import { build, stop } from 'esbuild'
import { join } from 'std/path/mod.ts'

import envPlugin from '../esbuild/env_plugin.js'
import resolvePlugin from '../esbuild/resolve_plugin.js'

export default async (cwd, entrypoint) => {
  const railsEnv = Deno.env.get('RAILS_ENV')
  const isProd = railsEnv === 'production'

  let entrypointIsSourcemap = false
  if (/\.jsx\.map$/.test(entrypoint)) {
    entrypoint = entrypoint.replace(/\.map$/, '')
    entrypointIsSourcemap = true
  }

  const params = {
    entryPoints: [entrypoint],
    absWorkingDir: cwd,
    logLevel: 'error',
    sourcemap: !entrypointIsSourcemap ? false : 'linked',
    outdir: 'public',
    outbase: './',
    write: false,
    format: 'esm',
    minify: isProd,
    bundle: true,
    // jsxFactory: 'createElement',
    // jsxFragment: 'Fragment',
    plugins: [envPlugin(), resolvePlugin({ debug: false })]
  }

  if (entrypoint.endsWith('.jsx')) {
    try {
      const stat = Deno.lstatSync(join(cwd, 'lib/react_shim.js'))
      if (stat.isFile) {
        params.inject = ['./lib/react_shim.js']
      }
    } catch {
      // Safe to swallow as this should only throw if file does not exist.
      // TODO: print warning to user
    }
  }

  try {
    const result = await build(params)

    if (params.sourcemap === 'linked') {
      if (entrypointIsSourcemap) {
        return result.outputFiles[0].contents
      } else {
        return result.outputFiles[1].contents
      }
    } else {
      return result.outputFiles[0].contents
    }
  } finally {
    stop()
  }
}