#!/usr/bin/env python3
import gzip
import logging
import os
import platform
import signal
import subprocess
import sys
import tempfile
import time
from pathlib import Path

import click

import trezorlib.debuglink
import trezorlib.device
from trezorlib._internal.emulator import CoreEmulator

try:
    import inotify.adapters
except Exception:
    inotify = None


HERE = Path(__file__).parent.resolve()
MICROPYTHON = HERE / "build" / "unix" / "micropython"
SRC_DIR = HERE / "src"
SD_CARD_GZ = HERE / "trezor.sdcard.gz"

PROFILING_WRAPPER = HERE / "prof" / "prof.py"

PROFILE_BASE = Path.home() / ".trezoremu"


def run_command_with_emulator(emulator, command):
    with emulator:
        # first start the subprocess
        process = subprocess.Popen(command)
        # After the subprocess is started, ignore SIGINT in parent
        # (so that we don't need to handle KeyboardInterrupts)
        signal.signal(signal.SIGINT, signal.SIG_IGN)
        # SIGINTs will be sent to all children by the OS, so we should be able to safely
        # wait for their exit.
        return process.wait()


def run_emulator(emulator):
    with emulator:
        signal.signal(signal.SIGINT, signal.SIG_IGN)
        return emulator.wait()


def watch_emulator(emulator):
    watch = inotify.adapters.InotifyTree(str(SRC_DIR))
    try:
        for _, type_names, _, _ in watch.event_gen(yield_nones=False):
            if "IN_CLOSE_WRITE" in type_names:
                emulator.restart()
    except KeyboardInterrupt:
        emulator.stop()
    return 0


def run_debugger(emulator):
    os.chdir(emulator.workdir)
    env = emulator.make_env()
    if platform.system() == "Darwin":
        env["PATH"] = "/usr/bin"
        os.execvpe(
            "lldb",
            ["lldb", "-f", emulator.executable, "--"] + emulator.make_args(),
            env,
        )
    else:
        os.execvpe(
            "gdb", ["gdb", "--args", emulator.executable] + emulator.make_args(), env
        )


def _from_env(name):
    return os.environ.get(name) == "1"


@click.command(context_settings=dict(ignore_unknown_options=True))
# fmt: off
@click.option("-a", "--disable-animation/--enable-animation", default=_from_env("TREZOR_DISABLE_ANIMATION"), help="Disable animation")
@click.option("-c", "--command", "run_command", is_flag=True, help="Run command while emulator is running")
@click.option("-d", "--production/--no-production", default=_from_env("PYOPT"), help="Production mode (debuglink disabled)")
@click.option("-D", "--debugger", is_flag=True, help="Run emulator in debugger (gdb/lldb)")
@click.option("--executable", type=click.Path(exists=True, dir_okay=False), default=os.environ.get("MICROPYTHON"), help="Alternate emulator executable")
@click.option("-g", "--profiling/--no-profiling", default=_from_env("TREZOR_PROFILING"), help="Run with profiler wrapper")
@click.option("-h", "--headless", is_flag=True, help="Headless mode (no display)")
@click.option("--heap-size", metavar="SIZE", default="20M", help="Configure heap size")
@click.option("--main", help="Path to python main file")
@click.option("--mnemonic", "mnemonics", multiple=True, help="Initialize device with given mnemonic. Specify multiple times for Shamir shares.")
@click.option("--log-memory/--no-log-memory", default=_from_env("TREZOR_LOG_MEMORY"), help="Print memory usage after workflows")
@click.option("-o", "--output", type=click.File("w"), default="-", help="Redirect emulator output to file")
@click.option("-p", "--profile", metavar="NAME", help="Profile name or path")
@click.option("-P", "--port", metavar="PORT", type=int, default=int(os.environ.get("TREZOR_UDP_PORT", 0)) or None, help="UDP port number")
@click.option("-q", "--quiet", is_flag=True, help="Silence emulator output")
@click.option("-s", "--slip0014", is_flag=True, help="Initialize device with SLIP-14 seed (all all all...)")
@click.option("-t", "--temporary-profile", is_flag=True, help="Create an empty temporary profile")
@click.option("-w", "--watch", is_flag=True, help="Restart emulator if sources change")
@click.option("-X", "--extra-arg", "extra_args", multiple=True, help="Extra argument to pass to micropython")
# fmt: on
@click.argument("command", nargs=-1, type=click.UNPROCESSED)
def cli(
    disable_animation,
    run_command,
    production,
    debugger,
    executable,
    profiling,
    headless,
    heap_size,
    main,
    mnemonics,
    log_memory,
    profile,
    port,
    output,
    quiet,
    slip0014,
    temporary_profile,
    watch,
    extra_args,
    command,
):
    """Run the trezor-core emulator.

