package handler

import (
	"encoding/json"
	"net/http"
	"strconv"
	"strings"

	"Engine/internal/model"
	"Engine/internal/service"
)

type BudgetHandler struct {
	svc *service.BudgetService
}

func NewBudgetHandler(svc *service.BudgetService) *BudgetHandler {
	return &BudgetHandler{svc: svc}
}

func (h *BudgetHandler) Create(w http.ResponseWriter, r *http.Request) {
	var req model.CreateBudgetRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}

	errs := req.Valid()
	if len(errs) > 0 {
		writeError(w, http.StatusBadRequest, strings.Join(errs, "; "))
		return
	}

	budget, err := h.svc.Create(r.Context(), req)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusCreated, budget)
}

func (h *BudgetHandler) Update(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(r.PathValue("id"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid id")
		return
	}
	var req model.UpdateBudgetRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}

	errs := req.Valid()
	if len(errs) > 0 {
		writeError(w, http.StatusBadRequest, strings.Join(errs, "; "))
		return
	}

	budget, err := h.svc.Update(r.Context(), id, req)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, budget)
}

func (h *BudgetHandler) Delete(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(r.PathValue("id"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid id")
		return
	}
	if err := h.svc.Delete(r.Context(), id); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	w.WriteHeader(http.StatusNoContent)
}