app.py

import os
os.system("playwright install")
# app.py (Final, Working Async Version with All Bugs Fixed)

import gradio as gr
from playwright.async_api import async_playwright, Error as PlaywrightError
from bs4 import BeautifulSoup
import urllib.parse
import os
from itertools import cycle
import uuid

# --- 1. GLOBAL RESOURCES & STATE ---
# These are initialized on the first request to be compatible with Spaces.
P = None
BROWSER = None
REVOLVER = None
LIVE_CONTEXTS = {}  # { tab_id: { "context": PlaywrightContext, "page": PlaywrightPage } }
APP_STARTED = False

# --- 2. PLAIN DATA STATE CLASSES (Copyable) ---
class TabState:
    """A plain data class representing a tab's state. Fully copyable."""
    def __init__(self, tab_id, proxy_used="Direct Connection"):
        self.id = tab_id
        self.url = "about:blank"
        self.title = "New Tab"
        self.parsed_text = "Welcome! Navigate to a URL or search to get started."
        self.links = []
        self.proxy_used = proxy_used

class BrowserState:
    """A plain data class representing the browser's overall state."""
    def __init__(self):
        self.tabs = []
        self.active_tab_id = None
    def get_active_tab(self):
        if not self.active_tab_id: return None
        return next((t for t in self.tabs if t.id == self.active_tab_id), None)

class CredentialRevolver:
    """Manages a rotating list of proxies from an environment variable."""
    def __init__(self, proxy_string: str):
        self.proxies = self._parse_proxies(proxy_string)
        if self.proxies: self.proxy_cycler = cycle(self.proxies)
        else: self.proxy_cycler = None
    def _parse_proxies(self, proxy_string: str):
        proxies = []
        for line in proxy_string.strip().splitlines():
            try:
                parsed = urllib.parse.urlparse(f"//{line.strip()}")
                server = f"{parsed.scheme or 'http'}://{parsed.hostname}:{parsed.port}"
                proxies.append({"server": server, "username": parsed.username, "password": parsed.password})
            except: pass
        return proxies
    def get_next(self):
        return next(self.proxy_cycler) if self.proxy_cycler else None
    def count(self):
        return len(self.proxies)

# --- 3. CORE ASYNC LOGIC ---
async def _fetch_and_update_tab_state(tab_state: TabState, url: str):
    """Uses Playwright to navigate and BeautifulSoup to parse, updating the TabState object."""
    log = f"▶️ Navigating to {url}..."; live_page = LIVE_CONTEXTS[tab_state.id]["page"]
    try:
        await live_page.goto(url, wait_until='domcontentloaded', timeout=30000)
        tab_state.url = live_page.url; tab_state.title = await live_page.title() or "No Title"
        log += f"\n✅ Arrived at: {tab_state.url}"
        html_content = await live_page.content(); soup = BeautifulSoup(html_content, 'lxml')
        for script in soup(["script", "style", "nav", "footer"]): script.extract()
        tab_state.parsed_text = soup.get_text(separator='\n', strip=True)
        tab_state.links = [{'text': link.get_text(strip=True) or "[No Link Text]", 'url': urllib.parse.urljoin(tab_state.url, link['href'])} for link in soup.find_all('a', href=True) if link.get('href', '').startswith('http')]
        log += f"\n🔗 Found {len(tab_state.links)} links."
    except PlaywrightError as e:
        error_message = str(e); tab_state.title = "Error"; tab_state.url = url
        tab_state.parsed_text = f"❌ Failed to load page.\n\nError: {error_message}"
        tab_state.links = []; log += f"\n❌ {error_message}"
    return log

async def handle_action(browser_state: BrowserState, action: str, value=None):
    """Modifies the state based on user actions."""
    log = ""; active_tab_state = browser_state.get_active_tab()
    if action == "new_tab":
        tab_id, proxy_config = str(uuid.uuid4()), REVOLVER.get_next()
        context = await BROWSER.new_context(proxy=proxy_config)
        page = await context.new_page()
        LIVE_CONTEXTS[tab_id] = {"context": context, "page": page}
        new_tab = TabState(tab_id, proxy_used=proxy_config['server'] if proxy_config else "Direct")
        browser_state.tabs.append(new_tab); browser_state.active_tab_id = tab_id
        log = await _fetch_and_update_tab_state(new_tab, "https://www.whatsmyip.org/")
    elif action == "go" and active_tab_state:
        url = value if (urllib.parse.urlparse(value).scheme and urllib.parse.urlparse(value).netloc) else f"https://duckduckgo.com/html/?q={urllib.parse.quote_plus(value)}"
        log = await _fetch_and_update_tab_state(active_tab_state, url)
    elif action == "click" and active_tab_state and value is not None:
        try:
            link_index = int(value)
            if 0 <= link_index < len(active_tab_state.links): log = await _fetch_and_update_tab_state(active_tab_state, active_tab_state.links[link_index]['url'])
            else: log = "Invalid link number."
        except: log = "Please enter a valid number to click."
    elif action == "close_tab" and active_tab_state:
        if len(browser_state.tabs) > 1:
            tab_to_close_id = browser_state.active_tab_id; tab_index = browser_state.tabs.index(active_tab_state)
            browser_state.tabs.pop(tab_index); new_index = tab_index - 1 if tab_index > 0 else 0
            browser_state.active_tab_id = browser_state.tabs[new_index].id
            resources = LIVE_CONTEXTS.pop(tab_to_close_id); await resources['context'].close(); log = f"💣 Tab closed."
        else: log = "Cannot close the last tab."
    elif action == "switch_tab" and value is not None:
        browser_state.active_tab_id = value; log = f"Switched to tab."
    return browser_state, log

