package bus_service

import (
	"context"
	"errors"
	"fmt"
	log "github.com/go-admin-team/go-admin-core/logger"
	"github.com/go-admin-team/go-admin-core/sdk/service"
	"go-admin/app/admin/models"
	"go-admin/app/admin/models/bus_models"
	"go-admin/common/global"
	"gorm.io/gorm"
	"math/rand"
	"time"
)

type CooperativeService struct {
	service.Service
}

// GetCooperativeList 获取合作商列表
func (e *CooperativeService) GetCooperativeList(ctx context.Context, req bus_models.CooperativeListReq) (
	bus_models.CooperativeListResp, error) {
	var cooperativeList []bus_models.BusCooperative
	var resp bus_models.CooperativeListResp
	page := req.Page - 1
	if page < 0 {
		page = 0
	}
	if req.PageSize == 0 {
		req.PageSize = 10
	}

	// 构建查询条件
	db := e.Orm.WithContext(ctx)
	if req.CooperativeNumber != "" {
		db = db.Where("cooperative_number = ?", req.CooperativeNumber)
	}
	if req.CooperativeName != "" {
		db = db.Where("cooperative_name LIKE ?", "%"+req.CooperativeName+"%")
	}
	if req.Status != 0 {
		db = db.Where("status = ?", req.Status)
	}

	// 查询合作商基本信息
	if err := db.Offset(page * req.PageSize).Limit(req.PageSize).Find(&cooperativeList).Error; err != nil {
		return resp, errors.New("查询合作商列表失败")
	}

	// 获取所有合作商ID
	var cooperativeIDs []uint64
	for _, c := range cooperativeList {
		cooperativeIDs = append(cooperativeIDs, c.ID)
	}

	// 查询所有关联的产品信息
	var cooperativeProducts []bus_models.BusCooperativeProduct
	if len(cooperativeIDs) > 0 {
		err := e.Orm.WithContext(ctx).
			Where("cooperative_id IN (?)", cooperativeIDs).
			Find(&cooperativeProducts).Error
		if err != nil {
			return resp, errors.New("查询合作商产品信息失败")
		}
	}

	// 获取所有产品ID
	var productIDs []uint64
	for _, cp := range cooperativeProducts {
		productIDs = append(productIDs, cp.ProductID)
	}

	// 查询产品详细信息
	var products []bus_models.BusProduct
	if len(productIDs) > 0 {
		err := e.Orm.WithContext(ctx).
			Where("id IN (?)", productIDs).
			Find(&products).Error
		if err != nil {
			return resp, errors.New("查询产品信息失败")
		}
	}

	// 构建合作商ID到产品信息的映射
	productMap := make(map[uint64][]bus_models.ProductDetail)
	for _, cp := range cooperativeProducts {
		for _, p := range products {
			if p.ID == cp.ProductID {
				productMap[cp.CooperativeID] = append(productMap[cp.CooperativeID], bus_models.ProductDetail{
					ProductCode: p.ProductCode,
					ProductName: p.ProductName,
					Discount:    cp.Discount,
					ProductID:   p.ID,
				})
				break
			}
		}
	}

	// 组装返回数据
	for i := range cooperativeList {
		cooperativeList[i].Products = productMap[cooperativeList[i].ID]
	}

	resp.List = cooperativeList
	resp.Total = len(cooperativeList)
	resp.Page = page + 1
	resp.PageSize = req.PageSize

	return resp, nil
}

// CreateCooperative 新建合作商（使用事务）
func (e *CooperativeService) CreateCooperative(req bus_models.CreateCooperativeReq) (bus_models.CreateCooperativeResp, error) {
	var resp bus_models.CreateCooperativeResp

	// 开启事务
	tx := e.Orm.Begin()
	defer func() {
		if r := recover(); r != nil {
			// 打印 panic 错误信息
			log.Error("Panic recovered: %v", r)
			tx.Rollback()
		}
	}()

	// 1-新建系统用户
	// 查询 role_id
	var roleID int
	err := tx.Model(&models.SysRole{}).
		Select("role_id").
		Where("role_name = ?", global.CooperativeRoleName).
		Where("status = ?", global.SysRoleStatusOnUse). // 确保角色状态为正常
		First(&roleID).Error

	if err != nil || roleID == 0 {
		tx.Rollback()
		return resp, errors.New("系统未创建合作商角色")
	}

