var gulp = require('gulp');
var sass = require('gulp-sass');
var less = require('gulp-less');
var prefix = require('gulp-autoprefixer');
var jade = require('gulp-jade');
var clean = require('gulp-clean');
var uglify = require('gulp-uglify');
var copy = require('gulp-copy');
var jade = require('gulp-jade');
// var fontmin = require('gulp-fontmin');
var replace = require('gulp-replace');
var eventStream = require('event-stream');
var requirejs = require('requirejs');
var argv = require('yargs').argv;

/**
 * ------------------------------------------------------------------------
 * Usage:
 *
 * ```shell
 * ./nodule_modules/.bin/gulp release --env asf
 * ./nodule_modules/.bin/gulp release --env echartsjs
 * ./nodule_modules/.bin/gulp release --env dev # the same as "debug"
 * # Check `./config` to see the available env
 *
 * ./nodule_modules/.bin/gulp sourceVersion
 * ```
 * ------------------------------------------------------------------------
 */

function initEnv() {
    var envType = argv.env;
    var isDev = argv.dev != null || argv.debug != null || envType === 'debug';
    var notNeedEnv = (argv._ || [])[0] === 'sourceVersion';

    if (isDev) {
        console.warn('=============================');
        console.warn('!!! THIS IS IN DEV MODE !!!');
        console.warn('=============================');
        envType = 'dev';
    }
    if (notNeedEnv) {
        envType = 'asf';
    }

    if (!envType) {
        throw new Error('--env MUST be specified');
    }

    return require('./config/env.' + envType);
}

var config = initEnv();


// Update home version each build.
config.homeVersion = +new Date();

/**
 * Build files for release
 */
gulp.task('build', function () {
    gulp.run('jade');
    gulp.run('sass');
});

/**
 * Compile files from _scss into css
 */
gulp.task('sass', function () {
    return gulp.src('_scss/main.scss')
        .pipe(sass({
            includePaths: ['scss'],
            onError: function (e) {
                console.error(e);
            },
            outputStyle: 'compressed'
        }))
        .pipe(prefix(['last 15 versions', '> 1%', 'ie 8', 'ie 7'], {
            cascade: true
        }))
        .pipe(gulp.dest('css'));
});

/**
 * Ye, I think it's reasonable that both use less and sass in this project.
 */
gulp.task('less', function () {
    // FIXME: where to put css, when using lots of vendor components including css.
    return gulp.src([
            'js/docTool/ecOption.less',
            'js/spreadsheet/spreadsheet.less'
        ])
        .pipe(less({
            paths: ['vendors'],
            onError: function (e) {
                console.error(e);
            },
            outputStyle: 'compressed'
        }))
        .pipe(prefix(['last 15 versions', '> 1%', 'ie 8', 'ie 7'], {
            cascade: true
        }))
        .pipe(gulp.dest('css'));
});

/**
 * Update source code version
 */
gulp.task('sourceVersion', function () {
    // Replace version
    return gulp.src('builder/echarts.html')
        // .pipe(replace(/(urlArgs:\s*\'v=)([0-9rc\.-]+)\'/, '$1' + config.version + '\''))
        .pipe(replace(/(urlArgs:\s*\'v=)([0-9rc\.-]+)\'/, '$1' + config.homeVersion + '\''))
        .pipe(gulp.dest('builder/'));
});

/**
 * Generate site using Jade
 */
gulp.task('jade', function () {
    return gulp.src('_jade/**/*.jade')
        .pipe(jade({
            data: config
        }))
        .pipe(gulp.dest('.'));
});

/**
 * Watch scss files for changes & recompile
 * Watch html/md files
 */
gulp.task('watch', ['sass-copy', 'less', 'jade-copy', 'js-copy'], function () {
    gulp.watch('_scss/*.scss', ['sass-copy']);
    gulp.watch([
        'js/docTool/ecOption.less',
        'js/spreadsheet/spreadsheet.less'
    ], ['less']);
    gulp.watch(['_jade/**/*'], ['jade-copy']);
    gulp.watch(['js/*'], ['js-copy']);
});

gulp.task('jade-copy', ['jade'], function () {
    return gulp.src(['./*.html', 'zh/*.html', 'en/*.html'])
        .pipe(copy(config.releaseDestDir));
});

gulp.task('sass-copy', ['sass'], function () {
    return eventStream.merge(
        gulp.src('css/**').pipe(copy(config.releaseDestDir)),
        gulp.src('css/**').pipe(copy(config.releaseDestDir + '/en')),
        gulp.src('css/**').pipe(copy(config.releaseDestDir + '/zh'))
    );
});

gulp.task('js-copy', function () {
    return eventStream.merge(
        gulp.src('js/*.js').pipe(copy(config.releaseDestDir)),
        gulp.src('js/*.js').pipe(copy(config.releaseDestDir + '/en')),
        gulp.src('js/*.js').pipe(copy(config.releaseDestDir + '/zh'))
    );
})

