/**
 * DevExtreme (ui/grid_core/ui.grid_core.data_source_adapter.js)
 * Version: 17.2.10 (build 18271)
 * Build date: Fri Sep 28 2018
 *
 * Copyright (c) 2012 - 2018 Developer Express Inc. ALL RIGHTS RESERVED
 * Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
 */
"use strict";
var Callbacks = require("../../core/utils/callbacks"),
    gridCore = require("../data_grid/ui.data_grid.core"),
    commonUtils = require("../../core/utils/common"),
    typeUtils = require("../../core/utils/type"),
    each = require("../../core/utils/iterator").each,
    extend = require("../../core/utils/extend").extend,
    ArrayStore = require("../../data/array_store"),
    deferredUtils = require("../../core/utils/deferred"),
    when = deferredUtils.when,
    Deferred = deferredUtils.Deferred;
module.exports = gridCore.Controller.inherit(function() {
    function cloneItems(items, groupCount) {
        if (items) {
            items = items.slice(0);
            if (groupCount) {
                for (var i = 0; i < items.length; i++) {
                    items[i] = extend({
                        key: items[i].key
                    }, items[i]);
                    items[i].items = cloneItems(items[i].items, groupCount - 1)
                }
            }
        }
        return items
    }

    function calculateOperationTypes(loadOptions, lastLoadOptions) {
        var operationTypes = {};
        if (lastLoadOptions) {
            operationTypes = {
                sorting: !gridCore.equalSortParameters(loadOptions.sort, lastLoadOptions.sort),
                grouping: !gridCore.equalSortParameters(loadOptions.group, lastLoadOptions.group, true),
                filtering: !gridCore.equalFilterParameters(loadOptions.filter, lastLoadOptions.filter),
                skip: loadOptions.skip !== lastLoadOptions.skip,
                take: loadOptions.take !== lastLoadOptions.take
            };
            operationTypes.reload = operationTypes.sorting || operationTypes.grouping || operationTypes.filtering;
            operationTypes.paging = operationTypes.skip || operationTypes.take
        }
        return operationTypes
    }

    function executeTask(action, timeout) {
        if (typeUtils.isDefined(timeout)) {
            commonUtils.executeAsync(action, timeout)
        } else {
            action()
        }
    }
    return {
        init: function(dataSource, remoteOperations) {
            var that = this;
            that._dataSource = dataSource;
            that._remoteOperations = remoteOperations || {};
            that._isLastPage = !dataSource.isLastPage();
            that._hasLastPage = false;
            that._currentTotalCount = 0;
            that.changed = Callbacks();
            that.loadingChanged = Callbacks();
            that.loadError = Callbacks();
            that.customizeStoreLoadOptions = Callbacks();
            that._dataChangedHandler = that._handleDataChanged.bind(that);
            that._dataLoadingHandler = that._handleDataLoading.bind(that);
            that._dataLoadedHandler = that._handleDataLoaded.bind(that);
            that._loadingChangedHandler = that._handleLoadingChanged.bind(that);
            that._loadErrorHandler = that._handleLoadError.bind(that);
            dataSource.on("changed", that._dataChangedHandler);
            dataSource.on("customizeStoreLoadOptions", that._dataLoadingHandler);
            dataSource.on("customizeLoadResult", that._dataLoadedHandler);
            dataSource.on("loadingChanged", that._loadingChangedHandler);
            dataSource.on("loadError", that._loadErrorHandler);
            each(dataSource, function(memberName, member) {
                if (!that[memberName] && typeUtils.isFunction(member)) {
                    that[memberName] = function() {
                        return this._dataSource[memberName].apply(this._dataSource, arguments)
                    }
                }
            })
        },
        remoteOperations: function() {
            return this._remoteOperations
        },
        dispose: function(isSharedDataSource) {
            var that = this,
                dataSource = that._dataSource;
            dataSource.off("changed", that._dataChangedHandler);
            dataSource.off("customizeStoreLoadOptions", that._dataLoadingHandler);
            dataSource.off("customizeLoadResult", that._dataLoadedHandler);
            dataSource.off("loadingChanged", that._loadingChangedHandler);
            dataSource.off("loadError", that._loadErrorHandler);
            if (!isSharedDataSource) {
                dataSource.dispose()
            }
        },
        refresh: function(options, isReload, operationTypes) {
            var that = this,
                dataSource = that._dataSource;
            if (isReload || operationTypes.reload) {
                that._currentTotalCount = 0;
                that._isLastPage = !dataSource.paginate();
                that._hasLastPage = that._isLastPage
            }
        },
        resetCache: function() {
            this._cachedStoreData = void 0;
            this._cachedPagingData = void 0
        },
        _customizeRemoteOperations: function(options, isReload, operationTypes) {
            var that = this,
                cachedStoreData = that._cachedStoreData,
                cachedPagingData = that._cachedPagingData;
            if (isReload) {
                cachedStoreData = void 0;
                cachedPagingData = void 0
            } else {
                if (operationTypes.reload) {
                    cachedPagingData = void 0
                }
                each(operationTypes, function(operationType, value) {
                    if (value && options.remoteOperations[operationType]) {
                        cachedStoreData = void 0;
                        cachedPagingData = void 0
                    }
                })
            }
            if (cachedPagingData) {
