"""
Kiwy Signage Player — Linux / Raspberry Pi entry point
------------------------------------------------------
This module prepares a Pi-correct environment, imports the shared application,
then injects the platform-specific behaviour. ``src/main.py`` itself stays
cross-platform and holds no platform patches.

Usage:
    python3 linux/run_linux.py          # development / manual run
    bash linux/start_player.sh          # supervised run (watchdog)

Target: Raspberry Pi OS "Trixie" 64-bit (Debian 13, aarch64, labwc/Wayland).

What this file is responsible for
---------------------------------
1. Environment, set *before* Kivy is imported (video/audio/GL/input backends).
2. ``sys.path`` so the shared modules in ``src/`` import cleanly.
3. Injecting the Linux web-link adapter through the existing
   ``SignagePlayer.weblink_adapter_factory`` hook.
4. Replacing ``signal_screen_activity`` with the Wayland-aware implementation
   in ``linux_display.py`` (the inherited one calls X11 tools absent on Trixie).
5. Pointing ``player_auth.json`` at the player's data directory.
6. A fatal-error surface that works without a console.
"""

import json
import logging
import os
import platform
import sys
import traceback
from pathlib import Path

# =====================================================================
# 0. Resolve directories
# =====================================================================
# Layout: <root>/linux/run_linux.py  ->  <root> is the data directory and
# <root>/src holds the shared modules.
_HERE = Path(__file__).resolve().parent
ROOT_DIR = _HERE.parent
SRC_DIR = ROOT_DIR / 'src'
LOG_DIR = ROOT_DIR / 'logs'

# The shared modules (main, weblink_session, player_auth, ...) live in src/.
if str(SRC_DIR) not in sys.path:
    sys.path.insert(0, str(SRC_DIR))

DATA_DIR = str(ROOT_DIR)
LOG_DIR.mkdir(parents=True, exist_ok=True)

# Consumed by src/playback_trace.py and our own helpers, so trace/log files land
# next to the player rather than in whatever directory it happened to start in.
os.environ.setdefault('KIWY_DATA_DIR', DATA_DIR)


def _early_log(message):
    """Log before Kivy's Logger exists (and mirror to a file)."""
    line = f'[run_linux] {message}'
    print(line, flush=True)
    try:
        with open(LOG_DIR / 'startup.log', 'a') as fh:
            from datetime import datetime
            fh.write(f"{datetime.now().isoformat(timespec='seconds')} {line}\n")
    except Exception:
        pass


def _show_error(message, details=''):
    """Report a fatal start-up failure where an operator can actually see it.

    On a Pi kiosk there is no console and no dialog framework yet (Kivy failed),
    so the text is written to a log AND printed. If a ``zenity``-style dialog is
    available it is used as a bonus, never as a requirement.
    """
    _early_log(f'FATAL: {message}')
    if details:
        _early_log(details)
    try:
        crash_log = LOG_DIR / 'fatal_crash.log'
        with open(crash_log, 'w') as fh:
            fh.write(f'FATAL: {message}\n\n{details}\n')
    except Exception:
        pass
    try:
        import shutil
        import subprocess
        if shutil.which('zenity') and os.environ.get('WAYLAND_DISPLAY'):
            subprocess.Popen(
                ['zenity', '--error', '--width=520',
                 '--title=Kiwy Signage Player',
                 '--text=' + f'{message}\n\nSee logs/fatal_crash.log'],
                stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
            )
    except Exception:
        pass


# =====================================================================
# 1. Environment — must be set BEFORE Kivy is imported
# =====================================================================
# main.py uses os.environ.setdefault(), so values set here win. Anything the
# operator exports explicitly is left untouched (setdefault semantics).
def _configure_environment():
    env = os.environ

    # ── Session environment FIRST ───────────────────────────────────
    # A launch from systemd, cron or SSH has XDG_RUNTIME_DIR set but
    # WAYLAND_DISPLAY *empty* — the compositor only exports it inside the
    # desktop session. SDL2 does NOT scan XDG_RUNTIME_DIR on its own: with the
    # variable unset it fails with "wayland not available" even though the
    # socket exists. Detecting and exporting it here is what makes the player
    # start under systemd/autostart at all.
    try:
        from linux_display import ensure_session_environment

        changed = ensure_session_environment()
        if changed:
            _early_log(f'session environment filled in: {changed}')
    except Exception as exc:
        _early_log(f'session environment detection skipped: {exc}')

