#include "kapi/interrupts.hpp"

#include <kstd/print>
#include <kstd/vector>

#include <array>
#include <cstdint>

namespace kapi::interrupts
{

  namespace
  {
    auto constinit handlers = std::array<kstd::vector<handler *>, 256>{};
  }  // namespace

  auto register_handler(std::uint32_t irq_number, handler & handler) -> void
  {
    auto & handler_list = handlers.at(irq_number);
    handler_list.push_back(&handler);
  }

  auto unregister_handler(std::uint32_t irq_number, handler & handler) -> void
  {
    static_cast<void>(irq_number);
    static_cast<void>(handler);
    kstd::println("[OS:interrupts] TODO: support erasure from vector.");
  }

  auto dispatch(std::uint32_t irq_number) -> status
  {
    auto & handler_list = handlers.at(irq_number);

    if (handler_list.empty())
    {
      kstd::println(kstd::print_sink::stderr, "[OS:interrupts] No handler for IRQ{}", irq_number);
      return status::unhandled;
    }

    for (auto handler : handler_list)
    {
      if (handler && handler->handle_interrupt(irq_number) == status::handled)
      {
        return status::handled;
      }
    }

    return status::unhandled;
  }

}  // namespace kapi::interrupts