# -*- coding: utf-8 -*-

# Copyright © 2012-2020 Roberto Alsina and others.

# Permission is hereby granted, free of charge, to any
# person obtaining a copy of this software and associated
# documentation files (the "Software"), to deal in the
# Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the
# Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice
# shall be included in all copies or substantial portions of
# the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

"""Manage plugins."""

import io
import json.decoder
import os
import sys
import shutil
import subprocess
import time
import requests

import pygments
from pygments.lexers import PythonLexer
from pygments.formatters import TerminalFormatter

from nikola.plugin_categories import Command
from nikola import utils

LOGGER = utils.get_logger('plugin')


class CommandPlugin(Command):
    """Manage plugins."""

    json = None
    name = "plugin"
    doc_usage = "[-u url] [--user] [-i name] [-r name] [--upgrade] [-l] [--list-installed]"
    doc_purpose = "manage plugins"
    output_dir = None
    needs_config = False
    cmd_options = [
        {
            'name': 'install',
            'short': 'i',
            'long': 'install',
            'type': str,
            'default': '',
            'help': 'Install a plugin.',
        },
        {
            'name': 'uninstall',
            'long': 'uninstall',
            'short': 'r',
            'type': str,
            'default': '',
            'help': 'Uninstall a plugin.'
        },
        {
            'name': 'list',
            'short': 'l',
            'long': 'list',
            'type': bool,
            'default': False,
            'help': 'Show list of available plugins.'
        },
        {
            'name': 'url',
            'short': 'u',
            'long': 'url',
            'type': str,
            'help': "URL for the plugin repository (default: "
                    "https://plugins.getnikola.com/v8/plugins.json)",
            'default': 'https://plugins.getnikola.com/v8/plugins.json'
        },
        {
            'name': 'user',
            'long': 'user',
            'type': bool,
            'help': "Install user-wide, available for all sites.",
            'default': False
        },
        {
            'name': 'upgrade',
            'long': 'upgrade',
            'type': bool,
            'help': "Upgrade all installed plugins.",
            'default': False
        },
        {
            'name': 'list_installed',
            'long': 'list-installed',
            'type': bool,
            'help': "List the installed plugins with their location.",
            'default': False
        },
    ]

    def _execute(self, options, args):
        """Install plugin into current site."""
        url = options['url']
        user_mode = options['user']

        # See the "mode" we need to operate in
        install = options.get('install')
        uninstall = options.get('uninstall')
        upgrade = options.get('upgrade')
        list_available = options.get('list')
        list_installed = options.get('list_installed')
        show_install_notes = options.get('show_install_notes', True)
        command_count = [bool(x) for x in (
            install,
            uninstall,
            upgrade,
            list_available,
            list_installed)].count(True)
        if command_count > 1 or command_count == 0:
            print(self.help())
            return 2

        if options.get('output_dir') is not None:
            self.output_dir = options.get('output_dir')
        else:
            if not self.site.configured and not user_mode and install:
                LOGGER.warning('No site found, assuming --user')
                user_mode = True

            if user_mode:
                self.output_dir = os.path.expanduser('~/.nikola/plugins')
            else:
                self.output_dir = 'plugins'

        if list_available:
            return self.list_available(url)
        elif list_installed:
            return self.list_installed()
        elif upgrade:
            return self.do_upgrade(url)
        elif uninstall:
            return self.do_uninstall(uninstall)
        elif install:
            return self.do_install(url, install, show_install_notes)

    def list_available(self, url):
        """List all available plugins."""
        data = self.get_json(url)
        print("Available Plugins:")
        print("------------------")
        for plugin in sorted(data.keys()):
            print(plugin)
        return 0

    def list_installed(self):
        """List installed plugins."""
        plugins = []
        for plugin in self.site.plugin_manager.getAllPlugins():
            p = plugin.path
            if os.path.isdir(p):
                p = p + os.sep
            else:
                p = p + '.py'
            plugins.append([plugin.name, p])

        plugins.sort()
        print('Installed Plugins:')
        print('------------------')
        maxlength = max(len(i[0]) for i in plugins)
        if self.site.colorful:
            formatstring = '\x1b[1m{0:<{2}}\x1b[0m  at {1}'
        else:
            formatstring = '{0:<{2}}  at {1}'
        for name, path in plugins:
            print(formatstring.format(name, path, maxlength))
        dp = self.site.config['DISABLED_PLUGINS']
        if dp:
            print('\n\nAlso, you have disabled these plugins: {}'.format(', '.join(dp)))
        else:
            print('\n\nNo plugins are disabled.')
        return 0

    def do_upgrade(self, url):
        """Upgrade all installed plugins."""
        LOGGER.warning('This is not very smart, it just reinstalls some plugins and hopes for the best')
        data = self.get_json(url)
        plugins = []
        for plugin in self.site.plugin_manager.getAllPlugins():
            p = plugin.path
            if os.path.isdir(p):
                p = p + os.sep
            else:
                p = p + '.py'
            if plugin.name in data:
                plugins.append([plugin.name, p])
        print('Will upgrade {0} plugins: {1}'.format(len(plugins), ', '.join(n for n, _ in plugins)))
        for name, path in plugins:
            print('Upgrading {0}'.format(name))
            p = path
            while True:
                tail, head = os.path.split(path)
                if head == 'plugins':
                    self.output_dir = path
                    break
                elif tail == '':
                    LOGGER.error("Can't find the plugins folder for path: {0}".format(p))
                    return 1
                else:
                    path = tail
            self.do_install(url, name)
        return 0

