import { text } from './utils/fetch.mjs';
import Setting from './utils/setting.mjs';
import { registerHiddenSetting } from './share.mjs';
import { withBasePath } from './utils/base-path.mjs';

let playlist;
let currentTrack = 0;
let player;
let alertTonePlayer;
let sliderTimeout = null;
let volumeSlider = null;
let volumeSliderInput = null;
let alertToneActive = false;
let alertTonePending = false;
let audioUnlocked = false;

const ALERT_DUCK_VOLUME = 0.05;
const MAX_MEDIA_VOLUME = 0.20;

const isAlertToneBlockingMedia = () => alertToneActive || alertTonePending;

const clampMediaVolume = (value) => Math.min(Math.max(value, ALERT_DUCK_VOLUME), MAX_MEDIA_VOLUME);

const getActiveMediaVolume = () => {
	if (isAlertToneBlockingMedia()) {
		return ALERT_DUCK_VOLUME;
	}
	return clampMediaVolume(mediaVolume.value);
};

const mediaPlaying = new Setting('mediaPlaying', {
	name: 'Media Playing',
	type: 'boolean',
	defaultValue: false,
	sticky: true,
});

document.addEventListener('DOMContentLoaded', () => {
	// add the event handler to the page
	document.getElementById('ToggleMedia').addEventListener('click', handleClick);
	// get the slider elements
	volumeSlider = document.querySelector('#ToggleMediaContainer .volume-slider');
	volumeSliderInput = volumeSlider.querySelector('input');

	// catch interactions with the volume slider (timeout handler)
	// called on any interaction via 'input' (vs change) for immediate volume response
	volumeSlider.addEventListener('input', setSliderTimeout);
	volumeSlider.addEventListener('input', sliderChanged);

	// add listener for mute (pause) button under the volume slider
	volumeSlider.querySelector('img').addEventListener('click', stopMedia);

	// get the playlist
	getMedia();
	registerAudioUnlockHandlers();

	// register the volume setting
	registerHiddenSetting(mediaVolume.elemId, mediaVolume);
	if (mediaVolume.value !== clampMediaVolume(mediaVolume.value)) {
		mediaVolume.value = clampMediaVolume(mediaVolume.value);
	}

	// Screen audio setting is managed via localStorage and checked directly in playScreenAudio()
});

const unlockAudio = () => {
	if (audioUnlocked) return;
	audioUnlocked = true;
	if (alertTonePending) {
		startAlertTone();
	}
};

const registerAudioUnlockHandlers = () => {
	['pointerdown', 'keydown', 'touchstart'].forEach((eventName) => {
		document.addEventListener(eventName, unlockAudio, { passive: true, once: true });
	});
};

const scanMusicDirectory = async () => {
	const parseDirectory = async (path, prefix = '') => {
		const listing = await text(path);
		const matches = [...listing.matchAll(/href="([^"]+\.mp3)"/gi)];
		return matches.map((m) => `${prefix}${m[1]}`);
	};

	try {
		let files = await parseDirectory('music/');
		if (files.length === 0) {
			files = await parseDirectory('music/default/', 'default/');
		}
		return { availableFiles: files };
	} catch (e) {
		console.error('Unable to scan music directory');
		console.error(e);
		return { availableFiles: [] };
	}
};

const getMedia = async () => {
	let playlistSource = '';

	try {
		const response = await fetch('playlist.json');
		if (response.ok) {
			playlist = await response.json();
			playlistSource = 'from server';
		} else if (response.status === 404 && response.headers.get('X-Weatherstar') === 'true') {
			// Expected behavior in static deployment mode
			playlist = await scanMusicDirectory();
			playlistSource = 'via directory scan (static deployment)';
		} else {
			playlist = { availableFiles: [] };
			playlistSource = `failed (${response.status} ${response.statusText})`;
		}
	} catch (_e) {
		// Network error or other fetch failure - fall back to directory scanning
		playlist = await scanMusicDirectory();
		playlistSource = 'via directory scan (after fetch failed)';
	}

	const fileCount = playlist?.availableFiles?.length || 0;
	if (fileCount > 0) {
		console.log(`Loaded playlist ${playlistSource} - found ${fileCount} music file${fileCount === 1 ? '' : 's'}`);
	} else {
		console.log(`No music files found ${playlistSource}`);
	}

	enableMediaPlayer();
};

