package dialoguectx

import (
	"os"
	"strconv"
	"strings"
)

// InjectionEnabled reports whether dialogue context injection is on.
// Default is on; set DIALOGUE_CTX_INJECTION=off|false|0 to disable urgently.
func InjectionEnabled() bool {
	v := strings.TrimSpace(strings.ToLower(os.Getenv("DIALOGUE_CTX_INJECTION")))
	switch v {
	case "off", "false", "0", "no":
		return false
	default:
		return true
	}
}

// MaxDaysFromEnv returns the configured day window (default 7, cap 31).
func MaxDaysFromEnv() int {
	return envInt("DIALOGUE_CTX_MAX_DAYS", DefaultMaxDays, 1, MaxDaysCap)
}

// MaxTurnsFromEnv returns the configured turn cap (default 80, cap 200).
func MaxTurnsFromEnv() int {
	return envInt("DIALOGUE_CTX_MAX_TURNS", DefaultMaxTurns, 1, MaxTurnsCap)
}

func envInt(key string, def, min, max int) int {
	raw := strings.TrimSpace(os.Getenv(key))
	if raw == "" {
		return def
	}
	n, err := strconv.Atoi(raw)
	if err != nil {
		return def
	}
	if n < min {
		return min
	}
	if n > max {
		return max
	}
	return n
}