package holdreport

import (
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

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

type fakeStore struct {
	holds    map[string]settings.RestoreHold
	reported map[string]string
}

func (f *fakeStore) ListRestoreHolds() []settings.RestoreHold {
	out := []settings.RestoreHold{}
	for _, h := range f.holds {
		out = append(out, h)
	}
	return out
}
func (f *fakeStore) GetReportedHolds() map[string]string {
	out := map[string]string{}
	for k, v := range f.reported {
		out[k] = v
	}
	return out
}
func (f *fakeStore) SetReportedHolds(m map[string]string) error { f.reported = m; return nil }

type sent struct {
	typ, sev string
	d        Details
}

func rec(out *[]sent) Push {
	return func(t, sev, msg string, d interface{}) { *out = append(*out, sent{t, sev, d.(Details)}) }
}

var t0 = time.Date(2026, 10, 26, 18, 0, 0, 0, time.UTC)

// The report field (D53): a new hold is sent once as app_held with its stack, reason and since, severity info (the hub
// mails nothing on receipt; its reminder after the grace is the mail).
func TestD53_ANewHoldIsReportedWithStackReasonAndSince(t *testing.T) {
	st := &fakeStore{holds: map[string]settings.RestoreHold{
		"kimai": {Stack: "kimai", At: "2026-10-14T08:00:00Z", Reason: settings.HoldReasonUnhealthyStop, UnhealthyKind: "crash_loop"},
	}}
	var out []sent
	r := New(st, rec(&out), nil)
	r.Tick(t0)
	if len(out) != 1 || out[0].typ != EventHeld || out[0].sev != "info" {
		t.Fatalf("want one info app_held, got %+v", out)
	}
	d := out[0].d
	if d.StackName != "kimai" || d.Reason != "unhealthy_stop" || d.Since != "2026-10-14T08:00:00Z" || d.Why == "" {
		t.Fatalf("payload: %+v", d)
	}
	if st.reported["kimai"] != "unhealthy_stop|2026-10-14T08:00:00Z" {
		t.Fatalf("reported record: %v", st.reported)
	}
	// The next tick inside a day sends nothing.
	out = nil
	r.Tick(t0.Add(time.Minute))
	if len(out) != 0 {
		t.Fatalf("an unchanged hold was sent again inside a day: %+v", out)
	}
}

// An event can be lost: every hold still in place is sent again after a day, marked as a repeat.
func TestD53_AHoldIsSentAgainEveryDay(t *testing.T) {
	st := &fakeStore{holds: map[string]settings.RestoreHold{"a": {Stack: "a", At: "2026-10-20T00:00:00Z", Reason: settings.HoldReasonUpdateFailed}}}
	var out []sent
	r := New(st, rec(&out), nil)
	r.Tick(t0)
	out = nil
	r.Tick(t0.Add(ResendEvery))
	if len(out) != 1 || out[0].typ != EventHeld || !out[0].d.Repeat {
		t.Fatalf("want one repeat app_held after a day, got %+v", out)
	}
}

// A hold cleared by a person ends it: one app_hold_cleared, then nothing.
func TestD53_AClearedHoldSendsClearedOnce(t *testing.T) {
	st := &fakeStore{holds: map[string]settings.RestoreHold{"a": {Stack: "a", At: "2026-10-20T00:00:00Z", Reason: settings.HoldReasonRestoreMixed}}}
	var out []sent
	r := New(st, rec(&out), nil)
	r.Tick(t0)
	delete(st.holds, "a")
	out = nil
	r.Tick(t0.Add(time.Minute))
	if len(out) != 1 || out[0].typ != EventCleared || out[0].d.StackName != "a" || out[0].sev != "info" {
		t.Fatalf("want one info app_hold_cleared for a, got %+v", out)
	}
	if len(st.reported) != 0 {
		t.Fatalf("the reported record still names the cleared hold: %v", st.reported)
	}
	out = nil
	r.Tick(t0.Add(2 * time.Minute))
	r.Tick(t0.Add(ResendEvery + time.Hour))
	if len(out) != 0 {
		t.Fatalf("a cleared hold was reported again: %+v", out)
	}
}

