"""
Browser Automation Routes

API endpoints for browser automation with CDP via Playwright.

Governance Integration:
- All browser actions require INTERN+ maturity level
- Full audit trail via browser_audit table
- Agent execution tracking for all browser sessions

Refactored to use standardized decorators and service factory.
"""

from datetime import datetime
from typing import Any, Dict, Optional
import uuid
from fastapi import Depends, HTTPException
from pydantic import BaseModel
from sqlalchemy.orm import Session

from core.agent_context_resolver import AgentContextResolver
from core.base_routes import BaseAPIRouter
from core.database import get_db
from core.error_handler_decorator import handle_errors
from core.error_handlers import ErrorCode
from core.feature_flags import FeatureFlags
from core.models import AgentExecution, BrowserAudit, BrowserSession, User
from core.security_dependencies import get_current_user
from core.service_factory import ServiceFactory
from core.structured_logger import get_logger
from tools.browser_tool import (
    browser_click,
    browser_close_session,
    browser_create_session,
    browser_execute_script,
    browser_extract_text,
    browser_fill_form,
    browser_get_page_info,
    browser_navigate,
    browser_screenshot,
)

logger = get_logger(__name__)

router = BaseAPIRouter(prefix="/api/browser", tags=["browser"])


# ============================================================================
# Request/Response Models
# ============================================================================

class CreateSessionRequest(BaseModel):
    headless: Optional[bool] = None
    browser_type: str = "chromium"
    agent_id: Optional[str] = None


class NavigateRequest(BaseModel):
    session_id: str
    url: str
    wait_until: str = "load"
    agent_id: Optional[str] = None


class ScreenshotRequest(BaseModel):
    session_id: str
    full_page: bool = False
    path: Optional[str] = None
    agent_id: Optional[str] = None


class FillFormRequest(BaseModel):
    session_id: str
    selectors: Dict[str, str]
    submit: bool = False
    agent_id: Optional[str] = None


class ClickRequest(BaseModel):
    session_id: str
    selector: str
    wait_for: Optional[str] = None
    agent_id: Optional[str] = None


class ExtractTextRequest(BaseModel):
    session_id: str
    selector: Optional[str] = None
    agent_id: Optional[str] = None


class ExecuteScriptRequest(BaseModel):
    session_id: str
    script: str
    agent_id: Optional[str] = None


class CloseSessionRequest(BaseModel):
    session_id: str
    agent_id: Optional[str] = None


# ============================================================================
# Helper Functions
# ============================================================================

async def _check_browser_governance(
    db: Session,
    agent_id: str,
    user_id: str,
    action_type: str
) -> tuple:
    """
    Perform governance check for browser actions.

    Returns:
        Tuple of (agent, governance_check_result)
        agent can be None if no agent_id or agent not found
        governance_check_result can be None if check skipped
    """
    agent = None
    governance_check = None

    if agent_id and FeatureFlags.should_enforce_governance('browser'):
        try:
            resolver = AgentContextResolver(db)
            governance = ServiceFactory.get_governance_service(db)

            agent, _ = await resolver.resolve_agent_for_request(
                user_id=user_id,
                requested_agent_id=agent_id,
                action_type=action_type
            )

            if agent:
                governance_check = governance.can_perform_action(
                    agent_id=agent.id,
                    action_type=action_type
                )

                if not governance_check["allowed"]:
                    logger.warning(
                        f"Governance blocked: agent={agent.id}, action={action_type}, "
                        f"reason={governance_check['reason']}"
                    )
                    raise router.governance_denied_error(
                        agent_id=agent.id,
                        action=action_type,
                        maturity_level=agent.maturity_level if hasattr(agent, 'maturity_level') else agent.status,
                        required_level="INTERN",
                        reason=governance_check['reason']
                    )

        except HTTPException:
            raise
        except Exception as e:
            logger.error(f"Governance check failed: {e}")

