package ws

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"github.com/alicebob/miniredis/v2"
	"github.com/gorilla/websocket"
	"github.com/redis/go-redis/v9"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/ThreeDotsLabs/watermill/message"

	wspkg "github.com/gochat/gochat/internal/ws"
)

// === NewHub tests ===

func TestNewHub_WithSubsystems(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	typing := wspkg.NewTypingTracker(rdb, relay)
	presence := wspkg.NewPresenceTracker(rdb, relay)
	pm := wspkg.NewPresenceManager(presence, wspkg.DefaultHeartbeatConfig())

	hub := NewHub(relay, typing, presence, pm)
	require.NotNil(t, hub)
	assert.NotNil(t, hub.clients)
	assert.NotNil(t, hub.rooms)
	assert.NotNil(t, hub.accounts)
	assert.NotNil(t, hub.commandChan)
	assert.Same(t, relay, hub.relay)
	assert.Same(t, typing, hub.typing)
	assert.Same(t, presence, hub.presence)
	assert.Same(t, pm, hub.presenceMgr)
}

// === Hub.Register with presenceMgr (contact path) ===

func TestHub_Register_ContactWithPresence(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	presence := wspkg.NewPresenceTracker(rdb, relay)
	pm := wspkg.NewPresenceManager(presence, wspkg.DefaultHeartbeatConfig())
	hub := NewHub(relay, nil, presence, pm)

	client := NewClient(0, 10, nil, hub)
	client.IsContact = true
	client.ContactID = 5
	client.PubsubToken = "token123"

	hub.Register(client)
	assert.Contains(t, hub.clients, client.ID)
	// Contacts only receive events addressed to their own pubsub token.
	assert.False(t, client.SubscribedRooms[accountRoomName(10)])
	assert.True(t, client.SubscribedRooms[pubsubTokenRoomName("token123")])

	hub.Unregister(client)
}

func TestHub_Register_AgentWithPresence(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	presence := wspkg.NewPresenceTracker(rdb, relay)
	pm := wspkg.NewPresenceManager(presence, wspkg.DefaultHeartbeatConfig())
	hub := NewHub(relay, nil, presence, pm)

	client := NewClient(1, 10, nil, hub)

	hub.Register(client)
	assert.Contains(t, hub.clients, client.ID)
	assert.NotNil(t, client.CancelPresence)

	hub.Unregister(client)
	assert.NotContains(t, hub.clients, client.ID)
}

// === Hub.processCommand tests ===

func TestProcessCommand_UnknownCommand(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "unknown_command"},
	})
	// Should not panic, no message sent
	select {
	case <-client.Send:
		t.Fatal("unexpected message for unknown command")
	default:
	}
}

// === Hub.handleSubscribe tests ===

func TestHubHandleSubscribe_AccountChannel(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.SubscribeData{
		Channel:   wspkg.ChannelAccount,
		AccountID: 10,
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "subscribe", Data: string(data)},
	})

	// Should receive subscribe confirmation
	select {
	case msg := <-client.Send:
		var resp wspkg.WSMessage
		err := json.Unmarshal(msg, &resp)
		require.NoError(t, err)
		assert.Equal(t, wspkg.EventSubscribeConfirm, resp.Event)
	default:
		t.Fatal("expected subscribe confirmation message")
	}

	// Client should be subscribed to account room
	roomName := accountRoomName(10)
	assert.True(t, client.SubscribedRooms[roomName])
}

func TestHubHandleSubscribe_ConversationChannel(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.SubscribeData{
		Channel:        wspkg.ChannelConversation,
		AccountID:      10,
		ConversationID: 42,
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "subscribe", Data: string(data)},
	})

	select {
	case msg := <-client.Send:
		var resp wspkg.WSMessage
		err := json.Unmarshal(msg, &resp)
		require.NoError(t, err)
		assert.Equal(t, wspkg.EventSubscribeConfirm, resp.Event)
	default:
		t.Fatal("expected subscribe confirmation message")
	}

	roomName := conversationRoomName(10, 42)
	assert.True(t, client.SubscribedRooms[roomName])
}

