"""
library_manager.py — Dialog til at se og fjerne musikbiblioteker.
"""

from PyQt6.QtWidgets import (
    QDialog, QVBoxLayout, QHBoxLayout, QLabel,
    QPushButton, QListWidget, QListWidgetItem, QMessageBox,
)
from PyQt6.QtCore import Qt, pyqtSignal


class LibraryManagerDialog(QDialog):
    library_removed = pyqtSignal(int)   # library_id

    def __init__(self, parent=None):
        super().__init__(parent)
        self.setWindowTitle("Administrer musikbiblioteker")
        self.setMinimumWidth(500)
        self.setMinimumHeight(320)
        self._build_ui()
        self._load()

    def _build_ui(self):
        layout = QVBoxLayout(self)
        layout.setContentsMargins(16, 16, 16, 16)
        layout.setSpacing(10)

        lbl = QLabel("Aktive musikbiblioteker:")
        lbl.setObjectName("track_meta")
        layout.addWidget(lbl)

        self._list = QListWidget()
        layout.addWidget(self._list)

        note = QLabel(
            "Når du fjerner et bibliotek, slettes det fra overvågningen.\n"
            "Sangene forbliver i databasen men markeres som manglende (⚠)."
        )
        note.setObjectName("result_count")
        note.setWordWrap(True)
        layout.addWidget(note)

        btn_row = QHBoxLayout()
        btn_add = QPushButton("+ Tilføj mappe")
        btn_add.clicked.connect(self._add_folder)
        btn_row.addWidget(btn_add)

        btn_remove = QPushButton("✕  Fjern valgt")
        btn_remove.clicked.connect(self._remove_selected)
        btn_row.addWidget(btn_remove)

        btn_scan = QPushButton("⟳  Scan alle")
        btn_scan.setToolTip("Scan alle mapper for nye og ændrede filer")
        btn_scan.clicked.connect(self._scan_all)
        btn_row.addWidget(btn_scan)

        btn_row.addStretch()
        btn_close = QPushButton("Luk")
        btn_close.clicked.connect(self.accept)
        btn_row.addWidget(btn_close)
        layout.addLayout(btn_row)

    def _load(self):
        self._list.clear()
        try:
            from local.local_db import get_libraries, get_db
            libs = get_libraries(active_only=True)   # kun aktive
            for lib in libs:
                from pathlib import Path
                path = lib["path"]
                exists = Path(path).exists()
                last_scan = lib["last_full_scan"] or "aldrig"
                if isinstance(last_scan, str) and len(last_scan) > 10:
                    last_scan = last_scan[:10]
                with get_db() as conn:
                    count = conn.execute(
                        "SELECT COUNT(*) FROM songs WHERE library_id=? AND file_missing=0",
                        (lib["id"],)
                    ).fetchone()[0]
                exist_icon = "" if exists else "  ⚠ mappe ikke fundet"
                label = f"{path}{exist_icon}\n  {count} sange  ·  senest scannet: {last_scan}"
                item = QListWidgetItem(label)
                item.setData(Qt.ItemDataRole.UserRole, dict(lib))
                if not exists:
                    from PyQt6.QtGui import QColor
                    item.setForeground(QColor("#5a6070"))
                self._list.addItem(item)
        except Exception as e:
            print(f"Library manager load fejl: {e}")

    def _scan_all(self):
        mw = self.parent()
        if hasattr(mw, "start_scan"):
            mw.start_scan()
            self._set_status("Scanning startet...")

    def _set_status(self, text: str):
        pass  # kan udvides med statuslinje i dialogen

    def _add_folder(self):
        from PyQt6.QtWidgets import QFileDialog
        folder = QFileDialog.getExistingDirectory(self, "Vælg musikmappe")
        if folder:
            mw = self.parent()
            if hasattr(mw, "add_library_path"):
                mw.add_library_path(folder)
            # Genindlæs listen efter kort pause så DB er opdateret
            from PyQt6.QtCore import QTimer
            QTimer.singleShot(600, self._load)

    def _remove_selected(self):
        item = self._list.currentItem()
        if not item:
            return
        lib = item.data(Qt.ItemDataRole.UserRole)
        reply = QMessageBox.question(
            self, "Fjern bibliotek",
            f"Fjern overvågningen af:\n{lib['path']}\n\n"
            "Sange i biblioteket forbliver i databasen men markeres som manglende.",
            QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No,
        )
        if reply == QMessageBox.StandardButton.Yes:
            try:
                mw = self.parent()
                if hasattr(mw, "_watcher") and mw._watcher:
                    mw._watcher.remove_library(lib["id"])
                else:
                    from local.local_db import remove_library
                    remove_library(lib["id"])
                self.library_removed.emit(lib["id"])
                if hasattr(mw, "_reload_library"):
                    mw._reload_library()
                self._load()
            except Exception as e:
                QMessageBox.warning(self, "Fejl", f"Kunne ikke fjerne: {e}")