package com.vincent.rsf.server.manager.service.impl;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.time.Duration;
import java.util.Arrays;
import java.util.List;

@Slf4j
@Service
@RequiredArgsConstructor
public class WmsRedisLuaService {

    private static final DefaultRedisScript<Long> LOCATION_CLAIM_SCRIPT = createScript("wms-lua/location-claim.lua");
    private static final DefaultRedisScript<Long> STATION_CLAIM_SCRIPT = createScript("wms-lua/station-claim.lua");
    private static final DefaultRedisScript<Long> INVENTORY_RESERVE_SCRIPT = createScript("wms-lua/inventory-reserve.lua");

    private final StringRedisTemplate redisTemplate;

    public boolean claimLocation(String occupyKey, String occupyValue, Duration ttl) {
        Long result = redisTemplate.execute(
                LOCATION_CLAIM_SCRIPT,
                List.of(occupyKey),
                occupyValue,
                String.valueOf(ttl.toMillis())
        );
        return result != null && result > 0;
    }

    public boolean claimStation(String stationKey, String taskValue, Duration ttl) {
        Long result = redisTemplate.execute(
                STATION_CLAIM_SCRIPT,
                List.of(stationKey),
                taskValue,
                String.valueOf(ttl.toMillis())
        );
        return result != null && result > 0;
    }

    public boolean reserveInventory(String inventoryKey, String orderKey, BigDecimal initialAvailable, BigDecimal reserveQuantity, Duration ttl) {
        Long result = redisTemplate.execute(
                INVENTORY_RESERVE_SCRIPT,
                List.of(inventoryKey, orderKey),
                initialAvailable.toPlainString(),
                reserveQuantity.toPlainString(),
                String.valueOf(ttl.toMillis())
        );
        return result != null && result > 0;
    }

    public void releaseKeys(String... keys) {
        if (keys == null || keys.length == 0) {
            return;
        }
        try {
            redisTemplate.delete(Arrays.asList(keys));
        } catch (Exception ex) {
            log.warn("Release redis keys failed", ex);
        }
    }

    public void resetInventoryCache(String inventoryKey, BigDecimal availableQuantity, Duration ttl) {
        redisTemplate.opsForValue().set(inventoryKey, availableQuantity.toPlainString(), ttl);
    }

    private static DefaultRedisScript<Long> createScript(String path) {
        DefaultRedisScript<Long> script = new DefaultRedisScript<>();
        script.setLocation(new ClassPathResource(path));
        script.setResultType(Long.class);
        return script;
    }
}