package config

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

type DatabaseConfig struct {
	Host     string
	Port     int
	Name     string
	User     string
	Password string
}

func loadDatabase(env string) (DatabaseConfig, error) {
	if os.Getenv("DATABASE_HOST") != "" {
		return databaseFromEnv()
	}

	switch env {
	case "production":
		return DatabaseConfig{
			Host:     "database-1.chmuueamo72p.eu-central-1.rds.amazonaws.com",
			Port:     3306,
			Name:     "audio",
			User:     "root",
			Password: os.Getenv("DATABASE_PASSWORD"),
		}, nil
	default:
		return DatabaseConfig{
			Host:     "localhost",
			Port:     3306,
			Name:     "audio",
			User:     "root",
			Password: "root123",
		}, nil
	}
}

func databaseFromEnv() (DatabaseConfig, error) {
	port, err := strconv.Atoi(getEnv("DATABASE_PORT", "3306"))
	if err != nil {
		return DatabaseConfig{}, fmt.Errorf("invalid DATABASE_PORT: %w", err)
	}

	return DatabaseConfig{
		Host:     os.Getenv("DATABASE_HOST"),
		Port:     port,
		Name:     getEnv("DATABASE_NAME", "audio"),
		User:     getEnv("DATABASE_USER", "root"),
		Password: os.Getenv("DATABASE_PASSWORD"),
	}, nil
}

func (d DatabaseConfig) validate(env string) error {
	if d.Host == "" {
		return fmt.Errorf("database host is required")
	}
	if d.Name == "" {
		return fmt.Errorf("database name is required")
	}
	if d.User == "" {
		return fmt.Errorf("database user is required")
	}
	if env == "production" && d.Password == "" {
		return fmt.Errorf("DATABASE_PASSWORD is required in production")
	}
	return nil
}