"""Student API endpoint for receiving build/update requests."""
import asyncio
from datetime import datetime
from pathlib import Path

from fastapi import FastAPI, HTTPException, BackgroundTasks
from fastapi.responses import JSONResponse

from shared.config import settings
from shared.logger import setup_logger
from shared.models import RepoSubmission, TaskRequest
from student.code_generator import CodeGenerator
from student.github_manager import GitHubManager
from student.notification_client import NotificationClient

logger = setup_logger(__name__)

app = FastAPI(
    title="LLM Code Deployment - Student API",
    description="API endpoint for receiving build and update requests",
    version="1.0.0",
)

# Track ongoing tasks
active_tasks: dict[str, dict] = {}

# Lazy initialization of services
_code_generator = None
_github_manager = None
_notification_client = None


def get_code_generator():
    """Lazy initialization of code generator."""
    global _code_generator
    if _code_generator is None:
        _code_generator = CodeGenerator()
    return _code_generator


def get_github_manager():
    """Lazy initialization of GitHub manager."""
    global _github_manager
    if _github_manager is None:
        _github_manager = GitHubManager()
    return _github_manager


def get_notification_client():
    """Lazy initialization of notification client."""
    global _notification_client
    if _notification_client is None:
        _notification_client = NotificationClient()
    return _notification_client


@app.post("/api/build")
async def build_app(request: TaskRequest, background_tasks: BackgroundTasks) -> JSONResponse:
    """Receive build request and process in background.

    Args:
        request: Task request with app brief and requirements
        background_tasks: FastAPI background tasks

    Returns:
        HTTP 200 JSON response
    """
    logger.info(f"Received build request for task {request.task}, round {request.round}")

    # Verify secret
    if request.secret != settings.student_secret:
        logger.error(f"Invalid secret for task {request.task}")
        raise HTTPException(status_code=401, detail="Invalid secret")

    # Verify email
    if request.email != settings.student_email:
        logger.error(f"Email mismatch: expected {settings.student_email}, got {request.email}")
        raise HTTPException(status_code=401, detail="Email mismatch")

    # Check if task is already in progress
    task_key = f"{request.task}-{request.round}"
    if task_key in active_tasks:
        logger.warning(f"Task {task_key} already in progress")
        return JSONResponse(
            status_code=200,
            content={
                "status": "in_progress",
                "message": f"Task {task_key} is already being processed",
            },
        )

    # Mark task as active
    active_tasks[task_key] = {
        "status": "accepted",
        "started_at": datetime.utcnow().isoformat(),
    }

    # Process in background
    if request.round == 1:
        background_tasks.add_task(process_build_request, request)
    else:
        background_tasks.add_task(process_update_request, request)

    logger.info(f"Accepted task {task_key} for background processing")

    return JSONResponse(
        status_code=200,
        content={
            "status": "accepted",
            "message": f"Task {task_key} accepted for processing",
            "task": request.task,
            "round": request.round,
        },
    )


async def process_build_request(request: TaskRequest) -> None:
    """Process build request in background.

    Args:
        request: Task request
    """
    task_key = f"{request.task}-{request.round}"

    try:
        logger.info(f"Processing build request for {task_key}")

        # Create output directory
        output_dir = settings.generated_repos_dir / request.task
        output_dir.mkdir(parents=True, exist_ok=True)

        # Generate code
        logger.info(f"Generating code for {task_key}")
        active_tasks[task_key]["status"] = "generating"
        get_code_generator().generate_app(request, output_dir)

        # Create repo and deploy
        logger.info(f"Deploying to GitHub for {task_key}")
        active_tasks[task_key]["status"] = "deploying"
        repo_url, commit_sha, pages_url = get_github_manager().create_and_deploy(
            request.task, output_dir
        )

        # Prepare submission
        submission = RepoSubmission(
            email=request.email,
            task=request.task,
            round=request.round,
            nonce=request.nonce,
            repo_url=repo_url,
            commit_sha=commit_sha,
            pages_url=pages_url,
        )

