package config

import (
	"os"
	"strconv"
	"time"
)

type Config struct {
	StorageRoot   string
	IncomingDir   string
	ProcessingDir string
	FailedDir     string
	PollInterval  time.Duration
	StableWindow  time.Duration
	StableChecks  int
	RabbitURL     string
	Exchange      string
	RoutingKey    string
}

func Load() Config {
	return Config{
		StorageRoot:   getEnv("STORAGE_ROOT", "/data/storage"),
		IncomingDir:   getEnv("INCOMING_DIR", "incoming"),
		ProcessingDir: getEnv("PROCESSING_DIR", "processing"),
		FailedDir:     getEnv("FAILED_DIR", "failed"),
		PollInterval:  getDuration("POLL_INTERVAL", 5*time.Second),
		StableWindow:  getDuration("STABLE_WINDOW", 2*time.Second),
		StableChecks:  getInt("STABLE_CHECKS", 3),
		RabbitURL:     getEnv("RABBITMQ_URL", "amqp://guest:guest@localhost:5672/"),
		Exchange:      getEnv("RABBITMQ_EXCHANGE", "audio_pipeline"),
		RoutingKey:    getEnv("RABBITMQ_ROUTING_KEY", "audio.new"),
	}
}

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

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

func getDuration(key string, def time.Duration) time.Duration {
	if v := os.Getenv(key); v != "" {
		if d, err := time.ParseDuration(v); err == nil {
			return d
		}
	}
	return def
}