package org.hedgewars.hedgeroid.Datastructures;

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import org.hedgewars.hedgeroid.frontlib.Flib;

import org.hedgewars.hedgeroid.frontlib.Frontlib.SchemelistPtr;

import android.content.Context;

/**

 * Functions for handling the persistent list of schemes.

 * Schemes in that list are identified by name (case sensitive).

 */

public final class Schemes {

	private Schemes() {

		throw new AssertionError("This class is not meant to be instantiated");

	}

	public static File getUserSchemesFile(Context c) {

		return new File(c.getFilesDir(), "schemes_user.ini");

	}

	public static File getBuiltinSchemesFile(Context c) {

		return new File(c.getFilesDir(), "schemes_builtin.ini");

	}

	public static List<Scheme> loadAllSchemes(Context c) throws IOException {

		List<Scheme> result = loadBuiltinSchemes(c);

		result.addAll(loadUserSchemes(c));

		return result;

	}

	public static List<Scheme> loadUserSchemes(Context c) throws IOException {

		return loadSchemes(c, getUserSchemesFile(c));

	}

	public static List<Scheme> loadBuiltinSchemes(Context c) throws IOException {

		return loadSchemes(c, getBuiltinSchemesFile(c));

	}

	public static List<Scheme> loadSchemes(Context c, File schemeFile) throws IOException {

		if(!schemeFile.isFile()) {

			// No schemes file == no schemes, no error

			return new ArrayList<Scheme>();

		}

		SchemelistPtr schemeListPtr = null;

		try {

			schemeListPtr = Flib.INSTANCE.flib_schemelist_from_ini(schemeFile.getAbsolutePath());

			if(schemeListPtr == null) {

				throw new IOException("Unable to read schemelist");

			}

			return schemeListPtr.deref();

		} finally {

			if(schemeListPtr != null) {

				Flib.INSTANCE.flib_schemelist_destroy(schemeListPtr);

			}

		}

	}

	public static void saveUserSchemes(Context c, List<Scheme> schemes) throws IOException {

		SchemelistPtr ptr = SchemelistPtr.createJavaOwned(schemes);

		Flib.INSTANCE.flib_schemelist_to_ini(getUserSchemesFile(c).getAbsolutePath(), ptr);

	}

	public static List<String> toNameList(List<Scheme> schemes) {

		List<String> result = new ArrayList<String>();

		for(Scheme scheme : schemes) {

			result.add(scheme.name);

		}

		return result;

	}

}