# **BUG FIX 1: NameError Fix**
# This function is now defined before it is called by the master_handler.
def update_ui_components(browser_state: BrowserState):
    """Generates a dictionary of UI updates from the state. Not async."""
    active_tab = browser_state.get_active_tab()
    if not active_tab: return {page_content: gr.Markdown("No active tabs."), url_textbox: "", links_display: "", tab_selector: gr.Radio(choices=[])}
    tab_choices = [(f"Tab {i}: {t.title[:25]}... (via {t.proxy_used})", t.id) for i, t in enumerate(browser_state.tabs)]
    links_md = "### 🔗 Links on Page\n" + ('\n'.join(f"{i}. [{link['text'][:80]}]({link['url']})" for i, link in enumerate(active_tab.links[:25])) if active_tab.links else "_No links found._")
    return {
        page_content: gr.Markdown(f"# {active_tab.title}\n**URL:** {active_tab.url}\n\n---\n\n{active_tab.parsed_text[:2000]}..."),
        url_textbox: gr.Textbox(value=active_tab.url), links_display: gr.Markdown(links_md),
        tab_selector: gr.Radio(choices=tab_choices, value=active_tab.id, label="Active Tabs"),
    }

# --- 4. GRADIO UI AND EVENT HANDLING ---
with gr.Blocks(theme=gr.themes.Soft(), title="Real Browser Demo") as demo:
    browser_state = gr.State(BrowserState())
    gr.Markdown("# 🛰️ Real Browser Demo (Final Working Version)")
    # UI Layout is the same...
    with gr.Row():
        with gr.Column(scale=3):
            url_textbox = gr.Textbox(label="URL or Search Term", interactive=True); go_btn = gr.Button("Go", variant="primary")
            with gr.Accordion("Page Content (Text Only)", open=True): page_content = gr.Markdown("Loading...")
            log_display = gr.Textbox(label="Status Log", interactive=False)
        with gr.Column(scale=1):
            with gr.Row(): new_tab_btn = gr.Button("➕ New Tab"); close_tab_btn = gr.Button("❌ Close Tab")
            tab_selector = gr.Radio(choices=[], label="Active Tabs", interactive=True)
            with gr.Accordion("Clickable Links", open=True):
                links_display = gr.Markdown("...");
                with gr.Row(): click_num_box = gr.Number(label="Link #", scale=1, minimum=0, step=1); click_btn = gr.Button("Click Link", scale=2)
    
    all_outputs = [page_content, url_textbox, links_display, tab_selector, log_display]
    
    async def master_handler(current_state, action, value=None):
        global APP_STARTED, P, BROWSER, REVOLVER
        if not APP_STARTED:
            print("🚀 First request received, starting up Playwright...");
            P = await async_playwright().start(); BROWSER = await P.firefox.launch(headless=True)
            proxy_list_str = os.getenv("PROXY_LIST", ""); REVOLVER = CredentialRevolver(proxy_list_str)
            print(f"✅ Playwright started. {REVOLVER.count()} proxies loaded."); APP_STARTED = True
        
        new_state, log = await handle_action(current_state, action, value)
        ui_updates = update_ui_components(new_state)
        
        # **BUG FIX 2: ValueError Fix**
        # We must return a tuple with a value for EACH output component, in the correct order.
        return (
            new_state, # 1. For the browser_state output
            ui_updates[page_content], # 2.
            ui_updates[url_textbox], # 3.
            ui_updates[links_display], # 4.
            ui_updates[tab_selector], # 5.
            log # 6. The log textbox is now updated correctly
        )
    
    # Define simple async lambdas for each event to ensure clean wiring
    on_load = lambda s: master_handler(s, "new_tab", None)
    on_go_click = lambda s, v: master_handler(s, "go", v)
    on_click_link = lambda s, v: master_handler(s, "click", v)
    on_new_tab = lambda s: master_handler(s, "new_tab", None)
    on_close_tab = lambda s: master_handler(s, "close_tab", None)
    on_switch_tab = lambda s, v: master_handler(s, "switch_tab", v)
        
    # Wire up the new, clean event handlers
    demo.load(on_load, inputs=[browser_state], outputs=[browser_state, *all_outputs])
    go_btn.click(on_go_click, [browser_state, url_textbox], [browser_state, *all_outputs], show_progress="full")
    url_textbox.submit(on_go_click, [browser_state, url_textbox], [browser_state, *all_outputs], show_progress="full")
    click_btn.click(on_click_link, [browser_state, click_num_box], [browser_state, *all_outputs], show_progress="full")
    new_tab_btn.click(on_new_tab, [browser_state], [browser_state, *all_outputs], show_progress="full")
    close_tab_btn.click(on_close_tab, [browser_state], [browser_state, *all_outputs])
    tab_selector.input(on_switch_tab, [browser_state, tab_selector], [browser_state, *all_outputs])

demo.launch()