android_multiviewwer/app/src/main/cpp/Renderer.h

#pragma once

#include "AnimationStrategy.h"
#include "TransitionStrategy.h"
#include "Preloader.h"
#include <string>
#include <sstream>
#include <iomanip>
#include <chrono>
#include <mutex>
#include <random>
#include <memory> // for std::unique_ptr
#include <android/native_window.h>
#include <android/native_window_jni.h>

class Renderer {
public:
    // 사용자가 설정할 수 있는 애니메이션 모드 종류
    enum class AnimationMode {
        PAN = 0,
        ZOOM = 1,
        NONE = 2,
        RANDOM = 3,
        PAN_ONE_WAY = 4,
        PAGE_TURN = 5
    };

    // 사용자가 설정할 수 있는 전환 효과 종류
    enum class TransitionMode {
        FADE = 0,
        SLIDE = 1,
        RANDOM = 2,
        MOSAIC = 3
    };

    Renderer();
    ~Renderer();

    // --- Public API ---
    void setNextMedia(int fd);
    void renderFrame(ANativeWindow* window);
    void release();
    std::string getDebugInfo() const;

    // --- 설정(Settings)을 위한 함수들 ---
    void setAnimationSpeed(float speed);
    void setAnimationMode(int mode);
    void setFadeDuration(int durationMs);
    void setPageTurnDelay(int delayMs);
    void setTransitionMode(int mode);

    // --- 전략(Strategy) 객체들이 호출하는 헬퍼 함수들 ---
    void drawMedia(ANativeWindow_Buffer& buffer, MediaAsset& media, float alpha, float finalOffsetX, float finalOffsetY, float finalScale);
    void renderVideoFrame(MediaAsset& media, ANativeWindow_Buffer& buffer, float scale, float offsetX, float offsetY, float alpha);
    void renderImageFrame(const MediaAsset& media, ANativeWindow_Buffer& buffer, float scale, float offsetX, float offsetY, float alpha);
    void calculateFitScaleAndOffset(const MediaAsset& media, int surfaceWidth, int surfaceHeight,
                                    float& outScale, float& outOffsetX, float& outOffsetY) const;

private:
    // --- 상태 머신(State Machine) ---
    enum class RenderState {
        ANIMATING,
        TRANSITIONING
    };
    RenderState currentState_ = RenderState::ANIMATING;

    // --- 상태별 처리를 위한 private 핸들러 함수 ---
    void handleAnimationState(ANativeWindow_Buffer& buffer, int surfaceWidth, int surfaceHeight);
    void handleTransitionState(ANativeWindow_Buffer& buffer, int surfaceWidth, int surfaceHeight);

    // --- 멤버 객체들 ---
    std::mutex renderMutex_;
    Preloader preloader_;
    MediaAsset currentMedia_;
    MediaAsset nextMedia_;
    std::unique_ptr<AnimationStrategy> animationStrategy_;
    std::unique_ptr<TransitionStrategy> transitionStrategy_;

    // --- 설정값 저장 변수 ---
    AnimationMode configuredAnimationMode_ = AnimationMode::PAN;
    TransitionMode configuredTransitionMode_ = TransitionMode::FADE;
    AnimationMode activeAnimationMode_ = AnimationMode::PAN;
    long long fadeDurationMs_ = 3000;
    long long pageTurnDelayMs_ = 5000;
    float animationSpeed_ = 1.0f;

    // --- 상태(State) 관리 변수 ---
    std::chrono::steady_clock::time_point transitionStartTime_;

    // --- 랜덤 기능 ---
    std::mt19937 randomEngine_;

    // --- private 헬퍼 함수 ---
    void determineActiveAnimationMode();
};