import { ChangeDetectorRef, Inject, Injectable } from '@angular/core';
import { ActivatedRoute, ActivatedRouteSnapshot, Resolve, Router, RouterStateSnapshot } from '@angular/router';
import { BehaviorSubject, Observable, Subscription } from 'rxjs';

import { Answer } from '../enums/answer.enum';
import { Choice } from '../models/choice.model';
import { Poll } from '../models/poll.model';
import { User } from '../models/user.model';
import { ApiService } from './api.service';
import { ToastService } from './toast.service';
import { UserService } from './user.service';
import { UuidService } from './uuid.service';
import { HttpClient } from '@angular/common/http';
import { environment } from '../../../environments/environment';
import { FormArray, FormBuilder, FormGroup, Validators } from '@angular/forms';
import { DateChoice, defaultTimeOfDay, otherDefaultDates } from '../../features/old-stuff/config/defaultConfigs';
import { DateUtilities } from '../../features/old-stuff/config/DateUtilities';
import { DOCUMENT } from '@angular/common';

@Injectable({
	providedIn: 'root',
})
export class PollService implements Resolve<Poll> {
	private _poll: BehaviorSubject<Poll | undefined> = new BehaviorSubject<Poll | undefined>(undefined);
	public readonly poll: Observable<Poll | undefined> = this._poll.asObservable();
	public form: FormGroup;
	public startDateInterval: string;
	public endDateInterval: string;
	public intervalDays: any;
	public intervalDaysDefault = 7;
	public dateList: DateChoice[] = otherDefaultDates; // sets of days as strings, config to set identical time for days in a special days poll
	public timeList: any = defaultTimeOfDay; // ranges of time expressed as strings
	public previousRouteName: string = '/administration';
	public nextRouteName: string = '/administration/step/2';
	public step_current: number = 1;
	public step_max: number = 5;
	public round: Function;
	public urlPrefix: string = window.location.origin + '/participation/';
	public advancedDisplayEnabled = false;
	public showDateInterval = false;
	public allowSeveralHours = false;
	public richTextMode = false;

	constructor(
		private http: HttpClient,
		private router: Router,
		private apiService: ApiService,
		private userService: UserService,
		private uuidService: UuidService,
		private toastService: ToastService,
		public dateUtilities: DateUtilities,
		public route: ActivatedRoute,
		@Inject(DOCUMENT) private document: any,
		private fb: FormBuilder
	) {
		this.createFormGroup();
		if (environment.poll.autoFillDemo) {
			this.setDemoValues();
		}
	}

	/**
	 * add example values to the form
	 */
	setDemoValues(): void {
		this.addChoice('orange');
		this.addChoice('raisin');
		this.addChoice('abricot');

		this.form.patchValue({
			title: 'mon titre',
			description: 'répondez SVP <3 ! *-* ',
			custom_url: this.uuidService.getUUID(),
			creatorPseudo: 'Chuck Norris',
			creatorEmail: 'chucknorris@example.com',
			isAboutDate: true,
			whoModifiesAnswers: 'everybody',
			whoCanChangeAnswers: 'everybody',
			isProtectedByPassword: false,
			isOwnerNotifiedByEmailOnNewVote: false,
			isOwnerNotifiedByEmailOnNewComment: false,
			isMaybeAnswerAvailable: false,
			richTextMode: false,
			areResultsPublic: true,
			expiracyNumberOfDays: 60,
		});
		this.automaticSlug();
	}

	/**
	 * set the poll slug from other data of the poll
	 */
	automaticSlug() {
		this.form.patchValue({ custom_url: this.makeSlug(this.form) });
	}

	public createFormGroup() {
		let form = this.fb.group({
			title: ['', [Validators.required, Validators.minLength(12)]],
			creatorPseudo: ['', [Validators.required]],
			created_at: [new Date(), [Validators.required]],
			creatorEmail: ['', [Validators.required]],
			custom_url: [this.uuidService.getUUID(), [Validators.required]],
			description: ['', [Validators.required]],
			choices: new FormArray([]),
			whoModifiesAnswers: ['', [Validators.required]],
			whoCanChangeAnswers: ['', [Validators.required]],
			isAboutDate: [true, [Validators.required]],
			startDateInterval: ['', [Validators.required]],
			endDateInterval: ['', [Validators.required]],
			isProtectedByPassword: [false, [Validators.required]],
			isOwnerNotifiedByEmailOnNewVote: [false, [Validators.required]],
			isOwnerNotifiedByEmailOnNewComment: [false, [Validators.required]],
			isMaybeAnswerAvailable: [false, [Validators.required]],
			areResultsPublic: [true, [Validators.required]],
			richTextMode: [false, [Validators.required]],
			expiracyNumberOfDays: [60, [Validators.required, Validators.min(0)]],
		});
		this.form = form;
		return form;
	}

