package main

import (
	"errors"
	"math"
	"strconv"
	"strings"
)

// DurationStrToMilliseconds converts a duration string (HH:MM:SS) to milliseconds for Cue points.
func DurationStrToMilliseconds(durationStr string) (float64, error) {
	parts := strings.Split(durationStr, ":")
	if len(parts) != 3 {
		return 0, errors.New("invalid duration string format")
	}

	hours, err := strconv.Atoi(parts[0])
	if err != nil {
		return 0, err
	}

	minutes, err := strconv.Atoi(parts[1])
	if err != nil {
		return 0, err
	}

	seconds, err := strconv.ParseFloat(parts[2], 64)
	if err != nil {
		return 0, err
	}

	return float64((hours*3600+minutes*60)+int(math.Round(seconds))) * 1000, nil
}