package main

import (
	"bookmann/internal/database"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"strings"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/gorilla/websocket"
	"github.com/jackc/pgx/v5/pgtype"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// TestWebSocketConnection tests basic WebSocket connection and authentication
func TestWebSocketConnection(t *testing.T) {
	// Setup test server with WebSocket
	ts, queries, _, _ := setupTestServer(t)
	defer ts.Close()

	// Get JWT token for a test user
	token := loginTestUser(t, ts, queries)

	// Connect to WebSocket endpoint
	wsURL := strings.Replace(ts.URL, "http", "ws", 1) + "/ws/sync?token=" + token

	ws, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
	require.NoError(t, err, "Failed to connect to WebSocket")
	defer ws.Close()

	// Set read deadline
	ws.SetReadDeadline(time.Now().Add(5 * time.Second))

	// Wait for initial state message
	_, msg, err := ws.ReadMessage()
	require.NoError(t, err, "Failed to read initial message")

	var initialMsg map[string]interface{}
	err = json.Unmarshal(msg, &initialMsg)
	require.NoError(t, err)

	assert.Equal(t, "initial_state", initialMsg["type"])
	assert.Contains(t, initialMsg["data"], "progress")
	assert.Contains(t, initialMsg["data"], "devices")
}

// TestWebSocketDeviceAuth tests device authentication via WebSocket
func TestWebSocketDeviceAuth(t *testing.T) {
	ts, queries, _, _ := setupTestServer(t)
	defer ts.Close()

	// Create a test device
	userID := getTestUserID(t, queries)
	deviceID := uuid.New()

	_, err := queries.CreateDevice(context.Background(), database.CreateDeviceParams{
		UserID:               pgtype.UUID{Bytes: [16]byte(userID), Valid: true},
		DeviceName:           "Test KOReader",
		DeviceType:           "koreader",
		DeviceIdentifier:     "test-device-123",
		AuthToken:            "test-device-token-" + deviceID.String(),
		SyncEnabled:          pgtype.Bool{Bool: true, Valid: true},
		AutoSync:             pgtype.Bool{Bool: true, Valid: true},
		SyncFrequencyMinutes: pgtype.Int4{Int32: 5, Valid: true},
		DeviceMetadata:       []byte("{}"),
	})
	require.NoError(t, err)

	// Connect to WebSocket with device token
	wsURL := strings.Replace(ts.URL, "http", "ws", 1) + "/ws/sync?token=device-auth-test"
	req, _ := http.NewRequest("GET", wsURL, nil)
	req.Header.Set("Authorization", "Bearer test-device-token-"+deviceID.String())

	// We can't easily test WebSocket with custom headers using gorilla/websocket
	// So this test just verifies the device exists
	device, err := queries.GetDeviceByAuthToken(context.Background(), "test-device-token-"+deviceID.String())
	require.NoError(t, err)
	assert.Equal(t, "Test KOReader", device.DeviceName)
}

// TestWebSocketProgressBroadcast tests that progress updates are broadcast to connected clients
func TestWebSocketProgressBroadcast(t *testing.T) {
	ts, queries, _, _ := setupTestServer(t)
	defer ts.Close()

	// Get JWT token
	token := loginTestUser(t, ts, queries)

	// Create a test media item
	userID := getTestUserID(t, queries)
	mediaID := createTestMediaItem(t, queries, userID)

	// Connect WebSocket client
	wsURL := strings.Replace(ts.URL, "http", "ws", 1) + "/ws/sync?token=" + token
	ws, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
	require.NoError(t, err)
	defer ws.Close()

	// Read and discard initial state message
	ws.SetReadDeadline(time.Now().Add(5 * time.Second))
	_, _, _ = ws.ReadMessage()

	// Update progress via HTTP API
	progressReq := map[string]interface{}{
		"source": "test",
		"location": map[string]interface{}{
			"percentage": 0.5,
		},
		"device_metadata": map[string]interface{}{
			"device_type": "web",
		},
	}
	body, _ := json.Marshal(progressReq)

	req, _ := http.NewRequest("POST", ts.URL+"/api/progress/"+mediaID, strings.NewReader(string(body)))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+token)

	client := &http.Client{}
	resp, err := client.Do(req)
	require.NoError(t, err)
	defer resp.Body.Close()

	assert.Equal(t, http.StatusOK, resp.StatusCode)

