/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2015 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

#if defined(HAVE_CAIRO)

// mapnik
#include <mapnik/feature.hpp>
#include <mapnik/proj_transform.hpp>
#include <mapnik/cairo/cairo_renderer.hpp>
#include <mapnik/cairo/cairo_render_vector.hpp>
#include <mapnik/renderer_common/render_pattern.hpp>
#include <mapnik/vertex_converters.hpp>
#include <mapnik/vertex_processor.hpp>
#include <mapnik/marker.hpp>
#include <mapnik/marker_cache.hpp>
#include <mapnik/agg_rasterizer.hpp>
#include <mapnik/renderer_common/clipping_extent.hpp>
#include <mapnik/renderer_common/apply_vertex_converter.hpp>
#include <mapnik/renderer_common/pattern_alignment.hpp>

namespace mapnik
{

struct cairo_renderer_process_visitor_p
{
    cairo_renderer_process_visitor_p(cairo_context & context,
                                   agg::trans_affine & image_tr,
                                   unsigned offset_x,
                                   unsigned offset_y,
                                   float opacity)
        : context_(context),
          image_tr_(image_tr),
          offset_x_(offset_x),
          offset_y_(offset_y),
          opacity_(opacity) {}

    void operator() (marker_null const&) {}

    void operator() (marker_svg const& marker)
    {
        mapnik::rasterizer ras;
        mapnik::box2d<double> const& bbox_image = marker.get_data()->bounding_box() * image_tr_;
        mapnik::image_rgba8 image(bbox_image.width(), bbox_image.height());
        render_pattern<image_rgba8>(ras, marker, image_tr_, 1.0, image);
        cairo_pattern pattern(image, opacity_);
        pattern.set_extend(CAIRO_EXTEND_REPEAT);
        pattern.set_origin(offset_x_, offset_y_);
        context_.set_pattern(pattern);
    }

    void operator() (marker_rgba8 const& marker)
    {
        cairo_pattern pattern(marker.get_data(), opacity_);
        pattern.set_extend(CAIRO_EXTEND_REPEAT);
        pattern.set_origin(offset_x_, offset_y_);
        context_.set_pattern(pattern);
    }

  private:
    cairo_context & context_;
    agg::trans_affine & image_tr_;
    unsigned offset_x_;
    unsigned offset_y_;
    float opacity_;
};

template <typename T>
void cairo_renderer<T>::process(polygon_pattern_symbolizer const& sym,
                                  mapnik::feature_impl & feature,
                                  proj_transform const& prj_trans)
{
    composite_mode_e comp_op = get<composite_mode_e, keys::comp_op>(sym, feature, common_.vars_);
    std::string filename = get<std::string, keys::file>(sym, feature, common_.vars_);
    value_bool clip = get<value_bool, keys::clip>(sym, feature, common_.vars_);
    value_double simplify_tolerance = get<value_double, keys::simplify_tolerance>(sym, feature, common_.vars_);
    value_double smooth = get<value_double, keys::smooth>(sym, feature, common_.vars_);
    value_double opacity = get<value_double, keys::opacity>(sym, feature, common_.vars_);
    agg::trans_affine image_tr = agg::trans_affine_scaling(common_.scale_factor_);
    auto image_transform = get_optional<transform_type>(sym, keys::image_transform);
    if (image_transform) evaluate_transform(image_tr, feature, common_.vars_, *image_transform, common_.scale_factor_);

    cairo_save_restore guard(context_);
    context_.set_operator(comp_op);

    std::shared_ptr<mapnik::marker const> marker = mapnik::marker_cache::instance().find(filename,true);
    if (marker->is<mapnik::marker_null>()) return;

    unsigned offset_x=0;
    unsigned offset_y=0;
    box2d<double> const& clip_box = clipping_extent(common_);
    pattern_alignment_enum alignment = get<pattern_alignment_enum, keys::alignment>(sym, feature, common_.vars_);
    if (alignment == LOCAL_ALIGNMENT)
    {
        double x0 = 0.0;
        double y0 = 0.0;
        using apply_local_alignment = detail::apply_local_alignment;
        apply_local_alignment apply(common_.t_, prj_trans, clip_box, x0, y0);
        util::apply_visitor(geometry::vertex_processor<apply_local_alignment>(apply), feature.get_geometry());
        offset_x = std::abs(clip_box.width() - x0);
        offset_y = std::abs(clip_box.height() - y0);
    }

    util::apply_visitor(cairo_renderer_process_visitor_p(context_, image_tr, offset_x, offset_y, opacity), *marker);

    agg::trans_affine tr;
    auto geom_transform = get_optional<transform_type>(sym, keys::geometry_transform);
    if (geom_transform) { evaluate_transform(tr, feature, common_.vars_, *geom_transform, common_.scale_factor_); }
    using vertex_converter_type = vertex_converter<clip_poly_tag,
                                                   transform_tag,
                                                   affine_transform_tag,
                                                   simplify_tag,
                                                   smooth_tag>;

    vertex_converter_type converter(clip_box,sym,common_.t_,prj_trans,tr,feature,common_.vars_,common_.scale_factor_);
    if (prj_trans.equal() && clip) converter.set<clip_poly_tag>();
    converter.set<transform_tag>(); //always transform
    converter.set<affine_transform_tag>();
    if (simplify_tolerance > 0.0) converter.set<simplify_tag>(); // optional simplify converter
    if (smooth > 0.0) converter.set<smooth_tag>(); // optional smooth converter

    using apply_vertex_converter_type = detail::apply_vertex_converter<vertex_converter_type, cairo_context>;
    using vertex_processor_type = geometry::vertex_processor<apply_vertex_converter_type>;
    apply_vertex_converter_type apply(converter, context_);
    mapnik::util::apply_visitor(vertex_processor_type(apply),feature.get_geometry());
    // fill polygon
    context_.set_fill_rule(CAIRO_FILL_RULE_EVEN_ODD);
    context_.fill();
}

template void cairo_renderer<cairo_ptr>::process(polygon_pattern_symbolizer const&,
                                                 mapnik::feature_impl &,
                                                 proj_transform const&);

}

#endif // HAVE_CAIRO
