import argparse
import logging
from pathlib import Path

import multiaddr
import trio

import libp2p
from libp2p import (
    generate_new_ed25519_identity,
    load_keypair,
    new_host,
    save_keypair,
)
from libp2p.abc import INetStream
from libp2p.crypto.x25519 import create_new_key_pair as create_new_x25519_key_pair
from libp2p.custom_types import (
    TProtocol,
)
from libp2p.identity.identify.identify import (
    ID as IDENTIFY_PROTOCOL_ID,
    identify_handler_for,
)
from libp2p.peer.peerinfo import (
    info_from_p2p_addr,
)
from libp2p.security.noise.transport import (
    PROTOCOL_ID as NOISE_PROTOCOL_ID,
    Transport as NoiseTransport,
)
from libp2p.security.tls.transport import (
    PROTOCOL_ID as TLS_PROTOCOL_ID,
    TLSTransport,
)
import libp2p.utils
import libp2p.utils.paths

# Configure logging to show debug logs
root = logging.getLogger()
root.handlers.clear()
root.setLevel(logging.WARNING)

handler = logging.StreamHandler()
handler.setLevel(logging.DEBUG)
handler.setFormatter(logging.Formatter("[%(levelname)s] %(name)s: %(message)s"))

for name in [
    "root",
    "libp2p.network.basic_host",
    "libp2p.security.tls",
    "libp2p.autotls.acme",
    "libp2p.autotls.broker",
]:
    logger = logging.getLogger(name)
    logger.setLevel(logging.INFO)
    logger.addHandler(handler)
    logger.propagate = False


PING_PROTOCOL_ID = TProtocol("/ipfs/ping/1.0.0")
PING_LENGTH = 32
RESP_TIMEOUT = 60
PSK = "dffb7e3135399a8b1612b2aaca1c36a3a8ac2cd0cca51ceeb2ced87d308cac6d"
DIRECTORY = {}
ACME_DIRECTORY_URL = "https://acme-staging-v02.api.letsencrypt.org/directory"
PEER_ID_AUTH_SCHEME = "libp2p-PeerID="


async def handle_ping(stream: INetStream) -> None:
    while True:
        try:
            payload = await stream.read(PING_LENGTH)
            peer_id = stream.muxed_conn.peer_id
            if payload is not None:
                print(f"received ping from {peer_id}")

                await stream.write(payload)
                print(f"responded with pong to {peer_id}")

        except Exception:
            await stream.reset()
            break


async def send_ping(stream: INetStream) -> None:
    try:
        payload = b"\x01" * PING_LENGTH
        print(f"sending ping to {stream.muxed_conn.peer_id}")

        await stream.write(payload)

        with trio.fail_after(RESP_TIMEOUT):
            response = await stream.read(PING_LENGTH)

        if response == payload:
            print(f"received pong from {stream.muxed_conn.peer_id}")

    except Exception as e:
        print(f"error occurred : {e}")


async def run(port: int, destination: str, new: int, transport: str, tls: int) -> None:
    from libp2p.utils.address_validation import (
        find_free_port,
        get_available_interfaces,
    )

    # Create a libp2p-forge directory for persisting keys and certificates
    # Currently the config is for 2 peers exchanging ping/pong
    base = Path("libp2p-forge")
    (base / "peer1").mkdir(parents=True, exist_ok=True)
    (base / "peer2").mkdir(parents=True, exist_ok=True)

    enable_autotls = True
    if tls == 1:
        enable_autotls = False

    if port <= 0:
        port = find_free_port()

    if transport == "tcp":
        listen_addrs = get_available_interfaces(port)
    elif transport == "ws":
        listen_addrs = [multiaddr.Multiaddr(f"/ip4/127.0.0.1/tcp/{port}/ws")]
    elif transport == "quic":
        # QUIC uses UDP addresses with /quic-v1 suffix
        quic_addrs = []
        for addr in get_available_interfaces(port):
            addr_str = str(addr).replace("/tcp/", "/udp/") + "/quic-v1"
            quic_addrs.append(multiaddr.Multiaddr(addr_str))
        listen_addrs = quic_addrs
    else:
        raise ValueError(f"Unknown transport: {transport}. Use tcp, ws, or quic.")

