package org.simantics.fileimport.ui;

import java.nio.file.Paths;
import java.util.Map;
import java.util.Optional;

import javax.inject.Named;

import org.eclipse.e4.core.di.annotations.CanExecute;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;
import org.simantics.fileimport.FileImportService;

public class ImportFileHandler {

    @CanExecute
    public boolean canExecute() {
        return !FileImportService.supportedExtensionsWithFilters().isEmpty();
    }

    @Execute
    public void execute(@Named(IServiceConstants.ACTIVE_SHELL) Shell shell) {

        Map<String, String> extensions = FileImportService.supportedExtensionsWithFilters();
        String[] filterExtensions = (String[]) extensions.keySet().toArray(new String[extensions.keySet().size()]);
        String[] filterNames = (String[]) extensions.values().toArray(new String[extensions.values().size()]);
        
        // Sanity check
        for (int i = 0; i < filterExtensions.length; i++) {
            String extension = filterExtensions[i];
            if (!extension.startsWith("*.")) {
                System.err.println("Invalid extension filter provied: " + extension);
            }
        }

        FileDialog dialog = new FileDialog(shell, SWT.OPEN);
        dialog.setText("Choose File");
        dialog.setFilterExtensions(filterExtensions);
        dialog.setFilterNames(filterNames);
        final String fileName = dialog.open();
        if (fileName == null)
            return;
        FileImportService.performFileImport(Paths.get(fileName), Optional.empty());
    }
}