# C:\PYTHON\MyICR_Suite\app\features\navigation\navigation_panel.py

import logging
from PyQt6.QtWidgets import QWidget, QVBoxLayout, QTreeWidget, QTreeWidgetItem, QTreeWidgetItemIterator
from PyQt6.QtCore import pyqtSignal, Qt

logger = logging.getLogger(__name__)

class NavigationPanel(QWidget):
    """Pannello di navigazione laterale con una struttura ad albero (QTreeView)."""
    
    section_selected = pyqtSignal(str)

    def __init__(self, theme=None):
        super().__init__()
        self.theme = theme or {}
        
        self.main_layout = QVBoxLayout(self)
        self.main_layout.setContentsMargins(0, 0, 0, 0)
        self.main_layout.setSpacing(0)
        
        self.tree_widget = QTreeWidget()
        self.tree_widget.setHeaderHidden(True)
        self.tree_widget.itemClicked.connect(self._on_item_clicked)
        
        self.tree_widget.setStyleSheet(self._get_tree_style())
        
        self.main_layout.addWidget(self.tree_widget)
        
    def populate_tree(self, structure: dict):
        self.tree_widget.clear()
        self._add_items(None, structure)
        self.tree_widget.expandAll()

    def _add_items(self, parent_item, children):
        for name, details in children.items():
            current_item = QTreeWidgetItem(parent_item or self.tree_widget)
            current_item.setText(0, name)
            
            if 'id' in details:
                current_item.setData(0, Qt.ItemDataRole.UserRole, details['id'])
            else:
                current_item.setFlags(current_item.flags() & ~Qt.ItemFlag.ItemIsSelectable)
                
            if 'children' in details:
                self._add_items(current_item, details['children'])

    def set_active_section(self, section_id: str):
        iterator = QTreeWidgetItemIterator(self.tree_widget)
        while iterator.value():
            item = iterator.value()
            item_id = item.data(0, Qt.ItemDataRole.UserRole)
            if item_id == section_id:
                self.tree_widget.setCurrentItem(item)
                break
            iterator += 1

    def _on_item_clicked(self, item, column):
        section_id = item.data(0, Qt.ItemDataRole.UserRole)
        
        if section_id:
            logger.debug(f"Item di navigazione cliccato: {section_id}")
            self.section_selected.emit(section_id)

    def _get_tree_style(self) -> str:
        return """
            QTreeView {
                border: none;
                background-color: transparent;
                font-size: 14px;
            }
            QTreeView::item {
                padding: 10px;
            }
            QTreeView::item:hover {
                background-color: #E1E1E1;
            }
            QTreeView::item:selected {
                background-color: #DEECF9;
                color: #005A9E;
                font-weight: 600;
            }
        """