from __future__ import annotations

from app.qt_compat import QHBoxLayout, QInputDialog, QListWidget, QListWidgetItem, QMessageBox, QPushButton, Qt, QVBoxLayout, QWidget
from app.ui.section_panel import SectionPanel


class PresetBrowser(QWidget):
    def __init__(self, controller, parent: QWidget | None = None) -> None:
        super().__init__(parent)
        self.controller = controller

        layout = QVBoxLayout(self)
        layout.setContentsMargins(0, 0, 0, 0)

        group = SectionPanel("Presets")
        group_layout = QVBoxLayout(group.body)
        group_layout.setContentsMargins(12, 12, 12, 12)
        group_layout.setSpacing(8)

        self.list_widget = QListWidget()
        self.list_widget.itemDoubleClicked.connect(self._load_selected)
        group_layout.addWidget(self.list_widget, 1)

        button_row = QHBoxLayout()
        self.save_button = QPushButton("Save Current")
        self.load_button = QPushButton("Load")
        self.delete_button = QPushButton("Delete")
        button_row.addWidget(self.save_button)
        button_row.addWidget(self.load_button)
        button_row.addWidget(self.delete_button)
        group_layout.addLayout(button_row)

        layout.addWidget(group)

        self.save_button.clicked.connect(self._save_current)
        self.load_button.clicked.connect(self._load_selected)
        self.delete_button.clicked.connect(self._delete_selected)
        self.controller.presets_changed.connect(self.refresh)
        self.refresh()

    def refresh(self) -> None:
        self.list_widget.clear()
        for preset in self.controller.available_presets():
            item = QListWidgetItem(preset.name)
            item.setToolTip(f"{preset.pattern_id}\nPalette: {preset.palette}")
            self.list_widget.addItem(item)

    def _selected_name(self) -> str | None:
        item = self.list_widget.currentItem()
        return item.text() if item else None

    def _save_current(self) -> None:
        name, ok = QInputDialog.getText(self, "Save Preset", "Preset name:")
        if ok and name.strip():
            self.controller.save_current_preset(name.strip())
            self.refresh()

    def _load_selected(self, *_args) -> None:
        name = self._selected_name()
        if name:
            self.controller.apply_preset(name)

    def _delete_selected(self) -> None:
        name = self._selected_name()
        if not name:
            return
        confirm = QMessageBox.question(
            self,
            "Delete Preset",
            f"Delete preset '{name}'?",
            QMessageBox.Yes | QMessageBox.No,
        )
        if confirm == QMessageBox.Yes:
            self.controller.delete_preset(name)
            self.refresh()