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const { src, dest, series } = require('gulp');

const rename = require('gulp-rename');

const del = require('del');

const { config } = require('../package.json');

/*

 * Typical PreProcessor workflow

 * Reads files from /src/ directory, runs processes, and outputs to /dist/ directory

 *

 * Pass in a `rename` option to rename the processed files

 * Pass in a `cleanup` parameter to remove unnecessary files

 */

function makeTask(opts) {

  const { key, pipe = [] } = opts;

  function runTask() {

    // Gather the files from the entry directory (dir)

    src(

      opts.src.map((file) => config.srcDir + file),

      {

        sourcemaps: config.sourcemaps

      }

    ).pipe(dest(config.distDir)); // Copy to the Dist dir

    const filesToModify = src(

      opts.src.map((file) => config.distDir + file),

      {

        sourcemaps: config.sourcemaps

      }

    ); // Make sure we include any additional files from the dist dir

    const pipes = pipe.map((processor) => {

      const fn = require(processor.require);

      return fn.apply(null, processor.args);

    });

    if (opts.rename) {

      pipes.push(makeRename(opts.rename));

    }

    // Pipe the files through the all of the task's functions

    return (

      pipes

        .reduce((stream, processor) => {

          return stream.pipe(processor);

        }, filesToModify)

        // Pipe the output to the destination

        .pipe(

          dest(config.distDir, {

            sourcemaps: '.'

          })

        )

    );

  }

  runTask.displayName = key;

  if (opts.cleanup) {

    return series(runTask, makeCleanup(opts));

  }

  return runTask;

}

/*

 * Rename files in the pipeline.

 */

function makeRename(opts) {

  // Find & replace of the basename if `find` option passed in

  if (opts.find) {

    return rename(function (path) {

      path.basename = path.basename.replace(opts.find, opts.replace);

    });

  }

  return rename(opts);

}

/*

 * Delete unnecessary files in the /dist/ directory

 */

function makeCleanup(opts) {

  function runCleanup(done) {

    const filesToDelete = Array.isArray(opts.cleanup) ? opts.cleanup : opts.src;

    del.sync(filesToDelete.map((file) => config.distDir + file));

    done();

  }

  runCleanup.displayName = 'cleanup:' + opts.key;

  return runCleanup;

}

module.exports = {

  makeTask

};

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