/* Rollup Riot.js Plugin, @license MIT */
'use strict';

var compiler = require('@riotjs/compiler');
var pluginutils = require('@rollup/pluginutils');

const justExt = (file) => {
  const match = /[^/\\]\.([^./\\]*)$/.exec(file);
  return match ? match[1] : ''
};

function getFilter(opts) {
  const filter = pluginutils.createFilter(opts.include, opts.exclude);

  const exts = Array.isArray(opts.ext) ? opts.ext : [opts.ext || 'riot'];
  if (!exts.length) {
    return filter
  }

  exts.forEach((e, i, arr) => {
    if (e[0] === '.') {
      arr[i] = e.substr(1);
    }
  });

  return (name) => filter(name) && exts.indexOf(justExt(name)) > -1
}

/* eslint-disable fp/no-delete */

function riot(options) {
  // clone options
  options = Object.assign({}, options);

  const filter = getFilter(options)

  // drop properties not necessary for Riot compiler
  ;['ext', 'include', 'parsers', 'sourcemap'].forEach((key) => {
    delete options[key];
  });

  return {
    transform(src, id) {
      if (!filter(id)) {
        return null
      }

      const { code, map } = compiler.compile(src, {
        file: id,
        ...options,
      });

      return { code, map }
    },
  }
}

module.exports = riot;