % (
                f'<table><tr><td valign="top" width="40%">{table}</td><td valign="top" width="60%">{right_pane}</td></tr></table>')
    return ans


def get_field_list(fm, use_defaults=False, pref_name='book_display_fields', mi=None):
    db, _ = db_for_mi(mi)
    if use_defaults:
        src = db.prefs.defaults
    else:
        old_val = gprefs.get(pref_name, None)
        if old_val is not None and not db.prefs.has_setting(pref_name):
            src = gprefs
        else:
            src = db.prefs
    fieldlist = list(src[pref_name])
    names = frozenset(x[0] for x in fieldlist)
    available = frozenset(fm.displayable_field_keys())
    for field in available - names:
        fieldlist.append((field, True))
    return [(f, d) for f, d in fieldlist if f in available]


def render_data(mi, use_roman_numbers=True, all_fields=False, pref_name='book_display_fields',
                vertical_fields=(), show_links=True):
    field_list = get_field_list(getattr(mi, 'field_metadata', field_metadata),
                                pref_name=pref_name, mi=mi)
    field_list = [(x, all_fields or display) for x, display in field_list]
    db, _ = db_for_mi(mi)
    db = db.new_api
    field_maps = {}

    def item_id_if_has_note(field, item_val):
        if db.field_supports_notes(field):
            nmap = field_maps.get(field)
            if nmap is None:
                nmap = field_maps[field] = db.get_item_name_map(field)
            item_id = nmap.get(item_val)
            if item_id is not None:
                if db.notes_for(field, item_id):
                    return item_id

    # Compute the size of the link and note icons by scaling the current font
    # height by the option specified in Preferences / L&F / Book details.
    icon_size = int(QFontMetrics(QApplication.font()).height() * gprefs['book_details_note_link_icon_width'])
    return mi_to_html(
        mi, field_list=field_list, use_roman_numbers=use_roman_numbers, rtl=is_rtl(),
        rating_font=rating_font(), default_author_link=default_author_link(),
        comments_heading_pos=gprefs['book_details_comments_heading_pos'], for_qt=True,
        vertical_fields=vertical_fields, show_links=show_links, item_id_if_has_note=item_id_if_has_note,
        link_note_icon_size=icon_size
    )

# }}}


# Context menu {{{

def add_format_entries(menu, data, book_info, copy_menu, search_menu):
    from calibre.ebooks.oeb.polish.main import SUPPORTED
    from calibre.gui2.ui import get_gui
    book_id = int(data['book_id'])
    fmt = data['fmt']
    init_find_in_tag_browser(search_menu, book_info.find_in_tag_browser_action, 'formats', fmt)
    init_find_in_grouped_search(search_menu, 'formats', fmt, book_info)
    db = get_gui().current_db.new_api
    ofmt = fmt.upper() if fmt.startswith('ORIGINAL_') else 'ORIGINAL_' + fmt
    nfmt = ofmt[len('ORIGINAL_'):]
    fmts = {x.upper() for x in db.formats(book_id)}
    for a, t in [
            ('remove', _('Delete the %s format')),
            ('save', _('Save the %s format to disk')),
            ('restore', _('Restore the %s format')),
            ('compare', ''),
            ('set_cover', _('Set the book cover from the %s file')),
    ]:
        if a == 'restore' and not fmt.startswith('ORIGINAL_'):
            continue
        if a == 'compare':
            if ofmt not in fmts or nfmt not in SUPPORTED:
                continue
            t = _('Compare to the %s format') % (fmt[9:] if fmt.startswith('ORIGINAL_') else ofmt)
        else:
            t = t % fmt
        ac = getattr(book_info, f'{a}_format_action')
        ac.current_fmt = (book_id, fmt)
        ac.setText(t)
        menu.addAction(ac)
    if not fmt.upper().startswith('ORIGINAL_'):
        from calibre.gui2.open_with import edit_programs, populate_menu
        m = QMenu(_('Open %s with...') % fmt.upper())

        def connect_action(ac, entry):
            connect_lambda(ac.triggered, book_info, lambda book_info: book_info.open_with(book_id, fmt, entry))

        populate_menu(m, connect_action, fmt)
        if len(m.actions()) == 0:
            menu.addAction(QIcon.ic('exec.png'), _('Open %s with...') % fmt.upper(), partial(book_info.choose_open_with, book_id, fmt))
        else:
            m.setIcon(QIcon.ic('exec.png'))
            m.addSeparator()
            m.addAction(QIcon.ic('plus.png'), _('Add other application for %s files...') % fmt.upper(), partial(book_info.choose_open_with, book_id, fmt))
            m.addAction(_('Edit Open with applications...'), partial(edit_programs, fmt, book_info))
            menu.addMenu(m)
            menu.ow = m
        if fmt.upper() in SUPPORTED:
            menu.addSeparator()
            menu.addAction(QIcon.ic('edit_book.png'), _('Edit %s format') % fmt.upper(), partial(book_info.edit_fmt, book_id, fmt))
    path = data['path']
    if path:
        if data.get('fname'):
            path = os.path.join(path, data['fname'] + '.' + data['fmt'].lower())
        ac = book_info.copy_link_action
        ac.current_url = path
        ac.setText(_('Path to file'))
        copy_menu.addAction(ac)
    if db.is_fts_enabled():
        menu.addSeparator()
        menu.addAction(
            _('Re-index the {} format for full text searching').format(fmt.upper()), partial(book_info.reindex_fmt, book_id, fmt)).setIcon(
                QIcon.ic('fts.png'))


def add_link_submenu(menu: QMenu, link, book_info, field='', item_name=''):
    if field and item_name:
        m = menu.addMenu(QIcon.ic('external-link'), _('Associated link'))
        m.addAction(QIcon.ic('reference'), _('Open: {}').format(link), lambda: book_info.link_clicked.emit(link))
        m.addAction(QIcon.ic('minus'), _('Remove the link').format(link), lambda: book_info.link_removal_requested.emit(field, item_name))
    else:
        menu.addAction(QIcon.ic('external-link'), _('Open associated link').format(link), lambda: book_info.link_clicked.emit(link))


