import path from 'path';
import pluginVue from '@vitejs/plugin-vue';
import { defineConfig } from 'vite';

import locales from '../../locales';
import meta from '../../package.json';
import pluginJson5 from './vite.json5';

const extensions = ['.ts', '.tsx', '.js', '.jsx', '.mjs', '.json', '.json5', '.svg', '.sass', '.scss', '.css', '.vue'];

const hash = (str: string, seed = 0): number => {
	let h1 = 0xdeadbeef ^ seed,
		h2 = 0x41c6ce57 ^ seed;
	for (let i = 0, ch; i < str.length; i++) {
		ch = str.charCodeAt(i);
		h1 = Math.imul(h1 ^ ch, 2654435761);
		h2 = Math.imul(h2 ^ ch, 1597334677);
	}
	
	h1 = Math.imul(h1 ^ (h1 >>> 16), 2246822507) ^ Math.imul(h2 ^ (h2 >>> 13), 3266489909);
	h2 = Math.imul(h2 ^ (h2 >>> 16), 2246822507) ^ Math.imul(h1 ^ (h1 >>> 13), 3266489909);
	
	return 4294967296 * (2097151 & h2) + (h1 >>> 0);
};

const BASE62_DIGITS = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
function toBase62(n: number): string {
	if (n === 0) {
		return '0';
	}
	let result = ''; 
	while (n > 0) {
		result = BASE62_DIGITS[n % BASE62_DIGITS.length] + result;
		n = Math.floor(n / BASE62_DIGITS.length);
	}
	
	return result;
}

export default defineConfig(({ command, mode }) => {
	return {
		base: '/vite/',

		plugins: [
			pluginVue({
				reactivityTransform: true,
			}),
			pluginJson5(),
		],

		resolve: {
			extensions,
			alias: {
				'@/': __dirname + '/src/',
				'/client-assets/': __dirname + '/assets/',
				'/static-assets/': __dirname + '/../backend/assets/',
			},
		},

		css: {
			modules: {
				generateScopedName: (name, filename, css) => {
					if (process.env.NODE_ENV === 'production') {
						return 'x' + toBase62(hash(`${filename} ${name}`)).substring(0, 4);
					} else {
						//return 'x' + toBase62(hash(`${filename} ${name}`)).substring(0, 4) + '-' + name;
						return (path.relative(__dirname, filename.split('?')[0]) + '-' + name).replace(/[\\\/\.\?&=]/g, '-').replace(/(src-|vue-)/g, '');
					}
				},
			},
		},

		define: {
			_VERSION_: JSON.stringify(meta.version),
			_LANGS_: JSON.stringify(Object.entries(locales).map(([k, v]) => [k, v._lang_])),
			_ENV_: JSON.stringify(process.env.NODE_ENV),
			_DEV_: process.env.NODE_ENV !== 'production',
			_PERF_PREFIX_: JSON.stringify('Misskey:'),
			_DATA_TRANSFER_DRIVE_FILE_: JSON.stringify('mk_drive_file'),
			_DATA_TRANSFER_DRIVE_FOLDER_: JSON.stringify('mk_drive_folder'),
			_DATA_TRANSFER_DECK_COLUMN_: JSON.stringify('mk_deck_column'),
			__VUE_OPTIONS_API__: true,
			__VUE_PROD_DEVTOOLS__: false,
		},

		build: {
			target: [
				'chrome108',
				'firefox109',
				'safari16',
			],
			manifest: 'manifest.json',
			rollupOptions: {
				input: {
					app: './src/init.ts',
				},
				output: {
					manualChunks: {
						vue: ['vue'],
					},
				},
			},
			cssCodeSplit: true,
			outDir: __dirname + '/../../built/_vite_',
			assetsDir: '.',
			emptyOutDir: false,
			sourcemap: process.env.NODE_ENV === 'development',
			reportCompressedSize: false,
		},
	};
});
