/**
 * Example: User Repository Implementation
 *
 * This example demonstrates how to implement IUserRepository
 * using TypeORM as the underlying data access layer.
 *
 * @module @erp-suite/core/examples
 */

import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import {
  User,
  IUserRepository,
  ServiceContext,
  PaginatedResult,
  PaginationOptions,
  QueryOptions,
} from '@erp-suite/core';

/**
 * User repository implementation
 *
 * Implements IUserRepository interface with TypeORM
 *
 * @example
 * ```typescript
 * // In your module
 * @Module({
 *   imports: [TypeOrmModule.forFeature([User])],
 *   providers: [UserRepository],
 *   exports: [UserRepository],
 * })
 * export class UserModule {}
 *
 * // In your service
 * const factory = RepositoryFactory.getInstance();
 * const userRepo = factory.getRequired<IUserRepository>('UserRepository');
 * const user = await userRepo.findByEmail(ctx, 'user@example.com');
 * ```
 */
@Injectable()
export class UserRepository implements IUserRepository {
  constructor(
    @InjectRepository(User)
    private readonly ormRepo: Repository<User>,
  ) {}

  // ============================================================================
  // Core CRUD Operations (from IRepository<User>)
  // ============================================================================

  async findById(
    ctx: ServiceContext,
    id: string,
    options?: QueryOptions,
  ): Promise<User | null> {
    return this.ormRepo.findOne({
      where: { id, tenantId: ctx.tenantId },
      relations: options?.relations,
      select: options?.select as any,
    });
  }

  async findOne(
    ctx: ServiceContext,
    criteria: Partial<User>,
    options?: QueryOptions,
  ): Promise<User | null> {
    return this.ormRepo.findOne({
      where: { ...criteria, tenantId: ctx.tenantId },
      relations: options?.relations,
      select: options?.select as any,
    });
  }

  async findAll(
    ctx: ServiceContext,
    filters?: PaginationOptions & Partial<User>,
    options?: QueryOptions,
  ): Promise<PaginatedResult<User>> {
    const page = filters?.page || 1;
    const pageSize = filters?.pageSize || 20;

    // Extract pagination params
    const { page: _, pageSize: __, ...criteria } = filters || {};

    const [data, total] = await this.ormRepo.findAndCount({
      where: { ...criteria, tenantId: ctx.tenantId },
      relations: options?.relations,
      select: options?.select as any,
      skip: (page - 1) * pageSize,
      take: pageSize,
      order: { createdAt: 'DESC' },
    });

    return {
      data,
      meta: {
        page,
        pageSize,
        totalRecords: total,
        totalPages: Math.ceil(total / pageSize),
      },
    };
  }

  async findMany(
    ctx: ServiceContext,
    criteria: Partial<User>,
    options?: QueryOptions,
  ): Promise<User[]> {
    return this.ormRepo.find({
      where: { ...criteria, tenantId: ctx.tenantId },
      relations: options?.relations,
      select: options?.select as any,
    });
  }

  async create(ctx: ServiceContext, data: Partial<User>): Promise<User> {
    const user = this.ormRepo.create({
      ...data,
      tenantId: ctx.tenantId,
    });
    return this.ormRepo.save(user);
  }

  async createMany(ctx: ServiceContext, data: Partial<User>[]): Promise<User[]> {
    const users = data.map(item =>
      this.ormRepo.create({
        ...item,
        tenantId: ctx.tenantId,
      }),
    );
    return this.ormRepo.save(users);
  }

  async update(
    ctx: ServiceContext,
    id: string,
    data: Partial<User>,
  ): Promise<User | null> {
    await this.ormRepo.update(
      { id, tenantId: ctx.tenantId },
      data,
    );
    return this.findById(ctx, id);
  }

  async updateMany(
    ctx: ServiceContext,
    criteria: Partial<User>,
    data: Partial<User>,
  ): Promise<number> {
    const result = await this.ormRepo.update(
      { ...criteria, tenantId: ctx.tenantId },
      data,
    );
    return result.affected || 0;
  }

  async softDelete(ctx: ServiceContext, id: string): Promise<boolean> {
    const result = await this.ormRepo.softDelete({
      id,
      tenantId: ctx.tenantId,
    });
    return (result.affected || 0) > 0;
  }

  async hardDelete(ctx: ServiceContext, id: string): Promise<boolean> {
    const result = await this.ormRepo.delete({
      id,
      tenantId: ctx.tenantId,
    });
    return (result.affected || 0) > 0;
  }

  async deleteMany(ctx: ServiceContext, criteria: Partial<User>): Promise<number> {
    const result = await this.ormRepo.delete({
      ...criteria,
      tenantId: ctx.tenantId,
    });
    return result.affected || 0;
  }