def add_item_specific_entries(menu, data, book_info, copy_menu, search_menu):
    from calibre.gui2.ui import get_gui
    search_internet_added = False
    find_action = book_info.find_in_tag_browser_action
    dt = data['type']

    def add_copy_action(name):
        copy_menu.addAction(QIcon.ic('edit-copy.png'), _('The text: {}').format(name), lambda: QApplication.instance().clipboard().setText(name))

    if dt == 'format':
        add_format_entries(menu, data, book_info, copy_menu, search_menu)
        data['reindex_fmt_added'] = True
    elif dt == 'author':
        author = data['name']
        if data['url'] != 'calibre':
            ac = book_info.copy_link_action
            ac.current_url = data['url']
            ac.setText(_('&Author link'))
            copy_menu.addAction(ac)
        add_copy_action(author)
        init_find_in_tag_browser(search_menu, find_action, 'authors', author)
        init_find_in_grouped_search(search_menu, 'authors', author, book_info)
        menu.addAction(init_manage_action(book_info.manage_action, 'authors', author))
        add_notes_context_menu_actions(menu, book_info, 'authors', author)
        if hasattr(book_info, 'search_internet'):
            search_menu.addSeparator()
            search_menu.sim = create_search_internet_menu(book_info.search_internet, author)
            for ac in search_menu.sim.actions():
                search_menu.addAction(ac)
                ac.setText(_('Search {0} for {1}').format(ac.text(), author))
            search_internet_added = True
        if hasattr(book_info, 'remove_item_action'):
            ac = book_info.remove_item_action
            book_id = get_gui().library_view.current_id
            ac.data = ('authors', author, book_id)
            ac.setText(_('Remove %s from this book') % escape_for_menu(author))
            menu.addAction(ac)
        # See if we need to add a click associated link menu line for the author
        link_map = get_gui().current_db.new_api.get_all_link_maps_for_book(data.get('book_id', -1))
        link = link_map.get('authors', {}).get(author)
        if link:
            add_link_submenu(menu, link, book_info, 'authors', author)
    elif dt in ('path', 'devpath'):
        path = data['loc']
        ac = book_info.copy_link_action
        if isinstance(path, int):
            path = get_gui().library_view.model().db.abspath(path, index_is_id=True)
        ac.current_url = path
        ac.setText(_('The location of the book'))
        copy_menu.addAction(ac)
    elif dt == 'data-path':
        path = data['loc']
        ac = book_info.copy_link_action
        path = get_gui().library_view.model().db.abspath(data['loc'], index_is_id=True)
        if path:
            path = os.path.join(path, DATA_DIR_NAME)
            ac.current_url = path
            ac.setText(_("The location of the book's data files"))
            copy_menu.addAction(ac)
    else:
        field = data.get('field')
        if field is not None:
            book_id = int(data['book_id'])
            value = remove_value = data['value']
            remove_name = ''
            if field == 'identifiers':
                ac = book_info.copy_link_action
                ac.current_url = value
                ac.setText(_('&Identifier'))
                copy_menu.addAction(ac)
                if data.get('url'):
                    book_info.copy_identifiers_url_action.current_url = data['url']
                    copy_menu.addAction(book_info.copy_identifiers_url_action)
                remove_value = data['id_type']
                init_find_in_tag_browser(search_menu, find_action, field, remove_value)
                init_find_in_grouped_search(search_menu, field, remove_value, book_info)
                menu.addAction(book_info.edit_identifiers_action)
                remove_name = data.get('name') or value
            elif field in ('tags', 'series', 'publisher') or is_category(field):
                add_copy_action(value)
                init_find_in_tag_browser(search_menu, find_action, field, value)
                init_find_in_grouped_search(search_menu, field, value, book_info)
                menu.addAction(init_manage_action(book_info.manage_action, field, value))
                add_notes_context_menu_actions(menu, book_info, field, value)
            elif field == 'languages':
                remove_value = langnames_to_langcodes((value,)).get(value, 'Unknown')
                init_find_in_tag_browser(search_menu, find_action, field, value)
                init_find_in_grouped_search(search_menu, field, value, book_info)
            else:
                v = data.get('original_value') or data.get('value')
                copy_menu.addAction(QIcon.ic('edit-copy.png'), _('The text: {}').format(v),
                                        lambda: QApplication.instance().clipboard().setText(v))
            if field != 'size':
                ac = book_info.remove_item_action
                ac.data = (field, remove_value, book_id)
                ac.setText(_('Remove %s from this book') % escape_for_menu(remove_name or data.get('original_value') or value))
                menu.addAction(ac)
            # See if we need to add a click associated link menu line
            link_map = get_gui().current_db.new_api.get_all_link_maps_for_book(data.get('book_id', -1))
            link = link_map.get(field, {}).get(value)
            if link:
                add_link_submenu(menu, link, book_info, field, value)
        else:
            v = data.get('original_value') or data.get('value')
            if v:
                copy_menu.addAction(QIcon.ic('edit-copy.png'), _('The text: {}').format(v),
                                        lambda: QApplication.instance().clipboard().setText(v))
    return search_internet_added


def create_copy_links(menu, data=None):
    from calibre.gui2.ui import get_gui
    db = get_gui().current_db.new_api
    library_id = getattr(db, 'server_library_id', None)
    if not library_id:
        return
    library_id = '_hex_-' + library_id.encode('utf-8').hex()
    book_id = get_gui().library_view.current_id

    def copy_to_clipboard_action(menu_text, value_text, before_action=None):
        def doit():
            QApplication.instance().clipboard().setText(value_text)
        if before_action is not None:
            action = QWidget(menu).addAction(QIcon.ic('edit-copy.png'), menu_text, doit)
            menu.insertAction(before_action, action)
        else:
            menu.addAction(QIcon.ic('edit-copy.png'), menu_text, doit)

    all_links = []
    def link_action(text, url):
        nonlocal all_links
        all_links.append(url)
        copy_to_clipboard_action(text, url)

