#pragma once

#include "character/CharacterActionLibrary.h"

namespace frostbite2D {

class CharacterObject;

/// 角色主状态机。输入先变成意图，再由状态机决定当前大状态和动作推进。
class CharacterStateMachine {
public:
  void Reset();
  void Update(CharacterObject& owner,
              CharacterCommandBuffer& commandBuffer,
              const CharacterIntent& intent,
              float deltaTime);
  void ForceHurt(const CharacterActionDefinition* hurtAction);

  CharacterStateId GetState() const { return currentState_; }
  const std::string& GetCurrentActionId() const { return currentActionId_; }
  const CharacterActionDefinition* GetCurrentActionDefinition() const {
    return currentAction_;
  }

  bool CanAcceptGroundActions() const;
  bool CanBeInterrupted() const;
  bool IsMovementLocked() const;
  bool CanTurn() const;

private:
  void ChangeState(CharacterObject& owner, CharacterStateId nextState);
  void EnterAction(CharacterObject& owner, const CharacterActionDefinition* action);
  void UpdateGroundState(CharacterObject& owner,
                         CharacterCommandBuffer& commandBuffer,
                         const CharacterIntent& intent);
  void UpdateAirState(CharacterObject& owner,
                      CharacterCommandBuffer& commandBuffer,
                      const CharacterIntent& intent);
  void UpdateActionState(CharacterObject& owner,
                         CharacterCommandBuffer& commandBuffer,
                         const CharacterIntent& intent,
                         float deltaTime);
  void UpdateHurtState(CharacterObject& owner, float deltaTime);
  bool TryStartAction(CharacterObject& owner,
                      CharacterCommandBuffer& commandBuffer,
                      CharacterCommandType commandType,
                      const std::string& actionId);
  void ApplyFrameEvents(CharacterObject& owner, int previousFrame, int currentFrame);

  CharacterStateId currentState_ = CharacterStateId::Idle;
  std::string currentActionId_;
  const CharacterActionDefinition* currentAction_ = nullptr;
  float stateTime_ = 0.0f;
  float actionFrameProgress_ = 0.0f;
  int actionFrame_ = 0;
  float landingTimer_ = 0.0f;
};

} // namespace frostbite2D