package domain

import (
	"errors"
	"testing"
	"time"
)

func TestQueueFencesOneActiveTicketPerPlayerAndReplaysCreate(t *testing.T) {
	q := NewQueue()
	now := time.Unix(1000, 0)
	c := Candidate{TicketID: "ticket-a", PlayerID: "player-a", EnqueuedAt: now, PredictedRTT: map[string]float64{"EU": 20}}
	first, err := q.Create("player-a", "ticket-a", "create-key-123456", c, now)
	if err != nil { t.Fatal(err) }
	replay, err := q.Create("player-a", "ticket-a", "create-key-123456", c, now.Add(time.Second))
	if err != nil || replay != first { t.Fatalf("create replay = %+v, %v", replay, err) }
	other := c; other.TicketID = "ticket-b"
	if _, err := q.Create("player-a", "ticket-b", "create-key-654321", other, now); !errors.Is(err, ErrPlayerQueued) { t.Fatalf("second active ticket error = %v", err) }
}

func TestQueueHeartbeatExtendsExpiryExactlyAndRejectsStaleReplay(t *testing.T) {
	q := NewQueue(); now := time.Unix(1000, 0)
	c := Candidate{TicketID: "ticket-a", PlayerID: "player-a", EnqueuedAt: now}
	if _, err := q.Create("player-a", "ticket-a", "create-key-123456", c, now); err != nil { t.Fatal(err) }
	updated, err := q.Heartbeat("player-a", "ticket-a", "heartbeat-key-123", 0, now.Add(10*time.Second))
	if err != nil { t.Fatal(err) }
	if !updated.ExpiresAt.Equal(now.Add(40 * time.Second)) || updated.Revision != 1 { t.Fatalf("bad heartbeat: %+v", updated) }
	replay, err := q.Heartbeat("player-a", "ticket-a", "heartbeat-key-123", 0, now.Add(50*time.Second))
	if err != nil || replay != updated { t.Fatalf("heartbeat replay = %+v, %v", replay, err) }
	if _, err := q.Heartbeat("player-a", "ticket-a", "heartbeat-key-456", 0, now.Add(20*time.Second)); !errors.Is(err, ErrStaleRevision) { t.Fatalf("stale heartbeat error = %v", err) }
}

func TestQueueExpiryReleasesOwnershipAndDoesNotReturnExpiredCandidates(t *testing.T) {
	q := NewQueue(); now := time.Unix(1000, 0)
	c := Candidate{TicketID: "ticket-a", PlayerID: "player-a", EnqueuedAt: now}
	if _, err := q.Create("player-a", "ticket-a", "create-key-123456", c, now); err != nil { t.Fatal(err) }
	if got := q.Candidates(now.Add(QueueExpiryWindow)); len(got) != 0 { t.Fatalf("expired candidate returned: %+v", got) }
	if _, err := q.Create("player-a", "ticket-b", "create-key-654321", Candidate{TicketID: "ticket-b", PlayerID: "player-a"}, now.Add(QueueExpiryWindow)); err != nil { t.Fatalf("ownership was not released: %v", err) }
}

func TestQueueCreateIdempotencyIncludesCandidatePayload(t *testing.T) {
	q := NewQueue(); now := time.Unix(1000, 0)
	base := Candidate{TicketID: "ticket-a", PlayerID: "player-a", Rating: 1500, EnqueuedAt: now, PredictedRTT: map[string]float64{"EU": 20}}
	if _, err := q.Create("player-a", "ticket-a", "create-key-123456", base, now); err != nil { t.Fatal(err) }
	changed := base; changed.Rating = 1800
	if _, err := q.Create("player-a", "ticket-a", "create-key-123456", changed, now); !errors.Is(err, ErrConflict) { t.Fatalf("changed create payload error = %v", err) }
}