func TestHubHandleSubscribe_AccountMismatch(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.SubscribeData{
		Channel:   wspkg.ChannelAccount,
		AccountID: 999, // mismatch
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "subscribe", Data: string(data)},
	})

	select {
	case msg := <-client.Send:
		var resp wspkg.WSMessage
		err := json.Unmarshal(msg, &resp)
		require.NoError(t, err)
		assert.Equal(t, wspkg.EventSubscribeReject, resp.Event)
	default:
		t.Fatal("expected subscribe reject message")
	}
}

func TestHubHandleSubscribe_ConversationNoID(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.SubscribeData{
		Channel:   wspkg.ChannelConversation,
		AccountID: 10,
		// ConversationID omitted
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "subscribe", Data: string(data)},
	})

	select {
	case msg := <-client.Send:
		var resp wspkg.WSMessage
		err := json.Unmarshal(msg, &resp)
		require.NoError(t, err)
		assert.Equal(t, wspkg.EventSubscribeReject, resp.Event)
	default:
		t.Fatal("expected subscribe reject message")
	}
}

func TestHubHandleSubscribe_UnknownChannel(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.SubscribeData{
		Channel:   "UnknownChannel",
		AccountID: 10,
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "subscribe", Data: string(data)},
	})

	select {
	case msg := <-client.Send:
		var resp wspkg.WSMessage
		err := json.Unmarshal(msg, &resp)
		require.NoError(t, err)
		assert.Equal(t, wspkg.EventSubscribeReject, resp.Event)
	default:
		t.Fatal("expected subscribe reject message")
	}
}

func TestHubHandleSubscribe_InvalidData(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "subscribe", Data: "invalid json"},
	})

	// Should not send any message, just return
	select {
	case <-client.Send:
		t.Fatal("unexpected message for invalid subscribe data")
	default:
	}
}

// === Hub.handleUnsubscribe tests ===

func TestHubHandleUnsubscribe_AccountChannel(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	// First subscribe
	data, _ := json.Marshal(wspkg.SubscribeData{
		Channel:   wspkg.ChannelAccount,
		AccountID: 10,
	})
	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "subscribe", Data: string(data)},
	})
	<-client.Send // drain confirm

	// Now unsubscribe
	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "unsubscribe", Data: string(data)},
	})

	select {
	case msg := <-client.Send:
		var resp wspkg.WSMessage
		err := json.Unmarshal(msg, &resp)
		require.NoError(t, err)
		assert.Equal(t, wspkg.EventUnsubscribeConfirm, resp.Event)
	default:
		t.Fatal("expected unsubscribe confirmation message")
	}
}

func TestHubHandleUnsubscribe_ConversationChannel(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.SubscribeData{
		Channel:        wspkg.ChannelConversation,
		AccountID:      10,
		ConversationID: 42,
	})
	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "subscribe", Data: string(data)},
	})
	<-client.Send // drain confirm

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "unsubscribe", Data: string(data)},
	})

	select {
	case msg := <-client.Send:
		var resp wspkg.WSMessage
		err := json.Unmarshal(msg, &resp)
		require.NoError(t, err)
		assert.Equal(t, wspkg.EventUnsubscribeConfirm, resp.Event)
	default:
		t.Fatal("expected unsubscribe confirmation message")
	}
}

func TestHubHandleUnsubscribe_UnknownChannel(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.SubscribeData{
		Channel:   "UnknownChannel",
		AccountID: 10,
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "unsubscribe", Data: string(data)},
	})

	// Unknown channel — should return without sending
	select {
	case <-client.Send:
		t.Fatal("unexpected message for unknown channel unsubscribe")
	default:
	}
}

func TestHubHandleUnsubscribe_InvalidData(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "unsubscribe", Data: "invalid json"},
	})

	select {
	case <-client.Send:
		t.Fatal("unexpected message for invalid unsubscribe data")
	default:
	}
}

