import { BaseResponseDto } from '@app/common/dto/base.response.dto';
import { SuccessResponseDto } from '@app/common/dto/success.response.dto';
import { DeviceRepository } from '@app/common/modules/device/repositories';
import { HttpException, HttpStatus, Injectable } from '@nestjs/common';
import { DeviceSubSpaceParam, GetSubSpaceParam } from '../../dtos';
import { convertKeysToCamelCase } from '@app/common/helper/camelCaseConverter';
import { TuyaService } from '@app/common/integrations/tuya/services/tuya.service';
import { ProductRepository } from '@app/common/modules/product/repositories';
import { GetDeviceDetailsInterface } from '../../../device/interfaces/get.device.interface';
import { ValidationService } from '../space-validation.service';
import { SubspaceRepository } from '@app/common/modules/space/repositories/subspace.repository';
import { In, QueryRunner } from 'typeorm';
import { DeviceEntity } from '@app/common/modules/device/entities';
import { TagRepository } from '@app/common/modules/space';

@Injectable()
export class SubspaceDeviceService {
  constructor(
    private readonly subspaceRepository: SubspaceRepository,
    private readonly deviceRepository: DeviceRepository,
    private readonly tuyaService: TuyaService,
    private readonly productRepository: ProductRepository,
    private readonly validationService: ValidationService,
    private readonly tagRepository: TagRepository,
  ) {}

  async listDevicesInSubspace(
    params: GetSubSpaceParam,
  ): Promise<BaseResponseDto> {
    const { subSpaceUuid, spaceUuid, communityUuid, projectUuid } = params;

    await this.validationService.checkCommunityAndProjectSpaceExistence(
      communityUuid,
      projectUuid,
      spaceUuid,
    );

    const subspace = await this.findSubspaceWithDevices(subSpaceUuid);

    const safeFetch = async (device: any) => {
      try {
        const tuyaDetails = await this.getDeviceDetailsByDeviceIdTuya(
          device.deviceTuyaUuid,
        );

        return {
          uuid: device.uuid,
          deviceTuyaUuid: device.deviceTuyaUuid,
          productUuid: device.productDevice.uuid,
          productType: device.productDevice.prodType,
          isActive: device.isActive,
          createdAt: device.createdAt,
          updatedAt: device.updatedAt,
          ...tuyaDetails,
        };
      } catch (error) {
        return null;
      }
    };

    const detailedDevices = await Promise.all(subspace.devices.map(safeFetch));

    return new SuccessResponseDto({
      data: detailedDevices.filter(Boolean), // Remove nulls
      message: 'Successfully retrieved list of devices',
    });
  }

  async associateDeviceToSubspace(
    params: DeviceSubSpaceParam,
  ): Promise<BaseResponseDto> {
    const { subSpaceUuid, deviceUuid, spaceUuid, communityUuid, projectUuid } =
      params;
    try {
      await this.validationService.checkCommunityAndProjectSpaceExistence(
        communityUuid,
        projectUuid,
        spaceUuid,
      );

      const subspace = await this.findSubspace(subSpaceUuid);
      const device = await this.findDevice(deviceUuid);

      device.subspace = subspace;

      const newDevice = await this.deviceRepository.save(device);

      return new SuccessResponseDto({
        data: newDevice,
        message: `Successfully associated device to subspace`,
      });
    } catch (error) {
      if (error instanceof HttpException) {
        throw error;
      } else {
        throw new HttpException(
          `Failed to associate device to subspace with error = ${error}`,
          HttpStatus.INTERNAL_SERVER_ERROR,
        );
      }
    }
  }

  async disassociateDeviceFromSubspace(
    params: DeviceSubSpaceParam,
  ): Promise<BaseResponseDto> {
    const { subSpaceUuid, deviceUuid, spaceUuid, communityUuid, projectUuid } =
      params;
    try {
      await this.validationService.checkCommunityAndProjectSpaceExistence(
        communityUuid,
        projectUuid,
        spaceUuid,
      );
      const subspace = await this.findSubspace(subSpaceUuid);
      const device = await this.findDeviceWithSubspaceAndTag(deviceUuid);

