//
// Created by misaki on 2025/9/15.
//
#pragma once
#include <functional>
#include <vector>
#include <string>
#include <mutex>
#include <atomic>
#include "esp_afe_sr_iface.h"
#include "model_path.h"
#include "esp_mn_iface.h"
#include "driver/i2s_std.h"
#include "esp_log.h"
#include "ThreadManager.h"

// 前向声明
struct model_iface_data_t;

// 语音命令回调函数类型
using SpeechCommandCallback = std::function<void(int command_id, const std::string& phrase, float probability)>;

// 识别状态回调函数类型
using SpeechStateCallback = std::function<void(const std::string& state)>;

// 识别结果结构体
struct SpeechRecognitionResult {
    int command_id;
    std::string phrase;
    float probability;
    int phrase_id;
};

// 配置结构体
struct SpeechRecognizerConfig {
    // I2S配置
    gpio_num_t bclk_pin = GPIO_NUM_15;
    gpio_num_t ws_pin = GPIO_NUM_2;
    gpio_num_t din_pin = GPIO_NUM_39;

    // 音频处理配置
    bool enable_aec = false;      // 回声消除
    bool enable_se = false;       // 降噪
    bool enable_vad = false;       // 语音活动检测
    vad_mode_t vad_mode = VAD_MODE_0; // VAD灵敏度
    // 模型路径
    std::string model_path = "/sdcard/srmodels";
    // 线程配置
    ThreadConfig feed_thread_config = {"SR_Feed", 1, 4096, 3, false};
    ThreadConfig detect_thread_config = {"SR_Detect", 0, 6 * 1024, 5, false};
    // 识别超时时间(ms)
    int detection_timeout = 6000;
};

class SpeechRecognizer {
public:
    // 获取单例实例
    static SpeechRecognizer* getInstance();

    // 删除拷贝构造函数和赋值运算符
    SpeechRecognizer(const SpeechRecognizer&) = delete;
    SpeechRecognizer& operator=(const SpeechRecognizer&) = delete;

    // 初始化语音识别系统
    bool init(const SpeechRecognizerConfig& config = SpeechRecognizerConfig());
    // 重载版本
    bool init(const bool enable_vad, const vad_mode_t vad_mode, std::string model_path);
    // 反初始化
    void deinit();

    // 添加自定义语音命令
    bool addCommand(int command_id, const std::string& phrase);

    // 批量添加语音命令
    bool addCommands(const std::vector<std::pair<int, std::string>>& commands);

    // 清除所有语音命令
    void clearCommands();

    // 开始语音识别
    bool start();

    // 停止语音识别
    void stop();

    // 是否正在运行
    bool isRunning() const;

    // 注册命令回调函数
    void registerCommandCallback(SpeechCommandCallback callback);

    // 注册状态回调函数
    void registerStateCallback(SpeechStateCallback callback);

    // 获取最后一次识别结果
    SpeechRecognitionResult getLastResult() const;

    // 获取识别历史
    std::vector<SpeechRecognitionResult> getHistory() const;

    // 设置VAD灵敏度
    // void setVadSensitivity(vad_mode_t mode);

    // 启用/禁用语音识别
    void setEnabled(bool enabled);

    // 获取当前识别状态
    std::string getCurrentState() const;

    // 获取当前 VAD 识别状态(噪音、静音 or 人声) 需要开启 VAD
    afe_vad_state_t getVadState() const;
private:
    SpeechRecognizer();
    ~SpeechRecognizer();

    // I2S初始化
    bool initI2S();

    // ESP-SR初始化
    bool initESP_SR();

    // 喂数据任务（音频采集）
    void feedTask();

    // 检测任务（语音识别）
    void detectTask();

    // 处理识别结果
    void handleRecognitionResult(const SpeechRecognitionResult& result);

    // 更新识别状态
    void updateState(const std::string& state);

    // 静态成员函数用于C接口兼容
    static void feedTaskWrapper(void* arg);
    static void detectTaskWrapper(void* arg);

private:
    static SpeechRecognizer* instance;
    static std::mutex instanceMutex;

    SpeechRecognizerConfig config;
    bool initialized;
    bool running;
    bool enabled;

    // I2S相关
    i2s_chan_handle_t rx_handle;

    // ESP-SR相关
    const esp_afe_sr_iface_t* afe_handle;
    esp_afe_sr_data_t* afe_data;
    srmodel_list_t* models;
    esp_mn_iface_t* multinet;
    model_iface_data_t* model_data;         /// 模型数据
    afe_vad_state_t vad_state_;             /// 语音活动检测状态

    // 命令回调
    SpeechCommandCallback commandCallback;
    SpeechStateCallback stateCallback;

    // 识别结果
    SpeechRecognitionResult lastResult;
    std::vector<SpeechRecognitionResult> history;
    mutable std::mutex historyMutex;

    // 任务句柄
    std::thread feedThread;
    std::thread detectThread;
    std::atomic<bool> tasksRunning;

    // 当前状态
    std::string currentState;
    mutable std::mutex stateMutex;
};