package ical

import (
	"bytes"
	"github.com/jordic/goics"
	"htwkalender-ical/model"
	"htwkalender-ical/service/connector"
	"time"
)

const expirationTime = 5 * time.Minute

func Feed(token string) (string, error) {
	// get feed by token
	feed, err := connector.GetFeedByToken(token)
	if err != nil {
		return "", err
	}

	var events model.Events

	for _, module := range feed.Modules {
		moduleWithEvents, err := connector.GetModuleWithEvents(module)
		if err != nil {
			return "", err
		}

		events = append(events, moduleWithEvents.Events...)
	}

	// Sorte events by start date
	events.Sort()

	modules := make(map[string]model.FeedCollection)
	for _, module := range feed.Modules {
		modules[module.UUID] = model.FeedCollection(module)
	}

	b := bytes.Buffer{}
	goics.NewICalEncode(&b).Encode(IcalModel{Events: events, Mapping: modules})
	icalFeed := &model.FeedModel{Content: b.String(), ExpiresAt: model.JSONTime(time.Now().Add(expirationTime))}

	return icalFeed.Content, nil
}

func FeedRecord(token string) (model.FeedRecord, error) {

	feedRecord, err := connector.GetFeedByToken(token)
	if err != nil {
		return model.FeedRecord{}, err
	}

	return feedRecord, nil

}