  async count(
    ctx: ServiceContext,
    criteria?: Partial<User>,
    options?: QueryOptions,
  ): Promise<number> {
    return this.ormRepo.count({
      where: { ...criteria, tenantId: ctx.tenantId },
      relations: options?.relations,
    });
  }

  async exists(
    ctx: ServiceContext,
    id: string,
    options?: QueryOptions,
  ): Promise<boolean> {
    const count = await this.ormRepo.count({
      where: { id, tenantId: ctx.tenantId },
      relations: options?.relations,
    });
    return count > 0;
  }

  async query<R = unknown>(
    ctx: ServiceContext,
    sql: string,
    params: unknown[],
  ): Promise<R[]> {
    // Add tenant filtering to raw SQL
    const tenantParam = ctx.tenantId;
    return this.ormRepo.query(sql, [...params, tenantParam]);
  }

  async queryOne<R = unknown>(
    ctx: ServiceContext,
    sql: string,
    params: unknown[],
  ): Promise<R | null> {
    const results = await this.query<R>(ctx, sql, params);
    return results[0] || null;
  }

  // ============================================================================
  // User-Specific Operations (from IUserRepository)
  // ============================================================================

  async findByEmail(
    ctx: ServiceContext,
    email: string,
  ): Promise<User | null> {
    return this.ormRepo.findOne({
      where: {
        email,
        tenantId: ctx.tenantId,
      },
    });
  }

  async findByTenantId(
    ctx: ServiceContext,
    tenantId: string,
  ): Promise<User[]> {
    // Note: This bypasses ctx.tenantId for admin use cases
    return this.ormRepo.find({
      where: { tenantId },
      order: { createdAt: 'DESC' },
    });
  }

  async findActiveUsers(
    ctx: ServiceContext,
    filters?: PaginationOptions,
  ): Promise<PaginatedResult<User>> {
    const page = filters?.page || 1;
    const pageSize = filters?.pageSize || 20;

    const [data, total] = await this.ormRepo.findAndCount({
      where: {
        tenantId: ctx.tenantId,
        status: 'active',
      },
      skip: (page - 1) * pageSize,
      take: pageSize,
      order: { fullName: 'ASC' },
    });

    return {
      data,
      meta: {
        page,
        pageSize,
        totalRecords: total,
        totalPages: Math.ceil(total / pageSize),
      },
    };
  }

  async updateLastLogin(ctx: ServiceContext, userId: string): Promise<void> {
    await this.ormRepo.update(
      { id: userId, tenantId: ctx.tenantId },
      { lastLoginAt: new Date() },
    );
  }

  async updatePasswordHash(
    ctx: ServiceContext,
    userId: string,
    passwordHash: string,
  ): Promise<void> {
    await this.ormRepo.update(
      { id: userId, tenantId: ctx.tenantId },
      { passwordHash },
    );
  }

  // ============================================================================
  // Additional Helper Methods (Not in interface, but useful)
  // ============================================================================

  /**
   * Find users by status
   */
  async findByStatus(
    ctx: ServiceContext,
    status: 'active' | 'inactive' | 'suspended',
    filters?: PaginationOptions,
  ): Promise<PaginatedResult<User>> {
    const page = filters?.page || 1;
    const pageSize = filters?.pageSize || 20;

    const [data, total] = await this.ormRepo.findAndCount({
      where: {
        tenantId: ctx.tenantId,
        status,
      },
      skip: (page - 1) * pageSize,
      take: pageSize,
      order: { createdAt: 'DESC' },
    });

    return {
      data,
      meta: {
        page,
        pageSize,
        totalRecords: total,
        totalPages: Math.ceil(total / pageSize),
      },
    };
  }

  /**
   * Search users by name or email
   */
  async search(
    ctx: ServiceContext,
    query: string,
    filters?: PaginationOptions,
  ): Promise<PaginatedResult<User>> {
    const page = filters?.page || 1;
    const pageSize = filters?.pageSize || 20;

    const queryBuilder = this.ormRepo.createQueryBuilder('user');
    queryBuilder.where('user.tenantId = :tenantId', { tenantId: ctx.tenantId });
    queryBuilder.andWhere(
      '(user.fullName ILIKE :query OR user.email ILIKE :query)',
      { query: `%${query}%` },
    );
    queryBuilder.orderBy('user.fullName', 'ASC');
    queryBuilder.skip((page - 1) * pageSize);
    queryBuilder.take(pageSize);

    const [data, total] = await queryBuilder.getManyAndCount();

    return {
      data,
      meta: {
        page,
        pageSize,
        totalRecords: total,
        totalPages: Math.ceil(total / pageSize),
      },
    };
  }
}