    return agent, governance_check

def _create_browser_audit(
    db: Session,
    user_id: str,
    session_id: str,
    action_type: str,
    action_target: Optional[str],
    action_params: Dict[str, Any],
    success: bool,
    result_summary: Optional[str] = None,
    error_message: Optional[str] = None,
    result_data: Optional[Dict[str, Any]] = None,
    duration_ms: Optional[int] = None,
    agent_id: Optional[str] = None,
    agent_execution_id: Optional[str] = None,
    governance_check_passed: Optional[bool] = None,
) -> BrowserAudit:
    """Create a browser audit entry."""
    try:
        audit = BrowserAudit(
            id=str(uuid.uuid4()),
            workspace_id="default",
            agent_id=agent_id,
            agent_execution_id=agent_execution_id,
            user_id=user_id,
            session_id=session_id,
            action_type=action_type,
            action_target=action_target,
            action_params=action_params,
            success=success,
            result_summary=result_summary,
            error_message=error_message,
            result_data=result_data or {},
            duration_ms=duration_ms,
            governance_check_passed=governance_check_passed
        )
        db.add(audit)
        db.commit()
        db.refresh(audit)
        return audit
    except Exception as e:
        logger.error(f"Failed to create browser audit: {e}")
        return None


# ============================================================================
# API Endpoints
# ============================================================================

@router.post("/session/create")
@handle_errors(error_code=ErrorCode.INTERNAL_SERVER_ERROR)
async def create_browser_session(
    request: CreateSessionRequest,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """
    Create a new browser session.

    Requires INTERN+ maturity level for agent-initiated sessions.
    """
    result = await browser_create_session(
        user_id=current_user.id,
        agent_id=request.agent_id,
        headless=request.headless,
        browser_type=request.browser_type,
        db=db
    )

    if not result.get("success"):
        error_msg = result.get("error", "Failed to create browser session")
        if "governance" in error_msg.lower() or "permission" in error_msg.lower():
            raise router.permission_denied_error("create_browser_session", "BrowserSession", details={"error": error_msg})
        raise router.error_response("SESSION_CREATE_FAILED", error_msg, status_code=400)

    # Create database session record
    try:
        db_session = BrowserSession(
            session_id=result["session_id"],
            workspace_id="default",
            agent_id=request.agent_id,
            user_id=current_user.id,
            browser_type=request.browser_type,
            headless=result.get("headless", True),
            status="active",
            metadata_json={"created_via": "api"}
        )
        db.add(db_session)
        db.commit()
        db.refresh(db_session)

        result["db_session_id"] = db_session.id
    except Exception as e:
        logger.error(
            "Failed to create browser session record",
            session_id=result.get("session_id"),
            error=str(e)
        )

    return result


@router.post("/navigate")
@handle_errors(error_code=ErrorCode.INTERNAL_SERVER_ERROR)
async def navigate(
    request: NavigateRequest,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """Navigate to a URL in an existing browser session."""
    start_time = datetime.now()
    agent = None
    governance_check = None

    # Governance check if agent_id provided
    if request.agent_id and FeatureFlags.should_enforce_governance('browser'):
        try:
            resolver = AgentContextResolver(db)
            governance = ServiceFactory.get_governance_service(db)

            agent, _ = await resolver.resolve_agent_for_request(
                user_id=current_user.id,
                requested_agent_id=request.agent_id,
                action_type="browser_navigate"
            )

            if agent:
                governance_check = governance.can_perform_action(
                    agent_id=agent.id,
                    action_type="browser_navigate"
                )

                if not governance_check["allowed"]:
                    _create_browser_audit(
                        db=db,
                        user_id=current_user.id,
                        session_id=request.session_id,
                        action_type="navigate",
                        action_target=request.url,
                        action_params={"wait_until": request.wait_until},
                        success=False,
                        error_message=f"Governance blocked: {governance_check['reason']}",
                        agent_id=agent.id,
                        governance_check_passed=False
                    )

                    raise router.governance_denied_error(
                        agent_id=agent.id,
                        action="browser_navigate",
                        maturity_level=agent.maturity_level if hasattr(agent, 'maturity_level') else agent.status,
                        required_level="INTERN",
                        reason=governance_check['reason']
                    )