    sep = menu.addSeparator()  # Note: separators are really actions

    if data and data.get('type', '') == 'cc_url' and (u := data.get('url', '')):
        link_action(_('Custom web search link'), u)
    link_action(_('Link to show book in calibre'), f'calibre://show-book/{library_id}/{book_id}')
    link_action(_('Link to show book details in a popup window'),
                f'calibre://book-details/{library_id}/{book_id}')
    mi = db.new_api.get_proxy_metadata(book_id)
    if mi and mi.path:
        with suppress(Exception):
            data_files = db.new_api.list_extra_files(book_id, use_cache=True, pattern=DATA_FILE_PATTERN)
            if data_files:
                data_path = os.path.join(db.backend.library_path, mi.path, DATA_DIR_NAME)
                link_action(_("Link to open book's data files folder"),
                            bytes(QUrl.fromLocalFile(data_path).toEncoded()).decode('utf-8'))
    if data:
        if data.get('kind', '') == 'notes':
            field = data['field']
            item_id = data['item_id']
            note_data = db.notes_data_for(field, item_id)
            if note_data is not None:
                copy_to_clipboard_action(_('HTML for note'), note_data['doc'], sep)
                copy_to_clipboard_action(_('Text for note'),
                                         note_data['searchable_text'].partition('\n')[2], sep)
            if field.startswith('#'):
                field = '_' + field[1:]
            url = f'calibre://show-note/{library_id}/{field}/id_{item_id}'
            link_action(_('Link to show note in calibre'), url)
        else:
            field = data.get('field')
            if data['type'] == 'author':
                field = 'authors'
            if (field and field in ('tags', 'series', 'publisher', 'authors')) or is_category(field):
                name = data['name' if data['type'] == 'author' else 'value']
                eq = f'{field}:"={name}"'.encode().hex()
                link_action(_('Link to show books matching {} in calibre').format(name),
                     f'calibre://search/{library_id}?eq={eq}')

    for fmt in db.formats(book_id):
        fmt = fmt.upper()
        link_action(_('Link to view {} format of book').format(fmt.upper()),
                    f'calibre://view-book/{library_id}/{book_id}/{fmt}')

    if all_links:
        menu.addSeparator()
        all_links.insert(0, '')
        all_links.insert(0, mi.get('title') + ' - ' + ' & '.join(mi.get('authors')))
        link_action(_('Copy all the above links'), '\n'.join(all_links))


def details_context_menu_event(view, ev, book_info, add_popup_action=False, edit_metadata=None):
    url = view.anchorAt(ev.pos())
    menu = QMenu(view)
    copy_menu = menu.addMenu(QIcon.ic('edit-copy.png'), _('Copy'))
    copy_menu.addAction(QIcon.ic('edit-copy.png'), _('All book details'), partial(copy_all, view))
    if view.textCursor().hasSelection():
        copy_menu.addAction(QIcon.ic('edit-copy.png'), _('Selected text'), view.copy)
    copy_menu.addSeparator()
    copy_links_added = False
    search_internet_added = False
    search_menu = QMenu(_('Search'), menu)
    search_menu.setIcon(QIcon.ic('search.png'))
    reindex_fmt_added = False
    if url:
        def get_data():
            kind, _, rest = url.partition(':')
            data = json_loads(from_hex_bytes(rest))
            data['kind'] = kind
            return data

        if url.startswith('action:'):
            data = get_data()
            search_internet_added = add_item_specific_entries(menu, data, book_info, copy_menu, search_menu)
            create_copy_links(copy_menu, data)
            copy_links_added = True
            reindex_fmt_added = 'reindex_fmt_added' in data
        elif url.startswith('notes:'):
            data = get_data()
            create_copy_links(copy_menu, data)
            copy_links_added = True
            search_internet_added = True
            add_notes_context_menu_actions(menu, view, data['field'], data['value'])
        elif not url.startswith('#'):
            ac = book_info.copy_link_action
            ac.current_url = url
            ac.setText(_('Copy link location'))
            menu.addAction(ac)
            add_link_submenu(menu, url, book_info)
    if not copy_links_added:
        create_copy_links(copy_menu)

    if not search_internet_added and hasattr(book_info, 'search_internet'):
        sim = create_search_internet_menu(book_info.search_internet)
        if search_menu.isEmpty():
            search_menu = sim
        else:
            search_menu.addSeparator()
            for ac in sim.actions():
                search_menu.addAction(ac)
                ac.setText(_('Search {0} for this book').format(ac.text()))
    if not search_menu.isEmpty():
        menu.addMenu(search_menu)
    for ac in tuple(menu.actions()):
        if not ac.isEnabled():
            menu.removeAction(ac)
    menu.addSeparator()
    from calibre.gui2.ui import get_gui
    if add_popup_action:
        menu.addMenu(get_gui().iactions['Show Book Details'].qaction.menu())
    else:
        # We can't open edit metadata from a locked window because EM expects to
        # be editing the current book, which this book probably isn't
        if edit_metadata is not None:
            ema = get_gui().iactions['Edit Metadata'].menuless_qaction
            menu.addAction(_('Open the Edit metadata window') + '\t' + ema.shortcut().toString(QKeySequence.SequenceFormat.NativeText), edit_metadata)
    if not reindex_fmt_added:
        menu.addSeparator()
        menu.addAction(_(
            'Re-index this book for full text searching'), partial(book_info.reindex_fmt, get_gui().library_view.current_id, '')).setIcon(
                QIcon.ic('fts.png'))

    if len(menu.actions()) > 0:
        menu.exec(ev.globalPos())
# }}}


def create_open_cover_with_menu(self, parent_menu):
    from calibre.gui2.open_with import edit_programs, populate_menu
    m = QMenu(_('Open cover with...'))

