module.exports = function (grunt) {
    "use strict";

    grunt.initConfig({
        clean: ["./dist", "./tmp"],
        copy: {
            build: {
                files: [{
                    expand: true,
                    cwd: "./src",
                    src: ["**/license*"],
                    dest: "dist/",
                    filter: 'isFile'
                }]
            }
        }
    });

    grunt.loadNpmTasks('grunt-contrib-clean');
    grunt.loadNpmTasks("grunt-contrib-copy");
    grunt.loadNpmTasks('grunt-file-append');

    grunt.registerTask("add-rename-lua-module-tasks", "Finds and adds tasks to rename all main.lua to match their parent directory", function () {
        grunt.file.expand({filter: 'isDirectory'}, "src/*").forEach(function (dir) {
            var module_name = dir.substr(dir.lastIndexOf('/') + 1);
            if (module_name !== 'lib') {
                var copy_task = {};
                try {
                    copy_task = grunt.config.get('copy');
                } catch (exception) {
                    console.log("No copy config exists, generating empty one.");
                }
                copy_task[module_name] = {
                    src: [dir + '/**/main.lua'],
                    dest: 'dist/' + module_name + '/' + module_name + '.lua'
                };
                console.log("Added copy task for module [" + module_name + "]");
                grunt.config.set('copy', copy_task);
            }
        });
    });

    grunt.registerTask("minify-lua-modules", "minifies lua modules", function () {
        var fs = require('fs');
        var luamin = require('luamin');
        grunt.file.expand({filter: 'isDirectory'}, "dist/*").forEach(function (dir) {
            grunt.file.expand({filter: 'isFile'}, dir + "/*.lua").forEach(function (file) {
                var directory = file.substr(0, file.lastIndexOf('/'));
                var file_name = file.substr(file.lastIndexOf('/') + 1, file.lastIndexOf('.'));
                var lua = fs.readFileSync(file, 'utf8');
                var minified = luamin.minify(lua);
                var minified_file_name = file_name + '.min.lua';
                fs.writeFileSync(directory + '/' + minified_file_name, minified);
                console.log("Minified:  " + file_name + ' -> ' + minified_file_name);
            });
        });
    });

    grunt.registerTask("default", [
        "clean",
        "add-rename-lua-module-tasks",
        "copy",
        "minify-lua-modules"
    ]);
};