# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####

# <pep8 compliant>

if "bpy" in locals():
    import importlib
    importlib.reload(settings)
    importlib.reload(utils_i18n)
    importlib.reload(bl_extract_messages)
else:
    import bpy
    from bpy.types import Operator
    from bpy.props import (
        BoolProperty,
        EnumProperty,
        StringProperty,
    )
    from . import settings
    from bl_i18n_utils import utils as utils_i18n
    from bl_i18n_utils import bl_extract_messages

from bpy.app.translations import pgettext_iface as iface_
import addon_utils

import io
import os
import shutil
import subprocess
import tempfile


# Helpers ###################################################################

def validate_module(op, context):
    module_name = op.module_name
    addon = getattr(context, "active_addon", None)
    if addon:
        module_name = addon.module

    if not module_name:
        op.report({'ERROR'}, "No add-on module given!")
        return None, None

    mod = utils_i18n.enable_addons(addons={module_name}, check_only=True)
    if not mod:
        op.report({'ERROR'}, "Add-on '{}' not found!".format(module_name))
        return None, None
    return module_name, mod[0]


# As it's a bit time heavy, I'd like to cache that enum, but this does not seem easy to do! :/
# That "self" is not the same thing as the "self" that operators get in their invoke/execute/etc. funcs... :(
_cached_enum_addons = []
def enum_addons(self, context):
    global _cached_enum_addons
    setts = getattr(self, "settings", settings.settings)
    if not _cached_enum_addons:
        for mod in addon_utils.modules(addon_utils.addons_fake_modules):
            mod_info = addon_utils.module_bl_info(mod)
            # Skip OFFICIAL addons, they are already translated in main i18n system (together with Blender itself).
            if mod_info["support"] in {'OFFICIAL'}:
                continue
            src = mod.__file__
            if src.endswith("__init__.py"):
                src = os.path.dirname(src)
            has_translation, _ = utils_i18n.I18n.check_py_module_has_translations(src, setts)
            name = mod_info["name"]
            if has_translation:
                name = name + " *"
            _cached_enum_addons.append((mod.__name__, name, mod_info["description"]))
        _cached_enum_addons.sort(key=lambda i: i[1])
    return _cached_enum_addons


# Operators ###################################################################

# This one is a helper one, as we sometimes need another invoke function (like e.g. file selection)...
class UI_OT_i18n_addon_translation_invoke(Operator):
    """Wrapper operator which will invoke given op after setting its module_name"""
    bl_idname = "ui.i18n_addon_translation_invoke"
    bl_label = "Update I18n Add-on"
    bl_property = "module_name"

    # Operator Arguments
    module_name: EnumProperty(
        name="Add-on",
        description="Add-on to process",
        items=enum_addons,
        options=set(),
    )
    op_id: StringProperty(
        name="Operator Name",
        description="Name (id) of the operator to invoke",
    )
    # /End Operator Arguments

    def invoke(self, context, event):
        global _cached_enum_addons
        _cached_enum_addons[:] = []
        context.window_manager.invoke_search_popup(self)
        return {'RUNNING_MODAL'}

    def execute(self, context):
        global _cached_enum_addons
        _cached_enum_addons[:] = []
        if not self.op_id:
            return {'CANCELLED'}
        op = bpy.ops
        for item in self.op_id.split('.'):
            op = getattr(op, item, None)
            if op is None:
                return {'CANCELLED'}
        return op('INVOKE_DEFAULT', module_name=self.module_name)


class UI_OT_i18n_addon_translation_update(Operator):
    """Update given add-on's translation data (found as a py tuple in the add-on's source code)"""
    bl_idname = "ui.i18n_addon_translation_update"
    bl_label = "Update I18n Add-on"

    # Operator Arguments
    module_name: EnumProperty(
        name="Add-on",
        description="Add-on to process",
        items=enum_addons,
        options=set()
    )
    # /End Operator Arguments

    def execute(self, context):
        global _cached_enum_addons
        _cached_enum_addons[:] = []
        if not hasattr(self, "settings"):
            self.settings = settings.settings
        i18n_sett = context.window_manager.i18n_update_svn_settings

        module_name, mod = validate_module(self, context)

