package services

import (
	"context"
	"fmt"
	"tyapi-server/internal/domains/finance/entities"
	"tyapi-server/internal/domains/finance/repositories"
	"tyapi-server/internal/domains/finance/value_objects"

	"github.com/google/uuid"
)

// UserInvoiceInfoService 用户开票信息服务接口
type UserInvoiceInfoService interface {
	// GetUserInvoiceInfo 获取用户开票信息
	GetUserInvoiceInfo(ctx context.Context, userID string) (*entities.UserInvoiceInfo, error)
	
	// GetUserInvoiceInfoWithEnterpriseInfo 获取用户开票信息（包含企业认证信息）
	GetUserInvoiceInfoWithEnterpriseInfo(ctx context.Context, userID string, companyName, taxpayerID string) (*entities.UserInvoiceInfo, error)
	
	// CreateOrUpdateUserInvoiceInfo 创建或更新用户开票信息
	CreateOrUpdateUserInvoiceInfo(ctx context.Context, userID string, invoiceInfo *value_objects.InvoiceInfo) (*entities.UserInvoiceInfo, error)
	
	// CreateOrUpdateUserInvoiceInfoWithEnterpriseInfo 创建或更新用户开票信息（包含企业认证信息）
	CreateOrUpdateUserInvoiceInfoWithEnterpriseInfo(ctx context.Context, userID string, invoiceInfo *value_objects.InvoiceInfo, companyName, taxpayerID string) (*entities.UserInvoiceInfo, error)
	
	// ValidateInvoiceInfo 验证开票信息
	ValidateInvoiceInfo(ctx context.Context, invoiceInfo *value_objects.InvoiceInfo, invoiceType value_objects.InvoiceType) error
	
	// DeleteUserInvoiceInfo 删除用户开票信息
	DeleteUserInvoiceInfo(ctx context.Context, userID string) error
}

// UserInvoiceInfoServiceImpl 用户开票信息服务实现
type UserInvoiceInfoServiceImpl struct {
	userInvoiceInfoRepo repositories.UserInvoiceInfoRepository
}

// NewUserInvoiceInfoService 创建用户开票信息服务
func NewUserInvoiceInfoService(userInvoiceInfoRepo repositories.UserInvoiceInfoRepository) UserInvoiceInfoService {
	return &UserInvoiceInfoServiceImpl{
		userInvoiceInfoRepo: userInvoiceInfoRepo,
	}
}

// GetUserInvoiceInfo 获取用户开票信息
func (s *UserInvoiceInfoServiceImpl) GetUserInvoiceInfo(ctx context.Context, userID string) (*entities.UserInvoiceInfo, error) {
	info, err := s.userInvoiceInfoRepo.FindByUserID(ctx, userID)
	if err != nil {
		return nil, fmt.Errorf("获取用户开票信息失败: %w", err)
	}
	
	// 如果没有找到开票信息记录，创建新的实体
	if info == nil {
		info = &entities.UserInvoiceInfo{
			ID:             uuid.New().String(),
			UserID:         userID,
			CompanyName:    "",
			TaxpayerID:     "",
			BankName:       "",
			BankAccount:    "",
			CompanyAddress: "",
			CompanyPhone:   "",
			ReceivingEmail: "",
		}
	}
	
	return info, nil
}

// GetUserInvoiceInfoWithEnterpriseInfo 获取用户开票信息（包含企业认证信息）
func (s *UserInvoiceInfoServiceImpl) GetUserInvoiceInfoWithEnterpriseInfo(ctx context.Context, userID string, companyName, taxpayerID string) (*entities.UserInvoiceInfo, error) {
	info, err := s.userInvoiceInfoRepo.FindByUserID(ctx, userID)
	if err != nil {
		return nil, fmt.Errorf("获取用户开票信息失败: %w", err)
	}
	
