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

import { MessageSeverity } from '../enums/message-severity.enum';
import { Poll } from '../models/poll.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 messageService: MessageDisplayerService) {}

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

	// SAVE
	public async savePoll(poll: Poll): Promise<void> {
		await this.apiService.savePoll(poll);
		this.messageService.display(MessageSeverity.SUCCESS, 'Le sondage a été créé.');
	}

	public async saveVote(poll: Poll): Promise<void> {
		await this.apiService.saveVote(poll);
		this.messageService.display(MessageSeverity.SUCCESS, 'Votre participation au sondage a été enregistrée.');
	}

	public async saveComment(poll: Poll, comment: string): Promise<void> {
		await this.apiService.saveComment(poll, comment);
		this.messageService.display(MessageSeverity.SUCCESS, 'Votre commentaire a été enregistré.');
	}

	// GET
	public async getPollByIdentifier(slug: string): Promise<void> {
		const poll: Poll | undefined = await this.apiService.getPollByIdentifier(slug);
		if (poll) {
			this.updateCurrentPoll(poll);
		}
	}

	// DELETE
	public async deletePollVotes(poll: Poll): Promise<void> {
		await this.apiService.deletePollVotes(poll);
		this.messageService.display(
			MessageSeverity.SUCCESS,
			'Les participations des votants à ce sondage ont été supprimées.'
		);
	}

	public async deletePollComments(poll: Poll): Promise<void> {
		await this.apiService.deletePollComments(poll);
		this.messageService.display(MessageSeverity.SUCCESS, 'Les commentaires de ce sondage ont été supprimés.');
	}
}