// === Hub.handlePing tests ===

func TestHubHandlePing(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "ping", Data: ""},
	})

	select {
	case msg := <-client.Send:
		var resp wspkg.WSMessage
		err := json.Unmarshal(msg, &resp)
		require.NoError(t, err)
		assert.Equal(t, wspkg.EventPingResponse, resp.Event)
	default:
		t.Fatal("expected ping response message")
	}
}

// === Hub.handleTypingOn tests ===

func TestHubHandleTypingOn_NilTyping(t *testing.T) {
	hub := NewHubSimple() // no typing tracker
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.TypingData{
		ConversationID: 42,
		AccountID:      10,
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "typing_on", Data: string(data)},
	})
	// Should return early without panic
}

func TestHubHandleTypingOn_WithTypingTracker(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	typing := wspkg.NewTypingTracker(rdb, relay)
	hub := NewHub(nil, typing, nil, nil)

	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.TypingData{
		ConversationID: 42,
		AccountID:      10,
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "typing_on", Data: string(data)},
	})
	// Should not panic
}

func TestHubHandleTypingOn_InvalidData(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	typing := wspkg.NewTypingTracker(rdb, relay)
	hub := NewHub(nil, typing, nil, nil)

	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "typing_on", Data: "invalid json"},
	})
	// Should not panic
}

func TestHubHandleTypingOn_ContactClient(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	typing := wspkg.NewTypingTracker(rdb, relay)
	hub := NewHub(nil, typing, nil, nil)

	client := NewClient(0, 10, nil, hub)
	client.IsContact = true
	client.ContactID = 5
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.TypingData{
		ConversationID: 42,
		AccountID:      10,
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "typing_on", Data: string(data)},
	})
}

// === Hub.handleTypingOff tests ===

func TestHubHandleTypingOff_NilTyping(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.TypingData{
		ConversationID: 42,
		AccountID:      10,
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "typing_off", Data: string(data)},
	})
}

func TestHubHandleTypingOff_WithTypingTracker(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	typing := wspkg.NewTypingTracker(rdb, relay)
	hub := NewHub(nil, typing, nil, nil)

	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.TypingData{
		ConversationID: 42,
		AccountID:      10,
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "typing_off", Data: string(data)},
	})
}

func TestHubHandleTypingOff_InvalidData(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	typing := wspkg.NewTypingTracker(rdb, relay)
	hub := NewHub(nil, typing, nil, nil)

	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "typing_off", Data: "invalid json"},
	})
}

func TestHubHandleTypingOff_ContactClient(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	typing := wspkg.NewTypingTracker(rdb, relay)
	hub := NewHub(nil, typing, nil, nil)

	client := NewClient(0, 10, nil, hub)
	client.IsContact = true
	client.ContactID = 5
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.TypingData{
		ConversationID: 42,
		AccountID:      10,
	})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "typing_off", Data: string(data)},
	})
}

// === Hub.handleUpdatePresence tests ===

func TestHubHandleUpdatePresence_NilPresence(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.PresenceData{Status: "online"})

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "update_presence", Data: string(data)},
	})
}

func TestHubHandleUpdatePresence_Online(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	presence := wspkg.NewPresenceTracker(rdb, relay)
	hub := NewHub(nil, nil, presence, nil)

	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.PresenceData{Status: "online"})
	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "update_presence", Data: string(data)},
	})
}

func TestHubHandleUpdatePresence_Busy(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	presence := wspkg.NewPresenceTracker(rdb, relay)
	hub := NewHub(nil, nil, presence, nil)

	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.PresenceData{Status: "busy"})
	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "update_presence", Data: string(data)},
	})
}

func TestHubHandleUpdatePresence_Offline(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	presence := wspkg.NewPresenceTracker(rdb, relay)
	hub := NewHub(nil, nil, presence, nil)

	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.PresenceData{Status: "offline"})
	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "update_presence", Data: string(data)},
	})
}

func TestHubHandleUpdatePresence_UnknownStatus(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	presence := wspkg.NewPresenceTracker(rdb, relay)
	hub := NewHub(nil, nil, presence, nil)

