#!/usr/bin/env deno

import { Manifest } from "../types.ts";
import { YAML } from "../../../dep_common.ts";
import { compile, esbuild, sandboxCompileModule } from "../compile.ts";
import { path } from "../../../dep_server.ts";

import * as flags from "https://deno.land/std@0.158.0/flags/mod.ts";

async function bundle(
  manifestPath: string,
  debug: boolean,
  excludeModules: string[],
) {
  const rootPath = path.dirname(manifestPath);
  const manifest = YAML.parse(
    await Deno.readTextFile(manifestPath),
  ) as Manifest<any>;

  if (!manifest.name) {
    throw new Error(`Missing 'name' in ${manifestPath}`);
  }

  const allModulesToExclude = excludeModules.slice();

  for (let [name, moduleSpec] of Object.entries(manifest.dependencies || {})) {
    manifest.dependencies![name] = await sandboxCompileModule(moduleSpec);
    allModulesToExclude.push(name);
  }

  for (let [name, def] of Object.entries(manifest.functions || {})) {
    let jsFunctionName = "default",
      filePath = path.join(rootPath, def.path!);
    if (filePath.indexOf(":") !== -1) {
      [filePath, jsFunctionName] = filePath.split(":");
    }

    def.code = await compile(
      filePath,
      jsFunctionName,
      debug,
      allModulesToExclude,
      false,
    );
    delete def.path;
  }
  return manifest;
}

async function buildManifest(
  manifestPath: string,
  distPath: string,
  debug: boolean,
  excludeModules: string[],
) {
  const generatedManifest = await bundle(manifestPath, debug, excludeModules);
  const outFile = manifestPath.substring(
    0,
    manifestPath.length - path.extname(manifestPath).length,
  ) + ".json";
  const outPath = path.join(distPath, path.basename(outFile));
  console.log("Emitting bundle to", outPath);
  await Deno.writeTextFile(outPath, JSON.stringify(generatedManifest, null, 2));
  return { generatedManifest, outPath };
}

type BundleArgs = {
  _: string[];
  dist?: string;
  debug?: boolean;
  exclude?: string[] | string;
};

export async function run(args: BundleArgs) {
  console.log("Args", args);

  async function buildAll() {
    Deno.mkdirSync(args.dist!, { recursive: true });
    for (const plugManifestPath of args._) {
      const manifestPath = plugManifestPath as string;
      try {
        await buildManifest(
          manifestPath,
          args.dist!,
          !!args.debug,
          args.exclude as string[],
        );
      } catch (e) {
        console.error(`Error building ${manifestPath}:`, e);
      }
    }
  }

  await buildAll();
  // if (args.watch) {
  //   console.log("Watching for changes...");
  //   for await (const event of Deno.watchFs(".", {
  //     recursive: true,
  //   })) {
  //     if (
  //       event.filename.endsWith(".plug.yaml") ||
  //       filename.endsWith(".js") ||
  //       filename.endsWith(".css") ||
  //       filename.endsWith(".png") ||
  //       filename.endsWith(".jpg") ||
  //       filename.endsWith(".gif") ||
  //       (filename.endsWith(".ts") && !filename.endsWith("_in.ts"))
  //     ) {
  //       console.log("Change detected", eventType, filename);
  //       await buildAll();
  //     }
  //   }
  // }
}

if (import.meta.main) {
  let args: BundleArgs = flags.parse(Deno.args);

  if (args._.length === 0) {
    console.log(
      "Usage: plugos-bundle [--debug] [--dist <path>] [--exclude=package1,package2] <manifest.plug.yaml> <manifest2.plug.yaml> ...",
    );
    Deno.exit(1);
  }

  if (!args.dist) {
    args.dist = path.resolve("dist");
  }

  args.exclude = typeof args.exclude === "string"
    ? args.exclude.split(",")
    : [];

  await run(args);
  esbuild.stop();
}