/*
 * Copyright (c) 2016 MariaDB Corporation Ab
 *
 * Use of this software is governed by the Business Source License included
 * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
 *
 * Change Date: 2019-07-01
 *
 * On the date above, in accordance with the Business Source License, use
 * of this software will be governed by version 2 or later of the General
 * Public License.
 */

#include <maxscale/cppdefs.hh>
#include <iostream>
#include <maxscale/modutil.h>
#include <maxscale/paths.h>
#include <maxscale/protocol/mysql.h>
#include "../core/maxscale/query_classifier.h"

using namespace std;

namespace
{

enum test_target_t
{
    TEST_PARSER = 0x1,
    TEST_QC     = 0x2,
    TEST_ALL    = (TEST_PARSER | TEST_QC)
};

GWBUF* create_gwbuf(const char* zStmt)
{
    size_t len = strlen(zStmt);
    size_t payload_len = len + 1;
    size_t gwbuf_len = MYSQL_HEADER_LEN + payload_len;

    GWBUF* pBuf = gwbuf_alloc(gwbuf_len);

    *((unsigned char*)((char*)GWBUF_DATA(pBuf))) = payload_len;
    *((unsigned char*)((char*)GWBUF_DATA(pBuf) + 1)) = (payload_len >> 8);
    *((unsigned char*)((char*)GWBUF_DATA(pBuf) + 2)) = (payload_len >> 16);
    *((unsigned char*)((char*)GWBUF_DATA(pBuf) + 3)) = 0x00;
    *((unsigned char*)((char*)GWBUF_DATA(pBuf) + 4)) = 0x03;
    memcpy((char*)GWBUF_DATA(pBuf) + 5, zStmt, len);

    return pBuf;
}

uint32_t get_qc_trx_type_mask(GWBUF* pBuf)
{
    return qc_get_trx_type_mask_using(pBuf, QC_TRX_PARSE_USING_QC);
}

uint32_t get_parser_trx_type_mask(GWBUF* pBuf)
{
    return qc_get_trx_type_mask_using(pBuf, QC_TRX_PARSE_USING_PARSER);
}

}

namespace
{

struct test_case
{
    const char* zStmt;
    uint32_t    type_mask;
} test_cases[] =
{
    { "BEGIN", QUERY_TYPE_BEGIN_TRX },
    { "BEGIN WORK", QUERY_TYPE_BEGIN_TRX },

    { "COMMIT", QUERY_TYPE_COMMIT },
    { "COMMIT WORK", QUERY_TYPE_COMMIT },

    { "ROLLBACK", QUERY_TYPE_ROLLBACK },
    { "ROLLBACK WORK", QUERY_TYPE_ROLLBACK },

    { "START TRANSACTION", QUERY_TYPE_BEGIN_TRX },

    { "START TRANSACTION READ ONLY", QUERY_TYPE_BEGIN_TRX | QUERY_TYPE_READ },
    { "START TRANSACTION READ WRITE", QUERY_TYPE_BEGIN_TRX | QUERY_TYPE_WRITE },

