from PySide6.QtWidgets import (QTreeView, QFileDialog, QMenu, QInputDialog,
                               QMessageBox)
from PySide6.QtCore import Qt, QModelIndex, Signal
from PySide6.QtGui import QStandardItemModel, QStandardItem
from database import get_session
from models import Folder
import os
from preferences import Preferences

class FolderTreeView(QTreeView):
    folder_selected = Signal(int)  # Signal for folder selection

    def __init__(self, parent=None):
        super().__init__(parent)
        self.model = QStandardItemModel()
        self.model.setHorizontalHeaderLabels(['Pastas'])
        self.setModel(self.model)
        self.setContextMenuPolicy(Qt.CustomContextMenu)
        self.customContextMenuRequested.connect(self.show_context_menu)
        self.preferences = Preferences()
        self.load_folders()
        
        # Connect selection changed signal
        self.selectionModel().selectionChanged.connect(self.on_folder_selected)

    def load_folders(self):
        self.model.clear()
        self.model.setHorizontalHeaderLabels(['Pastas'])
        session = get_session()
        
        root_folders = session.query(Folder).filter(Folder.parent_id == None).all()
        
        for folder in root_folders:
            item = QStandardItem(folder.name)
            item.setData(folder.id)
            self.model.appendRow(item)
            self.load_subfolders(folder, item)
        
        session.close()

    def load_subfolders(self, folder, parent_item):
        session = get_session()
        subfolders = session.query(Folder).filter(Folder.parent_id == folder.id).all()
        
        for subfolder in subfolders:
            item = QStandardItem(subfolder.name)
            item.setData(subfolder.id)
            parent_item.appendRow(item)
            self.load_subfolders(subfolder, item)
        
        session.close()

    def get_physical_path(self, folder):
        """Get the physical path for a folder"""
        base_path = self.preferences.get_save_path()
        if not base_path:
            QMessageBox.warning(self, "Erro", "Por favor, configure o diretório de salvamento nas preferências primeiro.")
            return None
            
        path_parts = []
        current = folder
        while current:
            path_parts.insert(0, current.name)
            current = current.parent
        
        # Make sure we're using forward slashes and the correct base path
        # Only add 'Root' if it's not already in the path
        if path_parts and path_parts[0] != "Root":
            path_parts.insert(0, "Root")
        full_path = os.path.join(base_path, *path_parts)
        # Convert to forward slashes for consistency
        return full_path.replace("\\", "/")

    def create_physical_folder(self, folder):
        """Create the physical folder on disk"""
        physical_path = self.get_physical_path(folder)
        if physical_path and not os.path.exists(physical_path):
            try:
                os.makedirs(physical_path)
                return True
            except Exception as e:
                QMessageBox.warning(self, "Erro", f"Erro ao criar pasta física: {str(e)}")
                return False
        return True

    def show_context_menu(self, position):
        menu = QMenu()
        add_action = menu.addAction("Nova Pasta")
        delete_action = menu.addAction("Excluir Pasta")
        rename_action = menu.addAction("Renomear")
        
        action = menu.exec_(self.mapToGlobal(position))
        
        if action == add_action:
            self.add_folder()
        elif action == delete_action:
            self.delete_folder()
        elif action == rename_action:
            self.rename_folder()

    def on_folder_selected(self, selected, deselected):
        indexes = selected.indexes()
        if indexes:
            current_item = self.model.itemFromIndex(indexes[0])
            folder_id = current_item.data()
            self.folder_selected.emit(folder_id)

    def add_folder(self):
        name, ok = QInputDialog.getText(self, "Nova Pasta", "Nome da pasta:")
        if ok and name:
            session = get_session()
            current_index = self.currentIndex()
            
            new_folder = Folder(name=name)
            if current_index.isValid():
                parent_id = self.model.itemFromIndex(current_index).data()
                parent_folder = session.query(Folder).get(parent_id)
                new_folder.parent_id = parent_id
                new_folder.parent = parent_folder
            
            session.add(new_folder)
            session.commit()
            
            # Create physical folder
            if not self.create_physical_folder(new_folder):
                session.delete(new_folder)
                session.commit()
            
            session.close()
            self.load_folders()

    def delete_folder(self):
        current_index = self.currentIndex()
        if not current_index.isValid():
            return

        reply = QMessageBox.question(self, "Confirmar Exclusão",
                                   "Tem certeza que deseja excluir esta pasta?\nIsso também excluirá a pasta física do disco.",
                                   QMessageBox.Yes | QMessageBox.No)
        
        if reply == QMessageBox.Yes:
            session = get_session()
            folder_id = self.model.itemFromIndex(current_index).data()
            folder = session.query(Folder).get(folder_id)
            if folder:
                # Delete physical folder
                physical_path = self.get_physical_path(folder)
                if physical_path and os.path.exists(physical_path):
                    try:
                        os.rmdir(physical_path)  # Only removes if empty
                    except Exception as e:
                        QMessageBox.warning(self, "Aviso", f"Não foi possível excluir a pasta física: {str(e)}")
                
                session.delete(folder)
                session.commit()
            session.close()
            self.load_folders()

    def rename_folder(self):
        current_index = self.currentIndex()
        if not current_index.isValid():
            return

        current_name = self.model.itemFromIndex(current_index).text()
        name, ok = QInputDialog.getText(self, "Renomear Pasta",
                                      "Novo nome:", text=current_name)
        
        if ok and name:
            session = get_session()
            folder_id = self.model.itemFromIndex(current_index).data()
            folder = session.query(Folder).get(folder_id)
            if folder:
                folder.name = name
                session.commit()
            session.close()
            self.load_folders()