// Package personal_customer 提供个人客户管理的业务逻辑服务
// 包含个人客户注册、登录、微信绑定、短信验证等功能
package personal_customer

import (
	"context"

	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/internal/model/dto"
	"github.com/break/junhong_cmp_fiber/internal/service/verification"
	"github.com/break/junhong_cmp_fiber/internal/store/postgres"
	"github.com/break/junhong_cmp_fiber/pkg/auth"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
	"github.com/break/junhong_cmp_fiber/pkg/wechat"
	"go.uber.org/zap"
	"gorm.io/gorm"
)

// Service 个人客户服务
type Service struct {
	store                 *postgres.PersonalCustomerStore
	phoneStore            *postgres.PersonalCustomerPhoneStore
	verificationService   *verification.Service
	jwtManager            *auth.JWTManager
	wechatOfficialAccount wechat.OfficialAccountServiceInterface
	logger                *zap.Logger
}

// NewService 创建个人客户服务实例
func NewService(
	store *postgres.PersonalCustomerStore,
	phoneStore *postgres.PersonalCustomerPhoneStore,
	verificationService *verification.Service,
	jwtManager *auth.JWTManager,
	wechatOfficialAccount wechat.OfficialAccountServiceInterface,
	logger *zap.Logger,
) *Service {
	return &Service{
		store:                 store,
		phoneStore:            phoneStore,
		verificationService:   verificationService,
		jwtManager:            jwtManager,
		wechatOfficialAccount: wechatOfficialAccount,
		logger:                logger,
	}
}

// SendVerificationCode 发送验证码
func (s *Service) SendVerificationCode(ctx context.Context, phone string) error {
	return s.verificationService.SendCode(ctx, phone)
}

// VerifyCode 验证验证码
func (s *Service) VerifyCode(ctx context.Context, phone string, code string) error {
	return s.verificationService.VerifyCode(ctx, phone, code)
}

// LoginByPhone 通过手机号登录
// 如果手机号不存在，自动创建新的个人客户
// 注意：此方法是临时实现，完整的登录流程应该是先微信授权，再绑定手机号
func (s *Service) LoginByPhone(ctx context.Context, phone string, code string) (string, *model.PersonalCustomer, error) {
	// 验证验证码
	if err := s.verificationService.VerifyCode(ctx, phone, code); err != nil {
		s.logger.Warn("验证码验证失败",
			zap.String("phone", phone),
			zap.Error(err),
		)
		return "", nil, err
	}

	// 查找或创建个人客户
	customer, err := s.store.GetByPhone(ctx, phone)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			// 客户不存在，创建新客户
			// 注意：临时实现，使用空的微信信息（正式应该先微信授权）
			customer = &model.PersonalCustomer{
				WxOpenID:  "", // 临时为空，后续需绑定微信
				WxUnionID: "", // 临时为空，后续需绑定微信
				Status:    1,  // 默认启用
			}
			if err := s.store.Create(ctx, customer); err != nil {
				s.logger.Error("创建个人客户失败",
					zap.String("phone", phone),
					zap.Error(err),
				)
				return "", nil, errors.Wrap(errors.CodeInternalError, err, "创建个人客户失败")
			}

			// 创建手机号绑定记录
			// TODO: 这里需要通过 PersonalCustomerPhoneStore 来创建
			// 暂时跳过，等待 PersonalCustomerPhoneStore 实现

			s.logger.Info("创建新个人客户",
				zap.Uint("customer_id", customer.ID),
				zap.String("phone", phone),
			)
		} else {
			s.logger.Error("查询个人客户失败",
				zap.String("phone", phone),
				zap.Error(err),
			)
			return "", nil, errors.Wrap(errors.CodeInternalError, err, "查询个人客户失败")
		}
	}

	// 检查客户状态
	if customer.Status == 0 {
		s.logger.Warn("个人客户已被禁用",
			zap.Uint("customer_id", customer.ID),
			zap.String("phone", phone),
		)
		return "", nil, errors.New(errors.CodeForbidden, "账号已被禁用")
	}

	// 生成 Token（临时传递 phone，后续应该从 Token 中移除 phone 字段）
	token, err := s.jwtManager.GeneratePersonalCustomerToken(customer.ID, phone)
	if err != nil {
		s.logger.Error("生成 Token 失败",
			zap.Uint("customer_id", customer.ID),
			zap.String("phone", phone),
			zap.Error(err),
		)
		return "", nil, errors.Wrap(errors.CodeInternalError, err, "生成 Token 失败")
	}

	s.logger.Info("个人客户登录成功",
		zap.Uint("customer_id", customer.ID),
		zap.String("phone", phone),
	)

	return token, customer, nil
}

// BindWechat 绑定微信信息
func (s *Service) BindWechat(ctx context.Context, customerID uint, wxOpenID, wxUnionID string) error {
	// 获取客户
	customer, err := s.store.GetByID(ctx, customerID)
	if err != nil {
		s.logger.Error("查询个人客户失败",
			zap.Uint("customer_id", customerID),
			zap.Error(err),
		)
		return errors.Wrap(errors.CodeInternalError, err, "查询个人客户失败")
	}

