package playback_test

import (
	"context"
	"testing"
	"time"

	"github.com/Silo-Server/silo-server/internal/playback"
)

func TestSessionManager_StartStop(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	session, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}
	if session.ID == "" {
		t.Error("session ID is empty")
	}
	if session.UserID != 1 {
		t.Errorf("UserID = %d, want 1", session.UserID)
	}
	if session.ProfileID != "profile-1" {
		t.Errorf("ProfileID = %q, want profile-1", session.ProfileID)
	}
	if session.MediaFileID != 100 {
		t.Errorf("MediaFileID = %d, want 100", session.MediaFileID)
	}
	if session.RequestedMediaFileID != 100 {
		t.Errorf("RequestedMediaFileID = %d, want 100", session.RequestedMediaFileID)
	}
	if session.PlayMethod != playback.PlayDirect {
		t.Errorf("PlayMethod = %q, want direct", session.PlayMethod)
	}
	if session.BasePlayMethod != playback.PlayDirect {
		t.Errorf("BasePlayMethod = %q, want direct", session.BasePlayMethod)
	}
	if session.IsPaused {
		t.Error("new session should not be paused")
	}

	// GetSession should return the session.
	got, err := sm.GetSession(session.ID)
	if err != nil {
		t.Fatalf("GetSession: %v", err)
	}
	if got.ID != session.ID {
		t.Errorf("GetSession ID = %q, want %q", got.ID, session.ID)
	}

	// ActiveCount should be 1.
	if sm.ActiveCount(1) != 1 {
		t.Errorf("ActiveCount = %d, want 1", sm.ActiveCount(1))
	}

	// Stop the session.
	if err := sm.StopSession(session.ID); err != nil {
		t.Fatalf("StopSession: %v", err)
	}

	// GetSession should now fail.
	_, err = sm.GetSession(session.ID)
	if err != playback.ErrSessionNotFound {
		t.Errorf("GetSession after stop = %v, want ErrSessionNotFound", err)
	}

	// ActiveCount should be 0.
	if sm.ActiveCount(1) != 0 {
		t.Errorf("ActiveCount after stop = %d, want 0", sm.ActiveCount(1))
	}
}

func TestSessionManager_StopNonExistent(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	err := sm.StopSession("nonexistent-id")
	if err != playback.ErrSessionNotFound {
		t.Errorf("StopSession(nonexistent) = %v, want ErrSessionNotFound", err)
	}
}

func TestSessionManager_UpdateProgress(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	session, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}

	// Update progress.
	if err := sm.UpdateProgress(session.ID, 123.5, false); err != nil {
		t.Fatalf("UpdateProgress: %v", err)
	}

	got, err := sm.GetSession(session.ID)
	if err != nil {
		t.Fatalf("GetSession: %v", err)
	}
	if got.Position != 123.5 {
		t.Errorf("Position = %f, want 123.5", got.Position)
	}
	if got.IsPaused {
		t.Error("IsPaused should be false")
	}

	// Pause.
	if err := sm.UpdateProgress(session.ID, 123.5, true); err != nil {
		t.Fatalf("UpdateProgress(pause): %v", err)
	}

	got, err = sm.GetSession(session.ID)
	if err != nil {
		t.Fatalf("GetSession: %v", err)
	}
	if !got.IsPaused {
		t.Error("IsPaused should be true after pause")
	}
}

func TestSessionManager_UpdateProgress_NotFound(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	err := sm.UpdateProgress("nonexistent", 0, false)
	if err != playback.ErrSessionNotFound {
		t.Errorf("UpdateProgress(nonexistent) = %v, want ErrSessionNotFound", err)
	}
}

func TestSessionManager_GetSessionsByMediaFileID(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	matchA, _ := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	matchB, _ := sm.StartSession(2, "profile-2", 100, playback.PlayDirect, false)
	matchRequested, _ := sm.StartSessionWithFiles(4, "profile-4", 200, 100, playback.PlayDirect, false)
	other, _ := sm.StartSession(3, "profile-3", 101, playback.PlayDirect, false)