	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	data, _ := json.Marshal(wspkg.PresenceData{Status: "unknown"})
	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "update_presence", Data: string(data)},
	})
}

func TestHubHandleUpdatePresence_InvalidData(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	presence := wspkg.NewPresenceTracker(rdb, relay)
	hub := NewHub(nil, nil, presence, nil)

	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	hub.processCommand(&ClientCommand{
		Client: client,
		Cmd:    wspkg.WSCommand{Command: "update_presence", Data: "invalid json"},
	})
}

// === Hub.Run with command processing ===

func TestHub_Run_ProcessesCommands(t *testing.T) {
	hub := NewHubSimple()
	ctx, cancel := context.WithCancel(context.Background())

	go hub.Run(ctx)

	client := NewClient(1, 10, nil, hub)
	hub.Register(client)

	// Submit a ping command via SubmitCommand (goes through the event loop)
	hub.SubmitCommand(client, wspkg.WSCommand{Command: "ping", Data: ""})

	// Wait for the ping response
	select {
	case msg := <-client.Send:
		var resp wspkg.WSMessage
		err := json.Unmarshal(msg, &resp)
		require.NoError(t, err)
		assert.Equal(t, wspkg.EventPingResponse, resp.Event)
	case <-time.After(2 * time.Second):
		t.Fatal("did not receive ping response from event loop")
	}

	hub.Unregister(client)
	cancel()
}

// === Hub.shutdown with clients (with CancelPresence) ===

func TestHub_Shutdown_WithCancelPresence(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	relay := wspkg.NewBroadcastRelay(rdb, nil)
	presence := wspkg.NewPresenceTracker(rdb, relay)
	pm := wspkg.NewPresenceManager(presence, wspkg.DefaultHeartbeatConfig())
	hub := NewHub(relay, nil, presence, pm)

	// Register an agent client — this will start the presence refresh loop
	// Use a dummy websocket connection to avoid nil panic in shutdown()
	server, clientConn := newTestWSConn(t)
	defer server.Close()
	client := NewClient(1, 10, clientConn, hub)
	hub.Register(client)
	// CancelPresence is set by Register when presenceMgr != nil
	require.NotNil(t, client.CancelPresence)

	// Shutdown should call CancelPresence and close Send
	hub.Shutdown(context.Background())
	assert.Empty(t, hub.clients)
}

// === SendToAccount with slow client (drop path) ===

func TestHub_SendToAccount_SlowClient(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	client.Identifier = `{"channel":"AccountChannel","account_id":10}`
	hub.Register(client)

	// Fill the Send channel buffer
	for i := 0; i < SendChannelSize; i++ {
		client.Send <- []byte("fill")
	}

	// Now send — should be dropped, not block
	hub.SendToAccount(10, []byte(`{"event":"test"}`))
	// If we reach here, it didn't block
}

func TestHub_SendToAccountConversation_SlowClient(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	client.Identifier = `{"channel":"ConversationChannel","account_id":10,"conversation_id":5}`
	hub.Register(client)
	room := conversationRoomName(10, 5)
	hub.subscribeClient(client.ID, room)
	client.SubscribedRooms[room] = true

	// Fill the Send channel
	for i := 0; i < SendChannelSize; i++ {
		client.Send <- []byte("fill")
	}

	hub.SendToAccountConversation(10, 5, []byte(`{"event":"test"}`))
}

func TestHub_SendToRoom_SlowClient(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	client.Identifier = `{"channel":"RoomChannel"}`
	hub.Register(client)
	hub.subscribeClient(client.ID, "custom_room")
	client.SubscribedRooms["custom_room"] = true

	for i := 0; i < SendChannelSize; i++ {
		client.Send <- []byte("fill")
	}

	hub.SendToRoom("custom_room", []byte(`{"event":"test"}`))
}

func TestHub_SendToClient_SlowClient(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	client.Identifier = `{"channel":"AccountChannel"}`
	hub.Register(client)

	for i := 0; i < SendChannelSize; i++ {
		client.Send <- []byte("fill")
	}

	hub.SendToClient(client.ID, []byte(`{"event":"test"}`))
}

// === SendToClient with no identifier ===

func TestHub_SendToClient_NoIdentifier(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	// No Identifier set
	hub.Register(client)

	hub.SendToClient(client.ID, []byte(`{"event":"test"}`))
	// Should be skipped (wrapActionCableMessage returns nil)
	select {
	case <-client.Send:
		// Could have the welcome or other messages, but the SendToClient should not add
	default:
	}
}

