/*
   Copyright (c) 2001, 2021, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#include "client_priv.h"
#include "my_default.h"
#include "mysqlcheck.h"
#include <m_ctype.h>
#include <mysql_version.h>
#include <mysqld_error.h>

#include <string>
#include <vector>

using namespace Mysql::Tools::Check;

using std::string;
using std::vector;


/* ALTER instead of repair. */
#define MAX_ALTER_STR_SIZE 128 * 1024
#define KEY_PARTITIONING_CHANGED_STR "KEY () partitioning changed"

static MYSQL *sock= 0;
static my_bool opt_alldbs= 0, opt_check_only_changed= 0, opt_extended= 0,
               opt_databases= 0, opt_fast= 0,
               opt_medium_check = 0, opt_quick= 0, opt_all_in_1= 0,
               opt_silent= 0, opt_auto_repair= 0, ignore_errors= 0,
               opt_frm= 0, opt_fix_table_names= 0, opt_fix_db_names= 0, opt_upgrade= 0,
               opt_write_binlog= 1;
static uint verbose = 0;
static string opt_skip_database;
int what_to_do = 0;

void (*DBError)(MYSQL *mysql, string when);

static int first_error = 0;
vector<string> tables4repair, tables4rebuild, alter_table_cmds, failed_tables;


static int process_all_databases();
static int process_databases(vector<string> db_names);
static int process_selected_tables(string db, vector<string> table_names);
static int process_all_tables_in_db(string database);
static int process_one_db(string database);
static int use_db(string database);
static int handle_request_for_tables(string tables);
static void print_result();
static string escape_table_name(string src);


static int process_all_databases()
{
  MYSQL_ROW row;
  MYSQL_RES *tableres;
  int result = 0;

  if (mysql_query(sock, "SHOW DATABASES") ||
      !(tableres = mysql_store_result(sock)))
  {
    my_printf_error(0, "Error: Couldn't execute 'SHOW DATABASES': %s",
                    MYF(0), mysql_error(sock));
    return 1;
  }
  while ((row = mysql_fetch_row(tableres)))
  {
    if (process_one_db(row[0]))
      result = 1;
  }
  mysql_free_result(tableres);
  return result;
}
/* process_all_databases */


static int process_databases(vector<string> db_names)
{
  int result = 0;
  vector<string>::iterator it;
  for (it= db_names.begin() ; it != db_names.end(); it++)
  {
    if (process_one_db(*it))
      result = 1;
  }
  return result;
} /* process_databases */


static int process_selected_tables(string db, vector<string> table_names)
{
  if (use_db(db))
    return 1;
  vector<string>::iterator it;

  for (it= table_names.begin(); it != table_names.end(); it++)
  {
    if (what_to_do != DO_UPGRADE)
      *it= escape_table_name(*it);
    handle_request_for_tables(*it);
  }
  return 0;
} /* process_selected_tables */


static inline void escape_str(string src, size_t start, size_t end, string &res)
{
  res+= '`';
  for (size_t i= start; i < end; i++)
  {
    switch (src[i]) {
    case '`':            /* Escape backtick character. */
      res+= '`';
      /* Fall through. */
    default:
      res+= src[i];
    }
  }
  res+= '`';
}


static string escape_table_name(string src)
{
  string res= "";

  escape_str(src, 0, src.length(), res);
  return res;
}


static string escape_db_table_name(string src, size_t dot_pos)
{
  string res= "";

  /* Escape database name. */
  escape_str(src, 0, dot_pos - 1, res);
  /* Add a dot. */
  res+= '.';
  /* Escape table name. */
  escape_str(src, dot_pos, src.length(), res);

  return res;
}

static int process_all_tables_in_db(string database)
{
  MYSQL_RES *res= NULL;
  MYSQL_ROW row;
  uint num_columns;

  if (use_db(database))
    return 1;
  if ((mysql_query(sock, "SHOW /*!50002 FULL*/ TABLES") &&
       mysql_query(sock, "SHOW TABLES")) ||
      !(res= mysql_store_result(sock)))
  {
    my_printf_error(0, "Error: Couldn't get table list for database %s: %s",
                    MYF(0), database.c_str(), mysql_error(sock));
    return 1;
  }

