const fastGlob = require('fast-glob')

module.exports = function EsbuildPluginImportGlob({ importMapper = (path) => path }) {
  return {
    name: 'require-context',
    setup: (build) => {
      build.onResolve({ filter: /\*/ }, async ({ path, resolveDir }) => {
        if (resolveDir === '') {
          return // Ignore unresolvable paths
        }

        return {
          path: `${resolveDir}|${path}`,
          namespace: 'import-glob',
          pluginData: {
            path,
            resolveDir,
          },
        }
      })

      build.onLoad({ filter: /.*/, namespace: 'import-glob' }, async ({ pluginData: { resolveDir, path } }) => {
        const files = (
          await fastGlob(importMapper(path), {
            cwd: resolveDir,
          })
        ).sort()

        if (!files.length) {
          console.warn(`Warning: ${path} (in ${resolveDir}) did not match any files!`)
        }

        const importerCode = `
          ${files
            .map((module, index) => `import * as module${index} from '${module}'`)
            .join(';')}

          const modules = [${files
            .map((_module, index) => `module${index}`)
            .join(',')}];

          export default modules;
          export const filenames = [${files
            .map((module) => `'${module}'`)
            .join(',')}]
        `

        return { contents: importerCode, resolveDir }
      })
    },
  }
}