	sessions := sm.GetSessionsByMediaFileID(100)
	if len(sessions) != 3 {
		t.Fatalf("len(GetSessionsByMediaFileID(100)) = %d, want 3", len(sessions))
	}

	gotIDs := map[string]struct{}{}
	for _, session := range sessions {
		gotIDs[session.ID] = struct{}{}
	}
	if _, ok := gotIDs[matchA.ID]; !ok {
		t.Fatalf("missing matching session %q", matchA.ID)
	}
	if _, ok := gotIDs[matchB.ID]; !ok {
		t.Fatalf("missing matching session %q", matchB.ID)
	}
	if _, ok := gotIDs[matchRequested.ID]; !ok {
		t.Fatalf("missing requested-file session %q", matchRequested.ID)
	}
	if _, ok := gotIDs[other.ID]; ok {
		t.Fatalf("unexpected non-matching session %q", other.ID)
	}
}

func TestUpdateAudioTrack(t *testing.T) {
	sm := playback.NewSessionManager(10, 5)

	session, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}

	// Switch to audio track 2 with remux method.
	if err := sm.UpdateAudioTrack(session.ID, 2, playback.PlayRemux); err != nil {
		t.Fatalf("UpdateAudioTrack: %v", err)
	}

	got, err := sm.GetSession(session.ID)
	if err != nil {
		t.Fatalf("GetSession: %v", err)
	}
	if got.AudioTrackIndex != 2 {
		t.Errorf("AudioTrackIndex = %d, want 2", got.AudioTrackIndex)
	}
	if got.PlayMethod != playback.PlayRemux {
		t.Errorf("PlayMethod = %q, want %q", got.PlayMethod, playback.PlayRemux)
	}
	if got.BasePlayMethod != playback.PlayRemux {
		t.Errorf("BasePlayMethod = %q, want %q", got.BasePlayMethod, playback.PlayRemux)
	}

	// Nonexistent session should return ErrSessionNotFound.
	err = sm.UpdateAudioTrack("nonexistent-id", 1, playback.PlayDirect)
	if err != playback.ErrSessionNotFound {
		t.Errorf("UpdateAudioTrack(nonexistent) = %v, want ErrSessionNotFound", err)
	}
}

func TestSessionManager_StreamLimitEnforcement(t *testing.T) {
	sm := playback.NewSessionManager(2, 1) // max 2 streams, 1 transcode

	// Start two sessions (hits the limit).
	s1, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession 1: %v", err)
	}
	_, err = sm.StartSession(1, "profile-1", 101, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession 2: %v", err)
	}

	// Third session should fail.
	_, err = sm.StartSession(1, "profile-1", 102, playback.PlayDirect, false)
	if err != playback.ErrTooManyStreams {
		t.Errorf("StartSession 3 = %v, want ErrTooManyStreams", err)
	}

	// Stop one session and try again.
	if err := sm.StopSession(s1.ID); err != nil {
		t.Fatalf("StopSession: %v", err)
	}

	_, err = sm.StartSession(1, "profile-1", 102, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession after stop: %v", err)
	}
}

func TestSessionManager_TranscodeLimitEnforcement(t *testing.T) {
	sm := playback.NewSessionManager(5, 1) // max 5 streams, 1 transcode

	// Start one transcode session.
	s1, err := sm.StartSession(1, "profile-1", 100, playback.PlayTranscode, false)
	if err != nil {
		t.Fatalf("StartSession transcode 1: %v", err)
	}

	// Second transcode should fail.
	_, err = sm.StartSession(1, "profile-1", 101, playback.PlayTranscode, false)
	if err != playback.ErrTooManyTranscodes {
		t.Errorf("StartSession transcode 2 = %v, want ErrTooManyTranscodes", err)
	}

	// Direct play should still work (transcode limit doesn't block direct).
	_, err = sm.StartSession(1, "profile-1", 102, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession direct while transcode limit hit: %v", err)
	}

	// TranscodeCount should be 1.
	if sm.TranscodeCount(1) != 1 {
		t.Errorf("TranscodeCount = %d, want 1", sm.TranscodeCount(1))
	}

