package handler

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

	"github.com/go-chi/chi/v5"

	"financeiro-carvalho/internal/model"
	"financeiro-carvalho/internal/service"
)

type AccountHandler struct {
	svc *service.AccountService
}

func NewAccountHandler(svc *service.AccountService) *AccountHandler {
	return &AccountHandler{svc: svc}
}

func (h *AccountHandler) List(w http.ResponseWriter, r *http.Request) {
	items, err := h.svc.List(r.Context())
	if err != nil {
		respondError(w, http.StatusInternalServerError, "failed to list accounts")
		return
	}
	if items == nil {
		items = []model.Account{}
	}
	respondJSON(w, http.StatusOK, items)
}

func (h *AccountHandler) Create(w http.ResponseWriter, r *http.Request) {
	var in model.AccountInput
	if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
		respondError(w, http.StatusBadRequest, "invalid JSON")
		return
	}
	out, err := h.svc.Create(r.Context(), in)
	if err != nil {
		if errors.Is(err, service.ErrAccountEmptyName) || errors.Is(err, service.ErrAccountInvalidType) {
			respondError(w, http.StatusUnprocessableEntity, err.Error())
			return
		}
		respondError(w, http.StatusInternalServerError, "failed to create account")
		return
	}
	respondJSON(w, http.StatusCreated, out)
}

func (h *AccountHandler) Update(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(chi.URLParam(r, "id"))
	if err != nil {
		respondError(w, http.StatusBadRequest, "invalid id")
		return
	}
	var in model.AccountInput
	if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
		respondError(w, http.StatusBadRequest, "invalid JSON")
		return
	}
	out, err := h.svc.Update(r.Context(), id, in)
	if err != nil {
		if errors.Is(err, service.ErrAccountEmptyName) || errors.Is(err, service.ErrAccountInvalidType) {
			respondError(w, http.StatusUnprocessableEntity, err.Error())
			return
		}
		respondError(w, http.StatusInternalServerError, "failed to update account")
		return
	}
	respondJSON(w, http.StatusOK, out)
}

func (h *AccountHandler) Delete(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(chi.URLParam(r, "id"))
	if err != nil {
		respondError(w, http.StatusBadRequest, "invalid id")
		return
	}
	if err := h.svc.Delete(r.Context(), id); err != nil {
		respondError(w, http.StatusInternalServerError, "failed to delete account")
		return
	}
	w.WriteHeader(http.StatusNoContent)
}