    if new == 1:
        libp2p.utils.paths.ED25519_PATH = Path("libp2p-forge/peer2/ed25519.pem")
        libp2p.utils.paths.AUTOTLS_CERT_PATH = Path(
            "libp2p-forge/peer2/autotls-cert.pem"
        )
        libp2p.utils.paths.AUTOTLS_KEY_PATH = Path("libp2p-forge/peer2/autotls-key.pem")

    key_pair = load_keypair()

    if key_pair:
        logging.info("Loaded existing key-pair")
    else:
        logging.info("Generated new key-pair...")
        key_pair = generate_new_ed25519_identity()
        save_keypair(key_pair)

    noise_key_pair = create_new_x25519_key_pair()
    noise_transport = NoiseTransport(key_pair, noise_privkey=noise_key_pair.private_key)
    tls_transport = TLSTransport(key_pair, enable_autotls=enable_autotls)

    security_options = {
        TLS_PROTOCOL_ID: tls_transport,
        NOISE_PROTOCOL_ID: noise_transport,
    }

    # Create host with QUIC support if transport is quic
    enable_quic = transport == "quic"

    host = new_host(
        key_pair=key_pair,
        listen_addrs=listen_addrs,
        sec_opt=security_options,
        enable_autotls=enable_autotls,
        enable_quic=enable_quic,
    )

    base_identify_handler = identify_handler_for(host, use_varint_format=False)
    async with host.run(listen_addrs=listen_addrs), trio.open_nursery() as nursery:
        # Start the peer-store cleanup task
        nursery.start_soon(host.get_peerstore().start_cleanup_task, 60)

        if not destination:
            host.set_stream_handler(IDENTIFY_PROTOCOL_ID, base_identify_handler)
            host.set_stream_handler(PING_PROTOCOL_ID, handle_ping)

            # Replace/remove this hardcoded IP when running on you own servers
            # Check this function to more info: `inititate_autotls_procedure`
            if enable_autotls:
                await host.initiate_autotls_procedure(public_ip="13.126.88.127")

            all_addrs = host.get_addrs()
            print("Listener ready, listening on:\n")
            for addr in all_addrs:
                print(f"{addr}")

            all_addrs = host.get_addrs()
            if all_addrs:
                print(
                    f"\nRun this from the same folder in another console:\n\n"
                    f"autotls-demo -d {all_addrs[0]} -new 1 -t {transport} -tls {tls}\n"
                )
            else:
                print("\nWarning: No listening addresses available")
            print("Waiting for incoming connection...")

        else:
            all_addrs = host.get_addrs()
            print("Listener ready, listening on:\n")
            for addr in all_addrs:
                print(f"{addr}")
            print("\n\n")

            host.set_stream_handler(IDENTIFY_PROTOCOL_ID, base_identify_handler)

            # Replace/remove this hardcoded IP when running on you own servers
            # Check this function to more info: `inititate_autotls_procedure`
            if enable_autotls:
                await host.initiate_autotls_procedure(public_ip="13.126.88.127")

            maddr = multiaddr.Multiaddr(destination)
            info = info_from_p2p_addr(maddr)
            await host.connect(info)
            stream = await host.new_stream(info.peer_id, [PING_PROTOCOL_ID])

            nursery.start_soon(send_ping, stream)
            return

        await trio.sleep_forever()


def main() -> None:
    description = """
    This program demonstrates a simple p2p ping application using libp2p.
    To use it, first run 'python ping.py -p <PORT>', where <PORT> is the port number.
    Then, run another instance with 'python ping.py -p <ANOTHER_PORT> -d <DESTINATION>',
    where <DESTINATION> is the multiaddress of the previous listener host.
    """

    example_maddr = (
        "/ip4/[HOST_IP]/tcp/8000/p2p/QmQn4SwGkDZKkUEpBRBvTmheQycxAHJUNmVEnjA2v1qe8Q"
    )

    parser = argparse.ArgumentParser(description=description)
    parser.add_argument("-p", "--port", default=0, type=int, help="source port number")

    parser.add_argument(
        "-d",
        "--destination",
        type=str,
        help=f"destination multiaddr string, e.g. {example_maddr}",
    )

    parser.add_argument("-new", "--new", default=0, type=int, help="Run client")

    parser.add_argument(
        "-tls", "--tls", default=0, type=int, help="Run with self-signed TLS handshake"
    )

    parser.add_argument(
        "-t",
        "--transport",
        default="tcp",
        type=str,
        help="Choose the transport layer: tcp, ws, or quic",
    )

    args = parser.parse_args()

    try:
        trio.run(
            run, *(args.port, args.destination, args.new, args.transport, args.tls)
        )
    except KeyboardInterrupt:
        pass


if __name__ == "__main__":
    main()