quickview/main.go at main · tyrm/quickview · GitHub

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package main

import (
	"encoding/base64"
	"flag"
	"fmt"
	"html/template"
	"io"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/fsnotify/fsnotify"
	"github.com/gorilla/websocket"
	"github.com/patrickmn/go-cache"
)

// Quickview - Real-time media viewer with customizable grid layouts

type App struct {
	images        map[string]string // position -> base64 image
	filenames     map[string]string // position -> filename
	imageCount    int               // total images loaded
	mu            sync.RWMutex
	clients       []*Client
	clientsMu     sync.RWMutex
	filenameCache *cache.Cache
}

type Client struct {
	conn       *websocket.Conn
	id         int
	gridWidth  int
	gridHeight int
	frames     int
	paused     map[string]bool
	pausedMu   sync.RWMutex
}

type Message struct {
	Type     string `json:"type"`
	Position string `json:"position"`
	Paused   bool   `json:"paused"`
}

var upgrader = websocket.Upgrader{
	CheckOrigin: func(r *http.Request) bool {
		return true
	},
}

var nextClientID int
var clientIDMu sync.Mutex

var htmlTemplate = `
<!DOCTYPE html>
<html>
<head>
    <title>Quickview</title>
    <style>
        /* Grid layout */
        body {
            margin: 0;
            padding: 0;
            display: grid;
            grid-template-columns: repeat({{.GridWidth}}, 1fr);
            grid-template-rows: repeat({{.GridHeight}}, 1fr);
            height: 100vh;
            background: #222;
            font-family: Arial, sans-serif;
            overflow: hidden;
        }

        .image-container {
            position: relative;
            overflow: hidden;
            border: 2px solid #444;
            box-sizing: border-box;
            cursor: pointer;
            transition: border-color 0.3s;
        }

        .image-container.paused {
            border-color: #f44;
        }

        img, video {
            width: 100%;
            height: 100%;
            object-fit: {{.ObjectFit}};
            opacity: 1;
            transition: opacity 0.3s ease-in-out;
        }

        img.fade-out, video.fade-out {
            opacity: 0;
        }

        .empty {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: #666;
            text-align: center;
        }

        .pause-indicator {
            position: absolute;
            top: 10px;
            right: 10px;
            background: rgba(244, 67, 54, 0.9);
            color: white;
            padding: 5px 10px;
            border-radius: 3px;
            font-size: 12px;
            opacity: 0;
            transition: opacity 0.3s;
        }

        .image-container.paused .pause-indicator {
            opacity: 1;
        }

        .status {
            position: absolute;
            top: 10px;
            left: 10px;
            padding: 5px 10px;
            background: rgba(0, 0, 0, 0.7);
            color: #0f0;
            border-radius: 3px;
            font-size: 12px;
            z-index: 10;
        }

        .status.disconnected {
            color: #f00;
        }

        .filename {
            position: absolute;
            bottom: 10px;
            left: 10px;
            padding: 5px 10px;
            background: rgba(0, 0, 0, 0.7);
            color: #fff;
            border-radius: 3px;
            font-size: 12px;
        }
    </style>
</head>
<body>
    {{range .Positions}}
    <div class="image-container" data-position="{{.}}">
        <img id="{{.}}-image" style="display: none;" alt="{{.}}">
        <video id="{{.}}-video" style="display: none;" autoplay muted loop playsinline></video>
        <div id="{{.}}-empty" class="empty">Waiting for media...<br><small>Click to pause</small></div>
        <div class="pause-indicator">PAUSED</div>
        <div id="{{.}}-filename" class="filename" style="display: none;"></div>
    </div>
    {{end}}

    <div id="status" class="status">Connecting...</div>

    <script>
        let ws;
        let reconnectTimeout;
        let pausedFrames = new Set();

        function updateImage(position, imageData, filename) {
            const container = document.querySelector('[data-position="' + position + '"]');
            const img = document.getElementById(position + '-image');
            const video = document.getElementById(position + '-video');
            const empty = document.getElementById(position + '-empty');
            const filenameEl = document.getElementById(position + '-filename');

            if (imageData && !pausedFrames.has(position)) {
                // Determine if this is a video based on filename
                const isVideo = filename && filename.toLowerCase().endsWith('.mp4');

                // Fade out current content
                img.classList.add('fade-out');
                video.classList.add('fade-out');

                setTimeout(() => {
                    if (isVideo) {
                        // Clean up previous video to free memory
                        if (video.src) {
                            video.pause();
                            video.removeAttribute('src');
                            video.load();
                        }

