/*
   Android Bookmark Database

   Copyright 2013 Thincast Technologies GmbH, Author: Martin Fleisz

   This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. 
   If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/

package com.freerdp.freerdpcore.services;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.provider.BaseColumns;
import android.util.Log;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class BookmarkDB extends SQLiteOpenHelper {
    public static final String ID = BaseColumns._ID;
    private static final int DB_VERSION = 8;
    private static final String DB_BACKUP_PREFIX = "temp_";
    private static final String DB_NAME = "bookmarks.db";
    static final String DB_TABLE_BOOKMARK = "tbl_manual_bookmarks";
    static final String DB_TABLE_SCREEN = "tbl_screen_settings";
    static final String DB_TABLE_PERFORMANCE = "tbl_performance_flags";
    private static final String[] DB_TABLES = {
            DB_TABLE_BOOKMARK,
            DB_TABLE_SCREEN,
            DB_TABLE_PERFORMANCE
    };

    static final String DB_KEY_SCREEN_COLORS = "colors";
    static final String DB_KEY_SCREEN_RESOLUTION = "resolution";
    static final String DB_KEY_SCREEN_WIDTH = "width";
    static final String DB_KEY_SCREEN_HEIGHT = "height";

    static final String DB_KEY_SCREEN_SETTINGS = "screen_settings";
    static final String DB_KEY_SCREEN_SETTINGS_3G = "screen_3g";
    static final String DB_KEY_PERFORMANCE_FLAGS = "performance_flags";
    static final String DB_KEY_PERFORMANCE_FLAGS_3G = "performance_3g";

    static final String DB_KEY_PERFORMANCE_RFX = "perf_remotefx";
    static final String DB_KEY_PERFORMANCE_GFX = "perf_gfx";
    static final String DB_KEY_PERFORMANCE_H264 = "perf_gfx_h264";
    static final String DB_KEY_PERFORMANCE_WALLPAPER = "perf_wallpaper";
    static final String DB_KEY_PERFORMANCE_THEME = "perf_theming";
    static final String DB_KEY_PERFORMANCE_DRAG = "perf_full_window_drag";
    static final String DB_KEY_PERFORMANCE_MENU_ANIMATIONS = "perf_menu_animations";
    static final String DB_KEY_PERFORMANCE_FONTS = "perf_font_smoothing";
    static final String DB_KEY_PERFORMANCE_COMPOSITION = "perf_desktop_composition";

    static final String DB_KEY_BOOKMARK_LABEL = "label";
    static final String DB_KEY_BOOKMARK_HOSTNAME = "hostname";
    static final String DB_KEY_BOOKMARK_USERNAME = "username";
    static final String DB_KEY_BOOKMARK_PASSWORD = "password";
    static final String DB_KEY_BOOKMARK_DOMAIN = "domain";
    static final String DB_KEY_BOOKMARK_PORT = "port";

    static final String DB_KEY_BOOKMARK_REDIRECT_SDCARD = "redirect_sdcard";
    static final String DB_KEY_BOOKMARK_REDIRECT_SOUND = "redirect_sound";
    static final String DB_KEY_BOOKMARK_REDIRECT_MICROPHONE = "redirect_microphone";
    static final String DB_KEY_BOOKMARK_SECURITY = "security";
    static final String DB_KEY_BOOKMARK_REMOTE_PROGRAM = "remote_program";
    static final String DB_KEY_BOOKMARK_WORK_DIR = "work_dir";
    static final String DB_KEY_BOOKMARK_ASYNC_CHANNEL = "async_channel";
    static final String DB_KEY_BOOKMARK_ASYNC_TRANSPORT = "async_transport";
    static final String DB_KEY_BOOKMARK_ASYNC_INPUT = "async_input";
    static final String DB_KEY_BOOKMARK_ASYNC_UPDATE = "async_update";
    static final String DB_KEY_BOOKMARK_CONSOLE_MODE = "console_mode";
    static final String DB_KEY_BOOKMARK_DEBUG_LEVEL = "debug_level";

    static final String DB_KEY_BOOKMARK_GW_ENABLE = "enable_gateway_settings";
    static final String DB_KEY_BOOKMARK_GW_HOSTNAME = "gateway_hostname";
    static final String DB_KEY_BOOKMARK_GW_PORT = "gateway_port";
    static final String DB_KEY_BOOKMARK_GW_USERNAME = "gateway_username";
    static final String DB_KEY_BOOKMARK_GW_PASSWORD = "gateway_password";
    static final String DB_KEY_BOOKMARK_GW_DOMAIN = "gateway_domain";
    static final String DB_KEY_BOOKMARK_3G_ENABLE = "enable_3g_settings";

    public BookmarkDB(Context context) {
        super(context, DB_NAME, null, DB_VERSION);
    }

