Source code for cosedaUI.about_window

"""About dialog for COSEDA."""

from importlib import resources
from pathlib import Path

from PyQt6.QtWidgets import QDialog, QLabel, QTextEdit, QPushButton, QVBoxLayout, QHBoxLayout, QGroupBox, QWidget
from PyQt6.QtCore import Qt


def _load_license_text():
    """Return the bundled license text, falling back to the source checkout."""
    resource_error = None
    try:
        license_resource = resources.files("cosedaUI").joinpath("resources", "LICENSE")
        if license_resource.is_file():
            return license_resource.read_text(encoding="utf-8")
    except Exception as exc:
        resource_error = exc

    for license_path in (
        Path(__file__).resolve().parent / "resources" / "LICENSE",
        Path(__file__).resolve().parents[2] / "LICENSE",
    ):
        try:
            if license_path.is_file():
                return license_path.read_text(encoding="utf-8")
        except OSError:
            continue

    if resource_error is not None:
        return f"Error loading LICENSE file: {resource_error}"
    return "Error loading LICENSE file: bundled license resource was not found."




class AboutWindow(QDialog):
    """Modal dialog that shows product name, authors, license text, and changelog."""

    def __init__(self, window_title, changelog, parent=None):
        """Create the dialog and build its UI."""
        super().__init__(parent)
        self.window_title = window_title
        self.changelog = changelog
        self.init_ui()



    def init_ui(self):
        """Assemble the dialog layout and populate static text and license contents."""
        # Set dialog title
        self.setWindowTitle("About COSEDA")
        # Use a vertical layout
        main_layout = QVBoxLayout(self)

        # Header with project title
        title_label = QLabel(
            "COSEDA - Continuous Serial Electron Diffraction Data Analysis", self
        )
        title_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
        main_layout.addWidget(title_label)

        # Contributors list under header
        contrib_label = QLabel(
            "Paul Hager, Gerhard Hofer, Lei Wang, Laura Pacoste, "
            "Buster Blomberg, Angelina Vypritskaia, Alexis Fonjallaz", self
        )
        contrib_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
        main_layout.addWidget(contrib_label)

        # Affiliation
        aff_label = QLabel("Stockholm University 2026", self)
        aff_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
        main_layout.addWidget(aff_label)

        # Copyright notice
        copy_label = QLabel("© 2026 Paul Hager", self)
        copy_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
        main_layout.addWidget(copy_label)

        # License box
        license_box = QGroupBox("License", self)
        box_layout = QVBoxLayout(license_box)
        license_edit = QTextEdit(self)
        license_edit.setReadOnly(True)
        license_edit.setPlainText(_load_license_text())
        box_layout.addWidget(license_edit)
        main_layout.addWidget(license_box)

        # Close button at bottom
        close_btn = QPushButton("Close", self)
        close_btn.clicked.connect(self.close)
        # Center the button
        btn_container = QWidget(self)
        btn_layout = QHBoxLayout(btn_container)
        btn_layout.addStretch()
        btn_layout.addWidget(close_btn)
        btn_layout.addStretch()
        main_layout.addWidget(btn_container)

        # Adjust size to fit
        self.adjustSize()






def open_about_window(window_title, changelog, theme, parent=None):
    """Instantiate and display the modal About dialog."""
    about_window = AboutWindow(window_title, changelog, parent)
    about_window.exec()  # Executes the dialog modally