#!/usr/bin/env python3
# vim:fileencoding=utf-8
# License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>

import locale
import os
import shutil
import sys
from contextlib import contextmanager, suppress

from .borders import load_borders_program
from .boss import Boss
from .child import set_default_env, openpty, remove_blocking
from .cli import create_opts, parse_args
from .config import cached_values_for, initial_window_size_func
from .constants import (
    appname, beam_cursor_data_file, config_dir, glfw_path, is_macos,
    is_wayland, kitty_exe, logo_data_file
)
from .fast_data_types import (
    GLFW_IBEAM_CURSOR, create_os_window, free_font_data,
    glfw_init, glfw_terminate, load_png_data, set_custom_cursor,
    set_default_window_icon, set_options
)
from .fonts.box_drawing import set_scale
from .fonts.render import set_font_family
from .utils import (
    detach, log_error, single_instance, startup_notification_handler,
    unix_socket_paths
)
from .window import load_shader_programs


def set_custom_ibeam_cursor():
    with open(beam_cursor_data_file, 'rb') as f:
        data = f.read()
    rgba_data, width, height = load_png_data(data)
    c2x = os.path.splitext(beam_cursor_data_file)
    with open(c2x[0] + '@2x' + c2x[1], 'rb') as f:
        data = f.read()
    rgba_data2, width2, height2 = load_png_data(data)
    images = (rgba_data, width, height), (rgba_data2, width2, height2)
    try:
        set_custom_cursor(GLFW_IBEAM_CURSOR, images, 4, 8)
    except Exception as e:
        log_error('Failed to set custom beam cursor with error: {}'.format(e))


def talk_to_instance(args):
    import json
    import socket
    data = {'cmd': 'new_instance', 'args': tuple(sys.argv),
            'startup_id': os.environ.get('DESKTOP_STARTUP_ID'),
            'cwd': os.getcwd()}
    notify_socket = None
    if args.wait_for_single_instance_window_close:
        address = '\0{}-os-window-close-notify-{}-{}'.format(appname, os.getpid(), os.geteuid())
        notify_socket = socket.socket(family=socket.AF_UNIX)
        try:
            notify_socket.bind(address)
        except FileNotFoundError:
            for address in unix_socket_paths(address[1:], ext='.sock'):
                notify_socket.bind(address)
                break
        data['notify_on_os_window_death'] = address
        notify_socket.listen()

    data = json.dumps(data, ensure_ascii=False).encode('utf-8')
    single_instance.socket.sendall(data)
    with suppress(OSError):
        single_instance.socket.shutdown(socket.SHUT_RDWR)
    single_instance.socket.close()

    if args.wait_for_single_instance_window_close:
        conn = notify_socket.accept()[0]
        conn.recv(1)
        with suppress(OSError):
            conn.shutdown(socket.SHUT_RDWR)
        conn.close()


def load_all_shaders(semi_transparent=0):
    load_shader_programs(semi_transparent)
    load_borders_program()


def init_glfw_module(glfw_module, debug_keyboard=False):
    if not glfw_init(glfw_path(glfw_module), debug_keyboard):
        raise SystemExit('GLFW initialization failed')


def init_glfw(opts, debug_keyboard=False):
    glfw_module = 'cocoa' if is_macos else ('wayland' if is_wayland(opts) else 'x11')
    init_glfw_module(glfw_module, debug_keyboard)
    return glfw_module


def get_new_os_window_trigger(opts):
    new_os_window_trigger = None
    if is_macos:
        new_os_window_shortcuts = []
        for k, v in opts.keymap.items():
            if v.func == 'new_os_window':
                new_os_window_shortcuts.append(k)
        if new_os_window_shortcuts:
            from .fast_data_types import cocoa_set_new_window_trigger
            # Reverse list so that later defined keyboard shortcuts take priority over earlier defined ones
            for candidate in reversed(new_os_window_shortcuts):
                if cocoa_set_new_window_trigger(candidate[0], candidate[2]):
                    new_os_window_trigger = candidate
                    break
    return new_os_window_trigger


