package handler

import (
	"log"
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/muyuqingfeng/iloom/purchaser-service/internal/service"
	"github.com/muyuqingfeng/iloom/shared/pkg/response"
	"github.com/muyuqingfeng/iloom/shared/pkg/websocket"
)

type ProductHandler struct {
	svc   *service.ProductService
	wsHub *websocket.Hub
}

func NewProductHandler(svc *service.ProductService, wsHub *websocket.Hub) *ProductHandler {
	return &ProductHandler{svc: svc, wsHub: wsHub}
}

type CreateProductReq struct {
	ProductName       string    `json:"product_name" binding:"required"`
	FabricCode        string    `json:"fabric_code" binding:"required"`
	Color             string    `json:"color" binding:"required"`
	ColorCode         string    `json:"color_code"`
	Weight            float64   `json:"weight"`
	YarnUsagePerMeter float64   `json:"yarn_usage_per_meter"`
	ProductionPrice   *float64  `json:"production_price"`
	YarnTypes         []string  `json:"yarn_types"`
	YarnRatios        []float64 `json:"yarn_ratios"`
}

type UpdateProductReq struct {
	ProductName       string    `json:"product_name"`
	FabricCode        string    `json:"fabric_code"`
	Color             string    `json:"color"`
	ColorCode         string    `json:"color_code"`
	Weight            float64   `json:"weight"`
	YarnUsagePerMeter float64   `json:"yarn_usage_per_meter"`
	ProductionPrice   *float64  `json:"production_price"`
	YarnTypes         []string  `json:"yarn_types"`
	YarnRatios        []float64 `json:"yarn_ratios"`
}

type InboundReq struct {
	BatchNo     string  `json:"batch_no" binding:"required"`
	Rolls       int     `json:"rolls" binding:"required,gt=0"`
	Meters      float64 `json:"meters" binding:"required,gt=0"`
	Notes       string  `json:"notes"`
	WarehouseID string  `json:"warehouse_id"`
}

type OutboundReq struct {
	BatchNo              string  `json:"batch_no"`
	Rolls                int     `json:"rolls" binding:"required,gt=0"`
	Meters               float64 `json:"meters" binding:"required,gt=0"`
	OutboundType         string  `json:"outbound_type"`
	Notes                string  `json:"notes"`
	RecipientCompanyID   string  `json:"recipient_company_id"`
	RecipientCompanyName string  `json:"recipient_company_name"`
	SourceBatchID        string  `json:"source_batch_id"`
	WashingPlanID        string  `json:"washing_plan_id"`
}

type UpdatePriceReq struct {
	NewPrice float64 `json:"new_price" binding:"required,gt=0"`
	Reason   string  `json:"reason"`
}

func (h *ProductHandler) List(c *gin.Context) {
	companyID := c.GetHeader("X-Company-ID")
	if companyID == "" {
		response.BadRequest(c, "missing company id")
		return
	}

	products, err := h.svc.List(c.Request.Context(), companyID)
	if err != nil {
		log.Printf("list products error: %v", err)
		response.InternalError(c, "failed to list products")
		return
	}
	response.OK(c, products)
}

func (h *ProductHandler) Create(c *gin.Context) {
	companyID := c.GetHeader("X-Company-ID")
	if companyID == "" {
		response.BadRequest(c, "missing company id")
		return
	}

	var req CreateProductReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}

	svcReq := service.CreateProductRequest{
		ProductName:       req.ProductName,
		FabricCode:        req.FabricCode,
		Color:             req.Color,
		ColorCode:         req.ColorCode,
		Weight:            req.Weight,
		YarnUsagePerMeter: req.YarnUsagePerMeter,
		ProductionPrice:   req.ProductionPrice,
		YarnTypes:         req.YarnTypes,
		YarnRatios:        req.YarnRatios,
	}

	product, err := h.svc.Create(c.Request.Context(), companyID, svcReq)
	if err != nil {
		log.Printf("create product error: %v", err)
		response.InternalError(c, "failed to create product")
		return
	}

	h.wsHub.BroadcastToCompany(companyID, &websocket.Event{
		Table:  "products",
		Action: "INSERT",
	})

	c.JSON(http.StatusCreated, response.Response{
		Code:    0,
		Message: "success",
		Data:    product,
	})
}

func (h *ProductHandler) Update(c *gin.Context) {
	companyID := c.GetHeader("X-Company-ID")
	if companyID == "" {
		response.BadRequest(c, "missing company id")
		return
	}

	id := c.Param("id")

