package handlers

import (
	"database/sql"
	"encoding/json"
	"net/http"
	"strconv"

	"code.springupsoftware.com/cmc/cmc-sales/internal/cmc/db"
	"github.com/gorilla/mux"
)

type ProductHandler struct {
	queries *db.Queries
}

func NewProductHandler(queries *db.Queries) *ProductHandler {
	return &ProductHandler{queries: queries}
}

func (h *ProductHandler) List(w http.ResponseWriter, r *http.Request) {
	limit := 50
	offset := 0

	if l := r.URL.Query().Get("limit"); l != "" {
		if val, err := strconv.Atoi(l); err == nil {
			limit = val
		}
	}

	if o := r.URL.Query().Get("offset"); o != "" {
		if val, err := strconv.Atoi(o); err == nil {
			offset = val
		}
	}

	products, err := h.queries.ListProducts(r.Context(), db.ListProductsParams{
		Limit:  int32(limit),
		Offset: int32(offset),
	})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(products)
}

func (h *ProductHandler) Get(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid product ID", http.StatusBadRequest)
		return
	}

	product, err := h.queries.GetProduct(r.Context(), int32(id))
	if err != nil {
		if err == sql.ErrNoRows {
			http.Error(w, "Product not found", http.StatusNotFound)
			return
		}
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(product)
}

func (h *ProductHandler) Create(w http.ResponseWriter, r *http.Request) {
	var params db.CreateProductParams
	if err := json.NewDecoder(r.Body).Decode(&params); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	result, err := h.queries.CreateProduct(r.Context(), params)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	id, err := result.LastInsertId()
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(map[string]interface{}{
		"id": id,
	})
}

func (h *ProductHandler) Update(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid product ID", http.StatusBadRequest)
		return
	}

	var params db.UpdateProductParams
	if err := json.NewDecoder(r.Body).Decode(&params); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	params.ID = int32(id)

	if err := h.queries.UpdateProduct(r.Context(), params); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusNoContent)
}

func (h *ProductHandler) Delete(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid product ID", http.StatusBadRequest)
		return
	}

	if err := h.queries.DeleteProduct(r.Context(), int32(id)); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusNoContent)
}

func (h *ProductHandler) Search(w http.ResponseWriter, r *http.Request) {
	query := r.URL.Query().Get("q")
	if query == "" {
		http.Error(w, "Search query required", http.StatusBadRequest)
		return
	}

	limit := 50
	offset := 0

	if l := r.URL.Query().Get("limit"); l != "" {
		if val, err := strconv.Atoi(l); err == nil {
			limit = val
		}
	}

	if o := r.URL.Query().Get("offset"); o != "" {
		if val, err := strconv.Atoi(o); err == nil {
			offset = val
		}
	}

	products, err := h.queries.SearchProductsByTitle(r.Context(), db.SearchProductsByTitleParams{
		CONCAT: query,
		Limit:  int32(limit),
		Offset: int32(offset),
	})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(products)
}