    def connect_action(ac, entry):
        connect_lambda(ac.triggered, self, lambda self: self.open_with(entry))

    populate_menu(m, connect_action, 'cover_image')
    if len(m.actions()) == 0:
        parent_menu.addAction(_('Open cover with...'), self.choose_open_with)
    else:
        m.addSeparator()
        m.addAction(_('Add another application to open cover with...'), self.choose_open_with)
        m.addAction(_('Edit Open with applications...'), partial(edit_programs, 'cover_image', self))
        parent_menu.ocw = m
        parent_menu.addMenu(m)
    return m


class CoverView(QWidget):  # {{{

    cover_changed = pyqtSignal(object, object)
    cover_removed = pyqtSignal(object)
    open_cover_with = pyqtSignal(object, object)
    search_internet = pyqtSignal(object)

    def __init__(self, vertical, parent=None):
        QWidget.__init__(self, parent)
        self._current_pixmap_size = QSize(120, 120)
        self.change_layout(vertical)

        self.animation = QPropertyAnimation(self, b'current_pixmap_size', self)
        self.animation.setEasingCurve(QEasingCurve(QEasingCurve.Type.OutExpo))
        self.animation.setDuration(1000)
        self.animation.setStartValue(QSize(0, 0))
        self.animation.valueChanged.connect(self.value_changed)

        self.default_pixmap = QApplication.instance().cached_qpixmap('default_cover.png', device_pixel_ratio=self.devicePixelRatio())
        self.pixmap = self.default_pixmap
        self.pwidth = self.pheight = None
        self.data = {}
        self.last_trim_id = self.last_trim_pixmap = None

        self.do_layout()

    def change_layout(self, vertical):
        self.vertical = vertical
        self.setSizePolicy(
                QSizePolicy.Policy.Expanding if vertical else QSizePolicy.Policy.Minimum,
                QSizePolicy.Policy.Expanding)

    def value_changed(self, val):
        self.update()

    def setCurrentPixmapSize(self, val):
        self._current_pixmap_size = val

    def minimumSizeHint(self):
        return QSize(100, 100)

    def do_layout(self):
        if self.rect().width() == 0 or self.rect().height() == 0:
            return
        pixmap = self.pixmap
        pwidth, pheight = pixmap.width(), pixmap.height()
        try:
            self.pwidth, self.pheight = fit_image(pwidth, pheight,
                            self.rect().width(), self.rect().height())[1:]
        except:
            self.pwidth, self.pheight = self.rect().width()-1, \
                    self.rect().height()-1
        self.current_pixmap_size = QSize(self.pwidth, self.pheight)
        self.animation.setEndValue(self.current_pixmap_size)

    def show_data(self, data):
        self.animation.stop()
        same_item = getattr(data, 'id', True) == self.data.get('id', False)
        self.data = {'id':data.get('id', None)}
        if data.cover_data[1]:
            self.pixmap = QPixmap.fromImage(data.cover_data[1])
            if self.pixmap.isNull() or self.pixmap.width() < 5 or \
                    self.pixmap.height() < 5:
                self.pixmap = self.default_pixmap
        else:
            self.pixmap = self.default_pixmap
        self.do_layout()
        self.update()
        if (not same_item and not config['disable_animations'] and
                self.isVisible()):
            self.animation.start()

    def paintEvent(self, event):
        canvas_size = self.rect()
        width = self.current_pixmap_size.width()
        extrax = canvas_size.width() - width
        if extrax < 0:
            extrax = 0
        x = int(extrax//2)
        height = self.current_pixmap_size.height()
        extray = canvas_size.height() - height
        if extray < 0:
            extray = 0
        y = int(extray//2)
        target = QRect(x, y, width, height)
        p = QPainter(self)
        p.setRenderHints(QPainter.RenderHint.Antialiasing | QPainter.RenderHint.SmoothPixmapTransform)
        try:
            dpr = self.devicePixelRatioF()
        except AttributeError:
            dpr = self.devicePixelRatio()
        spmap = self.pixmap.scaled(target.size() * dpr, Qt.AspectRatioMode.KeepAspectRatio, Qt.TransformationMode.SmoothTransformation)
        spmap.setDevicePixelRatio(dpr)
        with clip_border_radius(p, target):
            p.drawPixmap(target, spmap)
        if gprefs['bd_overlay_cover_size']:
            sztgt = target.adjusted(0, 0, 0, -4)
            f = p.font()
            f.setBold(True)
            p.setFont(f)
            sz = f'\xa0{self.pixmap.width()} x {self.pixmap.height()}\xa0'
            flags = Qt.AlignmentFlag.AlignBottom|Qt.AlignmentFlag.AlignRight|Qt.TextFlag.TextSingleLine
            szrect = p.boundingRect(sztgt, flags, sz)
            p.fillRect(szrect.adjusted(0, 0, 0, 4), QColor(0, 0, 0, 200))
            p.setPen(QPen(QColor(255,255,255)))
            p.drawText(sztgt, flags, sz)
        p.end()

    current_pixmap_size = pyqtProperty('QSize',
            fget=lambda self: self._current_pixmap_size,
            fset=setCurrentPixmapSize
            )

    def contextMenuEvent(self, ev):
        cm = QMenu(self)
        paste = cm.addAction(QIcon.ic('edit-paste.png'), _('Paste cover'))
        download = cm.addAction(QIcon.ic('download-metadata.png'), _('Download cover from internet'))
        copy = cm.addAction(QIcon.ic('edit-copy.png'), _('Copy cover'))
        save = cm.addAction(QIcon.ic('save.png'), _('Save cover to disk'))
        remove = cm.addAction(QIcon.ic('trash.png'), _('Remove cover'))
        gc = cm.addAction(QIcon.ic('default_cover.png'), _('Generate cover from metadata'))
        cm.addSeparator()
        if self.pixmap is not self.default_pixmap and self.data.get('id'):
            book_id = self.data['id']
            cm.tc = QMenu(_('Trim cover'))
            cm.tc.addAction(QIcon.ic('trim.png'), _('Automatically trim borders'), self.trim_cover)
            cm.tc.addAction(_('Trim borders manually'), self.manual_trim_cover)
            cm.tc.addSeparator()
            cm.tc.addAction(QIcon.ic('edit-undo.png'), _('Undo last trim'), self.undo_last_trim).setEnabled(self.last_trim_id == book_id)
            cm.addMenu(cm.tc)
            cm.addSeparator()
        if not QApplication.instance().clipboard().mimeData().hasImage():
            paste.setEnabled(False)
        copy.triggered.connect(self.copy_to_clipboard)
        paste.triggered.connect(self.paste_from_clipboard)
        remove.triggered.connect(self.remove_cover)
        download.triggered.connect(self.download_cover)
        gc.triggered.connect(self.generate_cover)
        save.triggered.connect(self.save_cover)
        create_open_cover_with_menu(self, cm)
        cm.si = m = create_search_internet_menu(self.search_internet.emit)
        cm.addMenu(m)
        cm.exec(ev.globalPos())

