package handler

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

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

	"financeiro-carvalho/internal/service"
)

type CreditBillHandler struct {
	svc *service.CreditBillService
}

func NewCreditBillHandler(svc *service.CreditBillService) *CreditBillHandler {
	return &CreditBillHandler{svc: svc}
}

func (h *CreditBillHandler) ListByAccount(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(chi.URLParam(r, "id"))
	if err != nil {
		respondError(w, http.StatusBadRequest, "invalid id")
		return
	}
	bills, err := h.svc.ListByAccount(r.Context(), id)
	if err != nil {
		respondError(w, http.StatusInternalServerError, "failed to list bills")
		return
	}
	respondJSON(w, http.StatusOK, bills)
}

func (h *CreditBillHandler) GetCurrent(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(chi.URLParam(r, "id"))
	if err != nil {
		respondError(w, http.StatusBadRequest, "invalid id")
		return
	}
	bill, err := h.svc.GetCurrent(r.Context(), id)
	if err != nil {
		respondError(w, http.StatusInternalServerError, "failed to get current bill")
		return
	}
	if bill == nil {
		respondJSON(w, http.StatusOK, nil)
		return
	}
	respondJSON(w, http.StatusOK, bill)
}

func (h *CreditBillHandler) EnsureCurrent(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 body struct {
		ClosingDay int `json:"closing_day"`
		DueDay     int `json:"due_day"`
	}
	_ = json.NewDecoder(r.Body).Decode(&body)
	if err := h.svc.EnsureCurrentBill(r.Context(), id, body.ClosingDay, body.DueDay); err != nil {
		respondError(w, http.StatusInternalServerError, "failed to ensure bill")
		return
	}
	w.WriteHeader(http.StatusNoContent)
}

func (h *CreditBillHandler) MarkPaid(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 body struct {
		PaymentAccountID *int `json:"payment_account_id"`
	}
	_ = json.NewDecoder(r.Body).Decode(&body)
	if err := h.svc.MarkPaid(r.Context(), id, body.PaymentAccountID); err != nil {
		respondError(w, http.StatusInternalServerError, "failed to mark bill paid")
		return
	}
	w.WriteHeader(http.StatusNoContent)
}