import os
import sys
import uuid
import docker
import hashlib
import pathlib
import concurrent.futures
from typing import Dict, List, Optional, Tuple
from docker.errors import DockerException, ImageNotFound

from .models import Session, SessionStatus
from .config import ConfigManager
from .session import SessionManager


class ContainerManager:
    def __init__(
        self,
        config_manager: Optional[ConfigManager] = None,
        session_manager: Optional[SessionManager] = None,
    ):
        self.config_manager = config_manager or ConfigManager()
        self.session_manager = session_manager or SessionManager()
        try:
            self.client = docker.from_env()
            # Test connection
            self.client.ping()
        except DockerException as e:
            print(f"Error connecting to Docker: {e}")
            sys.exit(1)

    def _ensure_network(self) -> None:
        """Ensure the MC network exists"""
        network_name = self.config_manager.config.docker.get("network", "mc-network")
        networks = self.client.networks.list(names=[network_name])
        if not networks:
            self.client.networks.create(network_name, driver="bridge")

    def _generate_session_id(self) -> str:
        """Generate a unique session ID"""
        return str(uuid.uuid4())[:8]

    def _get_project_config_path(self, project: Optional[str] = None) -> pathlib.Path:
        """Get the path to the project configuration directory

        Args:
            project: Optional project repository URL. If None, uses current directory.

        Returns:
            Path to the project configuration directory
        """
        # Get home directory for the MC config
        mc_home = pathlib.Path.home() / ".mc"

        # If no project URL is provided, use the current directory path
        if not project:
            # Use current working directory as project identifier
            project_id = os.getcwd()
        else:
            # Use project URL as identifier
            project_id = project

        # Create a hash of the project ID to use as directory name
        project_hash = hashlib.md5(project_id.encode()).hexdigest()

        # Create the project config directory path
        config_path = mc_home / "projects" / project_hash / "config"

        # Create the directory if it doesn't exist
        config_path.parent.mkdir(parents=True, exist_ok=True)
        config_path.mkdir(exist_ok=True)

        return config_path

    def list_sessions(self) -> List[Session]:
        """List all active MC sessions"""
        sessions = []
        try:
            containers = self.client.containers.list(
                all=True, filters={"label": "mc.session"}
            )

            for container in containers:
                container_id = container.id
                labels = container.labels

                session_id = labels.get("mc.session.id")
                if not session_id:
                    continue

                status = SessionStatus.RUNNING
                if container.status == "exited":
                    status = SessionStatus.STOPPED
                elif container.status == "created":
                    status = SessionStatus.CREATING

                session = Session(
                    id=session_id,
                    name=labels.get("mc.session.name", f"mc-{session_id}"),
                    driver=labels.get("mc.driver", "unknown"),
                    status=status,
                    container_id=container_id,
                    created_at=container.attrs["Created"],
                    project=labels.get("mc.project"),
                )

                # Get port mappings
                if container.attrs.get("NetworkSettings", {}).get("Ports"):
                    ports = {}
                    for container_port, host_ports in container.attrs[
                        "NetworkSettings"
                    ]["Ports"].items():
                        if host_ports:
                            # Strip /tcp or /udp suffix and convert to int
                            container_port_num = int(container_port.split("/")[0])
                            host_port = int(host_ports[0]["HostPort"])
                            ports[container_port_num] = host_port
                    session.ports = ports

                sessions.append(session)

        except DockerException as e:
            print(f"Error listing sessions: {e}")

        return sessions

    def create_session(
        self,
        driver_name: str,
        project: Optional[str] = None,
        environment: Optional[Dict[str, str]] = None,
        session_name: Optional[str] = None,
        mount_local: bool = True,
        volumes: Optional[Dict[str, Dict[str, str]]] = None,
        networks: Optional[List[str]] = None,
    ) -> Optional[Session]:
        """Create a new MC session

        Args:
            driver_name: The name of the driver to use
            project: Optional project repository URL
            environment: Optional environment variables
            session_name: Optional session name
            mount_local: Whether to mount the current directory to /app
            volumes: Optional additional volumes to mount (dict of {host_path: {"bind": container_path, "mode": mode}})
            networks: Optional list of additional Docker networks to connect to
        """
        try:
            # Validate driver exists
            driver = self.config_manager.get_driver(driver_name)
            if not driver:
                print(f"Driver '{driver_name}' not found")
                return None

            # Generate session ID and name
            session_id = self._generate_session_id()
            if not session_name:
                session_name = f"mc-{session_id}"

            # Ensure network exists
            self._ensure_network()

            # Prepare environment variables
            env_vars = environment or {}

            # Add project URL to environment if provided
            if project:
                env_vars["MC_PROJECT_URL"] = project

            # Pass API keys from host environment to container for local development
            api_keys = [
                "OPENAI_API_KEY",
                "ANTHROPIC_API_KEY",
                "OPENROUTER_API_KEY",
                "LANGFUSE_INIT_PROJECT_PUBLIC_KEY",
                "LANGFUSE_INIT_PROJECT_SECRET_KEY",
                "LANGFUSE_URL",
            ]
            for key in api_keys:
                if key in os.environ and key not in env_vars:
                    env_vars[key] = os.environ[key]

