const decompress = require('decompress');
const fs = require('fs');
const jsonfile = require('jsonfile');
const blockRemaps = 'mappings/blocks.json';
let blocks;
jsonfile.readFile(blockRemaps, function (err, obj) {
	if (err) console.error(err);
	blocks = obj;
});
const itemRemaps = 'mappings/items.json';
let items;
jsonfile.readFile(itemRemaps, function (err, obj) {
	if (err) console.error(err);
	items = obj;
});
let toConvertName;

try {
	toConvertName = process.argv[2];
	if (fs.existsSync(`input/${toConvertName}.zip`)) {
		convert(toConvertName);
	} else {
		console.log('Usage: npm start <pack name>');
	}
} catch (err) {
	console.log(err);
}

/**
* @param {string} input Name of resource pack zip file
*/

function convert(input) {
	const extractedPath = `out/${input}/assets/minecraft/textures/`;
	decompress(`input/${input}.zip`, `out/${input}`, {
		filter: file => !file.path.endsWith('/'),
	}).then(files => {
		files.forEach(element => {
			if (!element.path.includes('assets/minecraft/textures/')) {
				return;
			}
			const texture = element.path.match(/([A-Za-z]*)\/([A-Za-z]*)\/([A-Za-z_0-9]*)\.(png\.mcmeta|png)/);
			if (!texture) return;
			let type = texture[1];
			const subtype = texture[2];
			const name = texture[3];
			const extension = texture[4];
			let rename;
			if (type == 'textures') {
				type = subtype;
			}
			if (type == 'items') {
				rename = items[name];
			}
			if (type == 'blocks') {
				rename = blocks[name];
			}
			const path1 = `${extractedPath}${type}/`;
			if (rename) {
				try {
					fs.renameSync(`${path1}${name}.${extension}`, `${path1}${rename}.${extension}`);
					console.log(`Renamed ${name}.${extension} to ${rename}.${extension}`);
				} catch (error) {
					console.log(error);
				}
			}
		});
	}).then(() => {
		try {
			fs.renameSync(`${extractedPath}blocks`, `${extractedPath}block`);
			console.log(`Renamed ${extractedPath}blocks to ${extractedPath}block`);
		} catch (error) {
			console.log(error);
		}
		try {
			fs.renameSync(`${extractedPath}items`, `${extractedPath}item`);
			console.log(`Renamed ${extractedPath}items to ${extractedPath}item`);
		} catch (error) {
			console.log(error);
		}
		jsonfile.readFile(`out/${input}/pack.mcmeta`, function (err, obj) {
			if (err) console.error(err);
			const oldFormat = obj.pack.pack_format;
			const newFormat = 15;
			obj.pack.pack_format = newFormat;
			jsonfile.writeFile(`out/${input}/pack.mcmeta`, obj, { spaces: 2 }, function (err) {
				if (err) console.error(err);
				console.log(`Pack format changed from ${oldFormat} to ${newFormat}`);
			});
		});
	});
}