import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { getToken } from 'src/utility/token';
import { Repository } from 'typeorm';
import { AccessEntity } from './access.entity';
import { IcynetActorEntity } from './icynet.entity';
import { ZoneEntity } from './zone.entity';

@Injectable()
export class ManagerService {
  constructor(
    @InjectRepository(AccessEntity)
    private access: Repository<AccessEntity>,
    @InjectRepository(ZoneEntity)
    private zone: Repository<ZoneEntity>,
    @InjectRepository(IcynetActorEntity)
    private actors: Repository<IcynetActorEntity>,
  ) {}

  public async getZoneForKey(key: string): Promise<ZoneEntity> {
    const keyData = await this.getKey(key);
    if (
      !keyData ||
      (keyData.expires_at && keyData.expires_at.getTime() < Date.now())
    )
      return null;
    return keyData.zone;
  }

  public async getKey(key: string): Promise<AccessEntity> {
    return this.access.findOne({
      where: { key },
      relations: ['zone'],
    });
  }

  public async getZone(zone: string): Promise<ZoneEntity> {
    return this.zone.findOne({
      where: {
        zone,
      },
    });
  }

  public async getAllKeys(zone: string): Promise<AccessEntity[]> {
    const obj = await this.getZone(zone);
    if (!obj) return [];

    return this.access.find({
      where: { zone: { id: obj.id } },
    });
  }

  public async getZonesByIcynetUUID(uuid: string): Promise<ZoneEntity[]> {
    const actor = await this.actors.findOne({
      where: { icynetUUID: uuid },
    });

    if (!actor) return [];

    return actor.zones;
  }

  /**
   * Create a new temporary API key for Icy Network user for their domain.
   * @param icynetUUID Icy Network user UUID
   * @param domain Zone name
   * @returns Access key when authorized
   */
  public async createIcynetAccessKey(
    icynetUUID: string,
    domain: string,
  ): Promise<AccessEntity> {
    const zones = await this.getZonesByIcynetUUID(icynetUUID);
    if (!zones.length) return null;

    const entry = zones.find((zone) => zone.zone === domain);
    if (!entry) return null;

    const newObject = {
      key: getToken(),
      zone: entry,
      expires_at: Date.now() + 24 * 60 * 60 * 1000,
    };

    return this.access.save(newObject);
  }

  /**
   * Grant access of a zone to an Icy Network user
   * @param icynetUUID Icy Network user UUID
   * @param domain Zone name
   */
  public async authorizeIcynetUser(
    icynetUUID: string,
    domain: string,
  ): Promise<boolean> {
    const zone = await this.getZone(domain);
    if (!zone) return false;

    const zones = await this.getZonesByIcynetUUID(icynetUUID);
    if (zones.length && zones.some((item) => item.zone === zone.zone)) {
      return false;
    }

    const actor = await this.actors.findOne({
      where: { icynetUUID },
    });

    actor.zones = [...zones, zone];
    await this.actors.save(actor);
    return true;
  }

  /**
   * Remove access of a zone from an Icy Network user
   * @param icynetUUID Icy Network user UUID
   * @param domain Zone name
   */
  public async revokeIcynetUser(
    icynetUUID: string,
    domain: string,
  ): Promise<boolean> {
    const zone = await this.getZone(domain);
    if (!zone) return false;

    const zones = await this.getZonesByIcynetUUID(icynetUUID);
    if (zones.length || !zones.some((item) => item.zone === zone.zone)) {
      return false;
    }

    const actor = await this.actors.findOne({
      where: { icynetUUID },
    });

    actor.zones = actor.zones.filter((item) => item.zone !== zone.zone);
    await this.actors.save(actor);
    return true;
  }

  /**
   * Create a new API token for accessing a zone.
   * @param domain Zone to access
   * @returns Access object
   */
  public async createToken(domain: string): Promise<AccessEntity> {
    const zone = await this.getZone(domain);
    if (!zone) return null;

    const newObject = {
      key: getToken(),
      zone,
    };

    return this.access.save(newObject);
  }

  /**
   * Add a new zone to be managed.
   * @param domain Zone to add
   * @returns Zone object
   */
  public async addZone(domain: string): Promise<ZoneEntity> {
    const zone = await this.getZone(domain);
    if (zone) return zone;

    return this.zone.save({
      zone: domain,
    });
  }
}