var fs = require('fs');
var assert = require('assert');
var pug = require('../');
var uglify = require('uglify-js');
var mkdirp = require('mkdirp').sync;

var filters = {
  custom: function(str, options) {
    assert(options.opt === 'val');
    assert(options.num === 2);
    return 'BEGIN' + str + 'END';
  },
};

// test cases

function writeFileSync(filename, data) {
  try {
    if (fs.readFileSync(filename, 'utf8') === data.toString('utf8')) {
      return;
    }
  } catch (ex) {
    if (ex.code !== 'ENOENT') {
      throw ex;
    }
  }
  fs.writeFileSync(filename, data);
}

function findCases(dir) {
  return fs
    .readdirSync(dir)
    .filter(function(file) {
      return ~file.indexOf('.pug');
    })
    .map(function(file) {
      return file.replace('.pug', '');
    });
}

function testSingle(it, suffix, test) {
  var name = test.replace(/[-.]/g, ' ');
  it(name, function() {
    var path = __dirname + '/cases' + suffix + '/' + test + '.pug';
    var str = fs.readFileSync(path, 'utf8');
    var fn = pug.compile(str, {
      filename: path,
      pretty: true,
      basedir: __dirname + '/cases' + suffix,
      filters: filters,
      filterAliases: {markdown: 'markdown-it'},
    });
    var actual = fn({title: 'Pug'});

    writeFileSync(
      __dirname + '/output' + suffix + '/' + test + '.html',
      actual
    );

    var html = fs
      .readFileSync(
        __dirname + '/cases' + suffix + '/' + test + '.html',
        'utf8'
      )
      .trim()
      .replace(/\r/g, '');
    var clientCode = uglify.minify(
      pug.compileClient(str, {
        filename: path,
        pretty: true,
        compileDebug: false,
        basedir: __dirname + '/cases' + suffix,
        filters: filters,
        filterAliases: {markdown: 'markdown-it'},
      }),
      {
        output: {beautify: true},
        mangle: false,
        compress: false,
        fromString: true,
      }
    ).code;
    var clientCodeDebug = uglify.minify(
      pug.compileClient(str, {
        filename: path,
        pretty: true,
        compileDebug: true,
        basedir: __dirname + '/cases' + suffix,
        filters: filters,
        filterAliases: {markdown: 'markdown-it'},
      }),
      {
        output: {beautify: true},
        mangle: false,
        compress: false,
        fromString: true,
      }
    ).code;
    writeFileSync(
      __dirname + '/output' + suffix + '/' + test + '.js',
      uglify.minify(
        pug.compileClient(str, {
          filename: path,
          pretty: false,
          compileDebug: false,
          basedir: __dirname + '/cases' + suffix,
          filters: filters,
          filterAliases: {markdown: 'markdown-it'},
        }),
        {
          output: {beautify: true},
          mangle: false,
          compress: false,
          fromString: true,
        }
      ).code
    );
    if (/filter/.test(test)) {
      actual = actual.replace(/\n| /g, '');
      html = html.replace(/\n| /g, '');
    }
    if (/mixins-unused/.test(test)) {
      assert(
        /never-called/.test(str),
        'never-called is in the pug file for mixins-unused'
      );
      assert(
        !/never-called/.test(clientCode),
        'never-called should be removed from the code'
      );
    }
    expect(actual.trim()).toEqual(html);
    actual = Function('pug', clientCode + '\nreturn template;')()({
      title: 'Pug',
    });
    if (/filter/.test(test)) {
      actual = actual.replace(/\n| /g, '');
    }
    expect(actual.trim()).toEqual(html);
    actual = Function('pug', clientCodeDebug + '\nreturn template;')()({
      title: 'Pug',
    });
    if (/filter/.test(test)) {
      actual = actual.replace(/\n| /g, '');
    }
    expect(actual.trim()).toEqual(html);
  });
}

module.exports = {
  filters,
  findCases,
  testSingle,
};