package handler

import (
	"errors"
	"net/http"

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

// CreateReview godoc
// @Summary Criar avaliação
// @Tags Avaliações
// @Security BearerAuth
// @Accept json
// @Produce json
// @Param payload body createReviewRequest true "Dados da avaliação"
// @Success 201 {object} domain.Review
// @Failure 400 {object} map[string]string
// @Router /api/v1/reviews [post]
// CreateReview allows buyers to rate the seller after delivery.
func (h *Handler) CreateReview(w http.ResponseWriter, r *http.Request) {
	claims, ok := middleware.GetClaims(r.Context())
	if !ok || claims.CompanyID == nil {
		writeError(w, http.StatusBadRequest, errors.New("missing buyer context"))
		return
	}

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

	review, err := h.svc.CreateReview(r.Context(), *claims.CompanyID, req.OrderID, req.Rating, req.Comment)
	if err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	writeJSON(w, http.StatusCreated, review)
}

// AddToCart godoc
// @Summary Adicionar item ao carrinho
// @Tags Carrinho
// @Security BearerAuth
// @Accept json
// @Produce json
// @Param payload body addCartItemRequest true "Item do carrinho"
// @Success 201 {object} domain.CartSummary
// @Failure 400 {object} map[string]string
// @Router /api/v1/cart [post]
// AddToCart appends an item to the authenticated buyer cart respecting stock.
func (h *Handler) AddToCart(w http.ResponseWriter, r *http.Request) {
	claims, ok := middleware.GetClaims(r.Context())
	if !ok || claims.CompanyID == nil {
		writeError(w, http.StatusBadRequest, errors.New("missing buyer context"))
		return
	}

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

	summary, err := h.svc.AddItemToCart(r.Context(), *claims.CompanyID, req.ProductID, req.Quantity)
	if err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	writeJSON(w, http.StatusCreated, summary)
}

// GetCart godoc
// @Summary Obter carrinho
// @Tags Carrinho
// @Security BearerAuth
// @Produce json
// @Success 200 {object} domain.CartSummary
// @Router /api/v1/cart [get]
// GetCart returns cart contents and totals for the authenticated buyer.
func (h *Handler) GetCart(w http.ResponseWriter, r *http.Request) {
	claims, ok := middleware.GetClaims(r.Context())
	if !ok || claims.CompanyID == nil {
		writeError(w, http.StatusBadRequest, errors.New("missing buyer context"))
		return
	}

	summary, err := h.svc.ListCart(r.Context(), *claims.CompanyID)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err)
		return
	}
	writeJSON(w, http.StatusOK, summary)
}

// DeleteCartItem godoc
// @Summary Remover item do carrinho
// @Tags Carrinho
// @Security BearerAuth
// @Param id path string true "Cart item ID"
// @Success 200 {object} domain.CartSummary
// @Failure 400 {object} map[string]string
// @Router /api/v1/cart/{id} [delete]
// DeleteCartItem removes a product from the cart and returns the updated totals.
func (h *Handler) DeleteCartItem(w http.ResponseWriter, r *http.Request) {
	claims, ok := middleware.GetClaims(r.Context())
	if !ok || claims.CompanyID == nil {
		writeError(w, http.StatusBadRequest, errors.New("missing buyer context"))
		return
	}

	id, err := parseUUIDFromPath(r.URL.Path)
	if err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	summary, err := h.svc.RemoveCartItem(r.Context(), *claims.CompanyID, id)
	if err != nil {
		writeError(w, http.StatusBadRequest, err)
		return
	}

	writeJSON(w, http.StatusOK, summary)
}