                # Create execution record
                execution = AgentExecution(
                    agent_id=agent.id,
                    workspace_id="default",
                    status="running",
                    input_summary=f"Navigate to {request.url}",
                    triggered_by="browser_api"
                )
                db.add(execution)
                db.commit()
                db.refresh(execution)

        except HTTPException:
            raise
        except Exception as e:
            logger.error(f"Governance check failed: {e}")

    # Perform navigation
    result = await browser_navigate(
        session_id=request.session_id,
        url=request.url,
        wait_until=request.wait_until,
        user_id=current_user.id
    )

    duration_ms = int((datetime.now() - start_time).total_seconds() * 1000)

    # Create audit entry
    _create_browser_audit(
        db=db,
        user_id=current_user.id,
        session_id=request.session_id,
        action_type="navigate",
        action_target=request.url,
        action_params={"wait_until": request.wait_until},
        success=result.get("success", False),
        result_summary=result.get("title"),
        error_message=result.get("error"),
        result_data=result if result.get("success") else None,
        duration_ms=duration_ms,
        agent_id=agent.id if agent else None,
        governance_check_passed=governance_check["allowed"] if governance_check else None
    )

    # Update database session record
    if result.get("success"):
        try:
            db_session = db.query(BrowserSession).filter(
                BrowserSession.session_id == request.session_id
            ).first()
            if db_session:
                db_session.current_url = result.get("url")
                db_session.page_title = result.get("title")
                db.commit()
        except Exception as e:
            logger.error(f"Failed to update browser session: {e}")

    return result


@router.post("/screenshot")
async def screenshot(
    request: ScreenshotRequest,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """Take a screenshot of the current page. Requires INTERN+ maturity for agent-initiated actions."""
    start_time = datetime.now()

    # Governance check if agent_id provided
    agent = None
    governance_check = None

    if request.agent_id:
        agent, governance_check = await _check_browser_governance(
            db=db,
            agent_id=request.agent_id,
            user_id=current_user.id,
            action_type="browser_screenshot"
        )

    result = await browser_screenshot(
        session_id=request.session_id,
        full_page=request.full_page,
        path=request.path,
        user_id=current_user.id
    )

    duration_ms = int((datetime.now() - start_time).total_seconds() * 1000)

    # Create audit entry
    _create_browser_audit(
        db=db,
        user_id=current_user.id,
        session_id=request.session_id,
        action_type="screenshot",
        action_target=request.path or "base64",
        action_params={"full_page": request.full_page},
        success=result.get("success", False),
        result_summary=f"Screenshot ({result.get('size_bytes')} bytes)",
        error_message=result.get("error"),
        result_data=result if result.get("success") else None,
        duration_ms=duration_ms,
        agent_id=agent.id if agent else None,
        governance_check_passed=governance_check["allowed"] if governance_check else None
    )

    return result


@router.post("/fill-form")
async def fill_form(
    request: FillFormRequest,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """Fill form fields using CSS selectors. Requires SUPERVISED+ maturity for agent-initiated form submissions."""
    start_time = datetime.now()

    # Governance check if agent_id provided
    agent = None
    governance_check = None

    if request.agent_id:
        # Form submission requires SUPERVISED+ maturity
        if request.submit:
            agent, governance_check = await _check_browser_governance(
                db=db,
                agent_id=request.agent_id,
                user_id=current_user.id,
                action_type="browser_form_submit"
            )
        else:
            agent, governance_check = await _check_browser_governance(
                db=db,
                agent_id=request.agent_id,
                user_id=current_user.id,
                action_type="browser_fill_form"
            )

    result = await browser_fill_form(
        session_id=request.session_id,
        selectors=request.selectors,
        submit=request.submit,
        user_id=current_user.id
    )

    duration_ms = int((datetime.now() - start_time).total_seconds() * 1000)

