import { Injectable } from '@angular/core';
import { OperatorService } from '../../../core/services/operator.service';
import { ViewMotion } from '../models/view-motion';
import { ConfigService } from '../../../core/services/config.service';


@Injectable({
  providedIn: 'root'
})
export class LocalPermissionsService {

    public configMinSupporters: number;

    public constructor(
        private operator: OperatorService,
        private configService: ConfigService,
    ) {
        // load config variables
        this.configService.get('motions_min_supporters').subscribe(
            (supporters: number): void => {
                this.configMinSupporters = supporters;
            }
        );
    }

    /**
     * Should determine if the user (Operator) has the
     * correct permission to perform the given action.
     *
     * actions might be:
     * - support
     *
     * @param action the action the user tries to perform
     */
    public isAllowed(action: string, motion?: ViewMotion): boolean {
        if (motion) {
            switch (action) {
                case 'support':
                    return (
                        this.operator.hasPerms('motions.can_support') &&
                        this.configMinSupporters > 0 &&
                        motion.state.allow_support &&
                        (motion.submitters.indexOf(this.operator.user) === -1) &&
                        (motion.supporters.indexOf(this.operator.user) === -1));
                case 'unsupport':
                    return (
                        motion.state.allow_support &&
                        (motion.supporters.indexOf(this.operator.user) !== -1)
                    );
                default:
                    return false;
            }
        }
    }
}