"""
Browser Automation Tool - Web scraping, screenshots, and form automation

Uses Playwright for headless browser control.
"""

import base64
import logging
from dataclasses import dataclass
from typing import Any, Dict, List, Optional

logger = logging.getLogger(__name__)

# Try to import playwright, but don't fail if not installed
try:
    from playwright.async_api import async_playwright, Page, Browser
    PLAYWRIGHT_AVAILABLE = True
except ImportError:
    PLAYWRIGHT_AVAILABLE = False
    logger.warning("Playwright not installed. Browser automation will be unavailable.")


@dataclass
class BrowserResult:
    """Result of browser automation"""
    url: str
    success: bool
    screenshot: Optional[bytes] = None
    html: Optional[str] = None
    extracted_data: Optional[Dict] = None
    error: Optional[str] = None
    final_url: Optional[str] = None


class BrowserAutomation:
    """
    Headless browser automation for:
    - Web scraping
    - Form filling and submission
    - Screenshot capture
    - PDF generation
    - Testing web applications
    """
    
    def __init__(self):
        self.playwright = None
        self.browser = None
        self._initialized = False
    
    async def _ensure_initialized(self):
        """Ensure playwright is initialized"""
        if not PLAYWRIGHT_AVAILABLE:
            raise RuntimeError("Playwright is not installed. Install with: pip install playwright")
        
        if not self._initialized:
            self.playwright = await async_playwright().start()
            self.browser = await self.playwright.chromium.launch(headless=True)
            self._initialized = True
    
    async def close(self):
        """Close browser and cleanup"""
        if self.browser:
            await self.browser.close()
        if self.playwright:
            await self.playwright.stop()
        self._initialized = False
    
    async def navigate_and_screenshot(
        self,
        url: str,
        wait_for: Optional[str] = None,
        viewport: Optional[Dict[str, int]] = None,
        full_page: bool = False
    ) -> BrowserResult:
        """Navigate to URL and take screenshot."""
        
        try:
            await self._ensure_initialized()
            
            page = await self.browser.new_page(
                viewport=viewport or {"width": 1280, "height": 720}
            )
            
            try:
                # Navigate to URL
                response = await page.goto(url, wait_until="networkidle")
                
                if wait_for:
                    await page.wait_for_selector(wait_for, timeout=10000)
                
                # Take screenshot
                screenshot = await page.screenshot(
                    type="png",
                    full_page=full_page
                )
                
                # Get page content
                html_content = await page.content()
                
                return BrowserResult(
                    url=url,
                    success=response.status < 400 if response else True,
                    screenshot=screenshot,
                    html=html_content,
                    final_url=page.url
                )
            
            finally:
                await page.close()
        
        except Exception as e:
            logger.error(f"Browser screenshot error: {e}")
            return BrowserResult(
                url=url,
                success=False,
                error=str(e)
            )
    
    async def fill_and_submit_form(
        self,
        url: str,
        form_data: Dict[str, str],
        submit_button: Optional[str] = None,
        wait_for_navigation: bool = True
    ) -> BrowserResult:
        """Fill form and submit it."""
        
        try:
            await self._ensure_initialized()
            
            page = await self.browser.new_page()
            
            try:
                # Navigate to URL
                await page.goto(url, wait_until="networkidle")
                
                # Fill form fields
                for field_name, value in form_data.items():
                    # Try different selectors
                    selectors = [
                        f'input[name="{field_name}"]',
                        f'textarea[name="{field_name}"]',
                        f'#{field_name}',
                        f'[data-testid="{field_name}"]',
                    ]
                    
                    filled = False
                    for selector in selectors:
                        try:
                            await page.fill(selector, value, timeout=2000)
                            filled = True
                            break
                        except:
                            continue
                    
                    if not filled:
                        logger.warning(f"Could not find field: {field_name}")
                
                # Submit form
                if submit_button:
                    await page.click(submit_button)
                else:
                    # Try to find submit button
                    submit_selectors = [
                        'button[type="submit"]',
                        'input[type="submit"]',
                        'button:has-text("Submit")',
                        'button:has-text("Send")',
                    ]
                    
                    for selector in submit_selectors:
                        try:
                            await page.click(selector, timeout=2000)
                            break
                        except:
                            continue
                
                if wait_for_navigation:
                    await page.wait_for_load_state("networkidle")
                