	// 如果没有找到开票信息记录，创建新的实体
	if info == nil {
		info = &entities.UserInvoiceInfo{
			ID:             uuid.New().String(),
			UserID:         userID,
			CompanyName:    companyName, // 使用企业认证信息填充
			TaxpayerID:     taxpayerID,  // 使用企业认证信息填充
			BankName:       "",
			BankAccount:    "",
			CompanyAddress: "",
			CompanyPhone:   "",
			ReceivingEmail: "",
		}
	} else {
		// 如果已有记录，使用传入的企业认证信息覆盖公司名称和纳税人识别号
		if companyName != "" {
			info.CompanyName = companyName
		}
		if taxpayerID != "" {
			info.TaxpayerID = taxpayerID
		}
	}
	
	return info, nil
}

// CreateOrUpdateUserInvoiceInfo 创建或更新用户开票信息
func (s *UserInvoiceInfoServiceImpl) CreateOrUpdateUserInvoiceInfo(ctx context.Context, userID string, invoiceInfo *value_objects.InvoiceInfo) (*entities.UserInvoiceInfo, error) {
	// 验证开票信息
	if err := s.ValidateInvoiceInfo(ctx, invoiceInfo, value_objects.InvoiceTypeGeneral); err != nil {
		return nil, err
	}
	
	// 检查是否已存在
	exists, err := s.userInvoiceInfoRepo.Exists(ctx, userID)
	if err != nil {
		return nil, fmt.Errorf("检查用户开票信息失败: %w", err)
	}
	
	var userInvoiceInfo *entities.UserInvoiceInfo
	
	if exists {
		// 更新现有记录
		userInvoiceInfo, err = s.userInvoiceInfoRepo.FindByUserID(ctx, userID)
		if err != nil {
			return nil, fmt.Errorf("获取用户开票信息失败: %w", err)
		}
		
		// 更新字段
		userInvoiceInfo.CompanyName = invoiceInfo.CompanyName
		userInvoiceInfo.TaxpayerID = invoiceInfo.TaxpayerID
		userInvoiceInfo.BankName = invoiceInfo.BankName
		userInvoiceInfo.BankAccount = invoiceInfo.BankAccount
		userInvoiceInfo.CompanyAddress = invoiceInfo.CompanyAddress
		userInvoiceInfo.CompanyPhone = invoiceInfo.CompanyPhone
		userInvoiceInfo.ReceivingEmail = invoiceInfo.ReceivingEmail
		
		err = s.userInvoiceInfoRepo.Update(ctx, userInvoiceInfo)
	} else {
		// 创建新记录
		userInvoiceInfo = &entities.UserInvoiceInfo{
			ID:             uuid.New().String(),
			UserID:         userID,
			CompanyName:    invoiceInfo.CompanyName,
			TaxpayerID:     invoiceInfo.TaxpayerID,
			BankName:       invoiceInfo.BankName,
			BankAccount:    invoiceInfo.BankAccount,
			CompanyAddress: invoiceInfo.CompanyAddress,
			CompanyPhone:   invoiceInfo.CompanyPhone,
			ReceivingEmail: invoiceInfo.ReceivingEmail,
		}
		
		err = s.userInvoiceInfoRepo.Create(ctx, userInvoiceInfo)
	}
	
	if err != nil {
		return nil, fmt.Errorf("保存用户开票信息失败: %w", err)
	}
	
	return userInvoiceInfo, nil
}

// CreateOrUpdateUserInvoiceInfoWithEnterpriseInfo 创建或更新用户开票信息（包含企业认证信息）
func (s *UserInvoiceInfoServiceImpl) CreateOrUpdateUserInvoiceInfoWithEnterpriseInfo(ctx context.Context, userID string, invoiceInfo *value_objects.InvoiceInfo, companyName, taxpayerID string) (*entities.UserInvoiceInfo, error) {
	// 检查企业认证信息
	if companyName == "" || taxpayerID == "" {
		return nil, fmt.Errorf("用户未完成企业认证，无法创建开票信息")
	}
	