  num_columns= mysql_num_fields(res);

  vector<string> table_names;

  while ((row = mysql_fetch_row(res)))
  {
    /* Skip views if we don't perform renaming. */
    if ((what_to_do != DO_UPGRADE) && (num_columns == 2) && (strcmp(row[1], "VIEW") == 0))
      continue;

    table_names.push_back(row[0]);
  }
  mysql_free_result(res);

  process_selected_tables(database, table_names);
  return 0;
} /* process_all_tables_in_db */


static int run_query(string query)
{
  if (mysql_query(sock, query.c_str()))
  {
    fprintf(stderr, "Failed to run query \"%s\"\n", query.c_str());
    fprintf(stderr, "Error: %s\n", mysql_error(sock));
    return 1;
  }
  return 0;
}


static int fix_table_storage_name(string name)
{
  if (strncmp(name.c_str(), "#mysql50#", 9))
    return 1;
  int rc= run_query("RENAME TABLE `" + name + "` TO `" + name.substr(9) + "`");
  if (verbose)
    printf("%-50s %s\n", name.c_str(), rc ? "FAILED" : "OK");
  return rc;
}

static int fix_database_storage_name(string name)
{
  if (strncmp(name.c_str(), "#mysql50#", 9))
    return 1;
  int rc= run_query("ALTER DATABASE `" + name + "` UPGRADE DATA DIRECTORY NAME");
  if (verbose)
    printf("%-50s %s\n", name.c_str(), rc ? "FAILED" : "OK");
  return rc;
}

static int rebuild_table(string name)
{
  int rc= 0;
  string query= "ALTER TABLE " + name + " FORCE";
  if (mysql_real_query(sock, query.c_str(), (ulong)query.length()))
  {
    fprintf(stderr, "Failed to %s\n", query.c_str());
    fprintf(stderr, "Error: %s\n", mysql_error(sock));
    rc= 1;
  }
  else
    printf("%s\nRunning  : %s\nstatus   : OK\n", name.c_str(), query.c_str());
  return rc;
}

static int process_one_db(string database)
{
  if (opt_skip_database.length() > 0 && opt_alldbs
    && database == opt_skip_database)
    return 0;

  if (what_to_do == DO_UPGRADE)
  {
    int rc= 0;
    if (opt_fix_db_names && !strncmp(database.c_str(),"#mysql50#", 9))
    {
      rc= fix_database_storage_name(database);
      database= database.substr(9);
    }
    if (rc || !opt_fix_table_names)
      return rc;
  }
  return process_all_tables_in_db(database);
}


static int use_db(string database)
{
  if (mysql_get_server_version(sock) >= FIRST_INFORMATION_SCHEMA_VERSION &&
      !my_strcasecmp(
        &my_charset_latin1, database.c_str(), INFORMATION_SCHEMA_DB_NAME))
    return 1;
  if (mysql_get_server_version(sock) >= FIRST_PERFORMANCE_SCHEMA_VERSION &&
      !my_strcasecmp(
        &my_charset_latin1, database.c_str(), PERFORMANCE_SCHEMA_DB_NAME))
    return 1;
  if (mysql_select_db(sock, database.c_str()))
  {
    DBError(sock, "when selecting the database");
    return 1;
  }
  return 0;
} /* use_db */

static int disable_binlog()
{
  return run_query("SET SQL_LOG_BIN=0");
}

static int handle_request_for_tables(string tables)
{
  string operation, options;

