package handler

import (
	"errors"
	"log"
	"net/http"
	"strings"

	"github.com/saveinmed/backend-go/internal/domain"
	"github.com/saveinmed/backend-go/internal/http/middleware"
)

// CreateOrder godoc
// @Summary Criação de pedido com split
// @Tags Pedidos
// @Accept json
// @Produce json
// @Param order body createOrderRequest true "Pedido"
// @Success 201 {object} domain.Order
// @Router /api/v1/orders [post]
func (h *Handler) CreateOrder(w http.ResponseWriter, r *http.Request) {
	var req createOrderRequest
	if err := decodeJSON(r.Context(), r, &req); err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	claims, ok := middleware.GetClaims(r.Context())
	if !ok || claims.CompanyID == nil {
		writeError(w, http.StatusBadRequest, errors.New("missing buyer context"))
		return
	}

	order := &domain.Order{
		BuyerID:       *claims.CompanyID,
		SellerID:      req.SellerID,
		Items:         req.Items,
		Shipping:      req.Shipping,
		PaymentMethod: domain.PaymentMethod(req.PaymentMethod.Type),
	}

	var total int64
	for _, item := range req.Items {
		total += item.UnitCents * item.Quantity
	}
	order.TotalCents = total

	if err := h.svc.CreateOrder(r.Context(), order); err != nil {
		writeError(w, http.StatusInternalServerError, err)
		return
	}

	writeJSON(w, http.StatusCreated, order)
}

// ListOrders godoc
// @Summary Listar pedidos
// @Tags Pedidos
// @Security BearerAuth
// @Produce json
// @Success 200 {array} domain.Order
// @Router /api/v1/orders [get]
func (h *Handler) ListOrders(w http.ResponseWriter, r *http.Request) {
	log.Printf("📦 [ListOrders] ========== INÍCIO ==========")
	log.Printf("📦 [ListOrders] URL: %s", r.URL.String())
	log.Printf("📦 [ListOrders] Method: %s", r.Method)

	page, pageSize := parsePagination(r)
	log.Printf("📦 [ListOrders] Paginação: page=%d, pageSize=%d", page, pageSize)

	filter := domain.OrderFilter{}

	// Parse role query param for filtering
	log.Printf("🔐 [ListOrders] Obtendo requester do contexto...")
	requester, err := getRequester(r)
	if err != nil {
		log.Printf("❌ [ListOrders] ERRO ao obter requester: %v", err)
		writeError(w, http.StatusUnauthorized, err)
		return
	}
	log.Printf("✅ [ListOrders] Requester obtido: Role=%s, CompanyID=%v",
		requester.Role, requester.CompanyID)

	role := r.URL.Query().Get("role")
	log.Printf("🎭 [ListOrders] Role query param: '%s'", role)

	// Determine effective role for filtering
	effectiveRole := role
	if effectiveRole == "" {
		// Default to requester role if not provided in query param
		effectiveRole = strings.ToLower(requester.Role)
		// Map role variants to canonical filter roles
		switch effectiveRole {
		case "dono", "vendedor", "seller", "owner", "comprador", "gerente", "manager":
			effectiveRole = "owner"
		case "colaborador", "employee":
			// Colaboradores pertencem a uma empresa compradora/vendedora;
			// filtramos como buyer para que vejam apenas pedidos da sua empresa.
			effectiveRole = "buyer"
		}
		log.Printf("🎭 [ListOrders] Effective role derived from requester: '%s'", effectiveRole)
	}

	if requester.CompanyID != nil {
		log.Printf("🏢 [ListOrders] CompanyID do requester: %s", *requester.CompanyID)
		switch effectiveRole {
		case "buyer":
			filter.BuyerID = requester.CompanyID
			log.Printf("🛒 [ListOrders] Filtro aplicado: BuyerID=%s", *requester.CompanyID)
		case "owner":
			filter.SellerID = requester.CompanyID
			log.Printf("💰 [ListOrders] Filtro aplicado: SellerID=%s", *requester.CompanyID)
		default:
			// Admin ou role desconhecido sem filtro explícito: retorna apenas da própria empresa
			if !domain.IsAdminRole(requester.Role) {
				filter.BuyerID = requester.CompanyID
				log.Printf("🔒 [ListOrders] Fallback seguro: BuyerID=%s", *requester.CompanyID)
			}
		}
	} else {
		log.Printf("⚠️ [ListOrders] Sem filtro de role aplicado. effectiveRole='%s', CompanyID=%v", effectiveRole, requester.CompanyID)
	}

	log.Printf("🔍 [ListOrders] Chamando svc.ListOrders com filter=%+v", filter)
	result, err := h.svc.ListOrders(r.Context(), filter, page, pageSize)
	if err != nil {
		log.Printf("❌ [ListOrders] ERRO no service ListOrders: %v", err)
		writeError(w, http.StatusInternalServerError, err)
		return
	}

	log.Printf("✅ [ListOrders] Sucesso! Total de pedidos: %d", result.Total)
	log.Printf("📦 [ListOrders] ========== FIM ==========")
	writeJSON(w, http.StatusOK, result)
}