    def trim_cover(self):
        book_id = self.data.get('id')
        if not book_id:
            return
        from calibre.utils.img import remove_borders_from_image
        img = image_from_x(self.pixmap)
        nimg = remove_borders_from_image(img)
        if nimg is not img:
            self.last_trim_id = book_id
            self.last_trim_pixmap = self.pixmap
            self.update_cover(QPixmap.fromImage(nimg))

    def manual_trim_cover(self):
        book_id = self.data.get('id')
        if not book_id:
            return
        from calibre.gui2.dialogs.trim_image import TrimImage
        from calibre.utils.img import image_to_data
        cdata = image_to_data(image_from_x(self.pixmap), fmt='PNG', png_compression_level=1)
        d = TrimImage(cdata, parent=self)
        if d.exec() == QDialog.DialogCode.Accepted and d.image_data is not None:
            self.last_trim_id = book_id
            self.last_trim_pixmap = self.pixmap
            self.update_cover(cdata=d.image_data)

    def undo_last_trim(self):
        book_id = self.data.get('id')
        if not book_id or book_id != self.last_trim_id:
            return
        pmap = self.last_trim_pixmap
        self.last_trim_pixmap = self.last_trim_id = None
        self.update_cover(pmap)

    def open_with(self, entry):
        id_ = self.data.get('id', None)
        if id_ is not None:
            self.open_cover_with.emit(id_, entry)

    def choose_open_with(self):
        from calibre.gui2.open_with import choose_program
        entry = choose_program('cover_image', self)
        if entry is not None:
            self.open_with(entry)

    def copy_to_clipboard(self):
        QApplication.instance().clipboard().setPixmap(self.pixmap)

    def paste_from_clipboard(self, pmap=None):
        if not isinstance(pmap, QPixmap):
            cb = QApplication.instance().clipboard()
            pmap = cb.pixmap()
            if pmap.isNull() and cb.supportsSelection():
                pmap = cb.pixmap(QClipboard.Mode.Selection)
        if not pmap.isNull():
            self.update_cover(pmap)

    def download_cover(self):
        pmap = download_cover(self, self.data.get('id'), self.pixmap)
        if pmap is not None:
            self.update_cover(pmap)

    def save_cover(self):
        from calibre.gui2.ui import get_gui
        book_id = self.data.get('id')
        db = get_gui().current_db.new_api
        path = choose_save_file(
            self, 'save-cover-from-book-details', _('Choose cover save location'),
            filters=[(_('JPEG images'), ['jpg', 'jpeg'])], all_files=False,
            initial_filename='{}.jpeg'.format(sanitize_file_name(db.field_for('title', book_id, default_value='cover')))
        )
        if path:
            db.copy_cover_to(book_id, path)

    def update_cover(self, pmap=None, cdata=None):
        if pmap is None:
            pmap = QPixmap()
            pmap.loadFromData(cdata)
        if pmap.isNull():
            return
        if pmap.hasAlphaChannel():
            pmap = QPixmap.fromImage(blend_image(image_from_x(pmap)))
        self.pixmap = pmap
        self.do_layout()
        self.update()
        self.update_tooltip(getattr(self.parent(), 'current_path', ''))
        if not config['disable_animations']:
            self.animation.start()
        id_ = self.data.get('id', None)
        if id_ is not None:
            self.cover_changed.emit(id_, cdata or pixmap_to_data(pmap))

    def generate_cover(self, *args):
        book_id = self.data.get('id')
        if book_id is None:
            return
        from calibre.gui2.ui import get_gui
        mi = get_gui().current_db.new_api.get_metadata(book_id)
        if not mi.has_cover or confirm(
                _('Are you sure you want to replace the cover? The existing cover will be permanently lost.'), 'book_details_generate_cover'):
            from calibre.ebooks.covers import generate_cover
            cdata = generate_cover(mi)
            self.update_cover(cdata=cdata)

    def remove_cover(self):
        if not confirm_delete(
            _('Are you sure you want to delete the cover permanently?'),
                'book-details-confirm-cover-remove', parent=self):
            return
        id_ = self.data.get('id', None)
        self.pixmap = self.default_pixmap
        self.do_layout()
        self.update()
        if id_ is not None:
            self.cover_removed.emit(id_)

    def update_tooltip(self, current_path):
        try:
            sz = self.pixmap.size()
        except:
            sz = QSize(0, 0)
        self.setToolTip(
            '<p>'+_('Double click to open the Book details window') +
            '<br><br>' + _('Path') + ': ' + current_path +
            '<br><br>' + _('Cover size: %(width)d x %(height)d pixels')%dict(
                width=sz.width(), height=sz.height())
        )

    # }}}


# Book Info {{{

class BookInfo(HTMLDisplay):

    link_clicked = pyqtSignal(object)
    link_removal_requested = pyqtSignal(object, object)
    remove_format = pyqtSignal(int, object)
    remove_item = pyqtSignal(int, object, object)
    save_format = pyqtSignal(int, object)
    restore_format = pyqtSignal(int, object)
    compare_format = pyqtSignal(int, object)
    set_cover_format = pyqtSignal(int, object)
    copy_link = pyqtSignal(object)
    manage_category = pyqtSignal(object, object)
    open_fmt_with = pyqtSignal(int, object, object)
    edit_book = pyqtSignal(int, object)
    edit_identifiers = pyqtSignal()
    find_in_tag_browser = pyqtSignal(object, object)
    notes_resource_scheme = RESOURCE_URL_SCHEME

