#include <iostream>

#include <gflags/gflags.h>
#include <prjxray/memory_mapped_file.h>
#include <prjxray/xilinx/architectures.h>
#include <prjxray/xilinx/bitstream_reader.h>
#include <prjxray/xilinx/bitstream_writer.h>
#include <prjxray/xilinx/configuration.h>

DEFINE_string(part_name, "", "");
DEFINE_string(part_file, "", "Definition file for target 7-series part");
DEFINE_string(bitstream_file,
              "",
              "Initial bitstream to which the deltas are applied.");
DEFINE_string(
    frm_file,
    "",
    "File containing a list of frame deltas to be applied to the base "
    "bitstream.  Each line in the file is of the form: "
    "<frame_address> <word1>,...,<word101>.");
DEFINE_string(output_file, "", "Write patched bitsteam to file");
DEFINE_string(architecture,
              "Series7",
              "Architecture of the provided bitstream");

namespace xilinx = prjxray::xilinx;

template <typename ArchType>
int patch_frames(
    const std::string& frm_file_str,
    std::map<typename ArchType::FrameAddress, std::vector<uint32_t>>* frames) {
	xilinx::Frames<ArchType> frames_from_file;
	if (frames_from_file.readFrames(frm_file_str)) {
		std::cerr << "Failed to read frames" << std::endl;
		return 1;
	}

	// Apply the deltas.
	for (auto& frame : frames_from_file.getFrames()) {
		auto iter = frames->find(frame.first);
		if (iter == frames->end()) {
			std::cerr << "frame address 0x" << std::hex
			          << static_cast<uint32_t>(frame.first)
			          << " because it was not found in frames."
			          << std::endl;
			return 1;
		}

		auto& frame_data = iter->second;
		frame_data = frame.second;
	}

	return 0;
}

struct BitstreamPatcher {
	template <typename T>
	int operator()(T& arg) {
		using ArchType = std::decay_t<decltype(arg)>;
		auto part = ArchType::Part::FromFile(FLAGS_part_file);
		if (!part) {
			std::cerr << "Part file not found or invalid"
			          << std::endl;
			return 1;
		}

		auto bitstream_file = prjxray::MemoryMappedFile::InitWithFile(
		    FLAGS_bitstream_file);
		if (!bitstream_file) {
			std::cerr << "Can't open base bitstream file: "
			          << FLAGS_bitstream_file << std::endl;
			return 1;
		}

		auto bitstream_reader =
		    xilinx::BitstreamReader<ArchType>::InitWithBytes(
		        bitstream_file->as_bytes());
		if (!bitstream_reader) {
			std::cout << "Bitstream does not appear to be a "
			             "7-series bitstream!"
			          << std::endl;
			return 1;
		}

		auto bitstream_config =
		    xilinx::Configuration<ArchType>::InitWithPackets(
		        *part, *bitstream_reader);
		if (!bitstream_config) {
			std::cerr
			    << "Bitstream does not appear to be for this part"
			    << std::endl;
			return 1;
		}

		// Copy the base frames to a mutable collection
		std::map<typename ArchType::FrameAddress, std::vector<uint32_t>>
		    frames;
		for (auto& frame_val : bitstream_config->frames()) {
			auto& cur_frame = frames[frame_val.first];

			std::copy(frame_val.second.begin(),
			          frame_val.second.end(),
			          std::back_inserter(cur_frame));
		}

		if (!FLAGS_frm_file.empty()) {
			int ret =
			    patch_frames<ArchType>(FLAGS_frm_file, &frames);
			if (ret != 0) {
				return ret;
			}
		}

		// Create data for the type 2 configuration packet with
		// information about all frames
		typename xilinx::Configuration<ArchType>::PacketData
		    configuration_packet_data(
		        xilinx::Configuration<ArchType>::
		            createType2ConfigurationPacketData(frames, part));

		// Put together a configuration package
		typename ArchType::ConfigurationPackage configuration_package;
		xilinx::Configuration<ArchType>::createConfigurationPackage(
		    configuration_package, configuration_packet_data, part);

		// Write bitstream.
		auto bitstream_writer =
		    xilinx::BitstreamWriter<ArchType>(configuration_package);
		if (bitstream_writer.writeBitstream(
		        configuration_package, FLAGS_part_name, FLAGS_frm_file,
		        "xc7patch", FLAGS_output_file)) {
			std::cerr << "Failed to write bitstream" << std::endl
			          << "Exitting" << std::endl;
		}
		return 0;
	}
};

int main(int argc, char* argv[]) {
	gflags::SetUsageMessage(argv[0]);
	gflags::ParseCommandLineFlags(&argc, &argv, true);
	xilinx::Architecture::Container arch_container =
	    xilinx::ArchitectureFactory::create_architecture(
	        FLAGS_architecture);
	return absl::visit(BitstreamPatcher(), arch_container);
}