// Package handlers
package handlers

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

	"github.com/go-chi/chi/v5"
	"github.com/photoplaces/backend/internal/middleware"
	"github.com/photoplaces/backend/internal/models"
	"github.com/photoplaces/backend/internal/repository"
	"github.com/photoplaces/backend/internal/validator"
)

type BookingHandler struct {
	bookingRepo *repository.BookingRepo
	placeRepo   *repository.PlaceRepo
}

func NewBookingHandler(bookingRepo *repository.BookingRepo, placeRepo *repository.PlaceRepo) *BookingHandler {
	return &BookingHandler{bookingRepo: bookingRepo, placeRepo: placeRepo}
}

type createBookingRequest struct {
	PlaceID   string  `json:"place_id" validate:"required,uuid"`
	StartTime string  `json:"start_time" validate:"required,datetime=2006-01-02T15:04:05Z07:00"`
	EndTime   string  `json:"end_time" validate:"required,datetime=2006-01-02T15:04:05Z07:00"`
	Comment   *string `json:"comment" validate:"omitempty,max=1000"`
}

func (h *BookingHandler) Create(w http.ResponseWriter, r *http.Request) {
	userID := middleware.GetUserID(r.Context())

	var req createBookingRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}

	if err := validator.Validate(req); err != nil {
		writeValidationError(w, err)
		return
	}

	start, _ := time.Parse(time.RFC3339, req.StartTime)
	end, _ := time.Parse(time.RFC3339, req.EndTime)

	if !end.After(start) {
		writeError(w, http.StatusBadRequest, "end_time must be after start_time")
		return
	}

	available, err := h.bookingRepo.IsTimeSlotAvailable(r.Context(), req.PlaceID, start, end)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	if !available {
		writeError(w, http.StatusConflict, "time slot is not available")
		return
	}

	totalPrice, err := h.bookingRepo.CalculateTotalPrice(r.Context(), req.PlaceID, start, end)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	booking := &models.Booking{
		PlaceID:    req.PlaceID,
		UserID:     userID,
		StartTime:  start,
		EndTime:    end,
		TotalPrice: totalPrice,
		Currency:   "RUB",
		Comment:    strPtr(req.Comment),
	}

	if err := h.bookingRepo.Create(r.Context(), booking); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	writeJSON(w, http.StatusCreated, booking)
}

func (h *BookingHandler) ListMy(w http.ResponseWriter, r *http.Request) {
	userID := middleware.GetUserID(r.Context())

	bookings, err := h.bookingRepo.ListByUser(r.Context(), userID)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	if bookings == nil {
		bookings = []*models.Booking{}
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{"data": bookings})
}

func (h *BookingHandler) Cancel(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	userID := middleware.GetUserID(r.Context())

	booking, err := h.bookingRepo.GetByID(r.Context(), id)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	if booking == nil {
		writeError(w, http.StatusNotFound, "booking not found")
		return
	}
	if booking.UserID != userID {
		writeError(w, http.StatusForbidden, "not your booking")
		return
	}

	if err := h.bookingRepo.UpdateStatus(r.Context(), id, "cancelled"); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "cancelled"})
}

func (h *BookingHandler) Confirm(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")

	if err := h.bookingRepo.UpdateStatus(r.Context(), id, "confirmed"); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "confirmed"})
}