  switch (what_to_do) {
  case DO_CHECK:
    operation = "CHECK";
    if (opt_quick)              options+= " QUICK";
    if (opt_fast)               options+= " FAST";
    if (opt_medium_check)       options+= " MEDIUM"; /* Default */
    if (opt_extended)           options+= " EXTENDED";
    if (opt_check_only_changed) options+= " CHANGED";
    if (opt_upgrade)            options+= " FOR UPGRADE";
    break;
  case DO_REPAIR:
    operation= (opt_write_binlog) ? "REPAIR" : "REPAIR NO_WRITE_TO_BINLOG";
    if (opt_quick)              options+= " QUICK";
    if (opt_extended)           options+= " EXTENDED";
    if (opt_frm)                options+= " USE_FRM";
    break;
  case DO_ANALYZE:
    operation= (opt_write_binlog) ? "ANALYZE" : "ANALYZE NO_WRITE_TO_BINLOG";
    break;
  case DO_OPTIMIZE:
    operation= (opt_write_binlog) ? "OPTIMIZE" : "OPTIMIZE NO_WRITE_TO_BINLOG";
    break;
  case DO_UPGRADE:
    return fix_table_storage_name(tables);
  }

  string query= operation + " TABLE " + tables + " " + options;

  if (mysql_real_query(sock, query.c_str(), (ulong)query.length()))
  {
    DBError(sock,
      "when executing '" + operation + " TABLE ... " + options + "'");
    return 1;
  }
  print_result();
  return 0;
}


static void print_result()
{
  MYSQL_RES *res;
  MYSQL_ROW row;
  char prev[NAME_LEN*3+2];
  char prev_alter[MAX_ALTER_STR_SIZE];
  uint i;
  size_t dot_pos;
  my_bool found_error=0, table_rebuild=0;

  res = mysql_use_result(sock);
  dot_pos= strlen(sock->db) + 1;

  prev[0] = '\0';
  prev_alter[0]= 0;
  for (i = 0; (row = mysql_fetch_row(res)); i++)
  {
    int changed = strcmp(prev, row[0]);
    my_bool status = !strcmp(row[2], "status");

    if (status)
    {
      /*
        if there was an error with the table, we have --auto-repair set,
        and this isn't a repair op, then add the table to the tables4repair
        list
      */
      if (found_error && opt_auto_repair && what_to_do != DO_REPAIR &&
          strcmp(row[3],"OK"))
      {
        if (table_rebuild)
        {
          if (prev_alter[0])
            alter_table_cmds.push_back(prev_alter);
          else
            tables4rebuild.push_back(escape_db_table_name(prev, dot_pos));
        }
        else
        {
          tables4repair.push_back(escape_db_table_name(prev, dot_pos));
        }

      }
      found_error=   0;
      table_rebuild= 0;
      prev_alter[0]= '\0';
      if (opt_silent)
        continue;
    }
    if (status && changed)
      printf("%-50s %s", row[0], row[3]);
    else if (!status && changed)
    {
      printf("%s\n%-9s: %s", row[0], row[2], row[3]);
      if (opt_auto_repair && strcmp(row[2],"note"))
      {
        const char *alter_txt= strstr(row[3], "ALTER TABLE");
        found_error= 1;

        if (alter_txt)
        {
          table_rebuild= 1;
          const char *match_str;
          if (!strncmp(row[3], KEY_PARTITIONING_CHANGED_STR,
                       strlen(KEY_PARTITIONING_CHANGED_STR)))
          {
            if (strstr(alter_txt, "PARTITION BY") &&
                strlen(alter_txt) < MAX_ALTER_STR_SIZE)
            {
              strncpy(prev_alter, alter_txt, MAX_ALTER_STR_SIZE-1);
              prev_alter[MAX_ALTER_STR_SIZE-1]= 0;
            }
            else
            {
               printf("\nError: Alter command unknown or too long (%d >= %d), "
                      "please investigate the above or dump/reload to fix it!"
                      "\n",
                      (int)strlen(alter_txt),
                      MAX_ALTER_STR_SIZE);
              found_error=   0;
              table_rebuild= 0;
              prev_alter[0]= '\0';
              failed_tables.push_back(row[0]);
            }
          }
          else if ((match_str= strstr(alter_txt, "` UPGRADE PARTITIONING")) &&
                   strlen(match_str) == 22)
          {
            strcpy(prev_alter, alter_txt);
          }
        }
	else
        {
          /*
            Search the error message specific to pre 5.0 decimal type.
            "REPAIR TABLE" should not be present in the error message and
            "dump/reload" should be present in the error message. In this
            case, do not add table to the repair list.
          */
          const char *repair_txt= strstr(row[3], "REPAIR TABLE");
          const char *dump_txt= strstr(row[3], "dump/reload table");
          if (dump_txt && !repair_txt)
          {
            found_error= 0;
            table_rebuild= 0;
            prev_alter[0]= '\0';
            failed_tables.push_back(row[0]);
          }
        }
      }
    }
    else
      printf("%-9s: %s", row[2], row[3]);