      if (!device.subspace || device.subspace.uuid !== subspace.uuid) {
        throw new HttpException(
          `Device ${deviceUuid} is not associated with the specified subspace ${subSpaceUuid} `,
          HttpStatus.BAD_REQUEST,
        );
      }

      device.subspace = null;
      const updatedDevice = await this.deviceRepository.save(device);

      return new SuccessResponseDto({
        data: updatedDevice,
        message: 'Successfully dissociated device from subspace',
      });
    } catch (error) {
      if (error instanceof HttpException) {
        throw error;
      } else {
        throw new HttpException(
          `Failed to dissociate device from subspace error = ${error}`,
          HttpStatus.INTERNAL_SERVER_ERROR,
        );
      }
    }
  }

  // Helper method to find subspace with devices relation
  private async findSubspaceWithDevices(subSpaceUuid: string) {
    const subspace = await this.subspaceRepository.findOne({
      where: { uuid: subSpaceUuid },
      relations: ['devices', 'devices.productDevice'],
    });
    if (!subspace) {
      this.throwNotFound('Subspace', subSpaceUuid);
    }
    return subspace;
  }

  private async findSubspace(subSpaceUuid: string) {
    const subspace = await this.subspaceRepository.findOne({
      where: { uuid: subSpaceUuid },
    });
    if (!subspace) {
      this.throwNotFound('Subspace', subSpaceUuid);
    }
    return subspace;
  }

  private async findDevice(deviceUuid: string) {
    const device = await this.deviceRepository.findOne({
      where: { uuid: deviceUuid },
      relations: [
        'subspace',
        'tag',
        'tag.space',
        'tag.subspace',
        'spaceDevice',
      ],
    });
    if (!device) {
      this.throwNotFound('Device', deviceUuid);
    }
    return device;
  }

  async deleteSubspaceDevices(
    devices: DeviceEntity[],
    queryRunner: QueryRunner,
  ): Promise<void> {
    const deviceUuids = devices.map((device) => device.uuid);

    try {
      if (deviceUuids.length === 0) {
        return;
      }

      await queryRunner.manager.update(
        this.deviceRepository.target,
        { uuid: In(deviceUuids) },
        { subspace: null },
      );
    } catch (error) {
      throw new HttpException(
        `Failed to delete devices with IDs ${deviceUuids.join(', ')}: ${error.message}`,
        HttpStatus.INTERNAL_SERVER_ERROR,
      );
    }
  }

  private throwNotFound(entity: string, uuid: string) {
    throw new HttpException(
      `${entity} with ID ${uuid} not found`,
      HttpStatus.NOT_FOUND,
    );
  }

  private async getDeviceDetailsByDeviceIdTuya(
    deviceId: string,
  ): Promise<GetDeviceDetailsInterface> {
    try {
      const tuyaDeviceDetails =
        await this.tuyaService.getDeviceDetails(deviceId);

      const camelCaseResponse = convertKeysToCamelCase(tuyaDeviceDetails);

      const product = await this.productRepository.findOne({
        where: {
          prodId: camelCaseResponse.productId,
        },
      });

      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      const { uuid, ...rest } = camelCaseResponse;
      return {
        ...rest,
        productUuid: product?.uuid,
      } as GetDeviceDetailsInterface;
    } catch (error) {
      throw new HttpException(
        `Error fetching device details from Tuya for device uuid ${deviceId}.`,
        HttpStatus.INTERNAL_SERVER_ERROR,
      );
    }
  }

  async findNextTag(): Promise<number> {
    const tags = await this.tagRepository.find({ select: ['tag'] });

    const tagNumbers = tags
      .map((t) => t.tag.match(/^Tag (\d+)$/))
      .filter((match) => match)
      .map((match) => parseInt(match[1]))
      .sort((a, b) => a - b);

    const nextTagNumber = tagNumbers.length
      ? tagNumbers[tagNumbers.length - 1] + 1
      : 1;
    return nextTagNumber;
  }

  private async findDeviceWithSubspaceAndTag(deviceUuid: string) {
    return await this.deviceRepository.findOne({
      where: { uuid: deviceUuid },
      relations: ['subspace', 'tag', 'spaceDevice'],
      select: ['uuid', 'subspace', 'spaceDevice', 'productDevice', 'tag'],
    });
  }
}