	// Stop the transcode session.
	if err := sm.StopSession(s1.ID); err != nil {
		t.Fatalf("StopSession: %v", err)
	}

	// Now another transcode should work.
	_, err = sm.StartSession(1, "profile-1", 103, playback.PlayTranscode, false)
	if err != nil {
		t.Fatalf("StartSession transcode after stop: %v", err)
	}
}

func TestSessionManager_UserLimitProviderOverridesDefaults(t *testing.T) {
	sm := playback.NewSessionManager(6, 2)
	sm.SetLimitProvider(func(_ context.Context, userID int) (playback.SessionLimits, error) {
		switch userID {
		case 1:
			return playback.SessionLimits{MaxStreams: 1, MaxTranscodes: 1}, nil
		default:
			return playback.SessionLimits{MaxStreams: 6, MaxTranscodes: 2}, nil
		}
	})

	if _, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false); err != nil {
		t.Fatalf("StartSession user 1: %v", err)
	}
	if _, err := sm.StartSession(1, "profile-1", 101, playback.PlayDirect, false); err != playback.ErrTooManyStreams {
		t.Fatalf("StartSession user 1 over stream limit = %v, want ErrTooManyStreams", err)
	}

	if _, err := sm.StartSession(2, "profile-2", 200, playback.PlayDirect, false); err != nil {
		t.Fatalf("StartSession user 2: %v", err)
	}
	if _, err := sm.StartSession(2, "profile-2", 201, playback.PlayDirect, false); err != nil {
		t.Fatalf("StartSession user 2 second stream: %v", err)
	}
}

func TestSessionManager_UserLimitProviderAppliesTranscodeLimitOnlyToTranscodes(t *testing.T) {
	sm := playback.NewSessionManager(6, 2)
	sm.SetLimitProvider(func(context.Context, int) (playback.SessionLimits, error) {
		return playback.SessionLimits{MaxStreams: 3, MaxTranscodes: 1}, nil
	})

	if _, err := sm.StartSession(1, "profile-1", 100, playback.PlayTranscode, false); err != nil {
		t.Fatalf("StartSession transcode: %v", err)
	}
	if _, err := sm.StartSession(1, "profile-1", 101, playback.PlayTranscode, false); err != playback.ErrTooManyTranscodes {
		t.Fatalf("StartSession over transcode limit = %v, want ErrTooManyTranscodes", err)
	}
	if _, err := sm.StartSession(1, "profile-1", 102, playback.PlayDirect, false); err != nil {
		t.Fatalf("StartSession direct while transcode limit hit: %v", err)
	}
}

func TestSessionManager_MultipleUsers(t *testing.T) {
	sm := playback.NewSessionManager(2, 1) // max 2 streams per user

	// User 1 fills their slots.
	_, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("User1 session 1: %v", err)
	}
	_, err = sm.StartSession(1, "profile-1", 101, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("User1 session 2: %v", err)
	}

	// User 1 should be blocked.
	_, err = sm.StartSession(1, "profile-1", 102, playback.PlayDirect, false)
	if err != playback.ErrTooManyStreams {
		t.Errorf("User1 session 3 = %v, want ErrTooManyStreams", err)
	}

	// User 2 should be unaffected.
	_, err = sm.StartSession(2, "profile-2", 200, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("User2 session 1: %v", err)
	}
	_, err = sm.StartSession(2, "profile-2", 201, playback.PlayTranscode, false)
	if err != nil {
		t.Fatalf("User2 session 2 (transcode): %v", err)
	}

