'use strict';

var jsonTransform = require('../');
var Promise = require('promise');

var should = require('should');
require('mocha');

var gutil = require('gulp-util');
var fs = require('fs');
var path = require('path');

var jshint = require('jshint');

describe('gulp-json-transform', function () {

	var testTransform = function (inputFile, transformFn, expected) {
		var inputJson = new gutil.File({
			path: 'test/fixtures/' + inputFile,
			cwd: 'test/',
			base: 'test/fixtures',
			contents: fs.readFileSync('test/fixtures/' + inputFile)
		});

		return function (done) {
			var stream = jsonTransform(transformFn);

			stream.on('error', function(err) {
				should.exist(err);
				done(err);
			});

			stream.on('data', function (newFile) {
				should.exist(newFile);
				should.exist(newFile.contents);
				var newFilePath = path.resolve(newFile.path);
				var expectedFilePath = path.resolve('test/fixtures/' + inputFile);
				newFilePath.should.equal(expectedFilePath);
				newFile.relative.should.equal(inputFile);
				String(newFile.contents).should.equal(expected);
				Buffer.isBuffer(newFile.contents).should.equal(true);
				done();
			});

			stream.write(inputJson);
			stream.end();
		};
	};

	it('should transform a json file to a json file', testTransform('input.json', function(data) {
		return {foobar: data.foo + data.bar};
	}, '{"foobar":"[foo][bar]"}'));

  it('should transform a json file to a text file', testTransform('input.json', function(data) {
		return data.foo + data.bar;
	}, '[foo][bar]'));

  it('should accept the file as a parameter to the transform function', testTransform('input.json', function(data, file) {
		var fileProps = ['path', 'relative', 'base'];
		for (var fileProp in file) {
			if (file.hasOwnProperty(fileProp)) {
				var index = fileProps.indexOf(fileProp);
				should.ok(index >= 0, 'file object has illegal property: ' + fileProp);
				if (index >= 0) {
				  fileProps.splice(index, 1);
				}
			}
		}
		should.ok(fileProps.length === 0, 'file object is missing properties: ' + JSON.stringify(fileProps));

		return file.relative + ' - ' + data.foo + data.bar;
	}, 'input.json - [foo][bar]'));

  it('should accept promises', testTransform('input.json', function(data) {
		return Promise.resolve(data.foo + data.bar);
	}, '[foo][bar]'));
});