"""
Copyright © 2022 Noah Vogt <noah@noahvogt.com>

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 3 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, see <http://www.gnu.org/licenses/>.
"""

import sys
from os import path
from subprocess import Popen
from shlex import split
from time import sleep
from re import match

from pyautogui import keyDown, keyUp
from PyQt5.QtWidgets import (  # pylint: disable=no-name-in-module
    QApplication,
    QMessageBox,
)
from PyQt5.QtWidgets import (  # pylint: disable=no-name-in-module
    QDialog,
)
from PyQt5.QtCore import QTimer  # pylint: disable=no-name-in-module

from utils import (
    log,
    error_msg,
    get_yyyy_mm_dd_date,
    expand_dir,
)
from input import (
    validate_cd_record_config,
    RadioButtonDialog,
    InfoMsgBox,
)
from os_agnostic import get_cd_drives, eject_drive
import config as const


def make_sure_file_exists(cachefile: str) -> None:
    if not path.isfile(cachefile):
        try:
            with open(
                cachefile, mode="w+", encoding="utf-8-sig"
            ) as file_creator:
                file_creator.write("")
        except (FileNotFoundError, PermissionError, IOError) as error:
            error_msg(
                "Failed to create file in '{}'. Reason: {}".format(
                    cachefile, error
                )
            )


def choose_right_cd_drive(drives: list) -> str:
    if len(drives) != 1:
        log("Warning: More than one cd drive found", color="yellow")
        if (
            const.CD_RECORD_PREFERED_DRIVE in drives
            and const.CD_RECORD_PREFERED_DRIVE != ""
        ):
            return const.CD_RECORD_PREFERED_DRIVE

        dialog = RadioButtonDialog(drives, "Choose a CD to Burn")
        if dialog.exec_() == QDialog.Accepted:
            print(f"Dialog accepted: {dialog.chosen}")
            return dialog.chosen
        log("Warning: Choosing first cd drive...", color="yellow")

    return drives[0]


def get_burn_cmd(cd_drive: str, yyyy_mm_dd) -> str:
    cue_sheet_path = path.join(
        expand_dir(const.CD_RECORD_OUTPUT_BASEDIR), yyyy_mm_dd, "sheet.cue"
    )
    return (
        f"cdrecord -pad dev={cd_drive} -dao -swab -text -audio "
        + f"-cuefile={cue_sheet_path}"
    )


def switch_to_song(song_number: int) -> None:
    if song_number > const.OBS_MIN_SUBDIRS:
        song_number = 1
    log("sending hotkey to switch to scene {}".format(song_number), "cyan")
    scene_switch_hotkey = list(const.OBS_SWITCH_TO_SCENE_HOTKEY_PREFIX)
    scene_switch_hotkey.append("f{}".format(song_number))
    safe_send_hotkey(scene_switch_hotkey)

    log("sending hotkey to transition to scene {}".format(song_number), "cyan")
    safe_send_hotkey(const.OBS_TRANSITION_HOTKEY)

    create_cachfile_for_song(song_number)


def safe_send_hotkey(hotkey: list, sleep_time=0.1) -> None:
    for key in hotkey:
        keyDown(key)
    sleep(sleep_time)
    for key in hotkey:
        keyUp(key)


def create_cachfile_for_song(song) -> None:
    log("writing song {} to cachefile...".format(song))
    try:
        with open(
            const.NEXTSONG_CACHE_FILE, mode="w", encoding="utf-8-sig"
        ) as file_writer:
            file_writer.write(get_yyyy_mm_dd_date() + "\n")
            file_writer.write(str(song) + "\n")
    except (FileNotFoundError, PermissionError, IOError) as error:
        error_msg(
            "Failed to write to cachefile '{}'. Reason: {}".format(
                const.NEXTSONG_CACHE_FILE, error
            )
        )


def is_valid_cd_record_checkfile(
    cachefile_content: list, yyyy_mm_dd: str
) -> bool:
    return (
        len(cachefile_content) == 5
        # YYYY-MM-DD
        and bool(match(r"[0-9]{4}-[0-9]{2}-[0-9]{2}$", cachefile_content[0]))
        # last marker
        and bool(match(r"^[0-9]+$", cachefile_content[1]))
        # pid of ffmpeg recording instance
        and bool(match(r"^[0-9]+$", cachefile_content[2]))
        # unix milis @ recording start
        and bool(match(r"^[0-9]+$", cachefile_content[3]))
        # unix milis @ last track
        and bool(match(r"^[0-9]+$", cachefile_content[4]))
        # date matches today
        and cachefile_content[0].strip() == yyyy_mm_dd
    )


class CDBurnerGUI:
    def __init__(self, cd_drive: str, yyyy_mm_dd: str):
        self.app = QApplication([])
        self.drive = cd_drive
        self.yyyy_mm_dd = yyyy_mm_dd
        self.exit_code = 1
        self.show_burning_msg_box()
        self.start_burn_subprocess()
        self.app.exec_()

    def burning_successful(self) -> bool:
        if self.exit_code == 0:
            return True
        return False

    def show_burning_msg_box(self):
        self.message_box = QMessageBox()
        self.message_box.setWindowTitle("Info")
        self.message_box.setText("Burning CD...")
        self.message_box.setInformativeText(
            "Please wait for a few minutes. You can close this Window, as "
            + "there will spawn another window after the operation is "
            + "finished."
        )

        self.message_box.show()

    def start_burn_subprocess(self):
        process = Popen(split(get_burn_cmd(self.drive, self.yyyy_mm_dd)))

        while process.poll() is None:
            QApplication.processEvents()
        self.message_box.accept()

        # Yeah this is hacky but it doesn't work when calling quit directly
        QTimer.singleShot(0, self.app.quit)
        self.exit_code = process.returncode


def burn_cd_of_day(yyyy_mm_dd: str) -> None:
    validate_cd_record_config()
    make_sure_file_exists(const.CD_RECORD_CACHEFILE)

    cd_drives = get_cd_drives()
    if not cd_drives:
        InfoMsgBox(
            QMessageBox.Critical,
            "Error",
            "Error: Could not find a CD-ROM. Please try again",
        )
        sys.exit(1)
    drive = choose_right_cd_drive(cd_drives)

    burn_success = CDBurnerGUI(drive, yyyy_mm_dd).burning_successful()
    if burn_success:
        InfoMsgBox(QMessageBox.Info, "Info", "Successfully burned CD.")
    else:
        InfoMsgBox(QMessageBox.Critical, "Error", "Error: Failed to burn CD.")

    eject_drive(drive)