"""Capture real Objectverse Diary UI assets for the HyperFrames demo video.

This script starts the local Gradio app with explicit mock runtimes, drives a
system Chrome instance through the Chrome DevTools Protocol, and saves
screenshots into ``video/objectverse-diary-demo/assets``.
"""

from __future__ import annotations

import argparse
import json
import os
import shutil
import signal
import socket
import subprocess
import textwrap
import time
import urllib.request
from pathlib import Path


PROJECT_ROOT = Path(__file__).resolve().parents[1]
DEFAULT_ASSET_DIR = PROJECT_ROOT / "video" / "objectverse-diary-demo" / "assets"
DEFAULT_TRACE_DIR = PROJECT_ROOT / ".tmp" / "demo-video-traces"
DEFAULT_CHROME_PATHS = [
    Path("/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"),
    Path("/Applications/Chromium.app/Contents/MacOS/Chromium"),
]


NODE_CAPTURE_SCRIPT = r"""
const fs = require("fs");
const path = require("path");
const http = require("http");
const { spawn } = require("child_process");

const options = JSON.parse(process.argv[1] || process.argv[2]);
const chromeArgs = [
  "--headless=new",
  "--disable-gpu",
  "--hide-scrollbars",
  "--mute-audio",
  "--no-first-run",
  "--no-default-browser-check",
  "--disable-background-networking",
  "--disable-sync",
  "--disable-extensions",
  "--disable-features=Translate",
  "--remote-debugging-port=0",
  `--user-data-dir=${options.profileDir}`,
  "about:blank",
];

function sleep(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

function requestJson(url) {
  return new Promise((resolve, reject) => {
    http.get(url, (res) => {
      let body = "";
      res.setEncoding("utf8");
      res.on("data", (chunk) => (body += chunk));
      res.on("end", () => {
        try {
          resolve(JSON.parse(body));
        } catch (error) {
          reject(error);
        }
      });
    }).on("error", reject);
  });
}

async function openWebSocket(url) {
  if (typeof WebSocket === "undefined") {
    throw new Error("Node WebSocket global is unavailable. Node 22+ is required.");
  }
  return new Promise((resolve, reject) => {
    const socket = new WebSocket(url);
    socket.addEventListener("open", () => resolve(socket), { once: true });
    socket.addEventListener("error", (event) => reject(event.error || new Error("WebSocket error")), { once: true });
  });
}

function makeClient(socket) {
  let id = 0;
  const pending = new Map();
  socket.addEventListener("message", (event) => {
    const message = JSON.parse(event.data);
    if (message.id && pending.has(message.id)) {
      const { resolve, reject } = pending.get(message.id);
      pending.delete(message.id);
      if (message.error) reject(new Error(`${message.error.message || "CDP error"} ${message.error.data || ""}`));
      else resolve(message.result || {});
    }
  });
  return {
    send(method, params = {}) {
      const commandId = ++id;
      socket.send(JSON.stringify({ id: commandId, method, params }));
      return new Promise((resolve, reject) => {
        pending.set(commandId, { resolve, reject });
        setTimeout(() => {
          if (pending.has(commandId)) {
            pending.delete(commandId);
            reject(new Error(`Timed out waiting for ${method}`));
          }
        }, 15000);
      });
    },
    close() {
      socket.close();
    },
  };
}

async function waitForExpression(client, expression, timeoutMs = 20000) {
  const start = Date.now();
  while (Date.now() - start < timeoutMs) {
    const result = await client.send("Runtime.evaluate", {
      expression,
      returnByValue: true,
      awaitPromise: true,
    });
    if (result.result && result.result.value) return true;
    await sleep(250);
  }
  let debugValue = {};
  try {
    const debug = await client.send("Runtime.evaluate", {
      expression: "(() => ({ href: location.href, readyState: document.readyState, text: document.body ? document.body.innerText.slice(0, 500) : '', html: document.documentElement ? document.documentElement.outerHTML.slice(0, 500) : '' }))()",
      returnByValue: true,
    });
    debugValue = debug.result ? debug.result.value : {};
  } catch (error) {
    debugValue = { debugError: String(error) };
  }
  throw new Error(`Timed out waiting for expression: ${expression}\nCurrent page: ${JSON.stringify(debugValue, null, 2)}`);
}