    def __init__(self, vertical, parent=None):
        HTMLDisplay.__init__(self, parent=parent, save_resources_in_document=False)
        self.vertical = vertical
        self.last_rendered_html = '', '', ''
        self.base_url_for_current_book = None
        self.anchor_clicked.connect(self.link_activated)
        for x, icon in [
            ('remove_format', 'trash.png'), ('save_format', 'save.png'),
            ('restore_format', 'edit-undo.png'), ('copy_link','edit-copy.png'),
            ('compare_format', 'diff.png'),
            ('set_cover_format', 'default_cover.png'),
            ('find_in_tag_browser', 'search.png')
        ]:
            ac = QAction(QIcon.ic(icon), '', self)
            ac.current_fmt = None
            ac.current_url = None
            ac.triggered.connect(getattr(self, f'{x}_triggerred'))
            setattr(self, f'{x}_action', ac)
        self.manage_action = QAction(self)
        self.manage_action.current_fmt = self.manage_action.current_url = None
        self.manage_action.triggered.connect(self.manage_action_triggered)
        self.edit_identifiers_action = QAction(QIcon.ic('identifiers.png'), _('Edit identifiers for this book'), self)
        self.edit_identifiers_action.triggered.connect(self.edit_identifiers)
        self.remove_item_action = ac = QAction(QIcon.ic('minus.png'), '...', self)
        ac.data = (None, None, None)
        ac.triggered.connect(self.remove_item_triggered)
        self.copy_identifiers_url_action = ac = QAction(QIcon.ic('edit-copy.png'), _('Identifier &URL'), self)
        ac.triggered.connect(self.copy_id_url_triggerred)
        ac.current_url = ac.current_fmt = None
        self.setFocusPolicy(Qt.FocusPolicy.NoFocus)
        self.setDefaultStyleSheet(css())
        if iswindows and not QApplication.instance().using_calibre_style:
            # workaround Qt bug that causes selected text to be invisible on
            # windows when using system theme
            bg = self.palette().color(QPalette.ColorRole.Highlight).name()
            fg = self.palette().color(QPalette.ColorRole.HighlightedText).name()
            self.setStyleSheet(f'QTextBrowser {{ selection-color: {fg}; selection-background-color: {bg}; }}')

    def change_layout(self, vertical):
        if vertical != self.vertical:
            self.vertical = vertical
            if self.last_rendered_html[0]:
                html = render_parts(self.last_rendered_html[1], self.last_rendered_html[2], self.vertical)
                self.last_rendered_html = html, self.last_rendered_html[1], self.last_rendered_html[2]
                self.setHtml(html)

    def refresh_css(self):
        self.setDefaultStyleSheet(css(True))

    def remove_item_triggered(self):
        field, value, book_id = self.remove_item_action.data
        if field and confirm(_('Are you sure you want to delete <b>{}</b> from the book?').format(value), 'book_details_remove_item'):
            self.remove_item.emit(book_id, field, value)

    def context_action_triggered(self, which):
        f = getattr(self, f'{which}_action').current_fmt
        url = getattr(self, f'{which}_action').current_url
        if f and 'format' in which:
            book_id, fmt = f
            getattr(self, which).emit(book_id, fmt)
        if url and 'link' in which:
            getattr(self, which).emit(url)

    def remove_format_triggerred(self):
        self.context_action_triggered('remove_format')

    def save_format_triggerred(self):
        self.context_action_triggered('save_format')

    def restore_format_triggerred(self):
        self.context_action_triggered('restore_format')

    def compare_format_triggerred(self):
        self.context_action_triggered('compare_format')

    def set_cover_format_triggerred(self):
        self.context_action_triggered('set_cover_format')

    def copy_link_triggerred(self):
        self.context_action_triggered('copy_link')

    def copy_id_url_triggerred(self):
        if self.copy_identifiers_url_action.current_url:
            self.copy_link.emit(self.copy_identifiers_url_action.current_url)

    def find_in_tag_browser_triggerred(self):
        if self.find_in_tag_browser_action.current_fmt:
            self.find_in_tag_browser.emit(*self.find_in_tag_browser_action.current_fmt)

    def manage_action_triggered(self):
        if self.manage_action.current_fmt:
            self.manage_category.emit(*self.manage_action.current_fmt)

    def link_activated(self, link):
        if str(link.scheme()) in ('http', 'https'):
            return safe_open_url(link)
        link = str(link.toString(NO_URL_FORMATTING))
        self.link_clicked.emit(link)

    def show_data(self, mi):
        html, table, comments = self.last_rendered_html = render_html(mi, self.vertical, self.parent())
        path = getattr(mi, 'path', None)
        self.base_url_for_current_book = QUrl.fromLocalFile(os.path.join(path, 'metadata.opf')) if path else None
        set_html(mi, html, self)

    def get_base_qurl(self):
        return self.base_url_for_current_book

    def process_external_css(self, css):
        return resolve_colors(css)

    def mouseDoubleClickEvent(self, ev):
        v = self.viewport()
        if v.rect().contains(self.mapFromGlobal(ev.globalPos())):
            ev.ignore()
        else:
            return HTMLDisplay.mouseDoubleClickEvent(self, ev)

    def contextMenuEvent(self, ev):
        details_context_menu_event(self, ev, self, True)

    def open_with(self, book_id, fmt, entry):
        self.open_fmt_with.emit(book_id, fmt, entry)

    def choose_open_with(self, book_id, fmt):
        from calibre.gui2.open_with import choose_program
        entry = choose_program(fmt, self)
        if entry is not None:
            self.open_with(book_id, fmt, entry)

    def edit_fmt(self, book_id, fmt):
        self.edit_book.emit(book_id, fmt)

    def reindex_fmt(self, book_id, fmt):
        from calibre.gui2.ui import get_gui
        db = get_gui().current_db.new_api
        if fmt:
            db.reindex_fts_book(book_id, fmt)
        else:
            db.reindex_fts_book(book_id)
# }}}


