package calendar

import (
	"log/slog"
	"net/http"

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

	"github.com/ultisuite/ulti-backend/internal/api/apiresponse"
	"github.com/ultisuite/ulti-backend/internal/api/apivalidate"
	"github.com/ultisuite/ulti-backend/internal/api/middleware"
	"github.com/ultisuite/ulti-backend/internal/api/query"
	"github.com/ultisuite/ulti-backend/internal/nextcloud"
	"github.com/ultisuite/ulti-backend/internal/permission"
)

type Handler struct {
	svc    *Service
	logger *slog.Logger
}

func NewHandler(nc *nextcloud.Client) *Handler {
	return &Handler{
		svc:    NewService(nc),
		logger: slog.Default().With("component", "calendar-api"),
	}
}

func (h *Handler) Routes() chi.Router {
	r := chi.NewRouter()
	read := middleware.RequirePermission(permission.ResourceCalendar, permission.LevelRead)
	write := middleware.RequirePermission(permission.ResourceCalendar, permission.LevelWrite)

	r.With(read).Get("/", h.ListCalendars)
	r.With(read).Get("/{calID}/events", h.ListEvents)
	r.With(write).Post("/{calID}/events", h.CreateEvent)
	r.With(write).Delete("/events/*", h.DeleteEvent)
	return r
}

func (h *Handler) ListCalendars(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	cals, err := h.svc.ListCalendars(r.Context(), claims.Sub)
	if err != nil {
		h.logger.Error("list calendars", "error", err)
		apivalidate.WriteInternal(w, r)
		return
	}
	apiresponse.WriteJSON(w, http.StatusOK, map[string]any{"calendars": cals})
}

func (h *Handler) ListEvents(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	params, err := query.ParseListRequest(r)
	if err != nil {
		apivalidate.WriteQueryError(w, r, err)
		return
	}

	result, err := h.svc.ListEvents(r.Context(), claims.Sub, chi.URLParam(r, "calID"), params)
	if err != nil {
		h.logger.Error("list events", "error", err)
		apivalidate.WriteInternal(w, r)
		return
	}
	apiresponse.WriteJSON(w, http.StatusOK, result)
}

func (h *Handler) CreateEvent(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())

	var event nextcloud.Event
	if err := apivalidate.DecodeJSON(w, r, maxRequestBody, &event); err != nil {
		return
	}
	if verr := validateCreateEvent(&event); verr != nil {
		apivalidate.WriteValidationError(w, r, verr)
		return
	}

	if err := h.svc.CreateEvent(r.Context(), claims.Sub, chi.URLParam(r, "calID"), &event); err != nil {
		h.logger.Error("create event", "error", err)
		apivalidate.WriteInternal(w, r)
		return
	}
	w.WriteHeader(http.StatusCreated)
}

func (h *Handler) DeleteEvent(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	eventPath := chi.URLParam(r, "*")
	if verr := validateDeletePath(eventPath); verr != nil {
		apivalidate.WriteValidationError(w, r, verr)
		return
	}
	if err := h.svc.DeleteEvent(r.Context(), claims.Sub, eventPath); err != nil {
		h.logger.Error("delete event", "error", err)
		apivalidate.WriteInternal(w, r)
		return
	}
	w.WriteHeader(http.StatusNoContent)
}