	// **调用创建用户接口**
	var userPhone string
	if req.Tel == "" {
		userPhone = "13966668888"
	} else {
		userPhone = req.Tel
	}

	var sysUser models.SysUser
	var count int64

	// 检查用户名是否已存在
	err = tx.Model(&sysUser).Where("username = ?", req.Account).Count(&count).Error
	if err != nil {
		tx.Rollback() // 出现错误时回滚
		return resp, errors.New("数据库错误：" + err.Error())
	}

	if count > 0 {
		tx.Rollback() // 用户名已存在，回滚事务
		return resp, errors.New("用户名已存在")
	}

	// 创建SysUser对象并插入
	userReq := models.SysUser{
		Username: req.Account,               // 使用合作商账户作为用户名
		Password: req.Password,              // 直接使用合作商密码（前端已加密）
		NickName: req.CooperativeName,       // 用合作商名称作为昵称
		Phone:    userPhone,                 // 绑定手机号
		Email:    userPhone + "@mail.com",   // 默认邮箱
		DeptId:   global.DefaultDeptId,      // 默认部门ID
		Status:   global.SysUserStatusOnUse, // 默认状态
		RoleId:   roleID,                    // 默认角色ID
	}

	err = tx.Create(&userReq).Error
	if err != nil {
		tx.Rollback() // 创建用户失败，回滚事务
		return resp, errors.New("创建用户失败：" + err.Error())
	}

	// 2-创建合作商
	cooperative := bus_models.BusCooperative{
		CooperativeName: req.CooperativeName,
		Contact:         req.Contact,
		Tel:             req.Tel,
		Status:          global.CooperativeStatusOnUse,
		Account:         req.Account,
		Password:        req.Password,
		Balance:         req.Balance,
		Free:            req.Free,
		Bond:            req.Bond,
		CardHolder:      req.CardHolder,
		Bank:            req.Bank,
		CardID:          req.CardID,
		TaxID:           req.TaxID,
		UserId:          userReq.UserId,
	}
	cooperative.CooperativeNumber, err = GenerateCooperativeNumber(e.Orm)
	if err != nil {
		return resp, err
	}

	if err := tx.Create(&cooperative).Error; err != nil {
		tx.Rollback()
		return resp, errors.New("创建合作商失败")
	}

	// 插入合作商产品信息
	var cooperativeProducts []bus_models.BusCooperativeProduct
	for _, product := range req.Products {
		cooperativeProducts = append(cooperativeProducts, bus_models.BusCooperativeProduct{
			CooperativeID: cooperative.ID,
			ProductID:     product.ProductID,
			Discount:      product.Discount,
		})
	}
	if len(cooperativeProducts) > 0 {
		if err := tx.Create(&cooperativeProducts).Error; err != nil {
			tx.Rollback()
			return resp, errors.New("创建合作商产品失败")
		}
	}

	// 提交事务
	if err := tx.Commit().Error; err != nil {
		return resp, errors.New("提交事务失败")
	}

	resp.CooperativeNumber = cooperative.CooperativeNumber
	return resp, nil
}

func (e *CooperativeService) EditCooperative(req bus_models.EditCooperativeReq) error {
	// 开启事务
	tx := e.Orm.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()

	// 查找合作商
	var cooperative bus_models.BusCooperative
	if err := tx.Where("cooperative_number = ?", req.CooperativeNumber).First(&cooperative).Error; err != nil {
		tx.Rollback()
		return errors.New("合作商不存在")
	}

	// 更新合作商信息
	updateData := map[string]interface{}{
		"cooperative_name": req.CooperativeName,
		"contact":          req.Contact,
		"tel":              req.Tel,
		"status":           req.Status,
		"account":          req.Account,
		"balance":          req.Balance,
		"free":             req.Free,
		"bond":             req.Bond,
		"card_holder":      req.CardHolder,
		"bank":             req.Bank,
		"card_id":          req.CardID,
		"tax_id":           req.TaxID,
	}

	if req.Password != "" {
		updateData["password"] = req.Password
	}

	if err := tx.Model(&bus_models.BusCooperative{}).Where("cooperative_number = ?", req.CooperativeNumber).
		Updates(updateData).Error; err != nil {
		tx.Rollback()
		return errors.New("更新合作商信息失败")
	}

