package app

import (
	"errors"
	"github.com/go-chi/chi/v5"
	"gorm.io/gorm"
	"net/http"
	"strconv"
	"strings"
)

func userInfoFromRequest(r *Request) (*User, error) {
	var user User

	if name, ok := r.Get("name"); ok && len(name) > 0 {
		user.Name = name
	} else {
		return nil, NewError(1, "缺少用户名称")
	}

	if phoneNumber, ok := r.Get("phone_number"); ok && len(phoneNumber) > 0 {
		if len(phoneNumber) != 11 {
			return nil, NewError(2, "手机号码格式错误")
		}
		user.PhoneNumber = phoneNumber
	} else {
		return nil, NewError(2, "缺少手机号码")
	}

	if password, ok := r.Get("password"); ok && len(password) > 0  {
		if len(password) < 6 {
			return nil, NewError(2, "密码太短")
		}
		user.Password = password
	} else {
		return nil, NewError(2, "缺少密码")
	}

	return &user, nil
}

// CreateUser 创建用户
func CreateUser(w *ResponseWriter, r *Request) {
	user, err := userInfoFromRequest(r)
	if err != nil {
		w.Error(err)
		return
	}

	var count int64
	if err = DB.Model(&User{}).Where("phone_number = ?", user.PhoneNumber).Count(&count).Error; err != nil {
		w.Error(err)
		return
	}
	if count > 0 {
		w.Error(NewError(2, "手机号码已经被使用了"))
		return
	}

	if err = DB.Create(&user).Error; err != nil {
		w.Error(err)
	} else {
		w.Ok(user, "创建用户成功")
	}
}

// UpdateUser 更新用户
func UpdateUser(w *ResponseWriter, r *Request) {
	id := chi.URLParam(r.Request, "id")
	if len(id) == 0 {
		w.Error(NewError(1, "缺少用户ID"))
	}
	user, err := userInfoFromRequest(r)
	if err != nil {
		w.Error(err)
		return
	}

}

// DeleteUser 删除用户
func DeleteUser(w *ResponseWriter, r *Request) {

}

// ListUser 用户列表
func ListUser(w *ResponseWriter, r *Request) {

}

// Login 用户登录
func Login(w *ResponseWriter, r *Request) {

}

// CreateGoods 创建商品
func CreateGoods(w *ResponseWriter, r *Request) {
	name := r.Value("name")
	price := r.Float32("price", 0)
	if len(name) == 0 {
		w.Fail(http.StatusBadRequest, 1, "商品名称错误")
		return
	}
	if price <= 0 {
		w.Fail(http.StatusBadRequest, 2, "商品价格错误")
		return
	}
	var goods Goods
	err := DB.First(&goods, "name = ?", name).Error
	if errors.Is(err, gorm.ErrRecordNotFound) {
		goods = Goods{
			Name:  name,
			Price: price,
		}
		err = DB.Create(&goods).Error
		if err != nil {
			w.Fail(http.StatusBadRequest, 3, "创建商品失败")
		} else {
			w.Ok(goods)
		}
	} else if err != nil {
		LogError(err)
		w.Fail(http.StatusBadRequest, 4, "商品价格错误")
	} else {
		w.Fail(http.StatusBadRequest, 5, "商品已经存在")
	}
}

// UpdateGoods 更新产品信息
func UpdateGoods(w *ResponseWriter, r *Request) {
	name := r.Value("name")
	price := r.Float32("price", 0)
	id := uint(r.Uint64("id", 0))
	if len(name) == 0 {
		w.Fail(http.StatusBadRequest, 1, "商品名称错误")
		return
	}
	if price <= 0 {
		w.Fail(http.StatusBadRequest, 2, "商品价格错误")
		return
	}
	var goods Goods
	err := DB.First(&goods, "id = ?", id).Error
	if errors.Is(err, gorm.ErrRecordNotFound) {
		w.Fail(http.StatusBadRequest, 2, "商品不存在")
	} else if err != nil {
		LogError(err)
		w.Fail(http.StatusBadRequest, 3, err.Error())
	} else {
		// 商品名称不能重复
		err = DB.Where("id <> ?", id).First(&Goods{}, "name = ?", name).Error
		if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
			LogError(err)
			w.Fail(http.StatusBadRequest, 4, err.Error())
			return
		}
		if goods.Name != name || goods.Price != price {
			goods.Name = name
			goods.Price = price
			err = DB.Save(&goods).Error
			if err != nil {
				LogError(err)
				w.Fail(http.StatusBadRequest, 5, err.Error())
				return
			}
		}
		w.Ok(goods, "修改成功")
	}
}

// GetGoodsList 查询商品列表
func GetGoodsList(w *ResponseWriter, r *Request) {
	search := func(db *gorm.DB) *gorm.DB {
		return db.
			Model(&Goods{}).
			Scopes(TimeRange(r, "created_at")).
			Scopes(Paginate(r)).
			Scopes(Search(r, "name", "name LIKE ?"))
	}
	var goodsList []Goods
	var total int64
	var err error
	if err = DB.Scopes(search).Count(&total).Error; err == nil {
		err = DB.Scopes(search).Find(&goodsList).Error
	}
	if err != nil {
		w.Fail(http.StatusInternalServerError, 1, err.Error())
	} else {
		w.Ok(map[string]any{
			"list":  goodsList,
			"total": total,
		})
	}
}

func GetGoodsPrices(w *ResponseWriter, r *Request) {
	id := uint(r.Uint64("id", 0))
	var goods Goods
	if err := DB.Scopes(func(db *gorm.DB) *gorm.DB {
		var queries []string
		var args []any
		if val, ok := r.Get("start_time"); ok {
			queries = append(queries, "created_at >= ?")
			args = append(args, val)
		}
		if val, ok := r.Get("end_time"); ok {
			queries = append(queries, "created_at <= ?")
			args = append(args, val)
		}
		if len(queries) == 0 {
			return db.Preload("Prices")
		}
		args = append([]any{strings.Join(queries, " AND ")}, args...)
		return db.Preload("Prices", args...)
	}).First(&goods, "id = ?", id).Error; err != nil {
		w.Fail(http.StatusInternalServerError, 1, err.Error())
	} else {
		w.Ok(goods)
	}
}