/* vim:ts=4:sts=4:sw=4:
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Ajax.org Code Editor (ACE).
 *
 * The Initial Developer of the Original Code is
 *  Julian Viereck <julian.viereck@gmail.com>
 *
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

define(function(require, exports, module) {

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

var Editor = require("ace/editor").Editor;
var Renderer = require("ace/virtual_renderer").VirtualRenderer;
var EditSession = require("ace/edit_session").EditSession;

var Split = function(container, theme, splits) {
    this.BELOW = 1;
    this.BESIDE = 0;

    this.$container = container;
    this.$theme = theme;
    this.$splits = 0;
    this.$editorCSS = "";
    this.$editors = [];
    this.$oriantation = this.BESIDE;

    this.setSplits(splits || 1);
    this.$cEditor = this.$editors[0];


    this.on("focus", function(editor) {
        this.$cEditor = editor;
    }.bind(this));
};

(function(){

    oop.implement(this, EventEmitter);

    this.$createEditor = function() {
        var el = document.createElement("div");
        el.className = this.$editorCSS;
        el.style.cssText = "position: absolute; top:0px; bottom:0px";
        this.$container.appendChild(el);
        var session = new EditSession("");
        var editor = new Editor(new Renderer(el, this.$theme));

        editor.on("focus", function() {
            this._emit("focus", editor);
        }.bind(this));

        this.$editors.push(editor);
        editor.setFontSize(this.$fontSize);
        return editor;
    };

    this.setSplits = function(splits) {
        var editor;
        if (splits < 1) {
            throw "The number of splits have to be > 0!";
        }

        if (splits == this.$splits) {
            return;
        } else if (splits > this.$splits) {
            while (this.$splits < this.$editors.length && this.$splits < splits) {
                editor = this.$editors[this.$splits];
                this.$container.appendChild(editor.container);
                editor.setFontSize(this.$fontSize);
                this.$splits ++;
            }
            while (this.$splits < splits) {
                this.$createEditor();
                this.$splits ++;
            }
        } else {
            while (this.$splits > splits) {
                editor = this.$editors[this.$splits - 1];
                this.$container.removeChild(editor.container);
                this.$splits --;
            }
        }
        this.resize();
    };

    this.getSplits = function() {
        return this.$splits;
    };

    this.getEditor = function(idx) {
        return this.$editors[idx];
    };

    this.getCurrentEditor = function() {
        return this.$cEditor;
    };

    this.focus = function() {
        this.$cEditor.focus();
    };

    this.blur = function() {
        this.$cEditor.blur();
    };

    this.setTheme = function(theme) {
        this.$editors.forEach(function(editor) {
            editor.setTheme(theme);
        });
    };

    this.setKeyboardHandler = function(keybinding) {
        this.$editors.forEach(function(editor) {
            editor.setKeyboardHandler(keybinding);
        });
    };

    this.forEach = function(callback, scope) {
        this.$editors.forEach(callback, scope);
    };

    this.$fontSize = "";
    this.setFontSize = function(size) {
        this.$fontSize = size;
        this.forEach(function(editor) {
           editor.setFontSize(size);
        });
    };

    this.$cloneSession = function(session) {
        var s = new EditSession(session.getDocument(), session.getMode());

        var undoManager = session.getUndoManager();
        if (undoManager) {
            var undoManagerProxy = new UndoManagerProxy(undoManager, s);
            s.setUndoManager(undoManagerProxy);
        }

        // Overwrite the default $informUndoManager function such that new delas
        // aren't added to the undo manager from the new and the old session.
        s.$informUndoManager = lang.deferredCall(function() { s.$deltas = []; });

        // Copy over 'settings' from the session.
        s.setTabSize(session.getTabSize());
        s.setUseSoftTabs(session.getUseSoftTabs());
        s.setOverwrite(session.getOverwrite());
        s.setBreakpoints(session.getBreakpoints());
        s.setUseWrapMode(session.getUseWrapMode());
        s.setUseWorker(session.getUseWorker());
        s.setWrapLimitRange(session.$wrapLimitRange.min,
                            session.$wrapLimitRange.max);
        s.$foldData = session.$cloneFoldData();

        return s;
    };

    this.setSession = function(session, idx) {
        var editor
        if (idx == null) {
            editor = this.$cEditor;
        } else {
            editor = this.$editors[idx];
        }

        // Check if the session is used already by any of the editors in the
        // split. If it is, we have to clone the session as two editors using
        // the same session can cause terrible side effects (e.g. UndoQueue goes
        // wrong). This also gives the user of Split the possibility to treat
        // each session on each split editor different.
        var isUsed = this.$editors.some(function(editor) {
           return editor.session === session;
        });

        if (isUsed) {
            session = this.$cloneSession(session);
        }
        editor.setSession(session);

        // Return the session set on the editor. This might be a cloned one.
        return session;
    };

    this.getOriantation = function() {
        return this.$oriantation;
    };

    this.setOriantation = function(oriantation) {
        if (this.$oriantation == oriantation) {
            return;
        }
        this.$oriantation = oriantation;
        this.resize();
    };

    this.resize = function() {
        var width = this.$container.clientWidth;
        var height = this.$container.clientHeight;
        var editor;

        if (this.$oriantation == this.BESIDE) {
            var editorWidth = width / this.$splits;
            for (var i = 0; i < this.$splits; i++) {
                editor = this.$editors[i];
                editor.container.style.width = editorWidth + "px";
                editor.container.style.top = "0px";
                editor.container.style.left = i * editorWidth + "px";
                editor.container.style.height = height + "px";
                editor.resize();
            }
        } else {
            var editorHeight = height / this.$splits;
            for (var i = 0; i < this.$splits; i++) {
                editor = this.$editors[i];
                editor.container.style.width = width + "px";
                editor.container.style.top = i * editorHeight + "px";
                editor.container.style.left = "0px";
                editor.container.style.height = editorHeight + "px";
                editor.resize();
            }
        }
    };

}).call(Split.prototype);

function UndoManagerProxy(undoManager, session) {
    this.$u = undoManager;
    this.$doc = session;
}

(function() {
    this.execute = function(options) {
        this.$u.execute(options);
    };

    this.undo = function() {
        var selectionRange = this.$u.undo(true);
        if (selectionRange) {
            this.$doc.selection.setSelectionRange(selectionRange);
        }
    };

    this.redo = function() {
        var selectionRange = this.$u.redo(true);
        if (selectionRange) {
            this.$doc.selection.setSelectionRange(selectionRange);
        }
    };

    this.reset = function() {
        this.$u.reset();
    };

    this.hasUndo = function() {
        return this.$u.hasUndo();
    };

    this.hasRedo = function() {
        return this.$u.hasRedo();
    };
}).call(UndoManagerProxy.prototype);

exports.Split = Split;
});