	// 获取数据库中的旧产品数据
	var existingProducts []bus_models.BusCooperativeProduct
	tx.Where("cooperative_id = ?", cooperative.ID).Find(&existingProducts)

	// 旧数据转换为 map (ProductID => Discount)
	existingMap := make(map[uint64]float64)
	for _, p := range existingProducts {
		existingMap[p.ProductID] = p.Discount
	}

	// 计算需要更新、删除、插入的数据
	newProductMap := make(map[uint64]float64) // (ProductID => Discount)
	var newProducts []bus_models.BusCooperativeProduct
	for _, product := range req.Products {
		newProductMap[product.ProductID] = product.Discount

		// 如果是新产品，或者折扣变化，则需要插入/更新
		if discount, exists := existingMap[product.ProductID]; !exists || discount != product.Discount {
			newProducts = append(newProducts, bus_models.BusCooperativeProduct{
				CooperativeID: cooperative.ID,
				ProductID:     product.ProductID,
				Discount:      product.Discount,
			})
		}
	}

	// 删除不存在于新数据中的旧产品
	var productIDsToDelete []uint64
	for oldProductID := range existingMap {
		if _, exists := newProductMap[oldProductID]; !exists {
			productIDsToDelete = append(productIDsToDelete, oldProductID)
		}
	}
	if len(productIDsToDelete) > 0 {
		tx.Where("cooperative_id = ? AND product_id IN ?", cooperative.ID, productIDsToDelete).Delete(&bus_models.BusCooperativeProduct{})
	}

	// 插入新的或有折扣变化的产品
	if len(newProducts) > 0 {
		if err := tx.Create(&newProducts).Error; err != nil {
			tx.Rollback()
			return errors.New("添加/更新合作商产品信息失败")
		}
	}

	// 提交事务
	if err := tx.Commit().Error; err != nil {
		return errors.New("提交事务失败")
	}

	return nil
}

// DeleteCooperative 删除合作商
func (e *CooperativeService) DeleteCooperative(req bus_models.DeleteCooperativeReq) error {
	// 开始事务
	tx := e.Orm.Begin()

	// 1. 查询合作商的user_id
	var cooperative bus_models.BusCooperative
	err := tx.Where("cooperative_number = ?", req.CooperativeNumber).First(&cooperative).Error
	if err != nil {
		tx.Rollback() // 如果查询失败，回滚事务
		return errors.New("查询合作商失败：" + err.Error())
	}

	// 2. 如果user_id != 0，删除sys_user中的用户
	if cooperative.UserId != 0 {
		var sysUser models.SysUser
		err = tx.Where("user_id = ?", cooperative.UserId).Delete(&sysUser).Error
		if err != nil {
			tx.Rollback() // 删除用户失败，回滚事务
			return errors.New("删除用户失败：" + err.Error())
		}
	}

	// 3. 删除合作商
	err = tx.Where("cooperative_number = ?", req.CooperativeNumber).Delete(&bus_models.BusCooperative{}).Error
	if err != nil {
		tx.Rollback() // 删除合作商失败，回滚事务
		return errors.New("删除合作商失败：" + err.Error())
	}

	// 4. 提交事务
	err = tx.Commit().Error
	if err != nil {
		tx.Rollback() // 提交事务失败，回滚
		return errors.New("提交事务失败：" + err.Error())
	}

	return nil
}

// GetCooperativeDetail 获取合作商详细信息，包括产品信息
func (e *CooperativeService) GetCooperativeDetail(ctx context.Context, req bus_models.CooperativeDetailReq) (
	bus_models.CooperativeDetailResp, error) {
	var resp bus_models.CooperativeDetailResp
	var cooperative bus_models.BusCooperative

	// 查询合作商基本信息
	db := e.Orm.WithContext(ctx).Where("cooperative_number = ?", req.CooperativeNumber)

	if err := db.First(&cooperative).Error; err != nil {
		return resp, errors.New("查询合作商详情失败")
	}

