backend/app/tools/browser.py

"""Browser automation tool for web scraping."""

from typing import Any, Optional
from dataclasses import dataclass
from enum import Enum

from app.utils.logging import get_logger

logger = get_logger(__name__)


class BrowserType(Enum):
    """Supported browser types."""

    CHROMIUM = "chromium"
    FIREFOX = "firefox"
    WEBKIT = "webkit"


@dataclass
class BrowserConfig:
    """Configuration for browser instance."""

    browser_type: BrowserType = BrowserType.CHROMIUM
    headless: bool = True
    timeout: int = 30000  # milliseconds
    viewport_width: int = 1920
    viewport_height: int = 1080
    user_agent: Optional[str] = None
    proxy: Optional[str] = None


@dataclass
class NavigationResult:
    """Result of a navigation action."""

    url: str
    status: int
    title: str
    success: bool
    error: Optional[str] = None


@dataclass
class ClickResult:
    """Result of a click action."""

    selector: str
    success: bool
    error: Optional[str] = None


@dataclass
class ScreenshotResult:
    """Result of a screenshot action."""

    data: bytes
    format: str
    width: int
    height: int
    success: bool
    error: Optional[str] = None


class BrowserTool:
    """
    Browser automation tool using Playwright/Selenium.

    This is a stub implementation that defines the interface.
    Actual browser automation requires installing playwright or selenium.
    """

    def __init__(self, config: Optional[BrowserConfig] = None) -> None:
        self.config = config or BrowserConfig()
        self._browser: Any = None
        self._context: Any = None
        self._page: Any = None
        self._initialized: bool = False

    async def initialize(self) -> None:
        """
        Initialize the browser instance.

        Note: This is a stub. Real implementation requires playwright:
            pip install playwright
            playwright install
        """
        logger.info(f"Initializing browser: {self.config.browser_type.value}")
        # Stub: In real implementation, initialize playwright here
        # from playwright.async_api import async_playwright
        # self._playwright = await async_playwright().start()
        # self._browser = await self._playwright.chromium.launch(headless=self.config.headless)
        self._initialized = True
        logger.info("Browser initialized (stub mode)")

    async def shutdown(self) -> None:
        """Close the browser and cleanup resources."""
        logger.info("Shutting down browser")
        if self._page:
            # await self._page.close()
            self._page = None
        if self._context:
            # await self._context.close()
            self._context = None
        if self._browser:
            # await self._browser.close()
            self._browser = None
        self._initialized = False
        logger.info("Browser shutdown complete")

    async def navigate(
        self,
        url: str,
        wait_until: str = "domcontentloaded",
        timeout: Optional[int] = None,
    ) -> NavigationResult:
        """
        Navigate to a URL.

        Args:
            url: Target URL
            wait_until: Navigation wait condition (load, domcontentloaded, networkidle)
            timeout: Navigation timeout in milliseconds

        Returns:
            NavigationResult with status and details
        """
        logger.info(f"Navigating to: {url}")

        if not self._initialized:
            return NavigationResult(
                url=url,
                status=0,
                title="",
                success=False,
                error="Browser not initialized",
            )

        # Stub implementation
        # Real implementation:
        # response = await self._page.goto(url, wait_until=wait_until, timeout=timeout)
        # return NavigationResult(
        #     url=self._page.url,
        #     status=response.status if response else 0,
        #     title=await self._page.title(),
        #     success=True,
        # )

        return NavigationResult(
            url=url,
            status=200,
            title="Stub Page Title",
            success=True,
            error="Stub mode - no actual navigation",
        )

    async def click(
        self,
        selector: str,
        timeout: Optional[int] = None,
        force: bool = False,
    ) -> ClickResult:
        """
        Click an element on the page.

