import json
import logging
import os
import pathlib
import threading
import time
from datetime import datetime, timedelta
from urllib.parse import quote

import psutil
import requests

from backend.are import get_are_url, start_are_process_and_session_lite

from backend.cleanup import cleanup
from backend.globals import STORAGE_PATH

from backend.iframe import validate_mcp_file
from backend.session import UserSession
from flask import Flask, jsonify, request, send_from_directory

# Ensure storage directory exists
os.makedirs(STORAGE_PATH, exist_ok=True)

AUTH_SESSION_MANAGEMENT = {}
SESSION_MANAGEMENT = {}

# Serve the static frontend and expose a minimal API
app = Flask(
    __name__,
    static_folder=os.path.join(os.path.dirname(__file__), "frontend", "build"),
    static_url_path="",
)

logging.basicConfig(level=logging.INFO, format="[%(levelname)s] %(message)s")
logger = logging.getLogger(__name__)


def cleanup_old_sessions() -> None:
    """Clean up sessions that are older than 2 hours."""
    try:
        current_time = datetime.now()
        sessions_to_remove = []

        for username, session in SESSION_MANAGEMENT.items():
            try:
                # Parse the session start time
                start_time = datetime.strptime(
                    session.start_time, "%Y-%m-%d %H:%M:%S.%f"
                )
                session_age = current_time - start_time

                # Check if session is older than 2 hours
                if session_age > timedelta(hours=2):
                    logger.info(
                        f"Session {session.sid} for user {username} "
                        f"is {session_age} old, marking for cleanup"
                    )
                    sessions_to_remove.append(username)

            except (ValueError, AttributeError) as e:
                logger.warning(
                    f"Could not parse start time for session "
                    f"{session.sid} (user: {username}): {e}"
                )
                # If we can't parse the time, assume it's old and clean it up
                sessions_to_remove.append(username)

        # Clean up old sessions
        for username in sessions_to_remove:
            if username in SESSION_MANAGEMENT:
                session = SESSION_MANAGEMENT[username]
                logger.info(
                    f"Cleaning up old session {session.sid} " f"for user {username}"
                )
                try:
                    cleanup(session)
                    del SESSION_MANAGEMENT[username]
                    logger.info(
                        f"Successfully cleaned up old session "
                        f"{session.sid} for user {username}"
                    )
                except Exception as e:
                    logger.error(
                        f"Error cleaning up old session "
                        f"{session.sid} for user {username}: {e}"
                    )
                    # Remove from SESSION_MANAGEMENT even if cleanup failed
                    # to prevent accumulation of broken sessions
                    try:
                        del SESSION_MANAGEMENT[username]
                    except KeyError:
                        pass

        if sessions_to_remove:
            logger.info(f"Cleaned up {len(sessions_to_remove)} old sessions")

    except Exception as e:
        logger.error(f"Error during old session cleanup: {e}")


def cleanup_session_async(user_session: UserSession) -> None:
    """Run cleanup in the background to avoid blocking the main thread."""
    if user_session is None:
        return

    def run_cleanup():
        try:
            session_id = user_session.sid
            logger.info(f"Starting background cleanup for session {session_id}")
            cleanup(user_session)
            logger.info(f"Background cleanup completed for session {session_id}")

            # Also clean up any other old sessions while we're at it
            logger.info("Checking for old sessions to clean up...")
            cleanup_old_sessions()

        except Exception as e:
            session_id = getattr(user_session, "sid", "unknown")
            logger.error(
                f"Error during background cleanup for session " f"{session_id}: {e}"
            )

    # Start cleanup in a separate thread
    cleanup_thread = threading.Thread(target=run_cleanup, daemon=True)
    cleanup_thread.start()


def get_session_from_cookie(cookie):
    # Possible cookie session names
    for session_name in [
        "session",
        "spaces-jwt",
        "sessionid",
        "JSESSIONID",
        "connect.sid",
    ]:
        try:
            session = cookie[session_name]
            return session
        except Exception:
            continue
    return None


@app.get("/")
def index():
    """Serve the main HTML document."""
    sign_in_info = request.args.get("__sign", default=None, type=str)
    cookie_session = get_session_from_cookie(request.cookies)

    if sign_in_info is not None and cookie_session is not None:
        AUTH_SESSION_MANAGEMENT[cookie_session] = sign_in_info
        logger.info(f"Filled sign for session {cookie_session}: {sign_in_info}")
    return send_from_directory(app.static_folder, "index.html")