def _run_app(opts, args, bad_lines=()):
    new_os_window_trigger = get_new_os_window_trigger(opts)
    if is_macos and opts.macos_custom_beam_cursor:
        set_custom_ibeam_cursor()
    if not is_wayland() and not is_macos:  # no window icons on wayland
        with open(logo_data_file, 'rb') as f:
            set_default_window_icon(f.read(), 256, 256)
    load_shader_programs.use_selection_fg = opts.selection_foreground is not None
    with cached_values_for(run_app.cached_values_name) as cached_values:
        with startup_notification_handler(extra_callback=run_app.first_window_callback) as pre_show_callback:
            window_id = create_os_window(
                    run_app.initial_window_size_func(opts, cached_values),
                    pre_show_callback,
                    appname, args.name or args.cls or appname,
                    args.cls or appname, load_all_shaders)
        boss = Boss(window_id, opts, args, cached_values, new_os_window_trigger)
        boss.start()
        if bad_lines:
            boss.show_bad_config_lines(bad_lines)
        try:
            boss.child_monitor.main_loop()
        finally:
            boss.destroy()


def run_app(opts, args, bad_lines=()):
    set_scale(opts.box_drawing_scale)
    set_options(opts, is_wayland(), args.debug_gl, args.debug_font_fallback)
    set_font_family(opts, debug_font_matching=args.debug_font_fallback)
    try:
        _run_app(opts, args, bad_lines)
    finally:
        free_font_data()  # must free font data before glfw/freetype/fontconfig/opengl etc are finalized


run_app.cached_values_name = 'main'
run_app.first_window_callback = lambda window_handle: None
run_app.initial_window_size_func = initial_window_size_func


def ensure_macos_locale():
    # Ensure the LANG env var is set. See
    # https://github.com/kovidgoyal/kitty/issues/90
    from .fast_data_types import cocoa_get_lang
    if 'LANG' not in os.environ:
        lang = cocoa_get_lang()
        if lang is not None:
            os.environ['LANG'] = lang + '.UTF-8'


@contextmanager
def setup_profiling(args):
    try:
        from .fast_data_types import start_profiler, stop_profiler
    except ImportError:
        start_profiler = stop_profiler = None
    if start_profiler is not None:
        start_profiler('/tmp/kitty-profile.log')
    yield
    if stop_profiler is not None:
        import subprocess
        stop_profiler()
        exe = kitty_exe()
        cg = '/tmp/kitty-profile.callgrind'
        print('Post processing profile data for', exe, '...')
        with open(cg, 'wb') as f:
            subprocess.call(['pprof', '--callgrind', exe, '/tmp/kitty-profile.log'], stdout=f)
        try:
            subprocess.Popen(['kcachegrind', cg])
        except FileNotFoundError:
            subprocess.call(['pprof', '--text', exe, '/tmp/kitty-profile.log'])
            print('To view the graphical call data, use: kcachegrind', cg)


def macos_cmdline(argv_args):
    try:
        with open(os.path.join(config_dir, 'macos-launch-services-cmdline')) as f:
            raw = f.read()
    except FileNotFoundError:
        return argv_args
    import shlex
    raw = raw.strip()
    ans = shlex.split(raw)
    if ans and ans[0] == 'kitty':
        del ans[0]
    return ans


def read_shell_environment(opts=None):
    if not hasattr(read_shell_environment, 'ans'):
        ans = read_shell_environment.ans = {}
        import subprocess
        from .session import resolved_shell
        shell = resolved_shell(opts)
        master, slave = openpty()
        remove_blocking(master)
        try:
            p = subprocess.Popen(shell + ['-l', '-c', 'env'], stdout=slave, stdin=slave, stderr=slave, start_new_session=True, close_fds=True)
        except FileNotFoundError:
            log_error('Could not find shell to read environment')
            return ans
        with os.fdopen(master, 'rb') as stdout, os.fdopen(slave, 'wb'):
            raw = b''
            from subprocess import TimeoutExpired
            from time import monotonic
            start_time = monotonic()
            while monotonic() - start_time < 1.5:
                try:
                    ret = p.wait(0.01)
                except TimeoutExpired:
                    ret = None
                with suppress(Exception):
                    raw += stdout.read()
                if ret is not None:
                    break
            if p.returncode is None:
                log_error('Timed out waiting for shell to quit while reading shell environment')
                p.kill()
            elif p.returncode == 0:
                while True:
                    try:
                        x = stdout.read()
                    except Exception:
                        break
                    if not x:
                        break
                    raw += x
                raw = raw.decode('utf-8', 'replace')
                for line in raw.splitlines():
                    k, v = line.partition('=')[::2]
                    if k and v:
                        ans[k] = v
            else:
                log_error('Failed to run shell to read its environment')
    return read_shell_environment.ans