                options.remoteOperations.paging = false
            }
            options.cachedStoreData = cachedStoreData;
            options.cachedPagingData = cachedPagingData;
            if (!options.isCustomLoading) {
                that._cachedStoreData = cachedStoreData;
                that._cachedPagingData = cachedPagingData
            }
        },
        _handleDataLoading: function(options) {
            var loadOptions, operationTypes, that = this,
                dataSource = that._dataSource,
                lastLoadOptions = that._lastLoadOptions;
            that.customizeStoreLoadOptions.fire(options);
            options.delay = this.option("loadingTimeout");
            options.originalStoreLoadOptions = options.storeLoadOptions;
            options.remoteOperations = extend({}, this.remoteOperations());
            var isReload = !that.isLoaded() && !that._isRefreshing;
            loadOptions = extend({}, options.storeLoadOptions);
            operationTypes = calculateOperationTypes(loadOptions, lastLoadOptions);
            that._customizeRemoteOperations(options, isReload, operationTypes);
            if (!options.isCustomLoading) {
                var isRefreshing = that._isRefreshing;
                options.lastLoadOptions = loadOptions;
                that._isRefreshing = true;
                when(isRefreshing || that.refresh(options, isReload, operationTypes)).done(function() {
                    if (that._lastOperationId === options.operationId) {
                        that.load()
                    }
                }).fail(function() {
                    dataSource.cancel(options.operationId)
                }).always(function() {
                    that._isRefreshing = false
                });
                dataSource.cancel(that._lastOperationId);
                that._lastOperationId = options.operationId;
                if (that._isRefreshing) {
                    dataSource.cancel(that._lastOperationId)
                }
            }
            this._handleDataLoadingCore(options)
        },
        _handleDataLoadingCore: function(options) {
            var remoteOperations = options.remoteOperations;
            options.loadOptions = {};
            var localLoadOptionNames = {
                filter: !remoteOperations.filtering,
                sort: !remoteOperations.sorting,
                group: !remoteOperations.grouping,
                summary: !remoteOperations.summary,
                skip: !remoteOperations.paging,
                take: !remoteOperations.paging,
                requireTotalCount: !remoteOperations.paging
            };
            each(options.storeLoadOptions, function(optionName, optionValue) {
                if (localLoadOptionNames[optionName]) {
                    options.loadOptions[optionName] = optionValue;
                    delete options.storeLoadOptions[optionName]
                }
            });
            options.data = options.cachedStoreData
        },
        _handleDataLoaded: function(options) {
            var loadOptions = options.loadOptions,
                localPaging = options.remoteOperations && !options.remoteOperations.paging,
                isCaching = false !== this.option("cacheEnabled") && localPaging && options.storeLoadOptions,
                needStoreCache = isCaching && !options.isCustomLoading;
            if (!loadOptions) {
                this._dataSource.cancel(options.operationId);
                return
            }
            if (options.lastLoadOptions) {
                this._lastLoadOptions = options.lastLoadOptions
            }
            if (localPaging) {
                options.skip = loadOptions.skip;
                options.take = loadOptions.take;
                delete loadOptions.skip;
                delete loadOptions.take
            }
            if (loadOptions.group) {
                loadOptions.group = options.group || loadOptions.group
            }
            var groupCount = gridCore.normalizeSortingInfo(options.storeLoadOptions.group || loadOptions.group).length;
            if (isCaching && options.cachedPagingData) {
                options.data = cloneItems(options.cachedPagingData, groupCount)
            } else {
                if (needStoreCache) {
                    if (!this._cachedStoreData) {
                        this._cachedStoreData = cloneItems(options.data, gridCore.normalizeSortingInfo(options.storeLoadOptions.group).length)
                    } else {
                        if (options.mergeStoreLoadData) {
                            options.data = this._cachedStoreData = this._cachedStoreData.concat(options.data)
                        }
                    }
                }
                new ArrayStore(options.data).load(loadOptions).done(function(data) {
                    options.data = data
                });
                if (needStoreCache) {
                    this._cachedPagingData = cloneItems(options.data, groupCount)
                }
            }
            if (loadOptions.requireTotalCount && localPaging) {
                options.extra = typeUtils.isPlainObject(options.extra) ? options.extra : {};
                options.extra.totalCount = options.data.length
            }
            this._handleDataLoadedCore(options);
            options.storeLoadOptions = options.originalStoreLoadOptions
        },
        _handleDataLoadedCore: function(options) {
            if (options.remoteOperations && !options.remoteOperations.paging && Array.isArray(options.data)) {
                if (void 0 !== options.skip) {
                    options.data = options.data.slice(options.skip)
                }
                if (void 0 !== options.take) {
                    options.data = options.data.slice(0, options.take)
                }
            }
        },
        _handleLoadingChanged: function(isLoading) {
            this.loadingChanged.fire(isLoading)
