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
from bs4 import BeautifulSoup, NavigableString
import urllib.parse
import os
from itertools import cycle
import uuid

# --- 1. GLOBAL RESOURCES & STATE ---
P = None
BROWSER = None
REVOLVER = None
LIVE_CONTEXTS = {}
APP_STARTED = False

SEARCH_ENGINES = {
    "DuckDuckGo": "https://duckduckgo.com/html/?q={query}",
    "Google": "https://www.google.com/search?q={query}",
    "Bing": "https://www.bing.com/search?q={query}",
    "Brave": "https://search.brave.com/search?q={query}",
    "Ecosia": "https://www.ecosia.org/search?q={query}"
}

# --- 2. PLAIN DATA STATE CLASSES ---
class TabState:
    def __init__(self, tab_id, proxy_used="Direct Connection"):
        self.id, self.url, self.title = tab_id, "about:blank", "New Tab"
        self.parsed_text, self.links, self.proxy_used = "Welcome!", [], proxy_used

class BrowserState:
    def __init__(self): self.tabs, self.active_tab_id = [], None
    def get_active_tab(self): return next((t for t in self.tabs if t.id == self.active_tab_id), None)

class CredentialRevolver:
    def __init__(self, proxy_string: str):
        self.proxies = self._parse_proxies(proxy_string)
        self.proxy_cycler = cycle(self.proxies) if self.proxies else 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) if self.proxies else 0

# --- 3. CORE ASYNC LOGIC & FORMATTING ---
def _process_element_to_markdown(element):
    if isinstance(element, NavigableString): return element.strip()
    if element.name is None: return ''
    inner_text = ''.join(_process_element_to_markdown(child) for child in element.children)
    if element.name in ['p', 'div', 'article', 'section']: return f"\n{inner_text.strip()}\n"
    if element.name == 'h1': return f"\n# {inner_text.strip()}\n"
    if element.name == 'h2': return f"\n## {inner_text.strip()}\n"
    if element.name == 'h3': return f"\n### {inner_text.strip()}\n"
    if element.name in ['h4', 'h5', 'h6']: return f"\n#### {inner_text.strip()}\n"
    if element.name == 'li': return f"* {inner_text.strip()}\n"
    if element.name in ['ul', 'ol']: return f"\n{inner_text}\n"
    if element.name in ['strong', 'b']: return f"**{inner_text.strip()}**"
    if element.name in ['em', 'i']: return f"*{inner_text.strip()}*"
    if element.name in ['pre', 'code']: return f"\n```\n{inner_text.strip()}\n```\n"
    if element.name == 'a': return f"[{inner_text.strip()}]({element.get('href', '')})"
    if element.name == 'hr': return "\n---\n"
    return inner_text

def _format_html_to_markdown(soup):
    content_node = soup.find('main') or soup.find('body')
    if not content_node: return "Could not find main body content."
    for el in content_node.select('nav, footer, header, aside, form, script, style'): el.decompose()
    return _process_element_to_markdown(content_node)

async def _fetch_and_update_tab_state(tab_state: TabState, url: str):
    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')
        tab_state.parsed_text = _format_html_to_markdown(soup)
        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 Exception as e:
        error_message = str(e).splitlines()[0]; 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, search_engine: str, action: str, value=None):
    active_tab_state = browser_state.get_active_tab()
    if action == "go" and active_tab_state and value:
        is_url = urllib.parse.urlparse(value).scheme and urllib.parse.urlparse(value).netloc
        url = value if is_url else SEARCH_ENGINES.get(search_engine, SEARCH_ENGINES["DuckDuckGo"]).format(query=urllib.parse.quote_plus(value))
        log = await _fetch_and_update_tab_state(active_tab_state, url)
    elif 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'].split('@')[-1] 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.startpage.com/")
    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."
    else: log = "No action taken."
    return browser_state, log

# ** CRITICAL BUG FIX: `NameError` is fixed by defining this function before it is called **
def update_ui_components(browser_state: BrowserState):
    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]}... ({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._")
    page_md = f"# {active_tab.title}\n**URL:** {active_tab.url}\n\n---\n\n{active_tab.parsed_text}"
    return {
        page_content: gr.Markdown(page_md),
        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 v2.1")
    with gr.Row():
        with gr.Column(scale=4):
            with gr.Row(): url_textbox = gr.Textbox(label="Enter URL or Search Query", interactive=True, scale=4); go_btn = gr.Button("Go", variant="primary", scale=1)
            with gr.Accordion("Page Content (Formatted)", open=True): page_content = gr.Markdown("Loading...")
        with gr.Column(scale=2):
            search_engine_selector = gr.Radio(list(SEARCH_ENGINES.keys()), value="DuckDuckGo", label="Search Engine")
            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)
    log_display = gr.Textbox(label="Status Log", interactive=False)
    
    all_outputs = [page_content, url_textbox, links_display, tab_selector, log_display]
    
    async def master_handler(current_state, search_engine, 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, search_engine, action, value)
        ui_updates = update_ui_components(new_state)
        
        return (new_state, ui_updates[page_content], ui_updates[url_textbox], ui_updates[links_display], ui_updates[tab_selector], log)
    
    async def on_load(state, search_engine): return await master_handler(state, search_engine, "new_tab", None)
    async def on_go_click(state, search_engine, value): return await master_handler(state, search_engine, "go", value)
    async def on_click_link(state, search_engine, value): return await master_handler(state, search_engine, "click", value)
    async def on_new_tab(state, search_engine): return await master_handler(state, search_engine, "new_tab", None)
    async def on_close_tab(state, search_engine): return await master_handler(state, search_engine, "close_tab", None)
    async def on_switch_tab(state, search_engine, value): return await master_handler(state, search_engine, "switch_tab", value)
        
    outputs = [browser_state, *all_outputs]
    demo.load(on_load, [browser_state, search_engine_selector], outputs)
    go_btn.click(on_go_click, [browser_state, search_engine_selector, url_textbox], outputs, show_progress="full")
    url_textbox.submit(on_go_click, [browser_state, search_engine_selector, url_textbox], outputs, show_progress="full")
    click_btn.click(on_click_link, [browser_state, search_engine_selector, click_num_box], outputs, show_progress="full")
    new_tab_btn.click(on_new_tab, [browser_state, search_engine_selector], outputs, show_progress="full")
    close_tab_btn.click(on_close_tab, [browser_state, search_engine_selector], outputs)
    tab_selector.input(on_switch_tab, [browser_state, search_engine_selector, tab_selector], outputs)

demo.launch()