package inventory

import (
	"testing"
	"time"
)

// A walk is said started on the save that finds it live, ended on the save that finds it ended after it started,
// and neither on any other save (novox/hq ADR 0308 decision 1).
func TestAWalkIsSaidStartedOnceAndEndedOnce(t *testing.T) {
	now := time.Date(2026, 10, 12, 11, 0, 0, 0, time.UTC)
	cut := now.Add(-time.Second)
	p := Plan{ID: "plan-1", State: PlanBuilding, Tiers: [][]string{{"messenger"}},
		Modules: map[string]*PlanModule{"messenger": {}}, Times: &PlanTimes{Cut: &cut, Class: ClassLeaf}}
	p.markWalk(now)
	if p.WalkSaid != WalkStarted || p.Times.Started == nil || !p.Times.Started.Equal(now) {
		t.Fatalf("a live walk's first save starts it: %q %+v", p.WalkSaid, p.Times)
	}
	p.State = PlanRolling
	p.markWalk(now.Add(time.Minute))
	if p.WalkSaid != "" || !p.Times.Started.Equal(now) {
		t.Fatalf("a later save says nothing and keeps the start: %q %+v", p.WalkSaid, p.Times)
	}
	p.State = PlanDone
	p.markWalk(now.Add(2 * time.Minute))
	if p.WalkSaid != WalkEnded || p.Times.Ended == nil || p.Outcome() != WalkDelivered {
		t.Fatalf("the save that finds it done ends it, delivered: %q %+v %q", p.WalkSaid, p.Times, p.Outcome())
	}
	p.markWalk(now.Add(3 * time.Minute))
	if p.WalkSaid != "" {
		t.Fatalf("an ended walk saved again says nothing: %q", p.WalkSaid)
	}
	// Retried, it walks again: a new start.
	p.State = PlanBuilding
	p.markWalk(now.Add(4 * time.Minute))
	if p.WalkSaid != WalkStarted || p.Times.Ended != nil || !p.Times.Started.Equal(now.Add(4*time.Minute)) {
		t.Fatalf("a retried walk starts again: %q %+v", p.WalkSaid, p.Times)
	}
}

// What is never said: a batch, a walk waiting for its word, a walk that ends without having started, and a walk
// kept before its times were. A release plan is said.
func TestWhatIsNotAWalkStartIsNotSaid(t *testing.T) {
	now := time.Now()
	for name, p := range map[string]Plan{
		"a batch":             {State: PlanAssembling, Times: &PlanTimes{}},
		"waiting for a word":  {State: PlanBuilding, Times: &PlanTimes{}, Delivery: &PlanDelivery{Awaits: "mesh-delivery"}},
		"ended, never begun":  {State: PlanDone, Times: &PlanTimes{}},
		"kept before times":   {State: PlanBuilding},
		"stopped while waits": {State: PlanFailed, Times: &PlanTimes{}, Delivery: &PlanDelivery{Awaits: "mesh-delivery", Stopped: "x"}},
	} {
		p.markWalk(now)
		if p.WalkSaid != "" {
			t.Errorf("%s: said %q", name, p.WalkSaid)
		}
	}
	r := Plan{State: PlanRolling, Release: &PlanRelease{Order: []string{"ace"}}}
	r.markWalk(now)
	if r.WalkSaid != WalkStarted || r.Times == nil || r.Times.Started == nil || r.Times.Class != "" {
		t.Fatalf("a release plan is said started, its times holding only that: %q %+v", r.WalkSaid, r.Times)
	}
	// Let go, the walk starts.
	go1 := now
	w := Plan{State: PlanBuilding, Times: &PlanTimes{}, Delivery: &PlanDelivery{Awaits: "mesh-delivery", Go: &go1}}
	w.markWalk(now)
	if w.WalkSaid != WalkStarted {
		t.Fatalf("a walk let go starts: %q", w.WalkSaid)
	}
}

// An ended walk's outcome: delivered, failed, or stopped by a person or the delivery's owner, or by a newer walk.
func TestAWalksOutcome(t *testing.T) {
	for want, p := range map[string]Plan{
		WalkDelivered: {State: PlanDone},
		WalkFailed:    {State: PlanFailed},
		WalkStopped:   {State: PlanFailed, Delivery: &PlanDelivery{Stopped: "mesh-delivery"}},
		"":            {State: PlanRolling},
	} {
		if got := p.Outcome(); got != want {
			t.Errorf("%s: outcome %q, want %q", p.State, got, want)
		}
	}
	if (Plan{State: PlanSuperseded}).Outcome() != WalkStopped {
		t.Error("a superseded walk is stopped")
	}
}

// The marks are kept with the walk, so a controller replaced mid-walk neither says its start again nor misses
// its end; and a save refused leaves the walk unmarked, so the save that is made says it.
func TestAWalksStartIsKeptAndARefusedSaveLeavesItUnsaid(t *testing.T) {
	inv := ForTest(t)
	ctx := t.Context()
	cut := time.Now().UTC().Add(-time.Minute)
	p := Plan{ID: "plan-308", Repository: "novox/mesh-catalog", Commit: "abc", Created: cut, State: PlanBuilding,
		Tiers: [][]string{{"messenger"}}, Modules: map[string]*PlanModule{"messenger": {}},
		Times: &PlanTimes{Cut: &cut, Class: ClassLeaf}}
	var said []string
	was := PlanSaved
	PlanSaved = func(_ *Inventory, p Plan) { said = append(said, p.WalkSaid) }
	t.Cleanup(func() { PlanSaved = was })
	if err := inv.SavePlan(ctx, &p); err != nil {
		t.Fatal(err)
	}
	back, err := inv.PlanByID(ctx, p.ID)
	if err != nil || back.Times == nil || back.Times.Started == nil || back.Times.Class != ClassLeaf {
		t.Fatalf("the start is kept with the walk: %v %+v", err, back.Times)
	}
	// Read back by another controller and saved: not said again.
	back.State = PlanRolling
	if err := inv.SavePlan(ctx, &back); err != nil {
		t.Fatal(err)
	}
	// A stale copy ending it is refused, and unmarked.
	stale := p
	stale.Revision = 1
	stale.State = PlanDone
	if err := inv.SavePlan(ctx, &stale); err == nil {
		t.Fatal("a stale save is refused")
	}
	if stale.WalkSaid != "" || stale.Times.Ended != nil {
		t.Fatalf("a refused save is unmarked: %q %+v", stale.WalkSaid, stale.Times)
	}
	back.State = PlanDone
	if err := inv.SavePlan(ctx, &back); err != nil {
		t.Fatal(err)
	}
	if len(said) != 3 || said[0] != WalkStarted || said[1] != "" || said[2] != WalkEnded {
		t.Fatalf("said: %q, want started, nothing, ended", said)
	}
}