const enableMediaPlayer = () => {
	// see if files are available
	if (playlist?.availableFiles?.length > 0) {
		// randomize the list
		randomizePlaylist();
		// enable the icon
		const icon = document.getElementById('ToggleMediaContainer');
		icon.classList.add('available');
		// set the button type
		setIcon();
		// if we're already playing (sticky option) then try to start playing
		if (mediaPlaying.value === true) {
			startMedia();
		}
	}
};

const setIcon = () => {
	// get the icon
	const icon = document.getElementById('ToggleMediaContainer');
	if (mediaPlaying.value === true) {
		icon.classList.add('playing');
	} else {
		icon.classList.remove('playing');
	}
};

const handleClick = () => {
	// if media is off, start it
	if (mediaPlaying.value === false) {
		mediaPlaying.value = true;
	}

	if (mediaPlaying.value === true && !volumeSlider.classList.contains('show')) {
		// if media is playing and the slider isn't open, open it
		showVolumeSlider();
	} else {
		// hide the volume slider
		hideVolumeSlider();
	}

	// handle the state change
	stateChanged();
};

// set a timeout for the volume slider (called by interactions with the slider)
const setSliderTimeout = () => {
	// clear existing timeout
	if (sliderTimeout) clearTimeout(sliderTimeout);
	// set a new timeout
	sliderTimeout = setTimeout(hideVolumeSlider, 5000);
};

// show the volume slider and configure a timeout
const showVolumeSlider = () => {
	setSliderTimeout();

	// show the slider
	if (volumeSlider) {
		volumeSlider.classList.add('show');
	}
};

// hide the volume slider and clean up the timeout
const hideVolumeSlider = () => {
	// clear the timeout handler
	if (sliderTimeout) clearTimeout(sliderTimeout);
	sliderTimeout = null;

	// hide the element
	if (volumeSlider) {
		volumeSlider.classList.remove('show');
	}
};

const startMedia = async () => {
	// if there's not media player yet, enable it
	if (!player) {
		initializePlayer();
	} else {
		try {
			player.volume = getActiveMediaVolume();
			await player.play();
			setTrackName(playlist.availableFiles[currentTrack]);
		} catch (e) {
			// report the error
			console.error('Couldn\'t play music');
			console.error(e);
			// set state back to not playing for good UI experience
			mediaPlaying.value = false;
			stateChanged();
			setTrackName('Not playing');
		}
	}
};

const stopMedia = () => {
	hideVolumeSlider();
	if (!player) return;
	player.pause();
	mediaPlaying.value = false;
	setTrackName('Not playing');
	setIcon();
};

const stateChanged = () => {
	// update the icon
	setIcon();
	// react to the new state
	if (mediaPlaying.value) {
		startMedia();
	} else {
		stopMedia();
	}
};

const randomizePlaylist = () => {
	let availableFiles = [...playlist.availableFiles];
	const randomPlaylist = [];
	while (availableFiles.length > 0) {
		// get a randon item from the available files
		const i = Math.floor(Math.random() * availableFiles.length);
		// add it to the final list
		randomPlaylist.push(availableFiles[i]);
		// remove the file from the available files
		availableFiles = availableFiles.filter((file, index) => index !== i);
	}
	playlist.availableFiles = randomPlaylist;
};

const setVolume = (newVolume) => {
	const clampedVolume = clampMediaVolume(newVolume);
	if (player) {
		player.volume = isAlertToneBlockingMedia() ? ALERT_DUCK_VOLUME : clampedVolume;
	}
};

const sliderChanged = () => {
	// get the value of the slider
	if (volumeSlider) {
		const newValue = volumeSliderInput.value;
		const cleanValue = clampMediaVolume(parseFloat(newValue) / 100);
		mediaVolume.value = cleanValue;
	}
};

const mediaVolume = new Setting('mediaVolume', {
	name: 'Volume',
	type: 'select',
	defaultValue: 0.15,
	values: [
		[0.20, '20%'],
		[0.15, '15%'],
		[0.10, '10%'],
		[0.05, '5%'],
	],
	changeAction: setVolume,
});

const initializePlayer = () => {
	// basic sanity checks
	if (!playlist.availableFiles || playlist?.availableFiles.length === 0) {
		throw new Error('No playlist available');
	}
	if (player) {
		return;
	}
	// create the player
	player = new Audio();

	// reset the playlist index
	currentTrack = 0;

