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package Alien::Proj4;

use strict;
use warnings;
use parent qw( Alien::Base );

our $VERSION = '2.019113';

#  most of the following are for compat with PDLA Makefiles
#  and should not be used by other code
sub installed {1}

sub import {
    #  do nothing
    return;
}

sub default_lib {
    return;
}

sub default_inc {
    return;
}

sub libflags {
    my ($class) = @_;
    my $flags = join ' ',  $class->libs;
    return $flags;
}

sub incflags {
    my ($class) = @_;
    my $flags = $class->cflags;
    return $flags;
}

# dup of code currently in PDLA::GIS::Proj
sub load_projection_descriptions {
  my ($class) = @_;
  my $incflags = $class->cflags;
  my $libflags = $class->libs;

  require Inline;
  Inline->bind(C => <<'EOF', inc => $incflags, libs => $libflags) unless defined &list_projections;
#include "projects.h"
HV *list_projections() {
  struct PJ_LIST *lp;
  SV* scalar_val;
  HV *hv = newHV();
  for (lp = pj_get_list_ref() ; lp->id ; ++lp) {
      scalar_val  = newSVpv( *lp->descr, 0 );
      hv_store( hv, lp->id, strlen( lp->id ), scalar_val, 0 );
  }
  return hv;
}
EOF
  list_projections();
}

# dup of code currently in PDLA::GIS::Proj
sub load_projection_information {
    my ($class) = @_;
    my $descriptions = $class->load_projection_descriptions();
    my $info = {};
    foreach my $projection ( keys %$descriptions ) {
        my $description = $descriptions->{$projection};
        my @lines = split( /\n/, $description );
        chomp @lines;
        #  skip conversion entries if they appear
        next if !defined $lines[1];

        my $hash = {};
        $hash->{CODE} = $projection;
        # Full name of this projection:
        $hash->{NAME} = $lines[0];
        # The second line is usually a list of projection types this one is:
        my $temp = $lines[1];
        $temp =~ s/no inv\.*,*//;
        $temp =~ s/or//;
        my @temp_types = split(/[,&\s]/, $temp );
        my @types = grep( /.+/, @temp_types );
        $hash->{CATEGORIES} = \@types;
        # If there's more than 2 lines, then it usually is a listing of parameters:
        # General parameters for all projections:
        $hash->{PARAMS}->{GENERAL} =
            [ qw( x_0 y_0 lon_0 units init no_defs geoc over ) ];
        # Earth Figure Parameters:
        $hash->{PARAMS}->{EARTH} =
            [ qw( ellps b f rf e es R R_A R_V R_a R_g R_h R_lat_g ) ];
        # Projection Specific Parameters:
        my @proj_params = ();
        if( $#lines >= 2 ) {
            foreach my $i ( 2 .. $#lines ) {
                my $text = $lines[$i];
                my @temp2 = split( /\s+/, $text );
                my @params = grep( /.+/, @temp2 );
                foreach my $param (@params) {
                    $param =~ s/=//;
                    $param =~ s/[,\[\]]//sg;
                    next if $param =~ /^and|or|Special|for|Madagascar|fixed|Earth|For|CH1903$/;
                    push(@proj_params, $param);
                }
            }
        }