// === Subscriber tests ===

func TestNewSubscriber(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})

	hub := NewHubSimple()
	sub, err := NewSubscriber(hub, rdb)
	require.NoError(t, err)
	require.NotNil(t, sub)
	assert.NotNil(t, sub.hub)
	assert.NotNil(t, sub.subscriber)
	assert.NotNil(t, sub.router)
	assert.NotNil(t, sub.redisClient)
}

func TestNewSubscriber_InvalidRedis(t *testing.T) {
	// Use a non-existent redis address — the subscriber creation may still succeed
	// because watermill is lazy, but let's test the path
	rdb := redis.NewClient(&redis.Options{Addr: "127.0.0.1:1"}) // port 1 won't connect

	hub := NewHubSimple()
	// NewSubscriber should still succeed — it doesn't connect until Run
	sub, err := NewSubscriber(hub, rdb)
	if err != nil {
		// If it fails, that's also acceptable — we're testing the error path
		assert.Nil(t, sub)
		return
	}
	require.NotNil(t, sub)
}

func TestSubscriber_Running(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})

	hub := NewHubSimple()
	sub, err := NewSubscriber(hub, rdb)
	require.NoError(t, err)

	// Not running yet
	assert.False(t, sub.Running())
}

func TestSubscriber_Close(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})

	hub := NewHubSimple()
	sub, err := NewSubscriber(hub, rdb)
	require.NoError(t, err)

	// Run the router in a goroutine so Close can work properly
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	go func() { _ = sub.Run(ctx) }()

	// Give it a moment to start
	time.Sleep(100 * time.Millisecond)

	// Close should work
	done := make(chan error, 1)
	go func() { done <- sub.Close() }()
	select {
	case err := <-done:
		_ = err
	case <-time.After(5 * time.Second):
		t.Fatal("subscriber.Close() timed out")
	}
}

func TestSubscriber_Close_Twice(t *testing.T) {
	mr := miniredis.RunT(t)
	defer mr.Close()
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})

	hub := NewHubSimple()
	sub, err := NewSubscriber(hub, rdb)
	require.NoError(t, err)

	// Run the router so Close works
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	go func() { _ = sub.Run(ctx) }()
	time.Sleep(100 * time.Millisecond)

	// First close
	done := make(chan error, 1)
	go func() { done <- sub.Close() }()
	select {
	case <-done:
	case <-time.After(5 * time.Second):
		t.Fatal("first Close timed out")
	}

	// Second close should handle "already closed" gracefully
	done2 := make(chan error, 1)
	go func() { done2 <- sub.Close() }()
	select {
	case err := <-done2:
		assert.NoError(t, err)
	case <-time.After(5 * time.Second):
		t.Fatal("second Close timed out")
	}
}

// === extractPayload tests ===

func TestExtractPayload_Valid(t *testing.T) {
	payloadJSON := `{"account_id":10,"conversation_id":42,"data":{"key":"value"}}`
	msg := message.NewMessage("test-id", []byte(payloadJSON))

	payload, err := extractPayload(msg)
	require.NoError(t, err)
	require.NotNil(t, payload)
	assert.Equal(t, uint(10), payload.AccountID)
	assert.Equal(t, uint(42), payload.ConversationID)
}

func TestExtractPayload_InvalidJSON(t *testing.T) {
	msg := message.NewMessage("test-id", []byte("invalid json"))

	payload, err := extractPayload(msg)
	require.Error(t, err)
	assert.Nil(t, payload)
}

func TestExtractPayload_Empty(t *testing.T) {
	msg := message.NewMessage("test-id", []byte("{}"))

	payload, err := extractPayload(msg)
	require.NoError(t, err)
	assert.Equal(t, uint(0), payload.AccountID)
}

