package lobby

import (
	"fmt"
	"time"
)

// Config configures the matchmaking pool's robot substitution.
type Config struct {
	// RobotWait is how long an auto-match player waits for a human before a robot
	// is substituted. Sourced from BACKEND_LOBBY_ROBOT_WAIT.
	RobotWait time.Duration
	// ReaperInterval is how often the substitution reaper scans for over-waited
	// players. Sourced from BACKEND_LOBBY_REAPER_INTERVAL.
	ReaperInterval time.Duration
}

// DefaultConfig returns the matchmaking defaults: a 10-second wait
// (docs/ARCHITECTURE.md §7) scanned every second.
func DefaultConfig() Config {
	return Config{
		RobotWait:      10 * time.Second,
		ReaperInterval: time.Second,
	}
}

// Validate reports whether the configuration is usable.
func (c Config) Validate() error {
	if c.RobotWait <= 0 {
		return fmt.Errorf("lobby: robot wait must be positive, got %s", c.RobotWait)
	}
	if c.ReaperInterval <= 0 {
		return fmt.Errorf("lobby: reaper interval must be positive, got %s", c.ReaperInterval)
	}
	return nil
}