async function evaluate(client, expression) {
  return client.send("Runtime.evaluate", {
    expression,
    returnByValue: true,
    awaitPromise: true,
  });
}

function withGradioRoot(source) {
  return `
    (() => {
      const app = document.querySelector('gradio-app');
      const root = app && app.shadowRoot ? app.shadowRoot : document;
      const pageText = document.body ? document.body.innerText : '';
      ${source}
    })()
  `;
}

async function screenshot(client, name) {
  await sleep(650);
  const result = await client.send("Page.captureScreenshot", {
    format: "png",
    captureBeyondViewport: false,
    fromSurface: true,
  });
  const output = path.join(options.assetDir, `${name}.png`);
  fs.writeFileSync(output, Buffer.from(result.data, "base64"));
  console.log(output);
}

async function main() {
  fs.mkdirSync(options.assetDir, { recursive: true });
  fs.mkdirSync(options.profileDir, { recursive: true });
  const chrome = spawn(options.chromePath, chromeArgs, { stdio: ["ignore", "ignore", "pipe"] });
  let stderr = "";
  chrome.stderr.on("data", (chunk) => {
    stderr += chunk.toString();
  });

  let debuggerUrl = "";
  const start = Date.now();
  while (Date.now() - start < 12000) {
    const match = stderr.match(/DevTools listening on (ws:\/\/[^\s]+)/);
    if (match) {
      debuggerUrl = match[1];
      break;
    }
    await sleep(100);
  }
  if (!debuggerUrl) {
    chrome.kill("SIGTERM");
    throw new Error("Could not find Chrome DevTools WebSocket URL.");
  }

  const debugPort = new URL(debuggerUrl).port;
  const browserSocket = await openWebSocket(debuggerUrl);
  const browserClient = makeClient(browserSocket);
  const createdTarget = await browserClient.send("Target.createTarget", {
    url: options.appUrl,
  });
  browserClient.close();
  await sleep(500);

  const targets = await requestJson(`http://127.0.0.1:${debugPort}/json/list`);
  const pageTarget = targets.find((target) => target.id === createdTarget.targetId) || targets.find(
    (target) =>
      target.type === "page" &&
      target.webSocketDebuggerUrl &&
      String(target.url || "").startsWith(options.appUrl)
  );
  if (!pageTarget) {
    chrome.kill("SIGTERM");
    throw new Error("Could not find a Chrome page target.");
  }

  const socket = await openWebSocket(pageTarget.webSocketDebuggerUrl);
  const client = makeClient(socket);
  try {
    await client.send("Page.enable");
    await client.send("Runtime.enable");
    await client.send("Emulation.setDeviceMetricsOverride", {
      width: 1920,
      height: 1080,
      deviceScaleFactor: 1,
      mobile: false,
    });
    await client.send("Page.navigate", { url: options.appUrl });
    await waitForExpression(client, withGradioRoot("return Boolean(root.querySelector('#objectverse-app') || pageText.includes('Objectverse Diary'));"), 60000);
    await sleep(3000);
    await screenshot(client, "01-hero");

    await evaluate(client, withGradioRoot(`
        const button = [...root.querySelectorAll('button')].find((el) => el.textContent.includes('OVD-001'));
        if (!button) throw new Error('Coffee mug example button not found');
        button.click();
        return true;
    `));
    await waitForExpression(client, withGradioRoot("return pageText.includes('CoffeeMug worth is awake');"), 35000);
    await sleep(1300);
    await screenshot(client, "02-intake-awake");

