"""
Entry point for the MRI Sequence Interpreter GUI.

Run from the repo root:
    python -m seq_interp.gui_app
or:
    python seq_interp/gui_app.py

Optionally pass a .seq file as the first CLI argument to pre-load it:
    python seq_interp/gui_app.py data/input/test1_full.seq
"""
from __future__ import annotations

import os
import sys

# Ensure the repo root (parent of seq_interp/) is importable regardless of
# how the script is invoked.
_here = os.path.dirname(os.path.abspath(__file__))
_repo_root = os.path.dirname(_here)
if _repo_root not in sys.path:
    sys.path.insert(0, _repo_root)

import argparse

from PySide6.QtWidgets import QApplication

from seq_interp.src.gui.main_window import MainWindow


def main() -> None:
    parser = argparse.ArgumentParser(
        description="MRI Sequence Interpreter — interactive GUI"
    )
    parser.add_argument(
        "seq_file", nargs="?", default=None,
        help="Optional .seq file to load on startup",
    )
    parser.add_argument(
        "--hw-config", default=None,
        help="Optional hardware config JSON to load on startup",
    )
    parser.add_argument(
        "--output-dir", default=None,
        help="Optional output directory",
    )
    args = parser.parse_args()

    app = QApplication(sys.argv)
    app.setApplicationName("MRI Sequence Interpreter")
    app.setOrganizationName("LF-MRI")
    # Qt6 / PySide6: high-DPI is enabled automatically — AA_UseHighDpiPixmaps
    # is deprecated and emits a DeprecationWarning; omit it.

    win = MainWindow()

    # Centre window on primary screen (MainWindow.__init__ sizes it already,
    # but doesn't centre)
    screen = app.primaryScreen()
    if screen is not None:
        ag = screen.availableGeometry()
        win.move(
            ag.x() + (ag.width()  - win.width())  // 2,
            ag.y() + (ag.height() - win.height()) // 2,
        )

    # Pre-load files from CLI arguments if given
    if args.hw_config and os.path.isfile(args.hw_config):
        win._hw_config_path = os.path.abspath(args.hw_config)
        win._log(f"HW config pre-loaded: {win._hw_config_path}")

    if args.output_dir:
        win._output_dir = os.path.abspath(args.output_dir)
        win._log(f"Output dir: {win._output_dir}")

    if args.seq_file and os.path.isfile(args.seq_file):
        win._seq_path = os.path.abspath(args.seq_file)
        name = os.path.basename(win._seq_path)
        win._set_seq_state("selected", name)
        win._btn_run.setEnabled(True)
        win._log(f"Sequence pre-loaded: {win._seq_path}")

    win.show()
    sys.exit(app.exec())


if __name__ == "__main__":
    main()