	// 创建新的开票信息对象，使用传入的企业认证信息
	updatedInvoiceInfo := &value_objects.InvoiceInfo{
		CompanyName:    companyName,      // 从企业认证信息获取
		TaxpayerID:     taxpayerID,       // 从企业认证信息获取
		BankName:       invoiceInfo.BankName,                 // 用户输入
		BankAccount:    invoiceInfo.BankAccount,              // 用户输入
		CompanyAddress: invoiceInfo.CompanyAddress,           // 用户输入
		CompanyPhone:   invoiceInfo.CompanyPhone,             // 用户输入
		ReceivingEmail: invoiceInfo.ReceivingEmail,           // 用户输入
	}
	
	// 验证开票信息
	if err := s.ValidateInvoiceInfo(ctx, updatedInvoiceInfo, value_objects.InvoiceTypeGeneral); err != nil {
		return nil, err
	}
	
	// 检查是否已存在
	exists, err := s.userInvoiceInfoRepo.Exists(ctx, userID)
	if err != nil {
		return nil, fmt.Errorf("检查用户开票信息失败: %w", err)
	}
	
	var userInvoiceInfo *entities.UserInvoiceInfo
	
	if exists {
		// 更新现有记录
		userInvoiceInfo, err = s.userInvoiceInfoRepo.FindByUserID(ctx, userID)
		if err != nil {
			return nil, fmt.Errorf("获取用户开票信息失败: %w", err)
		}
		
		// 更新字段（公司名称和纳税人识别号从企业认证信息获取，其他字段从用户输入获取）
		userInvoiceInfo.CompanyName = companyName
		userInvoiceInfo.TaxpayerID = taxpayerID
		userInvoiceInfo.BankName = invoiceInfo.BankName
		userInvoiceInfo.BankAccount = invoiceInfo.BankAccount
		userInvoiceInfo.CompanyAddress = invoiceInfo.CompanyAddress
		userInvoiceInfo.CompanyPhone = invoiceInfo.CompanyPhone
		userInvoiceInfo.ReceivingEmail = invoiceInfo.ReceivingEmail
		
		err = s.userInvoiceInfoRepo.Update(ctx, userInvoiceInfo)
	} else {
		// 创建新记录
		userInvoiceInfo = &entities.UserInvoiceInfo{
			ID:             uuid.New().String(),
			UserID:         userID,
			CompanyName:    companyName,      // 从企业认证信息获取
			TaxpayerID:     taxpayerID,       // 从企业认证信息获取
			BankName:       invoiceInfo.BankName,                 // 用户输入
			BankAccount:    invoiceInfo.BankAccount,              // 用户输入
			CompanyAddress: invoiceInfo.CompanyAddress,           // 用户输入
			CompanyPhone:   invoiceInfo.CompanyPhone,             // 用户输入
			ReceivingEmail: invoiceInfo.ReceivingEmail,           // 用户输入
		}
		
		err = s.userInvoiceInfoRepo.Create(ctx, userInvoiceInfo)
	}
	
	if err != nil {
		return nil, fmt.Errorf("保存用户开票信息失败: %w", err)
	}
	
	return userInvoiceInfo, nil
}

// ValidateInvoiceInfo 验证开票信息
func (s *UserInvoiceInfoServiceImpl) ValidateInvoiceInfo(ctx context.Context, invoiceInfo *value_objects.InvoiceInfo, invoiceType value_objects.InvoiceType) error {
	if invoiceType == value_objects.InvoiceTypeGeneral {
		return invoiceInfo.ValidateForGeneralInvoice()
	} else if invoiceType == value_objects.InvoiceTypeSpecial {
		return invoiceInfo.ValidateForSpecialInvoice()
	}
	
	return fmt.Errorf("无效的发票类型: %s", invoiceType)
}

// DeleteUserInvoiceInfo 删除用户开票信息
func (s *UserInvoiceInfoServiceImpl) DeleteUserInvoiceInfo(ctx context.Context, userID string) error {
	err := s.userInvoiceInfoRepo.Delete(ctx, userID)
	if err != nil {
		return fmt.Errorf("删除用户开票信息失败: %w", err)
	}
	return nil
}