#include <mbgl/renderer/layers/render_fill_extrusion_layer.hpp>
#include <mbgl/renderer/buckets/fill_extrusion_bucket.hpp>
#include <mbgl/renderer/render_tile.hpp>
#include <mbgl/renderer/paint_parameters.hpp>
#include <mbgl/renderer/image_manager.hpp>
#include <mbgl/renderer/render_static_data.hpp>
#include <mbgl/renderer/renderer_backend.hpp>
#include <mbgl/programs/programs.hpp>
#include <mbgl/programs/fill_extrusion_program.hpp>
#include <mbgl/tile/tile.hpp>
#include <mbgl/style/layers/fill_extrusion_layer_impl.hpp>
#include <mbgl/geometry/feature_index.hpp>
#include <mbgl/util/math.hpp>
#include <mbgl/util/intersection_tests.hpp>

namespace mbgl {

using namespace style;

RenderFillExtrusionLayer::RenderFillExtrusionLayer(Immutable<style::FillExtrusionLayer::Impl> _impl)
    : RenderLayer(style::LayerType::FillExtrusion, _impl),
      unevaluated(impl().paint.untransitioned()) {
}

const style::FillExtrusionLayer::Impl& RenderFillExtrusionLayer::impl() const {
    return static_cast<const style::FillExtrusionLayer::Impl&>(*baseImpl);
}

std::unique_ptr<Bucket> RenderFillExtrusionLayer::createBucket(const BucketParameters& parameters, const std::vector<const RenderLayer*>& layers) const {
    return std::make_unique<FillExtrusionBucket>(parameters, layers);
}

void RenderFillExtrusionLayer::transition(const TransitionParameters& parameters) {
    unevaluated = impl().paint.transitioned(parameters, std::move(unevaluated));
}

void RenderFillExtrusionLayer::evaluate(const PropertyEvaluationParameters& parameters) {
    evaluated = unevaluated.evaluate(parameters);

    passes = (evaluated.get<style::FillExtrusionOpacity>() > 0) ? RenderPass::Translucent
                                                         : RenderPass::None;
}

bool RenderFillExtrusionLayer::hasTransition() const {
    return unevaluated.hasTransition();
}

void RenderFillExtrusionLayer::render(PaintParameters& parameters, RenderSource*) {
    if (parameters.pass == RenderPass::Opaque) {
        return;
    }

    const auto size = parameters.context.viewport.getCurrentValue().size;

    if (!parameters.staticData.extrusionTexture || parameters.staticData.extrusionTexture->getSize() != size) {
        parameters.staticData.extrusionTexture = OffscreenTexture(parameters.context, size, OffscreenTextureAttachment::Depth);
    }

    parameters.staticData.extrusionTexture->bind();

    parameters.context.setStencilMode(gl::StencilMode::disabled());
    parameters.context.setDepthMode(parameters.depthModeForSublayer(0, gl::DepthMode::ReadWrite));
    parameters.context.clear(Color{ 0.0f, 0.0f, 0.0f, 0.0f }, 1.0f, {});

    if (evaluated.get<FillExtrusionPattern>().from.empty()) {
        for (const RenderTile& tile : renderTiles) {
            assert(dynamic_cast<FillExtrusionBucket*>(tile.tile.getBucket(*baseImpl)));
            FillExtrusionBucket& bucket = *reinterpret_cast<FillExtrusionBucket*>(tile.tile.getBucket(*baseImpl));

