//go:build linux || freebsd
// +build linux freebsd

package core

import (
	"time"
)

// TimeoutConfig configures smart timeout
type TimeoutConfig struct {
	Min                 time.Duration
	Max                 time.Duration
	MinSpeedBytesPerSec int64
	SafetyFactor        float64
	DefaultUnknown      time.Duration
}

// DefaultTimeoutConfig returns default settings
func DefaultTimeoutConfig() *TimeoutConfig {
	return &TimeoutConfig{
		Min:                 30 * time.Second,
		Max:                 24 * time.Hour,
		MinSpeedBytesPerSec: 10 * 1024,
		SafetyFactor:        3.0,
		DefaultUnknown:      30 * time.Minute,
	}
}

// CalculateTimeout calculates the recommended timeout
func (tc *TimeoutConfig) CalculateTimeout(fileSize int64, userOverride time.Duration) time.Duration {
	if userOverride > 0 {
		return userOverride
	}
	if fileSize <= 0 {
		return tc.DefaultUnknown
	}
	expectedSeconds := float64(fileSize) / float64(tc.MinSpeedBytesPerSec)
	calculated := time.Duration(expectedSeconds * tc.SafetyFactor * float64(time.Second))
	if calculated < tc.Min {
		return tc.Min
	}
	if calculated > tc.Max {
		return tc.Max
	}
	return calculated
}