// A hold cleared while the controller was down is still reported cleared: the record lives in settings.
func TestD53_AHoldClearedWhileDownIsReportedAtStart(t *testing.T) {
	st := &fakeStore{holds: map[string]settings.RestoreHold{}, reported: map[string]string{"gone": "update_failed|2026-10-01T00:00:00Z"}}
	var out []sent
	New(st, rec(&out), nil).Tick(t0)
	if len(out) != 1 || out[0].typ != EventCleared || out[0].d.StackName != "gone" {
		t.Fatalf("want app_hold_cleared for gone at start, got %+v", out)
	}
}

// A hold whose reason changes (a put-back that failed becomes a mixed restore) is a new hold for the hub.
func TestD53_AChangedReasonIsReportedAgain(t *testing.T) {
	st := &fakeStore{holds: map[string]settings.RestoreHold{"a": {Stack: "a", At: "2026-10-20T00:00:00Z", Reason: settings.HoldReasonPutBackPending}}}
	var out []sent
	r := New(st, rec(&out), nil)
	r.Tick(t0)
	st.holds["a"] = settings.RestoreHold{Stack: "a", At: "2026-10-20T01:00:00Z", Reason: settings.HoldReasonRestoreMixed}
	out = nil
	r.Tick(t0.Add(time.Minute))
	if len(out) != 1 || out[0].typ != EventHeld || out[0].d.Reason != "restore_mixed" || out[0].d.Repeat {
		t.Fatalf("want a new (not repeat) app_held restore_mixed, got %+v", out)
	}
}

// The legacy empty reason is a restore that failed with its rollback: the hub reads it as restore_failed.
func TestD53_TheEmptyReasonIsRestoreFailedOnTheWire(t *testing.T) {
	st := &fakeStore{holds: map[string]settings.RestoreHold{"db": {Stack: "db", At: "2026-10-20T00:00:00Z"}}}
	var out []sent
	New(st, rec(&out), nil).Tick(t0)
	if len(out) != 1 || out[0].d.Reason != "restore_failed" {
		t.Fatalf("want reason restore_failed, got %+v", out)
	}
}

// The seam is wired: main builds the reporter on the real settings and notifier and ticks it from the scheduler. A
// reporter nobody ticks is the inert-seam shape (four instances in this project). A commented-out line does not count.
func TestD53_TheReporterIsWiredInMain(t *testing.T) {
	raw, err := os.ReadFile(filepath.Join("..", "..", "cmd", "controller", "main.go"))
	if err != nil {
		t.Fatalf("cannot read main.go: %v", err)
	}
	live := []string{}
	for _, l := range strings.Split(string(raw), "\n") {
		if !strings.HasPrefix(strings.TrimSpace(l), "//") {
			live = append(live, l)
		}
	}
	src := strings.Join(live, "\n")
	for _, want := range []string{"holdreport.New(sett, notifier.PushEvent, logger)", `sched.Every("hold-report"`, "holdReporter.Tick("} {
		if !strings.Contains(src, want) {
			t.Errorf("main.go lacks %q — the hold report is not wired", want)
		}
	}
}

// The reported record survives a restart: it is what lets a hold cleared while the controller was down be reported.
func TestD53_TheReportedRecordSurvivesAReload(t *testing.T) {
	p := filepath.Join(t.TempDir(), "settings.json")
	s, err := settings.Load(p, log.New(io.Discard, "", 0))
	if err != nil {
		t.Fatal(err)
	}
	if err := s.SetReportedHolds(map[string]string{"kimai": "unhealthy_stop|2026-10-14T08:00:00Z"}); err != nil {
		t.Fatal(err)
	}
	s2, err := settings.Load(p, log.New(io.Discard, "", 0))
	if err != nil {
		t.Fatal(err)
	}
	if got := s2.GetReportedHolds()["kimai"]; got != "unhealthy_stop|2026-10-14T08:00:00Z" {
		t.Fatalf("after a reload the record reads %q", got)
	}
}