// BUG Symlink not working

var gulp = require('gulp');
var debug = require('gulp-debug');
var plugins = require('gulp-load-plugins')();
var del = require('del');
var es = require('event-stream');
var bowerFiles = require('main-bower-files');
var print = require('gulp-print');
var Q = require('q');
var imagemin = require('gulp-imagemin'), pngquant = require('imagemin-pngquant');
var taskListing = require('gulp-task-listing');
var symlink = require('gulp-sym');
var rename = require("gulp-rename");

// addon for Foundation6
var router   = require('front-router');

// == PATH STRINGS ========
var appdir  = "./app/";   // Warning to not forget trailling '/'
config=require (appdir + "etc/_Config"); // upload user local preferences if any

// Run node in debug mode in developpement mode ?
var nodeopts = config.DEBUG !== undefined ? '--debug='+config.DEBUG : ''; 
var frontend= appdir + config.FRONTEND;
var backend = appdir + config.BACKEND;

var paths = {
    application : frontend,
    scripts     : frontend+'/**/*.js',
    appStyles   : [frontend+'/**/*.scss', '!'+frontend+'/styles/*/*-conf.scss'],
    globalStyles: [frontend+'/styles/**/*.scss'],
    images      : [frontend+'/**/*.png',frontend+'/**/*.jpg',frontend+'/**/*.jpeg',frontend+'/**/*.svg',frontend+'/**/*.ttf'],
    index       : frontend+'/index.html',
    partials    : [frontend + '/**/*.html', '!' + frontend +'/index.html'],
    distDev     : './dist.dev',
    distProd    : './dist.prod',
    scriptsDevServer: backend + '/**/*.js',
    sass:  [frontend+'/styles', 'bower_components/foundation-apps/scss','bower_components/foundation-icon-fonts'],
    fonts: ['bower_components/**/*.woff'],
    favicon: frontend+'/favicon.ico'
};

paths['distAppDev']  = paths.distDev + config.URLBASE;
paths['distAppProd'] = paths.distProd + config.URLBASE;

// Run node in debug mode in developpement mode ?
var nodeopts = config.DEBUG !== undefined ? '--debug='+config.DEBUG : ''; 

// == PIPE SEGMENTS ========
var pipes = {};

pipes.orderedVendorScripts = function() {
    return plugins.order(['jquery.js', 'angular.js']);
};

pipes.orderedAppScripts = function() {
    return plugins.angularFilesort();
};

pipes.minifiedFileName = function() {
    return plugins.rename(function (path) {
        path.extname = '.min' + path.extname;
    });
};

pipes.validatedAppScripts = function() {
    return gulp.src(paths.scripts)
        .pipe(plugins.replace('@@APPNAME@@', config.APPNAME))
        .pipe(plugins.jshint())
        .pipe(plugins.jshint.reporter('jshint-stylish'));
};

pipes.builtAppScriptsDev = function() {
    return pipes.validatedAppScripts()
        .pipe(gulp.dest(paths.distAppDev));
};

pipes.builtAppScriptsProd = function() {
    var scriptedPartials = pipes.scriptedPartials();
    var validatedAppScripts = pipes.validatedAppScripts();

    return es.merge(scriptedPartials, validatedAppScripts)
        .pipe(plugins.ngAnnotate())
        .pipe(pipes.orderedAppScripts())
        .pipe(plugins.sourcemaps.init())
        .pipe(plugins.concat(config.APPNAME+'.min.js'))
        .pipe(plugins.uglify({compress: {drop_console: true}}))
        .pipe(plugins.sourcemaps.write())
        .pipe(gulp.dest(paths.distAppProd));
};

pipes.builtVendorScriptsDev = function() {
    return gulp.src(bowerFiles())
        .pipe(gulp.dest( paths.distDev +'/bower_components'));
};

pipes.builtVendorScriptsProd = function() {
    return gulp.src(bowerFiles('**/*.js'))
        .pipe(pipes.orderedVendorScripts())
        .pipe(plugins.concat('vendor.min.js'))
        .pipe(plugins.uglify())
        .pipe(gulp.dest(paths.distProd+ '/bower_components'));
};

pipes.validatedDevServerScripts = function() {
    return gulp.src(paths.scriptsDevServer)
        .pipe(plugins.jshint())
        .pipe(plugins.jshint.reporter('jshint-stylish'));
};