// === forwardToAccountAndConversation tests ===

func TestForwardToAccountAndConversation_Valid(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	client.Identifier = `{"channel":"AccountChannel","account_id":10}`
	hub.Register(client)

	// Also subscribe to conversation room
	convRoom := conversationRoomName(10, 42)
	hub.subscribeClient(client.ID, convRoom)
	client.SubscribedRooms[convRoom] = true

	sub := &Subscriber{hub: hub}

	payloadJSON := `{"account_id":10,"conversation_id":42,"data":{"message":"hello"}}`
	msg := message.NewMessage("test-id", []byte(payloadJSON))

	handler := sub.forwardToAccountAndConversation(EventMessageCreated)
	err := handler(msg)
	require.NoError(t, err)

	// Should receive message on account room
	<-client.Send // may have welcome or prior messages, drain
	// Try to read the forwarded message
	// Since the client.Send channel is buffered, we should get messages
}

func TestForwardToAccountAndConversation_MissingAccountID(t *testing.T) {
	hub := NewHubSimple()
	sub := &Subscriber{hub: hub}

	payloadJSON := `{"account_id":0,"conversation_id":42,"data":{}}`
	msg := message.NewMessage("test-id", []byte(payloadJSON))

	handler := sub.forwardToAccountAndConversation(EventMessageCreated)
	err := handler(msg)
	require.NoError(t, err) // returns nil even on missing account_id
}

func TestForwardToAccountAndConversation_InvalidPayload(t *testing.T) {
	hub := NewHubSimple()
	sub := &Subscriber{hub: hub}

	msg := message.NewMessage("test-id", []byte("invalid json"))

	handler := sub.forwardToAccountAndConversation(EventMessageCreated)
	err := handler(msg)
	require.NoError(t, err) // returns nil on bad payload
}

func TestForwardToAccountAndConversation_NoConversationID(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	client.Identifier = `{"channel":"AccountChannel","account_id":10}`
	hub.Register(client)

	sub := &Subscriber{hub: hub}

	payloadJSON := `{"account_id":10,"data":{"key":"value"}}`
	msg := message.NewMessage("test-id", []byte(payloadJSON))

	handler := sub.forwardToAccountAndConversation(EventMessageCreated)
	err := handler(msg)
	require.NoError(t, err)
}

// === forwardToAccount tests ===

func TestForwardToAccount_Valid(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	client.Identifier = `{"channel":"AccountChannel","account_id":10}`
	hub.Register(client)

	sub := &Subscriber{hub: hub}

	payloadJSON := `{"account_id":10,"data":{"key":"value"}}`
	msg := message.NewMessage("test-id", []byte(payloadJSON))

	handler := sub.forwardToAccount(EventConversationCreated)
	err := handler(msg)
	require.NoError(t, err)
}

func TestForwardToAccount_MissingAccountID(t *testing.T) {
	hub := NewHubSimple()
	sub := &Subscriber{hub: hub}

	payloadJSON := `{"account_id":0,"data":{}}`
	msg := message.NewMessage("test-id", []byte(payloadJSON))

	handler := sub.forwardToAccount(EventConversationCreated)
	err := handler(msg)
	require.NoError(t, err)
}

func TestForwardToAccount_InvalidPayload(t *testing.T) {
	hub := NewHubSimple()
	sub := &Subscriber{hub: hub}

	msg := message.NewMessage("test-id", []byte("invalid json"))

	handler := sub.forwardToAccount(EventConversationCreated)
	err := handler(msg)
	require.NoError(t, err)
}

