from pr.multiplexer import get_multiplexer
from pr.tools.interactive_control import (
    close_interactive_session,
    get_session_status,
    list_active_sessions,
    read_session_output,
    send_input_to_session,
)
from pr.tools.prompt_detection import get_global_detector
from pr.ui import Colors


def show_sessions(args=None):
    """Show all active multiplexer sessions."""
    sessions = list_active_sessions()

    if not sessions:
        print(f"{Colors.YELLOW}No active sessions.{Colors.RESET}")
        return

    print(f"{Colors.BOLD}Active Sessions:{Colors.RESET}")
    print("-" * 80)

    for session_name, session_data in sessions.items():
        metadata = session_data["metadata"]
        output_summary = session_data["output_summary"]

        status = get_session_status(session_name)
        is_active = status.get("is_active", False) if status else False

        status_color = Colors.GREEN if is_active else Colors.RED
        print(
            f"{Colors.CYAN}{session_name}{Colors.RESET}: {status_color}{metadata.get('process_type', 'unknown')}{Colors.RESET}"
        )

        if status and "pid" in status:
            print(f"  PID: {status['pid']}")

        print(f"  Age: {metadata.get('start_time', 0):.1f}s")
        print(
            f"  Output: {output_summary['stdout_lines']} stdout, {output_summary['stderr_lines']} stderr lines"
        )
        print(f"  Interactions: {metadata.get('interaction_count', 0)}")
        print(f"  State: {metadata.get('state', 'unknown')}")
        print()


def attach_session(args):
    """Attach to a session (show its output and allow interaction)."""
    if not args or len(args) < 1:
        print(f"{Colors.RED}Usage: attach_session <session_name>{Colors.RESET}")
        return

    session_name = args[0]
    status = get_session_status(session_name)

    if not status:
        print(f"{Colors.RED}Session '{session_name}' not found.{Colors.RESET}")
        return

    print(f"{Colors.BOLD}Attaching to session: {session_name}{Colors.RESET}")
    print(f"Process type: {status.get('metadata', {}).get('process_type', 'unknown')}")
    print("-" * 50)

    # Show recent output
    try:
        output = read_session_output(session_name, lines=20)
        if output["stdout"]:
            print(f"{Colors.GRAY}Recent stdout:{Colors.RESET}")
            for line in output["stdout"].split("\n"):
                if line.strip():
                    print(f"  {line}")
        if output["stderr"]:
            print(f"{Colors.YELLOW}Recent stderr:{Colors.RESET}")
            for line in output["stderr"].split("\n"):
                if line.strip():
                    print(f"  {line}")
    except Exception as e:
        print(f"{Colors.RED}Error reading output: {e}{Colors.RESET}")

    print(
        f"\n{Colors.CYAN}Session is {'active' if status.get('is_active') else 'inactive'}{Colors.RESET}"
    )


def detach_session(args):
    """Detach from a session (stop showing its output but keep it running)."""
    if not args or len(args) < 1:
        print(f"{Colors.RED}Usage: detach_session <session_name>{Colors.RESET}")
        return

    session_name = args[0]
    mux = get_multiplexer(session_name)

    if not mux:
        print(f"{Colors.RED}Session '{session_name}' not found.{Colors.RESET}")
        return

    # In this implementation, detaching just means we stop displaying output
    # The session continues to run in the background
    mux.show_output = False
    print(
        f"{Colors.GREEN}Detached from session '{session_name}'. It continues running in background.{Colors.RESET}"
    )


def kill_session(args):
    """Kill a session forcefully."""
    if not args or len(args) < 1:
        print(f"{Colors.RED}Usage: kill_session <session_name>{Colors.RESET}")
        return

    session_name = args[0]

    try:
        close_interactive_session(session_name)
        print(f"{Colors.GREEN}Session '{session_name}' terminated.{Colors.RESET}")
    except Exception as e:
        print(f"{Colors.RED}Error terminating session '{session_name}': {e}{Colors.RESET}")


def send_command(args):
    """Send a command to a session."""
    if not args or len(args) < 2:
        print(f"{Colors.RED}Usage: send_command <session_name> <command>{Colors.RESET}")
        return