	/**
	 * auto fetch a poll when route is looking for one in the administration pattern
	 * @param route
	 * @param state
	 */
	public async resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Promise<Poll> {
		const segments: string[] = state.url.split('/');
		const wantedSlug: string = segments.includes('poll') ? segments[segments.indexOf('poll') + 1] : '';
		if (!wantedSlug && state.url.includes('administration')) {
			// creation of new poll
			const poll = new Poll(this.userService.getCurrentUser(), this.uuidService.getUUID(), '');
			this._poll.next(poll);
			this.router.navigate(['poll/' + poll.slug + '/administration']);
		}
		if (!this._poll.getValue() || !this._poll.getValue().slug || this._poll.getValue().slug !== wantedSlug) {
			await this.loadPollBySlug(wantedSlug);
		}
		if (this._poll.getValue()) {
			return this._poll.getValue();
		} else {
			this.router.navigate(['page-not-found']);
			return;
		}
	}

	getAllAvailablePolls() {
		const baseHref = environment.api.version.apiV1.baseHref;
		console.log('getAllAvailablePolls baseHref', baseHref);
		const headers = ApiService.makeHeaders();
		console.log('getAllAvailablePolls headers', headers);
		try {
			this.http.get(`${baseHref}/poll`, headers).subscribe((res: Observable<any>) => {
				console.log('getAllAvailablePolls res', res);
			});
		} catch (e) {
			console.log('getAllAvailablePolls e', e);
		}
	}

	public async loadPollBySlug(slug: string): Promise<void> {
		console.log('slug', slug);
		if (slug) {
			const poll: Poll | undefined = await this.apiService.getPollBySlug(slug);
			console.log({ loadPollBySlugResponse: poll });
			this.updateCurrentPoll(poll);
		}
	}

	public updateCurrentPoll(poll: Poll): void {
		this._poll.next(poll);
	}

	/**
	 * add all the dates between the start and end dates in the interval section
	 */
	addIntervalOfDates(): void {
		const newIntervalArray = this.dateUtilities.getDatesInRange(
			this.dateUtilities.parseInputDateToDateObject(this.startDateInterval),
			this.dateUtilities.parseInputDateToDateObject(this.endDateInterval),
			1
		);

		const converted = [];
		newIntervalArray.forEach((element) => {
			converted.push({
				literal: element.literal,
				date_object: element.date_object,
				timeList: [],
			});
		});
		this.dateList = [...new Set(converted)];
		// add only dates that are not already present with a Set of unique items
		console.log('this.dateList', this.dateList);
		this.showDateInterval = false;

		this.form.patchValue({ choices: this.dateList });

		this.toastService.display(`les dates ont été ajoutées aux réponses possibles.`);
	}

	/**
	 * handle keyboard shortcuts
	 * @param $event
	 * @param choice_number
	 */
	keyOnChoice($event: KeyboardEvent, choice_number: number): void {
		$event.preventDefault();

		console.log('this.choices.length', this.choices.length);
		console.log('choice_number', choice_number);
		const lastChoice = this.choices.length - 1 === choice_number;
		// reset field with Ctrl + D
		// add a field with Ctrl + N
		// go to previous choice with arrow up
		// go to next choice with arrow down
		console.log('$event', $event);

		if ($event.key == 'ArrowUp' && choice_number > 0) {
			this.focusOnChoice(choice_number - 1);
		}
		if ($event.key == 'ArrowDown') {
			// add a field if we are on the last choice
			if (lastChoice) {
				this.addChoice();
				this.toastService.display('choix ajouté par raccourci "flèche bas"');
			} else {
				this.focusOnChoice(choice_number + 1);
			}
		}
		if ($event.ctrlKey && $event.key == 'Backspace') {
			this.deleteChoiceField(choice_number);
			this.toastService.display('choix supprimé par raccourci "Ctrl + retour"');
			this.focusOnChoice(Math.min(choice_number - 1, 0));
		}
		if ($event.ctrlKey && $event.key == 'Enter') {
			// go to other fields
			const elem = this.document.querySelector('#creatorEmail');
			if (elem) {
				elem.focus();
			}
		}
	}