    # ── Video output ────────────────────────────────────────────────
    # Raspberry Pi OS Trixie runs a Wayland (labwc) session. A comma-separated
    # list is valid: Kivy splits it and SDL2 picks the first driver that
    # initialises, so this also covers XWayland ('x11') and headless ('dummy').
    env.setdefault('SDL_VIDEODRIVER', 'wayland,x11,dummy')

    # ── Audio ───────────────────────────────────────────────────────
    # Trixie ships PipeWire, which exposes an ALSA compatibility layer and a
    # PulseAudio-compatible socket. NOTE: main.py sets SDL_AUDIODRIVER twice
    # (once via setdefault at import, once with a hard setdefault later), so
    # the value chosen here is the one that sticks.
    env.setdefault('SDL_AUDIODRIVER', 'alsa,pulse,dummy')

    # ── Kivy window / GL ────────────────────────────────────────────
    env.setdefault('KIVY_WINDOW', 'sdl2')
    # Pi 4/5 use Mesa + V3D. 'gl' is the safe default; operators on odd stacks
    # can export KIVY_GL_BACKEND=gles/sdl2 to change it.
    env.setdefault('KIVY_GL_BACKEND', 'gl')
    env.setdefault('KIVY_INPUTPROVIDERS', 'wayland,x11,probesysfs,hidinput,mtdev')

    # ── Media (ffpyplayer, hardware-friendly) ───────────────────────
    env.setdefault('KIVY_VIDEO', 'ffpyplayer')
    env.setdefault('KIVY_AUDIO', 'ffpyplayer')
    env.setdefault('FFPYPLAYER_CODECS', 'h264,h265,vp9,vp8')
    # Pi 4 has 4 cores; more threads than that hurts more than it helps.
    env.setdefault('FFMPEG_THREADS', '2')
    env.setdefault('LIBPLAYER_BUFFER', '1048576')

    # ── Misc ────────────────────────────────────────────────────────
    env.setdefault('SDL_VIDEO_ALLOW_SCREENSAVER', '0')
    # Kivy's own home; keeping it inside the project avoids surprises when the
    # player is started by systemd with a different HOME.
    env.setdefault('KIVY_HOME', str(ROOT_DIR / '.kivy'))


_configure_environment()


# =====================================================================
# 2. Logging
# =====================================================================
def _configure_logging():
    """Route Kivy/root logging to logs/ as well as stderr.

    journald already captures stderr when started by systemd, but a plain
    ``runner`` launch (or a labwc autostart) would otherwise lose it.
    """
    logging.basicConfig(
        level=logging.INFO,
        format='%(asctime)s %(levelname).1s %(name)s: %(message)s',
    )
    try:
        from logging.handlers import RotatingFileHandler
        handler = RotatingFileHandler(
            LOG_DIR / 'player.log', maxBytes=2 * 1024 * 1024, backupCount=2
        )
        handler.setFormatter(
            logging.Formatter('%(asctime)s %(levelname).1s %(name)s: %(message)s')
        )
        logging.getLogger().addHandler(handler)
    except Exception as exc:
        _early_log(f'file logging unavailable: {exc}')


_configure_logging()


# =====================================================================
# 3. Import the shared application (env is already Pi-correct)
# =====================================================================
def _bind_name(func, name):
    """Give ``func`` the name Kivy will use when it resolves the callback later.

    Kivy's ``Clock`` wraps callbacks in a ``WeakMethod`` keyed on
    ``func.__name__`` and re-resolves them with ``getattr(instance, name)``. A
    replacement assigned under a different name than it was defined with
    therefore raises ``AttributeError`` the first time the Clock fires — after
    a delay, far from the cause. Renaming the function keeps the two in sync.
    """
    try:
        func.__name__ = name
        func.__qualname__ = name
    except Exception:
        pass
    return func


def _import_main():
    """Import ``src/main.py``, translating import failures into clear advice."""
    try:
        import main as signage_main  # noqa: WPS433 - deliberate late import
        return signage_main
    except SystemExit as exc:
        # Kivy raises SystemExit(1) when no window provider can be created.
        raise RuntimeError(
            f'Kivy could not create a window (SystemExit {exc.code}).\n'
            'This usually means the display backends are missing.\n'
            'Try:  sudo apt install libsdl2-2.0-0 libgl1-mesa-dri\n'
            f'Backend: SDL_VIDEODRIVER={os.environ.get("SDL_VIDEODRIVER")} '
            f'KIVY_GL_BACKEND={os.environ.get("KIVY_GL_BACKEND")} '
            f'WAYLAND_DISPLAY={os.environ.get("WAYLAND_DISPLAY")} '
            f'DISPLAY={os.environ.get("DISPLAY")}'
        ) from exc


