"""
Info-Dialog für DocuMentor.

Zeigt Programmversion, Python-Version und alle Drittanbieter-Bibliotheken
mit installierten Versionen und Lizenzinformationen an.
"""
import logging
import sys
from importlib.metadata import PackageNotFoundError, version
from pathlib import Path

from PySide6.QtCore import Qt
from PySide6.QtGui import QFont
from PySide6.QtWidgets import (
    QDialog,
    QDialogButtonBox,
    QFrame,
    QHBoxLayout,
    QHeaderView,
    QLabel,
    QTableWidget,
    QTableWidgetItem,
    QVBoxLayout,
)

from license_parser import parse_license_file

logger = logging.getLogger(__name__)


class AboutDialog(QDialog):
    """Info-Dialog mit Versionsinformationen und Drittanbieter-Lizenzen."""

    def __init__(self, parent=None):
        super().__init__(parent)
        self.setWindowTitle("Über DocuMentor")
        self.resize(950, 620)
        self.setSizeGripEnabled(True)
        self.setModal(True)
        self._setup_ui()
        self._populate_data()

    def _get_app_version(self) -> str:
        """Ermittelt die Programmversion."""
        try:
            return version("DocuMentor")
        except PackageNotFoundError:
            # Fallback: pyproject.toml parsen (PyInstaller-Bundle oder Entwicklungsmodus)
            try:
                import tomllib

                if hasattr(sys, "_MEIPASS"):
                    pyproject = Path(sys._MEIPASS) / "pyproject.toml"  # type: ignore[attr-defined]
                else:
                    pyproject = Path(__file__).parent.parent.parent / "pyproject.toml"
                with open(pyproject, "rb") as f:
                    return tomllib.load(f)["project"]["version"]
            except Exception:
                return "unbekannt"

    def _setup_ui(self):
        """Erstellt das Dialog-Layout programmatisch."""
        layout = QVBoxLayout(self)
        layout.setSpacing(8)

        # App-Name
        self.app_name_label = QLabel("DocuMentor")
        font = QFont()
        font.setPointSize(18)
        font.setBold(True)
        self.app_name_label.setFont(font)
        self.app_name_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
        layout.addWidget(self.app_name_label)

        # Beschreibung
        self.description_label = QLabel("Professionelle XSL-Transformations-Verwaltung und PDF-Generierung")
        self.description_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
        self.description_label.setWordWrap(True)
        layout.addWidget(self.description_label)

        # Version + Python-Version
        self.version_label = QLabel()
        self.version_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
        layout.addWidget(self.version_label)

        # Lizenz
        self.license_label = QLabel("Lizenz: MIT")
        self.license_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
        layout.addWidget(self.license_label)

        # Separator
        separator = QFrame()
        separator.setFrameShape(QFrame.Shape.HLine)
        separator.setFrameShadow(QFrame.Shadow.Sunken)
        layout.addWidget(separator)

        # Überschrift für Tabelle
        header_layout = QHBoxLayout()
        table_header = QLabel("Drittanbieter-Bibliotheken:")
        header_font = QFont()
        header_font.setBold(True)
        table_header.setFont(header_font)
        header_layout.addWidget(table_header)
        header_layout.addStretch()
        layout.addLayout(header_layout)

        # Dependency-Tabelle
        self.table = QTableWidget()
        self.table.setColumnCount(6)
        self.table.setHorizontalHeaderLabels(["Name", "Lizenz", "Installiert", "Webseite", "Copyright", "Kategorie"])
        self.table.setEditTriggers(QTableWidget.EditTrigger.NoEditTriggers)
        self.table.setSelectionBehavior(QTableWidget.SelectionBehavior.SelectRows)
        self.table.setAlternatingRowColors(True)
        self.table.setSortingEnabled(True)
        self.table.verticalHeader().setVisible(False)

        # Spaltenbreiten
        header = self.table.horizontalHeader()
        header.resizeSection(0, 170)  # Name
        header.resizeSection(1, 180)  # Lizenz
        header.resizeSection(2, 80)   # Installiert
        header.resizeSection(5, 200)  # Kategorie
        header.setSectionResizeMode(3, QHeaderView.ResizeMode.Stretch)  # Webseite
        header.setSectionResizeMode(4, QHeaderView.ResizeMode.Stretch)  # Copyright

        layout.addWidget(self.table)

        # Schließen-Button
        button_box = QDialogButtonBox(QDialogButtonBox.StandardButton.Close)
        button_box.rejected.connect(self.reject)
        button_box.setCenterButtons(True)
        layout.addWidget(button_box)

    def _populate_data(self):
        """Befüllt den Dialog mit Versions- und Lizenzinformationen."""
        # Version setzen
        app_version = self._get_app_version()
        python_version = f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}"
        self.version_label.setText(f"Version: {app_version}  |  Python: {python_version}")

        # Lizenzdaten laden und Tabelle befüllen
        parsed = parse_license_file()
        self.table.setRowCount(len(parsed.entries))

        for row, entry in enumerate(parsed.entries):
            self.table.setItem(row, 0, QTableWidgetItem(entry.name))
            self.table.setItem(row, 1, QTableWidgetItem(entry.license))
            self.table.setItem(row, 2, QTableWidgetItem(entry.installed_version or "—"))
            if entry.website:
                website_label = QLabel(f'<a href="{entry.website}">{entry.website}</a>')
                website_label.setOpenExternalLinks(True)
                website_label.setTextInteractionFlags(Qt.TextInteractionFlag.TextBrowserInteraction)
                self.table.setCellWidget(row, 3, website_label)
            else:
                self.table.setItem(row, 3, QTableWidgetItem(""))
            self.table.setItem(row, 4, QTableWidgetItem(entry.copyright))
            self.table.setItem(row, 5, QTableWidgetItem(entry.category))