import argparse
import logging
import os
import sys
import time
from datetime import datetime
from pathlib import Path
from typing import Optional

from PySide2 import QtWidgets
from PySide2.QtCore import Qt
from PySide2.QtGui import QPixmap
from PySide2.QtWidgets import QApplication, QCheckBox, QSplashScreen
from dcs.payloads import PayloadDirectories

from game import Game, VERSION, persistency
from game.campaignloader.campaign import Campaign
from game.data.weapons import Pylon, Weapon, WeaponGroup
from game.dcs.aircrafttype import AircraftType
from game.factions import FACTIONS
from game.profiling import logged_duration
from game.server import EventStream, Server
from game.settings import Settings
from game.sim import GameUpdateEvents
from game.theater.start_generator import GameGenerator, GeneratorSettings, ModSettings
from pydcs_extensions import load_mods
from qt_ui import (
    liberation_install,
    liberation_theme,
    logging_config,
    uiconstants,
)
from qt_ui.windows.GameUpdateSignal import GameUpdateSignal
from qt_ui.windows.QLiberationWindow import QLiberationWindow
from qt_ui.windows.newgame.QNewGameWizard import DEFAULT_BUDGET
from qt_ui.windows.preferences.QLiberationFirstStartWindow import (
    QLiberationFirstStartWindow,
)

THIS_DIR = Path(__file__).parent


def inject_custom_payloads(user_path: Path) -> None:
    dev_payloads = THIS_DIR.parent / "resources/customized_payloads"
    # The packaged release rearranges the file locations, so the release has the
    # customized payloads in a different location.
    release_payloads = THIS_DIR / "resources/customized_payloads"
    if dev_payloads.exists():
        payloads = dev_payloads
    elif release_payloads.exists():
        payloads = release_payloads
    else:
        raise RuntimeError(
            f"Could not find customized payloads at {release_payloads} or "
            f"{dev_payloads}. Aircraft will have no payloads."
        )
    # We configure these as fallbacks so that the user's payloads override ours.
    PayloadDirectories.set_fallback(payloads)
    PayloadDirectories.set_preferred(user_path / "MissionEditor" / "UnitPayloads")


def on_game_load(game: Game | None) -> None:
    EventStream.drain()
    EventStream.put_nowait(GameUpdateEvents().game_loaded(game))


def run_ui(game: Optional[Game], new_map: bool, dev: bool) -> None:
    os.environ["QT_AUTO_SCREEN_SCALE_FACTOR"] = "1"  # Potential fix for 4K screens
    app = QApplication(sys.argv)

    app.setAttribute(Qt.AA_DisableWindowContextHelpButton)

    # init the theme and load the stylesheet based on the theme index
    liberation_theme.init()
    with open(
        "./resources/stylesheets/" + liberation_theme.get_theme_css_file(),
        encoding="utf-8",
    ) as stylesheet:
        logging.info("Loading stylesheet: %s", liberation_theme.get_theme_css_file())
        app.setStyleSheet(stylesheet.read())

    first_start = liberation_install.init()
    if first_start:
        window = QLiberationFirstStartWindow()
        window.exec_()

    logging.info("Using {} as 'Saved Game Folder'".format(persistency.base_path()))
    logging.info(
        "Using {} as 'DCS installation folder'".format(
            liberation_install.get_dcs_install_directory()
        )
    )

    inject_custom_payloads(Path(persistency.base_path()))

    # Splash screen setup
    pixmap = QPixmap("./resources/ui/splash_screen.png")
    splash = QSplashScreen(pixmap)
    splash.show()

    # Developers are launching the game in a loop hundreds of times. We've read it.
    if not dev:
        # Give enough time to read splash screen
        time.sleep(3)

    # Once splash screen is up : load resources & setup stuff
    uiconstants.load_icons()
    uiconstants.load_event_icons()
    uiconstants.load_aircraft_icons()
    uiconstants.load_vehicle_icons()
    uiconstants.load_aircraft_banners()
    uiconstants.load_vehicle_banners()