pipes.validatedPartials = function() {
    return gulp.src(paths.partials)
        .pipe(plugins.htmlhint({'doctype-first': false}))
        .pipe(router({path: paths.application+'/etc/routes.js', root: paths.application}))
        .pipe(plugins.htmlhint.reporter());
};

pipes.builtPartialsDev = function() {
    return pipes.validatedPartials()
        .pipe(gulp.dest(paths.distAppDev));
};

pipes.scriptedPartials = function() {
    return pipes.validatedPartials()
        .pipe(plugins.htmlhint.failReporter())
        .pipe(plugins.htmlmin({collapseWhitespace: true, removeComments: true}))
        .pipe(plugins.ngHtml2js({
            moduleName: config.APPNAME,
            template: "(function() {"
               + "angular.module('<%= moduleName %>').run(['$templateCache', function($templateCache) {"
               + "$templateCache.put('<%= template.url %>',\n    '<%= template.escapedContent %>');"
               + "}]);\n"
               + "})();\n"
        }));    
};

pipes.builtAppStylesDev = function() {
    return gulp.src(paths.appStyles)
        .pipe(plugins.sass({includePaths: paths.sass}))
        .pipe(gulp.dest(paths.distAppDev + '/styles'));
};

pipes.builtglobalStylesDev = function() {
    return gulp.src(paths.globalStyles)
        .pipe(plugins.sass({includePaths: paths.sass}))
        .pipe(gulp.dest(paths.distDev  + '/global_styles'));
};

pipes.builtAppStylesProd = function() {
    return gulp.src(paths.appStyles)
        .pipe(plugins.sourcemaps.init())
        .pipe(plugins.sass({includePaths: frontend + '/styles'}))
        // .pipe(debug({title: '***** appStyle:'}))
        .pipe(plugins.minifyCss())
        .pipe(plugins.concat(config.APPNAME+'.css'))
        .pipe(plugins.sourcemaps.write())
        .pipe(pipes.minifiedFileName())
        .pipe(gulp.dest(paths.distAppProd));
};

pipes.builtglobalStylesProd = function() {
    return gulp.src(paths.globalStyles)
        .pipe(plugins.sourcemaps.init())
        .pipe(plugins.sass({includePaths: paths.sass}))
        .pipe(plugins.minifyCss())
        .pipe(plugins.sourcemaps.write())
        .pipe(pipes.minifiedFileName())
        .pipe(rename(function (path) {path.dirname="";return path;}))
        .pipe(gulp.dest(paths.distProd + '/global_styles'));
};

pipes.processedFontsDev = function() {
    return gulp.src(paths.fonts)
        .pipe(rename(function (path) {path.dirname="";return path;}))
        .pipe(gulp.dest(paths.distDev+'/bower_components'));
};

pipes.processedFontsProd = function() {
    return gulp.src(paths.fonts)
        .pipe(rename(function (path) {path.dirname="";return path;}))
        .pipe(gulp.dest(paths.distProd+'/bower_components'));
};


pipes.processedImagesDev = function() {
    return gulp.src(paths.images)
        .pipe(gulp.dest(paths.distAppDev));
};

pipes.processedFaviconDev = function() {
    return gulp.src(paths.favicon)
        .pipe(gulp.dest(paths.distDev));
};

pipes.processedImagesProd = function() {
    return gulp.src(paths.images)
       .pipe(imagemin({
            progressive: true,
            svgoPlugins: [{removeViewBox: false}],
            use: [pngquant()]
        }))
        .pipe(gulp.dest(paths.distAppProd));
};

pipes.processedFaviconProd = function() {
    return gulp.src(paths.favicon)
        .pipe(gulp.dest(paths.distProd));
};

