package main

import (
	"fmt"
	"io"
	"os"
	"time"

	"git.milar.in/milarin/channel"
	"git.milar.in/milarin/gmath"
)

func InitializeRunner() channel.Runner {
	if ThreadCount <= 0 {
		return channel.NewUnlimitedRunner()
	}
	return channel.NewLimitedRunner(ThreadCount)
}

func FormatBytes[T gmath.Integer](bytes T) string {
	value := float64(bytes)

	if value >= 1000000000000 {
		return fmt.Sprintf("%.02fT", value/1000000000000)
	} else if value >= 1000000000 {
		return fmt.Sprintf("%.02fG", value/1000000000)
	} else if value >= 1000000 {
		return fmt.Sprintf("%.02fM", value/1000000)
	} else if value >= 1000 {
		return fmt.Sprintf("%.02fK", value/1000)
	} else {
		return fmt.Sprintf("%.02fB", value)
	}
}

func PrintByteChan(w io.Writer, ch <-chan byte) error {
	for b := range ch {
		if _, err := w.Write([]byte{b}); err != nil {
			return err
		}
	}

	fmt.Fprintln(w)
	return nil
}

func PrintFileHandle(fh *FileHandle) {
	if err := PrintByteChan(os.Stdout, fh.Chan); err != nil {
		panic(err) // TODO error handling
	}
}

func WaitForNextTelegramSendCycle() {
	now := time.Now()
	_, offset := now.Zone()
	offsetDuration := time.Duration(offset) * time.Second
	lastCycle := now.Truncate(TelegramOrganizeMessageSendInterval).Add(-offsetDuration).Add(TelegramOrganizeMessageSendOffset)

	if durationUntilLastCycle := time.Until(lastCycle); durationUntilLastCycle > 0 {
		time.Sleep(durationUntilLastCycle)
	} else {
		nextCycle := lastCycle.Add(TelegramOrganizeMessageSendInterval)
		time.Sleep(time.Until(nextCycle))
	}
}