    # Create audit entry
    _create_browser_audit(
        db=db,
        user_id=current_user.id,
        session_id=request.session_id,
        action_type="fill_form",
        action_target=f"{len(request.selectors)} fields",
        action_params={"selectors": request.selectors, "submit": request.submit},
        success=result.get("success", False),
        result_summary=f"Filled {result.get('fields_filled', 0)} fields",
        error_message=result.get("error"),
        result_data=result if result.get("success") else None,
        duration_ms=duration_ms,
        agent_id=agent.id if agent else None,
        governance_check_passed=governance_check["allowed"] if governance_check else None
    )

    return result


@router.post("/click")
async def click(
    request: ClickRequest,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """Click an element using CSS selector. Requires INTERN+ maturity for agent-initiated actions."""
    start_time = datetime.now()

    # Governance check if agent_id provided
    agent = None
    governance_check = None

    if request.agent_id:
        agent, governance_check = await _check_browser_governance(
            db=db,
            agent_id=request.agent_id,
            user_id=current_user.id,
            action_type="browser_click"
        )

    result = await browser_click(
        session_id=request.session_id,
        selector=request.selector,
        wait_for=request.wait_for,
        user_id=current_user.id
    )

    duration_ms = int((datetime.now() - start_time).total_seconds() * 1000)

    # Create audit entry
    _create_browser_audit(
        db=db,
        user_id=current_user.id,
        session_id=request.session_id,
        action_type="click",
        action_target=request.selector,
        action_params={"wait_for": request.wait_for},
        success=result.get("success", False),
        error_message=result.get("error"),
        result_data=result if result.get("success") else None,
        duration_ms=duration_ms,
        agent_id=agent.id if agent else None,
        governance_check_passed=governance_check["allowed"] if governance_check else None
    )

    return result


@router.post("/extract-text")
async def extract_text(
    request: ExtractTextRequest,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """Extract text content from the page or specific elements. Requires INTERN+ maturity for agent-initiated actions."""
    start_time = datetime.now()

    # Governance check if agent_id provided
    agent = None
    governance_check = None

    if request.agent_id:
        agent, governance_check = await _check_browser_governance(
            db=db,
            agent_id=request.agent_id,
            user_id=current_user.id,
            action_type="browser_extract_text"
        )

    result = await browser_extract_text(
        session_id=request.session_id,
        selector=request.selector,
        user_id=current_user.id
    )

    duration_ms = int((datetime.now() - start_time).total_seconds() * 1000)

    # Create audit entry
    _create_browser_audit(
        db=db,
        user_id=current_user.id,
        session_id=request.session_id,
        action_type="extract_text",
        action_target=request.selector or "full_page",
        action_params={"selector": request.selector},
        success=result.get("success", False),
        result_summary=f"Extracted {result.get('length', 0)} chars",
        error_message=result.get("error"),
        result_data={"length": result.get("length")} if result.get("success") else None,
        duration_ms=duration_ms,
        agent_id=agent.id if agent else None,
        governance_check_passed=governance_check["allowed"] if governance_check else None
    )

    return result


@router.post("/execute-script")
async def execute_script(
    request: ExecuteScriptRequest,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """Execute JavaScript in the browser context. Requires SUPERVISED+ maturity for agent-initiated script execution."""
    start_time = datetime.now()

    # Governance check if agent_id provided
    agent = None
    governance_check = None

    if request.agent_id:
        agent, governance_check = await _check_browser_governance(
            db=db,
            agent_id=request.agent_id,
            user_id=current_user.id,
            action_type="browser_execute_script"
        )

    result = await browser_execute_script(
        session_id=request.session_id,
        script=request.script,
        user_id=current_user.id
    )

    duration_ms = int((datetime.now() - start_time).total_seconds() * 1000)

    # Create audit entry (don't log full script for security)
    _create_browser_audit(
        db=db,
        user_id=current_user.id,
        session_id=request.session_id,
        action_type="execute_script",
        action_target=f"{len(request.script)} chars",
        action_params={"script_length": len(request.script)},
        success=result.get("success", False),
        result_summary="Script executed",
        error_message=result.get("error"),
        duration_ms=duration_ms,
        agent_id=agent.id if agent else None,
        governance_check_passed=governance_check["allowed"] if governance_check else None
    )

    return result


@router.post("/session/close")
async def close_session(
    request: CloseSessionRequest,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """Close a browser session. Requires INTERN+ maturity for agent-initiated session closure."""
    start_time = datetime.now()

