package models

import (
	"fmt"
	"time"
)

type WorkDay struct {
	Day       time.Time
	Bookings  []Booking
	workTime  time.Duration
	pauseTime time.Duration
}

// Gets the duration someone worked that day
func (d *WorkDay) GetWorkTime() time.Duration {
	var workTime, pauseTime time.Duration
	var lastBooking Booking
	for _, booking := range d.Bookings {
		if booking.CheckInOut%2 == 1 {
			if !lastBooking.Timestamp.IsZero() {
				pauseTime += booking.Timestamp.Sub(lastBooking.Timestamp)
			}
		} else {
			workTime += booking.Timestamp.Sub(lastBooking.Timestamp)
		}
		lastBooking = booking
	}
	// checks if booking is today and has no gehen yet, so the time since last kommen booking is added to workTime
	if d.Day.Day() == time.Now().Day() && len(d.Bookings)%2 == 1 {
		workTime += time.Since(lastBooking.Timestamp.Local())
	}

	if workTime > 6*time.Hour && pauseTime < 45*time.Minute {
		if workTime < 9*time.Hour && pauseTime < 30*time.Minute {
			diff := 30*time.Minute - pauseTime
			workTime -= diff
			pauseTime += diff
		} else if pauseTime < 45*time.Minute {
			diff := 45*time.Minute - pauseTime
			workTime -= diff
			pauseTime += diff
		}
	}
	d.workTime = workTime
	d.pauseTime = pauseTime
	return workTime
}

func formatDuration(d time.Duration) string {
	hours := int(d.Hours())
	minutes := int(d.Minutes()) % 60
	switch {
	case hours > 0:
		return fmt.Sprintf("%dh %dmin", hours, minutes)
	case minutes > 0:
		return fmt.Sprintf("%dmin", minutes)
	default:
		return ""
	}
}

// Converts duration to string and replaces 0s with in
//
// -> output xhxmin
func (d *WorkDay) GetWorkTimeString() (string, string) {
	workString := formatDuration(d.workTime)
	pauseString := formatDuration(d.pauseTime)
	return workString, pauseString
}

// returns bool wheter the workday was ended with an automatic logout
func (d *WorkDay) RequiresAction() bool {
	return d.Bookings[len(d.Bookings)-1].CheckInOut == 255
}

// returns a integer percentage of how much day has been worked of
func (d *WorkDay) GetWorkDayProgress(user User) uint8 {
	defaultWorkTime := time.Duration(user.Arbeitszeit * float32(time.Hour))
	progress := (d.workTime.Seconds() / defaultWorkTime.Seconds()) * 100
	return uint8(progress)
}