import { Controller, Get, Param, Logger, Inject, NotFoundException } from '@nestjs/common';
import { ApiTags, ApiOperation, ApiParam, ApiResponse } from '@nestjs/swagger';
import {
  REFERRAL_RELATIONSHIP_REPOSITORY,
  IReferralRelationshipRepository,
  TEAM_STATISTICS_REPOSITORY,
  ITeamStatisticsRepository,
} from '../../domain';

/**
 * 内部推荐链API - 供其他微服务调用
 * 无需JWT认证（服务间内部通信）
 */
@ApiTags('Internal Referral Chain API')
@Controller('internal/referral-chain')
export class InternalReferralChainController {
  private readonly logger = new Logger(InternalReferralChainController.name);

  constructor(
    @Inject(REFERRAL_RELATIONSHIP_REPOSITORY)
    private readonly referralRepo: IReferralRelationshipRepository,
    @Inject(TEAM_STATISTICS_REPOSITORY)
    private readonly teamStatsRepo: ITeamStatisticsRepository,
  ) {}

  /**
   * 获取用户的祖先链（从直接推荐人到根节点）
   */
  @Get(':accountSequence')
  @ApiOperation({ summary: '获取用户推荐链（内部API）' })
  @ApiParam({ name: 'accountSequence', description: '账户序列号' })
  @ApiResponse({
    status: 200,
    description: '推荐链数据',
    schema: {
      type: 'object',
      properties: {
        accountSequence: { type: 'string', description: '格式: D + YYMMDD + 5位序号' },
        userId: { type: 'string' },
        ancestorPath: {
          type: 'array',
          items: { type: 'string' },
          description: '祖先链（从直接推荐人到根节点的accountSequence列表）',
        },
        referrerId: { type: 'string', nullable: true },
      },
    },
  })
  async getReferralChain(@Param('accountSequence') accountSequence: string) {
    this.logger.debug(`[INTERNAL] getReferralChain: accountSequence=${accountSequence}`);

    const relationship = await this.referralRepo.findByAccountSequence(accountSequence);

    if (!relationship) {
      this.logger.debug(`[INTERNAL] No referral found for accountSequence: ${accountSequence}`);
      // 返回空的祖先链而不是抛出错误
      return {
        accountSequence: accountSequence,
        userId: null,
        ancestorPath: [],
        referrerId: null,
      };
    }

    // referralChain 存储的是 userId (bigint)，需要转换为 accountSequence
    // 因为 authorization-service 使用 accountSequence 来查询授权记录
    const ancestorUserIds = relationship.referralChain;
    const ancestorPath: string[] = [];

    for (const ancestorUserId of ancestorUserIds) {
      const ancestorRelationship = await this.referralRepo.findByUserId(ancestorUserId);
      if (ancestorRelationship) {
        ancestorPath.push(ancestorRelationship.accountSequence);
      } else {
        this.logger.warn(`[INTERNAL] Ancestor userId ${ancestorUserId} not found`);
      }
    }

    this.logger.debug(`[INTERNAL] getReferralChain result: ${ancestorPath.length} ancestors`);

    return {
      accountSequence: relationship.accountSequence,
      userId: relationship.userId.toString(),
      ancestorPath,
      referrerId: relationship.referrerId?.toString() ?? null,
    };
  }

  /**
   * 批量获取用户的祖先链
   */
  @Get('batch/:accountSequences')
  @ApiOperation({ summary: '批量获取用户推荐链（内部API）' })
  @ApiParam({ name: 'accountSequences', description: '账户序列号列表，逗号分隔' })
  @ApiResponse({
    status: 200,
    description: '批量推荐链数据',
  })
  async getBatchReferralChains(@Param('accountSequences') accountSequences: string) {
    const sequences = accountSequences.split(',').map((s) => s.trim());
    this.logger.debug(`[INTERNAL] getBatchReferralChains: ${sequences.length} accounts`);

    const results: Record<string, { userId: string | null; ancestorPath: string[]; referrerId: string | null }> = {};

    for (const seq of sequences) {
      const relationship = await this.referralRepo.findByAccountSequence(seq);
      if (relationship) {
        // 转换 userId 为 accountSequence
        const ancestorPath: string[] = [];
        for (const ancestorUserId of relationship.referralChain) {
          const ancestorRelationship = await this.referralRepo.findByUserId(ancestorUserId);
          if (ancestorRelationship) {
            ancestorPath.push(ancestorRelationship.accountSequence);
          }
        }