            # Pull image if needed
            try:
                self.client.images.get(driver.image)
            except ImageNotFound:
                print(f"Pulling image {driver.image}...")
                self.client.images.pull(driver.image)

            # Set up volume mounts
            session_volumes = {}

            # If project URL is provided, don't mount local directory (will clone into /app)
            # If no project URL and mount_local is True, mount local directory to /app
            if not project and mount_local:
                # Mount current directory to /app in the container
                current_dir = os.getcwd()
                session_volumes[current_dir] = {"bind": "/app", "mode": "rw"}
                print(f"Mounting local directory {current_dir} to /app")
            elif project:
                print(
                    f"Project URL provided - container will clone {project} into /app during initialization"
                )

            # Add user-specified volumes
            if volumes:
                for host_path, mount_spec in volumes.items():
                    container_path = mount_spec["bind"]
                    # Check for conflicts with /app mount
                    if container_path == "/app" and not project and mount_local:
                        print(
                            "[yellow]Warning: Volume mount to /app conflicts with automatic local directory mount. User-specified mount takes precedence.[/yellow]"
                        )
                        # Remove the automatic mount if there's a conflict
                        if current_dir in session_volumes:
                            del session_volumes[current_dir]

                    # Add the volume
                    session_volumes[host_path] = mount_spec
                    print(f"Mounting volume: {host_path} -> {container_path}")

            # Set up persistent project configuration
            project_config_path = self._get_project_config_path(project)
            print(f"Using project configuration directory: {project_config_path}")

            # Mount the project configuration directory
            session_volumes[str(project_config_path)] = {
                "bind": "/mc-config",
                "mode": "rw",
            }

            # Add environment variables for config path
            env_vars["MC_CONFIG_DIR"] = "/mc-config"
            env_vars["MC_DRIVER_CONFIG_DIR"] = f"/mc-config/{driver_name}"

            # Create driver-specific config directories and set up direct volume mounts
            if driver.persistent_configs:
                print("Setting up persistent configuration directories:")
                for config in driver.persistent_configs:
                    # Get target directory path on host
                    target_dir = project_config_path / config.target.removeprefix(
                        "/mc-config/"
                    )

                    # Create directory if it's a directory type config
                    if config.type == "directory":
                        dir_existed = target_dir.exists()
                        target_dir.mkdir(parents=True, exist_ok=True)
                        if not dir_existed:
                            print(f"  - Created directory: {target_dir}")
                    # For files, make sure parent directory exists
                    elif config.type == "file":
                        target_dir.parent.mkdir(parents=True, exist_ok=True)
                        # File will be created by the container if needed

                    # Mount persistent config directly to container path
                    session_volumes[str(target_dir)] = {
                        "bind": config.source,
                        "mode": "rw",
                    }
                    print(
                        f"  - Created direct volume mount: {target_dir} -> {config.source}"
                    )

            # Default MC network
            default_network = self.config_manager.config.docker.get(
                "network", "mc-network"
            )

            # Create container with default MC network
            container = self.client.containers.create(
                image=driver.image,
                name=session_name,
                hostname=session_name,
                detach=True,
                tty=True,
                stdin_open=True,
                environment=env_vars,
                volumes=session_volumes,
                labels={
                    "mc.session": "true",
                    "mc.session.id": session_id,
                    "mc.session.name": session_name,
                    "mc.driver": driver_name,
                    "mc.project": project or "",
                },
                network=default_network,
                ports={f"{port}/tcp": None for port in driver.ports},
            )

            # Start container
            container.start()

            # Connect to additional networks if specified
            if networks:
                for network_name in networks:
                    try:
                        # Get or create the network
                        try:
                            network = self.client.networks.get(network_name)
                        except DockerException:
                            print(f"Network '{network_name}' not found, creating it...")
                            network = self.client.networks.create(
                                network_name, driver="bridge"
                            )

                        # Connect the container to the network
                        network.connect(container)
                        print(f"Connected to network: {network_name}")
                    except DockerException as e:
                        print(f"Error connecting to network {network_name}: {e}")

            # Get updated port information
            container.reload()
            ports = {}
            if container.attrs.get("NetworkSettings", {}).get("Ports"):
                for container_port, host_ports in container.attrs["NetworkSettings"][
                    "Ports"
                ].items():
                    if host_ports:
                        container_port_num = int(container_port.split("/")[0])
                        host_port = int(host_ports[0]["HostPort"])
                        ports[container_port_num] = host_port

            # Create session object
            session = Session(
                id=session_id,
                name=session_name,
                driver=driver_name,
                status=SessionStatus.RUNNING,
                container_id=container.id,
                environment=env_vars,
                project=project,
                created_at=container.attrs["Created"],
                ports=ports,
            )