	// 查询该合作商的产品信息
	var cooperativeProducts []bus_models.BusCooperativeProduct
	err := e.Orm.WithContext(ctx).
		Where("cooperative_id = ?", cooperative.ID).
		Find(&cooperativeProducts).Error

	if err != nil {
		return resp, errors.New("查询合作商产品信息失败")
	}

	// 根据产品ID查询产品名称和编码
	var productIDs []uint64
	for _, cp := range cooperativeProducts {
		productIDs = append(productIDs, cp.ProductID)
	}

	// 查询产品详细信息
	var products []bus_models.BusProduct
	if len(productIDs) > 0 {
		err = e.Orm.WithContext(ctx).
			Where("id IN (?)", productIDs).
			Find(&products).Error

		if err != nil {
			return resp, errors.New("查询产品信息失败")
		}
	}

	// 将产品信息填充到响应中
	var productDetails []bus_models.ProductDetail
	for _, cp := range cooperativeProducts {
		// 查找对应产品
		for _, p := range products {
			if p.ID == cp.ProductID { // 确保ID匹配
				productDetails = append(productDetails, bus_models.ProductDetail{
					ProductCode: p.ProductCode,
					ProductName: p.ProductName,
					Discount:    cp.Discount,
				})
				break
			}
		}
	}

	// 填充合作商信息
	resp.CooperativeNumber = cooperative.CooperativeNumber
	resp.CooperativeName = cooperative.CooperativeName
	resp.Contact = cooperative.Contact
	resp.Tel = cooperative.Tel
	resp.Status = cooperative.Status
	resp.Account = cooperative.Account
	resp.Balance = cooperative.Balance
	resp.Free = cooperative.Free
	resp.Bond = cooperative.Bond
	resp.CardHolder = cooperative.CardHolder
	resp.Bank = cooperative.Bank
	resp.CardID = cooperative.CardID
	resp.TaxID = cooperative.TaxID

	resp.Products = productDetails

	return resp, nil
}

// GenerateCooperativeNumber 生成唯一的合作商编号，日期 + 10位随机数
func GenerateCooperativeNumber(db *gorm.DB) (string, error) {
	// 获取当前日期（年月日）
	dateStr := time.Now().Format("20060102") // 格式为：YYYYMMDD

	// 生成一个10位随机数
	rand.Seed(time.Now().UnixNano())      // 设置随机数种子
	randomNum := rand.Int63n(10000000000) // 生成一个0到9999999999之间的随机数

	// 将随机数转为固定长度的字符串，确保10位
	randomNumStr := fmt.Sprintf("%010d", randomNum) // 确保为10位，不足补零

	// 拼接日期和随机数
	cooperativeNumber := fmt.Sprintf("%s%s", dateStr, randomNumStr)

	// 检查生成的合作商编号是否已存在
	var count int64
	err := db.Model(&bus_models.BusCooperative{}).Where("cooperative_number = ?", cooperativeNumber).Count(&count).Error
	if err != nil {
		return "", err
	}

	// 如果已存在，重新生成
	if count > 0 {
		return GenerateCooperativeNumber(db) // 递归重新生成
	}

	return cooperativeNumber, nil
}

// AdjustAccount 账户调整（加款/减款）
func (e *CooperativeService) AdjustAccount(ctx context.Context, req bus_models.AdjustAccountReq) error {
	var cooperative bus_models.BusCooperative
	db := e.Orm.WithContext(ctx)

	// 查询合作商账户信息
	if err := db.Where("cooperative_number = ?", req.CooperativeNumber).First(&cooperative).Error; err != nil {
		return errors.New("合作商账户不存在")
	}

	if req.Amount == 0 && req.GiftAmount == 0 {
		return nil
	}

	// 确保 transaction_type = 2 (减款) 时，金额是负的
	if req.TransactionType == 2 {
		if req.Amount > 0 {
			req.Amount = -req.Amount
		}
		if req.GiftAmount > 0 {
			req.GiftAmount = -req.GiftAmount
		}
	}

	// 加款时需要 SourceFundingType，但减款时不需要
	if req.TransactionType == 1 && req.SourceFundingType == 0 {
		return errors.New("加款时必须填写资金来源")
	}