	// Verify counts are isolated.
	if sm.ActiveCount(1) != 2 {
		t.Errorf("User1 ActiveCount = %d, want 2", sm.ActiveCount(1))
	}
	if sm.ActiveCount(2) != 2 {
		t.Errorf("User2 ActiveCount = %d, want 2", sm.ActiveCount(2))
	}
	if sm.TranscodeCount(1) != 0 {
		t.Errorf("User1 TranscodeCount = %d, want 0", sm.TranscodeCount(1))
	}
	if sm.TranscodeCount(2) != 1 {
		t.Errorf("User2 TranscodeCount = %d, want 1", sm.TranscodeCount(2))
	}
}

func TestSessionManager_GetUserSessions(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	// Create sessions for two users.
	_, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}
	_, err = sm.StartSession(1, "profile-1", 101, playback.PlayTranscode, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}
	_, err = sm.StartSession(2, "profile-2", 200, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}

	user1Sessions := sm.GetUserSessions(1)
	if len(user1Sessions) != 2 {
		t.Errorf("User1 sessions = %d, want 2", len(user1Sessions))
	}

	user2Sessions := sm.GetUserSessions(2)
	if len(user2Sessions) != 1 {
		t.Errorf("User2 sessions = %d, want 1", len(user2Sessions))
	}

	// Non-existent user should return nil/empty.
	user3Sessions := sm.GetUserSessions(3)
	if len(user3Sessions) != 0 {
		t.Errorf("User3 sessions = %d, want 0", len(user3Sessions))
	}
}

func TestSessionManager_AllSessions(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	// Empty manager returns empty slice.
	all := sm.AllSessions()
	if len(all) != 0 {
		t.Errorf("AllSessions on empty manager = %d, want 0", len(all))
	}

	// Start sessions for two users.
	s1, _ := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	s2, _ := sm.StartSession(1, "profile-1", 101, playback.PlayRemux, false)
	s3, _ := sm.StartSession(2, "profile-2", 200, playback.PlayTranscode, false)

	all = sm.AllSessions()
	if len(all) != 3 {
		t.Fatalf("AllSessions = %d, want 3", len(all))
	}

	// Verify sessions are returned (order is non-deterministic with maps).
	ids := map[string]bool{}
	for _, s := range all {
		ids[s.ID] = true
	}
	for _, expected := range []string{s1.ID, s2.ID, s3.ID} {
		if !ids[expected] {
			t.Errorf("AllSessions missing session %s", expected)
		}
	}

	// Verify returned sessions are copies (mutating shouldn't affect manager).
	all[0].Position = 999.0
	original, _ := sm.GetSession(all[0].ID)
	if original.Position == 999.0 {
		t.Error("AllSessions should return copies, but mutation propagated")
	}
}

func TestSetTranscodeNodeURL(t *testing.T) {
	mgr := playback.NewSessionManager(0, 0)
	session, err := mgr.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatal(err)
	}

	url := "http://transcode-1:8070"
	if err := mgr.SetTranscodeNodeURL(session.ID, url); err != nil {
		t.Fatalf("SetTranscodeNodeURL: %v", err)
	}

	got, err := mgr.GetSession(session.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got.TranscodeNodeURL != url {
		t.Errorf("TranscodeNodeURL = %q, want %q", got.TranscodeNodeURL, url)
	}
}

func TestSetTranscodeNodeURL_NotFound(t *testing.T) {
	mgr := playback.NewSessionManager(0, 0)
	err := mgr.SetTranscodeNodeURL("nonexistent", "http://node:8070")
	if err != playback.ErrSessionNotFound {
		t.Errorf("expected ErrSessionNotFound, got %v", err)
	}
}

func TestSetEffectiveMediaFileID(t *testing.T) {
	mgr := playback.NewSessionManager(0, 0)
	session, err := mgr.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatal(err)
	}

	if err := mgr.SetEffectiveMediaFileID(session.ID, 200); err != nil {
		t.Fatalf("SetEffectiveMediaFileID: %v", err)
	}

	got, err := mgr.GetSession(session.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got.MediaFileID != 200 {
		t.Errorf("MediaFileID = %d, want 200", got.MediaFileID)
	}
	if got.RequestedMediaFileID != 100 {
		t.Errorf("RequestedMediaFileID = %d, want 100", got.RequestedMediaFileID)
	}
}

