/**
 * DevExtreme (ui/scroll_view/ui.scroll_view.simulated.js)
 * Version: 18.2.11
 * Build date: Mon Nov 11 2019
 *
 * Copyright (c) 2012 - 2019 Developer Express Inc. ALL RIGHTS RESERVED
 * Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
 */
"use strict";
var $ = require("../../core/renderer"),
    Callbacks = require("../../core/utils/callbacks"),
    each = require("../../core/utils/iterator").each,
    commonUtils = require("../../core/utils/common"),
    extend = require("../../core/utils/extend").extend,
    math = Math,
    simulatedStrategy = require("./ui.scrollable.simulated"),
    LoadIndicator = require("../load_indicator");
var SCROLLVIEW_PULLDOWN_REFRESHING_CLASS = "dx-scrollview-pull-down-loading",
    SCROLLVIEW_PULLDOWN_READY_CLASS = "dx-scrollview-pull-down-ready",
    SCROLLVIEW_PULLDOWN_IMAGE_CLASS = "dx-scrollview-pull-down-image",
    SCROLLVIEW_PULLDOWN_INDICATOR_CLASS = "dx-scrollview-pull-down-indicator",
    SCROLLVIEW_PULLDOWN_TEXT_CLASS = "dx-scrollview-pull-down-text",
    SCROLLVIEW_PULLDOWN_VISIBLE_TEXT_CLASS = "dx-scrollview-pull-down-text-visible",
    STATE_RELEASED = 0,
    STATE_READY = 1,
    STATE_REFRESHING = 2,
    STATE_LOADING = 3;
var ScrollViewScroller = simulatedStrategy.Scroller.inherit({
    ctor: function() {
        this._topPocketSize = 0;
        this.callBase.apply(this, arguments);
        this._initCallbacks();
        this._releaseState()
    },
    _releaseState: function() {
        this._state = STATE_RELEASED;
        this._refreshPullDownText()
    },
    _refreshPullDownText: function() {
        var that = this,
            pullDownTextItems = [{
                element: this._$pullingDownText,
                visibleState: STATE_RELEASED
            }, {
                element: this._$pulledDownText,
                visibleState: STATE_READY
            }, {
                element: this._$refreshingText,
                visibleState: STATE_REFRESHING
            }];
        each(pullDownTextItems, function(_, item) {
            var action = that._state === item.visibleState ? "addClass" : "removeClass";
            item.element[action](SCROLLVIEW_PULLDOWN_VISIBLE_TEXT_CLASS)
        })
    },
    _initCallbacks: function() {
        this.pullDownCallbacks = Callbacks();
        this.releaseCallbacks = Callbacks();
        this.reachBottomCallbacks = Callbacks()
    },
    _updateBounds: function() {
        var considerPockets = "horizontal" !== this._direction;
        this._topPocketSize = considerPockets ? this._$topPocket[this._dimension]() : 0;
        this._bottomPocketSize = considerPockets ? this._$bottomPocket[this._dimension]() : 0;
        this.callBase();
        this._bottomBound = this._minOffset + this._bottomPocketSize
    },
    _updateScrollbar: function() {
        this._scrollbar.option({
            containerSize: this._containerSize(),
            contentSize: this._contentSize() - this._topPocketSize - this._bottomPocketSize,
            scaleRatio: this._getScaleRatio()
        })
    },
    _moveContent: function() {
        this.callBase();
        if (this._isPullDown()) {
            this._pullDownReady()
        } else {
            if (this._isReachBottom()) {
                this._reachBottomReady()
            } else {
                if (this._state !== STATE_RELEASED) {
                    this._stateReleased()
                }
            }
        }
    },
    _moveScrollbar: function() {
        this._scrollbar.moveTo(this._topPocketSize + this._location)
    },
    _isPullDown: function() {
        return this._pullDownEnabled && this._location >= 0
    },
    _isReachBottom: function() {
        return this._reachBottomEnabled && this._location <= this._bottomBound
    },
    _scrollComplete: function() {
        if (this._inBounds() && this._state === STATE_READY) {
            this._pullDownRefreshing()
        } else {
            if (this._inBounds() && this._state === STATE_LOADING) {
                this._reachBottomLoading()
            } else {
                this.callBase()
            }
        }
    },
    _reachBottomReady: function() {
        if (this._state === STATE_LOADING) {
            return
        }
        this._state = STATE_LOADING;
        this._minOffset = this._getMinOffset()
    },
    _getMaxOffset: function() {
        return -this._topPocketSize
    },
    _getMinOffset: function() {
        return math.min(this.callBase(), -this._topPocketSize)
    },
    _reachBottomLoading: function() {
        this.reachBottomCallbacks.fire()
    },
    _pullDownReady: function() {
        if (this._state === STATE_READY) {
            return
        }
        this._state = STATE_READY;
        this._maxOffset = 0;
        this._$pullDown.addClass(SCROLLVIEW_PULLDOWN_READY_CLASS);
        this._refreshPullDownText()
    },
    _stateReleased: function() {
        if (this._state === STATE_RELEASED) {
            return
        }