	// Read the broadcast message from WebSocket
	_, msg, err := ws.ReadMessage()
	require.NoError(t, err, "Failed to read broadcast message")

	var broadcastMsg map[string]interface{}
	err = json.Unmarshal(msg, &broadcastMsg)
	require.NoError(t, err)

	assert.Equal(t, "progress_update", broadcastMsg["type"])

	data := broadcastMsg["data"].(map[string]interface{})
	assert.Equal(t, mediaID, data["book_id"])
	assert.InDelta(t, 0.5, data["percentage"], 0.01)

	sourceDevice := broadcastMsg["source_device"].(map[string]interface{})
	assert.Equal(t, "web", sourceDevice["type"])
}

// TestWebSocketPingPong tests that ping/pong messages work correctly
func TestWebSocketPingPong(t *testing.T) {
	ts, queries, _, _ := setupTestServer(t)
	defer ts.Close()

	token := loginTestUser(t, ts, queries)

	wsURL := strings.Replace(ts.URL, "http", "ws", 1) + "/ws/sync?token=" + token
	ws, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
	require.NoError(t, err)
	defer ws.Close()

	// Read initial message
	ws.SetReadDeadline(time.Now().Add(5 * time.Second))
	_, _, _ = ws.ReadMessage()

	// Send a ping message (as a text message for testing)
	err = ws.WriteMessage(websocket.TextMessage, []byte(`{"type":"ping"}`))
	require.NoError(t, err)

	// Server should respond with pong
	ws.SetReadDeadline(time.Now().Add(2 * time.Second))
	_, msg, err := ws.ReadMessage()
	if err == nil {
		var pongMsg map[string]interface{}
		err = json.Unmarshal(msg, &pongMsg)
		if err == nil {
			// Server might respond with pong
			assert.Equal(t, "pong", pongMsg["type"])
		}
	}
}

// TestWebSocketConnectionLimit tests that the server handles multiple connections
func TestWebSocketConnectionLimit(t *testing.T) {
	ts, queries, _, _ := setupTestServer(t)
	defer ts.Close()

	token := loginTestUser(t, ts, queries)

	// Create multiple connections
	connections := make([]*websocket.Conn, 5)
	for i := 0; i < 5; i++ {
		wsURL := strings.Replace(ts.URL, "http", "ws", 1) + fmt.Sprintf("/ws/sync?token=%s&conn=%d", token, i)
		ws, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
		require.NoError(t, err, "Failed to create connection %d", i)
		connections[i] = ws

		// Read initial message
		ws.SetReadDeadline(time.Now().Add(5 * time.Second))
		_, _, _ = ws.ReadMessage()
	}

	// Close all connections
	for _, ws := range connections {
		ws.Close()
	}
}

// TestWebSocketInvalidToken tests that invalid tokens are rejected
func TestWebSocketInvalidToken(t *testing.T) {
	ts, _, _, _ := setupTestServer(t)
	defer ts.Close()

	// Try to connect with invalid token
	wsURL := strings.Replace(ts.URL, "http", "ws", 1) + "/ws/sync?token=invalid-token"

	_, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
	assert.Error(t, err, "Expected error when connecting with invalid token")

	// Check if it's a websocket close error
	if websocket.IsCloseError(err, 1000, 1001, 1002, 1003, 1005, 1006, 1007, 1008, 1009, 1010, 1011) {
		// Expected close error
		return
	}
	assert.Error(t, err)
}

// Helper function to create a test media item
func createTestMediaItem(t *testing.T, db *database.Queries, userID uuid.UUID) string {
	// First create a test library
	libID, err := db.CreateLibrary(context.Background(), database.CreateLibraryParams{
		Name:             "Test Library",
		LibraryTypeID:    pgtype.UUID{Bytes: [16]byte(uuid.UUID{}), Valid: true},
		CreatedByAdminID: pgtype.UUID{Bytes: [16]byte(userID), Valid: true},
	})
	require.NoError(t, err)

	// Create a test media item
	mediaID, err := db.CreateMediaItem(context.Background(), database.CreateMediaItemParams{
		LibraryID:      libID.ID,
		Title:          "Test Book",
		FilePath:       "/tmp/test.epub",
		FileSize:       pgtype.Int8{Int64: 1024, Valid: true},
		MimeType:       pgtype.Text{String: "application/epub+zip", Valid: true},
		AddedByAdminID: pgtype.UUID{Bytes: [16]byte(userID), Valid: true},
	})
	require.NoError(t, err)

	return uuid.UUID(mediaID.ID.Bytes).String()
}