/****************************************************************************
 Copyright (c) 2012 - Zynga Inc.
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2023 Xiamen Yaji Software Co., Ltd.

 http://www.cocos.com

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights to
 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 of the Software, and to permit persons to whom the Software is furnished to do so,
 subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 THE SOFTWARE.
****************************************************************************/

/*
 Local Storage support for the JS Bindings for iOS.
 Works on cocos2d-iphone and cocos2d-x.
 */

#include "storage/local-storage/LocalStorage.h"
#include <cstdio>
#include <cstdlib>

#if (CC_PLATFORM == CC_PLATFORM_WINDOWS)
    #include <sqlite3/sqlite3.h>
#else
    #include <sqlite3.h>
#endif

#include "base/Macros.h"
#include "base/Log.h"

static int _initialized = 0;
static sqlite3 *_db;
static sqlite3_stmt *_stmt_select;
static sqlite3_stmt *_stmt_remove;
static sqlite3_stmt *_stmt_update;
static sqlite3_stmt *_stmt_clear;
static sqlite3_stmt *_stmt_key;
static sqlite3_stmt *_stmt_count;

static void localStorageCreateTable() {
    const char *sql_createtable = "CREATE TABLE IF NOT EXISTS data(key TEXT PRIMARY KEY,value TEXT);";
    sqlite3_stmt *stmt;
    int ok = sqlite3_prepare_v2(_db, sql_createtable, -1, &stmt, nullptr);
    ok |= sqlite3_step(stmt);
    ok |= sqlite3_finalize(stmt);

    if (ok != SQLITE_OK && ok != SQLITE_DONE)
        printf("Error in CREATE TABLE\n");
}

void localStorageInit(const ccstd::string &fullpath /* = "" */) {
    if (!_initialized) {
        int ret = 0;

        if (fullpath.empty())
            ret = sqlite3_open(":memory:", &_db);
        else
            ret = sqlite3_open(fullpath.c_str(), &_db);

        localStorageCreateTable();

        // SELECT
        const char *sql_select = "SELECT value FROM data WHERE key=?;";
        ret |= sqlite3_prepare_v2(_db, sql_select, -1, &_stmt_select, nullptr);

        // REPLACE
        const char *sql_update = "REPLACE INTO data (key, value) VALUES (?,?);";
        ret |= sqlite3_prepare_v2(_db, sql_update, -1, &_stmt_update, nullptr);

        // DELETE
        const char *sql_remove = "DELETE FROM data WHERE key=?;";
        ret |= sqlite3_prepare_v2(_db, sql_remove, -1, &_stmt_remove, nullptr);

        // Clear
        const char *sql_clear = "DELETE FROM data;";
        ret |= sqlite3_prepare_v2(_db, sql_clear, -1, &_stmt_clear, nullptr);

        // key
        const char *sql_key = "SELECT key FROM data ORDER BY ROWID ASC;";
        ret |= sqlite3_prepare_v2(_db, sql_key, -1, &_stmt_key, nullptr);

        //count
        const char *sql_count = "SELECT COUNT(*) FROM data;";
        ret |= sqlite3_prepare_v2(_db, sql_count, -1, &_stmt_count, nullptr);

        if (ret != SQLITE_OK) {
            printf("Error initializing DB(%s)\n", fullpath.c_str());
            // report error
        }
        _initialized = 1;
    }
}

void localStorageFree() {
    if (_initialized) {
        sqlite3_finalize(_stmt_select);
        sqlite3_finalize(_stmt_remove);
        sqlite3_finalize(_stmt_update);
        sqlite3_finalize(_stmt_clear);
        sqlite3_finalize(_stmt_key);
        sqlite3_finalize(_stmt_count);

        int ret = sqlite3_close(_db);
        CC_ASSERT(ret == SQLITE_OK);
        if (ret != SQLITE_OK) {
            CC_LOG_ERROR("sqlite3_close failed, ret: %d", ret);
        }

        _initialized = 0;
    }
}

/** sets an item in the LS */
void localStorageSetItem(const ccstd::string &key, const ccstd::string &value) {
    CC_ASSERT(_initialized);
    int ok = sqlite3_bind_text(_stmt_update, 1, key.c_str(), -1, SQLITE_TRANSIENT);
    ok |= sqlite3_bind_text(_stmt_update, 2, value.c_str(), -1, SQLITE_TRANSIENT);

    ok |= sqlite3_step(_stmt_update);

    ok |= sqlite3_reset(_stmt_update);

    if (ok != SQLITE_OK && ok != SQLITE_DONE)
        printf("Error in localStorage.setItem()\n");
}

/** gets an item from the LS */
bool localStorageGetItem(const ccstd::string &key, ccstd::string *outItem) {
    CC_ASSERT(_initialized);
    int ok = sqlite3_reset(_stmt_select);

    ok |= sqlite3_bind_text(_stmt_select, 1, key.c_str(), -1, SQLITE_TRANSIENT);
    ok |= sqlite3_step(_stmt_select);
    const unsigned char *text = sqlite3_column_text(_stmt_select, 0);

    if (ok != SQLITE_OK && ok != SQLITE_DONE && ok != SQLITE_ROW) {
        printf("Error in localStorage.getItem()\n");
        return false;
    } else if (!text) {
        return false;
    } else {
        outItem->assign((const char *)text);
        return true;
    }
}

/** removes an item from the LS */
void localStorageRemoveItem(const ccstd::string &key) {
    CC_ASSERT(_initialized);
    int ok = sqlite3_bind_text(_stmt_remove, 1, key.c_str(), -1, SQLITE_TRANSIENT);

    ok |= sqlite3_step(_stmt_remove);

    ok |= sqlite3_reset(_stmt_remove);

    if (ok != SQLITE_OK && ok != SQLITE_DONE)
        printf("Error in localStorage.removeItem()\n");
}

/** removes all items from the LS */
void localStorageClear() {
    CC_ASSERT(_initialized);
    int ok = sqlite3_step(_stmt_clear);

    ok |= sqlite3_reset(_stmt_clear);

    if (ok != SQLITE_OK && ok != SQLITE_DONE)
        printf("Error in localStorage.clear()\n");
}

/** gets an key from the JS. */
void localStorageGetKey(const int nIndex, ccstd::string *outKey) {
    CC_ASSERT(_initialized);
    if (nIndex < 0) {
        printf("Error in input localStorage index Less than zero\n");
        return;
    }
    int ok = sqlite3_reset(_stmt_key);

    ok |= sqlite3_step(_stmt_key);

    int nCount = 0;
    const unsigned char *text = nullptr;
    while (ok == SQLITE_ROW) {
        if (nCount == nIndex) {
            text = sqlite3_column_text(_stmt_key, 0);
            break;
        }

        ok |= sqlite3_step(_stmt_key);
        nCount++;
    }

    if (ok != SQLITE_OK && ok != SQLITE_DONE && ok != SQLITE_ROW) {
        printf("Error in localStorage.key(n)\n");
    } else if (!text) {
        return;
    } else {
        outKey->assign((const char *)text);
    }
}

/** gets all items count in the JS. */
void localStorageGetLength(int &outLength) {
    CC_ASSERT(_initialized);
    int ok = sqlite3_reset(_stmt_count);

    ok |= sqlite3_step(_stmt_count);

    if (ok != SQLITE_OK && ok != SQLITE_DONE && ok != SQLITE_ROW) {
        printf("Error in localStorage.length\n");
        outLength = 0;
    } else {
        outLength = sqlite3_column_int(_stmt_count, 0);
    }
}