                        // Hide image, show video
                        img.style.display = 'none';
                        video.src = 'data:video/mp4;base64,' + imageData;
                        video.style.display = 'block';
                        empty.style.display = 'none';
                        video.classList.remove('fade-out');
                    } else {
                        // Clean up video if it was playing
                        if (video.style.display === 'block') {
                            video.pause();
                            video.removeAttribute('src');
                            video.load();
                        }

                        // Hide video, show image
                        video.style.display = 'none';
                        img.src = 'data:image/png;base64,' + imageData;
                        img.style.display = 'block';
                        empty.style.display = 'none';
                        img.classList.remove('fade-out');
                    }

                    // Update filename if provided
                    if (filename && filenameEl) {
                        filenameEl.textContent = filename;
                        filenameEl.style.display = 'block';
                    }
                }, 300);
            }
        }

        function togglePause(position) {
            const container = document.querySelector('[data-position="' + position + '"]');
            const video = document.getElementById(position + '-video');
            const isPaused = pausedFrames.has(position);

            if (isPaused) {
                pausedFrames.delete(position);
                container.classList.remove('paused');
                // Resume video if present
                if (video.style.display === 'block') {
                    video.play();
                }
            } else {
                pausedFrames.add(position);
                container.classList.add('paused');
                // Pause video if present
                if (video.style.display === 'block') {
                    video.pause();
                }
            }

            // Send pause state to server
            if (ws && ws.readyState === WebSocket.OPEN) {
                ws.send(JSON.stringify({
                    type: 'pause',
                    position: position,
                    paused: !isPaused
                }));
            }
        }

        function connect() {
            const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
            ws = new WebSocket(protocol + '//' + window.location.host + '/ws?width={{.GridWidth}}&height={{.GridHeight}}');

            ws.onopen = () => {
                console.log('WebSocket connected');
                document.getElementById('status').textContent = 'Connected';
                document.getElementById('status').classList.remove('disconnected');
            };

            ws.onmessage = (event) => {
                const data = JSON.parse(event.data);

                if (data.type === 'init') {
                    // Update window title with ID
                    document.title = 'Quickview - Window ' + data.clientId;
                } else if (data.type === 'image') {
                    updateImage(data.position, data.image, data.filename);
                } else if (data.type === 'windowCount') {
                    // Window count is no longer displayed
                }
            };

            ws.onclose = () => {
                console.log('WebSocket disconnected');
                document.getElementById('status').textContent = 'Disconnected';
                document.getElementById('status').classList.add('disconnected');

                clearTimeout(reconnectTimeout);
                reconnectTimeout = setTimeout(connect, 2000);
            };

            ws.onerror = (error) => {
                console.error('WebSocket error:', error);
            };
        }

        // Add click handlers
        document.querySelectorAll('.image-container').forEach(container => {
            container.addEventListener('click', () => {
                const position = container.dataset.position;
                togglePause(position);
            });
        });

        // Add window unload handler to clean up videos
        window.addEventListener('beforeunload', () => {
            // Clean up all videos before leaving
            document.querySelectorAll('video').forEach(video => {
                video.pause();
                video.removeAttribute('src');
                video.load();
            });
        });

        connect();
    </script>
</body>
</html>
`

func main() {
	watchDir := flag.String("dir", ".", "Directory to watch for media files")
	extensions := flag.String("ext", "png,jpg,jpeg,gif,mp4", "File extensions to watch (comma separated)")
	port := flag.String("port", "8080", "Port for web server")
	defaultWidth := flag.Int("width", 3, "Default grid width (1-10)")
	defaultHeight := flag.Int("height", 1, "Default grid height (1-10)")
	flag.Parse()

	extList := strings.Split(*extensions, ",")
	for i := range extList {
		extList[i] = "." + strings.TrimSpace(extList[i])
	}

	app := &App{
		images:        make(map[string]string),
		filenames:     make(map[string]string),
		imageCount:    0,
		clients:       make([]*Client, 0),
		filenameCache: cache.New(1*time.Second, 2*time.Second),
	}

	go app.watchFolder(*watchDir, extList)

	tmpl := template.Must(template.New("viewer").Parse(htmlTemplate))

	// Serve HTML page with grid dimensions
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		widthStr := r.URL.Query().Get("width")
		heightStr := r.URL.Query().Get("height")

		// Default to configured grid size
		gridWidth := *defaultWidth
		gridHeight := *defaultHeight

		if widthStr != "" {
			if w, err := strconv.Atoi(widthStr); err == nil && w > 0 && w <= 10 {
				gridWidth = w
			}
		}

		if heightStr != "" {
			if h, err := strconv.Atoi(heightStr); err == nil && h > 0 && h <= 10 {
				gridHeight = h
			}
		}

		objectFit := r.URL.Query().Get("fit")
		if objectFit == "" {
			objectFit = "cover"
		}

