# -*- cperl -*-
# Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
#
# 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

#
# Utility functions to work with list of options
#

package My::Options;

use strict;

sub same($$) {
  my $l1 = shift;
  my $l2 = shift;
  return compare($l1, $l2) == 0;
}

sub compare ($$) {
  my $l1 = shift;
  my $l2 = shift;

  my @l1 = sort @$l1;
  my @l2 = sort @$l2;

  return -1 if @l1 < @l2;
  return 1  if @l1 > @l2;

  # Same length
  while (@l1) {
    my $e1 = shift @l1;
    my $e2 = shift @l2;

    $e1 =~ s/_/-/g;
    $e2 =~ s/_/-/g;

    my $cmp = ($e1 cmp $e2);
    return $cmp if $cmp != 0;
  }

  # They are the same
  return 0;
}

sub split_option {
  my ($option) = @_;

  if ($option =~ /^--(.*?)=(.*)$/) {
    return ($1, $2);
  } elsif ($option =~ /^--(.*)$/) {
    return ($1, undef);
  } elsif ($option =~ /^\$(.*)$/) {
    # $VAR
    return ($1, undef);
  } elsif ($option =~ /^(.*?)=(.*)$/) {
    return ($1, $2);
  }

  # Unknown option
  die "Unknown option format '$option'";
}

sub _build_option {
  my ($name, $value) = @_;

  if ($name =~ /^O, /) {
    return "-" . $name . "=" . $value;
  } elsif ($value) {
    return "--" . $name . "=" . $value;
  }

  return "--" . $name;
}

# Compare two list of options and return what would need to be
# done to get the server running with the new settings.
sub diff {
  my ($from_opts, $to_opts) = @_;

  my %from;
  foreach my $from (@$from_opts) {
    my ($opt, $value) = split_option($from);
    next unless defined($opt);
    $from{$opt} = $value;
  }

  my %to;
  foreach my $to (@$to_opts) {
    my ($opt, $value) = split_option($to);
    next unless defined($opt);
    $to{$opt} = $value;
  }

  # Remove the ones that are in both lists
  foreach my $name (keys %from) {
    if (exists $to{$name} and $to{$name} eq $from{$name}) {
      delete $to{$name};
      delete $from{$name};
    }
  }

  # Add all keys in "to" to result
  my @result;
  foreach my $name (keys %to) {
    push(@result, _build_option($name, $to{$name}));
  }

  # Add all keys in "from" that are not in "to"
  # to result as "set to default"
  foreach my $name (keys %from) {
    if (not exists $to{$name}) {
      push(@result, _build_option($name, "default"));
    }
  }

  return @result;
}

sub is_set {
  my ($opts, $set_opts) = @_;
  my $temp_opt1;
  my $temp_opt2;

  foreach my $opt (@$opts) {
    if ($opt =~ /^(\s*)--initialize(\s*)=(\s*)/) {
      $temp_opt1 = $opt;
      $temp_opt1 =~ s/--initialize(\s*)=(\s*)//;
    } elsif ($opt =~ /^(\s*)--initialize(\s*)/) {
      next;
    }
    my $opt_name1;
    my $value1;
    if ($temp_opt1) {
      ($opt_name1, $value1) = split_option($temp_opt1);
    } else {
      ($opt_name1, $value1) = split_option($opt);
    }
    foreach my $set_opt (@$set_opts) {
      if ($set_opt =~ /^(\s*)--initialize(\s)*=(\s*)/) {
        $temp_opt2 = $set_opt;
        $temp_opt2 =~ s/--initialize(\s)*=(\s*)//;
      }

      my $opt_name2;
      my $value2;
      if ($temp_opt2) {
        ($opt_name2, $value2) = split_option($temp_opt2);
      } else {
        ($opt_name2, $value2) = split_option($set_opt);
      }
      return 1 if (option_equals($opt_name1, $opt_name2));
    }
  }

  return 0;
}

sub toSQL {
  my (@options) = @_;
  my @sql;

  foreach my $option (@options) {
    my ($sql_name, $value) = split_option($option);
    $sql_name =~ s/-/_/g;
    push(@sql, "SET GLOBAL $sql_name=$value");
  }
  return join("; ", @sql);
}

sub toStr {
  my $name = shift;
  return "$name: ", "['", join("', '", @_), "']\n";
}

sub option_equals {
  my ($string1, $string2) = @_;
  $string1 =~ s/_/-/g;
  $string2 =~ s/_/-/g;
  return ($string1 eq $string2);
}

1;