var package = require('./package.json'),
    support = require("./build-support.js"),
    BUILD = require("./build.json"),
    get = function(name) {
        if (BUILD.includes[name].p) {
            // the new way, with libs from npm
            return BUILD.includes[name].p;
        } else {
            return "lib/" + BUILD.includes[name].f + "-" + BUILD.includes[name].v + ".js";
        }
    },
    objects = {
        common:[
            'util.js', 'browser-util.js', 'lists.js', 'jsplumb.js', 'overlay-component.js', 'endpoint.js', 'connection.js', 'anchors.js', 'defaults.js', 'group.js'
        ]
    },
    optionList = function(grunt, type) {
        return grunt.option(type) && grunt.option(type).split(",") || [];
    },
    getOutputFilename = function(grunt, suffix) {
        var suffix2 = grunt.option('outputSuffix') ? ('.' + grunt.option("outputSuffix")) : '';
        return 'dist/js/jsplumb' + suffix2 + suffix + '.js';
    },
    filter = function(l, v, t, o) {
        if (l.length === 0 || l.indexOf(v) != -1)
            o.push("src/" + t + "-" + v + ".js");
    },
    getList = function(grunt, type) {
        var ol = optionList(grunt, type), l = BUILD[type], out = [];
        for (var i = 0; i < l.length; i++)
            filter(ol, l[i], type, out);

        return out;
    },
    getSources = function(grunt) {
        var sources =  BUILD.coreLibs.map(get);

        sources.push.apply(sources, BUILD.browserLibs.map(get));

        sources.push.apply(sources, objects.common.map(function(v) { return "src/" + v; }));
        sources.push.apply(sources, getList(grunt, "connectors"));
        //sources.push.apply(sources, ["svg"]);
        sources.push.apply(sources, getList(grunt, "renderers"));
        sources.push("src/dom.jsplumb.js");
        return sources;
    },
    help = "\nBuilding jsPlumb\n" +
           "-----------------\n" +
           "To build jsPlumb, execute the 'build' task:\n\n" +
           "--> grunt build\n\n" +
           "this will, by default, build a version of jsPlumb with all the available connectors.\n\n" +
           "You can build a custom version of jsPlumb by specifying a list of connectors and/or renderers on the command line, for example:\n\n" +
           "--> grunt build --connectors=flowchart,statemachine\n\n";

module.exports = function(grunt) {

    grunt.registerTask('help', 'Help with the jsPlumb build', function(arg1, arg2) {
        grunt.log.write(help);
    });

    grunt.registerTask('info', 'dumps info about what will be built', function(arg1, arg2) {
        grunt.log.write('Build jsPlumb');
    });


    var fileLists = function(suffix) {
        suffix = suffix || "";
        return {
            "dom":{
                src:getSources(grunt),
                dest:getOutputFilename(grunt, suffix)
            }
        };
    };