    my_stpcpy(prev, row[0]);
    putchar('\n');
  }
  /* add the last table to be repaired to the list */
  if (found_error && opt_auto_repair && what_to_do != DO_REPAIR)
  {
    if (table_rebuild)
    {
      if (prev_alter[0])
        alter_table_cmds.push_back(prev_alter);
      else
        tables4rebuild.push_back(escape_db_table_name(prev, dot_pos));
    }
    else
    {
      tables4repair.push_back(escape_db_table_name(prev, dot_pos));
    }
  }
  mysql_free_result(res);
}

void Mysql::Tools::Check::mysql_check(MYSQL* connection, int what_to_do,
                my_bool opt_alldbs,
                my_bool opt_check_only_changed, my_bool opt_extended,
                my_bool opt_databases, my_bool opt_fast,
                my_bool opt_medium_check, my_bool opt_quick,
                my_bool opt_all_in_1, my_bool opt_silent,
                my_bool opt_auto_repair, my_bool ignore_errors,
                my_bool opt_frm, my_bool opt_fix_table_names,
                my_bool opt_fix_db_names, my_bool opt_upgrade,
                my_bool opt_write_binlog, uint verbose,
                string opt_skip_database, vector<string> arguments,
                void (*dberror)(MYSQL *mysql, string when))
{
  ::sock= connection;
  ::what_to_do= what_to_do;
  ::opt_alldbs= opt_alldbs;
  ::opt_check_only_changed= opt_check_only_changed;
  ::opt_extended= opt_extended;
  ::opt_databases= opt_databases;
  ::opt_fast= opt_fast;
  ::opt_medium_check= opt_medium_check;
  ::opt_quick= opt_quick;
  ::opt_all_in_1= opt_all_in_1;
  ::opt_silent= opt_silent;
  ::opt_auto_repair= opt_auto_repair;
  ::ignore_errors= ignore_errors;
  ::opt_frm= opt_frm;
  ::opt_fix_table_names= opt_fix_table_names;
  ::opt_fix_db_names= opt_fix_db_names;
  ::opt_upgrade= opt_upgrade;
  ::opt_write_binlog= opt_write_binlog;
  ::verbose= verbose;
  ::opt_skip_database= opt_skip_database;
  ::DBError= dberror;

  if (!::opt_write_binlog)
  {
    if (disable_binlog()) {
      first_error= 1;
      return;
    }
  }

  if (::opt_alldbs)
    process_all_databases();
  /* Only one database and selected table(s) */
  else if (arguments.size() > 1 && !::opt_databases)
  {
    string db_name= arguments[0];
    arguments.erase(arguments.begin());
    process_selected_tables(db_name, arguments);
  }
  /* One or more databases, all tables */
  else
    process_databases(arguments);
  if (::opt_auto_repair)
  {
    if (!::opt_silent)
    {
      if (!(tables4repair.empty() && tables4rebuild.empty()))
        puts("\nRepairing tables");

      if (!(alter_table_cmds.empty()))
        puts("\nUpgrading tables");
    }

    ::what_to_do = DO_REPAIR;