        # Generate addon-specific messages (no need for another blender instance here, this should not have any
        # influence over the final result).
        pot = bl_extract_messages.dump_addon_messages(module_name, True, self.settings)

        # Now (try to) get current i18n data from the addon...
        path = mod.__file__
        if path.endswith("__init__.py"):
            path = os.path.dirname(path)

        trans = utils_i18n.I18n(kind='PY', src=path, settings=self.settings)

        uids = set()
        for lng in i18n_sett.langs:
            if lng.uid in self.settings.IMPORT_LANGUAGES_SKIP:
                print("Skipping {} language ({}), edit settings if you want to enable it.".format(lng.name, lng.uid))
                continue
            if not lng.use:
                print("Skipping {} language ({}).".format(lng.name, lng.uid))
                continue
            uids.add(lng.uid)
        # For now, add to processed uids all those not found in "official" list, minus "tech" ones.
        uids |= (trans.trans.keys() - {lng.uid for lng in i18n_sett.langs} -
                                      {self.settings.PARSER_TEMPLATE_ID, self.settings.PARSER_PY_ID})

        # And merge!
        for uid in uids:
            if uid not in trans.trans:
                trans.trans[uid] = utils_i18n.I18nMessages(uid=uid, settings=self.settings)
            trans.trans[uid].update(pot, keep_old_commented=False)
        trans.trans[self.settings.PARSER_TEMPLATE_ID] = pot

        # For now we write all languages found in this trans!
        trans.write(kind='PY')

        return {'FINISHED'}


class UI_OT_i18n_addon_translation_import(Operator):
    """Import given add-on's translation data from PO files"""
    bl_idname = "ui.i18n_addon_translation_import"
    bl_label = "I18n Add-on Import"

    # Operator Arguments
    module_name: EnumProperty(
        name="Add-on",
        description="Add-on to process", options=set(),
        items=enum_addons,
    )

    directory: StringProperty(
        subtype='FILE_PATH', maxlen=1024,
        options={'HIDDEN', 'SKIP_SAVE'}
    )
    # /End Operator Arguments

    def _dst(self, trans, path, uid, kind):
        if kind == 'PO':
            if uid == self.settings.PARSER_TEMPLATE_ID:
                return os.path.join(self.directory, "blender.pot")
            path = os.path.join(self.directory, uid)
            if os.path.isdir(path):
                return os.path.join(path, uid + ".po")
            return path + ".po"
        elif kind == 'PY':
            return trans._dst(trans, path, uid, kind)
        return path

    def invoke(self, context, event):
        global _cached_enum_addons
        _cached_enum_addons[:] = []
        if not hasattr(self, "settings"):
            self.settings = settings.settings
        module_name, mod = validate_module(self, context)
        if mod:
            self.directory = os.path.dirname(mod.__file__)
            self.module_name = module_name
        context.window_manager.fileselect_add(self)
        return {'RUNNING_MODAL'}

    def execute(self, context):
        global _cached_enum_addons
        _cached_enum_addons[:] = []
        if not hasattr(self, "settings"):
            self.settings = settings.settings
        i18n_sett = context.window_manager.i18n_update_svn_settings

        module_name, mod = validate_module(self, context)
        if not (module_name and mod):
            return {'CANCELLED'}

        path = mod.__file__
        if path.endswith("__init__.py"):
            path = os.path.dirname(path)

        trans = utils_i18n.I18n(kind='PY', src=path, settings=self.settings)

        # Now search given dir, to find po's matching given languages...
        # Mapping po_uid: po_file.
        po_files = dict(utils_i18n.get_po_files_from_dir(self.directory))

