/* ***** BEGIN LICENSE BLOCK *****
 * Distributed under the BSD license:
 *
 * Copyright (c) 2010, Ajax.org B.V.
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
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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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * ***** END LICENSE BLOCK ***** */

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.$onChangeEditor = this.$onChangeEditor.bind(this);

        this.session.on("change", this.updateOnChange);
        this.session.on("changeFold", this.updateOnFold);
        this.session.on("changeEditor", this.$onChangeEditor);
    }

    (function () {
        this.getRowLength = function (row) {
            var h;
            if (this.lineWidgets)
                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 && !w.hidden)
                    screenRows += w.rowCount;
            });
            return screenRows;
        };

        this.$onChangeEditor = function (e) {
            this.attach(e.editor);
        };

        this.attach = function (editor) {
            if (editor && editor.widgetManager && editor.widgetManager != this)
                editor.widgetManager.detach();

            if (this.editor == editor)
                return;

            this.detach();
            this.editor = editor;

            if (editor) {
                editor.widgetManager = this;
                editor.renderer.on("beforeRender", this.measureWidgets);
                editor.renderer.on("afterRender", this.renderWidgets);
            }
        };
        this.detach = function (e) {
            var editor = this.editor;
            if (!editor)
                return;

            this.editor = null;
            editor.widgetManager = null;

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

        this.updateOnFold = function (e, session) {
            var lineWidgets = session.lineWidgets;
            if (!lineWidgets || !e.action)
                return;
            var fold = e.data;
            var start = fold.start.row;
            var end = fold.end.row;
            var hide = e.action == "add";
            for (var i = start + 1; i < end; i++) {
                if (lineWidgets[i])
                    lineWidgets[i].hidden = hide;
            }
            if (lineWidgets[end]) {
                if (hide) {
                    if (!lineWidgets[start])
                        lineWidgets[start] = lineWidgets[end];
                    else
                        lineWidgets[end].hidden = hide;
                } else {
                    if (lineWidgets[start] == lineWidgets[end])
                        lineWidgets[start] = undefined;
                    lineWidgets[end].hidden = hide;
                }
            }
        };

        this.updateOnChange = function (delta) {
            var lineWidgets = this.session.lineWidgets;
            if (!lineWidgets) return;

            var startRow = delta.start.row;
            var len = delta.end.row - startRow;

            if (len === 0) {
                // return
            } else if (delta.action == 'remove') {
                var removed = lineWidgets.splice(startRow + 1, len);
                removed.forEach(function (w) {
                    w && this.removeLineWidget(w);
                }, this);
                this.$updateRows();
            } else {
                var args = new Array(len);
                args.unshift(startRow, 0);
                lineWidgets.splice.apply(lineWidgets, args);
                this.$updateRows();
            }
        };

        this.$updateRows = function () {
            var lineWidgets = this.session.lineWidgets;
            if (!lineWidgets) return;
            var noWidgets = true;
            lineWidgets.forEach(function (w, i) {
                if (w) {
                    noWidgets = false;
                    w.row = i;
                    while (w.$oldWidget) {
                        w.$oldWidget.row = i;
                        w = w.$oldWidget;
                    }
                }
            });
            if (noWidgets)
                this.session.lineWidgets = null;
        };

        this.addLineWidget = function (w) {
            if (!this.session.lineWidgets)
                this.session.lineWidgets = new Array(this.session.getLength());

            var old = this.session.lineWidgets[w.row];
            if (old) {
                w.$oldWidget = old;
                if (old.el && old.el.parentNode) {
                    old.el.parentNode.removeChild(old.el);
                    old._inDocument = false;
                }
            }

            this.session.lineWidgets[w.row] = w;

            w.session = this.session;

            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");
                w.el.style.position = "absolute";
                w.el.style.zIndex = 5;
                renderer.container.appendChild(w.el);
                w._inDocument = true;
            }

            if (!w.coverGutter) {
                w.el.style.zIndex = 3;
            }
            if (w.pixelHeight == null) {
                w.pixelHeight = w.el.offsetHeight;
            }
            if (w.rowCount == null) {
                w.rowCount = w.pixelHeight / renderer.layerConfig.lineHeight;
            }

            var fold = this.session.getFoldAt(w.row, 0);
            w.$fold = fold;
            if (fold) {
                var lineWidgets = this.session.lineWidgets;
                if (w.row == fold.end.row && !lineWidgets[fold.start.row])
                    lineWidgets[fold.start.row] = w;
                else
                    w.hidden = true;
            }

            this.session._emit("changeFold", {data: {start: {row: w.row}}});

            this.$updateRows();
            this.renderWidgets(null, renderer);
            this.onWidgetChanged(w);
            return w;
        };

        this.removeLineWidget = function (w) {
            w._inDocument = false;
            w.session = null;
            if (w.el && w.el.parentNode)
                w.el.parentNode.removeChild(w.el);
            if (w.editor && w.editor.destroy) try {
                w.editor.destroy();
            } catch (e) {
            }
            if (this.session.lineWidgets) {
                var w1 = this.session.lineWidgets[w.row]
                if (w1 == w) {
                    this.session.lineWidgets[w.row] = w.$oldWidget;
                    if (w.$oldWidget)
                        this.onWidgetChanged(w.$oldWidget);
                } else {
                    while (w1) {
                        if (w1.$oldWidget == w) {
                            w1.$oldWidget = w.$oldWidget;
                            break;
                        }
                        w1 = w1.$oldWidget;
                    }
                }
            }
            this.session._emit("changeFold", {data: {start: {row: w.row}}});
            this.$updateRows();
        };

        this.getWidgetsAtRow = function (row) {
            var lineWidgets = this.session.lineWidgets;
            var w = lineWidgets && lineWidgets[row];
            var list = [];
            while (w) {
                list.push(w);
                w = w.$oldWidget;
            }
            return list;
        };

        this.onWidgetChanged = function (w) {
            this.session._changedWidgets.push(w);
            this.editor && this.editor.renderer.updateFull();
        };

        this.measureWidgets = function (e, renderer) {
            var changedWidgets = this.session._changedWidgets;
            var config = renderer.layerConfig;

            if (!changedWidgets || !changedWidgets.length) return;
            var min = Infinity;
            for (var i = 0; i < changedWidgets.length; i++) {
                var w = changedWidgets[i];
                if (!w || !w.el) continue;
                if (w.session != this.session) continue;
                if (!w._inDocument) {
                    if (this.session.lineWidgets[w.row] != w)
                        continue;
                    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 lineWidgets = this.session.lineWidgets;
            if (!lineWidgets)
                return;
            var first = Math.min(this.firstRow, config.firstRow);
            var last = Math.max(this.lastRow, config.lastRow, lineWidgets.length);

            while (first > 0 && !lineWidgets[first])
                first--;

            this.firstRow = config.firstRow;
            this.lastRow = config.lastRow;

            renderer.$cursorLayer.config = config;
            for (var i = first; i <= last; i++) {
                var w = lineWidgets[i];
                if (!w || !w.el) continue;
                if (w.hidden) {
                    w.el.style.top = -100 - (w.pixelHeight || 0) + "px";
                    continue;
                }
                if (!w._inDocument) {
                    w._inDocument = true;
                    renderer.container.appendChild(w.el);
                }
                var top = renderer.$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.fullWidth && w.screenWidth) {
                    w.el.style.minWidth = config.width + 2 * config.padding + "px";
                }

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

    }).call(LineWidgets.prototype);


    exports.LineWidgets = LineWidgets;

});


    