@app.get("/demo-mcp.json")
def demo_mcp():
    """Serve the demo MCP file."""
    # Try serving from the built frontend first (production)
    try:
        return send_from_directory(app.static_folder, "demo-mcp.json")
    except FileNotFoundError:
        # Fall back to the public directory (development)
        try:
            public_folder = os.path.join(
                os.path.dirname(__file__), "frontend", "public"
            )
            return send_from_directory(public_folder, "demo-mcp.json")
        except FileNotFoundError:
            logger.error("demo-mcp.json not found in either build or public directory")
            return jsonify({"error": "demo-mcp.json not found"}), 404


@app.get("/api/models/<provider>")
def get_models_for_provider(provider):
    """Fetch available models for a given provider from Hugging Face API."""
    if provider == "llama-api":
        # Model IDs from https://llama.developer.meta.com/docs/models/
        llama_models = [
            "Llama-4-Maverick-17B-128E-Instruct-FP8",
            "Llama-4-Scout-17B-16E-Instruct-FP8",
            "Llama-3.3-70B-Instruct",
            "Llama-3.3-8B-Instruct",
            "Cerebras-Llama-4-Maverick-17B-128E-Instruct",
            "Cerebras-Llama-4-Scout-17B-16E-Instruct",
            "Groq-Llama-4-Maverick-17B-128E-Instruct",
        ]
        return jsonify({"models": llama_models}), 200

    try:
        # Map provider to the correct API parameter with proper URL encoding
        encoded_provider = quote(provider)

        # Fetch models with image-text-to-text pipeline tag
        url_image_text = f"https://huggingface.co/api/models?pipeline_tag=image-text-to-text&inference_provider={encoded_provider}"
        response_image_text = requests.get(url_image_text, timeout=10)

        # Fetch models with text-generation pipeline tag
        url_text_gen = f"https://huggingface.co/api/models?pipeline_tag=text-generation&inference_provider={encoded_provider}"
        response_text_gen = requests.get(url_text_gen, timeout=10)

        # Check if both requests were successful
        if response_image_text.status_code != 200:
            logger.error(
                f"Failed to fetch image-text-to-text models for provider {provider}: "
                f"{response_image_text.status_code}"
            )
            return (
                jsonify(
                    {
                        "error": "Failed to fetch image-text-to-text models",
                        "status": response_image_text.status_code,
                    }
                ),
                500,
            )

        if response_text_gen.status_code != 200:
            logger.error(
                f"Failed to fetch text-generation models for provider {provider}: "
                f"{response_text_gen.status_code}"
            )
            return (
                jsonify(
                    {
                        "error": "Failed to fetch text-generation models",
                        "status": response_text_gen.status_code,
                    }
                ),
                500,
            )

        # Parse responses and merge results
        image_text_models = response_image_text.json()
        text_gen_models = response_text_gen.json()

        # Extract model IDs from both responses
        image_text_ids = [
            model.get("id") for model in image_text_models if model.get("id")
        ]
        text_gen_ids = [model.get("id") for model in text_gen_models if model.get("id")]

        # Merge and deduplicate model IDs
        model_ids = list(set(image_text_ids + text_gen_ids))
        model_ids.sort()  # Sort the models alphabetically

        logger.info(
            f"Fetched {len(image_text_ids)} image-text-to-text models and {len(text_gen_ids)} text-generation models for provider {provider} (total: {len(model_ids)} unique models)"
        )
        return jsonify({"models": model_ids}), 200

    except requests.RequestException as e:
        logger.error(f"Network error when fetching models for provider {provider}: {e}")
        return jsonify({"error": "Network error", "detail": str(e)}), 500
    except Exception as e:
        logger.error(
            f"Unexpected error when fetching models for provider " f"{provider}: {e}"
        )
        return jsonify({"error": "Internal error", "detail": str(e)}), 500


@app.get("/api/processes")
def list_python_processes():
    # Check for key query parameter
    key = request.args.get("key")
    if not key:
        return jsonify({"error": "Unauthorized access"}), 403

    # Check if key matches OWNER_SECRET environment variable
    owner_secret = os.environ.get("OWNER_SECRET")
    if not owner_secret:
        return (jsonify({"error": "Server configuration error"}), 500)

    if key != owner_secret:
        return jsonify({"error": "Unauthorized access"}), 403

    try:
        python_processes = []

        # Iterate through all running processes using psutil
        for proc in psutil.process_iter():
            try:
                # Get process info
                pinfo = proc.as_dict(
                    attrs=[
                        "pid",
                        "ppid",
                        "name",
                        "username",
                        "status",
                        "create_time",
                        "cpu_percent",
                        "memory_percent",
                        "memory_info",
                        "cmdline",
                    ]
                )

                # Check if this is a Python process
                process_name = pinfo["name"].lower()
                cmdline = " ".join(pinfo["cmdline"]) if pinfo["cmdline"] else ""

                if (
                    "python" in process_name
                    or "python" in cmdline.lower()
                    or cmdline.endswith(".py")
                ):