	// add event handlers
	player.addEventListener('canplay', playerCanPlay);
	player.addEventListener('ended', playerEnded);

	// get the first file
	player.src = `music/${playlist.availableFiles[currentTrack]}`;
	setTrackName(playlist.availableFiles[currentTrack]);
	player.type = 'audio/mpeg';
	// set volume and slider indicator
	setVolume(getActiveMediaVolume());
	volumeSliderInput.value = Math.round(mediaVolume.value * 100);
};

const initializeAlertTonePlayer = () => {
	if (alertTonePlayer) return;
	alertTonePlayer = new Audio(withBasePath('alert/tone.mp3'));
	alertTonePlayer.type = 'audio/mpeg';
	alertTonePlayer.preload = 'auto';
	alertTonePlayer.addEventListener('ended', finishAlertTone);
};

const duckMediaForAlert = () => {
	if (!player || player.paused) return;
	player.volume = ALERT_DUCK_VOLUME;
};

const restoreMediaAfterAlert = () => {
	if (!player) return;
	player.volume = clampMediaVolume(mediaVolume.value);
};

const finishAlertTone = () => {
	alertToneActive = false;
	alertTonePending = false;
	restoreMediaAfterAlert();
};

const startAlertTone = async () => {
	if (!audioUnlocked) {
		alertTonePending = true;
		return;
	}
	stopScreenAudio(); // Stop screen audio when alert plays
	initializeAlertTonePlayer();
	try {
		alertTonePending = true;
		duckMediaForAlert();
		alertToneActive = true;
		alertTonePlayer.currentTime = 0;
		await alertTonePlayer.play();
		alertTonePending = false;
	} catch (e) {
		alertToneActive = false;
		alertTonePending = false;
		restoreMediaAfterAlert();
		console.error('Couldn\'t play alert tone');
		console.error(e);
	}
};

const stopAlertTone = () => {
	alertTonePending = false;
	if (alertTonePlayer) {
		alertTonePlayer.pause();
		alertTonePlayer.currentTime = 0;
	}
	finishAlertTone();
};

const playAlertTone = () => startAlertTone();

// Screen audio constants and variables
const SCREEN_AUDIO_DUCK_VOLUME = 0.10; // 10% ducking (vs 5% for alerts)
const screenAudioMap = {
	'radar': 'local-radar.mp3',
	'regional-forecast': 'regional-observations.mp3',
	'travel': 'travel-forecast.mp3',
	'hourly-graph': 'hourly-graph.mp3',
	'hourly': 'hourly-forecast.mp3',
	'server-observations': 'server-obs.mp3',
	'current-weather': 'current-conditions.mp3',
};

let screenAudioPlayer = null;
let audioStartTime = 0;
let audioStopTimeout = null;
const AUDIO_MIN_PLAY_TIME = 500; // 500ms minimum play time
let currentScreenId = null;

// Helper function to check if screen audio is enabled (always reads from localStorage)
const isScreenAudioEnabled = () => {
	const saved = window.localStorage.getItem('screenAudioEnabled');
	return saved !== null ? saved === 'true' : true; // Default: enabled
};

// Play screen audio
const playScreenAudio = async (screenId) => {
	console.log(`[AUDIO] playScreenAudio called for ${screenId}`);
	
	// Always check localStorage to ensure setting is current
	if (!isScreenAudioEnabled()) {
		console.log(`[AUDIO] Aborting - screen audio disabled`);
		return;
	}
	
	const fileName = screenAudioMap[screenId];
	if (!fileName) {
		console.log(`[AUDIO] No audio file mapped for ${screenId}`);
		return;
	}
	
	// Cancel any pending stop timeout from previous audio
	if (audioStopTimeout) {
		console.log(`[AUDIO] Cancelling pending stop timeout for new audio`);
		clearTimeout(audioStopTimeout);
		audioStopTimeout = null;
	}
	
	// Stop any existing screen audio first
	stopScreenAudio();
	
	// Don't play if alert tone is active
	if (alertToneActive || alertTonePending) {
		console.log(`[AUDIO] Aborting - alert tone active/pending`);
		return;
	}
	
	// Duck background music to 10%
	if (player && !player.paused) {
		player.volume = SCREEN_AUDIO_DUCK_VOLUME;
	}
	