    { "START TRANSACTION WITH CONSISTENT SNAPSHOT", QUERY_TYPE_BEGIN_TRX },

    { "START TRANSACTION WITH CONSISTENT SNAPSHOT, READ ONLY", QUERY_TYPE_BEGIN_TRX | QUERY_TYPE_READ },

    { "SET AUTOCOMMIT=true", QUERY_TYPE_COMMIT|QUERY_TYPE_ENABLE_AUTOCOMMIT },

    { "SET AUTOCOMMIT=1", QUERY_TYPE_COMMIT|QUERY_TYPE_ENABLE_AUTOCOMMIT },

    { "SET AUTOCOMMIT=false", QUERY_TYPE_BEGIN_TRX|QUERY_TYPE_DISABLE_AUTOCOMMIT },

    { "SET AUTOCOMMIT=0", QUERY_TYPE_BEGIN_TRX|QUERY_TYPE_DISABLE_AUTOCOMMIT },
    { "SET @@AUTOCOMMIT=0", QUERY_TYPE_BEGIN_TRX|QUERY_TYPE_DISABLE_AUTOCOMMIT },
    { "SET GLOBAL AUTOCOMMIT=0", QUERY_TYPE_BEGIN_TRX|QUERY_TYPE_DISABLE_AUTOCOMMIT },
    { "SET SESSION AUTOCOMMIT=0", QUERY_TYPE_BEGIN_TRX|QUERY_TYPE_DISABLE_AUTOCOMMIT },
    { "SET @@SESSION . AUTOCOMMIT=0", QUERY_TYPE_BEGIN_TRX|QUERY_TYPE_DISABLE_AUTOCOMMIT },
    { "SET @@GLOBAL . AUTOCOMMIT=0", QUERY_TYPE_BEGIN_TRX|QUERY_TYPE_DISABLE_AUTOCOMMIT },
};

const size_t N_TEST_CASES = sizeof(test_cases)/sizeof(test_cases[0]);


bool test(uint32_t (*getter)(GWBUF*), const char* zStmt, uint32_t expected_type_mask)
{
    int rc = true;

    GWBUF* pBuf = create_gwbuf(zStmt);

    uint32_t type_mask = getter(pBuf);

    if (type_mask != expected_type_mask)
    {
        cerr << "\"" << zStmt << "\""
             << ": expected " << expected_type_mask << ", but got " << type_mask << "." << endl;
        rc = false;
    }

    gwbuf_free(pBuf);

    return rc;
}


const char* prefixes[] =
{
    " ",
    "  ",
    "\n",
    " \n",
    "\n ",
    "-- comment\n"
};

const int N_PREFIXES = sizeof(prefixes) / sizeof(prefixes[0]);

bool test_with_prefixes(uint32_t (*getter)(GWBUF*), const string& base, uint32_t type_mask)
{
    bool rc = true;

    for (int i = 0; i < N_PREFIXES; ++i)
    {
        string s = prefixes[i] + base;

        if (!test(getter, s.c_str(), type_mask))
        {
            rc = false;
        }
    }

    return rc;
}


const char* suffixes[] =
{
    " ",
    "  ",
    "\n",
    " \n",
    "\n ",
    ";",
    " ;",
    "  ;",
    " ;",
    "  ;",
    " ; ",
    ";\n",
    "  ;  ",
    "-- comment this, comment that",
    // "# comment this, comment that" /* qc_sqlite does not handle this */
};

const int N_SUFFIXES = sizeof(suffixes) / sizeof(suffixes[0]);

bool test_with_suffixes(uint32_t (*getter)(GWBUF*), const string& base, uint32_t type_mask)
{
    bool rc = true;

    for (int i = 0; i < N_SUFFIXES; ++i)
    {
        string s = base + suffixes[i];

        if (!test(getter, s.c_str(), type_mask))
        {
            rc = false;
        }
    }

    return rc;
}


const char* whitespace[] =
{
    "  ",
    "\n",
    "/**/",
    "/***/",
    "/****/",
    "/* / * */",
    "-- comment\n"
};

const int N_WHITESPACE = sizeof(whitespace) / sizeof(whitespace[0]);

bool test_with_whitespace(uint32_t (*getter)(GWBUF*), const string& base, uint32_t type_mask)
{
    bool rc = true;

    string::const_iterator i = base.begin();
    string::const_iterator end = base.end();

    string head;

    while (i != end)
    {
        if (*i == ' ')
        {
            string tail(i + 1, end);

            for (int j = 0; j < N_WHITESPACE; ++j)
            {
                string s = head + whitespace[j] + tail;

                if (!test(getter, s.c_str(), type_mask))
                {
                    rc = false;
                }
            }
        }

        head += *i;

        ++i;
    }

    return rc;
}


const char* commas[] =
{
    " ,",
    "  ,",
    " , ",
    " ,   ",
};

const int N_COMMAS = sizeof(commas) / sizeof(commas[0]);

bool test_with_commas(uint32_t (*getter)(GWBUF*), const string& base, uint32_t type_mask)
{
    bool rc = true;

    string::const_iterator i = base.begin();
    string::const_iterator end = base.end();

    string head;

    while (i != end)
    {
        if (*i == ',')
        {
            string tail(i + 1, end);

            for (int j = 0; j < N_COMMAS; ++j)
            {
                string s = head + commas[j] + tail;

                if (!test(getter, s.c_str(), type_mask))
                {
                    rc = false;
                }
            }
        }

        head += *i;