            parameters.programs.fillExtrusion.get(evaluated).draw(
                parameters.context,
                gl::Triangles(),
                parameters.depthModeForSublayer(0, gl::DepthMode::ReadWrite),
                gl::StencilMode::disabled(),
                parameters.colorModeForRenderPass(),
                FillExtrusionUniforms::values(
                    tile.translatedClipMatrix(evaluated.get<FillExtrusionTranslate>(),
                                              evaluated.get<FillExtrusionTranslateAnchor>(),
                                              parameters.state),
                    parameters.state,
                    parameters.evaluatedLight
                ),
                *bucket.vertexBuffer,
                *bucket.indexBuffer,
                bucket.triangleSegments,
                bucket.paintPropertyBinders.at(getID()),
                evaluated,
                parameters.state.getZoom(),
                getID());
        }
    } else {
        optional<ImagePosition> imagePosA = parameters.imageManager.getPattern(evaluated.get<FillExtrusionPattern>().from);
        optional<ImagePosition> imagePosB = parameters.imageManager.getPattern(evaluated.get<FillExtrusionPattern>().to);

        if (!imagePosA || !imagePosB) {
            return;
        }

        parameters.imageManager.bind(parameters.context, 0);

        for (const RenderTile& tile : renderTiles) {
            assert(dynamic_cast<FillExtrusionBucket*>(tile.tile.getBucket(*baseImpl)));
            FillExtrusionBucket& bucket = *reinterpret_cast<FillExtrusionBucket*>(tile.tile.getBucket(*baseImpl));

            parameters.programs.fillExtrusionPattern.get(evaluated).draw(
                parameters.context,
                gl::Triangles(),
                parameters.depthModeForSublayer(0, gl::DepthMode::ReadWrite),
                gl::StencilMode::disabled(),
                parameters.colorModeForRenderPass(),
                FillExtrusionPatternUniforms::values(
                    tile.translatedClipMatrix(evaluated.get<FillExtrusionTranslate>(),
                                              evaluated.get<FillExtrusionTranslateAnchor>(),
                                              parameters.state),
                    parameters.imageManager.getPixelSize(),
                    *imagePosA,
                    *imagePosB,
                    evaluated.get<FillExtrusionPattern>(),
                    tile.id,
                    parameters.state,
                    -std::pow(2, tile.id.canonical.z) / util::tileSize / 8.0f,
                    parameters.evaluatedLight
                ),
                *bucket.vertexBuffer,
                *bucket.indexBuffer,
                bucket.triangleSegments,
                bucket.paintPropertyBinders.at(getID()),
                evaluated,
                parameters.state.getZoom(),
                getID());
        }
    }

    parameters.backend.bind();
    parameters.context.bindTexture(parameters.staticData.extrusionTexture->getTexture());

    mat4 viewportMat;
    matrix::ortho(viewportMat, 0, size.width, size.height, 0, 0, 1);

    const Properties<>::PossiblyEvaluated properties;

    parameters.programs.extrusionTexture.draw(
        parameters.context,
        gl::Triangles(),
        gl::DepthMode::disabled(),
        gl::StencilMode::disabled(),
        parameters.colorModeForRenderPass(),
        ExtrusionTextureProgram::UniformValues{
            uniforms::u_matrix::Value{ viewportMat }, uniforms::u_world::Value{ size },
            uniforms::u_image::Value{ 0 },
            uniforms::u_opacity::Value{ evaluated.get<FillExtrusionOpacity>() }
        },
        parameters.staticData.extrusionTextureVertexBuffer,
        parameters.staticData.quadTriangleIndexBuffer,
        parameters.staticData.extrusionTextureSegments,
        ExtrusionTextureProgram::PaintPropertyBinders{ properties, 0 },
        properties,
        parameters.state.getZoom(),
        getID());
}

bool RenderFillExtrusionLayer::queryIntersectsFeature(
        const GeometryCoordinates& queryGeometry,
        const GeometryTileFeature& feature,
        const float,
        const float bearing,
        const float pixelsToTileUnits) const {

    auto translatedQueryGeometry = FeatureIndex::translateQueryGeometry(
            queryGeometry,
            evaluated.get<style::FillExtrusionTranslate>(),
            evaluated.get<style::FillExtrusionTranslateAnchor>(),
            bearing,
            pixelsToTileUnits);

    return util::polygonIntersectsMultiPolygon(translatedQueryGeometry.value_or(queryGeometry), feature.getGeometries());
}

} // namespace mbgl