// (C) Copyright 2015 Martin Dougiamas
//
// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import { Component, OnDestroy, ViewChild } from '@angular/core';
import { IonicPage } from 'ionic-angular';
import { CoreEventsProvider } from '@providers/events';
import { CoreSitesProvider } from '@providers/sites';
import { AddonMessagesProvider } from '../../providers/messages';
import { CoreSplitViewComponent } from '@components/split-view/split-view';
import { CoreDomUtilsProvider } from '@providers/utils/dom';
import { CoreAppProvider } from '@providers/app';

/**
 * Page for searching users.
 */
@IonicPage({ segment: 'addon-messages-search' })
@Component({
    selector: 'page-addon-messages-search',
    templateUrl: 'search.html',
})
export class AddonMessagesSearchPage implements OnDestroy {

    disableSearch = false;
    displaySearching = false;
    displayResults = false;
    query = '';
    contacts = {
        type: 'contacts',
        titleString: 'addon.messages.contacts',
        emptyString: 'addon.messages.searchnocontactsfound',
        results: [],
        canLoadMore: false,
        loadingMore: false
    };
    nonContacts = {
        type: 'noncontacts',
        titleString: 'addon.messages.noncontacts',
        emptyString: 'addon.messages.searchnononcontactsfound',
        results: [],
        canLoadMore: false,
        loadingMore: false
    };
    messages = {
        type: 'messages',
        titleString: 'addon.messages.messages',
        emptyString: 'addon.messages.searchnomessagesfound',
        results: [],
        canLoadMore: false,
        loadingMore: false,
        loadMoreError: false
    };
    selectedResult = null;

    protected memberInfoObserver;

    @ViewChild(CoreSplitViewComponent) splitviewCtrl: CoreSplitViewComponent;

    constructor(private appProvider: CoreAppProvider, private domUtils: CoreDomUtilsProvider, eventsProvider: CoreEventsProvider,
            sitesProvider: CoreSitesProvider, private messagesProvider: AddonMessagesProvider) {

        // Update block status of a user.
        this.memberInfoObserver = eventsProvider.on(AddonMessagesProvider.MEMBER_INFO_CHANGED_EVENT, (data) => {
            if (!data.userBlocked && !data.userUnblocked) {
                // The block status has not changed, ignore.
                return;
            }

            const contact = this.contacts.results.find((user) => user.id == data.userId);
            if (contact) {
                contact.isblocked = data.userBlocked;
            } else {
                const nonContact = this.nonContacts.results.find((user) => user.id == data.userId);
                if (nonContact) {
                    nonContact.isblocked = data.userBlocked;
                }
            }

            this.messages.results.forEach((message: any): void => {
                if (message.userid == data.userId) {
                    message.isblocked = data.userBlocked;
                }
            });
        }, sitesProvider.getCurrentSiteId());
    }

    /**
     * Clear search.
     */
    clearSearch(): void {
        this.query = '';
        this.displayResults = false;
        this.splitviewCtrl.emptyDetails();
    }

    /**
     * Start a new search or load more results.
     *
     * @param {string} query Text to search for.
     * @param {strings} loadMore Load more contacts, noncontacts or messages. If undefined, start a new search.
     * @param {any} [infiniteComplete] Infinite scroll complete function. Only used from core-infinite-loading.
     * @return {Promise<any>} Resolved when done.
     */
    search(query: string, loadMore?: 'contacts' | 'noncontacts' | 'messages', infiniteComplete?: any): Promise<any> {
        this.appProvider.closeKeyboard();

        this.query = query;
        this.disableSearch = true;
        this.displaySearching = !loadMore;

        const promises = [];
        let newContacts = [];
        let newNonContacts = [];
        let newMessages = [];
        let canLoadMoreContacts = false;
        let canLoadMoreNonContacts = false;
        let canLoadMoreMessages = false;