# =====================================================================
# 4. Platform patches
# =====================================================================
def _reassert_graphics_config():
    """Re-apply fullscreen/window config after main.py has run its own.

    ``main.py`` sets ``graphics.fullscreen = 0`` and ``window_state = maximized``
    at import time. On the Pi the window must be a true fullscreen surface, so
    the values are re-asserted here — after main's module body, before
    ``App.run()`` creates the window.
    """
    try:
        from kivy.config import Config

        Config.set('graphics', 'fullscreen', '1')
        Config.set('graphics', 'borderless', '1')
        Config.set('graphics', 'resizable', '0')
        Config.set('graphics', 'multisampling', '0')
        Config.set('graphics', 'fast_rgba', '1')
        Config.set('graphics', 'maxfps', '60')
        Config.set('kivy', 'exit_on_escape', '0')
    except Exception as exc:
        _early_log(f'graphics config re-assert failed (non-fatal): {exc}')


def _patch_display(signage_main):
    """Install the Wayland-aware screen-activity handler.

    ``main.py``'s inherited implementation shells out to ``tvservice``,
    ``xdotool`` and ``ydotool`` — none of which exist on Trixie — and passes a
    mis-escaped ``wlopm --on \\*``. It therefore never prevents blanking.

    NOTE: the replacement is registered under **every** name Kivy might use to
    resolve the callback. Kivy's ``Clock`` stores ``func.__name__`` in a
    WeakMethod and later does ``getattr(instance, that_name)``, so the attribute
    name must match the function's own ``__name__`` exactly — otherwise the
    Clock raises ``AttributeError`` the first time it fires (measured: the
    player died 20 s in, on the first ``signal_screen_activity`` tick, with
    ``'SignagePlayer' object has no attribute 'linux_screen_activity'``).
    """
    try:
        from linux_display import linux_screen_activity
    except ImportError as exc:
        _early_log(f'linux_display unavailable, keeping built-in handler: {exc}')
        return False

    # Own name first: this is what Kivy's WeakMethod will look up.
    setattr(signage_main.SignagePlayer, 'linux_screen_activity', linux_screen_activity)
    # Then the attribute the app actually schedules.
    signage_main.SignagePlayer.signal_screen_activity = linux_screen_activity
    return True


def _patch_weblink_engines(signage_main):
    """Inject the Raspberry Pi Chromium adapter.

    ``WeblinkSession`` owns launch/visibility/interaction/teardown; the adapter
    is the only platform-specific part. Injecting it via the class-level
    ``weblink_adapter_factory`` hook keeps ``main.py`` free of platform code.
    """
    try:
        from linux_browser import LinuxChromiumAdapter, find_linux_browser
    except ImportError as exc:
        _early_log(f'linux_browser unavailable, using the generic adapter: {exc}')
        return False

    from kivy.logger import Logger

    browser = find_linux_browser()

    def _linux_weblink_adapter_factory(player):
        adapters = []
        if browser:
            adapters.append(LinuxChromiumAdapter(browser_path=browser, kiosk=True))
        else:
            Logger.warning(
                'SignagePlayer: no Chromium/Chrome found — web links will be '
                'skipped. Install with: sudo apt install chromium'
            )
        return adapters

    signage_main.SignagePlayer.weblink_adapter_factory = staticmethod(
        _bind_name(_linux_weblink_adapter_factory, 'weblink_adapter_factory')
    )
    Logger.info(
        f'SignagePlayer: web-link engine -> '
        f'{"chromium-kiosk-linux (" + browser + ")" if browser else "none found"}'
    )
    return True


def _patch_temp_paths(signage_main):
    """Make the Settings "Test connection" use a portable temp path.

