package org.hedgewars.hedgeroid.Datastructures;

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Map;

import java.util.TreeMap;

import org.hedgewars.hedgeroid.Utils;

import org.hedgewars.hedgeroid.frontlib.Flib;

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

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 Map<String, Scheme> loadUserSchemes(Context c) throws IOException {

		return loadSchemes(c, getUserSchemesFile(c));

	}

	public static Map<String, Scheme> loadBuiltinSchemes(Context c) throws IOException {

		return loadSchemes(c, getBuiltinSchemesFile(c));

	}

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

		Map<String, Scheme> result = new TreeMap<String, Scheme>();

		String metaschemePath = new File(Utils.getDataPathFile(c), "metasettings.ini").getAbsolutePath();

		if(!schemeFile.isFile()) {

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

			return new TreeMap<String, Scheme>();

		}

		MetaschemePtr meta = null;

		SchemelistPtr schemeListPtr = null;

		try {

			meta = Flib.INSTANCE.flib_metascheme_from_ini(metaschemePath);

			if(meta==null) {

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

			}

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

			if(schemeListPtr == null) {

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

			}

			List<Scheme> schemeList = schemeListPtr.deref();

			for(Scheme scheme : schemeList) {

				result.put(scheme.name, scheme);

			}

			return result;

		} finally {

			if(schemeListPtr != null) {

				Flib.INSTANCE.flib_schemelist_destroy(schemeListPtr);

			}

			if(meta != null) {

				Flib.INSTANCE.flib_metascheme_release(meta);

			}

		}

	}

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

		List<Scheme> schemeList = new ArrayList<Scheme>(schemes.values());

		Collections.sort(schemeList, Scheme.caseInsensitiveNameComparator);

		SchemelistPtr ptr = SchemelistPtr.createJavaOwned(schemeList);

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

	}

}