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 *       notice, this list of conditions and the following disclaimer.
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
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define(function(require, exports, module) {
"use strict";

var dom = require("../lib/dom");
var oop = require("../lib/oop");
var lang = require("../lib/lang");
var EventEmitter = require("../lib/event_emitter").EventEmitter;

var Gutter = function(parentEl) {
    this.element = dom.createElement("div");
    this.element.className = "ace_layer ace_gutter-layer";
    parentEl.appendChild(this.element);
    this.setShowFoldWidgets(this.$showFoldWidgets);
    
    this.gutterWidth = 0;

    this.$annotations = [];
    this.$updateAnnotations = this.$updateAnnotations.bind(this);
};

(function() {

    oop.implement(this, EventEmitter);

    this.setSession = function(session) {
        if (this.session)
            this.session.removeEventListener("change", this.$updateAnnotations);
        this.session = session;
        session.on("change", this.$updateAnnotations);
    };

    this.addGutterDecoration = function(row, className){
        if (window.console)
            console.warn && console.warn("deprecated use session.addGutterDecoration");
        this.session.addGutterDecoration(row, className);
    };

    this.removeGutterDecoration = function(row, className){
        if (window.console)
            console.warn && console.warn("deprecated use session.removeGutterDecoration");
        this.session.removeGutterDecoration(row, className);
    };

    this.setAnnotations = function(annotations) {
        // iterate over sparse array
        this.$annotations = []
        var rowInfo, row;
        for (var i = 0; i < annotations.length; i++) {
            var annotation = annotations[i];
            var row = annotation.row;
            var rowInfo = this.$annotations[row];
            if (!rowInfo)
                rowInfo = this.$annotations[row] = {text: []};
           
            var annoText = annotation.text;
            annoText = annoText ? lang.escapeHTML(annoText) : annotation.html || "";

            if (rowInfo.text.indexOf(annoText) === -1)
                rowInfo.text.push(annoText);

            var type = annotation.type;
            if (type == "error")
                rowInfo.className = " ace_error";
            else if (type == "warning" && rowInfo.className != " ace_error")
                rowInfo.className = " ace_warning";
            else if (type == "info" && (!rowInfo.className))
                rowInfo.className = " ace_info";
        }
    };

    this.$updateAnnotations = function (e) {
        if (!this.$annotations.length)
            return;
        var delta = e.data;
        var range = delta.range;
        var firstRow = range.start.row;
        var len = range.end.row - firstRow;
        if (len === 0) {
            // do nothing
        } else if (delta.action == "removeText" || delta.action == "removeLines") {
            this.$annotations.splice(firstRow, len + 1, null);
        } else {
            var args = Array(len + 1);
            args.unshift(firstRow, 1);
            this.$annotations.splice.apply(this.$annotations, args);
        }
    };

    this.update = function(config) {
        var emptyAnno = {className: ""};
        var html = [];
        var i = config.firstRow;
        var lastRow = config.lastRow;
        var fold = this.session.getNextFoldLine(i);
        var foldStart = fold ? fold.start.row : Infinity;
        var foldWidgets = this.$showFoldWidgets && this.session.foldWidgets;
        var breakpoints = this.session.$breakpoints;
        var decorations = this.session.$decorations;
        var lastLineNumber = 0;

        while (true) {
            if(i > foldStart) {
                i = fold.end.row + 1;
                fold = this.session.getNextFoldLine(i, fold);
                foldStart = fold ?fold.start.row :Infinity;
            }
            if(i > lastRow)
                break;

            var annotation = this.$annotations[i] || emptyAnno;
            html.push(
                "<div class='ace_gutter-cell ",
                breakpoints[i] || "", decorations[i] || "", annotation.className,
                "' style='height:", this.session.getRowLength(i) * config.lineHeight, "px;'>", 
                lastLineNumber = i + 1
            );

            if (foldWidgets) {
                var c = foldWidgets[i];
                // check if cached value is invalidated and we need to recompute
                if (c == null)
                    c = foldWidgets[i] = this.session.getFoldWidget(i);
                if (c)
                    html.push(
                        "<span class='ace_fold-widget ace_", c,
                        c == "start" && i == foldStart && i < fold.end.row ? " ace_closed" : " ace_open",
                        "' style='height:", config.lineHeight, "px",
                        "'></span>"
                    );
            }

            html.push("</div>");

            i++;
        }

        this.element = dom.setInnerHtml(this.element, html.join(""));
        this.element.style.height = config.minHeight + "px";
        
        if (this.session.$useWrapMode)
            lastLineNumber = this.session.getLength();
        
        var gutterWidth = ("" + lastLineNumber).length * config.characterWidth;
        var padding = this.$padding || this.$computePadding();
        gutterWidth += padding.left + padding.right;
        if (gutterWidth !== this.gutterWidth) {
            this.gutterWidth = gutterWidth;
            this.element.style.width = Math.ceil(this.gutterWidth) + "px";
            this._emit("changeGutterWidth", gutterWidth);
        }
    };

    this.$showFoldWidgets = true;
    this.setShowFoldWidgets = function(show) {
        if (show)
            dom.addCssClass(this.element, "ace_folding-enabled");
        else
            dom.removeCssClass(this.element, "ace_folding-enabled");

        this.$showFoldWidgets = show;
        this.$padding = null;
    };
    
    this.getShowFoldWidgets = function() {
        return this.$showFoldWidgets;
    };

    this.$computePadding = function() {
        if (!this.element.firstChild)
            return {left: 0, right: 0};
        var style = dom.computedStyle(this.element.firstChild);
        this.$padding = {}
        this.$padding.left = parseInt(style.paddingLeft) + 1;
        this.$padding.right = parseInt(style.paddingRight);  
        return this.$padding;
    };

    this.getRegion = function(point) {
        var padding = this.$padding || this.$computePadding();
        var rect = this.element.getBoundingClientRect();
        if (point.x < padding.left + rect.left)
            return "markers";
        if (this.$showFoldWidgets && point.x > rect.right - padding.right)
            return "foldWidgets";
    };

}).call(Gutter.prototype);

exports.Gutter = Gutter;

});