#!/usr/bin/perl

use strict;
use warnings;
use Wx;

package Unifont;

use GD qw (:DEFAULT :cmp);

sub LoadHexFile {
	my ($input) = @_;
	my %hexlist = ();

	open (HEXFILE, "$input") or die ("Cannot open hex file for input\n");

	while (<HEXFILE>) {
		chomp;
		my @data = split (':', $_);

		my $codepoint = hex ($data[0]);
		my $char = $data[1];
#		my $display_width = $codepoint > 0xFFFF ? 6 : 4;
		# Use 6-digit codepoint for all glyphs for now
		my $display_width = 6;

		$hexlist{sprintf ("%0*X", $display_width, $codepoint)} = $char;
	}

	return %hexlist;
}

sub Hex2PNG {
	my ($hexlist_ref, $pagenum, $charheight) = @_;
	my %hexlist = %$hexlist_ref;

	if ($pagenum > 0x10FF) {
		die ("Invalid page.\n");
	}

	my $charxoffset = 4;
	my $gridxoffset = 48;
	my $gridyoffset = 32;
	my ($charyoffset, $boxsize, $xmax, $ymax, $charmaxwidth);

	if (not $charheight) {
		$charheight = 16;
	}

	if ($charheight == 16) {
		$charyoffset = 7;
		$boxsize = 32;
		$xmax = 2;
		$ymax = 1;
		$charmaxwidth = 6;
	} elsif ($charheight == 24) {
		$charyoffset = 4;
		$boxsize = 32;
		$xmax = 2;
		$ymax = 2;
		$charmaxwidth = 6;
	} elsif ($charheight == 32) {
		$charyoffset = 4;
		$boxsize = 40;
		$xmax = 3;
		$ymax = 3;
		$charmaxwidth = 8;
	} else {
		die ("Invalid height.\n");
	}

	# Create box and set as tile pattern

	my $box = new GD::Image ($boxsize, $boxsize);

	my $black = $box->colorAllocate (0, 0, 0);
	my $white = $box->colorAllocate (255, 255, 255);

	$box->filledRectangle (1, 1, $boxsize - 1, $boxsize - 1, $white);

	# Draw dots at 8 pixel boundaries
	 for (my $count = 0; $count <= $xmax; $count++) {
		$box->setPixel (($count * 8) + $charxoffset + 1, 0, $white);
		$box->setPixel (($count * 8) + $charxoffset + 8, 0, $white);
	}

	for (my $count = 0; $count <= $ymax; $count++) {
		$box->setPixel (0, ($count * 8) + $charyoffset + 1, $white);
		$box->setPixel (0, ($count * 8) + $charyoffset + 8, $white);
	}

	# Draw grid

	my $im = new GD::Image ($boxsize * 16 + $gridxoffset, $boxsize * 16 + $gridyoffset);

	$black = $im->colorAllocate (0, 0, 0);
	$white = $im->colorAllocate (255, 255, 255);

	$im->fill (0, 0, $white);

	for (my $xcount = 0; $xcount <= 16; $xcount++) {
		for (my $ycount = 0; $ycount <= 16; $ycount++) {
			$im->copy ($box, $xcount * $boxsize + $gridxoffset - 1, $ycount * $boxsize + $gridyoffset - 1, 0, 0, $boxsize, $boxsize);
		}
	}

	# Print plane
	$im->string (gdLargeFont, 8, 9, sprintf ('U+%02X', $pagenum >> 8), $black);

	# Print row headers
	for (my $count = 0; $count <= 15; $count++) {
		$im->string (gdLargeFont, 32, ($count * $boxsize) + (($boxsize - 16) / 2) + $gridyoffset, sprintf ('%X', $count), $black);
	}

	# Print column headers
	for (my $count = 0; $count <= 15; $count++) {
		$im->string (gdLargeFont, ($count * $boxsize) + (($boxsize - 24) / 2) + $gridxoffset, 9, sprintf ('%03X', (($pagenum & 0xFF) << 4) + $count), $black);
	}

	while ((my $codepoint, my $char) = each %hexlist) {
		if ($codepoint and $codepoint =~ m/^[0-9A-F]{4,6}$/) {
			my $cp = hex ($codepoint);

			# Calculate if codepoint is within page
			if ($cp >> 8 == $pagenum) {
				# Calculate character width, column and row
				my $charwidth = length ($char) / $charheight;

				if ($charwidth <= $charmaxwidth) {
					my $col = ($cp >> 4) & 0xF;
					my $row = $cp & 0xF;

					for (my $j = 0; $j < $charheight; $j++) {
						# Get character row
						my $r = hex (substr ($char, $j * $charwidth, $charwidth));

