package web

import (
	"net/http"
	"time"

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

// The missed-backup banner (R-871, `09` decision 110 — the operator's idea). The rule is the pure
// nightchain.ComputeBanner; this file only gathers its inputs and renders. It hangs off executeTemplate like the
// escrow bar (R-543), so it reaches every dashboard page of a logged-in household. Unlike that bar its dismissal is
// DURABLE (the night ledger): closed until the NEXT missed backup time, gone by itself after a successful night.

// SetMissedBackupBanner wires the night ledger and the metrics record (nil ledger = no banner: backups off).
func (s *Server) SetMissedBackupBanner(l *nightchain.Ledger, ms *metrics.MetricsStore) {
	s.nightLedger, s.metricsRecord = l, ms
}

// missedBackupBanner computes the banner for now (nil = nothing to show).
func (s *Server) missedBackupBanner(now time.Time) *nightchain.Banner {
	if s.nightLedger == nil || s.settings == nil {
		return nil
	}
	loc := budapestLocation()
	seeded, dumpOK, _, dismissed, _ := s.nightLedger.Snapshot()
	in := nightchain.BannerInput{
		Now: now, Window: s.effectiveBackupWindow(), Loc: loc,
		SeededAt: seeded, DBDumpOK: dumpOK, Dismissed: dismissed,
	}
	if s.backupMgr != nil && s.backupMgr.OffboxConfigured() {
		if t := s.settings.GetOffboxTarget(); t != nil && t.Enabled {
			in.OffsiteConfigured = true
			if ok, err := time.Parse(time.RFC3339, t.LastSuccess); err == nil {
				in.OffsiteOK = ok
			}
		}
	}
	if s.metricsRecord != nil {
		ms := s.metricsRecord
		in.OnAtW = func(w time.Time) (bool, bool) {
			n, err := ms.SampleCount(w.Add(-5*time.Minute), w.Add(5*time.Minute))
			if err != nil {
				return false, false
			}
			return n > 0, true
		}
		if counts, err := ms.HourSampleCounts(now.Add(-7*24*time.Hour), now); err == nil {
			h := nightchain.HourDaysFrom(counts, loc)
			in.Hours = &h
		}
	}
	b := nightchain.ComputeBanner(in)
	if !b.Show {
		return nil
	}
	return &b
}

// addMissedBackupBanner is called from executeTemplate for every authenticated page.
func (s *Server) addMissedBackupBanner(data map[string]interface{}, r *http.Request) {
	if data == nil || r == nil || !s.hasAdminSession(r) {
		return
	}
	b := s.missedBackupBanner(time.Now())
	if b == nil {
		return
	}
	lang := s.langFor(r)
	msg := s.i18n.Msg(lang, "banner.missed_backup.never")
	if !b.LastBackup.IsZero() {
		msg = s.i18n.Msgf(lang, "banner.missed_backup.last", b.DaysAgo)
	}
	if b.OffAt != "" {
		msg += " " + s.i18n.Msgf(lang, "banner.missed_backup.off_at", b.OffAt)
	}
	hint := s.i18n.Msg(lang, "banner.missed_backup.choose")
	if b.Suggest != "" {
		hint = s.i18n.Msgf(lang, "banner.missed_backup.suggest", b.Suggest)
	}
	data["MissedBackupBanner"] = true
	data["MissedBackupMessage"] = msg
	data["MissedBackupHint"] = hint
	data["MissedBackupBack"] = r.URL.Path
	if data["CSRFField"] == nil {
		data["CSRFField"] = s.csrfField(r)
	}
	if s.isDebug() {
		s.logger.Printf("[DEBUG] [web] missed-backup banner: rendered on %s (last=%s off_at=%q suggest=%q)", r.URL.Path,
			b.LastBackup.Format(time.RFC3339), b.OffAt, b.Suggest)
	}
}

// missedBackupBannerDismissHandler (POST /backups/missed-banner/dismiss) closes the banner until the NEXT missed
// backup time — durable, in the night ledger.
func (s *Server) missedBackupBannerDismissHandler(w http.ResponseWriter, r *http.Request) {
	if b := s.missedBackupBanner(time.Now()); b != nil && s.nightLedger != nil {
		s.nightLedger.DismissBanner(b.MissedAt)
		s.logger.Printf("[INFO] [web] missed-backup banner: closed by the household until the next missed backup time (after %s)",
			b.MissedAt.Format(time.RFC3339))
	}
	http.Redirect(w, r, redirectBackTo(r, "/launcher"), http.StatusFound)
}

// budapestLocation is the backup window's clock.
func budapestLocation() *time.Location {
	loc, err := time.LoadLocation("Europe/Budapest")
	if err != nil {
		return time.Local
	}
	return loc
}