func TestStartSessionWithFiles(t *testing.T) {
	mgr := playback.NewSessionManager(0, 0)
	session, err := mgr.StartSessionWithFiles(1, "profile-1", 200, 100, playback.PlayRemux, true)
	if err != nil {
		t.Fatalf("StartSessionWithFiles: %v", err)
	}

	if session.MediaFileID != 200 {
		t.Errorf("MediaFileID = %d, want 200", session.MediaFileID)
	}
	if session.RequestedMediaFileID != 100 {
		t.Errorf("RequestedMediaFileID = %d, want 100", session.RequestedMediaFileID)
	}
	if session.BasePlayMethod != playback.PlayRemux {
		t.Errorf("BasePlayMethod = %q, want %q", session.BasePlayMethod, playback.PlayRemux)
	}
	if !session.TranscodeAudio {
		t.Error("TranscodeAudio = false, want true")
	}
}

func TestUpdateStreamState(t *testing.T) {
	mgr := playback.NewSessionManager(0, 0)
	session, err := mgr.StartSession(1, "profile-1", 100, playback.PlayRemux, false)
	if err != nil {
		t.Fatal(err)
	}

	err = mgr.UpdateStreamState(session.ID, playback.SessionStreamState{
		PlayMethod:        playback.PlayTranscode,
		BasePlayMethod:    playback.PlayRemux,
		AudioTrackIndex:   2,
		TranscodeAudio:    true,
		ClientIP:          "10.0.0.10",
		StreamBitrateKbps: 4200,
		TargetResolution:  "1080p",
		TargetVideoCodec:  "h264",
		TargetAudioCodec:  "aac",
		TargetBitrateKbps: 4000,
	})
	if err != nil {
		t.Fatalf("UpdateStreamState: %v", err)
	}

	got, err := mgr.GetSession(session.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got.PlayMethod != playback.PlayTranscode {
		t.Errorf("PlayMethod = %q, want %q", got.PlayMethod, playback.PlayTranscode)
	}
	if got.BasePlayMethod != playback.PlayRemux {
		t.Errorf("BasePlayMethod = %q, want %q", got.BasePlayMethod, playback.PlayRemux)
	}
	if got.AudioTrackIndex != 2 {
		t.Errorf("AudioTrackIndex = %d, want 2", got.AudioTrackIndex)
	}
	if !got.TranscodeAudio {
		t.Error("TranscodeAudio = false, want true")
	}
	if got.ClientIP != "10.0.0.10" {
		t.Errorf("ClientIP = %q, want %q", got.ClientIP, "10.0.0.10")
	}
	if got.StreamBitrateKbps != 4200 {
		t.Errorf("StreamBitrateKbps = %d, want 4200", got.StreamBitrateKbps)
	}
	if got.TargetResolution != "1080p" {
		t.Errorf("TargetResolution = %q, want %q", got.TargetResolution, "1080p")
	}
	if got.TargetVideoCodec != "h264" {
		t.Errorf("TargetVideoCodec = %q, want %q", got.TargetVideoCodec, "h264")
	}
	if got.TargetAudioCodec != "aac" {
		t.Errorf("TargetAudioCodec = %q, want %q", got.TargetAudioCodec, "aac")
	}
	if got.TargetBitrateKbps != 4000 {
		t.Errorf("TargetBitrateKbps = %d, want 4000", got.TargetBitrateKbps)
	}
}

func TestUpdateAudioTrack_PreservesTranscodeTransportForRemuxBase(t *testing.T) {
	mgr := playback.NewSessionManager(0, 0)
	session, err := mgr.StartSession(1, "profile-1", 100, playback.PlayRemux, false)
	if err != nil {
		t.Fatal(err)
	}

	err = mgr.UpdateStreamState(session.ID, playback.SessionStreamState{
		PlayMethod:      playback.PlayTranscode,
		BasePlayMethod:  playback.PlayRemux,
		AudioTrackIndex: 0,
	})
	if err != nil {
		t.Fatalf("UpdateStreamState: %v", err)
	}

	err = mgr.UpdateAudioTrack(session.ID, 1, playback.PlayRemux)
	if err != nil {
		t.Fatalf("UpdateAudioTrack: %v", err)
	}

