/** Gruntfile - control build and deploy tasks
 */

var _ = require('underscore');

module.exports = function(grunt) {

    // TASKS

    grunt.registerTask('default', ['compile']);
    grunt.registerTask('compile', ['jshint:lint-sources'
                                  ,'htmlhint:lint'
                                  ,'coffeelint:lint'
                                  ,'less:compile'
                                  ,'usebanner:generated-css'
                                  ,'coffee:compile'
                                  ,'usebanner:generated-js'
                                  ,'jshint:lint-generated'
                                  //,'amd-check' // too smart about plugins, r.js can't find them
                                  ]);
    grunt.registerTask('build', ['clean:build'
                                ,'copy:build'
                                ,'dojo:build'
                                ]);
    grunt.registerTask('deploy', []);

    // FILES AND FOLDERS
    
    var srcDir   = 'src/';
    var buildDir = 'build/';
    var coffeeMap = grunt.file.expandMapping(
        [ 'client/qed-client/**/*.coffee', 'server/**/*.coffee' ],
        srcDir,
        { cwd: srcDir, ext: '.js' });
    var lessMap = grunt.file.expandMapping(
        [ 'client/qed-client/css/qed.less' ],
        srcDir,
        { cwd: srcDir, ext: '.css' });

    // TASK CONFIG
    
    grunt.initConfig({
        'amd-check': {
            files: [ srcDir+'client/qed-client/**/*.js' ]
        },
        clean: {
            build: { src: [buildDir] }
        },
        coffee: {
            options: { bare: true },
            compile: { files: coffeeMap }
        },
        coffeelint: {
            lint: { options: require('./'+srcDir+'.coffeelint.json'),
                    files: coffeeMap }
        },
        copy: {
            build: { files: [{ expand: true,
                               cwd: srcDir,
                               src: ['**', '!client/*/**' ],
                               dest: buildDir }]}
        },
        dojo: {
            build: { options: { dojo: srcDir+'client/dojo/dojo.js',
                                profile: srcDir+'client/client.profile.js',
                                releaseDir: '../../../'+buildDir }}
        },
        htmlhint: {
            options: { htmlhintrc: srcDir+".htmlhintrc" },
            lint: { files: [{ expand: true,
                              cwd: srcDir,
                              src: ['client/*.html', 'client/qed-client/**/*.html'] }]}
        },
        jshint: {
            'lint-sources': { options: { jshintrc: srcDir+".jshintrc" },
                              files: { src: [ srcDir+'client/qed-client/**/*.js', srcDir+'server/**/*.js' ].concat(exclude(dest(coffeeMap))) }},
            'lint-generated': { options: { jshintrc: srcDir+".jshintrc-generated" },
                                files: { src: dest(coffeeMap) }}
        },
        less: {
            options: { strictImports: false,
                       dumpLineNumbers: "all" },
            compile: { files: lessMap }
        },
        requirejs: {
            basePath: srcDir+'client/',
            packages: [
                { name: "dojo", location: "dojo" },
                { name: "dijit", location: "dijit" },
                { name: "dojox", location: "dojox" },
                { name: "qed-client", location: "qed-client" }
            ]
        },
        usebanner: {
            'generated-css': { options: { position: 'top',
                                          banner: '/* This CSS file is generated. All edits will be lost on recompile. */'},
                               files: { src: dest(lessMap) }},
            'generated-js': { options: { position: 'top',
                                         banner: '/* This JS file is generated, All edits will be lost on recompile. */'},
                               files: { src: dest(coffeeMap) }}
        }
    });

    // LOAD TASKS

    grunt.loadNpmTasks('grunt-amd-check');
    grunt.loadNpmTasks('grunt-banner');
    grunt.loadNpmTasks('grunt-coffeelint');
    grunt.loadNpmTasks('grunt-contrib-clean');
    grunt.loadNpmTasks('grunt-contrib-coffee');
    grunt.loadNpmTasks('grunt-contrib-copy');
    grunt.loadNpmTasks('grunt-contrib-jshint');
    grunt.loadNpmTasks('grunt-contrib-less');
    grunt.loadNpmTasks('grunt-dojo');
    grunt.loadNpmTasks('grunt-htmlhint');
    grunt.loadTasks('./grunt-tasks');

    // UTIL FUNCTIONS

    function dest(files) {
        return _.chain(files)
            .map(function(item){ return item.dest; })
            .flatten()
            .value();
    }

    function exclude(dest) {
        return _.map(dest, function(dest){ return '!'+dest; });
    }
    
};