						# Draw character
						for (my $i = 0; $i < $charwidth * 4; $i++) {
							if ($r & 1 << $i) {
								$im->setPixel (($col * $boxsize) + ($charwidth * 4 - $i) + $charxoffset + $gridxoffset - 1, ($row * $boxsize) + $j + $charyoffset + $gridyoffset, $black);
							}
						}
					}
				}
			}
		}
	}

	return $im;
}

package UnifontViewer;

use base qw (Wx::App);
use Wx qw (wxMINIMIZE_BOX wxSYSTEM_MENU wxCAPTION wxCLOSE_BOX wxCLIP_CHILDREN);

sub OnInit {
	my $self  = shift;
	my $frame = UnifontViewerFrame->new (
		undef,
		-1,
		'Unifont Viewer',
		[-1, -1],
		[-1, -1],
		wxMINIMIZE_BOX | wxSYSTEM_MENU | wxCAPTION | wxCLOSE_BOX | wxCLIP_CHILDREN
	);

	$frame->Show (1);
	$self->SetTopWindow ($frame);

	return 1;
}

package ImagePanel;

use base qw (Wx::Panel);
use fields qw (memdc);
use Wx qw (wxCOPY);
use Wx::Event qw (EVT_PAINT);

sub new {
	my $class = shift;
	my $self  = $class->SUPER::new (@_);

	$self->{memdc} = Wx::MemoryDC->new ();

	EVT_PAINT($self, \&OnPaint);

	return $self;
}

sub clear {
	my $self = shift;

	$self->{memdc}->Clear ();
	$self->Refresh ();
}

sub load {
	my ($self, $filename) = @_;

	my $file = IO::File->new ($filename, 'r');
	binmode $file;
	my $handler = Wx::PNGHandler->new ();
	my $image = Wx::Image->new ();
	my $bitmap;
	$handler->LoadFile ($image, $file);
	$bitmap = Wx::Bitmap->new ($image);

	if ($bitmap->Ok ()) {
		$self->{memdc}->SelectObject ($bitmap);
		$self->Refresh ();
	}
}

sub load_gd {
	my ($self, $gd) = @_;
	my $png = $gd->png;

	open my $fh, '<', \$png or die ("Cannot create PNG file for viewing.\n");
	my $handler = Wx::PNGHandler->new ();
	my $image = Wx::Image->new ();
	my $bitmap;
	$handler->LoadFile ($image, $fh);
	close $fh or die ("Cannot properly close output file.\n");
	$bitmap = Wx::Bitmap->new ($image);

	if ($bitmap->Ok ()) {
		$self->{memdc}->SelectObject ($bitmap);
		$self->Refresh ();
	}
}

sub OnPaint {
	my ($self, $event) = @_;
	my $size = $self->GetClientSize ();

	my $dcPaint = Wx::PaintDC->new ($self);
	$dcPaint->Blit (0, 0, $size->x, $size->y, $self->{memdc}, 0, 0, wxCOPY, 0);
}

package UnifontViewerFrame;

use base qw (Wx::Frame);
use fields qw (filename hexlist charheight listbox imagepanel);
use Wx::Event qw (EVT_MENU EVT_LISTBOX);
use Wx qw (wxBORDER_SIMPLE wxID_OPEN wxID_SAVE wxID_EXIT wxID_OK wxHORIZONTAL wxEXPAND wxALL wxLB_SORT wxFD_OPEN wxFD_SAVE wxFD_FILE_MUST_EXIST wxFD_CHANGE_DIR);

our @id = (0 .. 100);

sub new {
	my $class = shift;
	my $self  = $class->SUPER::new (@_);
	$self->{filename} = '';
	$self->{charheight} = 16;

	my $boxsizer = Wx::BoxSizer->new (wxHORIZONTAL);

	$self->{listbox} = Wx::ListBox->new (
		$self,
		-1,
		[-1, -1],
		[64, -1],
		[],
		wxLB_SORT
	);

	$self->{imagepanel} = ImagePanel->new (
		$self,
		-1,
		[-1, -1],
		[-1, -1],
		wxBORDER_SIMPLE
	);

	SetCharHeight ($self, $self->{charheight});

	$boxsizer->Add (
		$self->{listbox},
		0,
		wxEXPAND | wxALL,
		0
	);

	$boxsizer->Add (
		$self->{imagepanel},
		0,
		wxALL,
		1
	);

	EVT_LISTBOX ($self->{listbox}, -1, sub {
		my $selection = $self->{listbox}->GetStringSelection ();
		SetPage ($self, $selection);
	});

	my $menubar = Wx::MenuBar->new ();
	my $menu = Wx::Menu->new ();

