package service

import (
	"crypto/md5"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"gorm.io/datatypes"
	"io"
	"net/http"
	"psi/database"
	"psi/models"
	systemReq "psi/models/request"
	systemRes "psi/models/response"
	"strconv"
	"strings"
	"time"
)

type BookService struct{}

// GetBookInfo 获取图书信息
func (s *BookService) GetBookInfo(req systemReq.BookRequest) (*systemRes.ESBook, error) {
	// 调用ES接口
	isbn := req.Isbn
	apiURL := fmt.Sprintf("https://book.center.yushutx.com/api/es/searchByISBNtoPsi?isbn=%s", isbn)
	resp, err := http.Get(apiURL)
	if err != nil {
		return nil, fmt.Errorf("[ERROR] 请求 ES 接口失败：%v\n", err)
	}

	body, err := io.ReadAll(resp.Body)
	resp.Body.Close()

	if err != nil {
		return nil, fmt.Errorf("[ERROR] 读取响应失败：%v\n", err)
	}

	var esResp systemRes.GetEsBookResponse
	if err := json.Unmarshal(body, &esResp); err != nil {
		return nil, fmt.Errorf("[ERROR] 解析响应失败：%v\n", err)
	}
	// 如果ES接口没有返回数据，返回空对象
	if esResp.Data.BookName.Value == "" && esResp.Data.ISBN == "" {
		return nil, nil
	}

	return &esResp.Data, nil
}

func (s *BookService) GetSuitBook(req systemReq.BookRequest) (*systemRes.SuitBookResponse, error) {
	var books []models.BookInfo
	if err := database.DB.Where("isbn = ? AND type IN (2, 3)", req.Isbn).Find(&books).Error; err != nil {
		return nil, fmt.Errorf("[ERROR] 查询书籍信息失败：%v\n", err)
	}

	if len(books) == 0 {
		return nil, nil
	}

	response := &systemRes.SuitBookResponse{
		WithFid:    make([]models.BookInfo, 0),
		WithoutFid: make([]models.BookInfo, 0),
	}

	for _, book := range books {
		if book.Fid == 0 {
			response.WithoutFid = append(response.WithoutFid, book)
		} else {
			response.WithFid = append(response.WithFid, book)
		}
	}

	return response, nil
}

func (s *BookService) GetProCode(req systemReq.GetCodeRequest) (string, error) {
	input := req.BookName + req.Author + req.Publisher
	hash := md5.Sum([]byte(input))
	hexStr := hex.EncodeToString(hash[:])
	code := hexStr[:20]
	return strings.ToUpper(code), nil
}

func (s *BookService) SyncBook(req systemReq.AddBookRequest) (int64, string, error) {
	if req.Fid == 0 {
		var existingBook models.BookInfo
		err := database.DB.Where("fid = 0 AND isbn = ?", req.Isbn).First(&existingBook).Error

		if err == nil {
			return existingBook.ID, fmt.Sprintf("%s-%s", req.Isbn, req.FIsbn), nil
		}
	}

	bookID, err := s.doBook(req)
	if err != nil {
		return 0, "", fmt.Errorf("[ERROR] 保存书籍信息失败：%v\n", err)
	}
	return bookID, fmt.Sprintf("%s-%s", req.Isbn, req.FIsbn), nil
}

// GetNoIsbnBook 获取无书号书籍
func (s *BookService) GetNoIsbnBook(req systemReq.GetNoIsbnBookRequest) (*systemRes.NoIsbnBookResponse, error) {
	query := database.DB.Model(&models.BookInfo{}).Where("type = ?", 4)

	if req.BookName != "" {
		query = query.Where("book_name LIKE ?", "%"+req.BookName+"%")
	}

	if req.Author != "" {
		query = query.Where("author LIKE ?", "%"+req.Author+"%")
	}

	if req.Publisher != "" {
		query = query.Where("publishing LIKE ?", "%"+req.Publisher+"%")
	}

	var total int64
	if err := query.Count(&total).Error; err != nil {
		return nil, fmt.Errorf("查询无书号书总数失败: %v", err)
	}

	var books []models.BookInfo
	if err := query.Order("id DESC").Find(&books).Error; err != nil {
		return nil, fmt.Errorf("查询无书号书列表失败: %v", err)
	}

	if books == nil {
		books = make([]models.BookInfo, 0)
	}

	return &systemRes.NoIsbnBookResponse{
		Total: total,
		List:  books,
	}, nil
}

func (s *BookService) doBook(data systemReq.AddBookRequest) (int64, error) {
	var liveImage datatypes.JSON
	if len(data.LiveImage) > 0 {
		jsonBytes, _ := json.Marshal(data.LiveImage)
		liveImage = jsonBytes
	} else {
		liveImage = datatypes.JSON("[]")
	}
	catIdByJson := datatypes.JSON(`{"xian_yu_cat_id": "", "kong_fu_zi_cat_id": "", "pin_duo_duo_cat_id": ""}`)
	if data.CatID != "" {
		var catObj map[string]string
		if err := json.Unmarshal([]byte(data.CatID), &catObj); err == nil {
			filtered := make(map[string]string)
			for k, v := range catObj {
				if strings.TrimSpace(v) != "" {
					filtered[k] = v
				}
			}
			if len(filtered) > 0 {
				filteredBytes, _ := json.Marshal(filtered)
				catIdByJson = filteredBytes
			}
		}
	}

	// publication_time 兼容秒级和毫秒级时间戳，格式化为 "年-月"
	var publicationDate string
	if data.PublicationTime > 0 {
		ts := data.PublicationTime
		if ts > 1e12 { // 毫秒级时间戳
			ts /= 1000
		}
		publicationDate = time.Unix(ts, 0).Format("2006-01")
	}

	book := models.BookInfo{
		Fid:             data.Fid,
		Type:            data.Type,
		ISBN:            data.Isbn,
		FISBN:           data.FIsbn,
		BookName:        data.BookName,
		FBookName:       data.FBookName,
		Author:          data.Author,
		Publishing:      data.Publisher,
		PublicationTime: data.PublicationTime,
		PublicationDate: publicationDate,
		Binding:         data.BindingLayout,
		PagesCount:      data.PageCount,
		WordsCount:      data.WordCount,
		Format:          data.BookFormat,
		Price:           data.FixPrice,
		CatID:           catIdByJson,
		LiveImage:       liveImage,
	}
	bookID, err := s.createBook(book)
	if err != nil {
		return 0, err
	}
	return bookID, nil
}

func (s *BookService) createBook(book models.BookInfo) (int64, error) {
	if err := database.DB.Create(&book).Error; err != nil {
		return 0, fmt.Errorf("创建书籍信息失败：%w", err)
	}
	return book.ID, nil
}

func (s *BookService) parseIntOrString(value string) int {
	value = strings.TrimSpace(value)
	if value == "" {
		return 0
	}

	intVal, err := strconv.Atoi(value)
	if err != nil {
		return 0
	}
	return intVal
}