import * as Cesium from "cesium";


Cesium.Ion.defaultAccessToken = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI3NjcxNWZiYy1mZjFiLTQzNGEtYmEwNy1hMmU0ZDg4NWI2ZGUiLCJpZCI6Mzc3NjU2LCJpYXQiOjE3NjgyMTk2NzJ9.D5DL5zrDi4yK6OPgq-ypC4hM5hfqYKODvppgakc7y3g";

const creditContainer = document.createElement('div');
creditContainer.style.display = 'none';

const viewer = new Cesium.Viewer("cesiumContainer", {
    timeline: false,
    animation: false,
    sceneModePicker: false,
    baseLayerPicker: false,
    geocoder: false,
    homeButton: false,
    navigationHelpButton: false,
    terrainProvider: await Cesium.createWorldTerrainAsync(),
    creditContainer: creditContainer,
    contextOptions: {
        webgl: {
            preserveDrawingBuffer: true
        }
    }
});

try {
    const tileset = await Cesium.Cesium3DTileset.fromIonAssetId(2275207);
    viewer.scene.primitives.add(tileset);
} catch (error) {
    console.log(error);
}

/* 
=================== Настройка отображения ===================
*/

const outputWidth = 512;
const outputHeight = 512;

viewer.scene.canvas.style.width = outputWidth + 'px';
viewer.scene.canvas.style.height = outputHeight + 'px';
viewer.container.style.width = outputWidth + 'px';
viewer.container.style.height = outputHeight + 'px';

viewer.resize(); // важно: обновляет внутренние размеры рендерера

/* 
=================== Вспомагательные функции ===================
*/

function dmsToDecimal(dms) {
    // Пример входа: "48°18'20\"N" или "16°24'41\"E"
    const regex = /(\d+)°(\d+)'(\d+)"?([NSEW])/i;
    const match = dms.match(regex);
    if (!match) {
        throw new Error("Неверный формат координат: " + dms);
    }

    const degrees = parseInt(match[1], 10);
    const minutes = parseInt(match[2], 10);
    const seconds = parseInt(match[3], 10);
    const direction = match[4].toUpperCase();

    let decimal = degrees + minutes / 60 + seconds / 3600;

    // Южная и Западная широты — отрицательные
    if (direction === "S" || direction === "W") {
        decimal = -decimal;
    }

    return decimal;
}

function metersToLat(m) {
    return m / METERS_PER_DEG_LAT;
}

function metersToLon(m, latDeg) {
    return m / (METERS_PER_DEG_LAT * Math.cos(Cesium.Math.toRadians(latDeg)));
}

function saveImage(filename) {
    const canvas = viewer.scene.canvas;
    const image = canvas.toDataURL("image/png");

    const link = document.createElement("a");
    link.href = image;
    link.download = filename;
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
}

function downloadFile(filename, content, mime = "text/plain") {
    const blob = new Blob([content], { type: mime });
    const url = URL.createObjectURL(blob);

    const a = document.createElement("a");
    a.href = url;
    a.download = filename;
    document.body.appendChild(a);
    a.click();

    document.body.removeChild(a);
    URL.revokeObjectURL(url);
}

/* 
=================== Константы и переменные ===================
*/

const METERS_PER_DEG_LAT = 111_320;

// ---- Параметры сетки ----

const GRID = 2;
const TILE_M = 50;
const CAMERA_HEIGHT = 450;

// ---- Координаты ----

const latDMS = "45°25'3\"N";
const lonDMS = "9°04'15\"E";
//45°25'35"N 9°04'15"E

const half = (GRID - 1) * TILE_M / 2;

const CENTER_LAT = dmsToDecimal(latDMS);
const CENTER_LON = dmsToDecimal(lonDMS);
const startLat = CENTER_LAT + metersToLat(half);
const startLon = CENTER_LON - metersToLon(half, CENTER_LAT);


let row = 0;
let col = 0;
let index = 0;
const offset = 0.0005;

/* 
=================== Главный цикл сбора ===================
*/

var flag = false;

function captureNextTile() {

    if (flag == false) {
        setTimeout(() => {
            flag = true;
        }, 5000)
    }

    const lat = startLat - metersToLat(row * TILE_M);
    const lon = startLon + metersToLon(col * TILE_M, lat);

    downloadFile(
        `tile_${index}_sat.json`,
        JSON.stringify({ lat: lat, lon: lon }, null, 2),
        "application/json"
    );

    // ---------- Спутник ----------
    viewer.camera.setView({
        destination: Cesium.Cartesian3.fromDegrees(lon, lat, CAMERA_HEIGHT),
        orientation: {
            heading: Cesium.Math.toRadians(0),
            pitch: Cesium.Math.toRadians(-90),
            roll: 0
        }
    });

    viewer.scene.requestRender();

    setTimeout(() => {
        saveImage(`tile_${index}_sat.png`);

        // ---------- Дрон ----------
        viewer.camera.setView({
            destination: Cesium.Cartesian3.fromDegrees(lon, lat - offset, CAMERA_HEIGHT),
            orientation: {
                heading: Cesium.Math.toRadians(0),
                pitch: Cesium.Math.toRadians(-60),
                roll: 0
            }
        });

        viewer.scene.requestRender();

        setTimeout(() => {
            saveImage(`tile_${index}_drone.png`);

            // ---- След. ячейка ----
            col++;
            if (col >= GRID) {
                col = 0;
                row++;
            }
            index++;

            captureNextTile();
        }, 2500); // Задержка дрон-рендера

    }, 2500); // Задержка спутник-рендера
}

/* 
=================== Запуск ===================
*/

viewer.scene.postRender.addEventListener(function once() {
    viewer.scene.postRender.removeEventListener(once);

    setTimeout(() => {
        captureNextTile();
    }, 9000);
});