###############################################################################
## ----------------------------------------------------------------------------
## MCE::Core::Validation - Core validation methods for Many-Core Engine.
##
## This package provides validation methods used internally by the manager
## process.
##
## There is no public API.
##
###############################################################################

package MCE::Core::Validation;

use strict;
use warnings;

our $VERSION = '1.600';

## Items below are folded into MCE.

package MCE;

## Warnings are disabled to minimize bits of noise when user or OS signals
## the script to exit. e.g. MCE_script.pl < infile | head

no warnings 'threads';
no warnings 'uninitialized';

###############################################################################
## ----------------------------------------------------------------------------
## Validation method (attributes allowed for top-level).
##
###############################################################################

sub _validate_args {

   my $_s = $_[0];

   @_ = ();

   die 'Private method called' unless (caller)[0]->isa( ref $_s );

   my $_tag = 'MCE::_validate_args';

   if (defined $_s->{input_data} && ref $_s->{input_data} eq '') {
      _croak("$_tag: ($_s->{input_data}) does not exist")
         unless (-e $_s->{input_data});
   }

   _croak("$_tag: (use_slurpio) is not 0 or 1")
      if ($_s->{use_slurpio} && $_s->{use_slurpio} !~ /\A[01]\z/);
   _croak("$_tag: (parallel_io) is not 0 or 1")
      if ($_s->{parallel_io} && $_s->{parallel_io} !~ /\A[01]\z/);

   _croak("$_tag: (job_delay) is not valid")
      if ($_s->{job_delay} && (!looks_like_number($_s->{job_delay}) ||
         $_s->{job_delay} < 0));
   _croak("$_tag: (spawn_delay) is not valid")
      if ($_s->{spawn_delay} && (!looks_like_number($_s->{spawn_delay}) ||
         $_s->{spawn_delay} < 0));
   _croak("$_tag: (submit_delay) is not valid")
      if ($_s->{submit_delay} && (!looks_like_number($_s->{submit_delay}) ||
         $_s->{submit_delay} < 0));

   _croak("$_tag: (freeze) is not a CODE reference")
      if ($_s->{freeze} && ref $_s->{freeze} ne 'CODE');
   _croak("$_tag: (thaw) is not a CODE reference")
      if ($_s->{thaw} && ref $_s->{thaw} ne 'CODE');

   _croak("$_tag: (on_post_exit) is not a CODE reference")
      if ($_s->{on_post_exit} && ref $_s->{on_post_exit} ne 'CODE');
   _croak("$_tag: (on_post_run) is not a CODE reference")
      if ($_s->{on_post_run} && ref $_s->{on_post_run} ne 'CODE');
   _croak("$_tag: (user_error) is not a CODE reference")
      if ($_s->{user_error} && ref $_s->{user_error} ne 'CODE');
   _croak("$_tag: (user_output) is not a CODE reference")
      if ($_s->{user_output} && ref $_s->{user_output} ne 'CODE');

   _croak("$_tag: (flush_file) is not 0 or 1")
      if ($_s->{flush_file} && $_s->{flush_file} !~ /\A[01]\z/);
   _croak("$_tag: (flush_stderr) is not 0 or 1")
      if ($_s->{flush_stderr} && $_s->{flush_stderr} !~ /\A[01]\z/);
   _croak("$_tag: (flush_stdout) is not 0 or 1")
      if ($_s->{flush_stdout} && $_s->{flush_stdout} !~ /\A[01]\z/);

   _validate_args_s($_s);

   if (defined $_s->{user_tasks}) {
      for my $_t (@{ $_s->{user_tasks} }) {
         _validate_args_s($_s, $_t);

         _croak("$_tag: (task_end) is not a CODE reference")
            if ($_t->{task_end} && ref $_t->{task_end} ne 'CODE');
      }
   }

   return;
}

###############################################################################
## ----------------------------------------------------------------------------
## Validation method (top-level and sub-tasks).
##
###############################################################################

sub _validate_args_s {

   my $self = $_[0]; my $_s = $_[1] || $self;

   @_ = ();

   die 'Private method called' unless (caller)[0]->isa( ref $self );

   my $_tag = 'MCE::_validate_args_s';

   if (defined $_s->{max_workers}) {
      $_s->{max_workers} = _parse_max_workers($_s->{max_workers});
      _croak("$_tag: (max_workers) is not valid")
         if ($_s->{max_workers} !~ /\A\d+\z/);
   }

   if (defined $_s->{chunk_size}) {
      if ($_s->{chunk_size} =~ /([0-9\.]+)K\z/i) {
         $_s->{chunk_size} = int($1 * 1024 + 0.5);
      }
      elsif ($_s->{chunk_size} =~ /([0-9\.]+)M\z/i) {
         $_s->{chunk_size} = int($1 * 1024 * 1024 + 0.5);
      }

