package parser

import (
	"strings"
	"time"

	"github.com/erizocosmico/go-ics"
)

type Lesson struct {
	Number    string
	TimeStart time.Time
	TimeMsg   string
	Name      string
	User      string
	Place     string
}

func ParseByDay(day string) []Lesson {
	return selectLessonsByDay(parse(), day)
}

func parse() []Lesson {
	link := "https://www.asu.ru/timetable/students/12/2129440415/?file=2129440415.ics"
	calendar, err := ics.ParseCalendar(link, 0, nil)
	if err != nil {
		panic(err)
	}

	var lessons []Lesson
	for _, event := range calendar.Events {
		l := Lesson{
			Number:    "",
			TimeStart: event.Start,
            TimeMsg:   event.Start.Format("15:04") + " - " + event.End.Format("15:04"),
			Name:      event.Summary,
			User:      event.Description,
			Place:     event.Location,
		}
		if l.Place == "" {
			l.Place = "не приходи"
		}
		lessons = append(lessons, l)
	}
	return lessons
}

func selectLessonsByDay(schedule []Lesson, day string) []Lesson {
	var todayLessons []Lesson
	for _, l := range schedule {
		if day == "" || strings.Contains(l.TimeStart.String(), day) {
			todayLessons = append(todayLessons, l)
		}
	}
	return todayLessons
}