    ``main.py`` hard-codes ``/tmp/temp_auth_test.json``. That usually works on
    Linux, but the file can be left behind with live credentials and breaks
    outright when ``/tmp`` is private (systemd ``PrivateTmp``) or read-only.
    """
    try:
        import tempfile
        import threading
        from kivy.clock import Clock
        from player_auth import PlayerAuth
    except Exception as exc:
        _early_log(f'temp-path patch skipped: {exc}')
        return False

    def _linux_test_connection(self):
        """Copy of the original flow, using ``tempfile.gettempdir()``."""
        self.ids.connection_status.text = 'Testing connection...'
        self.ids.connection_status.color = (1, 0.7, 0, 1)

        def run_test():
            temp_file = os.path.join(tempfile.gettempdir(), 'temp_auth_test.json')
            try:
                server_ip = self.ids.server_input.text.strip()
                screen_name = self.ids.screen_input.text.strip()
                quickconnect = self.ids.quickconnect_input.text.strip()
                port = self.ids.port_input.text.strip() or self.player.config.get('port', '')
                use_https = self.player.config.get('use_https', True)
                verify_ssl = self.player.config.get('verify_ssl', True)

                if not all([server_ip, screen_name, quickconnect]):
                    Clock.schedule_once(
                        lambda dt: self.update_connection_status('Error: Fill all fields', False)
                    )
                    return

                if server_ip.startswith(('http://', 'https://')):
                    server_url = server_ip
                    if ':' not in server_ip.replace('https://', '').replace('http://', ''):
                        if port and port not in ('443', '80'):
                            server_url = f'{server_ip}:{port}'
                else:
                    protocol = 'https' if use_https else 'http'
                    if ':' in server_ip:
                        server_url = f'{protocol}://{server_ip}'
                    else:
                        server_url = f'{protocol}://{server_ip}:{port}' if port else f'{protocol}://{server_ip}'

                auth = PlayerAuth(temp_file, use_https=use_https, verify_ssl=verify_ssl)
                success, error = auth.authenticate(
                    server_url=server_url, hostname=screen_name,
                    quickconnect_code=quickconnect,
                )

                if success:
                    player_name = auth.get_player_name()
                    Clock.schedule_once(
                        lambda dt: self.update_connection_status(f'✓ Connected: {player_name}', True)
                    )
                else:
                    Clock.schedule_once(
                        lambda dt: self.update_connection_status(f'✗ Failed: {error}', False)
                    )
            except Exception as exc:
                Clock.schedule_once(
                    lambda dt: self.update_connection_status(f'✗ Error: {exc}', False)
                )
            finally:
                # Never leave a file containing credentials behind.
                try:
                    if os.path.exists(temp_file):
                        os.remove(temp_file)
                except Exception:
                    pass

        threading.Thread(target=run_test, daemon=True).start()

    signage_main.SettingsPopup.test_connection = _bind_name(
        _linux_test_connection, 'test_connection'
    )
    return True


def _patch_auth_path(signage_main):
    """Keep ``player_auth.json`` in the player's data directory.

    ``player_auth.py`` defaults to the relative path ``player_auth.json``, which
    resolves against the *current working directory*. Started by systemd,
    labwc-autostart or a cron wrapper, that cwd differs — so the player would
    "forget" its authentication and re-register on every launch. Pinning it to
    an absolute path in the data dir removes that class of bug.
    """
    try:
        import player_auth as player_auth_module
    except Exception as exc:
        _early_log(f'auth-path patch skipped: {exc}')
        return False

    local_auth = os.path.join(DATA_DIR, 'player_auth.json')
    original_init = player_auth_module.PlayerAuth.__init__

    def _linux_auth_init(self, config_file='player_auth.json',
                         use_https=True, verify_ssl=True):
        try:
            if not os.path.isabs(config_file):
                config_file = os.path.join(DATA_DIR, os.path.basename(config_file))
        except Exception:
            config_file = local_auth
        original_init(self, config_file, use_https=use_https, verify_ssl=verify_ssl)

    player_auth_module.PlayerAuth.__init__ = _bind_name(_linux_auth_init, '__init__')
    _early_log(f'player auth file -> {local_auth}')

    # get_playlists_v2 may already hold a globally cached auth instance created
    # with the old relative path; drop it so the redirect applies.
    try:
        import get_playlists_v2 as gp
        if getattr(gp, '_auth_instance', None) is not None:
            gp._auth_instance = None
    except Exception:
        pass

