package config

import (
	"log"
	"os"
	"strconv"

	"github.com/joho/godotenv"
)

type Config struct {
	Port               string
	DBUrl              string
	JWTSecret          string
	AppURL             string // e.g. https://api.example.com - used for verification links in emails
	GoogleClientID     string
	GoogleClientSecret string
	GithubClientID     string
	GithubClientSecret string
	ClientCallbackURL  string
	RedisUrl           string

	// Avatar Settings
	AvatarHeight  int
	AvatarWidth   int
	AvatarQuality int
	AvatarFormat  string
	AvatarMode    string // cover, contain, resize

	// Email Settings
	EmailHost         string
	EmailPort         string
	EmailHostUser     string
	EmailHostPassword string
	EmailFrom         string
}

var AppConfig *Config

func LoadConfig() {
	err := godotenv.Load()
	if err != nil {
		log.Println("Warning: Error loading .env file, continuing with system env")
	}

	AppConfig = &Config{
		Port:               getEnv("PORT", "8080"),
		DBUrl:              getEnv("DB_URL", ""),
		JWTSecret:          getEnv("JWT_SECRET", "default_secret"),
		AppURL:             getEnv("APP_URL", "http://localhost:8080"),
		GoogleClientID:     getEnv("GOOGLE_CLIENT_ID", ""),
		GoogleClientSecret: getEnv("GOOGLE_CLIENT_SECRET", ""),
		GithubClientID:     getEnv("GITHUB_CLIENT_ID", ""),
		GithubClientSecret: getEnv("GITHUB_CLIENT_SECRET", ""),
		ClientCallbackURL:  getEnv("CLIENT_CALLBACK_URL", ""),
		RedisUrl:           getEnv("REDIS_URL", ""),

		// Avatar Defaults
		AvatarHeight:  getEnvAsInt("AVATAR_H", 0),    // Default 0 (auto)
		AvatarWidth:   getEnvAsInt("AVATAR_W", 800),  // Default 800
		AvatarQuality: getEnvAsInt("AVATAR_Q", 80),   // Default 80
		AvatarFormat:  getEnv("AVATAR_F", "webp"),    // Default webp
		AvatarMode:    getEnv("AVATAR_B", "contain"), // Default contain (Fit)

		// Email Settings
		EmailHost:         getEnv("EMAIL_HOST", "localhost"),
		EmailPort:         getEnv("EMAIL_PORT", "1025"),
		EmailHostUser:     getEnv("EMAIL_HOST_USER", ""),
		EmailHostPassword: getEnv("EMAIL_HOST_PASSWORD", ""),
		EmailFrom:         getEnv("EMAIL_FROM", "noreply@gauth.local"),
	}
}

func getEnv(key, fallback string) string {
	if value, exists := os.LookupEnv(key); exists {
		return value
	}
	return fallback
}

func getEnvAsInt(key string, fallback int) int {
	valueStr := getEnv(key, "")
	if valueStr == "" {
		return fallback
	}
	value, err := strconv.Atoi(valueStr)
	if err != nil {
		return fallback
	}
	return value
}