/*
 * Copyright 2021 James Lyne
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {useStore} from "@/store";
import LiveAtlasMapDefinition from "@/model/LiveAtlasMapDefinition";
import {HeadQueueEntry, LiveAtlasPlayer, LiveAtlasPlayerImageSize} from "@/index";

const headCache = new Map<string, HTMLImageElement>(),
	headUnresolvedCache = new Map<string, Promise<HTMLImageElement>>(),
	headsLoading = new Set<string>(),

	headQueue: HeadQueueEntry[] = [];

export const titleColoursRegex = /§[0-9a-f]/ig;
export const netherWorldNameRegex = /_?nether(_|$)/i;
export const endWorldNameRegex = /(^|_)end(_|$)/i;

export const getMinecraftTime = (serverTime: number) => {
	const day = serverTime >= 0 && serverTime < 13700;

	return {
		serverTime: serverTime,
		days: Math.floor((serverTime + 8000) / 24000),

		// Assuming it is day at 6:00
		hours: (Math.floor(serverTime / 1000) + 6) % 24,
		minutes: Math.floor(((serverTime / 1000) % 1) * 60),
		seconds: Math.floor(((((serverTime / 1000) % 1) * 60) % 1) * 60),

		day: day,
		night: !day
	};
}

export const getImagePixelSize = (imageSize: LiveAtlasPlayerImageSize) => {
	switch(imageSize) {
		case 'large':
		case 'body':
			return 32;

		case 'small':
		default:
			return 16;
	}
}

export const getMinecraftHead = (player: LiveAtlasPlayer | string, size: LiveAtlasPlayerImageSize): Promise<HTMLImageElement> => {
	const account = typeof  player === 'string' ? player : player.name,
		uuid = typeof  player === 'string' ? undefined : player.uuid,
		cacheKey = `${account}-${size}`;

	if(headCache.has(cacheKey)) {
		return Promise.resolve(headCache.get(cacheKey) as HTMLImageElement);
	}

	if(headUnresolvedCache.has(cacheKey)) {
		return headUnresolvedCache.get(cacheKey) as Promise<HTMLImageElement>;
	}

	const promise = new Promise((resolve, reject) => {
		const faceImage = new Image();

		faceImage.onload = function() {
			headCache.set(cacheKey, faceImage);
			headsLoading.delete(cacheKey);
			tickHeadQueue();
			resolve(faceImage);
		};

		faceImage.onerror = function(e) {
			console.warn(`Failed to retrieve face of ${account} with size ${size}!`);
			headsLoading.delete(cacheKey);
			tickHeadQueue();
			reject(e);
		};

		headQueue.push({
			name: account,
			uuid,
			size,
			cacheKey,
			image: faceImage,
		});
	}).finally(() => headUnresolvedCache.delete(cacheKey)) as Promise<HTMLImageElement>;

	headUnresolvedCache.set(cacheKey, promise);
	tickHeadQueue();

	return promise;
}

const tickHeadQueue = () => {
	if(headsLoading.size > 8 || !headQueue.length) {
		return;
	}

	const head = headQueue.pop() as HeadQueueEntry;

	headsLoading.add(head.cacheKey);
	head.image.src = useStore().state.currentMapProvider!.getPlayerHeadUrl(head);

	tickHeadQueue();
}

export const parseUrl = (url: URL) => {
	const query = new URLSearchParams(url.search),
		hash = url.hash.replace('#', '');

	return hash ? parseMapHash(hash) : parseMapSearchParams(query);
}

export const parseMapHash = (hash: string) => {
	const parts = hash.replace('#', '').split(';');

	const world = parts[0] || undefined,
		map = parts[1] || undefined,
		location = (parts[2] || '').split(',')
			.map(item => parseFloat(item))
			.filter(item => !isNaN(item) && isFinite(item)),
		zoom = typeof parts[3] !== 'undefined' ? parseInt(parts[3]) : undefined;

	return validateParsedUrl({
		world,
		map,
		location: location.length === 3 ? {
			x: location[0],
			y: location[1],
			z: location[2],
		} : undefined,
		zoom,
		legacy: false,
	});
}

export const parseMapSearchParams = (query: URLSearchParams) => {
	const world = query.get('worldname') /* Dynmap */ || query.get('world') /* Pl3xmap */ || undefined,
		map = query.has('worldname') ? query.get('mapname') || undefined : undefined, //Dynmap only
		location = [
			query.get('x') || '',
			query.get('y') || '64',
			query.get('z') || ''
		].map(item => parseFloat(item)).filter(item => !isNaN(item) && isFinite(item)),
		zoom = query.has('zoom') ? parseInt(query.get('zoom') as string) : undefined;

	return validateParsedUrl({
		world,
		map,
		location: location.length === 3 ? {
			x: location[0],
			y: location[1],
			z: location[2],
		} : undefined,
		zoom,
		legacy: true,
	});
}

const validateParsedUrl = (parsed: any) => {
	if(typeof parsed.zoom !== 'undefined' && (isNaN(parsed.zoom) || parsed.zoom < 0 || !isFinite(parsed.zoom))) {
		parsed.zoom = undefined;
	}

	if(!parsed.world) {
		return null;
	}

	return parsed;
}

export const getUrlForLocation = (map: LiveAtlasMapDefinition, location: {
	x: number,
	y: number,
	z: number }, zoom: number): string => {
	const x = Math.round(location.x),
			y = Math.round(location.y),
			z = Math.round(location.z),
			locationString = `${x},${y},${z}`;

		if(!map) {
			return '';
		}

		return `#${map.world.name};${map.name};${locationString};${zoom}`;
}

export const focus = (selector: string) => {
	const element = document.querySelector(selector);

	if(element) {
		(element as HTMLElement).focus();
	}
}

const decodeTextarea = document.createElement('textarea');

export const decodeHTMLEntities = (text: string) => {
	decodeTextarea.innerHTML = text;
	return decodeTextarea.textContent || '';
}