        # Note: uids in i18n_sett.langs and addon's py code should be the same (both taken from the locale's languages
        #       file). So we just try to find the best match in po's for each enabled uid.
        for lng in i18n_sett.langs:
            if lng.uid in self.settings.IMPORT_LANGUAGES_SKIP:
                print("Skipping {} language ({}), edit settings if you want to enable it.".format(lng.name, lng.uid))
                continue
            if not lng.use:
                print("Skipping {} language ({}).".format(lng.name, lng.uid))
                continue
            uid = lng.uid
            po_uid = utils_i18n.find_best_isocode_matches(uid, po_files.keys())
            if not po_uid:
                print("Skipping {} language, no PO file found for it ({}).".format(lng.name, uid))
                continue
            po_uid = po_uid[0]
            msgs = utils_i18n.I18nMessages(uid=uid, kind='PO', key=uid, src=po_files[po_uid], settings=self.settings)
            if uid in trans.trans:
                trans.trans[uid].merge(msgs, replace=True)
            else:
                trans.trans[uid] = msgs

        trans.write(kind='PY')

        return {'FINISHED'}


class UI_OT_i18n_addon_translation_export(Operator):
    """Export given add-on's translation data as PO files"""

    bl_idname = "ui.i18n_addon_translation_export"
    bl_label = "I18n Add-on Export"

    # Operator Arguments
    module_name: EnumProperty(
        name="Add-on",
        description="Add-on to process",
        items=enum_addons,
        options=set()
    )

    use_export_pot: BoolProperty(
        name="Export POT",
        description="Export (generate) a POT file too",
        default=True,
    )

    use_update_existing: BoolProperty(
        name="Update Existing",
        description="Update existing po files, if any, instead of overwriting them",
        default=True,
    )

    directory: StringProperty(
        subtype='FILE_PATH', maxlen=1024,
        options={'HIDDEN', 'SKIP_SAVE'}
    )
    # /End Operator Arguments

    def _dst(self, trans, path, uid, kind):
        if kind == 'PO':
            if uid == self.settings.PARSER_TEMPLATE_ID:
                return os.path.join(self.directory, "blender.pot")
            path = os.path.join(self.directory, uid)
            if os.path.isdir(path):
                return os.path.join(path, uid + ".po")
            return path + ".po"
        elif kind == 'PY':
            return trans._dst(trans, path, uid, kind)
        return path

    def invoke(self, context, event):
        global _cached_enum_addons
        _cached_enum_addons[:] = []
        if not hasattr(self, "settings"):
            self.settings = settings.settings
        module_name, mod = validate_module(self, context)
        if mod:
            self.directory = os.path.dirname(mod.__file__)
            self.module_name = module_name
        context.window_manager.fileselect_add(self)
        return {'RUNNING_MODAL'}

    def execute(self, context):
        global _cached_enum_addons
        _cached_enum_addons[:] = []
        if not hasattr(self, "settings"):
            self.settings = settings.settings
        i18n_sett = context.window_manager.i18n_update_svn_settings

        module_name, mod = validate_module(self, context)
        if not (module_name and mod):
            return {'CANCELLED'}

        path = mod.__file__
        if path.endswith("__init__.py"):
            path = os.path.dirname(path)

        trans = utils_i18n.I18n(kind='PY', src=path, settings=self.settings)
        trans.dst = self._dst

        uids = [self.settings.PARSER_TEMPLATE_ID] if self.use_export_pot else []
        for lng in i18n_sett.langs:
            if lng.uid in self.settings.IMPORT_LANGUAGES_SKIP:
                print("Skipping {} language ({}), edit settings if you want to enable it.".format(lng.name, lng.uid))
                continue
            if not lng.use:
                print("Skipping {} language ({}).".format(lng.name, lng.uid))
                continue
            uid = utils_i18n.find_best_isocode_matches(lng.uid, trans.trans.keys())
            if uid:
                uids.append(uid[0])

        # Try to update existing POs instead of overwriting them, if asked to do so!
        if self.use_update_existing:
            for uid in uids:
                if uid == self.settings.PARSER_TEMPLATE_ID:
                    continue
                path = trans.dst(trans, trans.src[uid], uid, 'PO')
                if not os.path.isfile(path):
                    continue
                msgs = utils_i18n.I18nMessages(kind='PO', src=path, settings=self.settings)
                msgs.update(trans.msgs[self.settings.PARSER_TEMPLATE_ID])
                trans.msgs[uid] = msgs

        trans.write(kind='PO', langs=set(uids))

        return {'FINISHED'}


classes = (
    UI_OT_i18n_addon_translation_invoke,
    UI_OT_i18n_addon_translation_update,
    UI_OT_i18n_addon_translation_import,
    UI_OT_i18n_addon_translation_export,
)
