"""Visual browser agent - Chrome with live stream and agent memory.

Uses E2B Desktop sandbox with Chrome browser.
Time limit: 5 minutes (300 seconds)
Shows live video stream.
Includes full memory/history tracking via AgentState.
"""

import os
import shlex
import logging
import time
import json
from typing import AsyncGenerator, Optional

from app.agents.browser_dom import build_visual_dom_extract_script
from app.agents.browser_search import choose_search_url
from app.agents.browser_decision import decide_browser_action
from app.config import get_settings
from app.agents.llm_client import generate_completion
from app.agents.graph.state import AgentState
from app.agents.flaresolverr import is_cloudflare_blocked

logger = logging.getLogger(__name__)

MAX_TIME_SECONDS = 300  # 5 minutes


async def run_browser_visual_agent(
    task: str,
    url: Optional[str] = None,
) -> AsyncGenerator[dict, None]:
    """Run the visual browser agent with Chrome and live stream."""
    settings = get_settings()
    
    if not settings.e2b_api_key:
        yield {"type": "error", "message": "E2B_API_KEY not configured"}
        return
    
    # Initialize agent state with memory
    state = AgentState(
        task=task,
        url=url,
        timeout_seconds=MAX_TIME_SECONDS,
        start_time=time.time()
    )
    
    yield {"type": "status", "message": "🚀 Initializing agent..."}
    
    desktop = None
    
    try:
        from e2b_desktop import Sandbox
        
        os.environ["E2B_API_KEY"] = settings.e2b_api_key
        
        yield {"type": "status", "message": "🖥️ Creating virtual desktop..."}
        desktop = Sandbox.create(timeout=600)
        state.desktop = desktop
        
        # Start streaming
        stream_url = None
        try:
            desktop.stream.start(require_auth=True)
            auth_key = desktop.stream.get_auth_key()
            stream_url = desktop.stream.get_url(auth_key=auth_key)
            yield {"type": "stream", "url": stream_url}
            logger.info(f"Stream started: {stream_url}")
            desktop.wait(2000)
        except Exception as e:
            logger.warning(f"Could not start stream: {e}")
        
        # Launch Chrome
        yield {"type": "status", "message": "🌐 Launching browser..."}
        
        if url:
            start_url = url
        else:
            start_url = choose_search_url(task, visited_urls=state.visited_urls)
            state.add_query(task)
        
        chrome_flags = "--no-sandbox --disable-gpu --start-maximized --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --no-default-browser-check"
        desktop.commands.run(f"google-chrome {chrome_flags} {shlex.quote(start_url)} &", background=True)
        desktop.wait(3000)
        
        # Close dialogs
        desktop.press("enter")
        desktop.wait(1000)
        
        # Add to memory
        state.visited_urls.append(start_url)
        state.add_action({"type": "navigate", "url": start_url})
        
        # Main loop - time based with memory
        while state.should_continue():
            state.step_count += 1
            elapsed = int(state.get_elapsed_time())
            remaining = int(state.get_remaining_time())
            
            yield {"type": "status", "message": f"🔍 Step {state.step_count}: Analyzing... ({elapsed}s / {MAX_TIME_SECONDS}s)"}
            
            # Get page content
            current_url = state.visited_urls[-1]
            page_content = ""
            page_links: list[str] = []
            extracted_blocked = False
            
            try:
                script = build_visual_dom_extract_script(current_url)
                desktop.commands.run(f"cat > /tmp/visual_dom_extract.py << 'EOF'\n{script}\nEOF", timeout=10)
                result = desktop.commands.run("python3 /tmp/visual_dom_extract.py", timeout=45)
                output = result.stdout.strip() if hasattr(result, "stdout") else ""
                data = json.loads(output) if output else {}
                page_content = str(data.get("content", "") or "")
                page_links = [
                    link for link in (data.get("links", []) or [])
                    if isinstance(link, str) and link.startswith("http")
                ]
                extracted_blocked = bool(data.get("blocked", False))
                state.page_content = page_content
                if data.get("error"):
                    state.add_error(f"DOM extraction warning: {data['error']}")
            except Exception as e:
                logger.warning(f"DOM extraction failed: {e}")
                state.add_error(f"DOM extraction failed: {e}")

            preview_text = page_content[:2000] if page_content else "(empty page)"
            