		// Generate position names for the grid
		positions := make([]string, 0, gridWidth*gridHeight)
		for row := 0; row < gridHeight; row++ {
			for col := 0; col < gridWidth; col++ {
				positions = append(positions, fmt.Sprintf("r%dc%d", row, col))
			}
		}

		data := struct {
			GridWidth  int
			GridHeight int
			Positions  []string
			ObjectFit  string
		}{
			GridWidth:  gridWidth,
			GridHeight: gridHeight,
			Positions:  positions,
			ObjectFit:  objectFit,
		}

		tmpl.Execute(w, data)
	})

	// WebSocket endpoint
	http.HandleFunc("/ws", func(w http.ResponseWriter, r *http.Request) {
		conn, err := upgrader.Upgrade(w, r, nil)
		if err != nil {
			log.Printf("WebSocket upgrade error: %v", err)
			return
		}
		defer conn.Close()

		widthStr := r.URL.Query().Get("width")
		heightStr := r.URL.Query().Get("height")

		// Default to configured grid size
		gridWidth := *defaultWidth
		gridHeight := *defaultHeight

		if widthStr != "" {
			if w, err := strconv.Atoi(widthStr); err == nil && w > 0 && w <= 10 {
				gridWidth = w
			}
		}

		if heightStr != "" {
			if h, err := strconv.Atoi(heightStr); err == nil && h > 0 && h <= 10 {
				gridHeight = h
			}
		}

		frames := gridWidth * gridHeight

		clientIDMu.Lock()
		clientID := nextClientID
		nextClientID++
		clientIDMu.Unlock()

		client := &Client{
			conn:       conn,
			id:         clientID,
			gridWidth:  gridWidth,
			gridHeight: gridHeight,
			frames:     frames,
			paused:     make(map[string]bool),
		}

		// Send client ID
		conn.WriteJSON(map[string]interface{}{
			"type":     "init",
			"clientId": clientID,
		})

		app.clientsMu.Lock()
		app.clients = append(app.clients, client)
		clientCount := len(app.clients)
		app.clientsMu.Unlock()

		// Broadcast window count to all clients
		app.broadcastWindowCount(clientCount)

		app.sendCurrentImages(client)

		// Handle messages from client
		for {
			var msg Message
			err := conn.ReadJSON(&msg)
			if err != nil {
				break
			}

			if msg.Type == "pause" {
				client.pausedMu.Lock()
				client.paused[msg.Position] = msg.Paused
				client.pausedMu.Unlock()
			}
		}

		// Remove client on disconnect
		app.clientsMu.Lock()
		for i, c := range app.clients {
			if c == client {
				app.clients = append(app.clients[:i], app.clients[i+1:]...)
				break
			}
		}
		newClientCount := len(app.clients)
		app.clientsMu.Unlock()

		// Broadcast updated window count
		app.broadcastWindowCount(newClientCount)
	})

	fmt.Printf("Starting Quickview on http://localhost:%s\n", *port)
	fmt.Printf("Watching %s for files with extensions: %v\n", *watchDir, extList)
	fmt.Printf("Default grid: %dx%d\n", *defaultWidth, *defaultHeight)
	fmt.Println("\nGrid dimensions (use ?width=X&height=Y in URL):")
	fmt.Printf("  Default: http://localhost:%s (%dx%d grid)\n", *port, *defaultWidth, *defaultHeight)
	fmt.Println("  Examples:")
	fmt.Println("    2x2 grid: http://localhost:" + *port + "/?width=2&height=2")
	fmt.Println("    4x3 grid: http://localhost:" + *port + "/?width=4&height=3")
	fmt.Println("    1x4 vertical: http://localhost:" + *port + "/?width=1&height=4")
	fmt.Println("  Maximum: 10x10 grid")
	fmt.Println("\nMedia fit options (add &fit= to URL):")
	fmt.Println("  cover (default) - fills frame, crops if needed")
	fmt.Println("  contain - shows entire media, may have bars")
	fmt.Println("  fill - stretches to fill")
	fmt.Println("  scale-down - like contain but never enlarges")
	fmt.Println("\nExample: http://localhost:" + *port + "/?width=3&height=2&fit=contain")
	fmt.Println("\nSupported media: Images (png, jpg, jpeg, gif) and Videos (mp4)")
	fmt.Println("Videos play automatically, muted, and loop")

	log.Fatal(http.ListenAndServe(":"+*port, nil))
}

func (a *App) broadcastWindowCount(count int) {
	a.clientsMu.RLock()
	defer a.clientsMu.RUnlock()