    // Project configuration.
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),
        concat: fileLists(),
        uglify: fileLists(".min"),
        qunit: {
            all: {
                options: {
                    urls:[
                        'http://localhost:3333/tests/unit/index.html'
                    ]
                }
            }
        },
        connect: {
            server: {
                options: {
                    port: 3333,
                    base: '.'
                }
            }
        },
        clean:{
            options:{
                force:true
            },
            dist:["dist"],
            jekyll:[
                "jekyll/doc",
                "jekyll/docs",
                "jekyll/_site"
            ],
            docs:["docs"]
        },
        jshint: {
            options: {
                  eqnull: true,
                  loopfunc:true,
                curly: true,
                eqeqeq: true,
                immed: true,
                latedef: true,
                newcap: true,
                noarg: true,
                sub: true,
                undef: true,
                  '-W018':true, // confusing use of '!'
				  '-W055':true,  // a constructor name should start with an uppercase letter.
                  '-W032':true,  // unnecessary semicolon.
                    '-W068':true, // Wrapping non-IIFE function literals in parens is unnecessary. (rollup does this. it isnt a problem)
                '-W030':true,   // rollup header issue
                '-W103':true, // the __proto__ property is deprecated
                globals:{
                    window:true,
                    Biltong:true,
                    exports:true,
                    console:true,
                    Image:true,
                    setTimeout:true,
                    document:true,
                    setInterval:true,
                    jsPlumb:true,
                    jsPlumbUtil:true,
                    getComputedStyle:true,
                    define:true
                }
            },
            files:{
                src: [ 'src/anchors.js', 'src/base-library-adapter.js', 'src/browser-util.js', 'src/connection.js', 'src/connectors-bezier.js', 'src/connectors-flowchart.js', 'src/connectors-statemachine.js', 'src/connectors-straight.js', 'src/defaults.js', 'src/dom.jsPlumb.js', 'src/dom-adapter.js', 'src/endpoint.js', 'src/group.js', 'src/jsPlumb.js', 'src/overlay-component.js', 'src/renderers-svg.js', 'src/util.js' ]
            }
        },
        watch: {
            scripts: {
                files: ['src/*.js'],
                tasks: ['build-src']
            }
        },
        jekyll: {
            options: {
                src:'jekyll'
            },
            dist:{
                options:{
                    dest:"jekyll/_site",
                    config:'jekyll/_config.yml'
                }
            }
        },
        exec:{
            "npmpack":{
                command:"npm pack;mv jsplumb-<%= pkg.version%>.tgz jsplumb.tgz"
            }
        },
        copy:{
            docs:{
                cwd: 'jekyll/_site/docs',  // set working folder / root to copy
                src: '**/*',           // copy all files and subfolders
                dest: 'docs',    // destination folder
                expand: true
            },
            docs_js:{
                cwd: 'jekyll/_site/js',  // set working folder / root to copy
                src: '**/*',           // copy all files and subfolders
                dest: 'docs/js',    // destination folder
                expand: true
            },
            docs_css:{
                cwd: 'jekyll/_site/css',  // set working folder / root to copy
                src: '**/*',           // copy all files and subfolders
                dest: 'docs/css',    // destination folder
                expand: true
            },
            docs_img:{
                cwd: 'jekyll/_site',  // set working folder / root to copy
                src: 'logo-medium-jsplumb.png',           // copy all files and subfolders
                dest: 'docs',    // destination folder
                expand: true
            }
        }
    });


    grunt.loadNpmTasks('grunt-contrib-concat');
    grunt.loadNpmTasks('grunt-contrib-uglify');
    grunt.loadNpmTasks('grunt-contrib-qunit');
    grunt.loadNpmTasks('grunt-contrib-connect');
    grunt.loadNpmTasks('grunt-qunit-junit');
    grunt.loadNpmTasks('grunt-contrib-clean');
    grunt.loadNpmTasks('grunt-contrib-jshint');
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.loadNpmTasks('grunt-contrib-copy');
    grunt.loadNpmTasks('grunt-exec');
    grunt.loadNpmTasks('grunt-jekyll');


    grunt.registerTask('insertVersion', function() {
        var src = grunt.file.read("dist/js/jsplumb.js");
        grunt.file.write("dist/js/jsplumb.js", src.replace("<% pkg.version %>", package.version));
        src = grunt.file.read("dist/js/jsplumb.min.js");
        grunt.file.write("dist/js/jsplumb.min.js", src.replace("<% pkg.version %>", package.version));
    });


    grunt.registerTask("build", [ 'build-src', 'exec:npmpack'/*, 'build-docs'*/ ]);
    grunt.registerTask('build-src', ['clean', 'jshint', 'concat', 'uglify', 'insertVersion' ]);
    grunt.registerTask('default', ['help']);
    grunt.registerTask('build-docs', ['clean:docs', 'docs', 'jekyll', 'finaliseDocs', 'copy:docs', 'copy:docs_js','copy:docs_css','copy:docs_img']);

    var _replace = function(cwd, pattern, oldV, newV, exclusions) {
        exclusions = exclusions || [];
        var _one = function(f) {
            if (exclusions.indexOf(f) == -1) {
                if (!grunt.file.isDir(cwd + "/" + f)) {
                    var c = grunt.file.read(cwd + "/" + f);
                    grunt.file.write(cwd + "/" + f, c.replace(oldV, newV));
                }
            }
        };
        var sources = grunt.file.expand({ cwd:cwd }, pattern);
        for (var i = 0; i < sources.length; i++)
            _one(sources[i]);
    };

    var _prepareDocs = function(inDir, outDir, category, layoutId) {
        console.log("PREPARE DOCS ", inDir, outDir, category, layoutId);

