package chat

import (
	"context"
	"encoding/json"
	"testing"
	"time"

	"veza-backend-api/internal/models"
	"veza-backend-api/internal/repositories"
	"veza-backend-api/internal/services"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"go.uber.org/zap/zaptest"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
)

func setupTestHandler(t *testing.T) (*MessageHandler, *Hub, *gorm.DB) {
	t.Helper()
	logger := zaptest.NewLogger(t)

	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	require.NoError(t, err)

	require.NoError(t, db.AutoMigrate(
		&models.ChatMessage{},
		&models.ReadReceipt{},
		&models.DeliveredStatus{},
		&models.MessageReaction{},
	))

	hub := NewHub(logger)
	go hub.Run()
	time.Sleep(10 * time.Millisecond)

	msgRepo := repositories.NewChatMessageRepository(db)
	readRepo := repositories.NewReadReceiptRepository(db)
	deliveredRepo := repositories.NewDeliveredStatusRepository(db)
	reactionRepo := repositories.NewReactionRepository(db)
	pubsub := services.NewChatPubSubService(nil, logger)
	permissions := &PermissionService{db: db, logger: logger}
	rateLimiter := NewRateLimiter()

	handler := NewMessageHandler(
		hub, msgRepo, readRepo, deliveredRepo, reactionRepo,
		pubsub, permissions, rateLimiter, logger,
	)

	return handler, hub, db
}

func TestHandleSendMessage_Success(t *testing.T) {
	handler, hub, db := setupTestHandler(t)
	ctx := context.Background()

	userID := uuid.New()
	roomID := uuid.New()

	db.Exec("CREATE TABLE IF NOT EXISTS room_members (user_id TEXT, room_id TEXT, role TEXT DEFAULT 'member', is_muted INTEGER DEFAULT 0)")
	db.Exec("INSERT INTO room_members (user_id, room_id, role, is_muted) VALUES (?, ?, 'member', 0)", userID, roomID)

	client := newTestClient(hub, userID)
	hub.Register(client)
	hub.JoinRoom(client, roomID)
	time.Sleep(20 * time.Millisecond)

	msg := &IncomingMessage{
		Type:           TypeSendMessage,
		ConversationID: &roomID,
		Content:        "Hello World",
	}

	handler.HandleSendMessage(ctx, client, msg)
	time.Sleep(20 * time.Millisecond)

	// Check we got ActionConfirmed and NewMessage broadcast
	assert.GreaterOrEqual(t, len(client.send), 1)

	// Verify message was stored in DB
	var count int64
	db.Model(&models.ChatMessage{}).Where("room_id = ?", roomID).Count(&count)
	assert.Equal(t, int64(1), count)
}

func TestHandleSendMessage_MissingConversationID(t *testing.T) {
	handler, hub, _ := setupTestHandler(t)
	ctx := context.Background()

	userID := uuid.New()
	client := newTestClient(hub, userID)
	hub.Register(client)
	time.Sleep(20 * time.Millisecond)

	msg := &IncomingMessage{
		Type:    TypeSendMessage,
		Content: "Hello",
	}

	handler.HandleSendMessage(ctx, client, msg)
	time.Sleep(20 * time.Millisecond)

	assert.Len(t, client.send, 1)
	resp := <-client.send
	var parsed map[string]interface{}
	json.Unmarshal(resp, &parsed)
	assert.Equal(t, TypeError, parsed["type"])
}

func TestHandleEditMessage_OwnershipCheck(t *testing.T) {
	handler, hub, db := setupTestHandler(t)
	ctx := context.Background()

	senderID := uuid.New()
	otherID := uuid.New()
	roomID := uuid.New()
	msgID := uuid.New()

	existingMsg := &models.ChatMessage{
		ID:             msgID,
		ConversationID: roomID,
		SenderID:       senderID,
		Content:        "original",
		MessageType:    "text",
		Status:         "sent",
		CreatedAt:      time.Now(),
		UpdatedAt:      time.Now(),
	}
	db.Create(existingMsg)

	otherClient := newTestClient(hub, otherID)
	hub.Register(otherClient)
	time.Sleep(20 * time.Millisecond)

	msg := &IncomingMessage{
		Type:           TypeEditMessage,
		MessageID:      &msgID,
		ConversationID: &roomID,
		NewContent:     "modified",
	}

	handler.HandleEditMessage(ctx, otherClient, msg)
	time.Sleep(20 * time.Millisecond)

	assert.Len(t, otherClient.send, 1)
	resp := <-otherClient.send
	var parsed map[string]interface{}
	json.Unmarshal(resp, &parsed)
	assert.Equal(t, TypeError, parsed["type"])
	assert.Contains(t, parsed["message"], "own messages")
}

func TestHandleDeleteMessage_SoftDelete(t *testing.T) {
	handler, hub, db := setupTestHandler(t)
	ctx := context.Background()

	userID := uuid.New()
	roomID := uuid.New()
	msgID := uuid.New()

	db.Exec("CREATE TABLE IF NOT EXISTS room_members (user_id TEXT, room_id TEXT, role TEXT DEFAULT 'member', is_muted INTEGER DEFAULT 0)")
	db.Exec("INSERT INTO room_members (user_id, room_id, role, is_muted) VALUES (?, ?, 'member', 0)", userID, roomID)

	existingMsg := &models.ChatMessage{
		ID:             msgID,
		ConversationID: roomID,
		SenderID:       userID,
		Content:        "to delete",
		MessageType:    "text",
		Status:         "sent",
		CreatedAt:      time.Now(),
		UpdatedAt:      time.Now(),
	}
	db.Create(existingMsg)

	client := newTestClient(hub, userID)
	hub.Register(client)
	hub.JoinRoom(client, roomID)
	time.Sleep(20 * time.Millisecond)

	msg := &IncomingMessage{
		Type:           TypeDeleteMessage,
		MessageID:      &msgID,
		ConversationID: &roomID,
	}

	handler.HandleDeleteMessage(ctx, client, msg)
	time.Sleep(20 * time.Millisecond)

	var deletedMsg models.ChatMessage
	db.Where("id = ?", msgID).First(&deletedMsg)
	assert.True(t, deletedMsg.IsDeleted)
}