import { GetBuildingChildDto } from '../dtos/get.building.dto';
import { SpaceTypeRepository } from '../../../libs/common/src/modules/space/repositories/space.repository';
import {
  Injectable,
  HttpException,
  HttpStatus,
  BadRequestException,
} from '@nestjs/common';
import { SpaceRepository } from '@app/common/modules/space/repositories';
import { AddBuildingDto, AddUserBuildingDto } from '../dtos';
import {
  BuildingChildInterface,
  BuildingParentInterface,
  GetBuildingByUserUuidInterface,
  GetBuildingByUuidInterface,
  RenameBuildingByUuidInterface,
} from '../interface/building.interface';
import { SpaceEntity } from '@app/common/modules/space/entities';
import { UpdateBuildingNameDto } from '../dtos/update.building.dto';
import { UserSpaceRepository } from '@app/common/modules/user/repositories';

@Injectable()
export class BuildingService {
  constructor(
    private readonly spaceRepository: SpaceRepository,
    private readonly spaceTypeRepository: SpaceTypeRepository,
    private readonly userSpaceRepository: UserSpaceRepository,
  ) {}

  async addBuilding(addBuildingDto: AddBuildingDto) {
    try {
      const spaceType = await this.spaceTypeRepository.findOne({
        where: {
          type: 'building',
        },
      });

      if (!spaceType) {
        throw new BadRequestException('Invalid building UUID');
      }
      const building = await this.spaceRepository.save({
        spaceName: addBuildingDto.buildingName,
        parent: { uuid: addBuildingDto.communityUuid },
        spaceType: { uuid: spaceType.uuid },
      });
      return building;
    } catch (err) {
      if (err instanceof BadRequestException) {
        throw err; // Re-throw BadRequestException
      } else {
        throw new HttpException('Building not found', HttpStatus.NOT_FOUND);
      }
    }
  }

  async getBuildingByUuid(
    buildingUuid: string,
  ): Promise<GetBuildingByUuidInterface> {
    try {
      const building = await this.spaceRepository.findOne({
        where: {
          uuid: buildingUuid,
          spaceType: {
            type: 'building',
          },
        },
        relations: ['spaceType'],
      });
      if (
        !building ||
        !building.spaceType ||
        building.spaceType.type !== 'building'
      ) {
        throw new BadRequestException('Invalid building UUID');
      }
      return {
        uuid: building.uuid,
        createdAt: building.createdAt,
        updatedAt: building.updatedAt,
        name: building.spaceName,
        type: building.spaceType.type,
      };
    } catch (err) {
      if (err instanceof BadRequestException) {
        throw err; // Re-throw BadRequestException
      } else {
        throw new HttpException('Building not found', HttpStatus.NOT_FOUND);
      }
    }
  }
  async getBuildingChildByUuid(
    buildingUuid: string,
    getBuildingChildDto: GetBuildingChildDto,
  ): Promise<BuildingChildInterface> {
    try {
      const { includeSubSpaces, page, pageSize } = getBuildingChildDto;

      const space = await this.spaceRepository.findOneOrFail({
        where: { uuid: buildingUuid },
        relations: ['children', 'spaceType'],
      });
      if (!space || !space.spaceType || space.spaceType.type !== 'building') {
        throw new BadRequestException('Invalid building UUID');
      }

      const totalCount = await this.spaceRepository.count({
        where: { parent: { uuid: space.uuid } },
      });

      const children = await this.buildHierarchy(
        space,
        includeSubSpaces,
        page,
        pageSize,
      );

      return {
        uuid: space.uuid,
        name: space.spaceName,
        type: space.spaceType.type,
        totalCount,
        children,
      };
    } catch (err) {
      if (err instanceof BadRequestException) {
        throw err; // Re-throw BadRequestException
      } else {
        throw new HttpException('Building not found', HttpStatus.NOT_FOUND);
      }
    }
  }

  private async buildHierarchy(
    space: SpaceEntity,
    includeSubSpaces: boolean,
    page: number,
    pageSize: number,
  ): Promise<BuildingChildInterface[]> {
    const children = await this.spaceRepository.find({
      where: { parent: { uuid: space.uuid } },
      relations: ['spaceType'],
      skip: (page - 1) * pageSize,
      take: pageSize,
    });