        # Notify evaluation endpoint
        logger.info(f"Notifying evaluation endpoint for {task_key}")
        active_tasks[task_key]["status"] = "notifying"
        success = await get_notification_client().notify_with_timeout(
            request.evaluation_url,
            submission,
            timeout_minutes=settings.task_timeout_minutes,
        )

        if success:
            logger.info(f"Successfully completed task {task_key}")
            active_tasks[task_key]["status"] = "completed"
            active_tasks[task_key]["completed_at"] = datetime.utcnow().isoformat()
        else:
            logger.error(f"Failed to notify evaluation endpoint for {task_key}")
            active_tasks[task_key]["status"] = "notification_failed"

    except Exception as e:
        logger.error(f"Error processing build request {task_key}: {e}", exc_info=True)
        active_tasks[task_key]["status"] = "failed"
        active_tasks[task_key]["error"] = str(e)


async def process_update_request(request: TaskRequest) -> None:
    """Process update request in background.

    Args:
        request: Task request
    """
    task_key = f"{request.task}-{request.round}"

    try:
        logger.info(f"Processing update request for {task_key}")

        # Use existing output directory
        output_dir = settings.generated_repos_dir / request.task

        if not output_dir.exists():
            # If directory doesn't exist, treat as new build
            logger.warning(f"No existing code for {request.task}, creating new")
            output_dir.mkdir(parents=True, exist_ok=True)
            get_code_generator().generate_app(request, output_dir)
        else:
            # Generate updated code
            logger.info(f"Updating code for {task_key}")
            active_tasks[task_key]["status"] = "generating"
            get_code_generator().generate_app(request, output_dir)

        # Update repo and redeploy
        logger.info(f"Redeploying to GitHub for {task_key}")
        active_tasks[task_key]["status"] = "deploying"

        from shared.utils import sanitize_repo_name

        repo_name = sanitize_repo_name(request.task)

        try:
            repo_url, commit_sha = get_github_manager().update_and_redeploy(repo_name, output_dir)
            pages_url = f"https://{settings.github_username}.github.io/{repo_name}/"
        except Exception as e:
            logger.warning(f"Update failed, creating new repo: {e}")
            repo_url, commit_sha, pages_url = get_github_manager().create_and_deploy(
                request.task, output_dir
            )

        # Prepare submission
        submission = RepoSubmission(
            email=request.email,
            task=request.task,
            round=request.round,
            nonce=request.nonce,
            repo_url=repo_url,
            commit_sha=commit_sha,
            pages_url=pages_url,
        )

        # Notify evaluation endpoint
        logger.info(f"Notifying evaluation endpoint for {task_key}")
        active_tasks[task_key]["status"] = "notifying"
        success = await get_notification_client().notify_with_timeout(
            request.evaluation_url,
            submission,
            timeout_minutes=settings.task_timeout_minutes,
        )

        if success:
            logger.info(f"Successfully completed task {task_key}")
            active_tasks[task_key]["status"] = "completed"
            active_tasks[task_key]["completed_at"] = datetime.utcnow().isoformat()
        else:
            logger.error(f"Failed to notify evaluation endpoint for {task_key}")
            active_tasks[task_key]["status"] = "notification_failed"

    except Exception as e:
        logger.error(f"Error processing update request {task_key}: {e}", exc_info=True)
        active_tasks[task_key]["status"] = "failed"
        active_tasks[task_key]["error"] = str(e)


@app.get("/api/status/{task_id}")
async def get_task_status(task_id: str) -> JSONResponse:
    """Get status of a task.

    Args:
        task_id: Task identifier

    Returns:
        Task status information
    """
    matching_tasks = {k: v for k, v in active_tasks.items() if k.startswith(task_id)}

    if not matching_tasks:
        raise HTTPException(status_code=404, detail="Task not found")

    return JSONResponse(content=matching_tasks)


@app.get("/health")
async def health_check() -> JSONResponse:
    """Health check endpoint.

    Returns:
        Health status
    """
    return JSONResponse(
        content={
            "status": "healthy",
            "active_tasks": len(active_tasks),
            "timestamp": datetime.utcnow().isoformat(),
        }
    )


if __name__ == "__main__":
    import uvicorn

    # Ensure directories exist
    settings.ensure_directories()

    logger.info(f"Starting Student API on port {settings.student_api_port}")
    uvicorn.run(
        "student.api:app",
        host="0.0.0.0",
        port=settings.student_api_port,
        reload=True,
    )