      _croak("$_tag: (chunk_size) is not valid")
         if ($_s->{chunk_size} !~ /\A\d+\z/ or $_s->{chunk_size} == 0);

      $_s->{chunk_size} = MAX_CHUNK_SIZE
         if ($_s->{chunk_size} > MAX_CHUNK_SIZE);
   }

   _croak("$_tag: (RS) is not valid")
      if ($_s->{RS} && ref $_s->{RS} ne '');
   _croak("$_tag: (use_threads) is not 0 or 1")
      if ($_s->{use_threads} && $_s->{use_threads} !~ /\A[01]\z/);
   _croak("$_tag: (user_begin) is not a CODE reference")
      if ($_s->{user_begin} && ref $_s->{user_begin} ne 'CODE');
   _croak("$_tag: (user_func) is not a CODE reference")
      if ($_s->{user_func} && ref $_s->{user_func} ne 'CODE');
   _croak("$_tag: (user_end) is not a CODE reference")
      if ($_s->{user_end} && ref $_s->{user_end} ne 'CODE');

   if (defined $_s->{gather}) {
      my $_ref = ref $_s->{gather};
      _croak("$_tag: (gather) is not a valid reference")
         if ( $_ref ne 'MCE::Queue' && $_ref ne 'Thread::Queue' &&
              $_ref ne 'ARRAY' && $_ref ne 'HASH' && $_ref ne 'CODE' );
   }

   if (defined $_s->{init_relay}) {
      my $_ref = ref $_s->{init_relay};
      _croak("$_tag: (init_relay) is not valid")
         if ($_ref ne '' && $_ref ne 'ARRAY' && $_ref ne 'HASH');
   }

   if (defined $_s->{sequence}) {
      my $_seq = $_s->{sequence};

      if (ref $_seq eq 'ARRAY') {
         my ($_begin, $_end, $_step, $_fmt) = @{ $_seq };
         $_seq = {
            begin => $_begin, end => $_end, step => $_step, format => $_fmt
         };
      }
      else {
         _croak("$_tag: (sequence) is not a HASH or ARRAY reference")
            if (ref $_seq ne 'HASH');
      }

      _croak("$_tag: (begin) is not defined for sequence")
         unless (defined $_seq->{begin});
      _croak("$_tag: (end) is not defined for sequence")
         unless (defined $_seq->{end});

      for (qw(begin end step)) {
         _croak("$_tag: ($_) is not valid for sequence")
            if (defined $_seq->{$_} && !looks_like_number($_seq->{$_}));
      }

      unless (defined $_seq->{step}) {
         $_seq->{step} = ($_seq->{begin} < $_seq->{end}) ? 1 : -1;
         if (ref $_s->{sequence} eq 'ARRAY') {
            $_s->{sequence}->[2] = $_seq->{step};
         }
      }
      if ( ($_seq->{step} < 0 && $_seq->{begin} < $_seq->{end}) ||
           ($_seq->{step} > 0 && $_seq->{begin} > $_seq->{end}) ||
           ($_seq->{step} == 0)
      ) {
         _croak("$_tag: impossible (step size) for sequence");
      }
   }

   if (defined $_s->{interval}) {
      if (ref $_s->{interval} eq '') {
         $_s->{interval} = { delay => $_s->{interval} };
      }

      my $_i = $_s->{interval};

      _croak("$_tag: (interval) is not a HASH reference")
         if (ref $_i ne 'HASH');
      _croak("$_tag: (delay) is not defined for interval")
         unless (defined $_i->{delay});
      _croak("$_tag: (delay) is not valid for interval")
         if (!looks_like_number($_i->{delay}) || $_i->{delay} < 0);

      for (qw(max_nodes node_id)) {
         _croak("$_tag: ($_) is not valid for interval")
            if (defined $_i->{$_} && (
               !looks_like_number($_i->{$_}) || int($_i->{$_}) != $_i->{$_} ||
               $_i->{$_} < 1
            ));
      }
      $_i->{max_nodes} = 1 unless (exists $_i->{max_nodes});
      $_i->{node_id}   = 1 unless (exists $_i->{node_id});
      $_i->{_time}     = time;
   }

   return;
}

###############################################################################
## ----------------------------------------------------------------------------
## Validation method (run state).
##
###############################################################################

sub _validate_runstate {

   my $self = $_[0]; my $_tag = $_[1];

   @_ = ();

   die 'Private method called' unless (caller)[0]->isa( ref $self );

   _croak("$_tag: method cannot be called by the worker process")
      if ($self->{_wid});
   _croak("$_tag: method cannot be called while processing")
      if ($self->{_send_cnt});
   _croak("$_tag: method cannot be called while running")
      if ($self->{_total_running});

   return;
}

1;