#ifndef LYRIC_PARSER_H
#define LYRIC_PARSER_H

#include <string>
#include <map>

typedef struct LyricPacket
{
    // 歌词
    std::string lyric;
    // ms时间戳
    int64_t pts = 0;

    bool isEmpty() const { return lyric.empty() && pts == 0; }
} LyricPacket;

class LrcParser
{
public:
    LrcParser() {};
    ~LrcParser() {};
    bool parseLrc(const std::string &lrcFile);
    LyricPacket readPacket();
    int64_t duration() const;
    
    /**
     * @brief 利用给定的时间戳来寻求一个最接近的位置
     * @param[in] timestamp 时间戳,单位ms
     * @return 成功返回true,否则返回false
     */
    bool seek(int64_t timestamp);
private:
    int64_t duration_ = 0;
    size_t currentIndex_ = 0;
    std::string lrcData_;
    std::map<int64_t, std::string> lyrics_;
    std::map<int64_t, std::string>::iterator readIndex_;
    size_t parseHeader();
    void parseLine(const std::string &line);
    std::string readLine();
};

#endif // LRCDECODER_H