def get_editor_from_env(shell_env):
    for var in ('VISUAL', 'EDITOR'):
        editor = shell_env.get(var)
        if editor:
            if 'PATH' in shell_env:
                import shlex
                editor_cmd = shlex.split(editor)
                if not os.path.isabs(editor_cmd[0]):
                    editor_cmd[0] = shutil.which(editor_cmd[0], path=shell_env['PATH'])
                    if editor_cmd[0]:
                        editor = ' '.join(map(shlex.quote, editor_cmd))
                    else:
                        editor = None
            if editor:
                return editor


def setup_environment(opts, args):
    extra_env = opts.env.copy()
    if opts.editor == '.':
        editor = get_editor_from_env(os.environ)
        if not editor:
            shell_env = read_shell_environment(opts)
            editor = get_editor_from_env(shell_env)
        if editor:
            os.environ['EDITOR'] = editor
    else:
        os.environ['EDITOR'] = opts.editor
    if args.listen_on:
        os.environ['KITTY_LISTEN_ON'] = args.listen_on
    set_default_env(extra_env)


def _main():
    with suppress(AttributeError):  # python compiled without threading
        sys.setswitchinterval(1000.0)  # we have only a single python thread
    if is_macos:
        ensure_macos_locale()
    try:
        locale.setlocale(locale.LC_ALL, '')
    except Exception:
        if not is_macos:
            raise
        log_error('Failed to set locale with LANG:', os.environ.get('LANG'))
        os.environ.pop('LANG', None)
        try:
            locale.setlocale(locale.LC_ALL, '')
        except Exception:
            log_error('Failed to set locale with no LANG, ignoring')

    # Ensure the correct kitty is in PATH
    rpath = sys._xoptions.get('bundle_exe_dir')
    if rpath:
        modify_path = is_macos or getattr(sys, 'frozen', False) or sys._xoptions.get('kitty_from_source') == '1'
        if modify_path or not shutil.which('kitty'):
            existing_paths = list(filter(None, os.environ.get('PATH', '').split(os.pathsep)))
            existing_paths.insert(0, rpath)
            os.environ['PATH'] = os.pathsep.join(existing_paths)

    args = sys.argv[1:]
    if is_macos and os.environ.pop('KITTY_LAUNCHED_BY_LAUNCH_SERVICES', None) == '1':
        os.chdir(os.path.expanduser('~'))
        args = macos_cmdline(args)
    try:
        cwd_ok = os.path.isdir(os.getcwd())
    except Exception:
        cwd_ok = False
    if not cwd_ok:
        os.chdir(os.path.expanduser('~'))
    args, rest = parse_args(args=args)
    args.args = rest
    if args.debug_config:
        create_opts(args, debug_config=True)
        return
    if getattr(args, 'detach', False):
        detach()
    if args.replay_commands:
        from kitty.client import main
        main(args.replay_commands)
        return
    if args.single_instance:
        is_first = single_instance(args.instance_group)
        if not is_first:
            talk_to_instance(args)
            return
    bad_lines = []
    opts = create_opts(args, accumulate_bad_lines=bad_lines)
    init_glfw(opts, args.debug_keyboard)
    setup_environment(opts, args)
    try:
        with setup_profiling(args):
            # Avoid needing to launch threads to reap zombies
            run_app(opts, args, bad_lines)
    finally:
        glfw_terminate()


def main():
    try:
        _main()
    except Exception:
        import traceback
        tb = traceback.format_exc()
        log_error(tb)
        raise SystemExit(1)
