"""
MonitorWidget: mpv-based live stream monitor embedded in GTK4.

Uses libmpv's OpenGL render API + Gtk.GLArea for proper embedding.
No X11 wid hacks — renders directly to a GL texture in the GTK layout.
Works on both X11 and Wayland.
"""

import logging

import gi
gi.require_version("Gtk", "4.0")
from gi.repository import Gtk, GLib, Gdk

from cht.ui.mpv import Player

log = logging.getLogger(__name__)


class MonitorWidget(Gtk.Box):
    """Widget that embeds mpv video via OpenGL into the GTK4 layout."""

    def __init__(self, **kwargs):
        super().__init__(orientation=Gtk.Orientation.VERTICAL, **kwargs)
        self._player = None

        self._gl_area = Gtk.GLArea()
        self._gl_area.set_hexpand(True)
        self._gl_area.set_vexpand(True)
        self._gl_area.set_auto_render(False)
        self._gl_area.set_has_depth_buffer(False)
        self._gl_area.set_has_stencil_buffer(False)

        self._gl_area.connect("realize", self._on_realize)
        self._gl_area.connect("unrealize", self._on_unrealize)
        self._gl_area.connect("render", self._on_render)

        self.append(self._gl_area)
        log.info("MonitorWidget initialized (GLArea)")

    def _on_realize(self, gl_area):
        """GL context is ready — initialize mpv's render context."""
        log.info("GLArea realized")
        gl_area.make_current()
        if gl_area.get_error():
            log.error("GLArea error: %s", gl_area.get_error())
            return

    def _on_unrealize(self, gl_area):
        """Clean up mpv render context."""
        log.info("GLArea unrealized")
        if self._player:
            self._player.terminate()
            self._player = None

    def _on_render(self, gl_area, gl_context):
        """Render mpv's current frame to the GLArea."""
        if not self._player:
            return True

        # Get the default FBO that GTK4 GLArea renders to
        fbo = gl_area.get_buffer() if hasattr(gl_area, 'get_buffer') else 0
        width = gl_area.get_width()
        height = gl_area.get_height()

        # GTK4 GLArea uses its own FBO, get it from GL state
        import ctypes
        fbo_id = ctypes.c_int(0)
        gl = ctypes.cdll.LoadLibrary("libGL.so.1")
        gl.glGetIntegerv(0x8CA6, ctypes.byref(fbo_id))  # GL_DRAW_FRAMEBUFFER_BINDING

        self._player.render(fbo_id.value, width, height)
        return True

    def _on_mpv_update(self):
        """Called by mpv when a new frame is ready. Triggers re-render."""
        GLib.idle_add(self._gl_area.queue_render)

    def start_stream(self, source, record_path=None):
        """Start playing from a URL and optionally record to disk.

        Args:
            source: TCP URL (tcp://...), file path, etc.
            record_path: if set, mpv dumps the raw stream to this file
        """
        self._gl_area.make_current()

        self._player = Player(record_path=record_path)
        self._player.init_gl(update_callback=self._on_mpv_update)
        self._player.play(source)
        log.info("Monitor streaming from: %s (record=%s)", source, record_path)

    def stop(self):
        """Stop playback and release mpv."""
        if self._player:
            log.info("Stopping monitor")
            self._player.terminate()
            self._player = None
        else:
            log.info("Monitor already stopped")