package com.afe.dc.tranlog.service;

import com.afe.dc.tranlog.domain.dto.BuySellStrength;
import com.afe.dc.tranlog.domain.model.entity.TranRecord;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * 买卖强度逻辑服务
 * 对应C++的CBuySellStrengthLogic类
 * 负责计算买卖强度（高/中/低）
 * @author ben.yang
 */
@Slf4j
@Service
public class BuySellStrengthService {
    
    /**
     * 是否已更新
     */
    private Boolean updated = false;
    
    /**
     * 买入成交量
     */
    private Double buyVolume = 0.0;
    
    /**
     * 卖出成交量
     */
    private Double sellVolume = 0.0;
    
    /**
     * 中性成交量
     */
    private Double neutralVolume = 0.0;
    
    /**
     * 读写锁
     */
    private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    
    /**
     * 是否启用
     */
    public static boolean enabled = true;
    
    /**
     * 更新买卖强度数据
     * 对应C++的internalUpdate方法
     */
    public void update(TranRecord record) {
        if (!enabled) {
            return;
        }
        
        lock.writeLock().lock();
        try {
            if (!isInterestedFlag(record)) {
                return;
            }
            
            Double volume = record.getVolume() != null ? record.getVolume() : 0.0;
            Byte flag = record.getFlag();
            
            // 根据flag判断买卖方向
            if (record.isAsk()) {
                // 卖盘
                sellVolume += volume;
            } else if (record.isBid()) {
                // 买盘
                buyVolume += volume;
            } else {
                // 中性
                neutralVolume += volume;
            }
            
            updated = true;
            
        } finally {
            lock.writeLock().unlock();
        }
    }
    
    /**
     * 获取买卖强度数据
     */
    public BuySellStrength getData() {
        lock.readLock().lock();
        try {
            // 计算买卖强度
            // 这里简化处理，实际应该根据价格-成交量分布来计算
            Float high = calculateHigh();
            Float mid = calculateMid();
            Float low = calculateLow();
            
            return BuySellStrength.builder()
                    .high(high)
                    .mid(mid)
                    .low(low)
                    .build();
        } finally {
            lock.readLock().unlock();
        }
    }
    
    /**
     * 清空数据
     */
    public void drop() {
        lock.writeLock().lock();
        try {
            buyVolume = 0.0;
            sellVolume = 0.0;
            neutralVolume = 0.0;
            updated = false;
        } finally {
            lock.writeLock().unlock();
        }
    }
    
    /**
     * 判断是否为感兴趣的标志
     */
    private boolean isInterestedFlag(TranRecord record) {
        Byte flag = record.getFlag();
        return flag != null && (flag == ' ' || flag == 'A' || flag == 'B' || flag == 'Y' || flag == 'U');
    }
    
    /**
     * 计算高强度
     */
    private Float calculateHigh() {
        // 简化计算，实际应该根据业务逻辑
        double total = buyVolume + sellVolume + neutralVolume;
        if (total == 0) {
            return 0.0f;
        }
        return (float) (buyVolume / total * 100);
    }
    
    /**
     * 计算中强度
     */
    private Float calculateMid() {
        // 简化计算
        double total = buyVolume + sellVolume + neutralVolume;
        if (total == 0) {
            return 0.0f;
        }
        return (float) (neutralVolume / total * 100);
    }
    
    /**
     * 计算低强度
     */
    private Float calculateLow() {
        // 简化计算
        double total = buyVolume + sellVolume + neutralVolume;
        if (total == 0) {
            return 0.0f;
        }
        return (float) (sellVolume / total * 100);
    }
}