import path from 'path';
import { minify } from 'html-minifier';
import UglifyJS from 'uglify-js';

import wasmPlugin from './wasmPlugin';
import imagePlugin from './imagePlugin';
import fontPlugin from './fontPlugin';
import audioPlugin from './audioPlugin';
import filePlugin from './filePlugin';

import { getGames } from './isGame';

interface Args {
    production?: boolean;
    portable?: boolean;
    mobile?: boolean
}
export async function buildHTML(game: string, { production = false, portable = false, mobile = false }: Args = {}) {
    const html = await Bun.file(path.resolve(import.meta.dir, 'assets', 'index.html')).text();
    const bundle = await Bun.build({
        outdir: '/tmp',
        entrypoints: [path.resolve(import.meta.dir, '..', 'src', 'index.ts')],
        sourcemap: production ? 'none' : 'inline',
        define: {
            global: 'window',
            GAME: `"${game}"`,
            GAMES: JSON.stringify(await getGames()),
        },
        plugins: [
            imagePlugin,
            audioPlugin,
            fontPlugin,
            wasmPlugin({ production, portable }),
            filePlugin,
        ]
    });

    if (bundle.success) {
        const scriptFile = bundle.outputs.find(a => a.kind === 'entry-point' && a.path.endsWith('.js'));
        if (!scriptFile) {
            console.error('No entry point found:', bundle.outputs);
            return;            
        }
        const iconFile = Bun.file(path.resolve(import.meta.dir, '..', 'src', 'games', game, 'assets', 'favicon.ico'));
        let icon = '';
        if (await iconFile.exists()) {
            icon = `<link rel="icon" href="data:;base64,${Buffer.from(await iconFile.arrayBuffer()).toString('base64')}" />`;
        }
        let style = '';
        let styleFile = bundle.outputs.find(a => a.kind === 'asset' && a.path.endsWith('.css'));
        if (styleFile) {
            style = await styleFile.text();
        }
        let script = await scriptFile.text();
        const inits = new Set<string>();
        script = script.replace(/var (init_[^ ]+) = __esm\(\(\)/g, (_, $1) => {
            inits.add($1);
            return `var ${$1} = __esm(async ()`;
        });

        for (const init of inits) {
            script = script.replaceAll(`${init}()`, `await ${init}()`);
        }

        script = script.replaceAll('await Promise.resolve().then(() =>', '(');
        let scriptPrefix = '';
        if (production) {
            const minifyResult = UglifyJS.minify(script, {
                module: true,
            });
            if (minifyResult.error) {
                console.warn(`Minify error: ${minifyResult.error}`);
            } else {
                script = minifyResult.code;
            }
        } else if (mobile) {
            const eruda = await Bun.file(path.resolve(import.meta.dir, '..', 'node_modules', 'eruda', 'eruda.js')).text();
            scriptPrefix = `<script>${eruda};\neruda.init();</script>`;
        }

        const resultHTML = html
            .replace('<!--$SCRIPT$-->', () => `${scriptPrefix}<script type="module">${script}</script>`)
            .replace('<!--$TITLE$-->', game[0].toUpperCase() + game.slice(1).toLowerCase())
            .replace('<!--$ICON$-->', icon)
            .replace('/*$STYLE$*/', style);

        return minify(resultHTML, {
            collapseWhitespace: production,
            decodeEntities: true,
            minifyCSS: production,
            minifyJS: production,
        });
    } else {
        console.error('Failed: ', !bundle.success, bundle);
    }
}