	for _, client := range a.clients {
		client.conn.WriteJSON(map[string]interface{}{
			"type":  "windowCount",
			"count": count,
		})
	}
}

func (a *App) sendCurrentImages(client *Client) {
	a.mu.RLock()
	defer a.mu.RUnlock()

	positions := a.getPositionsForGrid(client.gridWidth, client.gridHeight)
	for _, position := range positions {
		if image, exists := a.images[position]; exists && image != "" {
			client.pausedMu.RLock()
			isPaused := client.paused[position]
			client.pausedMu.RUnlock()

			if !isPaused {
				msg := map[string]interface{}{
					"type":     "image",
					"position": position,
					"image":    image,
				}

				// Add filename if available
				if filename, hasFilename := a.filenames[position]; hasFilename {
					msg["filename"] = filename
				}

				client.conn.WriteJSON(msg)
			}
		}
	}
}

func (a *App) watchFolder(dir string, extensions []string) {
	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		log.Fatal("Error creating watcher:", err)
	}
	defer watcher.Close()

	err = watcher.Add(dir)
	if err != nil {
		log.Fatal("Error watching directory:", err)
	}

	for {
		select {
		case event, ok := <-watcher.Events:
			if !ok {
				return
			}
			if event.Op&fsnotify.Create == fsnotify.Create ||
				event.Op&fsnotify.Write == fsnotify.Write {
				if isMediaFile(event.Name, extensions) {
					fmt.Printf("Quickview: New media detected: %s\n", filepath.Base(event.Name))
					a.loadMedia(event.Name)
				}
			}
		case err, ok := <-watcher.Errors:
			if !ok {
				return
			}
			log.Println("Watcher error:", err)
		}
	}
}

func (a *App) loadMedia(imagePath string) {
	file, err := os.Open(imagePath)
	if err != nil {
		log.Printf("Error opening media %s: %v", imagePath, err)
		return
	}
	defer file.Close()

	data, err := io.ReadAll(file)
	if err != nil {
		log.Printf("Error reading media %s: %v", imagePath, err)
		return
	}

	// skip if no media data
	if len(data) == 0 {
		return
	}

	// skip if already processed
	_, found := a.filenameCache.Get(imagePath)
	if found {
		fmt.Printf("Quickview: Skipping - %s already processed\n", filepath.Base(imagePath))
		return
	}
	a.filenameCache.SetDefault(imagePath, true)

	encoded := base64.StdEncoding.EncodeToString(data)

	// Find next available frame across all windows
	a.clientsMu.RLock()
	defer a.clientsMu.RUnlock()

	if len(a.clients) == 0 {
		return
	}

	// Build list of all available (non-paused) frames
	framePositions := make([]struct {
		client   *Client
		position string
	}, 0)

	for _, client := range a.clients {
		positions := a.getPositionsForGrid(client.gridWidth, client.gridHeight)
		for _, pos := range positions {
			client.pausedMu.RLock()
			isPaused := client.paused[pos]
			client.pausedMu.RUnlock()

			if !isPaused {
				framePositions = append(framePositions, struct {
					client   *Client
					position string
				}{client, pos})
			}
		}
	}

	if len(framePositions) == 0 {
		log.Println("All frames are paused")
		return
	}

	// Find which frame to update (round-robin)
	a.mu.Lock()
	nextIndex := a.imageCount % len(framePositions)
	a.imageCount++
	frame := framePositions[nextIndex]

	// Store image and filename
	a.images[frame.position] = encoded
	a.filenames[frame.position] = filepath.Base(imagePath)
	a.mu.Unlock()

	// Send to the specific client
	frame.client.conn.WriteJSON(map[string]interface{}{
		"type":     "image",
		"position": frame.position,
		"image":    encoded,
		"filename": filepath.Base(imagePath),
	})
}

func (a *App) getPositionsForGrid(gridWidth, gridHeight int) []string {
	positions := make([]string, 0, gridWidth*gridHeight)
	for row := 0; row < gridHeight; row++ {
		for col := 0; col < gridWidth; col++ {
			positions = append(positions, fmt.Sprintf("r%dc%d", row, col))
		}
	}
	return positions
}

func isMediaFile(filename string, extensions []string) bool {
	ext := strings.ToLower(filepath.Ext(filename))
	for _, validExt := range extensions {
		if ext == strings.ToLower(validExt) {
			return true
		}
	}
	return false
}

func isVideoFile(filename string) bool {
	ext := strings.ToLower(filepath.Ext(filename))
	return ext == ".mp4"
}