package config

import (
	"os"
	"strconv"

	"github.com/joho/godotenv"
)

// Config holds runtime configuration
type Config struct {
	S3Bucket    string `json:"s3Bucket"`
	LocalDest   string `json:"localDest"`
	AWSProfile  string `json:"awsProfile"`
	Concurrency int    `json:"concurrency"`
}

// Load reads config from ENV (with optional .env file)
func Load(envFile string) Config {
	_ = godotenv.Load(envFile) // ignore if missing

	concurrency := 4
	if v := os.Getenv("FIELD_SYNC_CONCURRENCY"); v != "" {
		if n, err := strconv.Atoi(v); err == nil && n > 0 {
			concurrency = n
		}
	}

	return Config{
		S3Bucket:    getenv("FIELD_SYNC_S3_BUCKET", ""),
		LocalDest:   getenv("FIELD_SYNC_LOCAL_DEST", os.TempDir()),
		AWSProfile:  getenv("AWS_PROFILE", "cosma"),
		Concurrency: concurrency,
	}
}

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