#include <prjxray/xilinx/xcuseries/part.h>

#include <iomanip>
#include <sstream>

namespace prjxray {
namespace xilinx {
namespace xcuseries {

absl::optional<Part> Part::FromFile(const std::string& path) {
	try {
		YAML::Node yaml = YAML::LoadFile(path);
		return yaml.as<Part>();
	} catch (YAML::Exception& e) {
		return {};
	}
}

bool Part::IsValidFrameAddress(FrameAddress address) const {
	auto addr_row = rows_.find(address.row());
	if (addr_row == rows_.end())
		return false;
	return addr_row->second.IsValidFrameAddress(address);
}

absl::optional<FrameAddress> Part::GetNextFrameAddress(
    FrameAddress address) const {
	// Find the row for the current address.
	auto addr_row = rows_.find(address.row());

	// If the current address isn't in a known row, no way to know the next.
	if (addr_row == rows_.end())
		return {};

	// Ask the row for the next address.
	absl::optional<FrameAddress> next_address =
	    addr_row->second.GetNextFrameAddress(address);
	if (next_address)
		return next_address;

	// The current row doesn't know what the next address is.  Assume that
	// the next valid address is the beginning of the next row.
	if (++addr_row != rows_.end()) {
		auto next_address = FrameAddress(address.block_type(), addr_row->first, 0, 0);
		if (addr_row->second.IsValidFrameAddress(next_address))
			return next_address;
	}

	// Block types are next numerically.
	if (address.block_type() < BlockType::BLOCK_RAM) {
		next_address =
		    FrameAddress(BlockType::BLOCK_RAM, 0, 0, 0);
		if (IsValidFrameAddress(*next_address))
			return next_address;
	}

	if (address.block_type() < BlockType::CFG_CLB) {
		next_address = FrameAddress(BlockType::CFG_CLB, 0, 0, 0);
		if (IsValidFrameAddress(*next_address))
			return next_address;
	}

	return {};
}

}  // namespace xcuseries
}  // namespace xilinx
}  // namespace prjxray

namespace xcuseries = prjxray::xilinx::xcuseries;

namespace YAML {

Node convert<xcuseries::Part>::encode(const xcuseries::Part& rhs) {
	Node node;
	node.SetTag("xilinx/xcuseries/part");

	std::ostringstream idcode_str;
	idcode_str << "0x" << std::hex << rhs.idcode_;
	node["idcode"] = idcode_str.str();
	node["rows"] = rhs.rows_;
	return node;
}

bool convert<xcuseries::Part>::decode(const Node& node, xcuseries::Part& lhs) {
	if (!node.Tag().empty() && node.Tag() != "xilinx/xcuseries/part")
		return false;

	if (!node["global_clock_regions"] && !node["configuration_ranges"]) {
		return false;
	}

	lhs.idcode_ = node["idcode"].as<uint32_t>();
	if (node["rows"]) {
		lhs.rows_ = node["rows"].as<std::map<unsigned int, xcuseries::Row>>();
	} else if (node["configuration_ranges"]) {
		std::vector<xcuseries::FrameAddress> addresses;
		for (auto range : node["configuration_ranges"]) {
			auto begin =
			    range["begin"].as<xcuseries::FrameAddress>();
			auto end = range["end"].as<xcuseries::FrameAddress>();
			for (uint32_t cur = begin; cur < end; ++cur) {
				addresses.push_back(cur);
			}
		}

		lhs = xcuseries::Part(lhs.idcode_, addresses);
	}

	return true;
};

}  // namespace YAML