// package config handles server configuration from environment variables.
package config

import (
	"fmt"
	"os"
	"strconv"
)

// Config holds all server configuration.
type Config struct {
	// HTTP
	Port int `json:"port"`

	// Database
	DatabaseURL string `json:"database_url"`

	// Storage
	CASDir   string `json:"cas_dir"`   // Content-Addressable Storage root
	SkinsDir string `json:"skins_dir"` // Uploaded skins

	// Auth
	JWTSecret string `json:"jwt_secret"`
	CIsecret  string `json:"ci_secret"` // Token for CI/CD launcher release endpoint

	// Public
	BaseURL string `json:"base_url"` // External URL for CDN links
}

// Load reads configuration from environment variables with sensible defaults.
func Load() (*Config, error) {
	port, err := strconv.Atoi(getEnv("SERVER_PORT", "8080"))
	if err != nil {
		return nil, fmt.Errorf("invalid SERVER_PORT: %w", err)
	}

	cfg := &Config{
		Port:        port,
		DatabaseURL: getEnv("DATABASE_URL", ""),
		CASDir:      getEnv("CAS_DIR", "/var/www/cdn/files"),
		SkinsDir:    getEnv("SKINS_DIR", "/var/www/cdn/skins"),
		JWTSecret:   getEnv("JWT_SECRET", ""),
		CIsecret:    getEnv("CI_SECRET", ""),
		BaseURL:     getEnv("BASE_URL", "https://minecraft.mrixs.me"),
	}

	if cfg.DatabaseURL == "" {
		return nil, fmt.Errorf("DATABASE_URL is required")
	}
	if cfg.JWTSecret == "" {
		return nil, fmt.Errorf("JWT_SECRET is required")
	}

	return cfg, nil
}

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