import esbuild from "esbuild";
import process from "process";
import builtins from "builtin-modules";
import { readFileSync } from "fs";
import { join } from 'path';

const banner =
`/*
THIS IS A GENERATED/BUNDLED FILE BY ESBUILD
if you want to view the source, please visit the github repository of this plugin
*/
`;

const prod = (process.argv[2] === "production");

const wasmPlugin = {
    name: 'wasm',
    setup(build) {
        build.onResolve({ filter: /\.wasm$/ }, args => {
            if (args.resolveDir === '') return;
            return {
                path: join(args.resolveDir, args.path),
                namespace: 'wasm-binary',
            };
        });

        build.onLoad({ filter: /\.wasm$/, namespace: 'wasm-binary' }, async (args) => {
            const contents = readFileSync(args.path);
            const wasmBase64 = contents.toString('base64');
            
            return {
                contents: `
                    const wasmBase64 = "${wasmBase64}";
                    const wasmBinary = Uint8Array.from(atob(wasmBase64), c => c.charCodeAt(0));
                    export default wasmBinary;
                `,
                loader: 'js',
            };
        });
    },
};

const context = await esbuild.context({
	banner: {
		js: banner,
	},
	entryPoints: ["main.ts"],
	bundle: true,
	external: [
		"obsidian",
		"electron",
		"@codemirror/autocomplete",
		"@codemirror/collab",
		"@codemirror/commands",
		"@codemirror/language",
		"@codemirror/lint",
		"@codemirror/search",
		"@codemirror/state",
		"@codemirror/view",
		"@lezer/common",
		"@lezer/highlight",
		"@lezer/lr",
		...builtins],
	format: "cjs",
	target: "es2018",
	logLevel: "info",
	sourcemap: prod ? false : "inline",
	treeShaking: true,
	outfile: "main.js",
	plugins: [
		wasmPlugin
	],
	minify: prod,
});

if (prod) {
	await context.rebuild();
	process.exit(0);
} else {
	await context.watch();
}