class DetailsLayout(QSplitter):  # {{{

    def __init__(self, vertical, parent):
        orientation = Qt.Orientation.Vertical if vertical else Qt.Orientation.Horizontal
        super().__init__(orientation, parent)
        self.vertical = vertical
        self._children = []
        self.setContentsMargins(0, 0, 0, 0)
        self.splitterMoved.connect(self.do_splitter_moved,
                                   type=Qt.ConnectionType.QueuedConnection)
        self.resize_timer = QTimer()
        self.resize_timer.setSingleShot(True)
        self.resize_timer.setInterval(5)
        self.resize_timer.timeout.connect(self.do_resize)

    def change_layout(self, vertical):
        self.vertical = vertical
        self.restore_splitter_state()

    def do_resize(self, *args):
        super().resizeEvent(self._resize_ev)
        self.do_layout(self.rect())

    def resizeEvent(self, ev):
        if self.resize_timer.isActive():
            self.resize_timer.stop()
        self._resize_ev = ev
        self.resize_timer.start()

    def minimumSize(self):
        return QSize(190, 200) if self.vertical else QSize(120, 120)

    def addWidget(self, child):
        if len(self._children) > 2:
            raise ValueError('This layout can only manage two children')
        self._children.append(child)

    def count(self):
        return len(self._children)

    def sizeHint(self):
        return self.minimumSize()

    @property
    def splitter_state_pref_name(self):
        return 'book_details_widget_splitter_state_' + ('vertical' if self.vertical else 'horizontal')

    def restore_splitter_state(self):
        s = gprefs.get(self.splitter_state_pref_name)
        if s is None:
            s = gprefs.get('book_details_widget_splitter_state')
        if s is None:
            # Without this on first start the splitter is rendered over the cover
            self.setSizes([20, 80])
        else:
            self.restoreState(s)
        self.setOrientation(Qt.Orientation.Vertical if self.vertical else Qt.Orientation.Horizontal)

    def setGeometry(self, *a):
        super().setGeometry(*a)
        self.do_layout(self.geometry())

    def do_splitter_moved(self, *args):
        gprefs[self.splitter_state_pref_name] = bytearray(self.saveState())
        self._children[0].do_layout()

    def cover_height(self, r):
        if not self._children[0].isVisible():
            return 0
        mh = min(int(r.height()//2), int(4/3 * r.width())+1)
        try:
            ph = self._children[0].pixmap.height()
        except:
            ph = 0
        if ph > 0:
            mh = min(mh, ph)
        return mh

    def cover_width(self, r):
        if not self._children[0].isVisible():
            return 0
        mw = 1 + int(3/4 * r.height())
        try:
            pw = self._children[0].pixmap.width()
        except:
            pw = 0
        if pw > 0:
            mw = min(mw, pw)
        return mw

    def do_layout(self, rect):
        if len(self._children) != 2:
            return
        cm = self.contentsMargins()
        left = cm.left()
        top = cm.top()
        right = cm.right()
        bottom = cm.top()
        r = rect.adjusted(+left, +top, -right, -bottom)
        x = r.x()
        y = r.y()
        cover, details = self._children
        if self.vertical:
            ch = self.cover_height(r)
            cover.setGeometry(QRect(x, y, r.width(), ch))
            y += ch + 5
            details.setGeometry(QRect(x, y, r.width(), r.height()-ch-5))
        else:
            cw = self.cover_width(r)
            cover.setGeometry(QRect(x, y, cw, r.height()))
            x += cw + 5
            details.setGeometry(QRect(x, y, r.width() - cw - 5, r.height()))
        self.restore_splitter_state()  # only required on first call to do_layout, but ...
        cover.do_layout()
# }}}


# Drag 'n drop {{{

class DropMixin:
    files_dropped = pyqtSignal(object, object)
    remote_file_dropped = pyqtSignal(object, object)

    def __init__(self):
        self.setAcceptDrops(True)

    def dragEnterEvent(self, event):
        md = event.mimeData()
        if dnd_has_extension(md, image_extensions() + BOOK_EXTENSIONS, allow_all_extensions=True, allow_remote=True) or \
                dnd_has_image(md):
            event.acceptProposedAction()

    def dropEvent(self, event):
        event.setDropAction(Qt.DropAction.CopyAction)
        md = event.mimeData()

        image_exts = set(image_extensions()) - set(tweaks['cover_drop_exclude'])
        x, y = dnd_get_image(md, image_exts)
        if x is not None:
            # We have an image, set cover
            event.accept()
            if y is None:
                # Local image
                self.cover_view.paste_from_clipboard(x)
                self.update_layout()
            else:
                self.remote_file_dropped.emit(x, y)
                # We do not support setting cover *and* adding formats for
                # a remote drop, anyway, so return
                return

        # Now look for ebook files
        urls, filenames = dnd_get_files(md, BOOK_EXTENSIONS, allow_all_extensions=True, filter_exts=image_exts)
        if not urls:
            # Nothing found
            return

        if not filenames:
            # Local files
            self.files_dropped.emit(event, urls)
        else:
            # Remote files, use the first file
            self.remote_file_dropped.emit(urls[0], filenames[0])
        event.accept()

    def dragMoveEvent(self, event):
        event.acceptProposedAction()

    # }}}


class BookDetails(DetailsLayout, DropMixin):  # {{{

    show_book_info = pyqtSignal()
    open_containing_folder = pyqtSignal(int)
    open_data_folder = pyqtSignal(int)
    view_specific_format = pyqtSignal(int, object)
    search_requested = pyqtSignal(object, object)
    remove_specific_format = pyqtSignal(int, object)
    remove_metadata_item = pyqtSignal(int, object, object)
    save_specific_format = pyqtSignal(int, object)
    restore_specific_format = pyqtSignal(int, object)
    set_cover_from_format = pyqtSignal(int, object)
    compare_specific_format = pyqtSignal(int, object)
    copy_link = pyqtSignal(object)
    cover_changed = pyqtSignal(object, object)
    open_cover_with = pyqtSignal(object, object)
    cover_removed = pyqtSignal(object)
    view_device_book = pyqtSignal(object)
    manage_category = pyqtSignal(object, object)
    edit_identifiers = pyqtSignal()
    open_fmt_with = pyqtSignal(int, object, object)
    edit_book = pyqtSignal(int, object)
    find_in_tag_browser = pyqtSignal(object, object)