            # Check for Cloudflare block
            is_blocked = extracted_blocked or (is_cloudflare_blocked(page_content) if page_content else False)
            
            if is_blocked:
                yield {"type": "status", "message": f"🚫 Cloudflare at {current_url[:40]}..., trying next link..."}
                state.add_error(f"Cloudflare blocked: {current_url}")
            else:
                # Add to memory
                state.extracted_data.append({
                    "url": current_url,
                    "content_length": len(page_content),
                    "links_found": len(page_links),
                    "preview": page_content[:200]
                })
            
            decision = await decide_browser_action(
                task=task,
                current_url=current_url,
                state=state,
                content_preview=preview_text,
                blocked=is_blocked,
                allow_scroll=False,
                mode_label="visual Chrome",
                step_label=f"{state.step_count}, {remaining}s remaining",
                links=page_links,
                max_tokens=600,
            )
            
            action = decision.get("action", "DONE")
            value = decision.get("value", "")
            final_answer = decision.get("answer", "")
            reason = decision.get("reason", "")
            known_facts = decision.get("known_facts", [])
            missing_points = decision.get("missing_points", [])

            if action == "SEARCH":
                state.add_query(value)

            if isinstance(known_facts, list) or isinstance(missing_points, list):
                state.update_research_progress(
                    known_facts=known_facts if isinstance(known_facts, list) else None,
                    missing_points=missing_points if isinstance(missing_points, list) else None,
                )
            
            # Record action in memory
            state.add_action({"type": action.lower(), "value": value, "reason": reason})
            
            yield {"type": "status", "message": f"🤔 Action: {action} - {reason[:50]}"}
            
            yield {
                "type": "progress",
                "known_facts": state.known_facts[-8:],
                "missing_points": state.missing_points[-8:],
                "last_queries": state.last_queries[-8:],
            }

            if action == "DONE":
                state.success = True
                
                if not final_answer:
                    # Generate from memory
                    all_content = "\n\n".join([
                        f"Source: {d['url']}\n{d.get('preview', '')}" 
                        for d in state.extracted_data[-5:]
                    ])
                    known_summary = "\n".join([f"- {f}" for f in state.known_facts[-8:]]) or "(none)"
                    missing_summary = "\n".join([f"- {m}" for m in state.missing_points[-8:]]) or "(none)"
                    final_prompt = (
                        f"Based on this content, answer: {task}\n\n"
                        f"Known facts:\n{known_summary}\n\n"
                        f"Missing points:\n{missing_summary}\n\n"
                        f"Content:\n{all_content}"
                    )
                    final_answer = await generate_completion(
                        messages=[{"role": "user", "content": final_prompt}],
                        max_tokens=1000
                    )
                
                state.final_result = final_answer
                
                yield {"type": "stream_end", "message": "Done"}
                yield {
                    "type": "result",
                    "content": final_answer,
                    "links": state.visited_urls,
                    "steps": state.step_count,
                    "success": True
                }
                
                yield {"type": "complete", "message": f"Completed in {int(state.get_elapsed_time())}s with {state.step_count} steps"}
                return
            
            elif action == "SEARCH":
                new_url = choose_search_url(
                    value,
                    visited_urls=state.visited_urls,
                    current_url=current_url,
                    blocked=is_blocked,
                )
                
                if new_url not in state.visited_urls:
                    desktop.commands.run(f"google-chrome {shlex.quote(new_url)} &", background=True)
                    desktop.wait(3000)
                    state.visited_urls.append(new_url)
            
            elif action == "NAVIGATE":
                if value and value.startswith("http"):
                    if value in state.visited_urls:
                        yield {"type": "status", "message": f"⏭️ Already visited, skipping..."}
                        state.add_error(f"Tried to revisit: {value}")
                    else:
                        desktop.commands.run(f"google-chrome {shlex.quote(value)} &", background=True)
                        desktop.wait(3000)
                        state.visited_urls.append(value)
            
            # Small delay
            desktop.wait(1000)
        
        # Timeout - generate from memory
        yield {"type": "status", "message": "⏰ Time limit reached, generating final answer from memory..."}
        
        all_content = "\n\n".join([
            f"Source: {d['url']}\n{d.get('preview', '')}" 
            for d in state.extracted_data[-5:]
        ])
        known_summary = "\n".join([f"- {f}" for f in state.known_facts[-8:]]) or "(none)"
        missing_summary = "\n".join([f"- {m}" for m in state.missing_points[-8:]]) or "(none)"
        final_prompt = (
            f"Based on this content, answer: {task}\n\n"
            f"Known facts:\n{known_summary}\n\n"
            f"Missing points:\n{missing_summary}\n\n"
            f"Content:\n{all_content}"
        )
        final_answer = await generate_completion(
            messages=[{"role": "user", "content": final_prompt}],
            max_tokens=1000
        )
        
        state.final_result = final_answer
        
        yield {"type": "stream_end", "message": "Done"}
        yield {
            "type": "result",
            "content": final_answer,
            "links": state.visited_urls,
            "steps": state.step_count,
            "success": True
        }
        yield {"type": "complete", "message": f"Completed in {MAX_TIME_SECONDS}s (timeout) with {state.step_count} steps"}
        
    except ImportError as e:
        yield {"type": "error", "message": "e2b-desktop not installed"}
    except Exception as e:
        logger.exception("Browser agent error")
        yield {"type": "error", "message": f"Error: {str(e)}"}
    finally:
        if desktop:
            try:
                desktop.stream.stop()
            except:
                pass
            try:
                desktop.kill()
            except:
                pass