    const captureScroll = async (name, selector, offset = -120) => {
      await evaluate(client, withGradioRoot(`
          const el = document.querySelector(${JSON.stringify(selector)});
          const shadowEl = root.querySelector(${JSON.stringify(selector)});
          const target = shadowEl || el;
          if (!target) throw new Error('Missing selector ${selector}');
          target.scrollIntoView({ block: 'start', inline: 'nearest' });
          window.scrollBy(0, ${offset});
          return true;
      `));
      await screenshot(client, name);
    };

    await captureScroll("03-object-file", "#results", -80);
    await captureScroll("04-diary", "#diary-output", -190);
    await captureScroll("05-share-card", "#share-chat", -80);

    await evaluate(client, withGradioRoot(`
        const input = root.querySelector('#chat-panel textarea');
        if (!input) throw new Error('Chat textarea not found');
        input.value = "What have you been hiding on my desk?";
        input.dispatchEvent(new Event('input', { bubbles: true }));
        const button = [...root.querySelectorAll('#chat-panel button')].find((el) => el.textContent.trim() === 'Ask');
        if (!button) throw new Error('Ask button not found');
        button.click();
        return true;
    `));
    await waitForExpression(client, withGradioRoot("return pageText.includes('unlimited office hours');"), 20000);
    await evaluate(client, withGradioRoot(`
        const input = root.querySelector('#chat-panel textarea');
        if (input) {
          input.value = "";
          input.dispatchEvent(new Event('input', { bubbles: true }));
          input.blur();
        }
        return true;
    `));
    await captureScroll("06-chat", "#chat-panel", -140);

    await evaluate(client, withGradioRoot(`
        const label = [...root.querySelectorAll('button, summary, [role="button"], .label-wrap, .accordion')].find((el) => el.textContent.includes('Developer details'));
        const trigger = label ? (label.closest('button, summary, [role="button"]') || label) : null;
        if (!trigger) throw new Error('Developer details trigger not found');
        const expanded = trigger.getAttribute('aria-expanded');
        if (expanded !== 'true') trigger.click();
        window.scrollTo({ top: document.body.scrollHeight, behavior: 'instant' });
        return true;
    `));
    await waitForExpression(client, withGradioRoot("return pageText.includes('Trace saved') || pageText.includes('sample-01');"), 10000);
    await sleep(1200);
    await screenshot(client, "07-trace");
  } finally {
    client.close();
    chrome.kill("SIGTERM");
  }
}

main().catch((error) => {
  console.error(error.stack || String(error));
  process.exit(1);
});
"""


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--asset-dir", type=Path, default=DEFAULT_ASSET_DIR)
    parser.add_argument("--trace-dir", type=Path, default=DEFAULT_TRACE_DIR)
    parser.add_argument("--port", type=int, default=7860)
    parser.add_argument("--chrome-path", type=Path, default=None)
    parser.add_argument("--python", type=Path, default=PROJECT_ROOT / ".venv" / "bin" / "python")
    parser.add_argument(
        "--use-uv",
        action="store_true",
        help="Run the app in a temporary uv environment instead of the project virtualenv.",
    )
    return parser.parse_args()


def find_free_port(preferred: int) -> int:
    for port in range(preferred, preferred + 50):
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as probe:
            probe.settimeout(0.2)
            if probe.connect_ex(("127.0.0.1", port)) != 0:
                return port
    raise RuntimeError("Could not find a free local port for Gradio.")


def wait_for_http(url: str, timeout: float = 45.0) -> None:
    deadline = time.time() + timeout
    last_error: Exception | None = None
    while time.time() < deadline:
        try:
            with urllib.request.urlopen(url, timeout=3) as response:
                if response.status < 500:
                    return
        except Exception as exc:  # noqa: BLE001 - retain last startup error for diagnostics.
            last_error = exc
        time.sleep(0.5)
    raise RuntimeError(f"Timed out waiting for {url}: {last_error}")


def chrome_path(explicit_path: Path | None) -> Path:
    candidates = [explicit_path] if explicit_path else []
    candidates.extend(DEFAULT_CHROME_PATHS)
    for candidate in candidates:
        if candidate and candidate.exists():
            return candidate
    raise RuntimeError("Could not find Chrome. Pass --chrome-path with a Chrome or Chromium executable.")


