use v5.36;
use rlib '.';

use HexGrid;
use HexGrid::Pin;
use MWTemplate;
use MediaWiki::API;

use Getopt::Long;
use Carp;

use Data::Dumper;
# $Data::Dumper::Indent = 1;

use feature "signatures";
no warnings "experimental::signatures";

# This regex is a whitespace forgiving version of /^(-?\d+),(-?\d+)/, an int pair
my $coords_regex = qr/^\s*(\s*-?\d+\s*)\s*,\s*(\s*-?\d+\s*)\s*$/;


my $api_url;
my $region_template_name = "MapRegion";
my $subregion_template_name = "MapSubregion";
my $location_template_name = "MapLocation";
my $site_template_name = "MapSite";
my $path_template_name = "MapPath";

my $border_width = 1;
my $border_colour = 'black';
my $default_path_stroke_width = 5;
my $show_coords = 0;
my $embed_images = 1;

my $html_document = 1;
my $outfile = '-';
my $regiondir;

GetOptions
(
	'api-url=s' => \$api_url,
	'region-template-name=s' => \$region_template_name,
	'subregion-template-name=s' => \$subregion_template_name,
	'location-template-name=s' => \$location_template_name,
	'site-template-name=s' => \$site_template_name,
	'path-template-name=s' => \$path_template_name,

	'border-width|bw=f' => \$border_width,
	'border-colour|border-color|bc=s' => \$border_colour,
	'show-coords|coords!' => \$show_coords,
	'embed-images!' => \$embed_images,

	'html-document!' => \$html_document,
	'outfile=s' => \$outfile,
	'regiondir=s' => \$regiondir
);

# HexGrid::DEBUG();

$api_url // croak "Base API URL is required! Use --api-url to set";

my $grid = HexGrid->new(embed_images => $embed_images, defaults => {
		style => { 'stroke-width' => $border_width, stroke => $border_colour },
		show_coords => $show_coords});

# Used in producing region subgrids, maps each subregion to its parent region
my %regions_by_subregion;
my %images_for_region_grids;
my %location_grids;

my $mw = MediaWiki::API->new();
$mw->{config}->{api_url} = $api_url;



say STDERR "Getting Region pages";
my $region_query_results = $mw->api
( {
	action => 'query',
	generator => 'categorymembers',
	gcmtitle => 'Category:Regions',
	gcmlimit => 'max',
	prop => 'info|revisions',
	rvprop => 'content',
	inprop => 'url',
} ) || croak $mw->{error}->{code} . ': ' . $mw->{error}->{details};

my (@tile_pages, %background_pages);
foreach my $page (values %{$region_query_results->{query}{pages}})
{
	next if $page->{title} =~ /^Category:/;
	my $parsed_template = MWTemplate::Parse($page->{revisions}[0]{'*'}, $region_template_name);
	next unless $parsed_template;
	say STDERR "Processing region: $page->{title}";
	my $region = $grid->make_region($page->{title});
	$region->{defaults}{colour} = $parsed_template->{named_params}{colour};
	$region->{defaults}{coords_colour} = $parsed_template->{named_params}{coordinates_colour}
		if $parsed_template->{named_params}{coordinates_colour};
	if($regiondir)
	{
		$regions_by_subregion{$region->{name}} = $region->{name};
	}

	push @tile_pages, "$page->{title}/Tiles";
	push @{$background_pages{"File:$parsed_template->{named_params}{background}"}}, $region;
}



say STDERR "Getting Subregion pages";
my $subregion_query_results = $mw->api
( {
	action => 'query',
	generator => 'categorymembers',
	gcmtitle => 'Category:Subregions',
	gcmlimit => 'max',
	prop => 'info|revisions',
	rvprop => 'content',
	inprop => 'url',
} ) || croak $mw->{error}->{code} . ': ' . $mw->{error}->{details};

foreach my $page (values %{$subregion_query_results->{query}{pages}})
{
	next if $page->{title} =~ /^Category:/;
	my $parsed_template = MWTemplate::Parse($page->{revisions}[0]{'*'}, $subregion_template_name);
	next unless $parsed_template;
	say STDERR "Processing subregion: $page->{title}";
	my $subregion = $grid->make_region($page->{title});
	$subregion->{defaults}{colour} = $parsed_template->{named_params}{colour};
	$subregion->{defaults}{coords_colour} = $parsed_template->{named_params}{coordinates_colour}
		if $parsed_template->{named_params}{coordinates_colour};
	if($regiondir)
	{
		my $region_name = $parsed_template->{positional_params}[0];
		$regions_by_subregion{$subregion->{name}} = $region_name;
	}