    vector<string>::iterator it;
    for (it = tables4repair.begin(); it != tables4repair.end() ; it++)
    {
      handle_request_for_tables(*it);
    }
    for (it = tables4rebuild.begin(); it != tables4rebuild.end() ; it++)
    {
      rebuild_table(*it);
    }
    for (it = alter_table_cmds.begin(); it != alter_table_cmds.end() ; it++)
    {
      if (0 == run_query(*it))
        printf("Running  : %s\nstatus   : OK\n", (*it).c_str());
      else
      {
        fprintf(stderr, "Failed to %s\n", (*it).c_str());
        fprintf(stderr, "Error: %s\n", mysql_error(sock));
      }
    }
    if (!failed_tables.empty())
    {
      fprintf(stderr,
              "These tables cannot be automatically upgraded,"
              " see the log above:\n");
    }
    for (it = failed_tables.begin(); it != failed_tables.end() ; it++)
    {
      fprintf(stderr, "%s\n", it->c_str());
    }
  }
}

Program::Program()
  : m_what_to_do(0),
  m_auto_repair(false),
  m_upgrade(false),
  m_verbose(false),
  m_ignore_errors(false),
  m_write_binlog(false),
  m_process_all_dbs(false),
  m_fix_table_names(false),
  m_fix_db_names(false),
  m_connection(NULL),
  m_error_callback(NULL)
{
}

int Program::check_databases(MYSQL* connection, vector<string> databases)
{
  this->m_connection= connection;
  this->m_process_all_dbs= false;
  return this->set_what_to_do(DO_CHECK)
    ->execute(databases);
}

int Program::check_all_databases(MYSQL* connection)
{
  this->m_connection= connection;
  this->m_process_all_dbs= true;
  return this->set_what_to_do(DO_CHECK)
    ->execute(vector<string>());
}

int Program::upgrade_databases(MYSQL* connection, vector<string> databases)
{
  this->m_connection= connection;
  this->m_process_all_dbs= false;
  return this->set_what_to_do(DO_UPGRADE)
    ->execute(databases);
}

int Program::upgrade_all_databases(MYSQL* connection)
{
  this->m_connection= connection;
  this->m_process_all_dbs= true;
  return this->set_what_to_do(DO_UPGRADE)
    ->execute(vector<string>());
}

Program* Program::enable_auto_repair(bool enable)
{
  this->m_auto_repair= enable;
  return this;
}

Program* Program::enable_upgrade(bool enable)
{
  this->m_upgrade= enable;
  return this;
}

Program* Program::enable_verbosity(bool enable)
{
  this->m_verbose= enable;
  return this;
}

Program* Program::enable_writing_binlog(bool enable)
{
  this->m_write_binlog= enable;
  return this;
}

Program* Program::enable_fixing_table_names(bool enable)
{
  this->m_fix_table_names= enable;
  return this;
}

Program* Program::enable_fixing_db_names(bool enable)
{
  this->m_fix_db_names= enable;
  return this;
}

Program* Program::set_ignore_errors(bool ignore)
{
  this->m_ignore_errors= ignore;
  return this;
}

Program* Program::set_skip_database(string database)
{
  this->m_database_to_skip= database;
  return this;
}

Program* Program::set_error_callback(void (
  *error_callback)(MYSQL *mysql, string when))
{
  this->m_error_callback= error_callback;
  return this;
}

Program* Program::set_what_to_do(int functionality)
{
  this->m_what_to_do= functionality;
  return this;
}

int Program::execute(vector<string> positional_options)
{
  Mysql::Tools::Check::mysql_check(
    this->m_connection, // connection
    this->m_what_to_do, // what_to_do
    this->m_process_all_dbs, // opt_alldbs
    false, // opt_check_only_changed
    false, // opt_extended
    !this->m_process_all_dbs, // opt_databases
    false, // opt_fast
    false, // opt_medium_check
    false, // opt_quick
    false, // opt_all_in_1
    false, // opt_silent
    this->m_auto_repair, // opt_auto_repair
    this->m_ignore_errors, // ignore_errors
    false, // opt_frm
    this->m_fix_table_names, // opt_fix_table_names
    this->m_fix_db_names, // opt_fix_db_names
    this->m_upgrade, // opt_upgrade
    this->m_write_binlog, // opt_write_binlog
    this->m_verbose, // verbose
    this->m_database_to_skip,
    positional_options,
    this->m_error_callback);
  return 0;
}

