package recovery

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"time"

	"gitea.dooplex.hu/admin/felhom-controller/internal/i18n"
)

// Info holds the data needed for the recovery info file.
type Info struct {
	CustomerID        string
	RetrievalPassword string
	HubURL            string
	SupportEmail      string
	SupportURL        string
	// DashboardURL is the household's dashboard, e.g. https://felhom.<domain> (R-554, v0.308.0): the file
	// points at its Restore page and its „Adatok visszaszerzése" page, not at the deleted setup wizard.
	DashboardURL string
	// Lang is the box's language; the file is written in it (Hungarian when empty or unknown).
	Lang string
}

// recoveryInfoKey is the file's text in the bundle (hu.json / en.json), with ten %s, in order:
// customer id, hub URL, retrieval password, support e-mail, support web, dashboard, restore page,
// recovery page, generated-at, controller version.
const recoveryInfoKey = "recovery_info.body"

// Render returns the text of recovery-info.txt (R-554, `09` §3 decision 222): what to do when something must
// be restored — the dashboard's Backup → Restore page, and after a reinstall the recovery code on the
// „Adatok visszaszerzése" page. Pinned by TestRecoveryInfo_PointsAtDashboardNotWizard.
func Render(info Info, version string, now time.Time) (string, error) {
	b, err := i18n.Shared()
	if err != nil {
		return "", fmt.Errorf("loading message bundle: %w", err)
	}
	dash := strings.TrimRight(info.DashboardURL, "/")
	return b.Msgf(i18n.Normalize(info.Lang), recoveryInfoKey,
		info.CustomerID,
		info.HubURL,
		info.RetrievalPassword,
		info.SupportEmail,
		info.SupportURL,
		dash,
		dash+"/backups/restore",
		dash+"/recovery",
		now.Format("2006-01-02 15:04:05"),
		version,
	), nil
}

// GenerateRecoveryFile writes a plain text recovery-info.txt to the given directory (0600: it holds the
// retrieval password).
func GenerateRecoveryFile(info Info, version, outputDir string) error {
	if err := os.MkdirAll(outputDir, 0755); err != nil {
		return fmt.Errorf("creating recovery info directory: %w", err)
	}
	content, err := Render(info, version, time.Now())
	if err != nil {
		return err
	}

	path := filepath.Join(outputDir, "recovery-info.txt")
	tmp := path + ".tmp"
	if err := os.WriteFile(tmp, []byte(content), 0600); err != nil {
		os.Remove(tmp)
		return err
	}
	if err := os.Rename(tmp, path); err != nil {
		os.Remove(tmp)
		return err
	}
	return nil
}