        },
        _handleLoadError: function(error) {
            this.changed.fire({
                changeType: "loadError",
                error: error
            });
            this.loadError.fire(error)
        },
        _handleDataChanged: function(args) {
            var currentTotalCount, that = this,
                dataSource = that._dataSource,
                isLoading = false,
                itemsCount = that.itemsCount();
            that._isLastPage = !itemsCount || !that.pageSize() || itemsCount < that.pageSize();
            if (that._isLastPage) {
                that._hasLastPage = true
            }
            if (dataSource.totalCount() >= 0) {
                if (dataSource.pageIndex() >= that.pageCount()) {
                    dataSource.pageIndex(that.pageCount() - 1);
                    dataSource.load();
                    isLoading = true
                }
            } else {
                currentTotalCount = dataSource.pageIndex() * that.pageSize() + itemsCount;
                that._currentTotalCount = Math.max(that._currentTotalCount, currentTotalCount);
                if (0 === itemsCount && dataSource.pageIndex() >= that.pageCount()) {
                    dataSource.pageIndex(that.pageCount() - 1);
                    if ("infinite" !== that.option("scrolling.mode")) {
                        dataSource.load();
                        isLoading = true
                    }
                }
            }
            if (!isLoading) {
                this.component._optionCache = {};
                this.changed.fire(args);
                this.component._optionCache = void 0
            }
        },
        _scheduleCustomLoadCallbacks: function(deferred) {
            var that = this;
            that._isCustomLoading = true;
            deferred.always(function() {
                that._isCustomLoading = false
            })
        },
        isLastPage: function() {
            return this._isLastPage
        },
        totalCount: function() {
            return parseInt(this._currentTotalCount || this._dataSource.totalCount())
        },
        itemsCount: function() {
            return this._dataSource.items().length
        },
        totalItemsCount: function() {
            return this.totalCount()
        },
        pageSize: function() {
            var dataSource = this._dataSource;
            if (!arguments.length && !dataSource.paginate()) {
                return 0
            }
            return dataSource.pageSize.apply(dataSource, arguments)
        },
        pageCount: function() {
            var that = this,
                count = that.totalItemsCount(),
                pageSize = that.pageSize();
            if (pageSize && count > 0) {
                return Math.max(1, Math.ceil(count / pageSize))
            }
            return 1
        },
        hasKnownLastPage: function() {
            return this._hasLastPage || this._dataSource.totalCount() >= 0
        },
        loadFromStore: function(loadOptions) {
            var dataSource = this._dataSource,
                d = new Deferred;
            if (!dataSource) {
                return
            }
            dataSource.store().load(loadOptions).done(function(data, extra) {
                if (data && !Array.isArray(data) && Array.isArray(data.data)) {
                    extra = data;
                    data = data.data
                }
                d.resolve(data, extra)
            }).fail(d.reject);
            return d
        },
        isCustomLoading: function() {
            return !!this._isCustomLoading
        },
        load: function(options) {
            var store, loadResult, dataSourceLoadOptions, that = this,
                dataSource = that._dataSource,
                d = new Deferred;
            if (options) {
                store = dataSource.store();
                dataSourceLoadOptions = dataSource.loadOptions();
                loadResult = {
                    storeLoadOptions: options,
                    isCustomLoading: true
                };
                each(store._customLoadOptions() || [], function(_, optionName) {
                    if (!(optionName in loadResult.storeLoadOptions)) {
                        loadResult.storeLoadOptions[optionName] = dataSourceLoadOptions[optionName]
                    }
                });
                that._scheduleCustomLoadCallbacks(d);
                dataSource._scheduleLoadCallbacks(d);
                that._handleDataLoading(loadResult);
                executeTask(function() {
                    if (!dataSource.store()) {
                        return d.reject("canceled")
                    }
                    when(loadResult.data || that.loadFromStore(loadResult.storeLoadOptions)).done(function(data, extra) {
                        loadResult.data = data;
                        loadResult.extra = extra || {};
                        that._handleDataLoaded(loadResult);
                        if (options.requireTotalCount && void 0 === loadResult.extra.totalCount) {
                            loadResult.extra.totalCount = store.totalCount(loadResult.storeLoadOptions)
                        }
                        when(loadResult.data, loadResult.extra.totalCount).done(function(data, totalCount) {
                            loadResult.extra.totalCount = totalCount;
                            d.resolve(data, loadResult.extra)
                        }).fail(d.reject)
                    }).fail(d.reject)
                }, that.option("loadingTimeout"));
                return d.fail(function() {
                    that.fireEvent("loadError", arguments)
                }).promise()
            } else {
                return dataSource.load()
            }
        },
        reload: function(full) {
            return full ? this._dataSource.reload() : this._dataSource.load()
        }
    }
}());
