# Copyright (C) 2018 Philipp Hörist <philipp AT hoerist.com>
#
# This file is part of Gajim.
#
# SPDX-License-Identifier: GPL-3.0-or-later

import multiprocessing
import os
import platform
import signal
import sqlite3
import sys
import warnings
from ctypes import byref
from ctypes import CDLL
from ctypes import create_string_buffer
from ctypes.util import find_library
from types import FrameType

from packaging.version import Version as V

_MIN_NBXMPP_VER = "6.0.0"
_MIN_GTK_VER = "4.14.0"
_MIN_CAIRO_VER = "1.16.0"
_MIN_PYGOBJECT_VER = "3.42.0"
_MIN_GLIB_VER = "2.66.0"
_MIN_PANGO_VER = "1.50.0"
_MIN_SQLITE_VER = "3.35.0"


def check_version(dep_name: str, current_ver: str, min_ver: str) -> None:
    if V(current_ver) < V(min_ver):
        sys.exit(
            f"Gajim needs {dep_name} >= {min_ver} "
            f"(found {current_ver}) to run. Quitting..."
        )


def gi_require_versions() -> None:
    import gi

    gi.require_versions(
        {
            "GLib": "2.0",
            "Gio": "2.0",
            "Gdk": "4.0",
            "Gsk": "4.0",
            "Gtk": "4.0",
            "GtkSource": "5",
            "GObject": "2.0",
            "Graphene": "1.0",
            "Pango": "1.0",
            "PangoCairo": "1.0",
        }
    )


def _check_required_deps() -> None:
    error_message = "Gajim needs {0} to run. Quitting… (Error: {1})"

    try:
        import nbxmpp
    except ImportError as error:
        sys.exit(error_message.format("python-nbxmpp", error))

    try:
        import gi
    except ImportError as error:
        sys.exit(error_message.format("pygobject", error))

    try:
        gi_require_versions()
    except ValueError as error:
        sys.exit(f"Missing dependency: {error}")

    try:
        import cairo
    except ImportError as error:
        sys.exit(error_message.format("pycairo", error))

    from gi.repository import Gtk

    gtk_ver = ".".join(
        map(
            str,
            [Gtk.get_major_version(), Gtk.get_minor_version(), Gtk.get_micro_version()],
        )
    )

    from gi.repository import GLib

    glib_ver = ".".join(
        map(str, [GLib.MAJOR_VERSION, GLib.MINOR_VERSION, GLib.MICRO_VERSION])
    )

    from gi.repository import Pango

    check_version("python-nbxmpp", nbxmpp.__version__, _MIN_NBXMPP_VER)
    check_version("pygobject", gi.__version__, _MIN_PYGOBJECT_VER)
    check_version("libcairo", cairo.cairo_version_string(), _MIN_CAIRO_VER)
    check_version("pycairo", cairo.version, _MIN_CAIRO_VER)
    check_version("gtk4", gtk_ver, _MIN_GTK_VER)
    check_version("glib", glib_ver, _MIN_GLIB_VER)
    check_version("pango", Pango.version_string(), _MIN_PANGO_VER)
    check_version("sqlite", sqlite3.sqlite_version, _MIN_SQLITE_VER)


def _init_translations() -> None:
    import gajim.common.i18n

    gajim.common.i18n.init()


def _init_gui(gui: str) -> None:
    if gui == "GTK":
        _init_gtk()


def _set_env_vars() -> None:
    # Disable legacy ciphers in cryptography
    os.environ["CRYPTOGRAPHY_OPENSSL_NO_LEGACY"] = "1"

    if sys.platform != "win32":
        return

    if "GTK_CSD" in os.environ:
        # Respect user settings
        return

    os.environ["GTK_CSD"] = "0"


def _init_gtk() -> None:
    from gajim.gtk import exception

    exception.init()


def _run_app() -> None:
    from gajim.gtk.application import GajimApplication

    application = GajimApplication()

    def sigint_cb(num: int, stack: FrameType | None) -> None:
        print(" SIGINT/SIGTERM received")
        application.quit()

    # ^C exits the application normally
    signal.signal(signal.SIGINT, sigint_cb)
    signal.signal(signal.SIGTERM, sigint_cb)
    if sys.platform != "win32":
        signal.signal(signal.SIGPIPE, signal.SIG_DFL)

    # https://gitlab.gnome.org/GNOME/pygobject/-/issues/12
    warnings.filterwarnings("ignore", ".*g_value_get_int.*G_VALUE_HOLDS_INT", Warning)

    application.run(sys.argv)


def _set_proc_title() -> None:
    sysname = platform.system()
    if sysname in ("Linux", "FreeBSD", "OpenBSD", "NetBSD"):
        libc = CDLL(find_library("c"))

        # The constant defined in <linux/prctl.h> which is used to set the name
        # of the process.
        PR_SET_NAME = 15

        if sysname == "Linux":
            proc_name = b"gajim"
            buff = create_string_buffer(len(proc_name) + 1)
            buff.value = proc_name
            libc.prctl(PR_SET_NAME, byref(buff), 0, 0, 0)
        elif sysname in ("FreeBSD", "OpenBSD", "NetBSD"):
            libc.setproctitle("gajim")


def run() -> None:
    multiprocessing.freeze_support()
    if sys.platform != "win32":
        if os.geteuid() == 0:
            sys.exit("You must not launch gajim as root, it is insecure.")

    _check_required_deps()
    _set_proc_title()
    _set_env_vars()
    _init_translations()
    _init_gui("GTK")
    _run_app()
