var path = require('path');
var _ = require('lodash');

module.exports = function (grunt) {
	grunt.initConfig(
			{
				pkg: grunt.file.readJSON('package.json'),

				// Default values
				version: 'NEXT',
				name: 'preloadjs',

				// Setup doc names / paths.
				docsName: '<%= pkg.name %>_docs-<%= version %>',
				docsZip: "<%= docsName %>.zip",

				// Setup Uglify for JS minification.
				uglify: {
					options: {
						banner: grunt.file.read('LICENSE'),
						preserveComments: "some",
						compress: {
							global_defs: {
								"DEBUG": false
							}
						},
					},
					build: {
						files: {
							'output/<%= pkg.name.toLowerCase() %>-<%= version %>.min.js': getConfigValue('source'),
						}
					}
				},

				concat: {
					options: {
						separator: '',
						process: function(src, filepath) {
							// Remove a few things from each file, they will be added back at the end.

							// Strip the license header.
							var file = src.replace(/^(\/\*\s)[\s\S]+?\*\//, "");

							// Strip namespace (Breaks Preload, and maybe other libs, leaving out for now)
							// file = file.replace(/(this.createjs)\s*=\s*\1.*?(});?/, "");

							// Strip namespace label
							file = file.replace(/\/\/\s*namespace:/, "");

							// Strip @module
							file = file.replace(/\/\*\*[\s\S]+?@module[\s\S]+?\*\//, "");

							// Clean up white space
							file = file.replace(/^\s*/, "");
							file = file.replace(/\s*$/, "");

							// Append on the class name
							file =
								"\n\n//##############################################################################\n"+
								"// " + path.basename(filepath) + "\n" +
								"//##############################################################################\n\n"+
							  	file;

							return file;
						}
					},
					build: {
						files: {
							'output/<%= pkg.name.toLowerCase() %>-<%= version %>.combined.js': getCombinedSource()
						}
					}
				},

				// Build docs using yuidoc
				yuidoc: {
					compile: {
						name: '<%= pkg.name %>',
						version: '<%= version %>',
						description: '<%= pkg.description %>',
						url: '<%= pkg.url %>',
						logo: '<%= pkg.logo %>',
						options: {
							paths: ['./'],
							outdir: '<%= docsFolder %>',
							linkNatives: true,
							attributesEmit: true,
							selleck: true,
							helpers: ["../build/path.js"],
							themedir: "../build/createjsTheme/"
						}
					}
				},

				compress: {
					build: {
						options: {
							mode:'zip',
							archive:'output/<%= docsZip %>'
						},
						files: [
							{expand:true, src:'**', cwd:'<%= docsFolder %>'}
						]
					}
				},

				clean: {
				  docs: {
				    src: ["<%= docsFolder %>/assets/scss"]
				  }
				},

				copy: {
					docsZip: {
						files: [
							{expand: true, cwd:'output/', src:'<%= docsZip %>', dest:'../docs/'}
						]
					},
					docsSite: {
						files: [
							{expand:true, cwd:'<%= docsFolder %>', src:'**', dest:getConfigValue('docs_out_path')}
						]
					},
					src: {
						files: [
							{expand: true, cwd:'./output/', src: '*<%=version %>*.js', dest: '../lib/'}
						]
					}
				},

				updateversion: {
					preload: {
						file: '../src/preloadjs/version.js',
						version: '<%= version %>'
					}
				},

				clearversion: {
					preload: {
						file: '../src/preloadjs/version.js'
					}
				},

				sass: {
					docs: {
						options: {
							style: 'compressed',
							sourcemap:"none"
						},
						files: {
							'createjsTheme/assets/css/main.css': 'createjsTheme/assets/scss/main.scss'
						}
					}
				}
			}
	);

	function getBuildConfig() {
		// Read the global settings file first.
		var config = grunt.file.readJSON('config.json');