	$menu->Append (wxID_OPEN, "O&pen...\tCtrl+O");
	$menu->Append (wxID_SAVE, "S&ave As...\tCtrl+S");
	$menu->AppendSeparator ();
	$menu->AppendRadioItem ($id[0], "Glyph Height 16");
	$menu->AppendRadioItem ($id[1], "Glyph Height 24");
	$menu->AppendRadioItem ($id[2], "Glyph Height 32");
	$menu->AppendSeparator ();
	$menu->Append (wxID_EXIT, "E&xit\tCtrl+X");
	$menubar->Append ($menu, 'File');

	$self->SetMenuBar ($menubar);

	EVT_MENU ($self, wxID_OPEN, \&OpenFile);
	EVT_MENU ($self, wxID_SAVE, \&SaveFile);
	EVT_MENU ($self, $id[0], sub {SetCharHeight ($self, 16)});
	EVT_MENU ($self, $id[1], sub {SetCharHeight ($self, 24)});
	EVT_MENU ($self, $id[2], sub {SetCharHeight ($self, 32)});
	EVT_MENU ($self, wxID_EXIT, sub {$_[0]->Close (1)});

	$self->SetSizerAndFit ($boxsizer);

	return $self;
}

sub OpenFile {
	my ($self, $event) = @_;

	my $dlg = Wx::FileDialog->new (
		$self,
		'Open File',
		'',
		'',
		'Hex files (*.hex)|*.hex',
		wxFD_OPEN | wxFD_FILE_MUST_EXIST | wxFD_CHANGE_DIR
	);

	if ($dlg->ShowModal == wxID_OK) {
		$self->{imagepanel}->clear ();

		my %pages = ();

		$self->{filename} = $dlg->GetPath ();
		$self->SetTitle ("Unifont Viewer - " . $dlg->GetFilename ());

		open HEXFILE, "<$self->{filename}" || die "Cannot open $self->{filename}.\n";

		while (<HEXFILE>) {
			chomp;
			my ($codepoint, $char) = (split (':', $_));
			# For now, list page numbers as 4 digits even for Plane 0 for sorting
			if (length ($codepoint) == 4) {
				$codepoint = "00" . $codepoint;
			}

			if ($codepoint and $codepoint =~ m/^[0-9A-F]{4,6}$/) {
				if (!($char eq '00542A542A542A542A542A542A542A00' || $char eq 'FFB9C5EDD5D5D5D5D5D5D5D5EDB991FF')) {
					my $page = substr ($codepoint, 0, -2);
					$pages{$page} = 1;
				}
			}
		}

		$self->{listbox}->Clear ();
		for (keys %pages) {
			$self->{listbox}->Append ($_, hex ($_));
		}

		my %hexlist = Unifont::LoadHexFile ($self->{filename});
		$self->{hexlist} = \%hexlist;

		$self->{listbox}->Select (0);
		my $selection = $self->{listbox}->GetStringSelection ();
		SetPage ($self, $selection);
	};
}

sub SaveFile {
	my ($self, $event) = @_;

	my $selection = $self->{listbox}->GetStringSelection ();

	if ($selection) {
		my $dlg = Wx::FileDialog->new (
			$self,
			'Save File',
			'',
			"$selection.png",
			'PNG files (*.png)|*.png',
			wxFD_SAVE
		);

		if ($dlg->ShowModal == wxID_OK) {
			my $im = Unifont::Hex2PNG ($self->{hexlist}, hex ($selection), $self->{charheight});

			my $filename = $dlg->GetPath ();

			$self->{imagepanel}->load_gd ($im);

			open (PICTURE, ">$filename") or die ("Cannot save image.\n");
			binmode PICTURE;
			print PICTURE $im->png or die;
			close PICTURE or die ("Cannot properly close output file.\n");
		}
	}
}

sub SetPage {
	my ($self, $selection) = @_;

	if ($selection) {
		my $im = Unifont::Hex2PNG ($self->{hexlist}, hex ($selection), $self->{charheight});
		$self->{imagepanel}->load_gd ($im);
	} else {
		$self->{imagepanel}->clear ();
	}
}

sub SetCharHeight {
	my ($self, $charheight) = @_;
	my ($x, $y);
	my $selection = $self->{listbox}->GetStringSelection ();

	$self->{charheight} = $charheight;

	if ($charheight == 16 || $charheight == 24) {
		$x = 562;
		$y = 544;
	} elsif ($charheight == 32) {
		$x = 688;
		$y = 672;
	}

	$self->{imagepanel}->SetMinSize ([-1, -1]);
	$self->{imagepanel}->SetClientSize ($x, $y);
	$self->{imagepanel}->SetMinSize ($self->{imagepanel}->GetSize ());
	$self->Fit ();

	SetPage ($self, $selection);
}

package main;

my ($app) = UnifontViewer->new ();

$app->MainLoop ();