                    # Convert create_time to readable format
                    create_time = time.strftime(
                        "%Y-%m-%d %H:%M:%S", time.localtime(pinfo["create_time"])
                    )

                    # Format memory info
                    memory_info = pinfo.get("memory_info")
                    rss_mb = (memory_info.rss / 1024 / 1024) if memory_info else 0
                    vms_mb = (memory_info.vms / 1024 / 1024) if memory_info else 0

                    process_info = {
                        "pid": pinfo["pid"],
                        "ppid": pinfo["ppid"],
                        "name": pinfo["name"],
                        "username": pinfo.get("username", "unknown"),
                        "status": pinfo["status"],
                        "cpu_percent": round(pinfo.get("cpu_percent", 0), 2),
                        "memory_percent": round(pinfo.get("memory_percent", 0), 2),
                        "memory_rss_mb": round(rss_mb, 2),
                        "memory_vms_mb": round(vms_mb, 2),
                        "create_time": create_time,
                        "cmdline": (
                            cmdline[:200] + "..." if len(cmdline) > 200 else cmdline
                        ),
                    }
                    python_processes.append(process_info)

            except (psutil.NoSuchProcess, psutil.AccessDenied, psutil.ZombieProcess):
                # Process may have terminated or we don't have permission
                continue
            except Exception as e:
                logger.warning(f"Error processing process {proc.pid}: {e}")
                continue

        # Sort by PID for consistent ordering
        python_processes.sort(key=lambda x: x["pid"])

        return (
            jsonify({"processes": python_processes, "count": len(python_processes)}),
            200,
        )

    except Exception as e:
        logger.error(f"Unexpected error listing processes: {e}")
        return (jsonify({"error": "Internal server error"}), 500)


@app.get("/api/sessions")
def list_active_sessions():
    # Check for key query parameter
    key = request.args.get("key")
    if not key:
        return jsonify({"error": "Unauthorized access"}), 403

    # Check if key matches OWNER_SECRET environment variable
    owner_secret = os.environ.get("OWNER_SECRET")
    if not owner_secret:
        return (jsonify({"error": "Server configuration error"}), 500)

    if key != owner_secret:
        return jsonify({"error": "Unauthorized access"}), 403

    try:
        active_sessions = []
        current_time = time.time()

        for username, session in SESSION_MANAGEMENT.items():
            try:
                # Calculate session duration
                start_timestamp = time.mktime(
                    time.strptime(session.start_time, "%Y-%m-%d %H:%M:%S.%f")
                )
                duration_seconds = current_time - start_timestamp
                duration_hours = duration_seconds / 3600

                # Check if process is still running
                process_status = "unknown"
                cpu_percent = 0
                memory_percent = 0

                try:
                    proc = psutil.Process(session.pid)
                    process_status = proc.status()
                    cpu_percent = proc.cpu_percent()
                    memory_percent = proc.memory_percent()
                except (psutil.NoSuchProcess, psutil.AccessDenied):
                    process_status = "not_found"

                session_info = {
                    "username": username,
                    "session_id": session.sid,
                    "pid": session.pid,
                    "port": session.port,
                    "model": session.model,
                    "provider": session.provider,
                    "start_time": session.start_time,
                    "duration_hours": round(duration_hours, 2),
                    "log_path": session.log_path,
                    "process_status": process_status,
                    "cpu_percent": round(cpu_percent, 2),
                    "memory_percent": round(memory_percent, 2),
                }
                active_sessions.append(session_info)

            except Exception as e:
                logger.warning(f"Error processing session for user {username}: {e}")
                # Still include basic info even if we can't get process details
                session_info = {
                    "username": username,
                    "session_id": session.sid,
                    "pid": session.pid,
                    "port": session.port,
                    "model": session.model,
                    "provider": session.provider,
                    "start_time": session.start_time,
                    "duration_hours": "unknown",
                    "log_path": session.log_path,
                    "process_status": "error",
                    "cpu_percent": 0,
                    "memory_percent": 0,
                }
                active_sessions.append(session_info)

        # Sort by start time (most recent first)
        active_sessions.sort(
            key=lambda x: x["start_time"] if x["start_time"] != "unknown" else "",
            reverse=True,
        )

        return (
            jsonify({"sessions": active_sessions, "count": len(active_sessions)}),
            200,
        )

    except Exception as e:
        logger.error(f"Unexpected error listing sessions: {e}")
        return (jsonify({"error": "Internal server error"}), 500)


@app.post("/api/start")
def start_demo():
    """Receive the form payload and simulate demo startup.

