const autogeneratedBridgetownConfig = {
  "source": "src",
  "destination": "output",
  "componentsDir": "_components",
  "islandsDir": "_islands"
}

const path = require("path")
const glob = require("glob")

// Glob plugin derived from:
// https://github.com/thomaschaaf/esbuild-plugin-import-glob
// https://github.com/xiaohui-zhangxh/jsbundling-rails/commit/b15025dcc20f664b2b0eb238915991afdbc7cb58
const importGlobPlugin = (bridgetownConfig) => ({
  name: "import-glob",
  setup: (build) => {
    build.onResolve({ filter: /\*/ }, async (args) => {
      if (args.resolveDir === "") {
        return; // Ignore unresolvable paths
      }

      const adjustedPath = args.path
        .replace(/^\$components\/\*\*/, `../${bridgetownConfig.source}/${bridgetownConfig.componentsDir}/**`)
        .replace(/^bridgetownComponents\//, `../${bridgetownConfig.source}/${bridgetownConfig.componentsDir}/`) // legacy

      return {
        path: adjustedPath,
        namespace: "import-glob",
        pluginData: {
          path: adjustedPath,
          resolveDir: args.resolveDir,
        },
      }
    })

    build.onLoad({ filter: /.*/, namespace: "import-glob" }, async (args) => {
      const files = glob.sync(args.pluginData.path, {
        cwd: args.pluginData.resolveDir,
      })
        .sort()
        .map(module => module.replace(`../${bridgetownConfig.source}/${bridgetownConfig.componentsDir}/`, "$components/"))
        .map(module => module.match(/^[a-zA-Z0-9]/) ? `./${module}` : module)

      const importerCode = `
        ${files
          .map((module, index) => `import * as module${index} from '${module}'`)
          .join(';')}
        const modules = {${files
          .map((module, index) => `
            "${module.replace("$components/", "")}": module${index},`)
          .join("")}
        };
        export default modules;
      `

      return { contents: importerCode, resolveDir: args.pluginData.resolveDir }
    })
  },
})

const bridgetownConfigured = (bridgetownConfig) => {
  return {...autogeneratedBridgetownConfig, ...bridgetownConfig}
}

module.exports = (esbuildOptions) => {
  const bridgetownConfig = bridgetownConfigured(esbuildOptions.bridgetownConfig)

  let inputData = [];

  process.stdin.resume();
  process.stdin.setEncoding('utf8');

  process.stdin.on('data', data => {
    inputData.push(data)
  })

  process.stdin.on('end', () => {
    const inputValues = JSON.parse(inputData.join())

    esbuildOptions.plugins = esbuildOptions.plugins || []
    esbuildOptions.plugins.unshift(importGlobPlugin(bridgetownConfig))

    if (esbuildOptions.bridgetownConfig) delete esbuildOptions.bridgetownConfig

    require('esbuild').build({
      ...esbuildOptions,
      stdin: {
        contents: inputValues.code,
        resolveDir: process.cwd(),
        sourcefile: 'lit-ssr-output.js' // imaginary file
      },
      platform: "node",
      inject: [path.join(__dirname, "server", "import-meta-url-shim.js")],
      define: { "import.meta.url": "import_meta_url" },
      bundle: true,
      write: false,
    }).then(result => {
      process.stdout.write(result.outputFiles[0].text)
    }).catch(_e => { })
  })
}