package main

import (
	"errors"
	"fmt"
	"net/url"
	"strings"

	"gardomatic.kleiax.de/internal/platform/environment"
	"gardomatic.kleiax.de/internal/platform/validate"
	"gardomatic.kleiax.de/internal/storage"
	"gardomatic.kleiax.de/internal/web"
)

func configFromEnvironment() (web.Config, error) {
	port, err := environment.Int("GARDOMATIC_WEB_PORT", 4040)
	if err != nil {
		return web.Config{}, err
	}
	cookieSecure, err := environment.Bool("GARDOMATIC_COOKIE_SECURE", false)
	if err != nil {
		return web.Config{}, err
	}
	cfg := web.Config{Host: environment.String("GARDOMATIC_WEB_HOST", ""), Port: port, Env: environment.String("GARDOMATIC_ENV", "development"), APIBaseURL: environment.String("GARDOMATIC_API_BASE_URL", "http://localhost:4000"), DemoAccountEmail: strings.ToLower(strings.TrimSpace(environment.String("GARDOMATIC_DEMO_ACCOUNT_EMAIL", ""))), SessionCookieName: environment.String("GARDOMATIC_SESSION_COOKIE_NAME", "gardomatic_session"), CookieSecure: cookieSecure}
	var errs []error
	if cfg.Port < 1 || cfg.Port > 65535 {
		errs = append(errs, errors.New("GARDOMATIC_WEB_PORT must be between 1 and 65535"))
	}
	parsed, parseErr := url.ParseRequestURI(cfg.APIBaseURL)
	if parseErr != nil || parsed.Scheme == "" || parsed.Host == "" {
		errs = append(errs, fmt.Errorf("GARDOMATIC_API_BASE_URL must be an absolute HTTP URL"))
	}
	if cfg.Env == "production" && !cfg.CookieSecure {
		errs = append(errs, errors.New("GARDOMATIC_COOKIE_SECURE must be true in production"))
	}
	if cfg.DemoAccountEmail != "" {
		v := validate.New()
		if storage.ValidateEmail(v, cfg.DemoAccountEmail); !v.Valid() {
			errs = append(errs, errors.New("GARDOMATIC_DEMO_ACCOUNT_EMAIL must be a valid email address"))
		}
	}
	return cfg, errors.Join(errs...)
}