	got, err := mgr.GetSession(session.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got.PlayMethod != playback.PlayTranscode {
		t.Errorf("PlayMethod = %q, want %q", got.PlayMethod, playback.PlayTranscode)
	}
	if got.BasePlayMethod != playback.PlayRemux {
		t.Errorf("BasePlayMethod = %q, want %q", got.BasePlayMethod, playback.PlayRemux)
	}
	if got.AudioTrackIndex != 1 {
		t.Errorf("AudioTrackIndex = %d, want 1", got.AudioTrackIndex)
	}
}

func TestSessionManager_WebSocketTracking(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	session, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}

	// New sessions should not have WebSocket.
	got, _ := sm.GetSession(session.ID)
	if got.HasWebSocket {
		t.Error("new session should not have WebSocket")
	}

	// Set WebSocket connected.
	if err := sm.SetWebSocket(session.ID, true); err != nil {
		t.Fatalf("SetWebSocket(true): %v", err)
	}

	got, _ = sm.GetSession(session.ID)
	if !got.HasWebSocket {
		t.Error("HasWebSocket should be true after SetWebSocket(true)")
	}

	// Disconnect WebSocket.
	if err := sm.SetWebSocket(session.ID, false); err != nil {
		t.Fatalf("SetWebSocket(false): %v", err)
	}

	got, _ = sm.GetSession(session.ID)
	if got.HasWebSocket {
		t.Error("HasWebSocket should be false after SetWebSocket(false)")
	}
}

func TestSetRealtimeConnection(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	session, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}

	got, _ := sm.GetSession(session.ID)
	if got.HasRealtimeConnection {
		t.Error("new session should not have realtime connection")
	}

	if err := sm.SetRealtimeConnection(session.ID, true); err != nil {
		t.Fatalf("SetRealtimeConnection(true): %v", err)
	}

	got, _ = sm.GetSession(session.ID)
	if !got.HasRealtimeConnection {
		t.Error("HasRealtimeConnection should be true after SetRealtime(true)")
	}
	if !got.HasWebSocket {
		t.Error("HasWebSocket should mirror realtime connection state")
	}

	if err := sm.SetRealtimeConnection(session.ID, false); err != nil {
		t.Fatalf("SetRealtimeConnection(false): %v", err)
	}

	got, _ = sm.GetSession(session.ID)
	if got.HasRealtimeConnection {
		t.Error("HasRealtimeConnection should be false after SetRealtime(false)")
	}
	if got.HasWebSocket {
		t.Error("HasWebSocket should clear when realtime connection closes")
	}
}

func TestSessionManager_LimitCountsIgnoreStaleSessions(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)
	sm.SetLivenessGracePeriods(20*time.Millisecond, 40*time.Millisecond)

	if _, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false); err != nil {
		t.Fatalf("StartSession direct: %v", err)
	}
	if _, err := sm.StartSession(1, "profile-1", 101, playback.PlayTranscode, false); err != nil {
		t.Fatalf("StartSession transcode: %v", err)
	}

	time.Sleep(30 * time.Millisecond)

	if got := sm.ActiveCount(1); got != 0 {
		t.Fatalf("ActiveCount after grace = %d, want 0", got)
	}
	if got := sm.TranscodeCount(1); got != 0 {
		t.Fatalf("TranscodeCount after grace = %d, want 0", got)
	}
}

func TestSessionManager_ActiveTransportKeepsSessionLive(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)
	sm.SetLivenessGracePeriods(20*time.Millisecond, 40*time.Millisecond)

	session, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}
	if err := sm.BeginTransport(session.ID); err != nil {
		t.Fatalf("BeginTransport: %v", err)
	}

	time.Sleep(30 * time.Millisecond)

	if got := sm.ActiveCount(1); got != 1 {
		t.Fatalf("ActiveCount with active transport = %d, want 1", got)
	}

	if err := sm.EndTransport(session.ID); err != nil {
		t.Fatalf("EndTransport: %v", err)
	}
	time.Sleep(30 * time.Millisecond)

