/*!
 * Ext JS Library 3.4.0
 * Copyright(c) 2006-2011 Sencha Inc.
 * licensing@sencha.com
 * http://www.sencha.com/license
 */
/*
 * 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();
    }
});

/*
 * 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);
    }
});