        Args:
            selector: CSS or XPath selector
            timeout: Click timeout in milliseconds
            force: Force click even if element is obscured

        Returns:
            ClickResult indicating success or failure
        """
        logger.info(f"Clicking element: {selector}")

        if not self._initialized:
            return ClickResult(
                selector=selector,
                success=False,
                error="Browser not initialized",
            )

        # Stub implementation
        # Real implementation:
        # await self._page.click(selector, timeout=timeout, force=force)

        return ClickResult(
            selector=selector,
            success=True,
            error="Stub mode - no actual click",
        )

    async def fill(
        self,
        selector: str,
        value: str,
        timeout: Optional[int] = None,
    ) -> ClickResult:
        """
        Fill a form field with text.

        Args:
            selector: CSS or XPath selector
            value: Text to enter
            timeout: Action timeout in milliseconds

        Returns:
            ClickResult indicating success or failure
        """
        logger.info(f"Filling element: {selector} with value")

        if not self._initialized:
            return ClickResult(
                selector=selector,
                success=False,
                error="Browser not initialized",
            )

        # Stub implementation
        # Real implementation:
        # await self._page.fill(selector, value, timeout=timeout)

        return ClickResult(
            selector=selector,
            success=True,
            error="Stub mode - no actual fill",
        )

    async def get_html(
        self,
        selector: Optional[str] = None,
    ) -> str:
        """
        Get HTML content of the page or a specific element.

        Args:
            selector: Optional selector to get HTML of specific element

        Returns:
            HTML content as string
        """
        logger.info(f"Getting HTML for: {selector or 'full page'}")

        if not self._initialized:
            return ""

        # Stub implementation
        # Real implementation:
        # if selector:
        #     element = await self._page.query_selector(selector)
        #     return await element.inner_html() if element else ""
        # return await self._page.content()

        return "<html><body><h1>Stub HTML Content</h1></body></html>"

    async def screenshot(
        self,
        selector: Optional[str] = None,
        full_page: bool = False,
        format: str = "png",
    ) -> ScreenshotResult:
        """
        Take a screenshot of the page or element.

        Args:
            selector: Optional selector to screenshot specific element
            full_page: Capture full scrollable page
            format: Image format (png, jpeg)

        Returns:
            ScreenshotResult with image data
        """
        logger.info(f"Taking screenshot: selector={selector}, full_page={full_page}")

        if not self._initialized:
            return ScreenshotResult(
                data=b"",
                format=format,
                width=0,
                height=0,
                success=False,
                error="Browser not initialized",
            )

        # Stub implementation
        # Real implementation:
        # if selector:
        #     element = await self._page.query_selector(selector)
        #     data = await element.screenshot(type=format) if element else b""
        # else:
        #     data = await self._page.screenshot(full_page=full_page, type=format)

        return ScreenshotResult(
            data=b"stub_screenshot_data",
            format=format,
            width=self.config.viewport_width,
            height=self.config.viewport_height,
            success=True,
            error="Stub mode - no actual screenshot",
        )

    async def evaluate(self, script: str) -> Any:
        """
        Execute JavaScript in the page context.

        Args:
            script: JavaScript code to execute

        Returns:
            Result of the script execution
        """
        logger.info(f"Evaluating script: {script[:50]}...")

        if not self._initialized:
            return None

        # Stub implementation
        # Real implementation:
        # return await self._page.evaluate(script)

        return None

    async def wait_for_selector(
        self,
        selector: str,
        timeout: Optional[int] = None,
        state: str = "visible",
    ) -> bool:
        """
        Wait for an element to appear on the page.

        Args:
            selector: CSS or XPath selector
            timeout: Wait timeout in milliseconds
            state: Element state to wait for (visible, hidden, attached, detached)

        Returns:
            True if element found, False otherwise
        """
        logger.info(f"Waiting for selector: {selector}")

        if not self._initialized:
            return False

        # Stub implementation
        # Real implementation:
        # try:
        #     await self._page.wait_for_selector(selector, timeout=timeout, state=state)
        #     return True
        # except TimeoutError:
        #     return False

        return True

    def health_check(self) -> bool:
        """Check if the browser is healthy and responsive."""
        return self._initialized

    @property
    def is_initialized(self) -> bool:
        """Check if the browser has been initialized."""
        return self._initialized