// /**
//  * generate font file
//  */
// function minifyFont(text, cb) {
//     gulp
//         .src('_font/NotoSans*.ttf')
//         .pipe(fontmin({
//             text: text
//         }))
//         .pipe(gulp.dest('css/font'))
//         .on('end', cb);
// }

// gulp.task('fonts', ['jade'], function(cb) {

//     var buffers = [];

//     gulp
//         .src(['*.html', 'js/config.js', 'build/config.js'])
//         .on('data', function(file) {
//             buffers.push(file.contents);
//         })
//         .on('end', function() {
//             var text = Buffer.concat(buffers).toString('utf-8');
//             minifyFont(text, cb);
//         });

// });

/**
 * Default task, running just `gulp` will compile the sass.
 */
gulp.task('default', ['watch']);






// -------------------
// Release
// -------------------


gulp.task('release-clean', function () {
    // Do not clean ./release here, because
    // echarts-examples will copy their release to ./release/examples.
    return gulp.src([
        config.releaseDestDir + '/*.html'
    ], {
        read: false
    })
    .pipe(clean({
        force: true
    }));
});

gulp.task('release-docJS', ['release-clean'], function (taskReady) {
    requirejs.optimize(
        config.docToolConfig,
        function () {
            taskReady();
        },
        function (error) {
            console.error('requirejs task failed', error.message);
            process.exit(1);
        }
    );
});

gulp.task('release-spreadsheetJS', ['release-clean'], function (taskReady) {
    requirejs.optimize(
        config.spreadsheetConfig,
        function () {
            taskReady();
        },
        function (error) {
            console.error('requirejs task failed', error.message);
            process.exit(1);
        }
    );
});

gulp.task('release-otherJS', ['release-clean'], function () {
    return gulp.src(['js/*.js'])
        .pipe(uglify())
        .pipe(gulp.dest('release/js/'));
});

gulp.task('release-js', ['release-docJS', 'release-spreadsheetJS', 'release-otherJS']);

gulp.task('copy', ['sass', 'less', 'jade', 'release-js', 'release-clean'], function () {
    return gulp.src([
            './*.html', './vendors/**', './css/**', './documents/**', './blog/**',
            './js/docTool/*.html', './js/spreadsheet/*.html', './images/**', './asset/map/**', './asset/theme/**',
            './builder/**', './dist/**', './meeting/**', './share/**', './slides/**', './video/**',
            './config'
        ])
        .pipe(copy('release'));
});

gulp.task('release', ['copy'], function () {
    return eventStream.merge(
        gulp.src([
            'css/**/*', 'vendors/**/*', 'images/**/*', 'dist/**/*', 'builder/**/*', 'video/**/*',
            'documents/**/*', 'asset/**/*'
        ], {
            base: '.'
        })
            .pipe(gulp.dest(config.releaseDestDir + '/en'))
            .pipe(gulp.dest(config.releaseDestDir + '/zh'))
            .pipe(gulp.dest('../echarts-doc/public/en'))
            .pipe(gulp.dest('../echarts-doc/public/zh')),

        gulp.src([
            'release/js/**/*', 'release/documents/**/*'
        ], {
            base: 'release'
        })
            .pipe(gulp.dest(config.releaseDestDir))
            .pipe(gulp.dest(config.releaseDestDir + '/en'))
            .pipe(gulp.dest(config.releaseDestDir + '/zh'))
            .pipe(gulp.dest('../echarts-doc/public/en'))
            .pipe(gulp.dest('../echarts-doc/public/zh')),

        gulp.src(['en/*.html'])
            .pipe(gulp.dest(config.releaseDestDir + '/en'))
            .pipe(gulp.dest('../echarts-doc/public/en')),

        gulp.src(['zh/*.html'])
            .pipe(gulp.dest(config.releaseDestDir + '/zh'))
            .pipe(gulp.dest('../echarts-doc/public/zh')),

        gulp.src(['*.html'])
            .pipe(gulp.dest(config.releaseDestDir))
            .pipe(gulp.dest('../echarts-doc/public'))
    );
});