#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Copyright (c) 2025 The Basicswap developers
# Distributed under the MIT software license, see the accompanying
# file LICENSE or http://www.opensource.org/licenses/mit-license.php.

import os
import select
import subprocess
import time

from basicswap.bin.run import Daemon


def initSimplexClient(args, logger, delay_event):
    logger.info("Initialising Simplex client")

    (pipe_r, pipe_w) = os.pipe()  # subprocess.PIPE is buffered, blocks when read

    if os.name == "nt":
        str_args = " ".join(args)
        p = subprocess.Popen(
            str_args, shell=True, stdin=subprocess.PIPE, stdout=pipe_w, stderr=pipe_w
        )
    else:
        p = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=pipe_w, stderr=pipe_w)

    def readOutput():
        buf = os.read(pipe_r, 1024).decode("utf-8")
        response = None
        # logging.debug(f"simplex-chat output: {buf}")
        if "display name:" in buf:
            logger.debug("Setting display name")
            response = b"user\n"
        else:
            logger.debug(f"Unexpected output: {buf}")
            return
        if response is not None:
            p.stdin.write(response)
            p.stdin.flush()

    try:
        start_time: int = time.time()
        max_wait_seconds: int = 60
        while p.poll() is None:
            if time.time() > start_time + max_wait_seconds:
                raise ValueError("Timed out")
            if os.name == "nt":
                readOutput()
                delay_event.wait(0.1)
                continue
            while len(select.select([pipe_r], [], [], 0)[0]) == 1:
                readOutput()
                delay_event.wait(0.1)
    except Exception as e:
        logger.error(f"initSimplexClient: {e}")
    finally:
        if p.poll() is None:
            p.terminate()
        os.close(pipe_r)
        os.close(pipe_w)
        p.stdin.close()


def startSimplexClient(
    bin_path: str,
    data_path: str,
    server_address: str,
    websocket_port: int,
    logger,
    delay_event,
) -> Daemon:
    logger.info("Starting Simplex client")
    if not os.path.exists(data_path):
        os.makedirs(data_path)

    db_path = os.path.join(data_path, "simplex_client_data")
    args = [bin_path, "-d", db_path, "-s", server_address, "-p", str(websocket_port)]

    if not os.path.exists(db_path):
        # Need to set initial profile through CLI
        # TODO: Must be a better way?
        init_args = args + ["-e", "/help"]  # Run command ro exit client
        initSimplexClient(init_args, logger, delay_event)

    args += ["-l", "debug"]

    opened_files = []
    stdout_dest = open(
        os.path.join(data_path, "simplex_stdout.log"),
        "w",
    )
    opened_files.append(stdout_dest)
    stderr_dest = stdout_dest
    return Daemon(
        subprocess.Popen(
            args,
            shell=False,
            stdin=subprocess.PIPE,
            stdout=stdout_dest,
            stderr=stderr_dest,
            cwd=data_path,
        ),
        opened_files,
    )