    private static List<String> GetColumns(SQLiteDatabase db, String tableName) {
        List<String> ar = null;
        Cursor c = null;
        try {
            c = db.rawQuery("SELECT * FROM " + tableName + " LIMIT 1", null);
            if (c != null) {
                ar = new ArrayList<>(Arrays.asList(c.getColumnNames()));
            }
        } catch (Exception e) {
            Log.v(tableName, e.getMessage(), e);
            e.printStackTrace();
        } finally {
            if (c != null)
                c.close();
        }
        return ar;
    }

    private static String joinStrings(List<String> list, String delim) {
        StringBuilder buf = new StringBuilder();
        int num = list.size();
        for (int i = 0; i < num; i++) {
            if (i != 0)
                buf.append(delim);
            buf.append((String) list.get(i));
        }
        return buf.toString();
    }

    private void backupTables(SQLiteDatabase db) {
        for (String table : DB_TABLES) {
            final String tmpTable = DB_BACKUP_PREFIX + table;
            final String query = "ALTER TABLE '" + table + "' RENAME TO '" + tmpTable + "'";
            try {
                db.execSQL(query);
            } catch (Exception e) {
                /* Ignore errors if table does not exist. */
            }
        }
    }

    private void dropOldTables(SQLiteDatabase db) {
        for (String table : DB_TABLES) {
            final String tmpTable = DB_BACKUP_PREFIX + table;
            final String query = "DROP TABLE IF EXISTS '" + tmpTable + "'";
            db.execSQL(query);
        }
    }

    private void createDB(SQLiteDatabase db) {
        final String sqlScreenSettings =
                "CREATE TABLE IF NOT EXISTS " + DB_TABLE_SCREEN + " ("
                        + ID + " INTEGER PRIMARY KEY, "
                        + DB_KEY_SCREEN_COLORS + " INTEGER DEFAULT 16, "
                        + DB_KEY_SCREEN_RESOLUTION + " INTEGER DEFAULT 0, "
                        + DB_KEY_SCREEN_WIDTH + ", "
                        + DB_KEY_SCREEN_HEIGHT + ");";

        db.execSQL(sqlScreenSettings);

        final String sqlPerformanceFlags =
                "CREATE TABLE IF NOT EXISTS " + DB_TABLE_PERFORMANCE + " ("
                        + ID + " INTEGER PRIMARY KEY, "
                        + DB_KEY_PERFORMANCE_RFX + " INTEGER, "
                        + DB_KEY_PERFORMANCE_GFX + " INTEGER, "
                        + DB_KEY_PERFORMANCE_H264 + " INTEGER, "
                        + DB_KEY_PERFORMANCE_WALLPAPER + " INTEGER, "
                        + DB_KEY_PERFORMANCE_THEME + " INTEGER, "
                        + DB_KEY_PERFORMANCE_DRAG + " INTEGER, "
                        + DB_KEY_PERFORMANCE_MENU_ANIMATIONS + " INTEGER, "
                        + DB_KEY_PERFORMANCE_FONTS + " INTEGER, "
                        + DB_KEY_PERFORMANCE_COMPOSITION + " INTEGER);";

        db.execSQL(sqlPerformanceFlags);

        final String sqlManualBookmarks = getManualBookmarksCreationString();
        db.execSQL(sqlManualBookmarks);
    }

    private void upgradeTables(SQLiteDatabase db) {
        for (String table : DB_TABLES) {
            final String tmpTable = DB_BACKUP_PREFIX + table;

            final List<String> newColumns = GetColumns(db, table);
            List<String> columns = GetColumns(db, tmpTable);

            if (columns != null) {
                columns.retainAll(newColumns);

                // restore data
                final String cols = joinStrings(columns, ",");
                final String query = String.format("INSERT INTO %s (%s) SELECT %s from '%s'", table, cols, cols, tmpTable);
                db.execSQL(query);
            }
        }
    }

    private void downgradeTables(SQLiteDatabase db) {
        for (String table : DB_TABLES) {
            final String tmpTable = DB_BACKUP_PREFIX + table;

            List<String> oldColumns = GetColumns(db, table);
            final List<String> columns = GetColumns(db, tmpTable);

            if (oldColumns != null) {
                oldColumns.retainAll(columns);

