import { Logging } from "homebridge";
import { inject, injectable } from "tsyringe";
import { HarmonyDataProvider } from "../dataProviders/harmonyDataProvider";
import { StateDataProvider } from "../dataProviders/stateDataProvider";
import { IActivityState } from "../models/activityState";
import {
  IActivity,
  IConfig,
  IDeviceSetupItem,
  IInput,
  IOutput,
} from "../models/config";
import { HarmonyDevice } from "../models/harmonyDevice";

@injectable()
export class ActivityService {
  constructor(
    @inject(HarmonyDataProvider)
    private _harmonyDataProvider: HarmonyDataProvider,
    @inject(StateDataProvider) private _stateDataProvider: StateDataProvider,
    @inject("IConfig") private _config: IConfig,
    @inject("log") private _log: Logging
  ) {}

  public startLastOrDefaultActivity = async (
    controlUnitName: string,
    defaultActivity: IActivity
  ) => {
    const lastActivity = this.getLastActivity(controlUnitName);
    if (!lastActivity) {
      return this.startActivity(controlUnitName, defaultActivity);
    }

    return this.startActivity(controlUnitName, lastActivity);
  };

  public startActivity = async (
    controlUnitName: string,
    activity: IActivity
  ) => {
    this._log.info(
      `Starting activity ${activity.DisplayName} for controlUnit: ${controlUnitName}`
    );
    let devicesToTurnOn: Array<HarmonyDevice> = this.getDevicesToTurnOn(
      activity,
      controlUnitName
    );

    await this._harmonyDataProvider.powerOnDevices(devicesToTurnOn);

    await this.assignDeviceInput(activity);

    await this.routeInputsToOutputs(activity);

    let lastActivity = this.getCurrentActivity(controlUnitName);

    let devicesToTurnOff: Array<HarmonyDevice> = this.getDevicesToTurnOff(
      controlUnitName,
      lastActivity,
      activity
    );
    await this._harmonyDataProvider.powerOffDevices(devicesToTurnOff);

    this._stateDataProvider.updateState(activity, controlUnitName);
  };

  public stopCurrentActivity = async (
    controlUnitName: string
  ): Promise<void> => {
    if (!this.getCurrentActivity(controlUnitName)) {
      return;
    }

    let lastActivity: IActivity | undefined =
      this.getCurrentActivity(controlUnitName);

    let devicesToTurnOff: Array<HarmonyDevice> = this.getDevicesToTurnOff(
      controlUnitName,
      lastActivity
    );
    await this._harmonyDataProvider.powerOffDevices(devicesToTurnOff);

    this._stateDataProvider.deactivateState(controlUnitName);
  };

  public getCurrentActivity(controlUnitName: string): IActivity | undefined {
    return this._stateDataProvider.getState(controlUnitName)?.currentActivity;
  }

  public getLastActivity(controlUnitName: string): IActivity | undefined {
    return this._stateDataProvider.getState(controlUnitName)?.lastActivity;
  }

  /**
   * Return if a control unit is active
   * @param controlUnitName
   */
  public getIsActive(controlUnitName: string): boolean {
    const state = this._stateDataProvider.getState(controlUnitName);
    return state != undefined && state.currentActivity != undefined;
  }

  /**
   * Helper function to make sure no control unit depends on device list.
   * @param devicesToTurnOn The list of devices to modify.
   * @param controlUnitName The name of the control unit in question.
   */
  private sanitizeDeviceList(
    devicesToTurnOn: Array<HarmonyDevice>,
    controlUnitName: string
  ): Array<HarmonyDevice> {
    for (let controlUnitKey in this._stateDataProvider.states) {
      //Skip self
      if (controlUnitKey === controlUnitName) {
        continue;
      }
      let currentOtherState: IActivityState =
        this._stateDataProvider.states[controlUnitKey]!;

      if (!currentOtherState || !currentOtherState.currentActivity) {
        return devicesToTurnOn;
      }

      currentOtherState.currentActivity!.DeviceSetupList.forEach(
        (value: IDeviceSetupItem) => {
          //there are devices to remove
          if (devicesToTurnOn.some((e) => e && e.name === value.DeviceName)) {
            let deviceToRemove: HarmonyDevice = devicesToTurnOn.filter(
              (i) => i.name === value.DeviceName
            )[0];
            delete devicesToTurnOn[devicesToTurnOn.indexOf(deviceToRemove)];
          }
        }
      );
    }

    return devicesToTurnOn;
  }

  private getDevicesToTurnOn(
    activity: IActivity,
    controlUnitName: string
  ): Array<HarmonyDevice> {
    let potentialDevices = this.buildPotentialDeviceList(activity);
    return this.sanitizeDeviceList(potentialDevices, controlUnitName);
  }

  private getDevicesToTurnOff(
    controlUnitName: string,
    lastActivity?: IActivity,
    nextActivity?: IActivity
  ) {
    let potentialDevices = lastActivity
      ? this.buildPotentialDeviceList(lastActivity)
      : [];

    //remove devices that will be used for next activity from list
    //delete array[index] is stupid because it just nulls out the index. But now i have to deal with nulls
    if (nextActivity) {
      potentialDevices.forEach((device: HarmonyDevice, index: number) => {
        if (
          device &&
          device.name &&
          nextActivity.DeviceSetupList.some((e) => {
            return e && e.DeviceName === device.name;
          })
        ) {
          delete potentialDevices[index];
        }
      });
    }

    return this.sanitizeDeviceList(potentialDevices, controlUnitName);
  }

  private buildPotentialDeviceList(activity: IActivity): HarmonyDevice[] {
    return activity.DeviceSetupList.map(
      (value: IDeviceSetupItem): HarmonyDevice => {
        return this._harmonyDataProvider.getDeviceByName(value.DeviceName);
      }
    );
  }

  private async assignDeviceInput(activity: IActivity): Promise<void> {
    await Promise.all(
      activity.DeviceSetupList.map(async (value: IDeviceSetupItem) => {
        let device: HarmonyDevice = this._harmonyDataProvider.getDeviceByName(
          value.DeviceName
        );

        if (device && device.supportsCommand(`Input${value.Input}`)) {
          await this._harmonyDataProvider.sendCommand(
            `Input${value.Input}`,
            device
          );
        }
      })
    );
  }

  private async routeInputsToOutputs(activity: IActivity) {
    if (activity.UseMatrix) {
      //get input and output
      let input: IInput = this._config.Matrix.Inputs.filter(
        (e) => e.InputDevice === activity.ControlDevice
      )[0];
      let output: IOutput = this._config.Matrix.Outputs.filter(
        (e) => e.OutputDevice === activity.OutputDevice
      )[0];

      let inputCommandName: string = `In ${input.InputNumber}`;
      let outputCommandName: string = `Out ${output.OutputLetter}`;

      let matrixDevice: HarmonyDevice =
        this._harmonyDataProvider.getDeviceByName(
          this._config.Matrix.DeviceName
        );

      //Route hdmi
      if (
        matrixDevice.supportsCommand(inputCommandName) &&
        matrixDevice.supportsCommand(outputCommandName)
      ) {
        await this._harmonyDataProvider.sendCommand(
          outputCommandName,
          matrixDevice
        );
        await this._harmonyDataProvider.sendCommand(
          inputCommandName,
          matrixDevice
        );
        await this._harmonyDataProvider.sendCommand(
          outputCommandName,
          matrixDevice
        );
        await this._harmonyDataProvider.sendCommand(
          inputCommandName,
          matrixDevice
        );
      }
    }
  }
}