                # Capture result
                screenshot = await page.screenshot(type="png")
                final_url = page.url
                html_content = await page.content()
                
                return BrowserResult(
                    url=url,
                    success=True,
                    screenshot=screenshot,
                    html=html_content,
                    final_url=final_url
                )
            
            finally:
                await page.close()
        
        except Exception as e:
            logger.error(f"Form submission error: {e}")
            return BrowserResult(
                url=url,
                success=False,
                error=str(e)
            )
    
    async def scrape_data(
        self,
        url: str,
        extract_script: str,
        wait_for: Optional[str] = None
    ) -> BrowserResult:
        """Execute custom JavaScript to extract data."""
        
        try:
            await self._ensure_initialized()
            
            page = await self.browser.new_page()
            
            try:
                # Navigate to URL
                await page.goto(url, wait_until="networkidle")
                
                if wait_for:
                    await page.wait_for_selector(wait_for, timeout=10000)
                
                # Execute extraction script
                data = await page.evaluate(extract_script)
                
                return BrowserResult(
                    url=url,
                    success=True,
                    extracted_data=data
                )
            
            finally:
                await page.close()
        
        except Exception as e:
            logger.error(f"Data scraping error: {e}")
            return BrowserResult(
                url=url,
                success=False,
                error=str(e)
            )
    
    async def generate_pdf(
        self,
        url: str,
        output_path: Optional[str] = None
    ) -> BrowserResult:
        """Generate PDF from webpage."""
        
        try:
            await self._ensure_initialized()
            
            page = await self.browser.new_page()
            
            try:
                # Navigate to URL
                await page.goto(url, wait_until="networkidle")
                
                # Generate PDF
                pdf_bytes = await page.pdf(
                    format="A4",
                    print_background=True
                )
                
                return BrowserResult(
                    url=url,
                    success=True,
                    screenshot=pdf_bytes  # Reuse field for PDF
                )
            
            finally:
                await page.close()
        
        except Exception as e:
            logger.error(f"PDF generation error: {e}")
            return BrowserResult(
                url=url,
                success=False,
                error=str(e)
            )


# Tool specs for LLM
BROWSER_SCREENSHOT_TOOL_SPEC = {
    "name": "browser_screenshot",
    "description": (
        "Take a screenshot of a webpage. "
        "Use this to: capture visual state of websites, debug UI issues, "
        "create documentation screenshots, verify page rendering."
    ),
    "parameters": {
        "type": "object",
        "properties": {
            "url": {
                "type": "string",
                "description": "URL of the webpage to screenshot",
            },
            "wait_for": {
                "type": "string",
                "description": "CSS selector to wait for before taking screenshot (optional)",
            },
            "viewport_width": {
                "type": "number",
                "description": "Viewport width in pixels (default: 1280)",
            },
            "viewport_height": {
                "type": "number",
                "description": "Viewport height in pixels (default: 720)",
            },
            "full_page": {
                "type": "boolean",
                "description": "Capture full page or just viewport (default: false)",
            },
        },
        "required": ["url"],
    },
}

BROWSER_SCRAPE_TOOL_SPEC = {
    "name": "browser_scrape",
    "description": (
        "Extract data from a webpage using JavaScript. "
        "Use this to: scrape structured data, extract text content, "
        "get prices, collect article titles, extract table data."
    ),
    "parameters": {
        "type": "object",
        "properties": {
            "url": {
                "type": "string",
                "description": "URL of the webpage to scrape",
            },
            "extract_script": {
                "type": "string",
                "description": "JavaScript code to extract data (e.g., 'return document.title')",
            },
            "wait_for": {
                "type": "string",
                "description": "CSS selector to wait for before scraping (optional)",
            },
        },
        "required": ["url", "extract_script"],
    },
}

BROWSER_FORM_TOOL_SPEC = {
    "name": "browser_fill_form",
    "description": (
        "Fill and submit a form on a webpage. "
        "Use this to: test contact forms, submit search queries, "
        "automate login (with caution), test form validation."
    ),
    "parameters": {
        "type": "object",
        "properties": {
            "url": {
                "type": "string",
                "description": "URL of the page containing the form",
            },
            "form_data": {
                "type": "object",
                "description": "Form field names and values to fill",
            },
            "submit_button": {
                "type": "string",
                "description": "CSS selector for submit button (optional, auto-detected if not provided)",
            },
        },
        "required": ["url", "form_data"],
    },
}


