import { exists } from "https://deno.land/std@0.97.0/fs/mod.ts";
import { build, stop } from 'https://deno.land/x/esbuild@v0.12.6/mod.js';
import type { BuildOptions, BuildResult } from 'https://deno.land/x/esbuild@v0.12.6/mod.js';
import { cache } from 'https://raw.githubusercontent.com/takker99/esbuild-plugin-cache/master/deno/mod.ts';

// 特定のpropertyを削るやつ
type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;

export async function run(filename: string, imports: {[key: string]: string}, {external, ...rest }: Omit<BuildOptions, 'entryPoints' | 'platform' | 'plugins'>) {
  let useTempFile = false;
  let result: BuildResult | undefined = undefined;
  try {
    if (/^https?:\/\//.test(filename)) {
      const tempname = `index-${Math.random()}.ts`;
      await Deno.writeTextFile(tempname, `import '${filename}';export * from '${filename}';`);
      filename = tempname;
      useTempFile = true;
    }
    const options: BuildOptions = {
      entryPoints: [filename],
      platform: 'neutral',
      plugins: [cache({directory: './cache', importmap: {imports}})],
      external: Array.isArray(external) ? external : (external ? [external] : []),
      ...rest
    };
    result = await build(options);
    stop();
  } catch(e) {
    throw e;
  }finally {
    //後始末
    if (useTempFile) await Deno.remove(filename);
    if (await exists('./cache')) await Deno.remove('./cache', { recursive: true });
  }
  return result;
}