// Create an Symlink when config.URLBASE exist
pipes.createDevSymLink = function() {
    return gulp.src(paths.distDev).pipe(symlink(paths.distDev+config.URLBASE, {force: true}));
};

pipes.createProdSymLink = function() {
    return gulp.src(paths.distProd).pipe(symlink(paths.distDev+config.URLBASE,{force: true}));
};

pipes.validatedIndex = function() {
    return gulp.src(paths.index)       
        .pipe(plugins.replace('@@APPNAME@@', config.APPNAME))
        .pipe(plugins.replace('@@URLBASE@@', config.URLBASE))
        .pipe(plugins.htmlhint())
        .pipe(plugins.htmlhint.reporter());
};

pipes.builtIndexDev = function() {

    var orderedVendorScripts = pipes.builtVendorScriptsDev()
        .pipe(pipes.orderedVendorScripts());

    var orderedAppScripts = pipes.builtAppScriptsDev()
        .pipe(pipes.orderedAppScripts());

    var appStyles    = pipes.builtAppStylesDev();
    var globalStyles = pipes.builtglobalStylesDev();

    return pipes.validatedIndex()
         // Vendor and Global should have absolute path to rootdir application one are relative to BaseURL
        .pipe(plugins.inject(orderedVendorScripts, {relative: false, ignorePath: "/dist.dev", name: 'bower'}))
        .pipe(plugins.inject(globalStyles, {relative: false, ignorePath: "/dist.dev", name:'vendor'}))
        .pipe(gulp.dest(paths.distAppDev)) // write first to get relative path for inject
        .pipe(plugins.inject(orderedAppScripts, {relative: true}))
        .pipe(plugins.inject(appStyles, {relative: true, name: 'appli'}))
        .pipe(gulp.dest(paths.distAppDev));
};

pipes.builtIndexProd = function() {

    var vendorScripts= pipes.builtVendorScriptsProd();
    var appScripts   = pipes.builtAppScriptsProd();
    var appStyles    = pipes.builtAppStylesProd();
    var globalStyles = pipes.builtglobalStylesProd();

    return pipes.validatedIndex()
         // Vendor and Global should have absolute path to rootdir application one are relative to BaseURL
        .pipe(plugins.inject(vendorScripts, {relative: false, ignorePath: "/dist.prod", name: 'bower'}))
        .pipe(plugins.inject(globalStyles, {relative: false, ignorePath: "/dist.prod", name:'vendor'}))
        .pipe(gulp.dest(paths.distAppProd)) // write first to get relative path for inject
        .pipe(plugins.inject(appScripts, {relative: true}))
        .pipe(plugins.inject(appStyles, {relative: true, name:'appli'}))
        .pipe(plugins.htmlmin({collapseWhitespace: true, removeComments: true}))
        .pipe(gulp.dest(paths.distAppProd));
};

pipes.builtAppDev = function() {
    return es.merge(pipes.builtIndexDev(), pipes.builtPartialsDev(), pipes.processedFaviconDev(), pipes.processedImagesDev(), pipes.processedFontsDev() );
};

pipes.builtAppProd = function() {
    return es.merge(pipes.builtIndexProd(), pipes.processedFaviconProd(), pipes.processedImagesProd(), pipes.processedFontsProd());
};


// == TASKS ========

// Add a task to render the output 
gulp.task('help', taskListing.withFilters(/-/));
   
// clean, build of production environement
gulp.task('build', ['clean-build-app-prod', 'validate-devserver-scripts']);

gulp.task('run', function() {
    // start nodemon to auto-reload the dev server
    plugins.nodemon({ script: 'server.js', ext: 'js', watch: ['devServer/']})
        .on('change', ['validate-devserver-scripts'])
        .on('restart', function () {
            console.log('[nodemon] restarted dev server');
        });
});       

// removes all compiled dev files
gulp.task('clean-dev', function() {
    var deferred = Q.defer();
    del(paths.distDev, function() {
        deferred.resolve();
    });
    return deferred.promise;
});

// removes all compiled production files
gulp.task('clean-prod', function() {
    var deferred = Q.defer();
    del(paths.distProd, function() {
        deferred.resolve();
    });
    return deferred.promise;
});

// checks html source files for syntax errors
gulp.task('validate-partials', pipes.validatedPartials);

// checks index.html for syntax errors
gulp.task('validate-index', pipes.validatedIndex);

// moves html source files into the dev environment
gulp.task('build-partials-dev', pipes.builtPartialsDev);

// converts partials to javascript using html2js
gulp.task('convert-partials-to-js', pipes.scriptedPartials);

// runs jshint on the dev server scripts
gulp.task('validate-devserver-scripts', pipes.validatedDevServerScripts);

// runs jshint on the app scripts
gulp.task('validate-app-scripts', pipes.validatedAppScripts);