// === forwardToConversation tests ===

func TestForwardToConversation_Valid(t *testing.T) {
	hub := NewHubSimple()
	client := NewClient(1, 10, nil, hub)
	client.Identifier = `{"channel":"ConversationChannel","account_id":10,"conversation_id":42}`
	hub.Register(client)
	convRoom := conversationRoomName(10, 42)
	hub.subscribeClient(client.ID, convRoom)
	client.SubscribedRooms[convRoom] = true

	sub := &Subscriber{hub: hub}

	payloadJSON := `{"account_id":10,"conversation_id":42,"data":{"key":"value"}}`
	msg := message.NewMessage("test-id", []byte(payloadJSON))

	handler := sub.forwardToConversation(EventAgentTypingOn)
	err := handler(msg)
	require.NoError(t, err)
}

func TestForwardToConversation_MissingAccountID(t *testing.T) {
	hub := NewHubSimple()
	sub := &Subscriber{hub: hub}

	payloadJSON := `{"account_id":0,"conversation_id":42,"data":{}}`
	msg := message.NewMessage("test-id", []byte(payloadJSON))

	handler := sub.forwardToConversation(EventAgentTypingOn)
	err := handler(msg)
	require.NoError(t, err)
}

func TestForwardToConversation_MissingConversationID(t *testing.T) {
	hub := NewHubSimple()
	sub := &Subscriber{hub: hub}

	payloadJSON := `{"account_id":10,"conversation_id":0,"data":{}}`
	msg := message.NewMessage("test-id", []byte(payloadJSON))

	handler := sub.forwardToConversation(EventAgentTypingOn)
	err := handler(msg)
	require.NoError(t, err)
}

func TestForwardToConversation_InvalidPayload(t *testing.T) {
	hub := NewHubSimple()
	sub := &Subscriber{hub: hub}

	msg := message.NewMessage("test-id", []byte("invalid json"))

	handler := sub.forwardToConversation(EventAgentTypingOn)
	err := handler(msg)
	require.NoError(t, err)
}

// === watermillZapAdapter tests ===

func TestWatermillZapAdapter_Error(t *testing.T) {
	adapter := &watermillZapAdapter{}
	adapter.Error("test error", assert.AnError, nil)
	adapter.Error("test no error", nil, nil)
}

func TestWatermillZapAdapter_Info(t *testing.T) {
	adapter := &watermillZapAdapter{}
	adapter.Info("test info", nil)
}

func TestWatermillZapAdapter_Debug(t *testing.T) {
	adapter := &watermillZapAdapter{}
	adapter.Debug("test debug", nil)
}

func TestWatermillZapAdapter_Trace(t *testing.T) {
	adapter := &watermillZapAdapter{}
	adapter.Trace("test trace", nil)
}

func TestWatermillZapAdapter_With(t *testing.T) {
	adapter := &watermillZapAdapter{}
	newAdapter := adapter.With(nil)
	assert.NotNil(t, newAdapter)
}

// === Handler.handleUnsubscribe with invalid identifier ===

// newTestWSConn creates a pair of connected websocket connections for testing.
// Returns the server side and the client side.
func newTestWSConn(t *testing.T) (*websocket.Conn, *websocket.Conn) {
	t.Helper()
	upgrader := websocket.Upgrader{
		CheckOrigin: func(r *http.Request) bool { return true },
	}
	serverConn := make(chan *websocket.Conn, 1)
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		conn, err := upgrader.Upgrade(w, r, nil)
		if err != nil {
			return
		}
		serverConn <- conn
	}))
	t.Cleanup(srv.Close)

	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http")
	dialer := websocket.Dialer{HandshakeTimeout: 2 * time.Second}
	clientConn, _, err := dialer.Dial(wsURL, nil)
	require.NoError(t, err)

	select {
	case conn := <-serverConn:
		return conn, clientConn
	case <-time.After(2 * time.Second):
		clientConn.Close()
		t.Fatal("server connection was not established")
		return nil, nil
	}
}

func TestHandlerHandleUnsubscribe_InvalidIdentifier(t *testing.T) {
	hub := NewHubSimple()
	h := &Handler{hub: hub}
	client := NewClient(1, 10, nil, hub)
	hub.Register(client)
	defer hub.Unregister(client)

	// Call handleUnsubscribe with invalid identifier JSON
	h.handleUnsubscribe(client, CommandFrame{
		Command:    CommandUnsubscribe,
		Identifier: "invalid json",
	})
	// Should return without sending confirmation
}