// # Surrounds given text with Markdown syntax

/*global $, window, CodeMirror, Showdown, moment */
(function () {
    "use strict";
    var Markdown = {
        init : function (options, elem) {
            var self = this;
            self.elem = elem;

            self.style = (typeof options === 'string') ? options : options.style;

            self.options = $.extend({}, CodeMirror.prototype.addMarkdown.options, options);

            self.replace();
        },
        replace: function () {
            var text = this.elem.getSelection(), pass = true, md, cursor, line, word, letterCount, converter;
            switch (this.style) {
            case "h1":
                cursor = this.elem.getCursor();
                line = this.elem.getLine(cursor.line);
                this.elem.setLine(cursor.line, "# " + line);
                this.elem.setCursor(cursor.line, cursor.ch + 2);
                pass = false;
                break;
            case "h2":
                cursor = this.elem.getCursor();
                line = this.elem.getLine(cursor.line);
                this.elem.setLine(cursor.line, "## " + line);
                this.elem.setCursor(cursor.line, cursor.ch + 3);
                pass = false;
                break;
            case "h3":
                cursor = this.elem.getCursor();
                line = this.elem.getLine(cursor.line);
                this.elem.setLine(cursor.line, "### " + line);
                this.elem.setCursor(cursor.line, cursor.ch + 4);
                pass = false;
                break;
            case "h4":
                cursor = this.elem.getCursor();
                line = this.elem.getLine(cursor.line);
                this.elem.setLine(cursor.line, "#### " + line);
                this.elem.setCursor(cursor.line, cursor.ch + 5);
                pass = false;
                break;
            case "h5":
                cursor = this.elem.getCursor();
                line = this.elem.getLine(cursor.line);
                this.elem.setLine(cursor.line, "##### " + line);
                this.elem.setCursor(cursor.line, cursor.ch + 6);
                pass = false;
                break;
            case "h6":
                cursor = this.elem.getCursor();
                line = this.elem.getLine(cursor.line);
                this.elem.setLine(cursor.line, "###### " + line);
                this.elem.setCursor(cursor.line, cursor.ch + 7);
                pass = false;
                break;
            case "link":
                md = this.options.syntax.link.replace('$1', text);
                this.elem.replaceSelection(md, "end");
                cursor = this.elem.getCursor();
                this.elem.setSelection({line: cursor.line, ch: cursor.ch - 8}, {line: cursor.line, ch: cursor.ch - 1});
                pass = false;
                break;
            case "image":
                md = this.options.syntax.image.replace('$1', text);
                this.elem.replaceSelection(md, "end");
                cursor = this.elem.getCursor();
                this.elem.setSelection({line: cursor.line, ch: cursor.ch - 8}, {line: cursor.line, ch: cursor.ch - 1});
                pass = false;
                break;
            case "uppercase":
                md = text.toLocaleUpperCase();
                break;
            case "lowercase":
                md = text.toLocaleLowerCase();
                break;
            case "titlecase":
                md = text.toTitleCase();
                break;
            case "selectword":
                cursor = this.elem.getCursor();
                word = this.elem.getTokenAt(cursor);
                if (!/\w$/g.test(word.string)) {
                    this.elem.setSelection({line: cursor.line, ch: word.start}, {line: cursor.line, ch: word.end - 1});
                } else {
                    this.elem.setSelection({line: cursor.line, ch: word.start}, {line: cursor.line, ch: word.end});
                }
                break;
            case "copyHTML":
                converter = new Showdown.converter();
                if (text) {
                    md = converter.makeHtml(text);
                } else {
                    md = converter.makeHtml(this.elem.getValue());
                }

                $(".modal-copyToHTML-content").text(md).selectText();
                $(".js-modal").center();
                pass = false;
                break;
            case "list":
                md = text.replace(/^(\s*)(\w\W*)/gm, "$1* $2");
                this.elem.replaceSelection(md, "end");
                pass = false;
                break;
            case "currentDate":
                md = moment(new Date()).format("D MMMM YYYY");
                break;
            default:
                if (this.options.syntax[this.style]) {
                    md = this.options.syntax[this.style].replace('$1', text);
                }
            }
            if (pass && md) {
                this.elem.replaceSelection(md, "end");
                if (!text) {
                    letterCount = md.length;
                    cursor = this.elem.getCursor();
                    this.elem.setCursor({line: cursor.line, ch: cursor.ch - (letterCount / 2)});
                }
            }
        }
    };

    CodeMirror.prototype.addMarkdown = function (options) {
        var markdown = Object.create(Markdown);
        markdown.init(options, this);
    };

    CodeMirror.prototype.addMarkdown.options = {
        style: null,
        syntax: {
            bold: "**$1**",
            italic: "_$1_",
            strike: "~~$1~~",
            code: "`$1`",
            link: "[$1](http://)",
            image: "![$1](http://)",
            blockquote: "> $1"
        }
    };

}());