        ++i;
    }

    return rc;
}


bool test(uint32_t (*getter)(GWBUF*), bool dont_bail_out)
{
    bool rc = true;

    test_case* pTest = test_cases;
    test_case* pEnd  = pTest + N_TEST_CASES;

    while ((pTest < pEnd) && (dont_bail_out || rc))
    {
        string base(pTest->zStmt);
        cout << base << endl;

        string s;

        s = base;
        if (!test(getter, s.c_str(), pTest->type_mask))
        {
            rc = false;
        }

        if (dont_bail_out || rc)
        {
            if (!test_with_prefixes(getter, base, pTest->type_mask))
            {
                rc = false;
            }
        }

        if (dont_bail_out || rc)
        {
            if (!test_with_whitespace(getter, base, pTest->type_mask))
            {
                rc = false;
            }
        }

        if (dont_bail_out || rc)
        {
            if (!test_with_commas(getter, base, pTest->type_mask))
            {
                rc = false;
            }
        }

        if (dont_bail_out || rc)
        {
            if (!test_with_suffixes(getter, base, pTest->type_mask))
            {
                rc = false;
            }
        }

        ++pTest;
    }

    return rc;
}

}

namespace
{

char USAGE[] =
    "usage: test_trxtracking [-p] [-q] [-r] [-d]\n"
    "\n"
    "-p  : Test using custom parser\n"
    "-q  : Test using query classifier\n"
    "-r  : Test using regex matching\n"
    "-d  : Don't bail out at first error\n"
    "\n"
    "If neither -p, -q or -r has been specified, then all will be tested.\n";
}

int main(int argc, char* argv[])
{
    int rc = EXIT_SUCCESS;

    bool test_all = true;
    uint32_t test_target = 0;
    bool dont_bail_out = false;

    int c;
    while ((c = getopt(argc, argv, "dpq")) != -1)
    {
        switch (c)
        {
        case 'p':
            test_all = false;
            test_target |= TEST_PARSER;
            break;

        case 'q':
            test_all = false;
            test_target = TEST_QC;
            break;

        case 'd':
            dont_bail_out = true;
            break;

        default:
            cout << USAGE << endl;
            rc = EXIT_FAILURE;
        }
    }

    if (rc == EXIT_SUCCESS)
    {
        rc = EXIT_FAILURE;

        if (test_all)
        {
            test_target = TEST_ALL;
        }

        set_datadir(strdup("/tmp"));
        set_langdir(strdup("."));
        set_process_datadir(strdup("/tmp"));

        if (mxs_log_init(NULL, ".", MXS_LOG_TARGET_DEFAULT))
        {
            // We have to setup something in order for the regexes to be compiled.
            if (qc_setup("qc_sqlite", NULL) && qc_process_init(QC_INIT_BOTH))
            {
                rc = EXIT_SUCCESS;

                if (test_target & TEST_QC)
                {
                    cout << "QC" << endl;
                    cout << "==" << endl;
                    if (!test(get_qc_trx_type_mask, dont_bail_out))
                    {
                        rc = EXIT_FAILURE;
                    }
                    cout << endl;
                }

                if (test_target & TEST_PARSER)
                {
                    cout << "Parser" << endl;
                    cout << "======" << endl;
                    if (!test(get_parser_trx_type_mask, dont_bail_out))
                    {
                        rc = EXIT_FAILURE;
                    }
                    cout << endl;
                }

                qc_process_end(QC_INIT_BOTH);
            }
            else
            {
                cerr << "error: Could not initialize qc_sqlite." << endl;
            }

            mxs_log_finish();
        }
        else
        {
            cerr << "error: Could not initialize log." << endl;
        }
    }

    return rc;
}