package api

import (
	"net/http"
	"time"

	"git.coopgo.io/coopgo-apps/parcoursmob/services"
	ics "github.com/arran4/golang-ical"
	"github.com/gorilla/mux"
	"github.com/rs/zerolog/log"
)

func (h *APIHandler) icsCalendar(events []services.AgendaEvent) (*ics.Calendar, error) {
	calendar := ics.NewCalendarFor(h.config.GetString("service_name"))

	for _, e := range events {
		vevent := ics.NewEvent(e.ID)
		vevent.SetSummary(e.Name)
		vevent.SetDescription(e.Description)
		if e.Allday {
			vevent.SetAllDayStartAt(e.Startdate)
			if e.Enddate.After(e.Startdate) {
				vevent.SetAllDayEndAt(e.Enddate.Add(24 * time.Hour))
			}
		} else {
			timeloc, err := time.LoadLocation("Europe/Paris")
			if err != nil {
				log.Error().Err(err).Msg("Tried to load timezone location Europe/Paris. Error. Missing zones in container ?")
				return nil, err
			}

			starttime, err := time.ParseInLocation("15:04", e.Starttime, timeloc)
			if err != nil {
				return nil, err
			}
			startdatetime := time.Date(e.Startdate.Year(), e.Startdate.Month(), e.Startdate.Day(), starttime.Hour(), starttime.Minute(), 0, 0, timeloc)

			endtime, err := time.Parse("15:04", e.Endtime)
			if err != nil {
				return nil, err
			}
			enddatetime := time.Date(e.Enddate.Year(), e.Enddate.Month(), e.Enddate.Day(), endtime.Hour(), endtime.Minute(), 0, 0, timeloc)

			vevent.SetStartAt(startdatetime)
			vevent.SetEndAt(enddatetime)
		}
		calendar.AddVEvent(vevent)
	}
	return calendar, nil
}

func (h *APIHandler) CalendarGlobal(w http.ResponseWriter, r *http.Request) {
	enabled := h.config.GetBool("modules.agenda.enabled") && h.config.GetBool("modules.agenda.calendars.global.enabled")
	if !enabled {
		log.Error().Msg("global calendar not activated in configuration")
		w.WriteHeader(http.StatusForbidden)
		return
	}

	events, err := h.services.GetAgendaEvents()
	if err != nil {
		log.Error().Err(err).Msg("error retrieving agenda events")
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	calendar, err := h.icsCalendar(events)
	if err != nil {
		log.Error().Err(err).Msg("error while creating ics calendar")
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusOK)
	w.Header().Set("Content-Type", "text/calendar")
	w.Write([]byte(calendar.Serialize()))
}

func (h *APIHandler) CalendarOrganizations(w http.ResponseWriter, r *http.Request) {
	enabled := h.config.GetBool("modules.agenda.enabled") && h.config.GetBool("modules.agenda.calendars.organizations.enabled")
	if !enabled {
		log.Error().Msg("organizations calendar not activated in configuration")
		w.WriteHeader(http.StatusForbidden)
		return
	}

	// TODO set additional calendar rights in group configuration to prevent default behavior ?

	vars := mux.Vars(r)
	groupid := vars["groupid"]

	events, err := h.services.GetAgendaEvents()
	if err != nil {
		log.Error().Err(err).Msg("error retrieving agenda events")
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	filteredEvents := []services.AgendaEvent{}

	for _, e := range events {
		for _, g := range e.Owners {
			log.Debug().Str("groupid", groupid).Str("g", g).Msg("check identical")
			if g == groupid {
				filteredEvents = append(filteredEvents, e)
				continue
			}
		}
	}

	calendar, err := h.icsCalendar(filteredEvents)
	if err != nil {
		log.Error().Err(err).Msg("error while creating ics calendar")
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusOK)
	w.Header().Set("Content-Type", "text/calendar")
	w.Write([]byte(calendar.Serialize()))
}