package web

// PBS DR datastore fill surfaces (v0.65.0, R-5): the Offsite "PBS DR" tab panel + the Dashboard PBS
// gauge. The web layer reads only the checker's cached snapshot (s.pbsdrBox) — it never polls ep0. The
// snapshot carries its own state (ok / unavailable / degraded) so the UI renders each honestly.

import (
	"time"

	"gitea.dooplex.hu/admin/felhom-hub/internal/monitor"
)

// pbsdrBoxView is the PBS-DR panel model.
type pbsdrBoxView struct {
	Configured  bool   // s.pbsdrBox wired (tenantsync client present)
	Pending     bool   // configured but the first poll hasn't landed yet
	State       string // ok | unavailable | degraded
	Unavailable bool   // endpoint script predates the usage op (≤ v1.1.0) — expected pre-update
	Degraded    bool   // last poll failed — values shown stale
	HasFill     bool   // numbers available (ok or degraded-with-last-known)
	CapacityStr string
	UsedStr     string
	FillPercent float64
	FillBand    string
	FetchedAt   time.Time
}

// pbsdrTile is the compact Dashboard PBS gauge: fill %, band-colored; "n/a" when unavailable.
type pbsdrTile struct {
	Unavailable bool
	FillPercent float64
	Band        string
	Degraded    bool
}

// pbsdrBoxData builds the PBS-DR panel view. Nil provider → Configured:false ("not configured"). Never polls.
func (s *Server) pbsdrBoxData() pbsdrBoxView {
	if s.pbsdrBox == nil {
		return pbsdrBoxView{Configured: false}
	}
	view := pbsdrBoxView{Configured: true}
	snap, ok := s.pbsdrBox()
	if !ok {
		view.Pending = true // configured, first poll pending
		return view
	}
	view.State = snap.State
	view.FetchedAt = snap.FetchedAt
	switch snap.State {
	case monitor.PBSStateUnavailable:
		view.Unavailable = true
	case monitor.PBSStateDegraded:
		view.Degraded = true
		if snap.CapacityBytes > 0 { // last-known values persist across a degraded poll
			view.HasFill = true
			view.CapacityStr = fmtBytesGB(snap.CapacityBytes)
			view.UsedStr = fmtBytesGB(snap.UsedBytes)
			view.FillPercent = snap.FillPercent
			view.FillBand = snap.FillBand
		}
	default: // ok
		view.HasFill = true
		view.CapacityStr = fmtBytesGB(snap.CapacityBytes)
		view.UsedStr = fmtBytesGB(snap.UsedBytes)
		view.FillPercent = snap.FillPercent
		view.FillBand = snap.FillBand
	}
	return view
}

// pbsdrBoxTile builds the Dashboard PBS gauge, or nil when there is nothing to show (no provider, or the
// first poll hasn't landed). Unavailable → a neutral "n/a" gauge (never a fake 0%).
func (s *Server) pbsdrBoxTile() *pbsdrTile {
	if s.pbsdrBox == nil {
		return nil
	}
	snap, ok := s.pbsdrBox()
	if !ok {
		return nil
	}
	if snap.State == monitor.PBSStateUnavailable {
		return &pbsdrTile{Unavailable: true}
	}
	return &pbsdrTile{
		FillPercent: snap.FillPercent,
		Band:        snap.FillBand,
		Degraded:    snap.State == monitor.PBSStateDegraded,
	}
}