package main

import (
	"log"

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

// R-1199 (rehearsal 2026-10-20) and R-1199 REOPENED (2026-10-22). A fresh box shows the household its DEFAULT
// notification list, but the hub mails only by its OWN stored list. v0.338.0 pushed that default at every start when
// nothing was saved on the box — and on a REBUILT box that overwrote the list the household had saved on its old box
// (demo-felhom, 07:54:55 UTC 2026-10-22: its own 13 events became the 17 defaults), again at every start, because the
// push created no local save. `08` „the household decides".
//
// Now, at start:
//   - a list saved on this box: as before (R-922 — re-pushed when it carries an address or a clear), as the household's;
//   - nothing saved here: READ the hub's list first. One the household saved (on any box) is ADOPTED as this box's
//     list — nothing is pushed; otherwise the box's default is pushed once, as a default, and saved here, so the next
//     start sends nothing. A hub that cannot be read (an older hub, no network) gets nothing; the next start asks again.
//
// The hub refuses a default over a household's list on its own side too (felhom.eu hub household_prefs.go), which also
// stops a box still on v0.338.0. Pinned by TestR1199Reopened_* (prefs_sync_wiring_test.go).

type prefsHub interface {
	FetchPreferences() (*notify.HubPrefs, error)
	SyncPreferencesAs(source, email string, enabledEvents []string, cooldownHours int, emailCleared bool) (string, error)
}

type prefsStore interface {
	GetNotificationPrefs() *settings.NotificationPrefs
	NotificationPrefsSaved() bool
	SetNotificationPrefs(*settings.NotificationPrefs) error
}

// startupPrefsSync runs the start-up step above and returns what it did (for the log and the tests): "pushed",
// "adopted", "default-pushed", "default-kept", "nothing", "no-hub" or "error".
func startupPrefsSync(hub prefsHub, st prefsStore, logger *log.Logger) string {
	logf := func(f string, a ...any) {
		if logger != nil {
			logger.Printf(f, a...)
		}
	}
	prefs := st.GetNotificationPrefs()
	if st.NotificationPrefsSaved() {
		if !prefs.SyncOnStartup() {
			return "nothing"
		}
		if _, err := hub.SyncPreferencesAs(notify.PrefsSourceHousehold, prefs.Email, prefs.EnabledEvents, prefs.CooldownHours, prefs.EmailCleared); err != nil {
			logf("[WARN] Failed to sync notification preferences on startup: %v", err)
			return "error"
		}
		return "pushed"
	}
	hp, err := hub.FetchPreferences()
	if err != nil {
		logf("[WARN] notification prefs: no list saved on this box and the hub's could not be read (%v) — nothing pushed; asked again at the next start (R-1199)", err)
		return "no-hub"
	}
	if hp.Exists && hp.HouseholdSaved {
		adopted := &settings.NotificationPrefs{Email: hp.Email, EnabledEvents: hp.EnabledEvents, CooldownHours: hp.CooldownHours}
		if adopted.EnabledEvents == nil {
			adopted.EnabledEvents = []string{}
		}
		if err := st.SetNotificationPrefs(adopted); err != nil {
			logf("[ERROR] notification prefs: adopting the household's list from the hub failed: %v", err)
			return "error"
		}
		logf("[INFO] notification prefs: adopted the household's saved list from the hub (%d events, address set=%t) — nothing pushed (R-1199)", len(adopted.EnabledEvents), adopted.Email != "")
		return "adopted"
	}
	status, err := hub.SyncPreferencesAs(notify.PrefsSourceDefault, "", prefs.EnabledEvents, prefs.CooldownHours, false)
	if err != nil {
		logf("[WARN] notification prefs: pushing the default list failed: %v", err)
		return "error"
	}
	if status == "kept" {
		logf("[INFO] notification prefs: the hub kept the household's own list over this box's default — adopted at the next start (R-1199)")
		return "default-kept"
	}
	local := &settings.NotificationPrefs{EnabledEvents: prefs.EnabledEvents, CooldownHours: prefs.CooldownHours}
	if err := st.SetNotificationPrefs(local); err != nil {
		logf("[ERROR] notification prefs: saving the pushed default on this box failed: %v", err)
		return "error"
	}
	logf("[INFO] notification prefs: no household list anywhere — pushed this box's default once and saved it here (R-1199)")
	return "default-pushed"
}