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

import dcs
from dcs.weapons_data import weapon_ids

from PySide2 import QtWidgets
from PySide2.QtGui import QPixmap
from PySide2.QtWidgets import QApplication, QSplashScreen

from game import Game, db, persistency, VERSION
from game.data.weapons import (
    WEAPON_FALLBACK_MAP,
    WEAPON_INTRODUCTION_YEARS,
    Weapon,
)
from game.settings import Settings
from game.theater.start_generator import GameGenerator, GeneratorSettings
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.QCampaignList import Campaign
from qt_ui.windows.newgame.QNewGameWizard import DEFAULT_BUDGET
from qt_ui.windows.preferences.QLiberationFirstStartWindow import \
    QLiberationFirstStartWindow


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

    # 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()) as stylesheet:
        logging.info('Loading stylesheet: %s', liberation_theme.get_theme_css_file())
        app.setStyleSheet(stylesheet.read())

    # Inject custom payload in pydcs framework
    custom_payloads = os.path.join(os.path.dirname(os.path.realpath(__file__)), "..\\resources\\customized_payloads")
    if os.path.exists(custom_payloads):
        dcs.unittype.FlyingType.payload_dirs.append(custom_payloads)
    else:
        # For release version the path is different.
        custom_payloads = os.path.join(os.path.dirname(os.path.realpath(__file__)),
                                       "resources\\customized_payloads")
        if os.path.exists(custom_payloads):
            dcs.unittype.FlyingType.payload_dirs.append(custom_payloads)

    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()))

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

    # 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()

    # 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()

    # Start window
    window = QLiberationWindow(game)
    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."
    )

    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."
    )

    return parser.parse_args()


def create_game(campaign_path: Path, blue: str, red: str,
                supercarrier: bool, auto_procurement: bool,
                inverted: bool) -> Game:
    campaign = Campaign.from_json(campaign_path)
    generator = GameGenerator(
        blue, red, campaign.load_theater(),
        Settings(
            supercarrier=supercarrier,
            automate_runway_repair=auto_procurement,
            automate_front_line_reinforcements=auto_procurement,
            automate_aircraft_reinforcements=auto_procurement
        ),
        GeneratorSettings(
            start_date=datetime.today(),
            player_budget=DEFAULT_BUDGET,
            enemy_budget=DEFAULT_BUDGET,
            midgame=False,
            inverted=inverted,
            no_carrier=False,
            no_lha=False,
            no_player_navy=False,
            no_enemy_navy=False
        )
    )
    return generator.generate()


def lint_weapon_data() -> None:
    for clsid in weapon_ids:
        weapon = Weapon.from_clsid(clsid)
        if weapon not in WEAPON_INTRODUCTION_YEARS:
            logging.warning(f"{weapon} has no introduction date")
        if weapon not in WEAPON_FALLBACK_MAP:
            logging.warning(f"{weapon} has no fallback")


def main():
    logging_config.init_logging(VERSION)

    # Load eagerly to catch errors early.
    db.FACTIONS.initialize()

    game: Optional[Game] = None

    args = parse_args()

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

    if args.subcommand == "new-game":
        game = create_game(args.campaign, args.blue, args.red,
                           args.supercarrier, args.auto_procurement,
                           args.inverted)

    run_ui(game)


if __name__ == "__main__":
    main()