/**
 * ReXGlue native filesystem layer
 * Part of the AC6 Recompilation project
 */

#pragma once

#include <filesystem>
#include <memory>
#include <string>
#include <vector>

#include <native/filesystem.h>
#include <native/filesystem/wildcard.h>
#include <rex/memory/mapped_memory.h>
#include <rex/string/buffer.h>
#include <rex/system/xtypes.h>
#include <rex/thread/mutex.h>

namespace rex::system {
class KernelState;
class XFile;
}  // namespace rex::system

namespace rex::filesystem {

class Device;
class File;

// Matches https://source.winehq.org/source/include/winternl.h#1591.
enum class FileAction {
  kSuperseded = 0,
  kOpened = 1,
  kCreated = 2,
  kOverwritten = 3,
  kExists = 4,
  kDoesNotExist = 5,
};

enum class FileDisposition {
  // If exist replace, else create.
  kSuperscede = 0,
  // If exist open, else error.
  kOpen = 1,
  // If exist error, else create.
  kCreate = 2,
  // If exist open, else create.
  kOpenIf = 3,
  // If exist open and overwrite, else error.
  kOverwrite = 4,
  // If exist open and overwrite, else create.
  kOverwriteIf = 5,
};

// Reuse rex::filesystem definition.
using FileAccess = rex::filesystem::FileAccess;

enum FileAttributeFlags : uint32_t {
  kFileAttributeNone = 0x0000,
  kFileAttributeReadOnly = 0x0001,
  kFileAttributeHidden = 0x0002,
  kFileAttributeSystem = 0x0004,
  kFileAttributeDirectory = 0x0010,
  kFileAttributeArchive = 0x0020,
  kFileAttributeDevice = 0x0040,
  kFileAttributeNormal = 0x0080,
  kFileAttributeTemporary = 0x0100,
  kFileAttributeCompressed = 0x0800,
  kFileAttributeEncrypted = 0x4000,
};

class Entry {
 public:
  virtual ~Entry();

  void Dump(rex::string::StringBuffer* string_buffer, int indent);

  Device* device() const { return device_; }
  Entry* parent() const { return parent_; }
  const std::string& path() const { return path_; }
  const std::string& absolute_path() const { return absolute_path_; }
  const std::string& name() const { return name_; }
  uint32_t attributes() const { return attributes_; }
  size_t size() const { return size_; }
  size_t allocation_size() const { return allocation_size_; }
  uint64_t create_timestamp() const { return create_timestamp_; }
  uint64_t access_timestamp() const { return access_timestamp_; }
  uint64_t write_timestamp() const { return write_timestamp_; }
  bool delete_on_close() const { return delete_on_close_; }

  virtual bool SetAttributes([[maybe_unused]] uint64_t attributes) { return false; }
  virtual bool SetCreateTimestamp([[maybe_unused]] uint64_t timestamp) { return false; }
  virtual bool SetAccessTimestamp([[maybe_unused]] uint64_t timestamp) { return false; }
  virtual bool SetWriteTimestamp([[maybe_unused]] uint64_t timestamp) { return false; }
  void SetForDeletion(bool delete_on_close) { delete_on_close_ = delete_on_close; }

  bool is_read_only() const;

  Entry* GetChild(const std::string_view name);
  Entry* ResolvePath(const std::string_view path);

  const std::vector<std::unique_ptr<Entry>>& children() const { return children_; }
  size_t child_count() const { return children_.size(); }
  Entry* IterateChildren(const rex::filesystem::WildcardEngine& engine, size_t* current_index);

  Entry* CreateEntry(const std::string_view name, uint32_t attributes);
  bool Delete(Entry* entry);
  bool Delete();
  virtual bool Truncate() { return false; }
  void Rename(const std::filesystem::path& file_path);
  void Touch();

  // If successful, out_file points to a new file. When finished, call
  // file->Destroy()
  virtual X_STATUS Open(uint32_t desired_access, File** out_file) = 0;

  virtual bool can_map() const { return false; }
  virtual std::unique_ptr<memory::MappedMemory> OpenMapped(memory::MappedMemory::Mode mode,
                                                           size_t offset = 0, size_t length = 0) {
    (void)mode;
    (void)offset;
    (void)length;
    return nullptr;
  }
  virtual void update() { return; }

 protected:
  Entry(Device* device, Entry* parent, const std::string_view path);

  virtual std::unique_ptr<Entry> CreateEntryInternal(const std::string_view name,
                                                     uint32_t attributes) {
    (void)name;
    (void)attributes;
    return nullptr;
  }
  virtual bool DeleteEntryInternal(Entry* entry) {
    (void)entry;
    return false;
  }
  virtual void RenameEntryInternal(const std::vector<std::string_view>& path_parts) {
    (void)path_parts;
  }

  rex::thread::global_critical_region global_critical_region_;
  Device* device_;
  Entry* parent_;
  std::string path_;
  std::string absolute_path_;
  std::string name_;
  uint32_t attributes_;  // FileAttributeFlags
  size_t size_;
  size_t allocation_size_;
  uint64_t create_timestamp_;
  uint64_t access_timestamp_;
  uint64_t write_timestamp_;
  std::vector<std::unique_ptr<Entry>> children_;
  bool delete_on_close_ = false;
};

}  // namespace rex::filesystem