#include "CheckStorageThread.h"
#include "Constant.h"
#include "DatabaseManager.h"
#include "Log.h"
#include "Tool.h"
#include <QFile>
#include <QMutex>
#include <QWaitCondition>

// 磁盘剩余最小容量
#define THRESHOLD 10 * 1024 * 1024
// 检查间隔
#define INTERVAL 10 * 60 * 1000

extern QString curFilename;
extern QMutex mutex;
extern QWaitCondition condition;
extern DatabaseManager* db;

CheckStorageThread::CheckStorageThread(QObject* parent)
    : QThread(parent)
{
}

/**
 * @brief 10分钟检查一次外接硬盘的可用空间
 */
void CheckStorageThread::run()
{
    while (true) {
        int64_t available = Tool::getAvailableStorage(Constant::MountedPath);
        if (available < THRESHOLD) {
            Log::info("there are not enough storage, then remove some files...");
            emit diskWillFull();
            // 从数据库中取出前两条数据，找到相关的文件删除
            QList<DatabaseManager::File> fileList = db->getTopTwo();
            for (auto& file : fileList) {
                QString filename = file.filename;
                QString channel = file.channel == DatabaseManager::MainChannel
                    ? Constant::MainChannel
                    : Constant::SecondaryChannel;
                // 判断文件是否再回放，如果在回放就阻塞等待
                mutex.lock();
                if (filename == curFilename) {
                    Log::info("{} is playing, wait for play end and remove the files...", filename.toStdString());
                    condition.wait(&mutex);
                    Log::info("check thread end wait...");
                }
                mutex.unlock();
                // 删除文件
                QString path = QString("%1/%2/%3").arg(Constant::VideoPath).arg(channel).arg(filename);
                bool ret = Tool::removeFile(path);
                if (!ret) {
                    Log::error("remove file {} failed", path.toStdString());
                } else {
                    Log::info("remove file {} success", path.toStdString());
                }
                // 从数据库清除这条记录
                db->remove(file.channel, file.filename);
            }
        } else {
            emit diskNotFull();
        }
        QThread::msleep(INTERVAL);
    }
}