    def __init__(self, vertical, parent=None):
        super().__init__(vertical, parent)
        DropMixin.__init__(self)
        self.last_data = {}
        self._layout = self
        self.current_path = ''

        self.cover_view = CoverView(vertical, self)
        self.cover_view.search_internet.connect(self.search_internet)
        self.cover_view.cover_changed.connect(self.cover_changed.emit)
        self.cover_view.open_cover_with.connect(self.open_cover_with.emit)
        self.cover_view.cover_removed.connect(self.cover_removed.emit)
        self._layout.addWidget(self.cover_view)
        self.book_info = BookInfo(vertical, self)
        self.book_info.show_book_info = self.show_book_info
        self.book_info.search_internet = self.search_internet
        self.book_info.search_requested = self.search_requested.emit
        self._layout.addWidget(self.book_info)
        self.book_info.link_clicked.connect(self.handle_click)
        self.book_info.link_removal_requested.connect(self.remove_link)
        self.book_info.remove_format.connect(self.remove_specific_format)
        self.book_info.remove_item.connect(self.remove_metadata_item)
        self.book_info.open_fmt_with.connect(self.open_fmt_with)
        self.book_info.edit_book.connect(self.edit_book)
        self.book_info.save_format.connect(self.save_specific_format)
        self.book_info.restore_format.connect(self.restore_specific_format)
        self.book_info.set_cover_format.connect(self.set_cover_from_format)
        self.book_info.compare_format.connect(self.compare_specific_format)
        self.book_info.copy_link.connect(self.copy_link)
        self.book_info.manage_category.connect(self.manage_category)
        self.book_info.find_in_tag_browser.connect(self.find_in_tag_browser)
        self.book_info.edit_identifiers.connect(self.edit_identifiers)
        self.setCursor(Qt.CursorShape.PointingHandCursor)

    def change_layout(self, vertical):
        if vertical != self.vertical:
            super().change_layout(vertical)
            self.cover_view.change_layout(vertical)
            self.book_info.change_layout(vertical)
            self.do_layout(self.rect())

    def search_internet(self, data):
        if self.last_data:
            if data.author is None:
                url = url_for_book_search(data.where, title=self.last_data['title'], author=self.last_data['authors'][0])
            else:
                url = url_for_author_search(data.where, author=data.author)
            safe_open_url(url)

    def handle_click_from_popup(self, link, parent=None):
        parent = parent or self
        typ, val = link.partition(':')[::2]
        from calibre.gui2.ui import get_gui
        db = get_gui().current_db.new_api

        def search_term(field, val):
            append = ''
            mods = QApplication.instance().keyboardModifiers()
            if mods & Qt.KeyboardModifier.ControlModifier:
                append = 'AND' if mods & Qt.KeyboardModifier.ShiftModifier else 'OR'

            fmt = '{}:{}' if is_boolean(field) else '{}:"={}"'
            self.search_requested.emit(
                fmt.format(field, val.replace('"', '\\"')),
                append
            )

        def browse(url):
            if url.startswith(DATA_DIR_NAME + '/') and self.last_data.get('book_id'):
                base = get_gui().current_db.abspath(self.last_data['book_id'], index_is_id=True)
                path = os.path.join(base, url)
                qurl = QUrl.fromLocalFile(path)
            else:
                qurl = QUrl(url, QUrl.ParsingMode.TolerantMode)
            try:
                safe_open_url(qurl)
            except Exception:
                import traceback
                traceback.print_exc()

        if typ == 'action':
            data = json_loads(from_hex_bytes(val))
            dt = data['type']
            if dt == 'search':
                field = data.get('field')
                search_term(data['term'], data['value'])
            elif dt == 'cc_url':
                if data['url']:
                    browse(data['url'])
            elif dt == 'author':
                url = data['url']
                if url == 'calibre':
                    search_term('authors', data['name'])
                else:
                    browse(url)
            elif dt == 'format':
                book_id, fmt = data['book_id'], data['fmt']
                self.view_specific_format.emit(int(book_id), fmt)
            elif dt == 'identifier':
                if data['url']:
                    browse(data['url'])
            elif dt == 'path':
                self.open_containing_folder.emit(int(data['loc']))
            elif dt == 'data-path':
                self.open_data_folder.emit(int(data['loc']))
            elif dt == 'devpath':
                self.view_device_book.emit(data['loc'])
        elif typ == 'notes':
            data = json_loads(from_hex_bytes(val))
            field = data.get('field')
            # It shouldn't be possible for the field to be invalid or the
            # note not to exist, but ...
            if field and db.field_supports_notes(field):
                item_id = data['item_id']
                if item_id is not None and db.notes_for(field, item_id):
                    return self.show_notes(field, item_id, parent)
        else:
            browse(link)

    def handle_click(self, link):
        self.handle_click_from_popup(link)

    def remove_link(self, field, item_value):
        from calibre.gui2.ui import get_gui
        gui = get_gui()
        db = gui.current_db.new_api
        db.set_link_map(field, {item_value: ''})
        m = gui.library_view.model()
        current = gui.library_view.currentIndex()
        m.current_changed(current, current)
        gui.tags_view.recount()

    def show_notes(self, field, item_id, parent=None):
        from calibre.gui2.dialogs.show_category_note import ShowNoteDialog
        from calibre.gui2.ui import get_gui
        ShowNoteDialog(field, item_id, get_gui().current_db.new_api, parent=parent or self).show()

    def mouseDoubleClickEvent(self, ev):
        ev.accept()
        self.show_book_info.emit()

    def show_data(self, data):
        try:
            self.last_data = {'title':data.title, 'authors':data.authors, 'book_id': getattr(data, 'id', None)}
        except Exception:
            self.last_data = {}
        self.book_info.show_data(data)
        self.cover_view.show_data(data)
        self.current_path = getattr(data, 'path', '')
        self.update_layout()

    def update_layout(self):
        self.cover_view.setVisible(gprefs['bd_show_cover'])
        self._layout.do_layout(self.rect())
        self.cover_view.update_tooltip(self.current_path)

    def reset_info(self):
        self.show_data(Metadata(_('Unknown')))

# }}}