	if got := sm.ActiveCount(1); got != 0 {
		t.Fatalf("ActiveCount after transport ends = %d, want 0", got)
	}
}

func TestRealtimeDisconnectDoesNotStopSession(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	session, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}

	if err := sm.SetRealtimeConnection(session.ID, true); err != nil {
		t.Fatalf("SetRealtimeConnection(true): %v", err)
	}
	if err := sm.SetRealtimeConnection(session.ID, false); err != nil {
		t.Fatalf("SetRealtimeConnection(false): %v", err)
	}

	got, err := sm.GetSession(session.ID)
	if err != nil {
		t.Fatalf("GetSession after realtime disconnect: %v", err)
	}
	if got.ID != session.ID {
		t.Fatalf("GetSession ID = %q, want %q", got.ID, session.ID)
	}
	if sm.ActiveCount(1) != 1 {
		t.Errorf("ActiveCount after realtime disconnect = %d, want 1", sm.ActiveCount(1))
	}
}

func TestGetSessionIncludesRealtimeState(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	session, err := sm.StartSession(1, "profile-1", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}

	if err := sm.SetRealtimeConnection(session.ID, true); err != nil {
		t.Fatalf("SetRealtimeConnection(true): %v", err)
	}

	got, err := sm.GetSession(session.ID)
	if err != nil {
		t.Fatalf("GetSession: %v", err)
	}
	if !got.HasRealtimeConnection {
		t.Error("GetSession copy should include realtime connection state")
	}
	got.HasRealtimeConnection = false

	again, err := sm.GetSession(session.ID)
	if err != nil {
		t.Fatalf("GetSession after mutating copy: %v", err)
	}
	if !again.HasRealtimeConnection {
		t.Error("mutating GetSession copy should not change manager state")
	}
}

func TestSessionManager_SetWebSocket_NotFound(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	err := sm.SetWebSocket("nonexistent", true)
	if err != playback.ErrSessionNotFound {
		t.Errorf("SetWebSocket(nonexistent) = %v, want ErrSessionNotFound", err)
	}
}

func TestSessionManager_SetRealtimeConnection_NotFound(t *testing.T) {
	sm := playback.NewSessionManager(5, 2)

	err := sm.SetRealtimeConnection("nonexistent", true)
	if err != playback.ErrSessionNotFound {
		t.Errorf("SetRealtimeConnection(nonexistent) = %v, want ErrSessionNotFound", err)
	}
}

func TestSessionManager_ZeroLimits(t *testing.T) {
	// Zero limits means unlimited.
	sm := playback.NewSessionManager(0, 0)

	for i := range 10 {
		_, err := sm.StartSession(1, "profile-1", i, playback.PlayTranscode, false)
		if err != nil {
			t.Fatalf("StartSession %d with zero limits: %v", i, err)
		}
	}

	if sm.ActiveCount(1) != 10 {
		t.Errorf("ActiveCount = %d, want 10", sm.ActiveCount(1))
	}
}

func TestSessionManager_CleanExpired(t *testing.T) {
	sm := playback.NewSessionManager(0, 0)

	// Create three sessions.
	idle, _ := sm.StartSession(1, "prof", 100, playback.PlayDirect, false)
	active, _ := sm.StartSession(1, "prof", 101, playback.PlayDirect, false)
	transportActive, _ := sm.StartSession(1, "prof", 102, playback.PlayDirect, false)

	// Mark the third session as actively transporting media.
	_ = sm.BeginTransport(transportActive.ID)

	// Send a recent progress update on the "active" session so it stays fresh.
	_ = sm.UpdateProgress(active.ID, 42.0, false)

	// The "idle" session has no update since StartSession.
	// The "transportActive" session has an open media transport, so it should
	// be exempt.