    session_name = args[0]
    command = " ".join(args[1:])

    try:
        send_input_to_session(session_name, command)
        print(f"{Colors.GREEN}Sent command to '{session_name}': {command}{Colors.RESET}")
    except Exception as e:
        print(f"{Colors.RED}Error sending command to '{session_name}': {e}{Colors.RESET}")


def show_session_log(args):
    """Show the full log/output of a session."""
    if not args or len(args) < 1:
        print(f"{Colors.RED}Usage: show_session_log <session_name>{Colors.RESET}")
        return

    session_name = args[0]

    try:
        output = read_session_output(session_name)  # Get all output
        print(f"{Colors.BOLD}Full log for session: {session_name}{Colors.RESET}")
        print("=" * 80)

        if output["stdout"]:
            print(f"{Colors.GRAY}STDOUT:{Colors.RESET}")
            print(output["stdout"])
            print()

        if output["stderr"]:
            print(f"{Colors.YELLOW}STDERR:{Colors.RESET}")
            print(output["stderr"])
            print()

    except Exception as e:
        print(f"{Colors.RED}Error reading log for '{session_name}': {e}{Colors.RESET}")


def show_session_status(args):
    """Show detailed status of a session."""
    if not args or len(args) < 1:
        print(f"{Colors.RED}Usage: show_session_status <session_name>{Colors.RESET}")
        return

    session_name = args[0]
    status = get_session_status(session_name)

    if not status:
        print(f"{Colors.RED}Session '{session_name}' not found.{Colors.RESET}")
        return

    print(f"{Colors.BOLD}Status for session: {session_name}{Colors.RESET}")
    print("-" * 50)

    metadata = status.get("metadata", {})
    print(f"Process type: {metadata.get('process_type', 'unknown')}")
    print(f"Active: {status.get('is_active', False)}")

    if "pid" in status:
        print(f"PID: {status['pid']}")

    print(f"Start time: {metadata.get('start_time', 0):.1f}")
    print(f"Last activity: {metadata.get('last_activity', 0):.1f}")
    print(f"Interaction count: {metadata.get('interaction_count', 0)}")
    print(f"State: {metadata.get('state', 'unknown')}")

    output_summary = status.get("output_summary", {})
    print(
        f"Output lines: {output_summary.get('stdout_lines', 0)} stdout, {output_summary.get('stderr_lines', 0)} stderr"
    )

    # Show prompt detection info
    detector = get_global_detector()
    session_info = detector.get_session_info(session_name)
    if session_info:
        print(f"Current state: {session_info['current_state']}")
        print(f"Is waiting for input: {session_info['is_waiting']}")


def list_waiting_sessions(args=None):
    """List sessions that appear to be waiting for input."""
    sessions = list_active_sessions()
    detector = get_global_detector()

    waiting_sessions = []
    for session_name in sessions:
        if detector.is_waiting_for_input(session_name):
            waiting_sessions.append(session_name)

    if not waiting_sessions:
        print(f"{Colors.GREEN}No sessions are currently waiting for input.{Colors.RESET}")
        return

    print(f"{Colors.BOLD}Sessions waiting for input:{Colors.RESET}")
    for session_name in waiting_sessions:
        status = get_session_status(session_name)
        if status:
            process_type = status.get("metadata", {}).get("process_type", "unknown")
            print(f"  {Colors.CYAN}{session_name}{Colors.RESET} ({process_type})")

            # Show suggestions
            session_info = detector.get_session_info(session_name)
            if session_info:
                suggestions = detector.get_response_suggestions({}, process_type)
                if suggestions:
                    print(f"    Suggested inputs: {', '.join(suggestions[:3])}")  # Show first 3
        print()


# Command registry for the multiplexer commands
MULTIPLEXER_COMMANDS = {
    "show_sessions": show_sessions,
    "attach_session": attach_session,
    "detach_session": detach_session,
    "kill_session": kill_session,
    "send_command": send_command,
    "show_session_log": show_session_log,
    "show_session_status": show_session_status,
    "list_waiting_sessions": list_waiting_sessions,
}