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

var _ = require('underscore');

module.exports = function(grunt) {

    // TASKS

    // default task
    grunt.registerTask('default', ['compile']);
    // development
    grunt.registerTask('compile',
                       "Lint all sources and compile Coffee and LESS sources.",
                       ['path-check:svn'
                       ,'svn-ignore:compile'
                       ,'jshint:lint-sources'
                       ,'htmlhint:lint'
                       ,'coffeelint:lint'
                       ,'jsonlint:lint'
                     //,'tv4: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('run',
                       "Compile and start the server locally with foreman.",
                       ['path-check:foreman'
                       ,'compile'
                       ,'foreman:run-src']);
    grunt.registerTask('build',
                       "Compile and make a Dojo build of the client (compress sources).",
                       ['compile'
                       ,'clean:build'
                       ,'copy:build'
                       ,'dojo:build'
                       ]);
    grunt.registerTask('run-build',
                       "Make a build and start server from build locally with foreman.",
                       ['path-check:foreman'
                       ,'build'
                       ,'foreman:run-build']);
    grunt.registerTask('deploy',
                       "Make a build and deploy it to Heroku.",
                       ['path-check:svn'
                       ,'path-check:git'
                       ,'svninfo'
                       ,'build'
                       ,'git_deploy:deploy-build']);
    grunt.registerTask('deploy-src',
                       "Deploy sources to Heroku (FOR DEBUGGING ONLY).",
                       ['path-check:svn'
                       ,'path-check:git'
                       ,'svninfo'
                       ,'compile'
                       ,'git_deploy:deploy-src']);
    // database management
    grunt.registerTask('db-backup-cloud-to-dated-local',
                       "Backup the Heroku database to a timestamped local database.",
                       ['path-check:heroku'
                       ,'heroku-config'
                       ,'http:db-backup-cloud-to-dated-local']);
    grunt.registerTask('db-pull-cloud-to-local',
                       "Synchronize local database with the Heroku database (pull changes).",
                       ['path-check:heroku'
                       ,'heroku-config'
                       ,'http:db-pull-cloud-to-local']);
    grunt.registerTask('db-push-local-to-cloud',
                       "Synchronize the Heroku database with the local database (push changes).",
                       ['path-check:heroku'
                       ,'heroku-config'
                       ,'http:db-push-local-to-cloud']);
    grunt.registerTask('#',
                       "---\nTASKS BELOW ARE INTERNAL AND SHOULD NOT USUALLY BE CALLED FROM THE COMMAND-LINE\n---",
                       []);

    // 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' });

    var mode = process.env.QED_ENV || 'dev';
    var dbNames = {
        dev: 'qed-dev',
        production: 'qed'
    };
    if ( !( mode in dbNames ) ) {
        throw new Error("Unknown mode "+mode+" specified.");
    }

    // TASK CONFIG

    grunt.initConfig({
        localDbURL: "http://localhost:5984",
        dbName: dbNames[mode],
        timestamp: "<%= grunt.template.today(\"UTC:yyyymmdd't'HHMMss'z'\") %>",

        '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 }}
        },
        foreman: {
            'run-src': {
                options: {
                    cwd: srcDir
                }
            },
            'run-build': {
                options: {
                    cwd: buildDir
                }
            }
        },
        git_deploy: {
            'deploy-build': {
                options: {
                    url: 'git@heroku.com:quod-erat.git',
                    branch: 'master',
                    message: "Build deployment of revision <%= svninfo.rev %> on <%= grunt.template.today() %>."
                },
                src: buildDir
            },
            
            'deploy-src': {
                options: {
                    url: 'git@heroku.com:quod-erat.git',
                    branch: 'master',
                    message: "Source deployment of revision <%= svninfo.rev %> on <%= grunt.template.today() %>."
                },
                src: srcDir
            }
        },
        'heroku-config': {
            options: {
                app: 'quod-erat',
                keys: ['CLOUDANT_URL']
            }
        },
        htmlhint: {
            options: { htmlhintrc: srcDir+".htmlhintrc" },
            lint: { files: [{ expand: true,
                              cwd: srcDir,
                              src: ['client/*.html', 'client/qed-client/**/*.html'] }]}
        },
        http: {
            'db-backup-cloud-to-dated-local': {
                options: {
                    url: "<%= localDbURL %>/_replicate",
                    method: 'POST',
                    body: {
                        source: "<%= herokuConfig.CLOUDANT_URL %>/<%= dbName %>",
                        target: "<%= dbName %>-<%= timestamp %>",
                        create_target: true
                    },
                    json: true
                }
            },
            'db-pull-cloud-to-local': {
                options: {
                    url: "<%= localDbURL %>/_replicate",
                    method: 'POST',
                    body: {
                        source: "<%= herokuConfig.CLOUDANT_URL %>/<%= dbName %>",
                        target: "<%= dbName %>",
                        create_target: true
                    },
                    json: true
                }
            },
            'db-push-local-to-cloud': {
                options: {
                    url: "<%= localDbURL %>/_replicate",
                    method: 'POST',
                    body: {
                        source: "<%= dbName %>",
                        target: "<%= herokuConfig.CLOUDANT_URL %>/<%= dbName %>",
                        create_target: true
                    },
                    json: true
                }
            }
        },
        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) } }
        },
        jsonlint: {
            'lint': { files: { src: [ srcDir+'client/qed-client/**/*.json', srcDir+'server/**/*.json' ] } }
        },
        less: {
            options: { strictImports: false,
                       dumpLineNumbers: "all" },
            compile: { files: lessMap }
        },
        'path-check': {
            'heroku': {
                src: ['heroku']
            },
            'foreman': {
                src: ['foreman']
            },
            'svn': {
                src: ['svn']
            },
            'git': {
                src: ['git']
            }
        },
        requirejs: {
            basePath: srcDir+'client/',
            packages: [
                { name: "dojo", location: "dojo" },
                { name: "dijit", location: "dijit" },
                { name: "dojox", location: "dojox" },
                { name: "qed-client", location: "qed-client" }
            ]
        },
        'svn-ignore': {
            compile: {
                files: { src: dest(coffeeMap).concat(dest(lessMap)) }
            }
        },
        'svn-ignore-clean': {
            clean: {
                files: [{
                    expand: true,
                    cwd: srcDir,
                    src: ['**', '!node_modules/**', '!client/dojo/**', '!client/dijit/**', '!client/dojox/**', '!client/util/**'],
                    filter: 'isDirectory'
                }]
            }
        },
        tv4: {
            lint: {
                options: {
                    root: grunt.file.readJSON('json-schema-draft-04.json'),
                    multi: true
                },
                src: [srcDir+'server/config/couchdb-schema.json']
            }
        },
        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-git-deploy');
    grunt.loadNpmTasks('grunt-htmlhint');
    grunt.loadNpmTasks('grunt-http');
    grunt.loadNpmTasks('grunt-jsonlint');
    grunt.loadNpmTasks('grunt-path-check');
    grunt.loadNpmTasks('grunt-svninfo');
    grunt.loadNpmTasks('grunt-tv4');
    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; });
    }
    
};