	push @tile_pages, "$page->{title}/Tiles";
	push @{$background_pages{"File:$parsed_template->{named_params}{background}"}}, $subregion;
}



my @location_continuations;
say STDERR "Getting Location pages";
my $location_query_results = $mw->api
( {
	action => 'query',
	generator => 'categorymembers',
	gcmtitle => 'Category:Locations',
	gcmlimit => 'max',
	prop => 'info|revisions',
	rvprop => 'content',
	inprop => 'url',
} ) || croak $mw->{error}->{code} . ': ' . $mw->{error}->{details};

foreach my $page (values %{$location_query_results->{query}{pages}})
{
	next if $page->{title} =~ /^Category:/;
	my $parsed_template = MWTemplate::Parse($page->{revisions}[0]{'*'}, $location_template_name);
	next unless $parsed_template;

	say STDERR "Processing location: $page->{title}";

	my $location = $grid->make_region($page->{title});
	$location->{defaults}{colour} = $parsed_template->{named_params}{colour};
	$location->{defaults}{coords_colour} = $parsed_template->{named_params}{coordinates_colour}
		if $parsed_template->{named_params}{coordinates_colour};
	push @{$background_pages{"File:$parsed_template->{named_params}{background}"}}, $location;
	my $region_name = $parsed_template->{positional_params}[1];
	$regions_by_subregion{$location->{name}} = $region_name;

	next unless $parsed_template->{positional_params}[0] =~ $coords_regex;
	my ($nw, $sw) = ($1, $2);

	push @location_continuations, sub
	{
		# We create the tile after the location region has its image set, which happens later
		$location->make_tile_at($nw, $sw);
		if($regiondir)
		{
			# Locations can have their own images rendered, given a list of context tiles
			# To reference these tiles, they must exist in the parent grid,
			# so the remainder of the processing must happen after the region tile pages are processed
			my @coords_list = ({ nw => $nw, sw => $sw});
			foreach my $coords (split /;/, $parsed_template->{named_params}{context_tiles})
			{
				do { carp "Skipping bad spec: $coords"; next; } unless $coords =~ $coords_regex;
				push @coords_list, { nw => $1, sw => $2 };
			}
			my $location_grid = $grid->subgrid_for_tiles(@coords_list);
			$location_grid->iter_tile(
				sub($tile)
				{
					# if haven't added image to grid yet, do so
					if($tile->image && !(exists $location_grid->{images}{$tile->image}))
					{
						$location_grid->{images}{$tile->image} = $grid->{images}{$tile->image};
					}
				});
			$location_grids{$location->{name}} = $location_grid;
		}
	};
}



# To minimize API calls, and since some images may be referenced by more than one region,
# all background images for all regions are put in one request.
# The list of pages to get was constructed in the region, subregion, and location processing.

say STDERR "Getting Background image pages";
my $background_query_results = $mw->api({ action => 'query',
		prop => 'imageinfo',
		titles => join('|', keys %background_pages),
		iiprop => 'url'
	}) || carp $mw->{error}->{code} . ': ' . $mw->{error}->{details};

foreach my $page (values %{$background_query_results->{query}{pages}})
{
	if($page->{imageinfo})
	{
		say STDERR "Processing image: $page->{title}";
		$grid->add_image(HexGrid::to_id($page->{title}), $page->{imageinfo}[0]{url});
		# For every region which declared this image its background
		foreach my $subregion (@{$background_pages{$page->{title}}})
		{
			$subregion->{defaults}{image} = HexGrid::to_id($page->{title});
			if($regiondir)
			{
				# If we make subgrids for the regions, we'll need to add this image to the region's subgrid
				my $region_name = $regions_by_subregion{$subregion->{name}};
				push @{$images_for_region_grids{$region_name}},
				{
					name => HexGrid::to_id($page->{title}),
					source => $page->{imageinfo}[0]{url}
				};
			}
		}
	}
}


# As above, get all tile pages in one request.
# By doing so, we lose context as to which page corresponds to which region,
# so we extract it from the title of the page.