// moves app scripts into the dev environment
gulp.task('build-app-scripts-dev', pipes.builtAppScriptsDev);

// concatenates, uglifies, and moves app scripts and partials into the prod environment
gulp.task('build-app-scripts-prod', pipes.builtAppScriptsProd);

// compiles app sass and moves to the dev environment
gulp.task('build-app-styles-dev', pipes.builtAppStylesDev);

// compiles and minifies app sass to css and moves to the prod environment
gulp.task('build-app-styles-prod', pipes.builtAppStylesProd);

// moves vendor scripts into the dev environment
gulp.task('build-vendor-scripts-dev', pipes.builtVendorScriptsDev);

// concatenates, uglifies, and moves vendor scripts into the prod environment
gulp.task('build-vendor-scripts-prod', pipes.builtVendorScriptsProd);

// validates and injects sources into index.html and moves it to the dev environment
gulp.task('build-index-dev', pipes.builtIndexDev);

// validates and injects sources into index.html, minifies and moves it to the dev environment
gulp.task('build-index-prod', pipes.builtIndexProd);

// builds a complete dev environment
gulp.task('build-app-dev', pipes.builtAppDev);

// builds a complete prod environment
gulp.task('build-app-prod', pipes.builtAppProd);

// cleans and builds a complete dev environment
gulp.task('clean-build-app-dev', ['clean-dev'], pipes.builtAppDev);

// cleans and builds a complete prod environment
gulp.task('clean-build-app-prod', ['clean-prod'], pipes.builtAppProd);

// clean, build, and watch live changes to the dev environment
gulp.task('watch-dev', ['clean-build-app-dev', 'validate-devserver-scripts'], function() {

    // start nodemon to auto-reload the dev server
    plugins.nodemon({  exec: 'node ' + nodeopts, script: backend+'/server.js', ext: 'js', watch: [backend], env: {NODE_ENV : 'dev'} })
        .on('change', ['validate-devserver-scripts'])
        .on('restart', function () {
            console.log('[nodemon] restarted dev server');
        });

    // start live-reload server
    plugins.livereload.listen({ start: true });

    // watch index
    gulp.watch(paths.index, function() {
        return pipes.builtIndexDev()
            .pipe(plugins.livereload());
    });

    // watch app scripts
    gulp.watch(paths.scripts, function() {
        return pipes.builtAppScriptsDev()
            .pipe(plugins.livereload());
    });

    // watch html partials
    gulp.watch(paths.partials, function() {
        return pipes.builtPartialsDev()
            .pipe(plugins.livereload());
    });
    
    // watch Images
    gulp.watch(paths.images, function() {
        return pipes.processedImagesDev()
            .pipe(plugins.livereload());
    });

    // watch styles
    gulp.watch(paths.appStyles, function() {
        return pipes.builtAppStylesDev()
            .pipe(plugins.livereload());
    });

});

// clean, build, and watch live changes to the prod environment
gulp.task('watch-prod', ['clean-build-app-prod', 'validate-devserver-scripts'], function() {

    // start nodemon to auto-reload the dev server
    plugins.nodemon({ script: backend +'/server.js', ext: 'js', watch: [backend], env: {MODE : 'prod'} })
        .on('change', ['validate-devserver-scripts'])
        .on('restart', function () {
            console.log('[nodemon] restarted dev server');
        });

    // start live-reload server
    plugins.livereload.listen({start: true});

    // watch index
    gulp.watch(paths.index, function() {
        return pipes.builtIndexProd()
            .pipe(plugins.livereload());
    });

    // watch app scripts
    gulp.watch(paths.scripts, function() {
        return pipes.builtAppScriptsProd()
            .pipe(plugins.livereload());
    });

    // watch hhtml partials
    gulp.watch(paths.partials, function() {
        return pipes.builtAppScriptsProd()
            .pipe(plugins.livereload());
    });
    
    // watch Images
    gulp.watch(paths.images, function() {
        return pipes.processedImagesProd()
            .pipe(plugins.livereload());
    });

    // watch styles
    gulp.watch(paths.appStyles, function() {
        return pipes.builtAppStylesProd()
            .pipe(plugins.livereload());
    });
    
});

// default task builds for prod
gulp.task('default', ['clean-build-app-prod']);