# Tool handlers
async def browser_screenshot_handler(arguments: Dict[str, Any]) -> tuple[str, bool]:
    """Handler for browser screenshot."""
    try:
        if not PLAYWRIGHT_AVAILABLE:
            return "❌ Playwright is not installed. Install with: pip install playwright", False
        
        url = arguments.get("url", "").strip()
        wait_for = arguments.get("wait_for")
        viewport_width = arguments.get("viewport_width", 1280)
        viewport_height = arguments.get("viewport_height", 720)
        full_page = arguments.get("full_page", False)
        
        if not url:
            return "Error: URL is required", False
        
        logger.info(f"Taking screenshot of: {url}")
        
        browser = BrowserAutomation()
        
        try:
            result = await browser.navigate_and_screenshot(
                url=url,
                wait_for=wait_for,
                viewport={"width": viewport_width, "height": viewport_height},
                full_page=full_page
            )
            
            if not result.success:
                return f"❌ Screenshot failed: {result.error}", False
            
            # Encode screenshot as base64
            screenshot_b64 = base64.b64encode(result.screenshot).decode() if result.screenshot else None
            
            output_lines = [
                f"✅ Screenshot captured successfully",
                f"🌐 URL: {result.url}",
            ]
            
            if result.final_url and result.final_url != result.url:
                output_lines.append(f"🔄 Final URL: {result.final_url}")
            
            if screenshot_b64:
                output_lines.append(f"📸 Screenshot: data:image/png;base64,{screenshot_b64[:100]}...")
                output_lines.append(f"📊 Size: {len(result.screenshot)} bytes")
            
            return "\n".join(output_lines), True, {
                "id": f"screenshot_{hash(url) % 10000}",
                "name": "screenshot.png",
                "type": "image",
                "content": screenshot_b64,
                "size": len(result.screenshot) if result.screenshot else 0,
            }
        
        finally:
            await browser.close()
        
    except Exception as e:
        logger.error(f"Browser screenshot error: {e}")
        return f"❌ Error taking screenshot: {str(e)}", False


async def browser_scrape_handler(arguments: Dict[str, Any]) -> tuple[str, bool]:
    """Handler for browser scraping."""
    try:
        if not PLAYWRIGHT_AVAILABLE:
            return "❌ Playwright is not installed. Install with: pip install playwright", False
        
        url = arguments.get("url", "").strip()
        extract_script = arguments.get("extract_script", "").strip()
        wait_for = arguments.get("wait_for")
        
        if not url:
            return "Error: URL is required", False
        
        if not extract_script:
            return "Error: Extract script is required", False
        
        logger.info(f"Scraping data from: {url}")
        
        browser = BrowserAutomation()
        
        try:
            result = await browser.scrape_data(
                url=url,
                extract_script=extract_script,
                wait_for=wait_for
            )
            
            if not result.success:
                return f"❌ Scraping failed: {result.error}", False
            
            # Format extracted data
            data_str = str(result.extracted_data)
            if len(data_str) > 2000:
                data_str = data_str[:2000] + "... [truncated]"
            
            output_lines = [
                f"✅ Data scraped successfully",
                f"🌐 URL: {result.url}",
                f"",
                f"📊 Extracted Data:",
                data_str,
            ]
            
            return "\n".join(output_lines), True
        
        finally:
            await browser.close()
        
    except Exception as e:
        logger.error(f"Browser scraping error: {e}")
        return f"❌ Error scraping data: {str(e)}", False


async def browser_form_handler(arguments: Dict[str, Any]) -> tuple[str, bool]:
    """Handler for form filling."""
    try:
        if not PLAYWRIGHT_AVAILABLE:
            return "❌ Playwright is not installed. Install with: pip install playwright", False
        
        url = arguments.get("url", "").strip()
        form_data = arguments.get("form_data", {})
        submit_button = arguments.get("submit_button")
        
        if not url:
            return "Error: URL is required", False
        
        if not form_data:
            return "Error: Form data is required", False
        
        logger.info(f"Filling form on: {url}")
        
        browser = BrowserAutomation()
        
        try:
            result = await browser.fill_and_submit_form(
                url=url,
                form_data=form_data,
                submit_button=submit_button
            )
            
            if not result.success:
                return f"❌ Form submission failed: {result.error}", False
            
            # Encode screenshot as base64
            screenshot_b64 = base64.b64encode(result.screenshot).decode() if result.screenshot else None
            
            output_lines = [
                f"✅ Form submitted successfully",
                f"🌐 Original URL: {result.url}",
                f"🔄 Final URL: {result.final_url}",
            ]
            
            if screenshot_b64:
                output_lines.append(f"📸 Result screenshot captured")
            
            return "\n".join(output_lines), True, {
                "id": f"form_result_{hash(url) % 10000}",
                "name": "form_result.png",
                "type": "image",
                "content": screenshot_b64,
                "size": len(result.screenshot) if result.screenshot else 0,
            }
        
        finally:
            await browser.close()
        
    except Exception as e:
        logger.error(f"Form submission error: {e}")
        return f"❌ Error submitting form: {str(e)}", False