    if (!children || children.length === 0 || !includeSubSpaces) {
      return children
        .filter(
          (child) =>
            child.spaceType.type !== 'building' &&
            child.spaceType.type !== 'community',
        ) // Filter remaining building and community types
        .map((child) => ({
          uuid: child.uuid,
          name: child.spaceName,
          type: child.spaceType.type,
        }));
    }

    const childHierarchies = await Promise.all(
      children
        .filter(
          (child) =>
            child.spaceType.type !== 'building' &&
            child.spaceType.type !== 'community',
        ) // Filter remaining building and community types
        .map(async (child) => ({
          uuid: child.uuid,
          name: child.spaceName,
          type: child.spaceType.type,
          children: await this.buildHierarchy(child, true, 1, pageSize),
        })),
    );

    return childHierarchies;
  }

  async getBuildingParentByUuid(
    buildingUuid: string,
  ): Promise<BuildingParentInterface> {
    try {
      const building = await this.spaceRepository.findOne({
        where: {
          uuid: buildingUuid,
          spaceType: {
            type: 'building',
          },
        },
        relations: ['spaceType', 'parent', 'parent.spaceType'],
      });
      if (
        !building ||
        !building.spaceType ||
        building.spaceType.type !== 'building'
      ) {
        throw new BadRequestException('Invalid building UUID');
      }
      return {
        uuid: building.uuid,
        name: building.spaceName,
        type: building.spaceType.type,
        parent: {
          uuid: building.parent.uuid,
          name: building.parent.spaceName,
          type: building.parent.spaceType.type,
        },
      };
    } catch (err) {
      if (err instanceof BadRequestException) {
        throw err; // Re-throw BadRequestException
      } else {
        throw new HttpException('Building not found', HttpStatus.NOT_FOUND);
      }
    }
  }

  async getBuildingsByUserId(
    userUuid: string,
  ): Promise<GetBuildingByUserUuidInterface[]> {
    try {
      const buildings = await this.userSpaceRepository.find({
        relations: ['space', 'space.spaceType'],
        where: {
          user: { uuid: userUuid },
          space: { spaceType: { type: 'building' } },
        },
      });

      if (buildings.length === 0) {
        throw new HttpException(
          'this user has no buildings',
          HttpStatus.NOT_FOUND,
        );
      }
      const spaces = buildings.map((building) => ({
        uuid: building.space.uuid,
        name: building.space.spaceName,
        type: building.space.spaceType.type,
      }));

      return spaces;
    } catch (err) {
      if (err instanceof HttpException) {
        throw err;
      } else {
        throw new HttpException('user not found', HttpStatus.NOT_FOUND);
      }
    }
  }
  async addUserBuilding(addUserBuildingDto: AddUserBuildingDto) {
    try {
      await this.userSpaceRepository.save({
        user: { uuid: addUserBuildingDto.userUuid },
        space: { uuid: addUserBuildingDto.buildingUuid },
      });
    } catch (err) {
      if (err.code === '23505') {
        throw new HttpException(
          'User already belongs to this building',
          HttpStatus.BAD_REQUEST,
        );
      }
      throw new HttpException(
        err.message || 'Internal Server Error',
        HttpStatus.INTERNAL_SERVER_ERROR,
      );
    }
  }
  async renameBuildingByUuid(
    buildingUuid: string,
    updateBuildingNameDto: UpdateBuildingNameDto,
  ): Promise<RenameBuildingByUuidInterface> {
    try {
      const building = await this.spaceRepository.findOneOrFail({
        where: { uuid: buildingUuid },
        relations: ['spaceType'],
      });

      if (
        !building ||
        !building.spaceType ||
        building.spaceType.type !== 'building'
      ) {
        throw new BadRequestException('Invalid building UUID');
      }

      await this.spaceRepository.update(
        { uuid: buildingUuid },
        { spaceName: updateBuildingNameDto.buildingName },
      );

      // Fetch the updated building
      const updatedBuilding = await this.spaceRepository.findOneOrFail({
        where: { uuid: buildingUuid },
        relations: ['spaceType'],
      });

      return {
        uuid: updatedBuilding.uuid,
        name: updatedBuilding.spaceName,
        type: updatedBuilding.spaceType.type,
      };
    } catch (err) {
      if (err instanceof BadRequestException) {
        throw err; // Re-throw BadRequestException
      } else {
        throw new HttpException('Building not found', HttpStatus.NOT_FOUND);
      }
    }
  }
}