        results[seq] = {
          userId: relationship.userId.toString(),
          ancestorPath,
          referrerId: relationship.referrerId?.toString() ?? null,
        };
      } else {
        results[seq] = {
          userId: null,
          ancestorPath: [],
          referrerId: null,
        };
      }
    }

    return results;
  }

  /**
   * 获取用户的团队成员（下级用户）的accountSequence列表
   * 用于查找下级社区
   */
  @Get(':accountSequence/team-members')
  @ApiOperation({ summary: '获取团队成员accountSequence列表（内部API）' })
  @ApiParam({ name: 'accountSequence', description: '账户序列号' })
  @ApiResponse({
    status: 200,
    description: '团队成员列表',
    schema: {
      type: 'object',
      properties: {
        accountSequence: { type: 'string', description: '格式: D + YYMMDD + 5位序号' },
        teamMembers: {
          type: 'array',
          items: { type: 'string' },
          description: '团队成员accountSequence列表（直接和间接下级）',
        },
      },
    },
  })
  async getTeamMembers(@Param('accountSequence') accountSequence: string) {
    this.logger.debug(`[INTERNAL] getTeamMembers: accountSequence=${accountSequence}`);

    const relationship = await this.referralRepo.findByAccountSequence(accountSequence);

    if (!relationship) {
      return {
        accountSequence: accountSequence,
        teamMembers: [],
      };
    }

    // 获取所有直推用户
    const directReferrals = await this.referralRepo.findDirectReferrals(relationship.userId);

    // 递归获取所有下级成员的accountSequence
    const teamMembers: string[] = [];
    const queue = [...directReferrals];

    while (queue.length > 0) {
      const current = queue.shift()!;
      teamMembers.push(current.accountSequence);

      // 获取当前用户的直推
      const subReferrals = await this.referralRepo.findDirectReferrals(current.userId);
      queue.push(...subReferrals);
    }

    return {
      accountSequence: accountSequence,
      teamMembers,
    };
  }

  /**
   * 获取用户的完整团队统计（内部API）
   * 用于用户详情页展示
   */
  @Get(':accountSequence/profile-stats')
  @ApiOperation({ summary: '获取用户团队统计（内部API）' })
  @ApiParam({ name: 'accountSequence', description: '账户序列号' })
  @ApiResponse({
    status: 200,
    description: '用户团队统计',
    schema: {
      type: 'object',
      properties: {
        accountSequence: { type: 'string' },
        directReferralCount: { type: 'number', description: '直推人数' },
        umbrellaUserCount: { type: 'number', description: '伞下用户数（团队总人数）' },
        personalPlantingCount: { type: 'number', description: '个人认种数量' },
        teamPlantingCount: { type: 'number', description: '团队认种数量' },
      },
    },
  })
  async getProfileStats(@Param('accountSequence') accountSequence: string) {
    this.logger.debug(`[INTERNAL] getProfileStats: accountSequence=${accountSequence}`);

    const relationship = await this.referralRepo.findByAccountSequence(accountSequence);

    if (!relationship) {
      return {
        accountSequence: accountSequence,
        directReferralCount: 0,
        umbrellaUserCount: 0,
        personalPlantingCount: 0,
        teamPlantingCount: 0,
      };
    }

    // 获取直推人数
    const directReferrals = await this.referralRepo.findDirectReferrals(relationship.userId);
    const directReferralCount = directReferrals.length;

    // 获取伞下用户数（递归获取所有下级）
    let umbrellaUserCount = 0;
    const queue = [...directReferrals];
    while (queue.length > 0) {
      umbrellaUserCount++;
      const current = queue.shift()!;
      const subReferrals = await this.referralRepo.findDirectReferrals(current.userId);
      queue.push(...subReferrals);
    }

    // 获取团队统计
    const teamStats = await this.teamStatsRepo.findByUserId(relationship.userId);
    const personalPlantingCount = teamStats?.personalPlantingCount ?? 0;
    const teamPlantingCount = teamStats?.teamPlantingCount ?? 0;

    return {
      accountSequence: accountSequence,
      directReferralCount,
      umbrellaUserCount,
      personalPlantingCount,
      teamPlantingCount,
    };
  }
}