say STDERR "Getting Tile pages";
my $tile_query_results = $mw->api
( {
	action => 'query',
	titles => join('|', @tile_pages),
	prop => 'revisions',
	rvprop => 'content',
} ) || croak $mw->{error}->{code} . ': ' . $mw->{error}->{details};

foreach my $page (values %{$tile_query_results->{query}{pages}})
{
	my $content = $page->{revisions}[0]{'*'};
	my ($region_name) = $page->{title} =~ /(.*)\/Tiles/;
	say STDERR "Processing tiles for: $region_name";
	my $region = $grid->{regions}{$region_name};
	foreach my $coords (split /;/, $content)
	{
		do { carp "Skipping bad spec: $coords"; next; } unless $coords =~ $coords_regex;
		$region->make_tile_at($1,$2);
	}
}



say STDERR "Continuing Location processing";
$_->() for @location_continuations;



my (%path_specs);
say STDERR "Getting Path pages";
my $path_query_results = $mw->api
( {
	action => 'query',
	generator => 'categorymembers',
	prop => 'info|revisions',
	gcmtitle => 'Category:Paths',
	gcmlimit => 'max',
	rvprop => 'content',
	inprop => 'url',
} ) || croak $mw->{error}->{code} . ': ' . $mw->{error}->{details};

foreach my $path_page_ref (values %{$path_query_results->{query}{pages}})
{
	next if $path_page_ref->{title} =~ /^Category:/;
	my $path_name = $path_page_ref->{title};

	say STDERR "Processing Path $path_name";

	my $path_content = $path_page_ref->{revisions}[0]{'*'};
	my $parsed_template = MWTemplate::Parse($path_content, $path_template_name);
	next unless $parsed_template;

	$path_specs{$path_name} =
	{
		id => HexGrid::to_id($path_name) . "-path",
		tile_page => "$path_name/Tiles",
		colour => $parsed_template->{named_params}{colour},
		stroke_width => $parsed_template->{named_params}{stroke_width}
	};
	$path_specs{$path_name}{starts_from} = $parsed_template->{named_params}{starts_from}
		if $parsed_template->{named_params}{starts_from};
	$path_specs{$path_name}{ends_to} = $parsed_template->{named_params}{ends_to}
		if $parsed_template->{named_params}{ends_to};
}


say STDERR "Getting Path Tile pages";
my $path_tile_query_results = $mw->api
( {
	action => 'query',
	titles => join('|', map { $_->{tile_page} } values %path_specs),
	prop => 'revisions',
	rvprop => 'content',
} ) || croak $mw->{error}->{code} . ': ' . $mw->{error}->{details};

foreach my $page (values %{$path_tile_query_results->{query}{pages}})
{
	my $content = $page->{revisions}[0]{'*'};
	my ($path_name) = $page->{title} =~ /(.*)\/Tiles/;
	say STDERR "Processing tiles for: $path_name";
	my %path_spec = %{$path_specs{$path_name}};
	my @path_coords;
	foreach my $coords (split /;/, $content)
	{
		do { carp "Skipping bad spec: $coords"; next; } unless $coords =~ $coords_regex;
		push @path_coords, [$1,$2];
	}
	my $path = $grid->make_path_from($path_spec{id}, \@path_coords, css_class => 'path',
		colour => $path_spec{colour},
		style => { 'stroke-width' => $path_spec{stroke_width} // $default_path_stroke_width });
	$path->{starts_from} = $HexGrid::DIR{$path_spec{starts_from}} if $path_spec{starts_from};
	$path->{ends_to} = $HexGrid::DIR{$path_spec{ends_to}} if $path_spec{ends_to};
}


say STDERR "Getting Site pages";
my $site_query_results = $mw->api
( {
	action => 'query',
	generator => 'categorymembers',
	prop => 'info|revisions',
	gcmtitle => 'Category:Sites',
	gcmlimit => 'max',
	rvprop => 'content',
	inprop => 'url',
} ) || croak $mw->{error}->{code} . ': ' . $mw->{error}->{details};

my %site_icon_pages;
foreach my $site_page_ref (values %{$site_query_results->{query}{pages}})
{
	next if $site_page_ref->{title} =~ /^Category:/;
	my $site_name = $site_page_ref->{title};

	say STDERR "Processing Site $site_name";

	my $site_url = $site_page_ref->{canonicalurl};
	my $site_content = $site_page_ref->{revisions}[0]{'*'};
	my $parsed_template = MWTemplate::Parse($site_content, $site_template_name);
	next unless $parsed_template;
	my ($nw,$sw) = split /,/, $parsed_template->{named_params}{coords};
	my $tile = $grid->get_tile_at($nw, $sw);
	unless($tile)
	{
		carp "Coordinates of Site $site_name do not appear in the grid, skipping.";
		next;
	}

