package handler

import (
	"fmt"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/rovina/zsp-backend/internal/model"
	"github.com/rovina/zsp-backend/internal/service"
)

func (h *ContractHandler) List(c *gin.Context) {
	contractType := c.Query("contractType")
	list, err := h.service.List(contractType)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "data": list})
}

func (h *ContractHandler) Get(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "invalid id"})
		return
	}
	contract, err := h.service.GetByID(uint(id))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"success": false, "message": "contract not found"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "data": contract})
}

func (h *ContractHandler) Update(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "invalid id"})
		return
	}
	existing, err := h.service.GetByID(uint(id))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"success": false, "message": "contract not found"})
		return
	}
	var body struct {
		Name         string  `json:"name"`
		ContractType string  `json:"contractType"`
		ContractCode string  `json:"contractCode"`
		BuyParty     string  `json:"buyParty"`
		SellParty    string  `json:"sellParty"`
		Commodity    string  `json:"commodity"`
		Count        float64 `json:"count"`
		UnitPrice    float64 `json:"unitPrice"`
		BLNumber     string  `json:"blNumber"`
		DeliveryTime string  `json:"deliveryTime"`
		PickUpTime   string  `json:"pickUpTime"`
		Packaging    string  `json:"packaging"`
		Remarks      string  `json:"remarks"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": err.Error()})
		return
	}
	existing.Name = body.Name
	existing.ContractType = body.ContractType
	existing.ContractCode = body.ContractCode
	existing.BuyParty = body.BuyParty
	existing.SellParty = body.SellParty
	existing.Commodity = body.Commodity
	existing.Count = body.Count
	existing.UnitPrice = body.UnitPrice
	existing.BLNumber = body.BLNumber
	existing.DeliveryTime = body.DeliveryTime
	existing.PickUpTime = body.PickUpTime
	existing.Packaging = body.Packaging
	existing.Remarks = body.Remarks
	existing.UpdateTime = time.Now()
	if err := h.service.Update(existing); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "message": "updated"})
}

func (h *ContractHandler) UpdateWithFiles(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "invalid id"})
		return
	}

	form, err := c.MultipartForm()
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": err.Error()})
		return
	}

	formMap := make(map[string]string)
	for k, v := range form.Value {
		if len(v) > 0 {
			formMap[k] = v[0]
		}
	}

	keepFileIds := parseUintSlice(formMap["keepFileIds"])
	newFileHeaders := form.File["files"]

	if len(keepFileIds) == 0 && len(newFileHeaders) == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "至少需要保留一个合同扫描件"})
		return
	}

	var newFileModels []model.ContractFile
	path := "./data/contract/uploads"
	os.MkdirAll(path, os.ModePerm)

	for _, fh := range newFileHeaders {
		filename := fmt.Sprintf("%d_%s", time.Now().UnixNano(), fh.Filename)
		savePath := filepath.Join(path, filename)
		if err := c.SaveUploadedFile(fh, savePath); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
			return
		}
		newFileModels = append(newFileModels, model.ContractFile{
			Name: fh.Filename,
			URL:  "uploads/" + filename,
		})
	}

	if len(keepFileIds)+len(newFileModels) == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "至少需要保留一个合同扫描件"})
		return
	}

	if err := h.service.UpdateWithFiles(uint(id), keepFileIds, newFileModels, formMap); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "message": "updated"})
}

func parseUintSlice(s string) []uint {
	if s == "" {
		return nil
	}
	parts := strings.Split(s, ",")
	var result []uint
	for _, p := range parts {
		p = strings.TrimSpace(p)
		if p == "" {
			continue
		}
		if v, err := strconv.ParseUint(p, 10, 32); err == nil {
			result = append(result, uint(v))
		}
	}
	return result
}

func (h *ContractHandler) Delete(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "invalid id"})
		return
	}
	if err := h.service.Delete(uint(id)); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "message": "deleted"})
}

type ContractHandler struct {
	service         service.ContractService
	folderService   service.ContractFolderService
	batchService    service.ContractBatchService
}

func NewContractHandler(
	service service.ContractService,
	folderService service.ContractFolderService,
	batchService service.ContractBatchService,
) *ContractHandler {
	return &ContractHandler{
		service:       service,
		folderService: folderService,
		batchService:  batchService,
	}
}

func (h *ContractHandler) Upload(c *gin.Context) {

	var contract model.Contract

	contract.Name = c.PostForm("name")
	contract.ContractType = c.PostForm("contractType")
	contract.ContractCode = c.PostForm("contractCode")
	contract.BuyParty = c.PostForm("buyParty")
	contract.SellParty = c.PostForm("sellParty")
	contract.Commodity = c.PostForm("commodity")
	contract.BLNumber = c.PostForm("BLNumber")
	contract.DeliveryTime = c.PostForm("deliveryTime")
	contract.PickUpTime = c.PostForm("pickUpTime")
	contract.Packaging = c.PostForm("packaging")
	contract.Remarks = c.PostForm("remarks")