	// Create and play audio
	screenAudioPlayer = new Audio(withBasePath(`alert/${fileName}`));
	screenAudioPlayer.type = 'audio/mpeg';
	currentScreenId = screenId;
	
	screenAudioPlayer.addEventListener('ended', () => {
		console.log(`[AUDIO] 'ended' event fired for ${currentScreenId}`);
		screenAudioPlayer = null;
		currentScreenId = null;
		// Only restore if alert isn't playing
		if (!alertToneActive && !alertTonePending) {
			restoreMediaAfterAlert();
		}
	});
	
	screenAudioPlayer.addEventListener('error', (e) => {
		console.log(`[AUDIO] 'error' event fired for ${currentScreenId}:`, e.message || e);
		screenAudioPlayer = null;
		currentScreenId = null;
		if (!alertToneActive && !alertTonePending) {
			restoreMediaAfterAlert();
		}
	});
	
	try {
		await screenAudioPlayer.play();
		audioStartTime = Date.now();
		console.log(`[AUDIO] Audio started for ${screenId} at ${audioStartTime}`);
	} catch (e) {
		console.log(`[AUDIO] Failed to play for ${screenId}:`, e.message);
		screenAudioPlayer = null;
		currentScreenId = null;
		if (!alertToneActive && !alertTonePending) {
			restoreMediaAfterAlert();
		}
	}
};

// Actually stop the audio (internal helper)
const actuallyStopAudio = () => {
	console.log(`[AUDIO] Actually stopping audio for ${currentScreenId}`);
	if (screenAudioPlayer) {
		screenAudioPlayer.pause();
		screenAudioPlayer.currentTime = 0;
		screenAudioPlayer = null;
	}
	currentScreenId = null;
	audioStartTime = 0;
	audioStopTimeout = null;
};

// Stop screen audio (with minimum play time protection)
const stopScreenAudio = () => {
	if (!screenAudioPlayer) {
		console.log(`[AUDIO] stopScreenAudio called but no audio playing`);
		return;
	}
	
	const elapsed = Date.now() - audioStartTime;
	console.log(`[AUDIO] stopScreenAudio called for ${currentScreenId}, elapsed: ${elapsed}ms`);
	
	// If we haven't played for the minimum time, delay the stop
	if (elapsed < AUDIO_MIN_PLAY_TIME) {
		const delay = AUDIO_MIN_PLAY_TIME - elapsed;
		console.log(`[AUDIO] Delaying stop for ${delay}ms (minimum play time: ${AUDIO_MIN_PLAY_TIME}ms)`);
		
		// Clear any existing timeout first
		if (audioStopTimeout) {
			clearTimeout(audioStopTimeout);
		}
		
		audioStopTimeout = setTimeout(() => {
			// Check if this audio is still the current one (might have been replaced)
			if (screenAudioPlayer && Date.now() - audioStartTime >= AUDIO_MIN_PLAY_TIME) {
				console.log(`[AUDIO] Executing delayed stop for ${currentScreenId}`);
				actuallyStopAudio();
				// Restore music volume after delayed stop
				if (!alertToneActive && !alertTonePending) {
					restoreMediaAfterAlert();
				}
			} else {
				console.log(`[AUDIO] Delayed stop cancelled - audio already changed or stopped`);
			}
		}, delay);
	} else {
		// Minimum play time met, stop immediately
		console.log(`[AUDIO] Minimum play time met, stopping immediately`);
		actuallyStopAudio();
	}
};

const playerCanPlay = async () => {
	// check to make sure they user still wants music (protect against slow loading music)
	if (!mediaPlaying.value) return;
	// start playing
	startMedia();
};

const playerEnded = () => {
	// next track
	currentTrack += 1;
	// roll over and re-randomize the tracks
	if (currentTrack >= playlist.availableFiles.length) {
		randomizePlaylist();
		currentTrack = 0;
	}
	// update the player source
	player.src = `music/${playlist.availableFiles[currentTrack]}`;
	setTrackName(playlist.availableFiles[currentTrack]);
};

const setTrackName = (fileName) => {
	const baseName = fileName.split('/').pop();
	const trackName = decodeURIComponent(
		baseName.replace(/\.mp3/gi, '').replace(/(_-)/gi, ''),
	);
	document.getElementById('musicTrack').innerHTML = trackName;
};

export {
	handleClick,
	playAlertTone,
	stopAlertTone,
	playScreenAudio,
	stopScreenAudio,
};