from __future__ import annotations

import os
import shutil
import signal
import subprocess
import time
from pathlib import Path
from typing import TextIO

import pytest


_PROJECT_ROOT: Path = Path(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
_SCRIPTS_DIR: Path = _PROJECT_ROOT / "tests" / "artifacts" / "tier2_state" / "default_layout_install_20260629"
_GUI_SCRIPT: str = str(_PROJECT_ROOT / "sloppy.py")
_INI_FILENAME: str = "manualslop_layout.ini"


def _spawn_sloppy_for(workspace: Path, log_suffix: str) -> subprocess.Popen:
 _SCRIPTS_DIR.mkdir(parents=True, exist_ok=True)
 log_path: Path = _SCRIPTS_DIR / f"test_{log_suffix}.log"
 log_file: TextIO = open(log_path, "w", encoding="utf-8", errors="replace")
 env: dict[str, str] = os.environ.copy()
 env["PYTHONPATH"] = str(_PROJECT_ROOT.absolute())
 args: list[str] = ["uv", "run", "python", "-u", _GUI_SCRIPT]
 creation: int = subprocess.CREATE_NEW_PROCESS_GROUP if os.name == "nt" else 0
 proc: subprocess.Popen = subprocess.Popen(
  args,
  stdout=log_file,
  stderr=log_file,
  text=True,
  cwd=str(workspace.absolute()),
  env=env,
  creationflags=creation,
 )
 log_file.close()
 return proc


def _terminate(process: subprocess.Popen) -> None:
 if process.poll() is not None:
  return
 pid: int | None = process.pid
 if pid is None:
  return
 try:
  if os.name == "nt":
   subprocess.run(
    ["taskkill", "/F", "/T", "/PID", str(pid)],
    stdout=subprocess.DEVNULL,
    stderr=subprocess.DEVNULL,
    check=False,
   )
  else:
   os.killpg(os.getpgid(pid), signal.SIGKILL)
 except Exception:
  pass
 try:
  process.wait(timeout=2)
 except Exception:
  pass


def _read_ini(workspace: Path) -> str:
 ini_path: Path = workspace / _INI_FILENAME
 if not ini_path.exists():
  return ""
 try:
  return ini_path.read_text(encoding="utf-8", errors="replace")
 except OSError:
  return ""


def _has_dockid_after_window_header(text: str) -> bool:
 lines: list[str] = text.splitlines()
 for idx, line in enumerate(lines):
  if line.startswith("[Window][") and line.rstrip().endswith("]"):
   tail: str = "\n".join(lines[idx + 1:])
   if "DockId=" in tail:
    return True
 return False


def _workspace_for(tmp_path: Path, test_name: str) -> Path:
 return tmp_path / f"_default_layout_install_{os.getpid()}_{test_name}"


def _start_subprocess_in(workspace: Path, log_suffix: str) -> subprocess.Popen:
 proc: subprocess.Popen = _spawn_sloppy_for(workspace, log_suffix)
 time.sleep(5.0)
 return proc


def _assert_installed_default(workspace: Path) -> None:
 ini_path: Path = workspace / _INI_FILENAME
 assert ini_path.exists(), f"expected {ini_path} to exist after launch"
 text: str = _read_ini(workspace)
 assert "[Window][Project Settings]" in text, (
  f"installed INI missing [Window][Project Settings]; got first 400 chars: {text[:400]!r}"
 )
 assert _has_dockid_after_window_header(text), (
  f"installed INI has no DockId= following a [Window][...] header; got first 400 chars: {text[:400]!r}"
 )


def test_default_layout_installed_when_ini_missing(tmp_path: Path) -> None:
 workspace: Path = _workspace_for(tmp_path, "ini_missing")
 workspace.mkdir(parents=True, exist_ok=True)
 ini_path: Path = workspace / _INI_FILENAME
 if ini_path.exists():
  ini_path.unlink()
 proc: subprocess.Popen = _start_subprocess_in(workspace, "ini_missing")
 try:
  _assert_installed_default(workspace)
 finally:
  _terminate(proc)
  shutil.rmtree(workspace, ignore_errors=True)


def test_default_layout_installed_when_ini_empty(tmp_path: Path) -> None:
 workspace: Path = _workspace_for(tmp_path, "ini_empty")
 workspace.mkdir(parents=True, exist_ok=True)
 ini_path: Path = workspace / _INI_FILENAME
 ini_path.write_bytes(b"\n\n\n\n\n")
 proc: subprocess.Popen = _start_subprocess_in(workspace, "ini_empty")
 try:
  _assert_installed_default(workspace)
 finally:
  _terminate(proc)
  shutil.rmtree(workspace, ignore_errors=True)


def test_default_layout_NOT_installed_when_layout_present(tmp_path: Path) -> None:
 workspace: Path = _workspace_for(tmp_path, "ini_custom")
 workspace.mkdir(parents=True, exist_ok=True)
 ini_path: Path = workspace / _INI_FILENAME
 custom_lines: list[str] = ["[Window][CustomPanelPersistent]", "Pos=10,10", "DockId=0xDEAD", ""]
 for i in range(32):
  custom_lines.append(f"; padding line {i}")
  custom_lines.append("[Window][Filler]")
  custom_lines.append(f"Pos={i},{i}")
  custom_lines.append("Size=100,100")
 content: str = "\n".join(custom_lines) + "\n"
 ini_path.write_text(content, encoding="utf-8")
 assert ini_path.stat().st_size >= 1000, "custom INI must be at least 1000 bytes for this test"
 proc: subprocess.Popen = _start_subprocess_in(workspace, "ini_custom")
 try:
  text: str = _read_ini(workspace)
  assert "[Window][CustomPanelPersistent]" in text, (
   f"custom INI should be preserved (no overwrite), but content changed: {text[:400]!r}"
  )
  assert "DockId=0xDEAD" in text, "custom DockId entry should survive install"
 finally:
  _terminate(proc)
  shutil.rmtree(workspace, ignore_errors=True)