	$site_icon_pages{"File:$parsed_template->{named_params}{icon}"} =
		$parsed_template->{named_params}{icon};

	my $pin = HexGrid::Pin->new
	(
		name => $site_name,
		id => HexGrid::to_id($site_name),
		icon => HexGrid::to_id($parsed_template->{named_params}{icon}),
		link => $site_url,
		description => $parsed_template->{named_params}{abstract},
		popup => $html_document
	);
	$tile->pin($pin);
}

say STDERR "Getting Site icon image pages";
my $site_icon_query_results = $mw->api({ action => 'query',
		prop => 'imageinfo',
		titles => join('|', keys %site_icon_pages),
		iiprop => 'url'
	}) || carp $mw->{error}->{code} . ': ' . $mw->{error}->{details};

foreach my $page (values %{$site_icon_query_results->{query}{pages}})
{
	if($page->{imageinfo})
	{
		say STDERR "Processing image: $page->{title}";
		$grid->add_image
		(
			HexGrid::to_id($site_icon_pages{$page->{title}}),
			$page->{imageinfo}[0]{url}
		);
	}
}

# Render and output
open (my $fh, "> $outfile") or croak "Couldn't open $outfile for writing: $!";
say $fh ($html_document ? wrap_in_html($grid) : $grid->render);
close $fh;

if($regiondir)
{
	chdir $regiondir || croak "Couldn't chdir to $regiondir: $!";
	my $extension = $html_document ? 'html' : 'svg';
	my %region_grid_listings; # Maps a region name to the list of its subregions (including itself)
	while(my ($subregion, $region) = each %regions_by_subregion)
	{
		push @{$region_grid_listings{$region}}, $subregion;
	}
	while(my ($region, $subregions) = each %region_grid_listings)
	{
		my $region_grid = $grid->subgrid_for_regions(@$subregions);
		if(exists $images_for_region_grids{$region})
		{
			foreach my $image (@{$images_for_region_grids{$region}})
			{
				$region_grid->{images}{$image->{name}} = $grid->{images}{$image->{name}};
			}
		}

		say STDERR "Rendering Region $region\'s grid";
		open (my $region_fh, "> $region.$extension")
			or croak "Couldn't open $region.extension for writing: $!";
		say $region_fh ($html_document ? wrap_in_html($region_grid) : $region_grid->render);
		close $region_fh;
	}
	# TODO: Location grids need to import images
	while(my ($location_name, $location_grid) = each %location_grids)
	{
		say STDERR "Rendering Location $location_name\'s grid";
		open (my $location_fh, "> $location_name.$extension")
			or croak "Couldn't open $location_name.$extension for writing: $!";
		say $location_fh ($html_document ? wrap_in_html($location_grid) : $location_grid->render);
		close $location_fh;
	}
}


# Puts the rendered SVG inside an html document,
# along with a bit of javascript to show popups for sites and to toggle coordinates visibility
sub wrap_in_html($grid)
{
	my $html_builder = "<!DOCTYPE html>";
	$html_builder .= "\n<html>\n<body>";
	$html_builder .= "\n" . <<EOS;
<script>
	function clickPin(pinId, containerId) {
		let popup = document.getElementById(pinId + '-popup');
		popup.style.visibility = popup.style.visibility == 'visible' ? 'hidden' : 'visible';
	}
</script>
EOS
	if($show_coords)
	{
		$html_builder .= <<EOS;
<script>
	function toggleCoords(show) {
		for (var elem of document.getElementsByClassName('coords')) {
			elem.style.visibility = show ? 'visible' : 'hidden';
		}
	}
</script>
	<label for="show-coords-checkbox">Show coordinates</label>
	<input type="checkbox" checked id="show-coords-checkbox" onclick="toggleCoords(event.srcElement.checked)" />
EOS
	}
	$html_builder .= "\n" . $grid->render;
	$html_builder .= "\n</body>\n</html>";
	return $html_builder;
}