    def do_install(self, url, name, show_install_notes=True):
        """Download and install a plugin."""
        data = self.get_json(url)
        if name in data:
            utils.makedirs(self.output_dir)
            url = data[name]
            LOGGER.info("Downloading '{0}'".format(url))
            try:
                zip_data = requests.get(url).content
            except requests.exceptions.SSLError:
                LOGGER.warning("SSL error, using http instead of https (press ^C to abort)")
                time.sleep(1)
                url = url.replace('https', 'http', 1)
                zip_data = requests.get(url).content

            zip_file = io.BytesIO()
            zip_file.write(zip_data)
            LOGGER.info('Extracting: {0} into {1}/'.format(name, self.output_dir))
            utils.extract_all(zip_file, self.output_dir)
            dest_path = os.path.join(self.output_dir, name)
        else:
            LOGGER.error("Can't find plugin " + name)
            return 1

        reqpath = os.path.join(dest_path, 'requirements.txt')
        if os.path.exists(reqpath):
            LOGGER.warning('This plugin has Python dependencies.')
            LOGGER.info('Installing dependencies with pip...')
            try:
                subprocess.check_call((sys.executable, '-m', 'pip', 'install', '-r', reqpath))
            except subprocess.CalledProcessError:
                LOGGER.error('Could not install the dependencies.')
                print('Contents of the requirements.txt file:\n')
                with io.open(reqpath, 'r', encoding='utf-8') as fh:
                    print(utils.indent(fh.read(), 4 * ' '))
                print('You have to install those yourself or through a '
                      'package manager.')
            else:
                LOGGER.info('Dependency installation succeeded.')

        reqnpypath = os.path.join(dest_path, 'requirements-nonpy.txt')
        if os.path.exists(reqnpypath):
            LOGGER.warning('This plugin has third-party '
                           'dependencies you need to install '
                           'manually.')
            print('Contents of the requirements-nonpy.txt file:\n')
            with io.open(reqnpypath, 'r', encoding='utf-8') as fh:
                for l in fh.readlines():
                    i, j = l.split('::')
                    print(utils.indent(i.strip(), 4 * ' '))
                    print(utils.indent(j.strip(), 8 * ' '))
                    print()

            print('You have to install those yourself or through a package '
                  'manager.')

        req_plug_path = os.path.join(dest_path, 'requirements-plugins.txt')
        if os.path.exists(req_plug_path):
            LOGGER.info('This plugin requires other Nikola plugins.')
            LOGGER.info('Installing plugins...')
            plugin_failure = False
            try:
                with io.open(req_plug_path, 'r', encoding='utf-8') as inf:
                    for plugname in inf.readlines():
                        plugin_failure = self.do_install(url, plugname.strip(), show_install_notes) != 0
            except Exception:
                plugin_failure = True
            if plugin_failure:
                LOGGER.error('Could not install a plugin.')
                print('Contents of the requirements-plugins.txt file:\n')
                with io.open(req_plug_path, 'r', encoding='utf-8') as fh:
                    print(utils.indent(fh.read(), 4 * ' '))
                print('You have to install those yourself manually.')
            else:
                LOGGER.info('Dependency installation succeeded.')

        confpypath = os.path.join(dest_path, 'conf.py.sample')
        if os.path.exists(confpypath) and show_install_notes:
            LOGGER.warning('This plugin has a sample config file.  Integrate it with yours in order to make this plugin work!')
            print('Contents of the conf.py.sample file:\n')
            with io.open(confpypath, 'r', encoding='utf-8') as fh:
                if self.site.colorful:
                    print(pygments.highlight(fh.read(), PythonLexer(), TerminalFormatter()))
                else:
                    print(fh.read())
        return 0

    def do_uninstall(self, name):
        """Uninstall a plugin."""
        for plugin in self.site.plugin_manager.getAllPlugins():  # FIXME: this is repeated thrice
            if name == plugin.name:  # Uninstall this one
                p = plugin.path
                if os.path.isdir(p):
                    # Plugins that have a package in them need to delete parent
                    # Issue #2356
                    p = p + os.sep
                    p = os.path.abspath(os.path.join(p, os.pardir))
                else:
                    p = os.path.dirname(p)
                LOGGER.warning('About to uninstall plugin: {0}'.format(name))
                LOGGER.warning('This will delete {0}'.format(p))
                sure = utils.ask_yesno('Are you sure?')
                if sure:
                    LOGGER.warning('Removing {0}'.format(p))
                    shutil.rmtree(p)
                    return 0
                return 1
        LOGGER.error('Unknown plugin: {0}'.format(name))
        return 1

    def get_json(self, url):
        """Download the JSON file with all plugins."""
        if self.json is None:
            try:
                try:
                    self.json = requests.get(url).json()
                except requests.exceptions.SSLError:
                    LOGGER.warning("SSL error, using http instead of https (press ^C to abort)")
                    time.sleep(1)
                    url = url.replace('https', 'http', 1)
                    self.json = requests.get(url).json()
            except json.decoder.JSONDecodeError as e:
                LOGGER.error("Failed to decode JSON data in response from server.")
                LOGGER.error("JSON error encountered: " + str(e))
                LOGGER.error("This issue might be caused by server-side issues, or by to unusual activity in your "
                             "network (as determined by CloudFlare). Please visit https://plugins.getnikola.com/ in "
                             "a browser.")
                sys.exit(2)

        return self.json
