package handlers

import (
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"github.com/shopspring/decimal"
	"go.uber.org/zap"

	"rmser/internal/services/drafts"
	"rmser/pkg/logger"
)

type DraftsHandler struct {
	service *drafts.Service
}

func NewDraftsHandler(service *drafts.Service) *DraftsHandler {
	return &DraftsHandler{service: service}
}

// GetDraft возвращает полные данные черновика
func (h *DraftsHandler) GetDraft(c *gin.Context) {
	idStr := c.Param("id")
	id, err := uuid.Parse(idStr)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}

	draft, err := h.service.GetDraft(id)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "draft not found"})
		return
	}
	c.JSON(http.StatusOK, draft)
}

// GetStores возвращает список складов
func (h *DraftsHandler) GetStores(c *gin.Context) {
	stores, err := h.service.GetActiveStores()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, stores)
}

// UpdateItemDTO - тело запроса на изменение строки
type UpdateItemDTO struct {
	ProductID   *string `json:"product_id"`
	ContainerID *string `json:"container_id"`
	Quantity    float64 `json:"quantity"`
	Price       float64 `json:"price"`
}

func (h *DraftsHandler) UpdateItem(c *gin.Context) {
	draftID, _ := uuid.Parse(c.Param("id"))
	itemID, _ := uuid.Parse(c.Param("itemId"))

	var req UpdateItemDTO
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	var pID *uuid.UUID
	if req.ProductID != nil && *req.ProductID != "" {
		if uid, err := uuid.Parse(*req.ProductID); err == nil {
			pID = &uid
		}
	}

	var cID *uuid.UUID
	if req.ContainerID != nil && *req.ContainerID != "" {
		if uid, err := uuid.Parse(*req.ContainerID); err == nil {
			cID = &uid
		}
	}

	qty := decimal.NewFromFloat(req.Quantity)
	price := decimal.NewFromFloat(req.Price)

	if err := h.service.UpdateItem(draftID, itemID, pID, cID, qty, price); err != nil {
		logger.Log.Error("Failed to update item", zap.Error(err))
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"status": "updated"})
}

type CommitRequestDTO struct {
	DateIncoming string `json:"date_incoming"` // YYYY-MM-DD
	StoreID      string `json:"store_id"`
	SupplierID   string `json:"supplier_id"`
	Comment      string `json:"comment"`
}

// CommitDraft сохраняет шапку и отправляет в RMS
func (h *DraftsHandler) CommitDraft(c *gin.Context) {
	draftID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid draft id"})
		return
	}

	var req CommitRequestDTO
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// Парсинг данных шапки
	date, err := time.Parse("2006-01-02", req.DateIncoming)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid date format (YYYY-MM-DD)"})
		return
	}
	storeID, err := uuid.Parse(req.StoreID)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid store id"})
		return
	}
	supplierID, err := uuid.Parse(req.SupplierID)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid supplier id"})
		return
	}

	// 1. Обновляем шапку
	if err := h.service.UpdateDraftHeader(draftID, &storeID, &supplierID, date, req.Comment); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to update header: " + err.Error()})
		return
	}

	// 2. Отправляем
	docNum, err := h.service.CommitDraft(draftID)
	if err != nil {
		logger.Log.Error("Commit failed", zap.Error(err))
		c.JSON(http.StatusBadGateway, gin.H{"error": "RMS error: " + err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"status":          "completed",
		"document_number": docNum,
	})
}