    # Show warning if no DCS Installation directory was set
    if liberation_install.get_dcs_install_directory() == "":
        logging.warning(
            "DCS Installation directory is empty. MissionScripting file will not be replaced!"
        )
        if not liberation_install.ignore_empty_install_directory():
            ignore_checkbox = QCheckBox("Do not show again")
            ignore_checkbox.stateChanged.connect(set_ignore_empty_install_directory)
            message_box = QtWidgets.QMessageBox(parent=splash)
            message_box.setIcon(QtWidgets.QMessageBox.Icon.Warning)
            message_box.setWindowTitle("No DCS installation directory.")
            message_box.setText(
                "The DCS Installation directory is not set correctly. "
                "This will prevent DCS Liberation to work properly as the MissionScripting "
                "file will not be modified."
                "<br/><br/>To solve this problem, you can set the Installation directory "
                "within the preferences menu. You can also manually edit or replace the "
                "following file:"
                "<br/><br/><strong>&lt;dcs_installation_directory&gt;/Scripts/MissionScripting.lua</strong>"
                "<br/><br/>The easiest way to do it is to replace the original file with the file in dcs-liberation distribution (&lt;dcs_liberation_installation&gt;/resources/scripts/MissionScripting.lua)."
                "<br/><br/>You can find more information on how to manually change this file in the Liberation Wiki (Page: Dedicated Server Guide) on GitHub.</p>"
            )
            message_box.setDefaultButton(QtWidgets.QMessageBox.StandardButton.Ok)
            message_box.setCheckBox(ignore_checkbox)
            message_box.exec_()
    # Replace DCS Mission scripting file to allow DCS Liberation to work
    try:
        liberation_install.replace_mission_scripting_file()
    except:
        error_dialog = QtWidgets.QErrorMessage()
        error_dialog.setWindowTitle("Wrong DCS installation directory.")
        error_dialog.showMessage(
            "Unable to modify Mission Scripting file. Possible issues with rights. Try running as admin, or please perform the modification of the MissionScripting file manually."
        )
        error_dialog.exec_()

    # Apply CSS (need works)
    GameUpdateSignal()
    GameUpdateSignal.get_instance().game_loaded.connect(on_game_load)

    # Start window
    window = QLiberationWindow(game, new_map, dev)
    window.showMaximized()
    splash.finish(window)
    qt_execution_code = app.exec_()

    # Restore Mission Scripting file
    logging.info("QT App terminated with status code : " + str(qt_execution_code))
    logging.info("Attempt to restore original mission scripting file")
    liberation_install.restore_original_mission_scripting()
    logging.info("QT process exited with code : " + str(qt_execution_code))


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers(dest="subcommand")

    def path_arg(arg: str) -> Path:
        path = Path(arg)
        if not path.exists():
            raise argparse.ArgumentTypeError("path does not exist")
        return path

    parser.add_argument(
        "--warn-missing-weapon-data",
        action="store_true",
        help="Emits a warning for weapons without date or fallback information.",
    )

    parser.add_argument("--dev", action="store_true", help="Enable development mode.")

    parser.add_argument(
        "--new-map",
        action="store_true",
        default=True,
        help="Use the React based map. This is the default.",
    )
    parser.add_argument(
        "--old-map",
        dest="new_map",
        action="store_false",
        help="Use the legacy map. This will be removed before 6.0.0 is released.",
    )

    new_game = subparsers.add_parser("new-game")

    new_game.add_argument(
        "campaign", type=path_arg, help="Path to the campaign to start."
    )

    new_game.add_argument(
        "--blue", default="USA 2005", help="Name of the blue faction."
    )

    new_game.add_argument(
        "--red", default="Russia 1990", help="Name of the red faction."
    )

    new_game.add_argument(
        "--supercarrier", action="store_true", help="Use the supercarrier module."
    )

    new_game.add_argument(
        "--auto-procurement", action="store_true", help="Automate bluefor procurement."
    )

    new_game.add_argument(
        "--inverted", action="store_true", help="Invert the campaign."
    )

    new_game.add_argument(
        "--date",
        type=datetime.fromisoformat,
        default=datetime.today(),
        help="Start date of the campaign.",
    )

    new_game.add_argument(
        "--restrict-weapons-by-date",
        action="store_true",
        help="Enable campaign date restricted weapons.",
    )

    new_game.add_argument("--cheats", action="store_true", help="Enable cheats.")

