#include "kapi/devices.hpp"

#include "kapi/acpi.hpp"
#include "kapi/boot.hpp"

#include "arch/boot/boot.hpp"
#include "arch/bus/isa.hpp"
#include "arch/devices/legacy_pit.hpp"

#include <kstd/memory>
#include <kstd/print>

#include <cstdint>
#include <utility>

namespace kapi::devices
{

  namespace
  {
    constexpr auto pit_frequency_in_hz = std::uint32_t{100u};
  }

  auto init_platform_devices() -> void
  {
    auto const & mbi = boot::bootstrap_information.mbi;
    auto system_description_pointer = static_cast<acpi::root_system_description_pointer const *>(nullptr);

    if (auto const & xsdp = mbi->maybe_acpi_xsdp())
    {
      auto data = xsdp->pointer().data();
      system_description_pointer = reinterpret_cast<kapi::acpi::root_system_description_pointer const *>(data);
    }
    else if (auto const & rsdp = mbi->maybe_acpi_rsdp())
    {
      auto data = rsdp->pointer().data();
      system_description_pointer = reinterpret_cast<kapi::acpi::root_system_description_pointer const *>(data);
    }

    if (system_description_pointer)
    {
      if (!kapi::acpi::init(*system_description_pointer))
      {
        kstd::println(kstd::print_sink::stderr, "[x86_64:DEV] ACPI initialization failed. No tables loaded.");
      }
    }
    else
    {
      kstd::println(kstd::print_sink::stderr, "[x86_64:DEV] No ACPI RSDP found. Most devices will not be available.");
    }

    kstd::println("[x86_64:DEV] Initializing ISA bus...");

    auto isa_major_number = kapi::devices::allocate_major_number();
    auto isa_bus = kstd::make_unique<arch::bus::isa>(isa_major_number);

    auto pit_major_number = kapi::devices::allocate_major_number();
    auto pit = kstd::make_unique<arch::devices::legacy_pit>(pit_major_number, pit_frequency_in_hz);
    isa_bus->add_child(std::move(pit));

    auto & root_bus = get_root_bus();
    root_bus.add_child(std::move(isa_bus));
  }

}  // namespace kapi::devices