package config

import (
	"bufio"
	"os"
	"strings"
)

type Config struct {
	DatabaseURL string
	JWTSecret   string
	RedisAddr   string
	ServerPort  string
	Env         string
	BaseURL     string
}

func Load() *Config {
	loadEnvFile(".env")

	port := getEnv("SERVER_PORT", "8080")
	return &Config{
		DatabaseURL: getEnv("DATABASE_URL", "postgres://postgres:postgres@localhost:5432/calendarapi?sslmode=disable"),
		JWTSecret:   getEnv("JWT_SECRET", "dev-secret-change-me"),
		RedisAddr:   os.Getenv("REDIS_ADDR"),
		ServerPort:  port,
		Env:         getEnv("ENV", "development"),
		BaseURL:     getEnv("BASE_URL", "http://localhost:"+port),
	}
}

func loadEnvFile(path string) {
	f, err := os.Open(path)
	if err != nil {
		return
	}
	defer f.Close()

	scanner := bufio.NewScanner(f)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		k, v, ok := strings.Cut(line, "=")
		if !ok {
			continue
		}
		k = strings.TrimSpace(k)
		v = strings.TrimSpace(v)
		if os.Getenv(k) == "" {
			os.Setenv(k, v)
		}
	}
}

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