package org.julianfamily.keepassgo;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.net.Uri;
import android.os.ParcelFileDescriptor;
import android.provider.OpenableColumns;

import java.io.File;
import java.io.FileNotFoundException;

public final class SharedVaultProvider extends ContentProvider {
    private static final String AUTHORITY = "org.julianfamily.keepassgo.share";

    @Override
    public boolean onCreate() {
        return true;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        File file = resolveSharedFile(uri);
        String[] columns = projection;
        if (columns == null || columns.length == 0) {
            columns = new String[]{OpenableColumns.DISPLAY_NAME, OpenableColumns.SIZE};
        }
        MatrixCursor cursor = new MatrixCursor(columns, 1);
        Object[] row = new Object[columns.length];
        for (int i = 0; i < columns.length; i++) {
            switch (columns[i]) {
                case OpenableColumns.DISPLAY_NAME:
                    row[i] = file.getName();
                    break;
                case OpenableColumns.SIZE:
                    row[i] = file.length();
                    break;
                default:
                    row[i] = null;
                    break;
            }
        }
        cursor.addRow(row);
        return cursor;
    }

    @Override
    public String getType(Uri uri) {
        return "application/x-keepass2";
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        throw new UnsupportedOperationException("insert is not supported");
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        throw new UnsupportedOperationException("delete is not supported");
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        throw new UnsupportedOperationException("update is not supported");
    }

    @Override
    public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
        File file = resolveSharedFile(uri);
        return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
    }

    static Uri uriForFile(String name) {
        return new Uri.Builder()
                .scheme("content")
                .authority(AUTHORITY)
                .appendPath(name)
                .build();
    }

    private File resolveSharedFile(Uri uri) {
        if (getContext() == null) {
            throw new IllegalStateException("provider context is unavailable");
        }
        String name = sanitizeFilename(uri.getLastPathSegment());
        return new File(AndroidShare.sharedDirectory(getContext()), name);
    }

    private static String sanitizeFilename(String name) {
        if (name == null) {
            return "shared-vault.kdbx";
        }
        String trimmed = name.trim();
        if (trimmed.isEmpty()) {
            return "shared-vault.kdbx";
        }
        return new File(trimmed).getName();
    }
}