package localapi

import (
	"context"
	"testing"
)

// R-1344 (operator brief 2026-10-29, Part 2): a controller that RUNS but whose Docker health check reads „unhealthy" on
// controllerUnresponsiveConfirm consecutive sweeps is reported unresponsive (the stanza; the hub raises
// controller_unresponsive). ALARM ONLY: it is never restarted for it until the measurement licenses that.
// RED-PROOF: seen failing before the stanza carried it.

func unrespServer(t *testing.T, health string) (*Server, *opExec, *fakeGuestPowerCtl) {
	t.Helper()
	s, ex, ctl, _, _, _ := opServer(t, "running")
	ex.health = health
	return s, ex, ctl
}

func sweep(s *Server, n int) {
	for i := 0; i < n; i++ {
		s.ControllerSupervisorTick(context.Background())
	}
}

func TestSupervisor_UnresponsiveIsAlarmedNeverRestarted(t *testing.T) {
	s, ex, _ := unrespServer(t, "unhealthy")
	sweep(s, controllerUnresponsiveConfirm-1)
	if g := s.ControllerSupervisorStatus(context.Background()).Guests; len(g) != 1 || g[0].Unresponsive {
		t.Fatalf("unresponsive before %d sweeps: %+v", controllerUnresponsiveConfirm, g)
	}
	sweep(s, 1)
	g := s.ControllerSupervisorStatus(context.Background()).Guests
	if len(g) != 1 || !g[0].Unresponsive || g[0].UnresponsiveSince == "" {
		t.Fatalf("after %d unhealthy sweeps: %+v", controllerUnresponsiveConfirm, g)
	}
	since := g[0].UnresponsiveSince
	sweep(s, 10)
	if n := ex.count(9201); n != 0 {
		t.Fatalf("an unresponsive controller was RESTARTED (%d) — the restart waits for the measurement", n)
	}
	if g := s.ControllerSupervisorStatus(context.Background()).Guests; g[0].UnresponsiveSince != since {
		t.Fatal("unresponsive_since moved while it stayed unresponsive — the hub would mail again")
	}
	// it answers again
	ex.health = "healthy"
	sweep(s, 1)
	if g := s.ControllerSupervisorStatus(context.Background()).Guests; g[0].Unresponsive || g[0].UnresponsiveSince != since {
		t.Fatalf("after it answered: %+v (unresponsive must clear; since stays as the record)", g[0])
	}
}

// Slow but answering (healthy / starting), a swap, a vzdump or a parked guest never counts.
func TestSupervisor_UnresponsiveGuards(t *testing.T) {
	for _, tc := range []struct {
		name  string
		setup func(s *Server, ex *opExec, ctl *fakeGuestPowerCtl)
	}{
		{"healthy", func(_ *Server, ex *opExec, _ *fakeGuestPowerCtl) { ex.health = "healthy" }},
		{"starting", func(_ *Server, ex *opExec, _ *fakeGuestPowerCtl) { ex.health = "starting" }},
		{"swap", func(s *Server, _ *opExec, _ *fakeGuestPowerCtl) { s.swapInFlight[9201] = true }},
		{"vzdump", func(_ *Server, _ *opExec, ctl *fakeGuestPowerCtl) { ctl.backupRun = map[int]bool{9201: true} }},
		{"locked", func(_ *Server, _ *opExec, ctl *fakeGuestPowerCtl) { ctl.locks[9201] = "backup" }},
	} {
		t.Run(tc.name, func(t *testing.T) {
			s, ex, ctl := unrespServer(t, "unhealthy")
			tc.setup(s, ex, ctl)
			sweep(s, controllerUnresponsiveConfirm+2)
			if g := s.ControllerSupervisorStatus(context.Background()).Guests; len(g) == 1 && g[0].Unresponsive {
				t.Fatalf("%s counted as unresponsive: %+v", tc.name, g[0])
			}
		})
	}
}