/**
 * Tencent TDC.js Sandboxed Worker & Mouse Trajectory Generator
 * Runs TDC.js in an isolated mock DOM environment to generate authentic
 * encrypted telemetry (`collect`) and session encryption key (`eks`).
 */

const fs = require('fs');
const vm = require('vm');

class Element {
    constructor(tagName) {
        this.tagName = (tagName || 'div').toUpperCase();
        this.children = [];
        this.style = {};
        this.attributes = {};
    }
    appendChild(child) {
        this.children.push(child);
        return child;
    }
    removeChild(child) {
        const idx = this.children.indexOf(child);
        if (idx !== -1) this.children.splice(idx, 1);
        return child;
    }
    insertBefore(newChild, refChild) {
        const idx = this.children.indexOf(refChild);
        if (idx !== -1) this.children.splice(idx, 0, newChild);
        else this.children.push(newChild);
        return newChild;
    }
    cloneNode(deep) {
        const el = new Element(this.tagName);
        el.style = { ...this.style };
        return el;
    }
    setAttribute(k, v) { this.attributes[k] = String(v); }
    getAttribute(k) { return this.attributes[k] || null; }
    hasAttribute(k) { return k in this.attributes; }
    removeAttribute(k) { delete this.attributes[k]; }
    getBoundingClientRect() {
        return { top: 0, left: 0, width: 360, height: 360, bottom: 360, right: 360 };
    }
}

class CanvasElement extends Element {
    constructor() {
        super('CANVAS');
        this.width = 300;
        this.height = 150;
    }
    getContext(type) {
        if (type.includes('webgl')) {
            return {
                getSupportedExtensions: () => [
                    'ANGLE_instanced_arrays', 'EXT_blend_minmax', 'EXT_texture_filter_anisotropic',
                    'OES_element_index_uint', 'OES_standard_derivatives', 'OES_texture_float',
                    'OES_texture_half_float', 'OES_vertex_array_object', 'WEBGL_compressed_texture_s3tc',
                    'WEBGL_debug_renderer_info', 'WEBGL_depth_texture', 'WEBGL_lose_context'
                ],
                getExtension: (ext) => {
                    if (ext === 'WEBGL_debug_renderer_info') {
                        return { UNMASKED_VENDOR_WEBGL: 37445, UNMASKED_RENDERER_WEBGL: 37446 };
                    }
                    return null;
                },
                getParameter: (p) => {
                    if (p === 37445) return 'Apple';
                    if (p === 37446) return 'Apple M1';
                    if (p === 7936) return 'WebKit';
                    if (p === 7937) return 'WebKit WebGL';
                    return 0;
                },
                createBuffer: () => ({}),
                bindBuffer: () => {},
                bufferData: () => {},
                createProgram: () => ({}),
                createShader: () => ({}),
                shaderSource: () => {},
                compileShader: () => {},
                attachShader: () => {},
                linkProgram: () => {},
                useProgram: () => {},
                drawArrays: () => {},
                viewport: () => {},
                clearColor: () => {},
                clear: () => {}
            };
        }
        return {
            fillRect: () => {},
            fillText: () => {},
            getImageData: () => ({ data: new Uint8ClampedArray(4) }),
            measureText: (txt) => ({ width: txt.length * 10 }),
            beginPath: () => {},
            arc: () => {},
            fill: () => {},
            stroke: () => {}
        };
    }
    toDataURL() {
        return 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==';
    }
}

/**
 * Generate human-like mouse movement trajectory using cubic Bézier curves and Gaussian tremor.
 */
function generateBezierTrajectory(p0, p1, steps = 25) {
    // Control points with natural curve deviation
    const dx = p1.x - p0.x;
    const dy = p1.y - p0.y;
    const dist = Math.hypot(dx, dy);

    // Lateral deviation perpendicular to direct vector
    const perpX = -dy / (dist || 1);
    const perpY = dx / (dist || 1);
    const curvature = (Math.random() - 0.5) * Math.min(60, dist * 0.4);

    const cp1 = {
        x: p0.x + dx * 0.3 + perpX * curvature + (Math.random() - 0.5) * 10,
        y: p0.y + dy * 0.3 + perpY * curvature + (Math.random() - 0.5) * 10,
    };
    const cp2 = {
        x: p0.x + dx * 0.7 + perpX * curvature * 0.6 + (Math.random() - 0.5) * 10,
        y: p0.y + dy * 0.7 + perpY * curvature * 0.6 + (Math.random() - 0.5) * 10,
    };

    const points = [];
    for (let i = 0; i <= steps; i++) {
        const t = i / steps;
        // Ease in-out parameterization
        const easeT = t * t * (3 - 2 * t);
        const invT = 1 - easeT;

        const bx = invT * invT * invT * p0.x +
                   3 * invT * invT * easeT * cp1.x +
                   3 * invT * easeT * easeT * cp2.x +
                   easeT * easeT * easeT * p1.x;
        const by = invT * invT * invT * p0.y +
                   3 * invT * invT * easeT * cp1.y +
                   3 * invT * easeT * easeT * cp2.y +
                   easeT * easeT * easeT * p1.y;