        this._releaseState();
        this._updateBounds();
        this._$pullDown.removeClass(SCROLLVIEW_PULLDOWN_REFRESHING_CLASS).removeClass(SCROLLVIEW_PULLDOWN_READY_CLASS);
        this.releaseCallbacks.fire()
    },
    _pullDownRefreshing: function() {
        if (this._state === STATE_REFRESHING) {
            return
        }
        this._state = STATE_REFRESHING;
        this._$pullDown.addClass(SCROLLVIEW_PULLDOWN_REFRESHING_CLASS).removeClass(SCROLLVIEW_PULLDOWN_READY_CLASS);
        this._refreshPullDownText();
        this.pullDownCallbacks.fire()
    },
    _releaseHandler: function() {
        if (this._state === STATE_RELEASED) {
            this._moveToBounds()
        }
        this._update();
        if (this._releaseTask) {
            this._releaseTask.abort()
        }
        this._releaseTask = commonUtils.executeAsync(this._release.bind(this));
        return this._releaseTask.promise
    },
    _release: function() {
        this._stateReleased();
        this._scrollComplete()
    },
    _reachBottomEnablingHandler: function(enabled) {
        if (this._reachBottomEnabled === enabled) {
            return
        }
        this._reachBottomEnabled = enabled;
        this._updateBounds()
    },
    _pullDownEnablingHandler: function(enabled) {
        if (this._pullDownEnabled === enabled) {
            return
        }
        this._pullDownEnabled = enabled;
        this._considerTopPocketChange();
        this._updateHandler()
    },
    _considerTopPocketChange: function() {
        this._location -= this._$topPocket.height() || -this._topPocketSize;
        this._maxOffset = 0;
        this._move()
    },
    _pendingReleaseHandler: function() {
        this._state = STATE_READY
    },
    dispose: function() {
        if (this._releaseTask) {
            this._releaseTask.abort()
        }
        this.callBase()
    }
});
var SimulatedScrollViewStrategy = simulatedStrategy.SimulatedStrategy.inherit({
    _init: function(scrollView) {
        this.callBase(scrollView);
        this._$pullDown = scrollView._$pullDown;
        this._$topPocket = scrollView._$topPocket;
        this._$bottomPocket = scrollView._$bottomPocket;
        this._initCallbacks()
    },
    _initCallbacks: function() {
        this.pullDownCallbacks = Callbacks();
        this.releaseCallbacks = Callbacks();
        this.reachBottomCallbacks = Callbacks()
    },
    render: function() {
        this._renderPullDown();
        this.callBase()
    },
    _renderPullDown: function() {
        var $image = $("<div>").addClass(SCROLLVIEW_PULLDOWN_IMAGE_CLASS),
            $loadContainer = $("<div>").addClass(SCROLLVIEW_PULLDOWN_INDICATOR_CLASS),
            $loadIndicator = new LoadIndicator($("<div>")).$element(),
            $text = this._$pullDownText = $("<div>").addClass(SCROLLVIEW_PULLDOWN_TEXT_CLASS);
        this._$pullingDownText = $("<div>").text(this.option("pullingDownText")).appendTo($text);
        this._$pulledDownText = $("<div>").text(this.option("pulledDownText")).appendTo($text);
        this._$refreshingText = $("<div>").text(this.option("refreshingText")).appendTo($text);
        this._$pullDown.empty().append($image).append($loadContainer.append($loadIndicator)).append($text)
    },
    pullDownEnable: function(enabled) {
        this._eventHandler("pullDownEnabling", enabled)
    },
    reachBottomEnable: function(enabled) {
        this._eventHandler("reachBottomEnabling", enabled)
    },
    _createScroller: function(direction) {
        var that = this;
        var scroller = that._scrollers[direction] = new ScrollViewScroller(that._scrollerOptions(direction));
        scroller.pullDownCallbacks.add(function() {
            that.pullDownCallbacks.fire()
        });
        scroller.releaseCallbacks.add(function() {
            that.releaseCallbacks.fire()
        });
        scroller.reachBottomCallbacks.add(function() {
            that.reachBottomCallbacks.fire()
        })
    },
    _scrollerOptions: function(direction) {
        return extend(this.callBase(direction), {
            $topPocket: this._$topPocket,
            $bottomPocket: this._$bottomPocket,
            $pullDown: this._$pullDown,
            $pullDownText: this._$pullDownText,
            $pullingDownText: this._$pullingDownText,
            $pulledDownText: this._$pulledDownText,
            $refreshingText: this._$refreshingText
        })
    },
    pendingRelease: function() {
        this._eventHandler("pendingRelease")
    },
    release: function() {
        return this._eventHandler("release").done(this._updateAction)
    },
    location: function location() {
        var location = this.callBase();
        location.top += this._$topPocket.height();
        return location
    },
    dispose: function() {
        each(this._scrollers, function() {
            this.dispose()
        });
        this.callBase()
    }
});
module.exports = SimulatedScrollViewStrategy;
