import { Injectable } from '@angular/core';
import { ActivatedRouteSnapshot, Resolve, Router, RouterStateSnapshot } from '@angular/router';
import { BehaviorSubject, Observable } 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 { Form } from '@angular/forms';

@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();

	constructor(
		private router: Router,
		private apiService: ApiService,
		private userService: UserService,
		private uuidService: UuidService,
		private toastService: ToastService
	) {}

	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;
		}
	}

	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);
	}

	public async saveCurrentPoll(): Promise<void> {
		const pollUrl: string = await this.apiService.createPoll(this._poll.getValue());
		// TODO: Maybe handle the url to update currentPoll according to backend response
		if (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) {
		const newpoll = new Poll(
			this.userService.getCurrentUser(),
			this.uuidService.getUUID(),
			form.controls.title.value
		);
		return newpoll;
	}
}