	// CleanExpired with 0 duration expires everything without a WebSocket
	// that hasn't been updated "recently". Since all sessions were just
	// created, use a very short maxIdle to ensure only truly idle ones are
	// caught. We simulate staleness by using a large duration that none can
	// exceed.
	expired := sm.CleanExpired(0) // 0 means "expire anything older than now"

	// Both inactive sessions should be expired (UpdatedAt <= time.Now()).
	// The transport-active session should survive regardless of staleness.
	if len(expired) != 2 {
		t.Fatalf("CleanExpired(0) removed %d sessions, want 2", len(expired))
	}

	// Transport-active session should still exist.
	_, err := sm.GetSession(transportActive.ID)
	if err != nil {
		t.Errorf("transport-active session should survive CleanExpired, got: %v", err)
	}

	// The idle and active sessions should be gone.
	_, err = sm.GetSession(idle.ID)
	if err != playback.ErrSessionNotFound {
		t.Errorf("idle session should be expired, got: %v", err)
	}
	_, err = sm.GetSession(active.ID)
	if err != playback.ErrSessionNotFound {
		t.Errorf("active session should be expired with maxIdle=0, got: %v", err)
	}

	// Only 1 session should remain (the transport-active one).
	if sm.ActiveCount(1) != 1 {
		t.Errorf("ActiveCount = %d, want 1", sm.ActiveCount(1))
	}
}

func TestSessionManager_CleanExpired_RespectsMaxIdle(t *testing.T) {
	sm := playback.NewSessionManager(0, 0)

	// Create a session and immediately update it.
	s, _ := sm.StartSession(1, "prof", 100, playback.PlayDirect, false)
	_ = sm.UpdateProgress(s.ID, 10.0, false)

	// With a generous maxIdle, the session should survive.
	expired := sm.CleanExpired(time.Hour)
	if len(expired) != 0 {
		t.Errorf("CleanExpired(1h) removed %d sessions, want 0", len(expired))
	}

	if sm.ActiveCount(1) != 1 {
		t.Errorf("ActiveCount = %d, want 1", sm.ActiveCount(1))
	}
}

func TestSessionManager_CleanInactive_TriggersExpirationHook(t *testing.T) {
	sm := playback.NewSessionManager(0, 0)

	session, err := sm.StartSession(1, "prof", 100, playback.PlayDirect, false)
	if err != nil {
		t.Fatalf("StartSession: %v", err)
	}

	expiredCh := make(chan string, 1)
	sm.SetExpirationHook(func(session *playback.Session) {
		expiredCh <- session.ID
	})

	expired := sm.CleanInactive(0, 0)
	if len(expired) != 1 {
		t.Fatalf("CleanInactive removed %d sessions, want 1", len(expired))
	}

	select {
	case got := <-expiredCh:
		if got != session.ID {
			t.Fatalf("expiration hook session = %q, want %q", got, session.ID)
		}
	case <-time.After(time.Second):
		t.Fatal("expiration hook was not called")
	}
}

func TestSessionManager_CleanExpired_PausedGracePeriod(t *testing.T) {
	sm := playback.NewSessionManager(0, 0)

	// Create two sessions and mark one as paused.
	playing, _ := sm.StartSession(1, "prof", 100, playback.PlayDirect, false)
	paused, _ := sm.StartSession(1, "prof", 101, playback.PlayDirect, false)
	_ = sm.UpdateProgress(paused.ID, 50.0, true)

	// Let both sessions age past the base maxIdle but within the 3x
	// paused grace period. With 20ms maxIdle: cutoff = now-20ms,
	// pausedCutoff = now-60ms. After sleeping 50ms, sessions created
	// 50ms ago are older than cutoff (20ms) but newer than
	// pausedCutoff (60ms).
	time.Sleep(50 * time.Millisecond)

	expired := sm.CleanExpired(20 * time.Millisecond)

	// Only the playing session should be expired.
	if len(expired) != 1 {
		t.Fatalf("CleanExpired removed %d sessions, want 1", len(expired))
	}
	if expired[0].ID != playing.ID {
		t.Fatalf("expected playing session %s to be expired, got %s", playing.ID, expired[0].ID)
	}

	// Paused session should still exist.
	if _, err := sm.GetSession(paused.ID); err != nil {
		t.Errorf("paused session should survive with 3x grace period, got: %v", err)
	}
}