import asyncio
import re
import os
from schemas.agent import ToolOutput

BROWSER_ENABLED = os.getenv("AGENT_ENABLE_BROWSER", "false").lower() == "true"


async def browse(url: str = "", query: str = "") -> ToolOutput:
    if not BROWSER_ENABLED:
        return ToolOutput(tool_name="browser", output="Browser tool disabled (set AGENT_ENABLE_BROWSER=true)", latency_ms=0)
    target_url = url or _extract_url(query) or ""
    if not target_url:
        return ToolOutput(tool_name="browser", output="No URL provided", error="Missing URL", latency_ms=0)
    if not target_url.startswith("http"):
        target_url = "https://" + target_url
    try:
        from playwright.async_api import async_playwright
        async with async_playwright() as p:
            browser = await p.chromium.launch(headless=True, args=[
                "--no-sandbox", "--disable-setuid-sandbox",
                "--disable-dev-shm-usage", "--disable-gpu"
            ])
            context = await browser.new_context(
                user_agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
                viewport={"width": 1280, "height": 720}
            )
            page = await context.new_page()
            await page.goto(target_url, timeout=15000, wait_until="domcontentloaded")
            await page.wait_for_timeout(1000)
            title = await page.title()
            content = await page.evaluate("""
                () => {
                    const main = document.querySelector('main, article, .content, #content');
                    const text = (main || document.body).innerText;
                    return text.substring(0, 3000);
                }
            """)
            await browser.close()
        output = f"# {title}\\n\\n{content[:3000]}"
        return ToolOutput(tool_name="browser", output=output, latency_ms=0)
    except ImportError:
        return ToolOutput(tool_name="browser", output="Playwright not installed. Run: playwright install chromium", error="Playwright not available", latency_ms=0)
    except Exception as e:
        return ToolOutput(tool_name="browser", output="", error=str(e), latency_ms=0)


def _extract_url(text: str) -> str:
    urls = re.findall(r'https?://[^\\s<>\"]+|www\\.[^\\s<>\"]+', text)
    return urls[0] if urls else ""