go-service/cmd/server/web/js/camera.ts

// camera.ts
import { updateResizerVisibility } from './layout.js';

let rightPanel: HTMLElement | null = null;
let camImage: HTMLImageElement | null = null;
let crosshair: HTMLElement | null = null;
let isOpen: boolean = false;
let streamCheckInterval: number | null = null;

interface StreamResponse {
    cam: string;
    available: boolean;
    source: string;
}

export function initCamera(): void {
    rightPanel = document.getElementById("rightPanel");
    camImage = document.getElementById("camImage") as HTMLImageElement;
    crosshair = document.getElementById("crosshair");

    // Проверяем доступность потока
    checkStreamAvailability();

    const btn = document.getElementById("camToggle");

    const streamUrl = "/api/cam";

    function open(): void {
        if (isOpen) return;

        isOpen = true;

        if (rightPanel) {
            rightPanel.classList.remove("hidden");
        }

        // Показываем перекрестие
        if (crosshair) {
            crosshair.style.display = "block";
        }

        if (camImage) {
            camImage.src = streamUrl;
        }

        if (btn) {
            const textSpan = btn.querySelector('.cam-btn-text');
            if (textSpan) textSpan.textContent = 'Скрыть';
        }

        console.log("[camera] opened");

        updateResizerVisibility();

        // Запускаем мониторинг потока
        startStreamMonitoring();
    }

    function close(): void {
        if (!isOpen) return;

        isOpen = false;

        // Скрываем перекрестие
        if (crosshair) {
            crosshair.style.display = "none";
        }

        // остановка stream
        if (camImage) {
            camImage.src = "";
        }

        if (rightPanel) {
            rightPanel.classList.add("hidden");
        }

        if (btn) {
            const textSpan = btn.querySelector('.cam-btn-text');
            if (textSpan) textSpan.textContent = 'Камера';
        }

        console.log("[camera] closed");

        updateResizerVisibility();

        // Останавливаем мониторинг
        stopStreamMonitoring();
    }

    function toggle(): void {
        if (isOpen) {
            close();
        } else {
            open();
        }
    }

    if (camImage) {
        camImage.onload = () => {
            console.log("[camera] stream started");
            if (crosshair) {
                crosshair.style.opacity = '1';
            }
        };

        camImage.onerror = (e) => {
            console.error("[camera] stream error", e);
            if (crosshair) {
                crosshair.style.opacity = '0.3';
            }
        };
    }

    btn?.addEventListener("click", toggle);

    // Проверка доступности камеры
    async function checkStreamAvailability(): Promise<void> {
        try {
            const response = await fetch('/api/stream');
            const data: StreamResponse = await response.json();

            if (data.available && data.cam) {
                console.log("[camera] stream available:", data.source);
                // Автозапуск если камера доступна
                if (!isOpen) {
                    open();
                }
            } else {
                console.log("[camera] stream not available");
                if (crosshair) {
                    crosshair.style.display = 'none';
                }
            }
        } catch (error) {
            console.log("[camera] check failed:", error);
        }
    }

    // Мониторинг состояния потока
    function startStreamMonitoring(): void {
        stopStreamMonitoring();
        streamCheckInterval = window.setInterval(() => {
            if (isOpen && camImage) {
                if (!camImage.complete || camImage.naturalWidth === 0) {
                    if (crosshair) {
                        crosshair.style.opacity = '0.3';
                    }
                } else {
                    if (crosshair) {
                        crosshair.style.opacity = '1';
                    }
                }
            }
        }, 2000);
    }

    function stopStreamMonitoring(): void {
        if (streamCheckInterval) {
            clearInterval(streamCheckInterval);
            streamCheckInterval = null;
        }
    }
}

// Экспортируем для возможности ручного управления
export function showCrosshair(show: boolean = true): void {
    const crosshairElem = document.getElementById("crosshair");
    if (crosshairElem) {
        crosshairElem.style.display = show ? "block" : "none";
    }
}

export function setCrosshairOpacity(opacity: string | number): void {
    const crosshairElem = document.getElementById("crosshair");
    if (crosshairElem) {
        crosshairElem.style.opacity = String(opacity);
    }
}