#include "kernel/acpi/manager.hpp"

#include "kapi/acpi.hpp"
#include "kapi/memory.hpp"
#include "kapi/system.hpp"

#include <cstddef>

namespace kernel::acpi
{

  manager::manager(kapi::acpi::root_system_description_pointer const & sdp)
      : m_sdp{&sdp}
  {
    if (m_sdp->signature() != "RSD PTR ")
    {
      kapi::system::panic("[OS:ACPI] Invalid RSDP signature!");
    }

    if (m_sdp->revision() >= 2)
    {
      auto const xsdp = static_cast<kapi::acpi::extended_system_description_pointer const *>(m_sdp);
      if (!xsdp->validate())
      {
        kapi::system::panic("[OS:ACPI] Invalid XSDP signature!");
      }
      auto physical_extended_table_address = xsdp->table_address();
      auto linear_extended_table_address = kapi::memory::hhdm_to_linear(physical_extended_table_address);
      m_rsdt = static_cast<kapi::acpi::system_description_table_header const *>(linear_extended_table_address);
      m_extended = true;
    }
    else
    {
      if (!m_sdp->validate())
      {
        kapi::system::panic("[OS:ACPI] Invalid RSDP checksum!");
      }
      auto physical_root_table_address = m_sdp->table_address();
      auto linear_root_table_address = kapi::memory::hhdm_to_linear(physical_root_table_address);
      m_rsdt = static_cast<kapi::acpi::system_description_table_header const *>(linear_root_table_address);
    }
  }

  auto manager::load_tables() -> bool
  {
    if (!kapi::acpi::validate_checksum({reinterpret_cast<std::byte const *>(m_rsdt), m_rsdt->length}))
    {
      kapi::system::panic("[OS:ACPI] Invalid RSDT checksum!");
    }

    return false;
  }

}  // namespace kernel::acpi