package main

import (
	"fmt"
	"os"
	"strings"

	"github.com/joho/godotenv"
)

type Config struct {
	Port           string
	DatabaseURL    string
	StorageDir     string
	DevMode        bool
	OIDCIssuer     string
	OIDCAudience   string
	OIDCJWKSURL    string
	OIDCAuthURL    string
	OIDCTokenURL   string
	OIDCClientID   string
	OIDCClientSecret string
	OIDCRedirect   string
	OIDCLogoutURL  string
}

func LoadConfig() (Config, error) {
	_ = godotenv.Load()

	cfg := Config{
		Port:          envOrDefault("PORT", "8080"),
		DatabaseURL:   os.Getenv("DATABASE_URL"),
		StorageDir:    envOrDefault("STORAGE_DIR", "uploads"),
		DevMode:       strings.EqualFold(envOrDefault("DEV_MODE", "false"), "true"),
		OIDCIssuer:    os.Getenv("OIDC_ISSUER"),
		OIDCAudience:  os.Getenv("OIDC_AUDIENCE"),
		OIDCJWKSURL:   os.Getenv("OIDC_JWKS_URL"),
		OIDCAuthURL:   os.Getenv("OIDC_AUTH_URL"),
		OIDCTokenURL:  os.Getenv("OIDC_TOKEN_URL"),
		OIDCClientID:  os.Getenv("OIDC_CLIENT_ID"),
		OIDCClientSecret: os.Getenv("OIDC_CLIENT_SECRET"),
		OIDCRedirect:  os.Getenv("OIDC_REDIRECT_URL"),
		OIDCLogoutURL: os.Getenv("OIDC_LOGOUT_URL"),
	}

	if cfg.DatabaseURL == "" {
		return Config{}, fmt.Errorf("DATABASE_URL is required")
	}
	if !cfg.DevMode && (cfg.OIDCIssuer == "" || cfg.OIDCAudience == "" || cfg.OIDCJWKSURL == "") {
		return Config{}, fmt.Errorf("OIDC_ISSUER, OIDC_AUDIENCE, and OIDC_JWKS_URL are required")
	}
	if !cfg.DevMode && (cfg.OIDCAuthURL == "" || cfg.OIDCTokenURL == "" || cfg.OIDCClientID == "" || cfg.OIDCClientSecret == "" || cfg.OIDCRedirect == "") {
		return Config{}, fmt.Errorf("OIDC_AUTH_URL, OIDC_TOKEN_URL, OIDC_CLIENT_ID, OIDC_CLIENT_SECRET, and OIDC_REDIRECT_URL are required when DEV_MODE=false")
	}
	return cfg, nil
}

func envOrDefault(key, fallback string) string {
	value := os.Getenv(key)
	if value == "" {
		return fallback
	}
	return value
}