package handler

import (
	"strconv"
	"strings"

	"affiliate_dash/internal/middleware"
	"affiliate_dash/internal/pkg/response"
	"affiliate_dash/internal/service"

	"github.com/gin-gonic/gin"
)

func (h *MerchantHandler) ListOrders(c *gin.Context) {
	page, size := pageParams(c)
	orderSource := strings.TrimSpace(c.Query("order_source"))
	list, total, err := h.fulfillmentSvc.ListOrders(middleware.GetMerchantID(c), page, size, c.Query("order_status"), orderSource, c.Query("keyword"))
	if err != nil {
		if err.Error() == "无效的订单来源" || err.Error() == "无效的订单状态" {
			response.BadRequest(c, err.Error())
			return
		}
		response.ServerError(c, err.Error())
		return
	}
	response.Page(c, list, total, page, size)
}

// ListPlatformOrders GET /api/platform/orders
//
// 平台管理员跨商户查看下游订单。merchant_id 查询参数可选：不传表示全部商户。
// 与商户侧 /api/merchant/orders 是两条独立路径——商户侧仍强制单商户隔离，
// 这里不依赖 X-Merchant-ID，因此管理员遗留的商户上下文不会影响本接口。
func (h *MerchantHandler) ListPlatformOrders(c *gin.Context) {
	page, size := pageParams(c)

	var merchantID *uint
	if raw := strings.TrimSpace(c.Query("merchant_id")); raw != "" {
		id, err := strconv.ParseUint(raw, 10, 64)
		if err != nil || id == 0 {
			response.BadRequest(c, "商户 ID 无效")
			return
		}
		value := uint(id)
		merchantID = &value
	}

	list, total, err := h.fulfillmentSvc.ListPlatformOrders(merchantID, page, size, c.Query("order_status"), c.Query("order_source"), c.Query("keyword"))
	if err != nil {
		if err.Error() == "无效的订单来源" || err.Error() == "无效的订单状态" {
			response.BadRequest(c, err.Error())
			return
		}
		response.ServerError(c, err.Error())
		return
	}
	response.Page(c, list, total, page, size)
}

type merchantManualOrderReq struct {
	ClientOrderNo  string `json:"client_order_no" binding:"required,max=96"`
	SKU            string `json:"sku" binding:"required,max=96"`
	Quantity       int64  `json:"quantity"`
	BuyerReference string `json:"buyer_reference" binding:"max=128"`
	GameAccount    string `json:"game_account" binding:"max=128"`
	Note           string `json:"note" binding:"max=512"`
}

// CreateManualOrder 在商户后台创建真实订单；扣款、库存和回调与开放 API 下单保持一致。
func (h *MerchantHandler) CreateManualOrder(c *gin.Context) {
	var req merchantManualOrderReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "参数错误：商户单号与商品必填")
		return
	}
	data := map[string]string{}
	if gameAccount := strings.TrimSpace(req.GameAccount); gameAccount != "" {
		data["game_account"] = gameAccount
	}
	if note := strings.TrimSpace(req.Note); note != "" {
		data["manual_note"] = note
	}
	result, err := h.fulfillmentSvc.CreateManualOrder(service.CreateManualOrderInput{
		MerchantID:     middleware.GetMerchantID(c),
		ActorUserID:    middleware.GetUserID(c),
		ClientOrderNo:  req.ClientOrderNo,
		SKU:            req.SKU,
		Quantity:       req.Quantity,
		BuyerReference: req.BuyerReference,
		RequestData:    data,
	})
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	canShip, cannotShipReason := service.CanFulfill(result.Order)
	response.OK(c, gin.H{
		"order":              result.Order,
		"idempotent":         result.Idempotent,
		"can_ship":           canShip,
		"cannot_ship_reason": cannotShipReason,
	})
}

type merchantTestOrderReq struct {
	SKU            string `json:"sku" binding:"required"`
	BuyerReference string `json:"buyer_reference"`
	Note           string `json:"note"`
	OrderStatus    string `json:"order_status"`
}

func (h *MerchantHandler) CreateTestOrder(c *gin.Context) {
	var req merchantTestOrderReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "参数错误：sku 必填")
		return
	}
	order, err := h.fulfillmentSvc.CreateTestOrder(service.CreateTestOrderInput{
		MerchantID:     middleware.GetMerchantID(c),
		ActorUserID:    middleware.GetUserID(c),
		SKU:            req.SKU,
		BuyerReference: req.BuyerReference,
		Note:           req.Note,
		OrderStatus:    req.OrderStatus,
	})
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	canShip, cannotShipReason := service.CanFulfill(order)
	response.OK(c, gin.H{
		"order":              order,
		"can_ship":           canShip,
		"cannot_ship_reason": cannotShipReason,
	})
}

type merchantCancelOrderReq struct {
	Reason string `json:"reason" binding:"required,max=512"`
}

// CancelOrder 商户后台取消订单：全额退还积分并回补库存，取消后订单不可再发货。
func (h *MerchantHandler) CancelOrder(c *gin.Context) {
	var req merchantCancelOrderReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "参数错误：取消原因必填且最长 512 字")
		return
	}
	order, err := h.fulfillmentSvc.CancelOrderByUser(middleware.GetMerchantID(c), middleware.GetUserID(c), c.Param("order_no"), req.Reason)
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{
		"order":         order,
		"refund_amount": order.Amount,
	})
}

func (h *MerchantHandler) GetDeliveryLink(c *gin.Context) {
	link, err := h.deliverySvc.GetOrCreateDeliveryLink(middleware.GetMerchantID(c), c.Param("order_no"), requestBaseURL(c))
	if err != nil {
		writeDeliveryError(c, err)
		return
	}
	response.OK(c, link)
}

func (h *MerchantHandler) RevokeDeliveryLink(c *gin.Context) {
	if err := h.deliverySvc.RevokeDeliveryLink(middleware.GetMerchantID(c), middleware.GetUserID(c), c.Param("order_no")); err != nil {
		writeDeliveryError(c, err)
		return
	}
	response.OK(c, nil)
}

func (h *MerchantHandler) RestoreDeliveryLink(c *gin.Context) {
	link, err := h.deliverySvc.RestoreDeliveryLink(middleware.GetMerchantID(c), middleware.GetUserID(c), c.Param("order_no"), requestBaseURL(c))
	if err != nil {
		writeDeliveryError(c, err)
		return
	}
	response.OK(c, link)
}