	var req UpdateProductReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}

	svcReq := service.UpdateProductRequest{
		ProductName:       req.ProductName,
		FabricCode:        req.FabricCode,
		Color:             req.Color,
		ColorCode:         req.ColorCode,
		Weight:            req.Weight,
		YarnUsagePerMeter: req.YarnUsagePerMeter,
		ProductionPrice:   req.ProductionPrice,
		YarnTypes:         req.YarnTypes,
		YarnRatios:        req.YarnRatios,
	}

	if err := h.svc.Update(c.Request.Context(), id, companyID, svcReq); err != nil {
		log.Printf("update product error: %v", err)
		response.InternalError(c, "failed to update product")
		return
	}

	h.wsHub.BroadcastToCompany(companyID, &websocket.Event{
		Table:  "products",
		Action: "UPDATE",
	})

	response.OK(c, nil)
}

func (h *ProductHandler) Delete(c *gin.Context) {
	companyID := c.GetHeader("X-Company-ID")
	if companyID == "" {
		response.BadRequest(c, "missing company id")
		return
	}

	id := c.Param("id")
	if err := h.svc.Delete(c.Request.Context(), id, companyID); err != nil {
		log.Printf("delete product error: %v", err)
		response.InternalError(c, "failed to delete product")
		return
	}

	h.wsHub.BroadcastToCompany(companyID, &websocket.Event{
		Table:  "products",
		Action: "DELETE",
	})

	response.OK(c, nil)
}

func (h *ProductHandler) Inbound(c *gin.Context) {
	companyID := c.GetHeader("X-Company-ID")
	userID := c.GetHeader("X-User-ID")
	if companyID == "" || userID == "" {
		response.BadRequest(c, "missing user or company id")
		return
	}

	productID := c.Param("id")

	var req InboundReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}

	svcReq := service.InboundRequest{
		BatchNo:     req.BatchNo,
		Rolls:       req.Rolls,
		Meters:      req.Meters,
		Notes:       req.Notes,
		WarehouseID: req.WarehouseID,
	}

	if err := h.svc.Inbound(c.Request.Context(), productID, companyID, userID, svcReq); err != nil {
		log.Printf("inbound error: %v", err)
		response.InternalError(c, "failed to inbound")
		return
	}

	h.wsHub.BroadcastToCompany(companyID, &websocket.Event{
		Table:  "product_inventory_records",
		Action: "INSERT",
	})

	response.OK(c, nil)
}

func (h *ProductHandler) Outbound(c *gin.Context) {
	companyID := c.GetHeader("X-Company-ID")
	userID := c.GetHeader("X-User-ID")
	if companyID == "" || userID == "" {
		response.BadRequest(c, "missing user or company id")
		return
	}

	productID := c.Param("id")

	var req OutboundReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}

	svcReq := service.OutboundRequest{
		BatchNo:              req.BatchNo,
		Rolls:                req.Rolls,
		Meters:               req.Meters,
		OutboundType:         req.OutboundType,
		Notes:                req.Notes,
		RecipientCompanyID:   req.RecipientCompanyID,
		RecipientCompanyName: req.RecipientCompanyName,
		SourceBatchID:        req.SourceBatchID,
		WashingPlanID:        req.WashingPlanID,
	}

	if err := h.svc.Outbound(c.Request.Context(), productID, companyID, userID, svcReq); err != nil {
		log.Printf("outbound error: %v", err)
		response.InternalError(c, "failed to outbound")
		return
	}

	h.wsHub.BroadcastToCompany(companyID, &websocket.Event{
		Table:  "product_outbound_records",
		Action: "INSERT",
	})

	response.OK(c, nil)
}

func (h *ProductHandler) Records(c *gin.Context) {
	productID := c.Param("id")
	records, err := h.svc.Records(c.Request.Context(), productID)
	if err != nil {
		log.Printf("get records error: %v", err)
		response.InternalError(c, "failed to get records")
		return
	}
	response.OK(c, records)
}

func (h *ProductHandler) UpdatePrice(c *gin.Context) {
	companyID := c.GetHeader("X-Company-ID")
	userID := c.GetHeader("X-User-ID")
	if companyID == "" || userID == "" {
		response.BadRequest(c, "missing user or company id")
		return
	}

	productID := c.Param("id")

	var req UpdatePriceReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}

	if err := h.svc.UpdatePrice(c.Request.Context(), productID, companyID, userID, req.NewPrice, req.Reason); err != nil {
		log.Printf("update price error: %v", err)
		response.InternalError(c, "failed to update price")
		return
	}

	response.OK(c, nil)
}

func (h *ProductHandler) PriceHistory(c *gin.Context) {
	productID := c.Param("id")
	history, err := h.svc.PriceHistory(c.Request.Context(), productID)
	if err != nil {
		log.Printf("get price history error: %v", err)
		response.InternalError(c, "failed to get price history")
		return
	}
	response.OK(c, history)
}