        if (!loadMore || loadMore == 'contacts' || loadMore == 'noncontacts') {
            const limitNum = loadMore ? AddonMessagesProvider.LIMIT_SEARCH : AddonMessagesProvider.LIMIT_INITIAL_USER_SEARCH;
            let limitFrom = 0;
            if (loadMore == 'contacts') {
                limitFrom = this.contacts.results.length;
                this.contacts.loadingMore = true;
            } else if (loadMore == 'noncontacts') {
                limitFrom = this.nonContacts.results.length;
                this.nonContacts.loadingMore = true;
            }

            promises.push(
                this.messagesProvider.searchUsers(query, limitFrom, limitNum).then((result) => {
                    if (!loadMore || loadMore == 'contacts') {
                        newContacts = result.contacts;
                        canLoadMoreContacts = result.canLoadMoreContacts;
                    }
                    if (!loadMore || loadMore == 'noncontacts') {
                        newNonContacts = result.nonContacts;
                        canLoadMoreNonContacts = result.canLoadMoreNonContacts;
                    }
                })
            );
        }

        if (!loadMore || loadMore == 'messages') {
            let limitFrom = 0;
            if (loadMore == 'messages') {
                limitFrom = this.messages.results.length;
                this.messages.loadingMore = true;
            }

            promises.push(
                this.messagesProvider.searchMessages(query, undefined, limitFrom).then((result) => {
                    newMessages = result.messages;
                    canLoadMoreMessages = result.canLoadMore;
                })
            );
        }

        return Promise.all(promises).then(() => {
            if (!loadMore) {
                this.contacts.results = [];
                this.nonContacts.results = [];
                this.messages.results = [];
            }

            this.displayResults = true;

            if (!loadMore || loadMore == 'contacts') {
                this.contacts.results.push(...newContacts);
                this.contacts.canLoadMore = canLoadMoreContacts;
            }

            if (!loadMore || loadMore == 'noncontacts') {
                this.nonContacts.results.push(...newNonContacts);
                this.nonContacts.canLoadMore = canLoadMoreNonContacts;
            }

            if (!loadMore || loadMore == 'messages') {
                this.messages.results.push(...newMessages);
                this.messages.canLoadMore = canLoadMoreMessages;
                this.messages.loadMoreError = false;
            }

            if (!loadMore) {
                if (this.contacts.results.length > 0) {
                    this.openConversation(this.contacts.results[0], true);
                } else if (this.nonContacts.results.length > 0) {
                    this.openConversation(this.nonContacts.results[0], true);
                } else if (this.messages.results.length > 0) {
                    this.openConversation(this.messages.results[0], true);
                }
            }
        }).catch((error) => {
            this.domUtils.showErrorModalDefault(error, 'addon.messages.errorwhileretrievingusers', true);

            if (loadMore == 'messages') {
                this.messages.loadMoreError = true;
            }
        }).finally(() => {
            this.disableSearch = false;
            this.displaySearching = false;

            if (loadMore == 'contacts') {
                this.contacts.loadingMore = false;
            } else if (loadMore == 'noncontacts') {
                this.nonContacts.loadingMore = false;
            } else if (loadMore == 'messages') {
                this.messages.loadingMore = false;
            }

            infiniteComplete && infiniteComplete();
        });
    }

    /**
     * Open a conversation in the split view.
     *
     * @param {any} result User or message.
     * @param {boolean} [onInit=false] Whether the tser was selected on initial load.
     */
    openConversation(result: any, onInit: boolean = false): void {
        if (!onInit || this.splitviewCtrl.isOn()) {
            this.selectedResult = result;
            const params: any = {};
            if (result.conversationid) {
                params.conversationId = result.conversationid;
            } else {
                params.userId = result.id;
            }
            this.splitviewCtrl.push('AddonMessagesDiscussionPage', params);
        }
    }

    /**
     * Component destroyed.
     */
    ngOnDestroy(): void {
        this.memberInfoObserver && this.memberInfoObserver.off();
    }
}