                // restore data
                final String cols = joinStrings(oldColumns, ",");
                final String query = String.format("INSERT INTO %s (%s) SELECT %s from '%s'", table, cols, cols, tmpTable);
                db.execSQL(query);
            }
        }
    }

    private List<String> getTableNames(SQLiteDatabase db) {
        final String query = "SELECT name FROM sqlite_master WHERE type='table'";
        Cursor cursor = db.rawQuery(query, null);
        List<String> list = new ArrayList<>();
        try {
            if (cursor.moveToFirst() && (cursor.getCount() > 0)) {
                while (!cursor.isAfterLast()) {
                    final String name = cursor.getString(cursor.getColumnIndex("name"));
                    list.add(name);
                    cursor.moveToNext();
                }
            }
        } finally {
            cursor.close();
        }

        return list;
    }

    private void insertDefault(SQLiteDatabase db) {
        ContentValues screenValues = new ContentValues();
        screenValues.put(DB_KEY_SCREEN_COLORS, 32);
        screenValues.put(DB_KEY_SCREEN_RESOLUTION, 1);
        screenValues.put(DB_KEY_SCREEN_WIDTH, 1024);
        screenValues.put(DB_KEY_SCREEN_HEIGHT, 768);

        final long idScreen = db.insert(DB_TABLE_SCREEN, null, screenValues);
        final long idScreen3g = db.insert(DB_TABLE_SCREEN, null, screenValues);

        ContentValues performanceValues = new ContentValues();
        performanceValues.put(DB_KEY_PERFORMANCE_RFX, 1);
        performanceValues.put(DB_KEY_PERFORMANCE_GFX, 1);
        performanceValues.put(DB_KEY_PERFORMANCE_H264, 0);
        performanceValues.put(DB_KEY_PERFORMANCE_WALLPAPER, 0);
        performanceValues.put(DB_KEY_PERFORMANCE_THEME, 0);
        performanceValues.put(DB_KEY_PERFORMANCE_DRAG, 0);
        performanceValues.put(DB_KEY_PERFORMANCE_MENU_ANIMATIONS, 0);
        performanceValues.put(DB_KEY_PERFORMANCE_FONTS, 0);
        performanceValues.put(DB_KEY_PERFORMANCE_COMPOSITION, 0);

        final long idPerformance = db.insert(DB_TABLE_PERFORMANCE, null, performanceValues);
        final long idPerformance3g = db.insert(DB_TABLE_PERFORMANCE, null, performanceValues);

        ContentValues bookmarkValues = new ContentValues();
        bookmarkValues.put(DB_KEY_BOOKMARK_LABEL, "Test Server");
        bookmarkValues.put(DB_KEY_BOOKMARK_HOSTNAME, "testservice.afreerdp.com");
        bookmarkValues.put(DB_KEY_BOOKMARK_USERNAME, "");
        bookmarkValues.put(DB_KEY_BOOKMARK_PASSWORD, "");
        bookmarkValues.put(DB_KEY_BOOKMARK_DOMAIN, "");
        bookmarkValues.put(DB_KEY_BOOKMARK_PORT, "3389");

        bookmarkValues.put(DB_KEY_SCREEN_SETTINGS, idScreen);
        bookmarkValues.put(DB_KEY_SCREEN_SETTINGS_3G, idScreen3g);
        bookmarkValues.put(DB_KEY_PERFORMANCE_FLAGS, idPerformance);
        bookmarkValues.put(DB_KEY_PERFORMANCE_FLAGS_3G, idPerformance3g);

        bookmarkValues.put(DB_KEY_BOOKMARK_REDIRECT_SDCARD, 0);
        bookmarkValues.put(DB_KEY_BOOKMARK_REDIRECT_SOUND, 0);
        bookmarkValues.put(DB_KEY_BOOKMARK_REDIRECT_MICROPHONE, 0);
        bookmarkValues.put(DB_KEY_BOOKMARK_SECURITY, 0);
        bookmarkValues.put(DB_KEY_BOOKMARK_REMOTE_PROGRAM, "");
        bookmarkValues.put(DB_KEY_BOOKMARK_WORK_DIR, "");
        bookmarkValues.put(DB_KEY_BOOKMARK_ASYNC_CHANNEL, 1);
        bookmarkValues.put(DB_KEY_BOOKMARK_ASYNC_TRANSPORT, 0);
        bookmarkValues.put(DB_KEY_BOOKMARK_ASYNC_INPUT, 1);
        bookmarkValues.put(DB_KEY_BOOKMARK_ASYNC_UPDATE, 1);
        bookmarkValues.put(DB_KEY_BOOKMARK_CONSOLE_MODE, 0);
        bookmarkValues.put(DB_KEY_BOOKMARK_DEBUG_LEVEL, "INFO");

        db.insert(DB_TABLE_BOOKMARK, null, bookmarkValues);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        createDB(db);
        insertDefault(db);
    }

    private String getManualBookmarksCreationString() {
        return (
                "CREATE TABLE IF NOT EXISTS " + DB_TABLE_BOOKMARK + " ("
                        + ID + " INTEGER PRIMARY KEY, "
                        + DB_KEY_BOOKMARK_LABEL + " TEXT NOT NULL, "
                        + DB_KEY_BOOKMARK_HOSTNAME + " TEXT NOT NULL, "
                        + DB_KEY_BOOKMARK_USERNAME + " TEXT NOT NULL, "
                        + DB_KEY_BOOKMARK_PASSWORD + " TEXT, "
                        + DB_KEY_BOOKMARK_DOMAIN + " TEXT, "
                        + DB_KEY_BOOKMARK_PORT + " TEXT, "
                        + DB_KEY_SCREEN_SETTINGS + " INTEGER NOT NULL, "
                        + DB_KEY_PERFORMANCE_FLAGS + " INTEGER NOT NULL, "