        // Subtle tremor (except start and end)
        const tremor = (i === 0 || i === steps) ? 0 : (Math.random() - 0.5) * 1.5;
        points.push({
            x: Math.round(bx + tremor),
            y: Math.round(by + tremor)
        });
    }
    return points;
}

function runTdcCode(rawCode, clickPoints) {
    const listeners = [];
    function addL(type, fn) {
        listeners.push({ type, fn });
    }

    const docBody = new Element('BODY');
    const docElement = new Element('HTML');

    const baseWindow = {
        location: {
            href: 'https://turing.captcha.qcloud.com/cap_union_new_show?aid=2039519451',
            protocol: 'https:',
            host: 'turing.captcha.qcloud.com',
            hostname: 'turing.captcha.qcloud.com',
            pathname: '/cap_union_new_show',
            search: '?aid=2039519451',
            hash: ''
        },
        document: {
            createElement: (tag) => {
                if ((tag || '').toLowerCase() === 'canvas') return new CanvasElement();
                return new Element(tag);
            },
            addEventListener: addL,
            removeEventListener: () => {},
            body: docBody,
            documentElement: docElement,
            referrer: 'https://app.rainyun.com/',
            cookie: '',
            getElementsByTagName: (t) => [t === 'body' ? docBody : docElement],
            getElementById: () => null,
            title: '安全验证',
            head: new Element('HEAD')
        },
        navigator: {
            userAgent: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.36',
            platform: 'MacIntel',
            languages: ['zh-CN', 'zh', 'en'],
            language: 'zh-CN',
            cookieEnabled: true,
            plugins: [{ name: 'PDF Viewer' }],
            mimeTypes: []
        },
        screen: {
            width: 1920,
            height: 1080,
            availWidth: 1920,
            availHeight: 1055,
            colorDepth: 24,
            pixelDepth: 24
        },
        performance: {
            now: () => Date.now(),
            timing: {
                navigationStart: Date.now() - 2500,
                loadEventEnd: Date.now() - 800
            }
        },
        history: { length: 2 },
        indexedDB: {},
        sessionStorage: { getItem: () => null, setItem: () => {} },
        localStorage: { getItem: () => null, setItem: () => {} },
        Date: Date,
        Math: Math,
        setTimeout: setTimeout,
        clearTimeout: clearTimeout,
        setInterval: setInterval,
        clearInterval: clearInterval,
        console: { log: () => {}, error: () => {}, warn: () => {} },
        innerWidth: 360,
        innerHeight: 360,
        outerWidth: 1920,
        outerHeight: 1080,
        devicePixelRatio: 2,
        addEventListener: addL,
        removeEventListener: () => {}
    };
    baseWindow.window = baseWindow;
    baseWindow.self = baseWindow;
    baseWindow.top = baseWindow;
    baseWindow.parent = baseWindow;

    // Execute TDC.js
    vm.runInNewContext(rawCode, baseWindow);

    // Map 672x480 coordinates to 360x360 iframe display space
    const scale = 320.0 / 672.0;
    const targetPoints = clickPoints.map(p => ({
        x: Math.round(20 + p[0] * scale),
        y: Math.round(60 + p[1] * scale)
    }));

    // Generate path: entrance -> P1 -> P2 -> P3
    let currentPoint = {
        x: Math.round(150 + (Math.random() - 0.5) * 60),
        y: Math.round(320 + (Math.random() - 0.5) * 20)
    };

    const mmListener = listeners.find(l => l.type === 'mousemove');
    let currentTime = Date.now() - 1500;

    if (mmListener) {
        for (const target of targetPoints) {
            // Leg trajectory
            const steps = Math.floor(18 + Math.random() * 12);
            const leg = generateBezierTrajectory(currentPoint, target, steps);
            for (const pt of leg) {
                currentTime += Math.floor(12 + Math.random() * 16);
                mmListener.fn({
                    clientX: pt.x,
                    clientY: pt.y,
                    pageX: pt.x,
                    pageY: pt.y,
                    screenX: pt.x + 300,
                    screenY: pt.y + 200,
                    timeStamp: currentTime,
                    type: 'mousemove',
                    isTrusted: true
                });
            }
            currentPoint = target;
            // Dwell pause on icon (150ms ~ 350ms)
            const dwellSteps = Math.floor(4 + Math.random() * 5);
            for (let i = 0; i < dwellSteps; i++) {
                currentTime += Math.floor(25 + Math.random() * 30);
                mmListener.fn({
                    clientX: currentPoint.x + Math.round((Math.random() - 0.5) * 2),
                    clientY: currentPoint.y + Math.round((Math.random() - 0.5) * 2),
                    pageX: currentPoint.x,
                    pageY: currentPoint.y,
                    screenX: currentPoint.x + 300,
                    screenY: currentPoint.y + 200,
                    timeStamp: currentTime,
                    type: 'mousemove',
                    isTrusted: true
                });
            }
        }
    }

    const collect = baseWindow.TDC.getData();
    const info = baseWindow.TDC.getInfo();
    const eks = info ? info.info : '';

    return {
        collect,
        tlg: collect ? collect.length : 0,
        eks
    };
}

function runTdc(tdcFilePath, clickPoints) {
    const rawCode = fs.readFileSync(tdcFilePath, 'utf8');
    return runTdcCode(rawCode, clickPoints);
}

if (require.main === module) {
    const tdcPath = process.argv[2];
    const pointsArg = process.argv[3];
    const points = pointsArg ? JSON.parse(pointsArg) : [[626, 253], [120, 120], [438, 33]];

    if (tdcPath === '-') {
        let input = '';
        process.stdin.setEncoding('utf8');
        process.stdin.on('data', chunk => { input += chunk; });
        process.stdin.on('end', () => {
            const result = runTdcCode(input, points);
            console.log(JSON.stringify(result));
        });
    } else {
        const result = runTdc(tdcPath, points);
        console.log(JSON.stringify(result));
    }
}

module.exports = { runTdc, runTdcCode };