// Package config loads runtime configuration from environment variables.
package config

import (
	"os"
	"strconv"
)

const (
	AppVersion           = "1.0.0"
	DefaultEmptyResponse = "call this tool `get_user_request` again to fetch latest user input..."
)

// Config holds all runtime configuration values for local-mcp.
type Config struct {
	Host                   string
	HTTPPort               string
	DBPath                 string
	LogLevel               string
	DefaultWaitSeconds     int
	AgentStaleAfterSeconds int
	MCPStateless           bool
	APIToken               string
}

// Load reads configuration from environment variables with sensible defaults.
func Load() Config {
	return Config{
		Host:                   getEnv("HOST", "0.0.0.0"),
		HTTPPort:               getEnv("HTTP_PORT", "8000"),
		DBPath:                 getEnv("DB_PATH", "data/local_mcp.sqlite3"),
		LogLevel:               getEnv("LOG_LEVEL", "INFO"),
		DefaultWaitSeconds:     getEnvInt("DEFAULT_WAIT_SECONDS", 10),
		AgentStaleAfterSeconds: getEnvInt("AGENT_STALE_AFTER_SECONDS", 30),
		MCPStateless:           getEnvBool("MCP_STATELESS", true),
		APIToken:               getEnv("API_TOKEN", ""),
	}
}

func getEnv(key, defaultVal string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return defaultVal
}

func getEnvInt(key string, defaultVal int) int {
	if v := os.Getenv(key); v != "" {
		if i, err := strconv.Atoi(v); err == nil {
			return i
		}
	}
	return defaultVal
}

func getEnvBool(key string, defaultVal bool) bool {
	if v := os.Getenv(key); v != "" {
		if b, err := strconv.ParseBool(v); err == nil {
			return b
		}
	}
	return defaultVal
}