	// 更新微信信息
	customer.WxOpenID = wxOpenID
	customer.WxUnionID = wxUnionID

	if err := s.store.Update(ctx, customer); err != nil {
		s.logger.Error("更新微信信息失败",
			zap.Uint("customer_id", customerID),
			zap.Error(err),
		)
		return errors.Wrap(errors.CodeInternalError, err, "更新微信信息失败")
	}

	s.logger.Info("绑定微信信息成功",
		zap.Uint("customer_id", customerID),
		zap.String("wx_open_id", wxOpenID),
	)

	return nil
}

// UpdateProfile 更新个人资料
func (s *Service) UpdateProfile(ctx context.Context, customerID uint, nickname, avatarURL string) error {
	customer, err := s.store.GetByID(ctx, customerID)
	if err != nil {
		s.logger.Error("查询个人客户失败",
			zap.Uint("customer_id", customerID),
			zap.Error(err),
		)
		return errors.Wrap(errors.CodeInternalError, err, "查询个人客户失败")
	}

	// 更新资料
	if nickname != "" {
		customer.Nickname = nickname
	}
	if avatarURL != "" {
		customer.AvatarURL = avatarURL
	}

	if err := s.store.Update(ctx, customer); err != nil {
		s.logger.Error("更新个人资料失败",
			zap.Uint("customer_id", customerID),
			zap.Error(err),
		)
		return errors.Wrap(errors.CodeInternalError, err, "更新个人资料失败")
	}

	s.logger.Info("更新个人资料成功",
		zap.Uint("customer_id", customerID),
	)

	return nil
}

// GetProfile 获取个人资料
func (s *Service) GetProfile(ctx context.Context, customerID uint) (*model.PersonalCustomer, error) {
	customer, err := s.store.GetByID(ctx, customerID)
	if err != nil {
		s.logger.Error("查询个人客户失败",
			zap.Uint("customer_id", customerID),
			zap.Error(err),
		)
		return nil, errors.Wrap(errors.CodeInternalError, err, "查询个人客户失败")
	}

	return customer, nil
}

// GetProfileWithPhone 获取个人资料（包含主手机号）
func (s *Service) GetProfileWithPhone(ctx context.Context, customerID uint) (*model.PersonalCustomer, string, error) {
	// 获取客户信息
	customer, err := s.store.GetByID(ctx, customerID)
	if err != nil {
		s.logger.Error("查询个人客户失败",
			zap.Uint("customer_id", customerID),
			zap.Error(err),
		)
		return nil, "", errors.Wrap(errors.CodeInternalError, err, "查询个人客户失败")
	}

	// 获取主手机号
	phone := ""
	primaryPhone, err := s.phoneStore.GetPrimaryPhone(ctx, customerID)
	if err != nil {
		if err != gorm.ErrRecordNotFound {
			s.logger.Error("查询主手机号失败",
				zap.Uint("customer_id", customerID),
				zap.Error(err),
			)
			// 不返回错误，继续返回客户信息（手机号为空）
		}
	} else {
		phone = primaryPhone.Phone
	}

	return customer, phone, nil
}

// WechatOAuthLogin 微信 OAuth 登录
// 通过微信授权码登录，如果用户不存在则自动创建
func (s *Service) WechatOAuthLogin(ctx context.Context, code string) (*dto.WechatOAuthResponse, error) {
	// 检查微信服务是否已配置
	if s.wechatOfficialAccount == nil {
		s.logger.Error("微信公众号服务未配置")
		return nil, errors.New(errors.CodeWechatOAuthFailed, "微信服务未配置")
	}

	// 通过授权码获取用户详细信息
	userInfo, err := s.wechatOfficialAccount.GetUserInfoDetailed(ctx, code)
	if err != nil {
		s.logger.Error("获取微信用户信息失败",
			zap.String("code", code),
			zap.Error(err),
		)
		return nil, err
	}

	// 通过 OpenID 查找现有客户
	customer, err := s.store.GetByWxOpenID(ctx, userInfo.OpenID)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			// 客户不存在，创建新客户
			customer = &model.PersonalCustomer{
				WxOpenID:  userInfo.OpenID,
				WxUnionID: userInfo.UnionID,
				Nickname:  userInfo.Nickname,
				AvatarURL: userInfo.Avatar,
				Status:    1, // 默认启用
			}
			if err := s.store.Create(ctx, customer); err != nil {
				s.logger.Error("创建微信用户失败",
					zap.String("open_id", userInfo.OpenID),
					zap.Error(err),
				)
				return nil, errors.Wrap(errors.CodeInternalError, err, "创建用户失败")
			}
			s.logger.Info("通过微信创建新用户",
				zap.Uint("customer_id", customer.ID),
				zap.String("open_id", userInfo.OpenID),
			)
		} else {
			s.logger.Error("查询微信用户失败",
				zap.String("open_id", userInfo.OpenID),
				zap.Error(err),
			)
			return nil, errors.Wrap(errors.CodeInternalError, err, "查询用户失败")
		}
	} else {
		// 客户已存在，更新昵称和头像（如果有变化）
		needUpdate := false
		if userInfo.Nickname != "" && customer.Nickname != userInfo.Nickname {
			customer.Nickname = userInfo.Nickname
			needUpdate = true
		}
		if userInfo.Avatar != "" && customer.AvatarURL != userInfo.Avatar {
			customer.AvatarURL = userInfo.Avatar
			needUpdate = true
		}
		if needUpdate {
			if err := s.store.Update(ctx, customer); err != nil {
				s.logger.Warn("更新微信用户信息失败",
					zap.Uint("customer_id", customer.ID),
					zap.Error(err),
				)
				// 不阻断登录流程
			}
		}
	}