// GetOrder godoc
// @Summary Consulta pedido
// @Tags Pedidos
// @Security BearerAuth
// @Produce json
// @Param id path string true "Order ID"
// @Success 200 {object} domain.Order
// @Router /api/v1/orders/{id} [get]
func (h *Handler) GetOrder(w http.ResponseWriter, r *http.Request) {
	id, err := parseUUIDFromPath(r.URL.Path)
	if err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	order, err := h.svc.GetOrder(r.Context(), id)
	if err != nil {
		writeError(w, http.StatusNotFound, err)
		return
	}

	// Security: non-Admin can only see orders of their own company
	if claims, ok := middleware.GetClaims(r.Context()); ok {
		if !domain.IsAdminRole(claims.Role) {
			if claims.CompanyID == nil || (order.BuyerID != *claims.CompanyID && order.SellerID != *claims.CompanyID) {
				writeError(w, http.StatusForbidden, errors.New("access denied: order does not belong to your company"))
				return
			}
		}
	}

	writeJSON(w, http.StatusOK, order)
}

// UpdateOrder godoc
// @Summary Atualizar itens do pedido
// @Tags Pedidos
// @Security BearerAuth
// @Accept json
// @Produce json
// @Param id path string true "Order ID"
// @Param order body createOrderRequest true "Novos dados (itens)"
// @Success 200 {object} domain.Order
// @Router /api/v1/orders/{id} [put]
func (h *Handler) UpdateOrder(w http.ResponseWriter, r *http.Request) {
	id, err := parseUUIDFromPath(r.URL.Path)
	if err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	var req createOrderRequest
	if err := decodeJSON(r.Context(), r, &req); err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	var total int64
	for _, item := range req.Items {
		total += item.UnitCents * item.Quantity
	}

	// FIX: UpdateOrderItems expects []domain.OrderItem
	// req.Items is []domain.OrderItem (from dto.go definition)

	if err := h.svc.UpdateOrderItems(r.Context(), id, req.Items, total); err != nil {
		writeError(w, http.StatusInternalServerError, err)
		return
	}

	// Return updated order
	order, err := h.svc.GetOrder(r.Context(), id)
	if err != nil {
		writeJSON(w, http.StatusOK, map[string]string{"status": "updated"})
		return
	}

	writeJSON(w, http.StatusOK, order)
}

// UpdateOrderStatus godoc
// @Summary Atualiza status do pedido
// @Tags Pedidos
// @Security BearerAuth
// @Accept json
// @Produce json
// @Param id path string true "Order ID"
// @Param status body updateStatusRequest true "Novo status"
// @Success 204 ""
// @Router /api/v1/orders/{id}/status [patch]
func (h *Handler) UpdateOrderStatus(w http.ResponseWriter, r *http.Request) {
	id, err := parseUUIDFromPath(r.URL.Path)
	if err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	var req updateStatusRequest
	if err := decodeJSON(r.Context(), r, &req); err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	if !isValidStatus(req.Status) {
		writeError(w, http.StatusBadRequest, errors.New("invalid status"))
		return
	}

	// Security: non-Admin can only update status of orders from their own company
	if claims, ok := middleware.GetClaims(r.Context()); ok {
		if !domain.IsAdminRole(claims.Role) {
			order, err := h.svc.GetOrder(r.Context(), id)
			if err != nil {
				writeError(w, http.StatusNotFound, err)
				return
			}
			if claims.CompanyID == nil || (order.BuyerID != *claims.CompanyID && order.SellerID != *claims.CompanyID) {
				writeError(w, http.StatusForbidden, errors.New("access denied: order does not belong to your company"))
				return
			}
		}
	}

	if err := h.svc.UpdateOrderStatus(r.Context(), id, domain.OrderStatus(req.Status)); err != nil {
		writeError(w, http.StatusInternalServerError, err)
		return
	}

	w.WriteHeader(http.StatusNoContent)
}

// DeleteOrder godoc
// @Summary Remover pedido
// @Tags Pedidos
// @Security BearerAuth
// @Param id path string true "Order ID"
// @Success 204 ""
// @Failure 400 {object} map[string]string
// @Failure 404 {object} map[string]string
// @Router /api/v1/orders/{id} [delete]
func (h *Handler) DeleteOrder(w http.ResponseWriter, r *http.Request) {
	id, err := parseUUIDFromPath(r.URL.Path)
	if err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	// Security: non-Admin can only delete orders where they are the buyer
	if claims, ok := middleware.GetClaims(r.Context()); ok {
		if !domain.IsAdminRole(claims.Role) {
			order, err := h.svc.GetOrder(r.Context(), id)
			if err != nil {
				writeError(w, http.StatusNotFound, err)
				return
			}
			if claims.CompanyID == nil || order.BuyerID != *claims.CompanyID {
				writeError(w, http.StatusForbidden, errors.New("access denied: only the buyer company can delete an order"))
				return
			}
		}
	}

	if err := h.svc.DeleteOrder(r.Context(), id); err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	w.WriteHeader(http.StatusNoContent)
}