#include "devices/storage/storage_management.hpp"

#include "kapi/boot_modules.hpp"
#include "kapi/system.hpp"

#include "devices/device.hpp"
#include "devices/storage/ram_disk/ram_disk_controller.hpp"
#include "devices/storage/storage_controller.hpp"

#include <algorithm>
#include <cstddef>
#include <optional>

namespace devices::storage
{
  namespace
  {
    constexpr size_t static MINORS_PER_DEVICE = 16;
    constexpr size_t static START_MAJOR = 1;
    constinit size_t static next_free_major = START_MAJOR;

    constinit auto static active_storage_management = std::optional<storage_management>{};
    // TODO BA-FS26 remove again, when dynamic memory available
    constinit auto static active_ram_disk_controller = std::optional<ram_disk::ram_disk_controller>{};
  }  // namespace

  auto storage_management::init() -> void
  {
    if (active_storage_management)
    {
      kapi::system::panic("[DEVICES] Storage management has already been initialized.");
    }
    active_storage_management.emplace(storage_management{});

    active_ram_disk_controller.emplace(&kapi::boot_modules::get_boot_module_registry());
    active_storage_management->add_controller(&active_ram_disk_controller.value());

    std::ranges::for_each(active_storage_management->m_controllers, [](auto controller) { controller->probe(); });
  }

  auto storage_management::get() -> storage_management &
  {
    if (!active_storage_management)
    {
      kapi::system::panic("[DEVICES] Storage management has not been initialized.");
    }

    return *active_storage_management;
  }

  auto storage_management::add_controller(storage_controller * controller) -> void
  {
    controller->set_ids(next_free_major++, MINORS_PER_DEVICE);
    m_controllers.at(0) = controller;  // TODO BA-FS26 use push_back from kstd:vector
  }

  auto storage_management::device_by_major_minor(size_t major, size_t minor) -> device *
  {
    device * found = nullptr;

    std::ranges::find_if(m_controllers, [&](auto const controller) {
      if (controller != nullptr && controller->major() == major)
      {
        found = controller->device_by_minor(minor);
        return found != nullptr;
      }
      return false;
    });

    return found;
  }

  auto storage_management::determine_boot_device() -> device *
  {
    return device_by_major_minor(START_MAJOR, 0);
  }

}  // namespace devices::storage