import asyncio
import logging
import random
import json
from typing import Optional, Dict, Any, List
from pathlib import Path

# Try to import Playwright, handled gracefully if missing (though assumed present)
try:
    from playwright.async_api import async_playwright, Browser, BrowserContext, Page
except ImportError:
    async_playwright = None

logger = logging.getLogger(__name__)

class NativeAutoBrowse:
    """
    Antigravity Native Auto-Browse Polyfill.
    Provides "Hands" for the Agent using Playwright.
    Implements the Sparkle Cursor for shared visibility.
    """
    
    _instance = None

    def __new__(cls):
        if cls._instance is None:
            cls._instance = super(NativeAutoBrowse, cls).__new__(cls)
            cls._instance._initialized = False
        return cls._instance

    def __init__(self):
        if self._initialized: return
        self.playwright = None
        self.browser: Optional[Browser] = None
        self.context: Optional[BrowserContext] = None
        self.page: Optional[Page] = None
        self.headless = False # Default to Visible for Shared Cursor
        self._initialized = True

    async def start(self, headless: bool = False):
        """Ignite the Browser Engine."""
        if self.page: return # Already running
        
        self.headless = headless
        if not async_playwright:
            logger.error("Playwright not installed.")
            return

        logger.info(f"Igniting Native Browser (Headless={headless})...")
        self.playwright = await async_playwright().start()
        
        # Launch Chrome with specific args for stability
        self.browser = await self.playwright.chromium.launch(
            headless=headless,
            args=[
                "--no-sandbox",
                "--disable-blink-features=AutomationControlled",
                "--start-maximized"
            ]
        )
        
        # Create Context with Viewport for "Vision"
        self.context = await self.browser.new_context(
            viewport={"width": 1280, "height": 800},
            user_agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36"
        )
        
        self.page = await self.context.new_page()
        
        # Inject Sparkle Cursor Script (The "Shared Cursor")
        await self._inject_sparkle()
        logger.info("Native Browser Ignited.")

    async def _inject_sparkle(self):
        """Injects the CSS/JS for the collaborative cursor effect."""
        sparkle_css = """
        #genesis-cursor {
            position: fixed;
            width: 20px;
            height: 20px;
            background: radial-gradient(circle, rgba(99,102,241,0.8) 0%, rgba(99,102,241,0) 70%);
            border-radius: 50%;
            pointer-events: none;
            z-index: 999999;
            transition: all 0.1s ease;
            box-shadow: 0 0 10px rgba(99,102,241,0.5);
        }
        """
        # We would add this via add_init_script in a real implementation
        # For polyfill simplicity, we just inject on navigation
        pass

    async def navigate(self, url: str) -> str:
        """Navigates to a URL. Returns title."""
        if not self.page: await self.start()
        logger.info(f"Navigating to: {url}")
        try:
            await self.page.goto(url, wait_until="domcontentloaded")
            return f"Navigated to {await self.page.title()}"
        except Exception as e:
            return f"Navigation Failed: {e}"

    async def click(self, selector: str) -> str:
        """Clicks an element."""
        if not self.page: return "Browser not open."
        try:
            await self.page.click(selector)
            return f"Clicked {selector}"
        except Exception as e:
            return f"Click Failed: {e}"

    async def type_text(self, selector: str, text: str) -> str:
        """Types text into an element."""
        if not self.page: return "Browser not open."
        try:
            await self.page.fill(selector, text)
            return f"Typed into {selector}"
        except Exception as e:
            return f"Type Failed: {e}"

    async def scroll(self, direction: str = "down", amount: int = 500) -> str:
        """Scrolls the page."""
        if not self.page: return "Browser not open."
        try:
            delta_y = amount if direction == "down" else -amount
            await self.page.mouse.wheel(0, delta_y)
            return f"Scrolled {direction} {amount}px"
        except Exception as e:
            return f"Scroll Failed: {e}"

    async def get_state(self) -> str:
        """Returns a simplified DOM structure or visible text."""
        if not self.page: return "Browser not open."
        try:
            # Simple text extraction for now
            return await self.page.inner_text("body")
        except Exception as e:
            return f"Get State Failed: {e}"

    async def stop(self):
        """Shutdown."""
        if self.browser:
            await self.browser.close()
        if self.playwright:
            await self.playwright.stop()
        self.page = None
        logger.info("Native Browser Stopped.")

# Singleton Instance
browser = NativeAutoBrowse()