    If -c is specified, extra arguments are treated as a command that is executed with
    the running emulator. This command can access the following environment variables:
    
    \b
    TREZOR_PROFILE_DIR - path to storage directory
    TREZOR_PATH - trezorlib connection string
    TREZOR_UDP_PORT - UDP port on which the emulator listens
    TREZOR_FIDO2_UDP_PORT - UDP port for FIDO2

    By default, emulator output goes to stdout. If silenced with -q, it is redirected
    to $TREZOR_PROFILE_DIR/trezor.log. You can also specify a custom path with -o.
    """
    if executable:
        executable = Path(executable)
    else:
        executable = MICROPYTHON

    if command and not run_command:
        raise click.ClickException("Extra arguments found. Did you mean to use -c?")

    if watch and (command or debugger):
        raise click.ClickException("Cannot use -w together with -c or -D")

    if watch and inotify is None:
        raise click.ClickException("inotify module is missing, install with pip")

    if main and profiling:
        raise click.ClickException("Cannot use --main and -g together")

    if slip0014 and mnemonics:
        raise click.ClickException("Cannot use -s and --mnemonic together")

    if slip0014:
        mnemonics = [" ".join(["all"] * 12)]

    if mnemonics and debugger:
        raise click.ClickException("Cannot load mnemonics when running in debugger")

    if mnemonics and production:
        raise click.ClickException("Cannot load mnemonics in production mode")

    if profiling:
        main_args = [str(PROFILING_WRAPPER)]
    elif main:
        main_args = [main]
    else:
        main_args = ["-m", "main"]

    if profile and temporary_profile:
        raise click.ClickException("Cannot use -p and -t together")

    tempdir = None
    if profile:
        if "/" in profile:
            profile_dir = Path(profile)
        else:
            profile_dir = PROFILE_BASE / profile

    elif temporary_profile:
        tempdir = tempfile.TemporaryDirectory(prefix="trezor-emulator-")
        profile_dir = Path(tempdir.name)
        # unpack empty SD card for faster start-up
        with gzip.open(SD_CARD_GZ, "rb") as gz:
            (profile_dir / "trezor.sdcard").write_bytes(gz.read())

    elif "TREZOR_PROFILE_DIR" in os.environ:
        profile_dir = Path(os.environ["TREZOR_PROFILE_DIR"])

    else:
        profile_dir = Path("/var/tmp")

    if quiet:
        output = None

    logger = logging.getLogger("trezorlib._internal.emulator")
    logger.setLevel(logging.INFO)
    logger.addHandler(logging.StreamHandler())

    emulator = CoreEmulator(
        executable,
        profile_dir,
        logfile=output,
        port=port,
        headless=headless,
        debug=not production,
        extra_args=extra_args,
        main_args=main_args,
        heap_size=heap_size,
        disable_animation=disable_animation,
        workdir=SRC_DIR,
    )

    emulator_env = dict(
        TREZOR_PATH=f"udp:127.0.0.1:{emulator.port}",
        TREZOR_PROFILE_DIR=str(profile_dir.resolve()),
        TREZOR_UDP_PORT=str(emulator.port),
        TREZOR_FIDO2_UDP_PORT=str(emulator.port + 2),
        TREZOR_SRC=str(SRC_DIR),
    )
    os.environ.update(emulator_env)
    for k, v in emulator_env.items():
        click.echo(f"{k}={v}")

    if log_memory:
        os.environ["TREZOR_LOG_MEMORY"] = "1"

    if debugger:
        run_debugger(emulator)
        raise RuntimeError("run_debugger should not return")

    emulator.start()

    if mnemonics:
        if slip0014:
            label = "SLIP-0014"
        elif profile:
            label = profile_dir.name
        else:
            label = "Emulator"

        trezorlib.device.wipe(emulator.client)
        trezorlib.debuglink.load_device(
            emulator.client,
            mnemonics,
            pin=None,
            passphrase_protection=False,
            label=label,
        )

    if run_command:
        ret = run_command_with_emulator(emulator, command)
    elif watch:
        ret = watch_emulator(emulator)
    else:
        ret = run_emulator(emulator)

    if tempdir is not None:
        tempdir.cleanup()
    sys.exit(ret)


if __name__ == "__main__":
    cli()