module.exports = function(grunt) {
    "use strict";
    // Configuration
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),
        compass: {
            config: 'config.rb'
        },
        jshint: {
            options: {
                strict: true
            },
            all:['GruntFile.js','src/js/*.js']
        },
        uglify: {
            options: {
                sourceMap: function(script){
                    return 'src/source_maps/' + script + '.map';
                },
                sourceMapRoot: '/carson/',
                sourceMappingURL: function(script) {
                    //return '../src/source_maps/' + script.replace(/^.+\//, "") + '.map';
                    return '../src/source_maps/' + script + '.map';
                }
            },
            src: {
                files: [{
                    expand: true,
                    cwd: 'src/js/',
                    src: ['**/*.js'],
                    dest: 'js/',
                    //ext: '.min.js',    //commenting out for now
                }]
            },
            jqueryTouchSwipe: {
                files: {
                    'js/jquery.touchSwipe.js': 'bower_components/jquery-touchswipe/jquery.touchSwipe.js'
                }
            },
            modernizr: {
                files: [{                   // Dictionary of files
                    expand: true,           // Enable dynamic expansion.
                    cwd: 'bower_components/modernizr',         // Src matches are relative to this path.
                    src: ['**/*.js'],      // Actual pattern(s) to match.
                    dest: 'js/',           // Destination path prefix.
                    ext: '.js'         // Dest filepaths will have this extension.
                }]
            },
            respond: {
                files: [{                   // Dictionary of files
                    expand: true,           // Enable dynamic expansion.
                    cwd: 'bower_components/respond',         // Src matches are relative to this path.
                    src: ['**/*.js'],      // Actual pattern(s) to match.
                    dest: 'js/',           // Destination path prefix.
                    ext: '.js'         // Dest filepaths will have this extension.
                }]
            }
        },
        copy: {
            all: {
                files: [{
                    expand: true,
                    cwd: 'src/raster',
                    src: ['**/*.jpg', '**/*.png'],
                    dest: 'img/',
                }]
            }
        },
        svgmin: {                                           // Task
            options: {                                      // Configuration that will be passed directly to SVGO
                plugins: [{
                    removeViewBox: false
                }]
            },
            all: {                                         // Target
                files: [{                   // Dictionary of files
                    expand: true,           // Enable dynamic expansion.
                    cwd: 'src/svg',         // Src matches are relative to this path.
                    src: ['**/*.svg'],      // Actual pattern(s) to match.
                    dest: 'img/',           // Destination path prefix.
                    //ext: '.svg'         // Dest filepaths will have this extension.
                }]
            }
        },
        svg2png: {                                           // Task
            all: {                                         // Target
                files: [{                   // Dictionary of files
                    expand: true,           // Enable dynamic expansion.
                    //cwd: 'src/svg'        // Do not use, svg2png applies the cwd to the dest folder as well
                    src: ['src/svg/**/*.svg'],      // Actual pattern(s) to match.
                    dest: 'img/'           // Destination path prefix.
                }]
            },
        },
        smushit: {
            path: {
                src: 'img/'
            }
        },
        watch: {
            options: {
                nospawn: true
            },
            js: {
                files: ['src/js/**/*.js'],
                tasks: ['uglify:src']
            },
            copy: {
                files: ['src/raster/**/*.jpg', 'src/raster/**/*.png'],
                tasks: ['copy', 'smushit']
            },
            svg: {
                files: ['src/svg/**/*.svg'],
                tasks: ['svgmin']
            },
            smushit: {
                files: ['img/**/*.png', 'img/**/*.jpg'],
                tasks: ['smushit']
            },
            sass: {
                files: ['src/sass/**/*.scss'],
                tasks: ['compass'],
                options: {
                    nospawn: true
                }
            }
        }

    });
    // Plugins
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.loadNpmTasks('grunt-contrib-jshint');
    grunt.loadNpmTasks('grunt-contrib-uglify');
    grunt.loadNpmTasks('grunt-contrib-compass');
    grunt.loadNpmTasks('grunt-contrib-copy');
    grunt.loadNpmTasks('grunt-svgmin');
    grunt.loadNpmTasks('grunt-svg2png');
    grunt.loadNpmTasks('grunt-smushit');

    // Tasks
    grunt.registerTask('default',['jshint','uglify']);
    grunt.registerTask('vector',['svgmin']);
    grunt.registerTask('png',['svg2png', 'smushit']);
    grunt.registerTask('raster',['copy', 'smushit']);
    grunt.registerTask('image',['vector', 'svg2png', 'raster']);
    grunt.event.on('watch', function(action, filepath, target) {
        //change the ource and destination in the uglify task at run time so that it affects the changed file only
        var destFilePath; 
        if(target == "js") {
            destFilePath = filepath.replace(/src\/(.+)$/, '$1');
            grunt.config('uglify.src.src', filepath);
            grunt.config('uglify.src.dest', destFilePath);
        } else if(target == "copy") {
            destFilePath = filepath.replace(/src\/raster\/(.+)$/, 'img/$1');
            grunt.config('copy.all.src', filepath);
            grunt.config('copy.all.dest', destFilePath);
            grunt.config('smushit.path.src', destFilePath);
        } else if (target == "svg") {
            destFilePath = filepath.replace(/src\/svg\/(.+)$/, 'img/$1');
            grunt.config('svgmin.all.src', filepath);
            grunt.config('svgmin.all.dest', destFilePath);
        } else if (target == "smushit") {
            grunt.config('smushit.path.src', filepath);
        }
    });
};