import {
  API,
  CharacteristicValue,
  Logging,
  PlatformAccessory,
  Service,
} from "homebridge";
import { getConfig, HiloConfig } from "../config";
import { Challenge, ChallengeAccessory } from "./types";
import { getLogger } from "../logger";
import { subHours } from "date-fns/subHours";

const phases: (
  challenge: Challenge,
  config: HiloConfig,
) => Record<string, { start: Date; end: Date } | undefined> = (
  challenge,
  config,
) => ({
  inProgress: {
    start: new Date(challenge.phases.preheatStartDateUTC),
    end: new Date(challenge.phases.recoveryEndDateUTC),
  },
  preheat: {
    start: new Date(challenge.phases.preheatStartDateUTC),
    end: new Date(challenge.phases.preheatEndDateUTC),
  },
  reduction: {
    start: new Date(challenge.phases.reductionStartDateUTC),
    end: new Date(challenge.phases.reductionEndDateUTC),
  },
  recovery: {
    start: new Date(challenge.phases.recoveryStartDateUTC),
    end: new Date(challenge.phases.recoveryEndDateUTC),
  },
  plannedAM:
    challenge.period === "am"
      ? {
          start: subHours(
            new Date(challenge.phases.preheatStartDateUTC),
            config.plannedHours,
          ),
          end: new Date(challenge.phases.preheatStartDateUTC),
        }
      : undefined,
  plannedPM:
    challenge.period === "pm"
      ? {
          start: subHours(
            new Date(challenge.phases.preheatStartDateUTC),
            config.plannedHours,
          ),
          end: new Date(challenge.phases.preheatStartDateUTC),
        }
      : undefined,
});

export class HiloChallengeSensor {
  private challenges: Record<number, NodeJS.Timeout[]> = {};
  protected service: Service | null = null;

  constructor(
    protected readonly accessory: PlatformAccessory<ChallengeAccessory>,
    protected readonly api: API,
    protected readonly logger: Logging = getLogger(),
  ) {
    accessory
      .getService(this.api.hap.Service.AccessoryInformation)!
      .setCharacteristic(this.api.hap.Characteristic.Manufacturer, "Hilo")
      .setCharacteristic(this.api.hap.Characteristic.Model, "Challenge")
      .setCharacteristic(
        this.api.hap.Characteristic.SerialNumber,
        this.accessory.context.v4Device.localId,
      );
    this.service =
      accessory.getService(this.api.hap.Service.ContactSensor) ||
      accessory.addService(this.api.hap.Service.ContactSensor);
    this.service.setCharacteristic(
      this.api.hap.Characteristic.Name,
      this.accessory.context.v4Device.phase + " Hilo Challenge",
    );
    this.service
      .getCharacteristic(this.api.hap.Characteristic.ContactSensorState)
      .onGet(this.getContactSensorState.bind(this));
  }

  updateChallenge(value: boolean) {
    this.accessory.context.v4Device.value = value;
    this.service
      ?.getCharacteristic(this.api.hap.Characteristic.ContactSensorState)
      ?.updateValue(value);
  }

  private async getContactSensorState(): Promise<CharacteristicValue> {
    const activeChallenge = this.accessory.context.v4Device.value ?? false;
    this.logger.debug(`Getting active Hilo Challenge: ${activeChallenge}`);
    return activeChallenge;
  }

  async updateChallengeStatus(challenges: Challenge[]) {
    challenges.forEach((challenge) => {
      if (challenge.isParticipating) {
        this.participating(challenge);
      } else {
        this.notParticipating(challenge);
      }
    });
    if (
      challenges.filter((challenge) => challenge.isParticipating).length === 0
    ) {
      this.updateChallengeValue(false);
    }
  }

  private updateChallengeValue(active: boolean) {
    this.updateChallenge(active);
  }

  private participating(challenge: Challenge) {
    if (this.challenges[challenge.id]) {
      return;
    }
    this.challenges[challenge.id] = [];
    const devicePhase = this.accessory.context.v4Device.phase;
    const phase = phases(challenge, getConfig())[devicePhase];
    const startPhase = phase?.start;
    const endPhase = phase?.end;
    if (!startPhase || !endPhase) {
      this.logger.debug(
        `Could not find phase or period does not match device for device ${this.accessory.context.v4Device.localId} - ${this.accessory.context.v4Device.phase}`,
      );
      return;
    }
    const startsIn = startPhase.getTime() - new Date().getTime();
    const endsIn = endPhase.getTime() - new Date().getTime();
    if (startsIn >= 0) {
      this.challenges[challenge.id].push(
        setTimeout(() => {
          this.updateChallengeValue(true);
        }, startsIn),
      );
    } else if (startsIn < 0 && endsIn > 0) {
      this.updateChallengeValue(true);
    }
    if (endsIn >= 0) {
      this.challenges[challenge.id].push(
        setTimeout(() => {
          this.updateChallengeValue(false);
          delete this.challenges[challenge.id];
        }, endsIn),
      );
    } else {
      this.updateChallengeValue(false);
      delete this.challenges[challenge.id];
    }
  }

  private notParticipating(challenge: Challenge) {
    if (this.challenges[challenge.id]) {
      this.challenges[challenge.id].forEach((timeout) => clearTimeout(timeout));
      delete this.challenges[challenge.id];
    }
  }
}