import { Injectable } from '@angular/core';
import { BehaviorSubject, Observable } from 'rxjs';

import { MessageSeverity } from '../enums/message-severity.enum';
import { ResponseType } from '../enums/response-type.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 { MessageDisplayerService } from './message-displayer.service';

@Injectable({
	providedIn: 'root',
})
export class PollService {
	private _poll: BehaviorSubject<Poll | undefined> = new BehaviorSubject<Poll | undefined>(undefined);
	public readonly poll: Observable<Poll | undefined> = this._poll.asObservable();

	constructor(private apiService: ApiService, private messageDisplayerService: MessageDisplayerService) {}

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

	public async getPollBySlug(slug: string): Promise<void> {
		const poll: Poll | undefined = await this.apiService.getPollBySlug(slug);
		this.updateCurrentPoll(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.messageDisplayerService.display(MessageSeverity.SUCCESS, 'Le sondage a été enregistré.');
		} else {
			this.messageDisplayerService.display(
				MessageSeverity.ERROR,
				'Le sondage n’a été correctement enregistré, veuillez ré-essayer.'
			);
		}
	}

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

	public async deleteAllAnswers(): Promise<void> {
		await this.apiService.deletePollAnswers(this._poll.getValue().slug);
		this.messageDisplayerService.display(
			MessageSeverity.SUCCESS,
			'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.messageDisplayerService.display(MessageSeverity.SUCCESS, 'Votre commentaire a été enregistré.');
	}

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