        // exclusions from input doc dir
        var exclusions = ["node_modules", "ff.htl", "dev-", "future-"];
        var communityPackage = require('./package.json');

        // 1. create directories for docs.
        grunt.file.mkdir(outDir);

        // 2. copy files from markdown directory into 'doc', and then give each one some front matter.
        var sources = grunt.file.expand({ cwd:inDir }, "*");
        for (var i = 0; i < sources.length; i++) {
            if (exclusions.indexOf(sources[i]) == -1 ) {
                if (sources[i].indexOf(".png") == -1) {
                    support.createMarkdownFile(grunt, inDir, sources[i], {
                        layout: sources[i] == "contents.md" ? "plain" : layoutId,
                        docId: sources[i].toUpperCase().replace(".MD", "").replace(/-_/g, " "),
                        category: category,
                        communityVersion:communityPackage.version
                    }, outDir);
                }
                else {
                    grunt.file.copy(inDir + "/" + sources[i], outDir + "/" + sources[i],  { noProcess:"*.*" });
                }
            }
        }

        /*
         ,
         permalink:"/docs/" + category + "/" + sources[i].split(".")[0] + ".html"
         */
    };

    var _replaceContents = function (dir) {
        var c = grunt.file.read(dir + "/contents.html");
        grunt.file.recurse(dir, function callback(abspath, rootdir, subdir, filename) {
            if (filename !== "contents.html") {
                var d = grunt.file.read(abspath);
                grunt.file.write(abspath, d.replace(/(<!-- contents.*>.*\n)(.*\n)*(.*\/contents -->)/, c));
            }
        });
    };

    var _insertHTMLSuffixIntoDocLinks = function(inDir) {

        // for all matches like these in every file inside /public/docs:

        // href="anchors"
        //href="anchors#something"

        // which is to say, an internal link, we need to insert ".html" either at the end of the string or
        // before the hash.
        //var inDir = "public/docs";
        var docs = grunt.file.expand({ cwd:inDir }, "*");
        for (var i = 0; i < docs.length; i++) {
            var f = grunt.file.read(inDir + "/" + docs[i]);

            grunt.file.write(inDir +"/" + docs[i], f.replace(/href=\"([^\"]+)\"/g, function() {
                // arguments[1] is the content of the link.
                var out;
                if (arguments[1] == "#" || arguments[1].indexOf("http") == 0 || arguments[1].indexOf("//") == 0 || arguments[1].indexOf(".") != -1 || arguments[1] === "/")
                    out = arguments[0];
                else {
                    var a = arguments[1].split("#");
                    //out =  "href=\"" + a[0] + ".html" + (a.length == 2 ? "#" + a[1] : "") + "\"";
                    out = "href=\"" + (a[0] != null && a[0].length > 0  && a[0] !== "/" ? a[0] + ".html" : "") + (a.length == 2 ? "#" + a[1] : "") + "\"";
                }

                return out;
            }));
        }
    };

    grunt.registerTask("docs", function() {
        _prepareDocs("doc/wiki", "jekyll/docs", "community", "doc");
    });

    grunt.registerTask("finaliseDocs", function() {
        _insertHTMLSuffixIntoDocLinks("jekyll/_site/docs");
        _replaceContents("jekyll/_site/docs");
        grunt.file.write("docs/index.html", "<!doctype html><html><head><meta http-equiv=\"refresh\" content=\"0; URL='home.html'\" /></head></html>");
    });


    grunt.registerTask('update', function() {
        var newV = grunt.option("newver");
        if (newV == null) {
            grunt.log.error("You must provide the new version: grunt update --newver=X.X.X");
        }
        else {
            var oldV = new RegExp(grunt.config("pkg").version, "g");
            // now update version number in all demos and src files etc
            _replace("src", "*.js", oldV, newV);
            _replace("demo", "**/*.html", oldV, newV);
            _replace(".", "package.json", oldV, newV);
            _replace(".", "README.md", oldV, newV);
        }

    });

    grunt.registerTask("test", ["connect:server", "qunit_junit", "qunit"]);

};