import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Brackets, FindOptionsWhere, Repository } from 'typeorm';
import { Roles } from '~/auth/enums';
import { IJwtPayload } from '~/auth/interfaces';
import { CreateTaskRequestDto, TasksFilterOptions, TaskSubmissionRequestDto } from '../dtos/request';
import { Task } from '../entities';
import { TaskSubmission } from '../entities/task-submissions.entity';
import { SubmissionStatus, TaskStatus } from '../enums';
const ONE = 1;
@Injectable()
export class TaskRepository {
  constructor(@InjectRepository(Task) private readonly taskRepository: Repository<Task>) {}

  createTask(userId: string, body: CreateTaskRequestDto) {
    return this.taskRepository.save(
      this.taskRepository.create({
        title: body.title,
        description: body.description,
        rewardAmount: body.rewardAmount,
        taskFrequency: body.frequency,
        startDate: body.startDate,
        dueDate: body.dueDate,
        assignedById: userId,
        assignedToId: body.juniorId,
        imageId: body.imageId,
        isProofRequired: body.isProofRequired,
      }),
    );
  }

  findTask(where: FindOptionsWhere<Task>) {
    return this.taskRepository.findOne({
      where,
      relations: [
        'image',
        'assignedTo',
        'assignedTo.customer',
        'assignedTo.customer.user',
        'assignedTo.customer.user.profilePicture',
        'submission',
        'submission.proofOfCompletion',
      ],
    });
  }

  findTasks({ roles, sub: userId }: IJwtPayload, query: TasksFilterOptions) {
    const queryBuilder = this.taskRepository.createQueryBuilder('task');

    queryBuilder
      .leftJoinAndSelect('task.image', 'image')
      .leftJoinAndSelect('task.assignedTo', 'assignedTo')
      .leftJoinAndSelect('assignedTo.customer', 'customer')
      .leftJoinAndSelect('customer.user', 'user')
      .leftJoinAndSelect('user.profilePicture', 'profilePicture')
      .leftJoinAndSelect('task.submission', 'submission')
      .leftJoinAndSelect('submission.proofOfCompletion', 'proofOfCompletion');

    if (roles.includes(Roles.GUARDIAN)) {
      queryBuilder.where('task.assignedById = :userId', { userId });

      // Add a condition for juniorId if it exists
      if (query.juniorId) {
        queryBuilder.andWhere('task.assignedToId = :juniorId', { juniorId: query.juniorId });
      }
    } else {
      queryBuilder.where('task.assignedToId = :userId', { userId });
    }

    if (query.status === TaskStatus.PENDING) {
      queryBuilder.andWhere('task.dueDate >= :today', { today: new Date() });
      queryBuilder.andWhere('submission IS NULL');
    }

    if (query.status === TaskStatus.IN_PROGRESS) {
      queryBuilder.andWhere('submission IS NOT NULL');
      queryBuilder.andWhere('submission.status != :status', { status: SubmissionStatus.APPROVED });
      queryBuilder.andWhere('task.dueDate >= :today', { today: new Date() });
    }

    if (query.status === TaskStatus.COMPLETED) {
      queryBuilder.andWhere(
        new Brackets((qb) => {
          qb.where('task.dueDate < :today', { today: new Date() }).orWhere('submission.status = :status', {
            status: SubmissionStatus.APPROVED,
          });
        }),
      );
    }

    queryBuilder.orderBy('task.createdAt', 'DESC');
    queryBuilder.skip((query.page - ONE) * query.size);
    queryBuilder.take(query.size);

    return queryBuilder.getManyAndCount();
  }

  createSubmission(task: Task, body: TaskSubmissionRequestDto) {
    const submission = task.submission || new TaskSubmission();
    submission.status = task.isProofRequired ? SubmissionStatus.PENDING : SubmissionStatus.APPROVED;
    submission.submittedAt = new Date();
    submission.taskId = task.id;
    submission.proofOfCompletionId = body.imageId;

    task.submission = submission;
    return task.save();
  }

  approveSubmission(submission: TaskSubmission) {
    submission.status = SubmissionStatus.APPROVED;
    return submission.save();
  }

  rejectSubmission(submission: TaskSubmission) {
    submission.status = SubmissionStatus.REJECTED;
    return submission.save();
  }
}