#!/usr/bin/env python3
import os
import re
import threading
import time
import pyray as rl
from openpilot.system.hardware import HARDWARE, PC
from openpilot.system.ui.lib.button import gui_button, ButtonStyle
from openpilot.system.ui.lib.scroll_panel import GuiScrollPanel
from openpilot.system.ui.lib.application import gui_app

MARGIN = 8
SPACING = 12
FONT_SIZE = 64
LINE_HEIGHT = 72
BUTTON_SIZE = rl.Vector2(290, 160)

DEMO_TEXT = """selfdrive/ui/ui.cc:23:12: error: unused variable 'scene' [-Werror,-Wunused-variable]
   23 |   UIScene &scene = s->scene;
      |            ^~~~~
selfdrive/ui/ui.cc:39:3: error: expected unqualified-id
   39 |   if (sm.updated("pandaStates")) {
      |   ^
selfdrive/ui/ui.cc:51:5: error: expected unqualified-id
   51 |   } else if ((s->sm->frame - s->sm->rcv_frame("pandaStates")) > 5*UI_FREQ) {
      |     ^
selfdrive/ui/ui.cc:54:3: error: expected unqualified-id
   54 |   if (sm.updated("wideRoadCameraState")) {
      |   ^
selfdrive/ui/ui.cc:58:5: error: expected unqualified-id
   58 |   } else if (!sm.allAliveAndValid({"wideRoadCameraState"})) {
      |     ^
selfdrive/ui/ui.cc:61:3: error: unknown type name 'scene'
   61 |   scene.started = sm["deviceState"].getDeviceState().getStarted() && scene.ignition;
      |   ^
selfdrive/ui/ui.cc:61:8: error: cannot use dot operator on a type
   61 |   scene.started = sm["deviceState"].getDeviceState().getStarted() && scene.ignition;
      |        ^
selfdrive/ui/ui.cc:62:1: error: extraneous closing brace ('}')
   62 | }
      | ^
8 errors generated.
scons: *** [selfdrive/ui/ui.o] Error 1"""

def wrap_text(text, font_size, max_width):
  lines = []
  font = gui_app.font()

  for paragraph in text.split("\n"):
    if not paragraph.strip():
      # Don't add empty lines first, ensuring wrap_text("") returns []
      if lines:
        lines.append("")
      continue
    indent = re.match(r"^\s*", paragraph).group()
    current_line = indent
    words = re.split("(\s+)", paragraph[len(indent):])
    while len(words):
      word = words.pop(0)
      test_line = current_line + word + (words.pop(0) if words else "")
      if rl.measure_text_ex(font, test_line, font_size, 0).x <= max_width:
        current_line = test_line
      else:
        lines.append(current_line)
        current_line = word + " "
    current_line = current_line.rstrip()
    if current_line:
      lines.append(current_line)

  return lines


class TextWindowRenderer:
  def __init__(self, text: str):
    self._textarea_rect = rl.Rectangle(MARGIN, 0, gui_app.width - MARGIN, gui_app.height)
    self._wrapped_lines = wrap_text(text, FONT_SIZE, self._textarea_rect.width - 20)
    self._content_rect = rl.Rectangle(0, 0, self._textarea_rect.width - 20, len(self._wrapped_lines) * LINE_HEIGHT)
    self._scroll_panel = GuiScrollPanel(show_vertical_scroll_bar=True)
    self._scroll_panel._offset.y = -max(self._content_rect.height - self._textarea_rect.height, 0)

  def render(self):
    scroll = self._scroll_panel.handle_scroll(self._textarea_rect, self._content_rect)
    rl.begin_scissor_mode(int(self._textarea_rect.x), int(self._textarea_rect.y), int(self._textarea_rect.width), int(self._textarea_rect.height))
    for i, line in enumerate(self._wrapped_lines):
      position = rl.Vector2(self._textarea_rect.x + scroll.x, self._textarea_rect.y + scroll.y + i * LINE_HEIGHT)
      if position.y + LINE_HEIGHT < self._textarea_rect.y or position.y > self._textarea_rect.y + self._textarea_rect.height:
        continue
      rl.draw_text_ex(gui_app.font(100), line, position, FONT_SIZE, 0, rl.WHITE)
    rl.end_scissor_mode()

    button_bounds = rl.Rectangle(gui_app.width - MARGIN - BUTTON_SIZE.x - SPACING, gui_app.height - MARGIN - BUTTON_SIZE.y, BUTTON_SIZE.x, BUTTON_SIZE.y)
    ret = gui_button(button_bounds, "Exit" if PC else "Reboot", button_style=ButtonStyle.TRANSPARENT)
    if ret:
      if PC:
        gui_app.request_close()
      else:
        HARDWARE.reboot()
    return ret


class TextWindow:
  def __init__(self, text: str):
    self._text = text

    self._renderer: TextWindowRenderer | None = None
    self._stop_event = threading.Event()
    self._thread = threading.Thread(target=self._run)
    self._thread.start()

    # wait for the renderer to be initialized
    while self._renderer is None and self._thread.is_alive():
      time.sleep(0.01)

  def wait_for_exit(self):
    while self._thread.is_alive():
      time.sleep(0.01)

  def _run(self):
    if os.getenv("CI") is not None:
      return
    gui_app.init_window("Text")
    self._renderer = renderer = TextWindowRenderer(self._text)
    try:
      for _ in gui_app.render():
        if self._stop_event.is_set():
          break
        renderer.render()
    finally:
      gui_app.close()

  def __enter__(self):
    return self

  def close(self):
    if self._thread.is_alive():
      self._stop_event.set()
      self._thread.join(timeout=2.0)
      if self._thread.is_alive():
        print("WARNING: failed to join text window thread")

  def __del__(self):
    self.close()

  def __exit__(self, exc_type, exc_val, exc_tb):
    self.close()


if __name__ == "__main__":
  with TextWindow(DEMO_TEXT):
    time.sleep(5)