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define(function(require, exports, module) {
"use strict";

var oop = require("./lib/oop");
var dom = require("./lib/dom");
var Range = require("./range").Range;


function LineWidgets(session) {
    this.session = session;
    this.session.widgetManager = this;
    this.session.getRowLength = this.getRowLength;
    this.session.$getWidgetScreenLength = this.$getWidgetScreenLength;
    this.updateOnChange = this.updateOnChange.bind(this);
    this.renderWidgets = this.renderWidgets.bind(this);
    this.measureWidgets = this.measureWidgets.bind(this);
    this.session._changedWidgets = [];
    this.detach = this.detach.bind(this);
    
    this.session.on("change", this.updateOnChange);
};

(function() {
    this.getRowLength = function(row) {
        if (this.lineWidgets)
            var h = this.lineWidgets[row] && this.lineWidgets[row].rowCount || 0;
        else 
            h = 0;
        if (!this.$useWrapMode || !this.$wrapData[row]) {
            return 1 + h;
        } else {
            return this.$wrapData[row].length + 1 + h;
        }
    };

    this.$getWidgetScreenLength = function() {
        var screenRows = 0;
        this.lineWidgets.forEach(function(w){
            if (w && w.rowCount)
                screenRows +=w.rowCount;
        });
        return screenRows;
    };    
    
    this.attach = function(editor) {
        if (editor.widgetManager && editor.widgetManager != this)
            editor.widgetManager.detach();

        if (this.editor == editor)
            return;

        this.detach();
        this.editor = editor;
        
        this.editor.on("changeSession", this.detach);
        
        editor.widgetManager = this;

        editor.setOption("enableLineWidgets", true);
        editor.renderer.on("beforeRender", this.measureWidgets);
        editor.renderer.on("afterRender", this.renderWidgets);
    };
    this.detach = function(e) {
        if (e && e.session == this.session)
            return; // sometimes attach can be called before setSession
        var editor = this.editor;
        if (!editor)
            return;

        editor.off("changeSession", this.detach);
        
        this.editor = null;
        editor.widgetManager = null;
        
        editor.renderer.off("beforeRender", this.measureWidgets);
        editor.renderer.off("afterRender", this.renderWidgets);
        this.session.lineWidgets.forEach(function(w) {
            if (w && w.el && w.el.parentNode) {
                w._inDocument = false;
                w.el.parentNode.removeChild(w.el);
            }
        });
    };

    this.updateOnChange = function(e) {
        var cells = this.session.lineWidgets;
        if (!cells) return;
            
        var delta = e.data;
        var range = delta.range;
        var startRow = range.start.row;
        var len = range.end.row - startRow;

        if (len === 0) {
            // return
        } else if (delta.action == "removeText" || delta.action == "removeLines") {
            var removed = cells.splice(startRow + 1, len);
            removed.forEach(function(w) {
                w && this.removeLineWidget(w);
            }, this);
            this.$updateRows();
        } else {
            var args = Array(len);
            args.unshift(startRow, 0);
            cells.splice.apply(cells, args);
            this.$updateRows();
        }
    };
    
    this.$updateRows = function() {
        var lw = this.session.lineWidgets;
        if (!lw) return;
        var noWidgets = true;
        lw.forEach(function(w, i) {
            if (w) {
                noWidgets = false;
                w.row = i;
            }
        });
        if (noWidgets)
            this.session.lineWidgets = null;
    }

    this.addLineWidget = function(w) {
        if (!this.session.lineWidgets)
            this.session.lineWidgets = Array(this.session.getLength())
        
        this.session.lineWidgets[w.row] = w;
        
        var renderer = this.editor.renderer;
        if (w.html && !w.el) {
            w.el = dom.createElement("div");
            w.el.innerHTML = w.html;
        }
        if (w.el) {
            dom.addCssClass(w.el, "ace_lineWidgetContainer");
            renderer.container.appendChild(w.el);
            w._inDocument = true;
        }
        
        if (!w.coverGutter) {
            w.el.style.zIndex = 3;
        }
        if (!w.pixelHeight) {
            w.pixelHeight = w.el.offsetHeight;
        }
        if (w.rowCount == null)
            w.rowCount = w.pixelHeight / renderer.layerConfig.lineHeight;
        
        this.session._emit("changeFold", {data:{start:{row: w.row}}});
        
        this.$updateRows();
        this.renderWidgets(null, renderer);
        return w;
    };
    
    this.removeLineWidget = function(w) {
        w._inDocument = false;
        if (w.el && w.el.parentNode)
            w.el.parentNode.removeChild(w.el);
        if (w.editor && w.editor.destroy) try {
            w.editor.destroy();
        } catch(e){}
        this.session.lineWidgets[w.row] = undefined;
        this.session._emit("changeFold", {data:{start:{row: w.row}}});
        this.$updateRows();
    };
    
    this.onWidgetChanged = function(w) {
        this.session._changedWidgets.push(w);
        this.editor && this.editor.renderer.updateFull();
    };
    
    this.measureWidgets = function(e, renderer) {
        var ws = this.session._changedWidgets;
        var config = renderer.layerConfig;
        
        if (!ws || !ws.length) return;
        var min = Infinity;
        for (var i = 0; i < ws.length; i++) {
            var w = ws[i].lineWidget;
            if (!w._inDocument) {
                w._inDocument = true;
                renderer.container.appendChild(w.el);
            }
            
            w.h = w.el.offsetHeight;
            
            if (!w.fixedWidth) {
                w.w = w.el.offsetWidth;
                w.screenWidth = Math.ceil(w.w / config.characterWidth);
            }
            
            var rowCount = w.h / config.lineHeight;
            if (w.coverLine) {
                rowCount -= this.session.getRowLineCount(w.row);
                if (rowCount < 0)
                    rowCount = 0;
            }
            if (w.rowCount != rowCount) {
                w.rowCount = rowCount;
                if (w.row < min)
                    min = w.row;
            }
        }
        if (min != Infinity) {
            this.session._emit("changeFold", {data:{start:{row: min}}});
            this.session.lineWidgetWidth = null;
        }
        this.session._changedWidgets = [];
    };
    
    this.renderWidgets = function(e, renderer) {
        var config = renderer.layerConfig;
        var ws = this.session.lineWidgets;
        if (!ws)
            return;
        var first = Math.min(this.firstRow, config.firstRow);
        var last = Math.max(this.lastRow, config.lastRow, ws.length);
        
        while (first > 0 && !ws[first])
            first--;
        
        this.firstRow = config.firstRow;
        this.lastRow = config.lastRow;

        renderer.$cursorLayer.config = config;
        for (var i = first; i <= last; i++) {
            var w = ws[i];
            if (!w || !w.el) continue;

            if (!w._inDocument) {
                w._inDocument = true;
                renderer.container.appendChild(w.el);
            }
            var top = renderer.$cursorLayer.getPixelPosition({row: i, column:0}, true).top;
            if (!w.coverLine)
                top += config.lineHeight * this.session.getRowLineCount(w.row);
            w.el.style.top = top - config.offset + "px";
            
            var left = w.coverGutter ? 0 : renderer.gutterWidth;
            if (!w.fixedWidth)
                left -= renderer.scrollLeft;
            w.el.style.left = left + "px";

            if (w.fixedWidth) {
                w.el.style.right = renderer.scrollBar.getWidth() + "px";
            } else {
                w.el.style.right = "";
            }
        }
    };
    
}).call(LineWidgets.prototype);


exports.LineWidgets = LineWidgets;

});