    # Point the "Reset auth" button at the real file.
    def _linux_reset_player_auth(self):
        try:
            if os.path.exists(local_auth):
                os.remove(local_auth)
            signage_main.Logger.info(f'SettingsPopup: Deleted auth file: {local_auth}')
            self._show_temp_message(
                '✓ Authentication reset - will reauthenticate on restart',
                (0, 1, 0, 1),
            )
        except Exception as exc:
            signage_main.Logger.error(f'SettingsPopup: Failed to reset auth: {exc}')

    signage_main.SettingsPopup.reset_player_auth = _bind_name(
        _linux_reset_player_auth, 'reset_player_auth'
    )
    return True


def _patch_startup_hooks(signage_main):
    """Apply orientation and stop the idle blanker once the app is up."""
    original_on_start = signage_main.SignagePlayerApp.on_start

    def _linux_on_start(self):
        original_on_start(self)
        try:
            from linux_display import (
                apply_orientation, keep_display_awake, neutralise_idle_blanker,
                status,
            )

            _early_log(f'display backend: {json.dumps(status())}')
            # The desktop ships an idle blanker that powers the panel off after
            # 10 minutes; a signage player must win that contest.
            neutralise_idle_blanker()
            keep_display_awake(force=True)

            root = getattr(self, 'root', None)
            orientation = ''
            if root is not None:
                orientation = (getattr(root, 'config', {}) or {}).get('orientation', '')
            if orientation:
                apply_orientation(orientation)
        except Exception as exc:
            _early_log(f'startup display hook failed (non-fatal): {exc}')

    signage_main.SignagePlayerApp.on_start = _bind_name(_linux_on_start, 'on_start')


# =====================================================================
# 5. Run
# =====================================================================
def main():
    from kivy.logger import Logger

    Logger.info('=' * 78)
    Logger.info('Kiwy Signage Player — Raspberry Pi / Linux Edition')
    Logger.info(f'Python:   {sys.version.split()[0]}')
    Logger.info(f'Platform: {platform.platform()}')
    Logger.info(f'Machine:  {platform.machine()}')
    Logger.info(f'Data dir: {DATA_DIR}')
    Logger.info(f'Session:  WAYLAND_DISPLAY={os.environ.get("WAYLAND_DISPLAY")} '
                f'DISPLAY={os.environ.get("DISPLAY")}')
    Logger.info('=' * 78)

    signage_main = _import_main()

    _reassert_graphics_config()
    patched = {
        'display': _patch_display(signage_main),
        'weblink': _patch_weblink_engines(signage_main),
        'temp': _patch_temp_paths(signage_main),
        'auth': _patch_auth_path(signage_main),
    }
    _patch_startup_hooks(signage_main)
    Logger.info(f'SignagePlayer: platform patches -> {patched}')

    try:
        signage_main.SignagePlayerApp().run()
    except KeyboardInterrupt:
        Logger.info('Application stopped by user (Ctrl+C)')
    except SystemExit as exc:
        _show_error(
            f'Kivy exited: {exc}',
            'Kivy could not create a window. Check the display backends.\n'
            f'SDL_VIDEODRIVER={os.environ.get("SDL_VIDEODRIVER")}\n'
            f'KIVY_GL_BACKEND={os.environ.get("KIVY_GL_BACKEND")}',
        )
        return 1
    except Exception as exc:
        Logger.critical(f'Fatal error: {exc}')
        Logger.exception('Full traceback:')
        _show_error(str(exc), traceback.format_exc())
        return 1
    finally:
        Logger.info('Application shutdown complete')
    return 0


if __name__ == '__main__':
    exit_code = 0
    try:
        exit_code = main()
    except SystemExit as exc:
        # A clean shutdown (SIGTERM from the watchdog, window closed after the
        # password exit) arrives here as SystemExit(0). Reporting that as a
        # fatal error wrote a bogus "FATAL: 0" crash log on every normal stop.
        code = exc.code
        exit_code = code if isinstance(code, int) else (0 if code is None else 1)
        if exit_code:
            _show_error(f'exited with code {exit_code}', traceback.format_exc())
    except BaseException as exc:  # includes import-time failures
        _show_error(str(exc), traceback.format_exc())
        raise
    sys.exit(exit_code)