		// If we have a config.local.json .. prefer its values.
		if (grunt.file.exists('config.local.json')) {
			var config2 = grunt.file.readJSON('config.local.json');
			_.extend(config, config2);
		}

		return config;
	}

	function getConfigValue(name) {
		var config = grunt.config.get('buildConfig');

		if (config == null) {
			config = getBuildConfig();
			grunt.config.set('buildConfig', config);
		}

		return config[name];
	}

	function getCombinedSource() {
		var configs = [
			{cwd: '', config:'config.json', source:'source'}
		];

		return combineSource(configs);
	}

	function combineSource(configs) {
		// Pull out all the source paths.
		var sourcePaths = [];
		for (var i=0;i<configs.length;i++) {
			var o = configs[i];
			var json = grunt.file.readJSON(path.resolve(o.cwd, o.config));
			var sources = json[o.source];
			sources.forEach(function(item, index, array) {
				array[index] = path.resolve(o.cwd, item);
			});
			sourcePaths = sourcePaths.concat(sources);
		}

		// Remove duplicates (Like EventDispatcher)
		var dups = {};
		var clean = [];
		for (i=0;i<sourcePaths.length;i++) {
			var src = sourcePaths[i];
			var cleanSrc = src.substr(src.lastIndexOf('src' + path.sep));
			if  (dups[cleanSrc] == null) {
				clean.push(src);
				dups[cleanSrc] = true;
			}
		}

		return clean;
	}

	function getBuildArgs() {
		var banner = grunt.file.read("BANNER");
		grunt.config("concat.options.banner", banner);
	}

	// Load all the tasks we need
	grunt.loadNpmTasks('grunt-contrib-concat');
	grunt.loadNpmTasks('grunt-contrib-uglify');
	grunt.loadNpmTasks('grunt-contrib-yuidoc');
	grunt.loadNpmTasks('grunt-contrib-compress');
	grunt.loadNpmTasks('grunt-contrib-copy');
	grunt.loadNpmTasks('grunt-contrib-sass');
	grunt.loadNpmTasks('grunt-contrib-clean');
	grunt.loadTasks('tasks/');

	grunt.registerTask('exportScriptTags', function() {
		var source = grunt.option("path") || "";

		var config = getBuildConfig();
		var scripts = config.source;
		var tags = [];
		for (var i = 0; i < scripts.length; i++) {
			var script = '<script src="<%=src %>"></script>';
			var realPath = scripts[i].replace("../src/", "");
			tags.push(grunt.template.process(script, {data: {src: source + realPath}}));
		}
		console.log(tags.join("\n"));
	});

	grunt.registerTask('setDocsBase', "Internal utility task to set a correct base for YUIDocs.", function() {
		grunt.file.setBase('../src');
		grunt.config.set('docsFolder', "../build/output/<%= docsName %>/");
	});

	grunt.registerTask('resetBase', "Internal utility task to reset the base, after setDocsBase", function() {
		grunt.file.setBase('../build');
		grunt.config.set('docsFolder', "./output/<%= docsName %>/");
	});

	/**
	 * Build the docs using YUIdocs.
	 */
	grunt.registerTask('docs', [
		"sass", "setDocsBase", "yuidoc", "resetBase", "clean:docs", "compress", "copy:docsZip"
	]);

	/**
	 * Sets out version to the version in package.json (defaults to NEXT)
	 */
	grunt.registerTask('setVersion', function () {
		grunt.config.set('version', grunt.config.get('pkg').version);
	});

	/**
	 * Task for exporting a next build.
	 *
	 */
	grunt.registerTask('next', function() {
		grunt.config("buildArgs", this.args || []);
		getBuildArgs();
		grunt.task.run(["coreBuild", "clearBuildArgs"]);
	});

	/**
	 * Task for exporting only the next lib.
	 *
	 */
	grunt.registerTask('nextlib', [
		"updateversion", "combine", "uglify", "clearversion", "copy:src"
	]);

	/**
	 * Task for exporting a release build (version based on package.json)
	 *
	 */
	grunt.registerTask('build', function() {
		grunt.config("buildArgs", this.args || []);
		getBuildArgs();
		grunt.task.run(["setVersion", "coreBuild", "updatebower", "copy:docsSite", "clearBuildArgs"]);
	});

	grunt.registerTask('clearBuildArgs', function() {
		grunt.config("buildArgs", []);
	});

	/**
	 * Main build task, always runs after next or build.
	 *
	 */
	grunt.registerTask('coreBuild', [
		"updateversion", "combine", "uglify", "clearversion", "docs", "copy:src"
	]);

	/**
	 * Task for exporting combined view.
	 *
	 */
	grunt.registerTask('combine', 'Combine all source into a single, un-minified file.', [
		"concat"
	]);

};