    lint_weapons = subparsers.add_parser("lint-weapons")
    lint_weapons.add_argument("aircraft", help="Name of the aircraft variant to lint.")

    return parser.parse_args()


def create_game(
    campaign_path: Path,
    blue: str,
    red: str,
    supercarrier: bool,
    auto_procurement: bool,
    inverted: bool,
    cheats: bool,
    start_date: datetime,
    restrict_weapons_by_date: bool,
) -> Game:
    first_start = liberation_install.init()
    if first_start:
        sys.exit(
            "Cannot generate campaign without configuring DCS Liberation. Start the UI "
            "for the first run configuration."
        )

    # This needs to run before the pydcs payload cache is created, which happens
    # extremely early. It's not a problem that we inject these paths twice because we'll
    # get the same answers each time.
    #
    # Without this, it is not possible to use next turn (or anything that needs to check
    # for loadouts) without saving the generated campaign and reloading it the normal
    # way.
    inject_custom_payloads(Path(persistency.base_path()))
    campaign = Campaign.from_file(campaign_path)
    theater = campaign.load_theater()
    generator = GameGenerator(
        FACTIONS[blue],
        FACTIONS[red],
        theater,
        campaign.load_air_wing_config(theater),
        Settings(
            supercarrier=supercarrier,
            automate_runway_repair=auto_procurement,
            automate_front_line_reinforcements=auto_procurement,
            automate_aircraft_reinforcements=auto_procurement,
            enable_frontline_cheats=cheats,
            enable_base_capture_cheat=cheats,
            restrict_weapons_by_date=restrict_weapons_by_date,
        ),
        GeneratorSettings(
            start_date=start_date,
            player_budget=DEFAULT_BUDGET,
            enemy_budget=DEFAULT_BUDGET,
            inverted=inverted,
            no_carrier=False,
            no_lha=False,
            no_player_navy=False,
            no_enemy_navy=False,
        ),
        ModSettings(
            a4_skyhawk=False,
            f22_raptor=False,
            f104_starfighter=False,
            hercules=False,
            jas39_gripen=False,
            su57_felon=False,
            frenchpack=False,
            high_digit_sams=False,
        ),
    )
    game = generator.generate()
    game.begin_turn_0()
    return game


def set_ignore_empty_install_directory(value: bool) -> None:
    liberation_install.set_ignore_empty_install_directory(value)
    liberation_install.save_config()


def lint_all_weapon_data() -> None:
    for weapon in WeaponGroup.named("Unknown").weapons:
        logging.warning(f"No weapon data for {weapon}: {weapon.clsid}")


def lint_weapon_data_for_aircraft(aircraft: AircraftType) -> None:
    all_weapons: set[Weapon] = set()
    for pylon in Pylon.iter_pylons(aircraft):
        all_weapons |= pylon.allowed

    for weapon in all_weapons:
        if weapon.weapon_group.name == "Unknown":
            logging.warning(f'{weapon.clsid} "{weapon.name}" has no weapon data')


def main():
    logging_config.init_logging(VERSION)

    logging.debug("Python version %s", sys.version)

    if not str(Path(__file__)).isascii():
        logging.warning(
            "Installation path contains non-ASCII characters. This is known to cause problems."
        )

    game: Optional[Game] = None

    args = parse_args()

    # TODO: Flesh out data and then make unconditional.
    if args.warn_missing_weapon_data:
        lint_all_weapon_data()

    load_mods()

    if args.subcommand == "new-game":
        with logged_duration("New game creation"):
            game = create_game(
                args.campaign,
                args.blue,
                args.red,
                args.supercarrier,
                args.auto_procurement,
                args.inverted,
                args.cheats,
                args.date,
                args.restrict_weapons_by_date,
            )
    if args.subcommand == "lint-weapons":
        lint_weapon_data_for_aircraft(AircraftType.named(args.aircraft))
        return

    with Server().run_in_thread():
        run_ui(game, args.new_map, args.dev)


if __name__ == "__main__":
    main()