/*
 * Copyright 2016 Hippo Seven
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hippo.ehviewer;

import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Environment;

import androidx.annotation.Nullable;

import com.hippo.ehviewer.client.exception.ParseException;
import com.hippo.util.ReadableTime;
import com.hippo.yorozuya.FileUtils;
import com.hippo.yorozuya.IOUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;

public class AppConfig {

    public static final String APP_DIRNAME = "EhViewer";

    private static final String DOWNLOAD = "download";
    private static final String TEMP = "temp";
    private static final String PARSE_ERROR = "parse_error";
    private static final String CRASH = "crash";

    @SuppressLint("StaticFieldLeak")
    private static Context sContext;

    public static void initialize(Context context) {
        sContext = context.getApplicationContext();
    }

    @Nullable
    public static File getExternalAppDir() {
        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
            File dir = sContext.getExternalFilesDir(null);
            return FileUtils.ensureDirectory(dir) ? dir : null;
        }
        return null;
    }

    /**
     * mkdirs and get
     */
    @Nullable
    public static File getDirInExternalAppDir(String filename) {
        File appFolder = getExternalAppDir();
        if (appFolder != null) {
            File dir = new File(appFolder, filename);
            return FileUtils.ensureDirectory(dir) ? dir : null;
        }
        return null;
    }

    @Nullable
    public static File getFileInExternalAppDir(String filename) {
        File appFolder = getExternalAppDir();
        if (appFolder != null) {
            File file = new File(appFolder, filename);
            return FileUtils.ensureFile(file) ? file : null;
        }
        return null;
    }

    @Nullable
    public static File getDefaultDownloadDir() {
        return getDirInExternalAppDir(DOWNLOAD);
    }

    @Nullable
    public static File getExternalTempDir() {
        File dir = sContext.getExternalCacheDir();
        File file;
        if (null != dir && FileUtils.ensureDirectory(file = new File(dir, TEMP))) {
            return file;
        } else {
            return null;
        }
    }

    @Nullable
    public static File getExternalCopyTempDir() {
        File dir = sContext.getExternalCacheDir();
        File file;
        if (null != dir && FileUtils.ensureDirectory(file = new File(dir, "copy"))) {
            return file;
        } else {
            return null;
        }
    }

    @Nullable
    public static File getExternalParseErrorDir() {
        return getDirInExternalAppDir(PARSE_ERROR);
    }

    @Nullable
    public static File getExternalCrashDir() {
        return getDirInExternalAppDir(CRASH);
    }

    @Nullable
    public static File getTempDir() {
        File dir = sContext.getCacheDir();
        File file;
        if (null != dir && FileUtils.ensureDirectory(file = new File(dir, TEMP))) {
            return file;
        } else {
            return null;
        }
    }

    @Nullable
    public static File createTempFile() {
        return FileUtils.createTempFile(getTempDir(), null);
    }

    public static void saveParseErrorBody(ParseException e) {
        File dir = getExternalParseErrorDir();
        if (null == dir) {
            return;
        }

        File file = new File(dir, ReadableTime.getFilenamableTime(System.currentTimeMillis()) + ".txt");
        OutputStream os = null;
        try {
            os = new FileOutputStream(file);
            String message = e.getMessage();
            String body = e.getBody();
            if (null != message) {
                os.write(message.getBytes(StandardCharsets.UTF_8));
                os.write('\n');
            }
            if (null != body) {
                os.write(body.getBytes(StandardCharsets.UTF_8));
            }
            os.flush();
        } catch (IOException e1) {
            // Ignore
        } finally {
            IOUtils.closeQuietly(os);
        }
    }

    @Nullable
    public static File getFilesDir(String name) {
        File dir = sContext.getFilesDir();
        if (dir == null) {
            return null;
        }

        dir = new File(dir, name);
        if (dir.isDirectory() || dir.mkdirs()) {
            return dir;
        } else {
            return null;
        }
    }
}