    Logs both the raw payload and a safe summary, then returns a dummy iframe URL
    after a small delay to mimic startup time.
    """
    try:
        data = request.get_json(force=True, silent=False)
    except Exception as exc:
        logger.info("Invalid JSON", data, str(exc))
        logger.exception("Invalid JSON body")
        return jsonify({"ok": False, "error": "invalid_json", "detail": str(exc)}), 400
    if not isinstance(data, dict):
        logger.info("Invalid JSON", data)
        logger.exception("Invalid JSON body")
        return jsonify({"ok": False, "error": "invalid_json"}), 400

    cookie_session = get_session_from_cookie(request.cookies)
    try:
        signin_token = AUTH_SESSION_MANAGEMENT[cookie_session]
    except KeyError:  # weird edge case
        signin_token = cookie_session

    # Raw payload logging
    logger.info(
        "/api/start payload:\n%s", json.dumps(data, indent=2, ensure_ascii=False)
    )

    # Request metadata and a concise payload summary (avoid dumping large mcp bodies)
    client_ip = (
        (request.headers.get("X-Forwarded-For") or request.remote_addr or "-")
        .split(",")[0]
        .strip()
    )
    user_agent = request.headers.get("User-Agent", "-")
    referer = request.headers.get("Referer", "-")
    content_type = request.content_type
    content_length = request.content_length
    auth_header = request.headers.get("Authorization")
    user_token = None
    if auth_header and auth_header.lower().startswith("bearer "):
        user_token = auth_header.split(" ", 1)[1].strip()

    logger.info(
        {
            "user_agent": user_agent,
            "referer": referer,
            "content_type": content_type,
            "content_length": content_length,
            "auth_header": auth_header,
            "user_token": user_token,
        }
    )

    username = data.get("user")

    # MCP validation
    mcp_text = data.get("mcp") if isinstance(data, dict) else None
    mcp_json_path = None

    if isinstance(mcp_text, str):
        try:
            mcp_data = validate_mcp_file(mcp_text, user_token)

            mcp_json_path = f"{STORAGE_PATH}/{username}/mcp.json"
            os.makedirs(f"{STORAGE_PATH}/{username}", exist_ok=True)
            with open(pathlib.Path(mcp_json_path), "w") as file:
                json.dump(mcp_data, file, indent=4)

        except ValueError as e:
            logger.error(f"MCP file validation failed: {e}")
            return (
                jsonify({"ok": False, "error": "invalid_mcp_file", "detail": str(e)}),
                400,
            )
        except Exception as e:
            logger.error(f"Could not process MCP file: {e}")
            return (
                jsonify(
                    {
                        "ok": False,
                        "error": "mcp_processing_failed",
                        "detail": f"Failed to process MCP file: {str(e)}",
                    }
                ),
                500,
            )

    # Killing previous session
    logger.info(f"Current SESSION_MANAGEMENT keys: {list(SESSION_MANAGEMENT.keys())}")
    logger.info(f"Looking for username: {username}")
    user_session = SESSION_MANAGEMENT.get(username, None)
    if user_session:
        logger.info(f"Killing existing session for {username}: {user_session}")
        cleanup_session_async(SESSION_MANAGEMENT[username])
        del SESSION_MANAGEMENT[username]  # Actually remove the session
        user_session = None
        logger.info(
            f"Started background cleanup for previous session of user {username}"
        )
    else:
        logger.info(f"No previous processes to kill for {username}")

    user_session: UserSession = start_are_process_and_session_lite(
        model=data.get("model", ""),
        provider=data.get("provider", ""),
        username=username,
        bearer_token=signin_token,
        user_token=user_token,
        app_path=mcp_json_path,
    )

    SESSION_MANAGEMENT[username] = user_session
    logger.info(f"User SESSION {user_session}")

    logger.info(
        f"Started session {user_session.sid} on port {user_session.port} for user {user_session.user}"
    )
    iframe_url: str = get_are_url(session=user_session, server="are_simulation")
    health_url: str = get_are_url(session=user_session, server="health")

    summary = {
        "client": {
            "ip": client_ip,
            "user_agent": user_agent,
            "referer": referer,
            "content_type": content_type,
            "content_length": content_length,
        },
        "received_fields": {
            "model": data.get("model") if isinstance(data, dict) else None,
            "provider": data.get("provider") if isinstance(data, dict) else None,
            "user": data.get("user") if isinstance(data, dict) else None,
            # "mcp_length": mcp_len,
            # "mcp_is_json": mcp_is_json,
        },
        "auth": {
            "signin_token": signin_token,
        },
    }
    logger.info("/api/start summary: %s", json.dumps(summary, ensure_ascii=False))

    return jsonify({"ok": True, "received": True, "iframe_url": iframe_url, "health_url": health_url}), 200


def run():
    """Run the development/Space server."""
    port = int(os.environ.get("PORT", "7860"))
    app.run(host="0.0.0.0", port=port)


if __name__ == "__main__":
    run()