import os
import re
import shutil
import tarfile
import tempfile
from pathlib import Path

import dearpygui.dearpygui as dpg
import requests

from vrutil.dialogs import Dialogs
from vrutil.utils import loaded

_GE_PROTON_GITHUB = 'GloriousEggroll/proton-ge-custom'
_GE_PROTON_INSTALL_DIR = '{steam_dir}/compatibilitytools.d'


class GeProtonSettings:
    """GE Proton related settings"""

    def __init__(self, steam_dir: str, dialogs: Dialogs):
        self._install_dir = _GE_PROTON_INSTALL_DIR.format(steam_dir=steam_dir)
        self._dialogs = dialogs
        self._installed_list = None
        self._available_list = None
        self._page_indicator_item = None
        self._cur_page = 0
        self._max_page = 0
        self._page_links = {
            'first': '',
            'prev': '',
            'next': '',
            'last': ''
        }

    def create_views(self):
        with dpg.collapsing_header(label='GE Proton', default_open=True):

            with dpg.group(horizontal=True):

                # INSTALLED

                with dpg.group(horizontal=False):
                    dpg.add_text('Installed versions:')
                    dpg.add_button(label='Delete', callback=self._delete_installed)
                    self._installed_list = dpg.add_listbox(
                        items=self._get_installed(),
                        width=250,
                        num_items=8
                    )

                # AVAILABLE

                with dpg.group(horizontal=False):
                    dpg.add_text('Available versions:')

                    with dpg.group(horizontal=True):
                        dpg.add_button(label='Install', callback=self._install)
                        dpg.add_button(label='Reload', callback=self.reload_available)
                        dpg.add_button(label='⇇', user_data='first', callback=self._switch_page)
                        dpg.add_button(label='←', user_data='prev', callback=self._switch_page)
                        self._page_indicator_item = dpg.add_text('0/0')
                        dpg.add_button(label='→', user_data='next', callback=self._switch_page)
                        dpg.add_button(label='⇉', user_data='last', callback=self._switch_page)

                    self._available_list = dpg.add_listbox(
                        items=(),
                        width=250,
                        num_items=8
                    )

            dpg.add_spacer(height=10)

    # region Installed

    def reload_installed(self):
        dpg.configure_item(self._installed_list, items=self._get_installed())

    def _get_installed(self):
        installed = os.listdir(self._install_dir)
        sorted_versions = tuple(sorted(installed, reverse=True))
        loaded('GE Proton installed', sorted_versions)
        return sorted_versions

    def _delete_installed(self):
        version = dpg.get_value(self._installed_list)
        install_path = f'{self._install_dir}/{version}'
        self._dialogs.show_alert(
            title=f'Delete {version}?',
            message=f'Will remove\n{install_path}',
            confirm='Delete',
            on_confirm=lambda: self._confirmed_delete_installed(install_path),
            on_dismiss=lambda: self._dialogs.hide_alert()
        )

    def _confirmed_delete_installed(self, version):
        self._dialogs.hide_alert()
        self._dialogs.show_loading(title='Deleting...', message=version)
        print(f'Deleting {version}')
        shutil.rmtree(version)
        self.reload_installed()
        print('Done deleting')
        self._dialogs.hide_loading()

    # endregion

    # region Available

    def reload_available(self):
        self._cur_page = 1
        self._max_page = 1
        dpg.configure_item(self._available_list, items=self._get_available())

    def _get_available(self, link=None):
        url = link or f'https://api.github.com/repos/{_GE_PROTON_GITHUB}/releases'
        response = requests.get(url)
        self._update_page_links(response.headers['Link'])
        releases = response.json()
        release_names = list(map(lambda release: release['tag_name'], releases))
        sorted_releases = tuple(sorted(release_names, reverse=True))
        loaded('GE Proton releases', sorted_releases)
        return sorted_releases

    def _update_page_links(self, links):
        matches = re.findall('<(\\S+)>; rel=\\"(\\w+)\\"', links)
        for link in self._page_links:
            self._page_links[link] = ''
        for match in matches:
            self._page_links[match[1]] = match[0]
        if self._page_links['last'] != '':
            self._max_page = self._page_links['last'].split('=')[1]
        dpg.set_value(self._page_indicator_item, f'{self._cur_page}/{self._max_page}')

    def _switch_page(self, sender, app_data, user_data):
        print(f'Switching page {user_data}')
        link = self._page_links[user_data]
        if link != '':
            self._cur_page = link.split('=')[1]
            dpg.configure_item(self._available_list, items=self._get_available(link))

    def _install(self):
        version = dpg.get_value(self._available_list)
        url = f'https://github.com/{_GE_PROTON_GITHUB}/releases/download/{version}/{version}.tar.gz'
        tar_file_path = f'{tempfile.gettempdir()}/{version}.tar.gz'
        target_extract_path = self._install_dir

        if version is None or version == '':
            self._dialogs.show_alert(
                title=f'No version selected!',
                message='Reload the release list and select a version to install.',
                on_confirm=lambda: self._dialogs.hide_alert()
            )
            return
        if version in self._get_installed():
            self._dialogs.show_alert(
                title=f'Version {version} already installed!',
                message='To download again, delete it first',
                on_confirm=lambda: self._dialogs.hide_alert()
            )
            return

        print(f'Loading {url} to {tar_file_path}')
        title = f'Installing {version}'
        self._dialogs.show_loading(title=title, message='Downloading...')
        response = requests.get(url, stream=True)
        if response.status_code == 200:
            with open(tar_file_path, 'wb') as temp_file:
                temp_file.write(response.raw.read())
            print('Download complete, start extracting...')
            self._dialogs.show_loading(title=title, message='Extracting...')
            with tarfile.open(tar_file_path) as tar_file:
                tar_file.extractall(target_extract_path)
            print('Done installing')
        else:
            print(response.status_code)
            print(response.text)
        if Path(tar_file_path).exists():
            os.remove(tar_file_path)
        self._dialogs.hide_loading()
        self.reload_installed()
        dpg.set_value(self._installed_list, version)

    # endregion