	/**
	 * change time spans
	 */
	addTime() {
		this.timeList.push({
			literal: '',
			timeList: [],
			date_object: new Date(),
		});
	}

	removeAllTimes() {
		this.timeList = [];
	}

	resetTimes() {
		this.timeList = otherDefaultDates;
	}

	/**
	 * add a time period to a specific date choice,
	 * focus on the new input
	 * @param config
	 * @param id
	 */
	addTimeToDate(config: any, id: number) {
		this.timeList.push({
			literal: '',
			timeList: [],
			date_object: new Date(),
		});
		const selector = '[ng-reflect-choice_label="dateTime_' + id + '_Choices_' + (this.timeList.length - 1) + '"]';
		const elem = this.document.querySelector(selector);
		if (elem) {
			elem.focus();
		}
	}

	public createPoll(): void {
		console.log('this.form', this.form);
		const newpoll = this.newPollFromForm(this.form);
		console.log('newpoll', newpoll);
		this.apiService.createPoll(newpoll);
	}

	/**
	 * default interval of dates proposed is from today to 7 days more
	 */
	setDefaultDatesForInterval(): void {
		const dateCurrent = new Date();
		const dateJson = dateCurrent.toISOString();
		this.startDateInterval = dateJson.substring(0, 10);
		this.endDateInterval = this.dateUtilities
			.addDaysToDate(this.intervalDaysDefault, dateCurrent)
			.toISOString()
			.substring(0, 10);
		this.form.patchValue({
			startDateInterval: this.startDateInterval,
			endDateInterval: this.endDateInterval,
		});
		this.countDays();
	}

	askInitFormDefault(): void {
		this.initFormDefault(false);
		this.toastService.display('formulaire réinitialisé');
	}

	countDays(): void {
		this.intervalDays = this.dateUtilities.countDays(
			this.dateUtilities.parseInputDateToDateObject(this.startDateInterval),
			this.dateUtilities.parseInputDateToDateObject(this.endDateInterval)
		);
	}

	focusOnChoice(index): void {
		const selector = '#choice_label_' + index;
		const elem = this.document.querySelector(selector);
		if (elem) {
			elem.focus();
		}
	}

	deleteChoiceField(index: number): void {
		if (this.choices.length !== 1) {
			this.choices.removeAt(index);
		}
	}

	initFormDefault(showDemoValues = true): void {
		this.form = this.createFormGroup();
		console.log('this.form ', this.form);
		this.setDefaultDatesForInterval();

		if (showDemoValues) {
			this.setDemoValues();
		}
	}

	get choices(): FormArray {
		return this.form.get('choices') as FormArray;
	}

	reinitChoices(): void {
		this.choices.setValue([]);
	}

	addChoice(optionalLabel = ''): void {
		const newControlGroup = this.fb.group({
			label: this.fb.control('', [Validators.required]),
			imageUrl: ['', [Validators.required]],
		});

		if (optionalLabel) {
			newControlGroup.patchValue({
				label: optionalLabel,
				imageUrl: 'mon url',
			});
		}
		this.choices.push(newControlGroup);
		console.log('this.choices.length', this.choices.length);

		this.focusOnChoice(this.choices.length - 1);
	}

	/**
	 *  make a uniq slug for the current poll creation
	 * @param form
	 */
	makeSlug(form: FormGroup): string {
		let str = '';
		str =
			form.value.created_at.getFullYear() +
			'_' +
			(form.value.created_at.getMonth() + 1) +
			'_' +
			form.value.created_at.getDate() +
			'_' +
			form.value.creatorPseudo +
			'_' +
			form.value.title;
		str = str.replace(/^\s+|\s+$/g, ''); // trim
		str = str.toLowerCase();

		// remove accents, swap ñ for n, etc
		const from = 'àáäâèéëêìíïîòóöôùúüûñç·/_,:;';
		const to = 'aaaaeeeeiiiioooouuuunc------';
		for (let i = 0, l = from.length; i < l; i++) {
			str = str.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
		}

		str = str
			.replace(/[^a-z0-9 -]/g, '') // remove invalid chars
			.replace(/\s+/g, '-') // collapse whitespace and replace by -
			.replace(/-+/g, '-'); // collapse dashes

		return str + '-' + this.uuidService.getUUID();
	}

	public async saveCurrentPoll(): Promise<void> {
		const pollUrl: Subscription = await this.apiService.createPoll(this._poll.getValue());
		// TODO: Maybe handle the url to update currentPoll according to backend response
		if (pollUrl) {
			console.log('pollUrl', pollUrl);
			this.toastService.display('Le sondage a été enregistré.');
		} else {
			this.toastService.display('Le sondage n’a été correctement enregistré, veuillez ré-essayer.');
		}
	}