    # Governance check if agent_id provided
    agent = None
    governance_check = None

    if request.agent_id:
        agent, governance_check = await _check_browser_governance(
            db=db,
            agent_id=request.agent_id,
            user_id=current_user.id,
            action_type="browser_close_session"
        )

    result = await browser_close_session(
        session_id=request.session_id,
        user_id=current_user.id
    )

    duration_ms = int((datetime.now() - start_time).total_seconds() * 1000)

    # Create audit entry
    _create_browser_audit(
        db=db,
        user_id=current_user.id,
        session_id=request.session_id,
        action_type="close_session",
        action_target=None,
        action_params={},
        success=result.get("success", False),
        result_summary="Session closed",
        error_message=result.get("error"),
        duration_ms=duration_ms,
        agent_id=agent.id if agent else None,
        governance_check_passed=governance_check["allowed"] if governance_check else None
    )

    # Update database session record
    if result.get("success"):
        try:
            db_session = db.query(BrowserSession).filter(
                BrowserSession.session_id == request.session_id
            ).first()
            if db_session:
                db_session.status = "closed"
                db_session.closed_at = datetime.now()
                db.commit()
        except Exception as e:
            logger.error(f"Failed to update browser session: {e}")

    return result


@router.get("/session/{session_id}/info")
async def get_session_info(
    session_id: str,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """Get information about a browser session."""
    result = await browser_get_page_info(
        session_id=session_id,
        user_id=current_user.id
    )

    # Add database info
    try:
        db_session = db.query(BrowserSession).filter(
            BrowserSession.session_id == session_id
        ).first()

        if db_session:
            result["db_session_id"] = db_session.id
            result["created_at"] = db_session.created_at.isoformat()
            result["status"] = db_session.status
            result["browser_type"] = db_session.browser_type
    except Exception as e:
        logger.error(f"Failed to fetch session info: {e}")

    return result


@router.get("/sessions")
async def list_sessions(
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """List all browser sessions for the current user."""
    try:
        sessions = db.query(BrowserSession).filter(
            BrowserSession.user_id == current_user.id
        ).order_by(BrowserSession.created_at.desc()).limit(50).all()

        return router.success_response(
            data=[
                {
                    "session_id": s.session_id,
                    "id": s.id,
                    "browser_type": s.browser_type,
                    "headless": s.headless,
                    "status": s.status,
                    "current_url": s.current_url,
                    "page_title": s.page_title,
                    "created_at": s.created_at.isoformat(),
                    "closed_at": s.closed_at.isoformat() if s.closed_at else None
                }
                for s in sessions
            ],
            message=f"Retrieved {len(sessions)} sessions"
        )
    except Exception as e:
        logger.error(f"Failed to list sessions: {e}")
        raise router.internal_error(f"Failed to list sessions: {str(e)}")


@router.get("/audit")
async def get_browser_audit(
    session_id: Optional[str] = None,
    limit: int = 100,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """Get browser audit log for the current user."""
    try:
        query = db.query(BrowserAudit).filter(
            BrowserAudit.user_id == current_user.id
        )

        if session_id:
            query = query.filter(BrowserAudit.session_id == session_id)

        audits = query.order_by(BrowserAudit.created_at.desc()).limit(limit).all()

        return router.success_response(
            data=[
                {
                    "id": a.id,
                    "session_id": a.session_id,
                    "action_type": a.action_type,
                    "action_target": a.action_target,
                    "success": a.success,
                    "result_summary": a.result_summary,
                    "error_message": a.error_message,
                    "duration_ms": a.duration_ms,
                    "created_at": a.created_at.isoformat()
                }
                for a in audits
            ],
            message=f"Retrieved {len(audits)} audit entries"
        )
    except Exception as e:
        logger.error(f"Failed to fetch audit log: {e}")
        raise router.internal_error(f"Failed to fetch audit log: {str(e)}")