/*
This file is part of Ext JS 3.4

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-04-03 15:07:25
*/
/*
 * Internal drag zone implementation for the calendar components. This provides base functionality
 * and is primarily for the month view -- DayViewDD adds day/week view-specific functionality.
 */
Ext.calendar.DragZone = Ext.extend(Ext.dd.DragZone, {
    ddGroup: 'CalendarDD',
    eventSelector: '.ext-cal-evt',

    constructor: function(el, config) {
        if (!Ext.calendar._statusProxyInstance) {
            Ext.calendar._statusProxyInstance = new Ext.calendar.StatusProxy();
        }
        this.proxy = Ext.calendar._statusProxyInstance;
        Ext.calendar.DragZone.superclass.constructor.call(this, el, config);
    },

    getDragData: function(e) {
        // Check whether we are dragging on an event first
        var t = e.getTarget(this.eventSelector, 3);
        if (t) {
            var rec = this.view.getEventRecordFromEl(t);
            return {
                type: 'eventdrag',
                ddel: t,
                eventStart: rec.data[Ext.calendar.EventMappings.StartDate.name],
                eventEnd: rec.data[Ext.calendar.EventMappings.EndDate.name],
                proxy: this.proxy
            };
        }

        // If not dragging an event then we are dragging on
        // the calendar to add a new event
        t = this.view.getDayAt(e.getPageX(), e.getPageY());
        if (t.el) {
            return {
                type: 'caldrag',
                start: t.date,
                proxy: this.proxy
            };
        }
        return null;
    },

    onInitDrag: function(x, y) {
        if (this.dragData.ddel) {
            var ghost = this.dragData.ddel.cloneNode(true),
            child = Ext.fly(ghost).child('dl');

            Ext.fly(ghost).setWidth('auto');

            if (child) {
                // for IE/Opera
                child.setHeight('auto');
            }
            this.proxy.update(ghost);
            this.onStartDrag(x, y);
        }
        else if (this.dragData.start) {
            this.onStartDrag(x, y);
        }
        this.view.onInitDrag();
        return true;
    },

    afterRepair: function() {
        if (Ext.enableFx && this.dragData.ddel) {
            Ext.Element.fly(this.dragData.ddel).highlight(this.hlColor || 'c3daf9');
        }
        this.dragging = false;
    },

    getRepairXY: function(e) {
        if (this.dragData.ddel) {
            return Ext.Element.fly(this.dragData.ddel).getXY();
        }
    },

    afterInvalidDrop: function(e, id) {
        Ext.select('.ext-dd-shim').hide();
    },

    destroy: function() {
        // The point of this override is to preserve the singleton proxy object across
        // instances of CalendarDD. It must not be destroyed by the superclass code.
        this.proxy = {};
        Ext.calendar.DragZone.superclass.destroy.call(this);
        this.proxy = Ext.calendar._statusProxyInstance;
    }
});

/*
 * Internal drop zone implementation for the calendar components. This provides base functionality
 * and is primarily for the month view -- DayViewDD adds day/week view-specific functionality.
 */
Ext.calendar.DropZone = Ext.extend(Ext.dd.DropZone, {
    ddGroup: 'CalendarDD',
    eventSelector: '.ext-cal-evt',

    // private
    shims: [],

    getTargetFromEvent: function(e) {
        var dragOffset = this.dragOffset || 0,
        y = e.getPageY() - dragOffset,
        d = this.view.getDayAt(e.getPageX(), y);

        return d.el ? d: null;
    },

    onNodeOver: function(n, dd, e, data) {
        var D = Ext.calendar.Date,
        start = data.type == 'eventdrag' ? n.date: D.min(data.start, n.date),
        end = data.type == 'eventdrag' ? n.date.add(Date.DAY, D.diffDays(data.eventStart, data.eventEnd)) :
        D.max(data.start, n.date);