	if countStr := c.PostForm("count"); countStr != "" {
		if v, err := strconv.ParseFloat(countStr, 64); err == nil {
			contract.Count = v
		}
	}
	if priceStr := c.PostForm("unitPrice"); priceStr != "" {
		if v, err := strconv.ParseFloat(priceStr, 64); err == nil {
			contract.UnitPrice = v
		}
	}

	contract.CreateTime = time.Now()
	contract.UpdateTime = time.Now()

	form, err := c.MultipartForm()
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": err.Error()})
		return
	}

	files := form.File["files"]

	if len(files) == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "no files"})
		return
	}
	path := "./data/contract/uploads"
	os.MkdirAll(path, os.ModePerm)

	var fileModels []model.ContractFile

	for _, file := range files {

		filename := fmt.Sprintf("%d_%s", time.Now().UnixNano(), file.Filename)
		savePath := filepath.Join(path, filename)

		if err := c.SaveUploadedFile(file, savePath); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
			return
		}

		fileModels = append(fileModels, model.ContractFile{
			Name: file.Filename,
			URL:  "uploads/" + filename,
		})
	}

	if err := h.service.CreateContract(&contract, fileModels); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "upload success",
	})
}

func (h *ContractHandler) BatchUpload(c *gin.Context) {
	path := c.PostForm("path")
	if path == "" {

		c.JSON(http.StatusBadRequest, gin.H{"error": "path required"})
		return
	}

	form, err := c.MultipartForm()
	if err != nil {

		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid form"})
		return
	}

	files := form.File["files"]
	if len(files) == 0 {

		c.JSON(http.StatusBadRequest, gin.H{"error": "no files"})
		return
	}

	saved, err := h.service.BatchSaveFiles(path, files)
	if err != nil {

		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"count":   saved,
	})
}

// ========== 批量归档文件夹 ==========

func (h *ContractHandler) ListFolders(c *gin.Context) {
	list, err := h.folderService.List()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "data": list})
}

func (h *ContractHandler) CreateFolder(c *gin.Context) {
	var body struct {
		Name        string `json:"name" binding:"required"`
		Description string `json:"description"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": err.Error()})
		return
	}
	f, err := h.folderService.Create(body.Name, body.Description)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "data": f})
}

func (h *ContractHandler) GetFolder(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "invalid id"})
		return
	}
	f, err := h.folderService.GetByID(uint(id))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"success": false, "message": "not found"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "data": f})
}

func (h *ContractHandler) UpdateFolder(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "invalid id"})
		return
	}
	var body struct {
		Name        string `json:"name" binding:"required"`
		Description string `json:"description"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": err.Error()})
		return
	}
	if err := h.folderService.Update(uint(id), body.Name, body.Description); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "message": "updated"})
}

func (h *ContractHandler) DeleteFolder(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "invalid id"})
		return
	}
	if err := h.folderService.Delete(uint(id)); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "message": "deleted"})
}

// ========== 批量上传记录 ==========

func (h *ContractHandler) ListBatches(c *gin.Context) {
	var folderID *uint
	if idStr := c.Query("folderId"); idStr != "" {
		if id, err := strconv.ParseUint(idStr, 10, 32); err == nil {
			uid := uint(id)
			folderID = &uid
		}
	}
	list, err := h.batchService.List(folderID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "data": list})
}

func (h *ContractHandler) CreateBatch(c *gin.Context) {
	folderIDStr := c.PostForm("folderId")
	batchName := c.PostForm("batchName")
	remark := c.PostForm("remark")
	if folderIDStr == "" || batchName == "" {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "folderId and batchName required"})
		return
	}
	folderID, err := strconv.ParseUint(folderIDStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "invalid folderId"})
		return
	}
	form, err := c.MultipartForm()
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": err.Error()})
		return
	}
	files := form.File["files"]
	if len(files) == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "no files"})
		return
	}
	path := "./data/contract/batch_archive"
	os.MkdirAll(path, os.ModePerm)
	var fileModels []model.ContractBatchFile
	for _, file := range files {
		filename := fmt.Sprintf("%d_%s", time.Now().UnixNano(), file.Filename)
		savePath := filepath.Join(path, filename)
		if err := c.SaveUploadedFile(file, savePath); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
			return
		}
		fileModels = append(fileModels, model.ContractBatchFile{
			Name:     file.Filename,
			URL:      "batch_archive/" + filename,
			FileSize: file.Size,
		})
	}
	b, err := h.batchService.Create(uint(folderID), batchName, remark, fileModels)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "data": b, "message": "created"})
}

func (h *ContractHandler) GetBatch(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "invalid id"})
		return
	}
	b, err := h.batchService.GetByID(uint(id))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"success": false, "message": "not found"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "data": b})
}

func (h *ContractHandler) DeleteBatch(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "invalid id"})
		return
	}
	if err := h.batchService.Delete(uint(id)); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "message": "deleted"})
}