	// 检查客户状态
	if customer.Status == 0 {
		s.logger.Warn("微信用户已被禁用",
			zap.Uint("customer_id", customer.ID),
			zap.String("open_id", userInfo.OpenID),
		)
		return nil, errors.New(errors.CodeForbidden, "账号已被禁用")
	}

	// 生成 JWT Token
	token, err := s.jwtManager.GeneratePersonalCustomerToken(customer.ID, "")
	if err != nil {
		s.logger.Error("生成 Token 失败",
			zap.Uint("customer_id", customer.ID),
			zap.Error(err),
		)
		return nil, errors.Wrap(errors.CodeInternalError, err, "生成 Token 失败")
	}

	// 获取主手机号（如果有）
	phone := ""
	primaryPhone, err := s.phoneStore.GetPrimaryPhone(ctx, customer.ID)
	if err == nil {
		phone = primaryPhone.Phone
	}

	s.logger.Info("微信 OAuth 登录成功",
		zap.Uint("customer_id", customer.ID),
		zap.String("open_id", userInfo.OpenID),
	)

	return &dto.WechatOAuthResponse{
		AccessToken: token,
		ExpiresIn:   24 * 60 * 60, // 24 小时
		Customer: &dto.PersonalCustomerResponse{
			ID:        customer.ID,
			Phone:     phone,
			Nickname:  customer.Nickname,
			AvatarURL: customer.AvatarURL,
			WxOpenID:  customer.WxOpenID,
			WxUnionID: customer.WxUnionID,
			Status:    customer.Status,
			CreatedAt: customer.CreatedAt.Format("2006-01-02 15:04:05"),
			UpdatedAt: customer.UpdatedAt.Format("2006-01-02 15:04:05"),
		},
	}, nil
}

// BindWechatWithCode 通过微信授权码绑定微信
// customerID: 当前登录的客户 ID
// code: 微信授权码
func (s *Service) BindWechatWithCode(ctx context.Context, customerID uint, code string) error {
	// 检查微信服务是否已配置
	if s.wechatOfficialAccount == nil {
		s.logger.Error("微信公众号服务未配置")
		return errors.New(errors.CodeWechatOAuthFailed, "微信服务未配置")
	}

	// 获取客户信息
	customer, err := s.store.GetByID(ctx, customerID)
	if err != nil {
		s.logger.Error("查询个人客户失败",
			zap.Uint("customer_id", customerID),
			zap.Error(err),
		)
		return errors.Wrap(errors.CodeInternalError, err, "查询客户失败")
	}

	// 获取微信用户信息
	userInfo, err := s.wechatOfficialAccount.GetUserInfoDetailed(ctx, code)
	if err != nil {
		s.logger.Error("获取微信用户信息失败",
			zap.Uint("customer_id", customerID),
			zap.String("code", code),
			zap.Error(err),
		)
		return err
	}

	// 检查该 OpenID 是否已被其他用户绑定
	existingCustomer, err := s.store.GetByWxOpenID(ctx, userInfo.OpenID)
	if err == nil && existingCustomer.ID != customerID {
		s.logger.Warn("微信账号已被其他用户绑定",
			zap.Uint("customer_id", customerID),
			zap.Uint("existing_customer_id", existingCustomer.ID),
			zap.String("open_id", userInfo.OpenID),
		)
		return errors.New(errors.CodeConflict, "该微信账号已被其他用户绑定")
	}

	// 更新微信信息
	customer.WxOpenID = userInfo.OpenID
	customer.WxUnionID = userInfo.UnionID
	if userInfo.Nickname != "" {
		customer.Nickname = userInfo.Nickname
	}
	if userInfo.Avatar != "" {
		customer.AvatarURL = userInfo.Avatar
	}

	if err := s.store.Update(ctx, customer); err != nil {
		s.logger.Error("绑定微信信息失败",
			zap.Uint("customer_id", customerID),
			zap.Error(err),
		)
		return errors.Wrap(errors.CodeInternalError, err, "绑定微信失败")
	}

	s.logger.Info("绑定微信成功",
		zap.Uint("customer_id", customerID),
		zap.String("open_id", userInfo.OpenID),
	)

	return nil
}