                        + DB_KEY_BOOKMARK_GW_ENABLE + " INTEGER DEFAULT 0, "
                        + DB_KEY_BOOKMARK_GW_HOSTNAME + " TEXT, "
                        + DB_KEY_BOOKMARK_GW_PORT + " INTEGER DEFAULT 443, "
                        + DB_KEY_BOOKMARK_GW_USERNAME + " TEXT, "
                        + DB_KEY_BOOKMARK_GW_PASSWORD + " TEXT, "
                        + DB_KEY_BOOKMARK_GW_DOMAIN + " TEXT, "

                        + DB_KEY_BOOKMARK_3G_ENABLE + " INTEGER DEFAULT 0, "
                        + DB_KEY_SCREEN_SETTINGS_3G + " INTEGER NOT NULL, "
                        + DB_KEY_PERFORMANCE_FLAGS_3G + " INTEGER NOT NULL, "
                        + DB_KEY_BOOKMARK_REDIRECT_SDCARD + " INTEGER DEFAULT 0, "
                        + DB_KEY_BOOKMARK_REDIRECT_SOUND + " INTEGER DEFAULT 0, "
                        + DB_KEY_BOOKMARK_REDIRECT_MICROPHONE + " INTEGER DEFAULT 0, "
                        + DB_KEY_BOOKMARK_SECURITY + " INTEGER, "
                        + DB_KEY_BOOKMARK_REMOTE_PROGRAM + " TEXT, "
                        + DB_KEY_BOOKMARK_WORK_DIR + " TEXT, "
                        + DB_KEY_BOOKMARK_ASYNC_CHANNEL + " INTEGER DEFAULT 0, "
                        + DB_KEY_BOOKMARK_ASYNC_TRANSPORT + " INTEGER DEFAULT 0, "
                        + DB_KEY_BOOKMARK_ASYNC_INPUT + " INTEGER DEFAULT 0, "
                        + DB_KEY_BOOKMARK_ASYNC_UPDATE + " INTEGER DEFAULT 0, "
                        + DB_KEY_BOOKMARK_CONSOLE_MODE + " INTEGER, "
                        + DB_KEY_BOOKMARK_DEBUG_LEVEL + " TEXT DEFAULT 'INFO', "

                        + "FOREIGN KEY(" + DB_KEY_SCREEN_SETTINGS + ") REFERENCES " + DB_TABLE_SCREEN + "(" + ID + "), "
                        + "FOREIGN KEY(" + DB_KEY_PERFORMANCE_FLAGS + ") REFERENCES " + DB_TABLE_PERFORMANCE + "(" + ID + "), "
                        + "FOREIGN KEY(" + DB_KEY_SCREEN_SETTINGS_3G + ") REFERENCES " + DB_TABLE_SCREEN + "(" + ID + "), "
                        + "FOREIGN KEY(" + DB_KEY_PERFORMANCE_FLAGS_3G + ") REFERENCES " + DB_TABLE_PERFORMANCE + "(" + ID + ") "

                        + ");");
    }

    private void recreateDB(SQLiteDatabase db) {
        for (String table : DB_TABLES) {
            final String query = "DROP TABLE IF EXISTS '" + table + "'";
            db.execSQL(query);
        }
        onCreate(db);
    }

    private void upgradeDB(SQLiteDatabase db) {
        db.beginTransaction();
        try {
            /* Back up old tables. */
            dropOldTables(db);
            backupTables(db);
            createDB(db);
            upgradeTables(db);

            db.setTransactionSuccessful();
        } finally {
            db.endTransaction();
            dropOldTables(db);
        }
    }

    private void downgradeDB(SQLiteDatabase db) {
        db.beginTransaction();
        try {
            /* Back up old tables. */
            dropOldTables(db);
            backupTables(db);
            createDB(db);
            downgradeTables(db);

            db.setTransactionSuccessful();
        } finally {
            db.endTransaction();
            dropOldTables(db);
        }
    }

    // from http://stackoverflow.com/questions/3424156/upgrade-sqlite-database-from-one-version-to-another
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        switch (oldVersion) {
            case 0:
            case 1:
            case 2:
            case 3:
            case 4:
            case 5:
            case 6:
            case 7:
            case 8:
                upgradeDB(db);
                break;
            default:
                recreateDB(db);
                break;
        }
    }

    @Override
    public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        downgradeDB(db);
    }

}
