package main

import (
	"fmt"
	"os"
	"strconv"
	"strings"

	"gardomatic.kleiax.de/internal/mailer"
)

type config struct {
	dsn              string
	environment      string
	webBaseURL       string
	demoResetEnabled bool
	json             bool
	yes              bool
	mail             mailer.Config
}

func configFromEnvironment() (config, error) {
	port, err := envInt("GARDOMATIC_SMTP_PORT", 25)
	if err != nil {
		return config{}, err
	}
	demoResetEnabled, err := envBool("GARDOMATIC_DEMO_RESET_ENABLED", false)
	if err != nil {
		return config{}, err
	}

	return config{
		dsn:              os.Getenv("GARDOMATIC_DB_DSN"),
		environment:      envString("GARDOMATIC_ENV", "development"),
		webBaseURL:       envString("GARDOMATIC_WEB_BASE_URL", "http://localhost:4040"),
		demoResetEnabled: demoResetEnabled,
		mail: mailer.Config{
			Mode:     mailer.Mode(envString("GARDOMATIC_SMTP_MODE", string(mailer.ModeFile))),
			Host:     os.Getenv("GARDOMATIC_SMTP_HOST"),
			Port:     port,
			Username: os.Getenv("GARDOMATIC_SMTP_USERNAME"),
			Password: os.Getenv("GARDOMATIC_SMTP_PASSWORD"),
			Sender:   envString("GARDOMATIC_SMTP_SENDER", "gardomatic@localhost"),
			FilePath: envString("GARDOMATIC_SMTP_FILE_PATH", "/tmp/gardomatic-mails.log"),
		},
	}, nil
}

func envBool(name string, fallback bool) (bool, error) {
	value := strings.TrimSpace(os.Getenv(name))
	if value == "" {
		return fallback, nil
	}
	b, err := strconv.ParseBool(value)
	if err != nil {
		return false, fmt.Errorf("%s must be a boolean: %w", name, err)
	}
	return b, nil
}

func envString(name, fallback string) string {
	if value := strings.TrimSpace(os.Getenv(name)); value != "" {
		return value
	}
	return fallback
}

func envInt(name string, fallback int) (int, error) {
	value := strings.TrimSpace(os.Getenv(name))
	if value == "" {
		return fallback, nil
	}

	n, err := strconv.Atoi(value)
	if err != nil {
		return 0, fmt.Errorf("%s must be an integer: %w", name, err)
	}
	return n, nil
}