	// 计算新的余额
	newBalance := cooperative.Balance
	newFree := cooperative.Free

	if req.TransactionType == 2 { // 处理减款
		newBalance += req.Amount
		newFree += req.GiftAmount

		if cooperative.Balance < -req.Amount {
			log.Info("账户余额不足，无法扣除普通余额")
			newBalance = 0
		}
		if cooperative.Free < -req.GiftAmount {
			log.Info("赠送余额不足，无法扣除赠送余额")
			newFree = 0
		}

	} else { // 处理加款
		newBalance += req.Amount
		newFree += req.GiftAmount
	}

	// 开启事务，确保数据一致性
	tx := db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()

	// 更新合作商账户余额
	if err := tx.Model(&cooperative).Updates(map[string]interface{}{
		"balance": newBalance,
		"free":    newFree,
	}).Error; err != nil {
		tx.Rollback()
		return errors.New("更新账户余额失败")
	}

	// 记录交易信息
	transaction := bus_models.BusCooperativeTransaction{
		CooperativeID:     cooperative.ID,
		Amount:            req.Amount,
		GiftAmount:        req.GiftAmount,
		SourceFundingType: req.SourceFundingType,
		Remark:            req.Remark,
	}

	if err := tx.Create(&transaction).Error; err != nil {
		tx.Rollback()
		return errors.New("记录交易失败")
	}

	tx.Commit()
	return nil
}

// SetCooperativeStatus 在服务层更新合作商状态
func (e *CooperativeService) SetCooperativeStatus(req bus_models.SetCooperativeStatusReq) error {
	return e.Orm.Model(&bus_models.BusCooperative{}).
		Where("cooperative_number = ?", req.CooperativeNumber).
		Update("status", req.Status).Error
}

// QueryCooperativeProducts 查询合作商产品列表
func (e *CooperativeService) QueryCooperativeProducts(req bus_models.QueryCooperativeProductsReq) (*bus_models.QueryCooperativeProductsResp, error) {
	var cooperative bus_models.BusCooperative
	page := req.Page - 1
	if page < 0 {
		page = 0
	}
	if req.PageSize == 0 {
		req.PageSize = 10
	}

	err := e.Orm.Where("cooperative_number = ?", req.CooperativeNumber).First(&cooperative).Error
	if err != nil {
		return nil, errors.New("合作商不存在")
	}

	var products []bus_models.ProductInfo
	var total int64

	query := e.Orm.Table("bus_cooperative_product as cp").
		Joins("JOIN bus_product as p ON cp.product_id = p.id").
		Where("cp.cooperative_id = ?", cooperative.ID)

	// 获取总数
	query.Count(&total)

	// 查询分页数据
	query.Select("p.id as product_id,p.product_code, p.product_name, p.product_type, p.type, p.size, p.price, cp.discount, " +
		"p.retail_price, p.description, p.province, p.city, p.platform").
		Offset(page * req.PageSize).
		Limit(req.PageSize).
		Find(&products)

	return &bus_models.QueryCooperativeProductsResp{
		Total:    int(total),
		Page:     page + 1,
		PageSize: req.PageSize,
		List:     products,
	}, nil
}

// UpdateCooperativeProductDiscount 批量更新合作商产品折扣
func (e *CooperativeService) UpdateCooperativeProductDiscount(req bus_models.UpdateProductDiscountReq) error {
	if len(req.Products) == 0 {
		return errors.New("产品列表不能为空")
	}

	var cooperative bus_models.BusCooperative
	err := e.Orm.Where("cooperative_number = ?", req.CooperativeNumber).First(&cooperative).Error
	if err != nil {
		return errors.New("合作商不存在")
	}

	tx := e.Orm.Begin() // 开始事务
	for _, p := range req.Products {
		if p.Discount < 0 || p.Discount > 1 {
			tx.Rollback()
			return fmt.Errorf("产品ID %d 的折扣值不合法，必须在 0-1 之间", p.ProductID)
		}

		err := tx.Model(&bus_models.BusCooperativeProduct{}).
			Where("cooperative_id = ? AND product_id = ?", cooperative.ID, p.ProductID).
			Update("discount", p.Discount).Error

		if err != nil {
			tx.Rollback()
			return fmt.Errorf("更新产品ID %d 失败: %v", p.ProductID, err)
		}
	}

	if err := tx.Commit().Error; err != nil {
		tx.Rollback()
		return fmt.Errorf("提交事务失败: %v", err)
	}

	return nil
}