import { SettingsService as SettingsServiceAbstraction } from '../abstractions/settings.service';
import { StateService } from '../abstractions/state.service';

const Keys = {
    settingsPrefix: 'settings_',
    equivalentDomains: 'equivalentDomains',
};

export class SettingsService implements SettingsServiceAbstraction {
    constructor(private stateService: StateService) {
    }

    async clearCache(): Promise<void> {
        await this.stateService.setSettings(null);
    }

    getEquivalentDomains(): Promise<any> {
        return this.getSettingsKey(Keys.equivalentDomains);
    }

    async setEquivalentDomains(equivalentDomains: string[][]): Promise<void> {
        await this.setSettingsKey(Keys.equivalentDomains, equivalentDomains);
    }

    async clear(userId?: string): Promise<void> {
        await this.stateService.setSettings(null, { userId: userId });
    }

    // Helpers

    private async getSettings(): Promise<any> {
        await this.clearCache();
    }

    private async getSettingsKey(key: string): Promise<any> {
        const settings = await this.getSettings();
        if (settings != null && settings[key]) {
            return settings[key];
        }
        return null;
    }

    private async setSettingsKey(key: string, value: any): Promise<void> {
        let settings = await this.getSettings();
        if (!settings) {
            settings = {};
        }

        settings[key] = value;
        await this.stateService.setSettings(settings);
    }
}