        if (!this.dragStartDate || !this.dragEndDate || (D.diffDays(start, this.dragStartDate) != 0) || (D.diffDays(end, this.dragEndDate) != 0)) {
            this.dragStartDate = start;
            this.dragEndDate = end.clearTime().add(Date.DAY, 1).add(Date.MILLI, -1);
            this.shim(start, end);

            var range = start.format('n/j');
            if (D.diffDays(start, end) > 0) {
                range += '-' + end.format('n/j');
            }
            var msg = String.format(data.type == 'eventdrag' ? this.moveText: this.createText, range);
            data.proxy.updateMsg(msg);
        }
        return this.dropAllowed;
    },

    shim: function(start, end) {
        this.currWeek = -1;
        var dt = start.clone(),
            i = 0,
            shim,
            box,
            cnt = Ext.calendar.Date.diffDays(dt, end) + 1;

        Ext.each(this.shims,
            function(shim) {
                if (shim) {
                    shim.isActive = false;
                }
            }
        );

        while (i++<cnt) {
            var dayEl = this.view.getDayEl(dt);

            // if the date is not in the current view ignore it (this
            // can happen when an event is dragged to the end of the
            // month so that it ends outside the view)
            if (dayEl) {
                var wk = this.view.getWeekIndex(dt);
                shim = this.shims[wk];

                if (!shim) {
                    shim = this.createShim();
                    this.shims[wk] = shim;
                }
                if (wk != this.currWeek) {
                    shim.boxInfo = dayEl.getBox();
                    this.currWeek = wk;
                }
                else {
                    box = dayEl.getBox();
                    shim.boxInfo.right = box.right;
                    shim.boxInfo.width = box.right - shim.boxInfo.x;
                }
                shim.isActive = true;
            }
            dt = dt.add(Date.DAY, 1);
        }

        Ext.each(this.shims,
        function(shim) {
            if (shim) {
                if (shim.isActive) {
                    shim.show();
                    shim.setBox(shim.boxInfo);
                }
                else if (shim.isVisible()) {
                    shim.hide();
                }
            }
        });
    },

    createShim: function() {
        if (!this.shimCt) {
            this.shimCt = Ext.get('ext-dd-shim-ct');
            if (!this.shimCt) {
                this.shimCt = document.createElement('div');
                this.shimCt.id = 'ext-dd-shim-ct';
                Ext.getBody().appendChild(this.shimCt);
            }
        }
        var el = document.createElement('div');
        el.className = 'ext-dd-shim';
        this.shimCt.appendChild(el);

        return new Ext.Layer({
            shadow: false,
            useDisplay: true,
            constrain: false
        },
        el);
    },

    clearShims: function() {
        Ext.each(this.shims,
        function(shim) {
            if (shim) {
                shim.hide();
            }
        });
    },

    onContainerOver: function(dd, e, data) {
        return this.dropAllowed;
    },

    onCalendarDragComplete: function() {
        delete this.dragStartDate;
        delete this.dragEndDate;
        this.clearShims();
    },

    onNodeDrop: function(n, dd, e, data) {
        if (n && data) {
            if (data.type == 'eventdrag') {
                var rec = this.view.getEventRecordFromEl(data.ddel),
                dt = Ext.calendar.Date.copyTime(rec.data[Ext.calendar.EventMappings.StartDate.name], n.date);

                this.view.onEventDrop(rec, dt);
                this.onCalendarDragComplete();
                return true;
            }
            if (data.type == 'caldrag') {
                this.view.onCalendarEndDrag(this.dragStartDate, this.dragEndDate,
                this.onCalendarDragComplete.createDelegate(this));
                //shims are NOT cleared here -- they stay visible until the handling
                //code calls the onCalendarDragComplete callback which hides them.
                return true;
            }
        }
        this.onCalendarDragComplete();
        return false;
    },

    onContainerDrop: function(dd, e, data) {
        this.onCalendarDragComplete();
        return false;
    },

    destroy: function() {
        Ext.calendar.DropZone.superclass.destroy.call(this);
        Ext.destroy(this.shimCt);
    }
});