	public saveParticipation(choice: Choice, user: User, response: Answer): void {
		const currentPoll = this._poll.getValue();
		currentPoll.choices.find((c) => c.label === choice.label)?.updateParticipation(user, response);
		this.updateCurrentPoll(currentPoll);
		this.apiService.createParticipation(currentPoll.slug, choice.label, user.pseudo, response);
		this.toastService.display('Votre participation au sondage a été enregistrée.');
	}

	public async deleteAllAnswers(): Promise<void> {
		await this.apiService.deletePollAnswers(this._poll.getValue().slug);
		this.toastService.display('Les participations des votants à ce sondage ont été supprimées.');
	}

	public async addComment(comment: string): Promise<void> {
		await this.apiService.createComment(this._poll.getValue().slug, comment);
		this.toastService.display('Votre commentaire a été enregistré.');
	}

	public async deleteComments(): Promise<void> {
		await this.apiService.deletePollComments(this._poll.getValue().slug);
		this.toastService.display('Les commentaires de ce sondage ont été supprimés.');
	}

	public buildAnswersByChoiceLabelByPseudo(poll: Poll): Map<string, Map<string, Answer>> {
		const pseudos: Set<string> = new Set();
		poll.choices.forEach((choice: Choice) => {
			choice.participants.forEach((users: Set<User>) => {
				users.forEach((user: User) => {
					pseudos.add(user.pseudo);
				});
			});
		});

		const list = new Map<string, Map<string, Answer>>();
		pseudos.forEach((pseudo: string) => {
			list.set(
				pseudo,
				new Map<string, Answer>(
					poll.choices.map((choice: Choice) => {
						return [choice.label, undefined];
					})
				)
			);
		});

		poll.choices.forEach((choice: Choice) => {
			choice.participants.forEach((users: Set<User>, answer: Answer) => {
				users.forEach((user: User) => {
					list.get(user.pseudo).set(choice.label, answer);
				});
			});
		});

		return list;
	}

	newPollFromForm(form: any): any {
		const newpoll = new Poll(
			this.userService.getCurrentUser(),
			this.uuidService.getUUID(),
			form.controls.title.value
		);
		/**
		 * convert to API version 1 config poll
		 */
		const apiV1Poll = {
			menuVisible: true,
			expiracyDateDefaultInDays: newpoll.configuration.expiresDaysDelay,
			deletionDateAfterLastModification: newpoll.configuration.expiracyAfterLastModificationInDays,
			pollType: newpoll.configuration.isAboutDate ? 'dates' : 'classic', // classic or dates
			title: newpoll.title,
			description: newpoll.description,
			myName: newpoll.owner.pseudo,
			myComment: '',
			isAdmin: true, // when we create a poll, we are admin on it
			myVoteStack: {},
			myTempVoteStack: 0,
			myEmail: newpoll.owner.email,
			myPolls: [], // list of retrieved polls from the backend api
			/*
				 date specific poll, we have the choice to setup different hours (timeList) for all possible dates (dateList), or use the same hours for all dates
				*/
			allowSeveralHours: 'true',
			// access
			visibility: newpoll.configuration.areResultsPublic, // visible to one with the link:
			voteChoices: newpoll.configuration.isMaybeAnswerAvailable ? 'yes, maybe, no' : 'yes', // possible answers to a vote choice: only "yes", "yes, maybe, no"
			created_at: new Date(),
			expirationDate: '', // expiracy date
			voteStackId: null, // id of the vote stack to update
			pollId: null, // id of the current poll when created. data given by the backend api
			pollSlug: null, // id of the current poll when created. data given by the backend api
			currentPoll: null, // current poll selected with createPoll or getPoll of ConfigService
			passwordAccess: newpoll.configuration.isProtectedByPassword,
			password: newpoll.configuration.password,
			customUrl: newpoll.slug, // custom slug in the url, must be unique
			customUrlIsUnique: null, // given by the backend
			urlSlugPublic: null,
			urlPublic: null,
			urlAdmin: null,
			adminKey: '', // key to change config of the poll
			owner_modifier_token: '', // key to change a vote stack
			canModifyAnswers: newpoll.configuration.isAllowingtoChangeOwnAnswers, // bool for the frontend selector
			whoModifiesAnswers: newpoll.configuration.whoCanChangeAnswers, // everybody, self, nobody (: just admin)
			whoCanChangeAnswers: newpoll.configuration.whoCanChangeAnswers, // everybody, self, nobody (: just admin)
			dateList: newpoll.dateChoices, // sets of days as strings, config to set identical time for days in a special days poll
			timeList: newpoll.timeChoices, // ranges of time expressed as strings

			answers: newpoll.choices,
			// modals
			displayConfirmVoteModalAdmin: false,
		};
		console.log('apiV1Poll', apiV1Poll);
		return apiV1Poll;
	}
}