def start_gradio(
    python_path: Path,
    port: int,
    trace_dir: Path,
    *,
    use_uv: bool = False,
) -> subprocess.Popen[str]:
    env = os.environ.copy()
    env.update(
        {
            "OBJECTVERSE_VISION_BACKEND": "mock",
            "OBJECTVERSE_TEXT_BACKEND": "mock",
            "TRACE_OUTPUT_DIR": str(trace_dir),
            "GRADIO_SERVER_NAME": "127.0.0.1",
            "GRADIO_SERVER_PORT": str(port),
        }
    )
    return subprocess.Popen(
        _app_command(python_path, use_uv),
        cwd=PROJECT_ROOT,
        env=env,
        text=True,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
    )


def _app_command(python_path: Path, use_uv: bool) -> list[str]:
    if not use_uv:
        return [str(python_path), "app.py"]

    return [
        "uv",
        "run",
        "--no-project",
        "--with",
        "gradio>=4.44,<6",
        "--with",
        "pydantic>=2.7,<3",
        "--with",
        "spaces>=0.30",
        "--python",
        str(python_path),
        "python",
        "app.py",
    ]


def run_node_capture(app_url: str, asset_dir: Path, chrome: Path) -> None:
    profile_dir = PROJECT_ROOT / ".tmp" / "demo-video-chrome-profile"
    if profile_dir.exists():
        shutil.rmtree(profile_dir)
    options = {
        "appUrl": app_url,
        "assetDir": str(asset_dir),
        "profileDir": str(profile_dir),
        "chromePath": str(chrome),
    }
    node = subprocess.run(
        ["node", "-e", NODE_CAPTURE_SCRIPT, json.dumps(options)],
        cwd=PROJECT_ROOT,
        text=True,
        check=False,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
    )
    print(node.stdout, end="")
    if node.returncode != 0:
        raise RuntimeError(f"Node UI capture failed with exit code {node.returncode}.")


def main() -> int:
    args = parse_args()
    asset_dir = args.asset_dir.resolve()
    trace_dir = args.trace_dir.resolve()
    python_path = args.python.resolve()
    if not args.use_uv and not python_path.exists():
        raise RuntimeError(f"Python interpreter not found: {python_path}")
    if args.use_uv and shutil.which("uv") is None:
        raise RuntimeError("uv is required when --use-uv is set.")
    chrome = chrome_path(args.chrome_path)
    port = find_free_port(args.port)
    app_url = f"http://127.0.0.1:{port}"
    asset_dir.mkdir(parents=True, exist_ok=True)
    trace_dir.mkdir(parents=True, exist_ok=True)

    print(
        textwrap.dedent(
            f"""
            Capturing Objectverse Diary demo assets
            app: {app_url}
            assets: {asset_dir}
            traces: {trace_dir}
            chrome: {chrome}
            """
        ).strip()
    )

    server = start_gradio(python_path, port, trace_dir, use_uv=args.use_uv)
    try:
        wait_for_http(app_url)
        run_node_capture(app_url, asset_dir, chrome)
    finally:
        if server.poll() is None:
            server.send_signal(signal.SIGINT)
            try:
                server.wait(timeout=8)
            except subprocess.TimeoutExpired:
                server.terminate()
                server.wait(timeout=8)
        if server.stdout:
            output = server.stdout.read()
            if output:
                print(output)

    expected = [
        "01-hero.png",
        "02-intake-awake.png",
        "03-object-file.png",
        "04-diary.png",
        "05-share-card.png",
        "06-chat.png",
        "07-trace.png",
    ]
    missing = [name for name in expected if not (asset_dir / name).exists()]
    if missing:
        raise RuntimeError(f"Missing captured assets: {', '.join(missing)}")
    print("Captured assets:")
    for name in expected:
        print(f"- {asset_dir / name}")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())