            # Save session to the session manager as JSON-compatible dict
            self.session_manager.add_session(
                session_id, session.model_dump(mode="json")
            )

            return session

        except DockerException as e:
            print(f"Error creating session: {e}")
            return None

    def close_session(self, session_id: str) -> bool:
        """Close a MC session"""
        try:
            sessions = self.list_sessions()
            for session in sessions:
                if session.id == session_id:
                    return self._close_single_session(session)

            print(f"Session '{session_id}' not found")
            return False

        except DockerException as e:
            print(f"Error closing session: {e}")
            return False

    def connect_session(self, session_id: str) -> bool:
        """Connect to a running MC session"""
        try:
            sessions = self.list_sessions()
            for session in sessions:
                if session.id == session_id and session.container_id:
                    if session.status != SessionStatus.RUNNING:
                        print(f"Session '{session_id}' is not running")
                        return False

                    # Execute interactive shell in container
                    # The init-status.sh script will automatically show logs if needed
                    os.system(f"docker exec -it {session.container_id} /bin/bash")
                    return True

            print(f"Session '{session_id}' not found")
            return False

        except DockerException as e:
            print(f"Error connecting to session: {e}")
            return False

    def _close_single_session(self, session: Session) -> bool:
        """Close a single session (helper for parallel processing)

        Args:
            session: The session to close

        Returns:
            bool: Whether the session was successfully closed
        """
        if not session.container_id:
            return False

        try:
            container = self.client.containers.get(session.container_id)
            container.stop()
            container.remove()
            self.session_manager.remove_session(session.id)
            return True
        except DockerException as e:
            print(f"Error closing session {session.id}: {e}")
            return False

    def close_all_sessions(self, progress_callback=None) -> Tuple[int, bool]:
        """Close all MC sessions with parallel processing and progress reporting

        Args:
            progress_callback: Optional callback function to report progress
                The callback should accept (session_id, status, message)

        Returns:
            tuple: (number of sessions closed, success)
        """
        try:
            sessions = self.list_sessions()
            if not sessions:
                return 0, True

            # No need for session status as we receive it via callback

            # Define a wrapper to track progress
            def close_with_progress(session):
                if not session.container_id:
                    return False

                try:
                    container = self.client.containers.get(session.container_id)
                    # Stop and remove container
                    container.stop()
                    container.remove()
                    # Remove from session storage
                    self.session_manager.remove_session(session.id)

                    # Notify about completion
                    if progress_callback:
                        progress_callback(
                            session.id,
                            "completed",
                            f"{session.name} closed successfully",
                        )

                    return True
                except DockerException as e:
                    error_msg = f"Error: {str(e)}"
                    if progress_callback:
                        progress_callback(session.id, "failed", error_msg)
                    print(f"Error closing session {session.id}: {e}")
                    return False

            # Use ThreadPoolExecutor to close sessions in parallel
            with concurrent.futures.ThreadPoolExecutor(
                max_workers=min(10, len(sessions))
            ) as executor:
                # Submit all session closing tasks
                future_to_session = {
                    executor.submit(close_with_progress, session): session
                    for session in sessions
                }

                # Collect results
                closed_count = 0
                for future in concurrent.futures.as_completed(future_to_session):
                    session = future_to_session[future]
                    try:
                        success = future.result()
                        if success:
                            closed_count += 1
                    except Exception as e:
                        print(f"Error closing session {session.id}: {e}")

            return closed_count, closed_count > 0

        except DockerException as e:
            print(f"Error closing all sessions: {e}")
            return 0, False

    def get_session_logs(self, session_id: str, follow: bool = False) -> Optional[str]:
        """Get logs from a MC session"""
        try:
            sessions = self.list_sessions()
            for session in sessions:
                if session.id == session_id and session.container_id:
                    container = self.client.containers.get(session.container_id)
                    if follow:
                        for line in container.logs(stream=True, follow=True):
                            print(line.decode().strip())
                        return None
                    else:
                        return container.logs().decode()

            print(f"Session '{session_id}' not found")
            return None

        except DockerException as e:
            print(f"Error getting session logs: {e}")
            return None

    def get_init_logs(self, session_id: str, follow: bool = False) -> Optional[str]:
        """Get initialization logs from a MC session

        Args:
            session_id: The session ID
            follow: Whether to follow the logs

        Returns:
            The logs as a string, or None if there was an error
        """
        try:
            sessions = self.list_sessions()
            for session in sessions:
                if session.id == session_id and session.container_id:
                    container = self.client.containers.get(session.container_id)

                    # Check if initialization is complete
                    init_complete = False
                    try:
                        exit_code, output = container.exec_run(
                            "grep -q 'INIT_COMPLETE=true' /init.status"
                        )
                        init_complete = exit_code == 0
                    except DockerException:
                        pass

                    if follow and not init_complete:
                        print(
                            f"Following initialization logs for session {session_id}..."
                        )
                        print("Press Ctrl+C to stop following")
                        container.exec_run(
                            "tail -f /init.log", stream=True, demux=True, tty=True
                        )
                        return None
                    else:
                        exit_code, output = container.exec_run("cat /init.log")
                        if exit_code == 0:
                            return output.decode()
                        else:
                            print("No initialization logs found")
                            return None

            print(f"Session '{session_id}' not found")
            return None

        except DockerException as e:
            print(f"Error getting initialization logs: {e}")
            return None