<?php

namespace app\common\library;

class LotteryGiftLua
{
    // 获取Lua脚本
    public static function getLotteryLuaScript()
    {
        return <<<LUA
-- 接收参数：send_uid, recv_uid, gift_gold, small_trigger_times, big_threshold, small_round, big_round, big_total_gold
local send_uid = ARGV[1]
local recv_uid = ARGV[2]
local gift_gold = tonumber(ARGV[3])
local small_trigger_times = tonumber(ARGV[4])
local big_threshold = tonumber(ARGV[5])
local small_round = tonumber(ARGV[6]) -- 小奖池当前轮次
local big_round = tonumber(ARGV[7])   -- 大奖池当前轮次
local big_total_gold = tonumber(ARGV[8]) -- 大奖池当前轮次金额

-- 核心约束：强制小轮次 ≥ 大轮次
if small_round < big_round then
    small_round = big_round
end

-- 1. 基础金额拆分
local recv_gold = gift_gold * 0.5
local small_pool_add = gift_gold * 0.5

-- 2. Redis键定义
local small_round_key = "lottery:small_pool:round"
local small_total_times_key = "lottery:small_pool:total_times"
local small_total_gold_key = "lottery:small_pool:total_gold"
local big_round_key = "lottery:big_pool:round"
local big_total_gold_key = "lottery:big_pool:total_gold"

-- 初始化轮次（确保Redis与入参一致）
redis.call('set', small_round_key, small_round)
redis.call('set', big_round_key, big_round)
-- 初始化大奖池金额
if big_total_gold == 0 or big_total_gold == nil then
    big_total_gold = tonumber(redis.call('get', big_total_gold_key) or 0)
end

-- 3. 小奖池累计更新
local small_total_times = tonumber(redis.call('incr', small_total_times_key))
local small_total_gold = tonumber(redis.call('get', small_total_gold_key) or 0)
small_total_gold = math.floor((small_total_gold + small_pool_add) * 100) / 100
redis.call('set', small_total_gold_key, small_total_gold)

-- 4. 返回结果初始化（区分大小轮次）
local result = {
    send_uid = send_uid,
    recv_uid = recv_uid,
    gift_gold = gift_gold,
    recv_gold = recv_gold,
    small_pool_add = small_pool_add,
    small_total_times = small_total_times,
    small_total_gold = small_total_gold,
    is_small_prize = 0,
    small_prize_amount = 0,
    small_remain_amount = 0,
    is_big_prize = 0,
    big_prize_amount = 0,
    big_release_amount = 0,
    small_round = small_round, -- 小奖池轮次
    big_round = big_round,     -- 大奖池轮次
    big_total_gold = big_total_gold,
    -- 新增：记录要划入下一轮的小奖开奖金额
    small_prize_to_big_next_round = 0
}

-- 5. 小奖池开奖判断（小轮次+1）
if small_total_times >= small_trigger_times then
    result.is_small_prize = 1
    -- 小奖随机比例
    local small_ratio = math.random(2, 99)
    result.small_prize_amount = math.floor(small_total_gold * small_ratio / 100 * 100) / 100
    -- 小奖剩余金额（划入大奖池当前轮次）
    result.small_remain_amount = math.floor((small_total_gold - result.small_prize_amount) * 100) / 100

    -- 重置小奖池，小轮次+1
    redis.call('set', small_total_times_key, 0)
    redis.call('set', small_total_gold_key, 0)
    small_round = small_round + 1
    redis.call('set', small_round_key, small_round)
    result.small_round = small_round

    -- 6. 小奖剩余划入大奖池当前轮次
    big_total_gold = math.floor((big_total_gold + result.small_remain_amount) * 100) / 100
    redis.call('set', big_total_gold_key, big_total_gold)
    result.big_total_gold = big_total_gold

    -- 7. 大奖池开奖判断（大轮次+1）
    if big_total_gold >= big_threshold then
        result.is_big_prize = 1
        -- 大奖比例权重
        local weight_sum = 20 + 50 + 30
        local random_weight = math.random(1, weight_sum)
        local big_ratio = random_weight <= 20 and 60 or (random_weight <= 70 and 70 or 80)
        -- 大奖金额
        result.big_prize_amount = math.floor(big_total_gold * big_ratio / 100 * 100) / 100
        result.big_release_amount = math.floor((big_total_gold - result.big_prize_amount) * 100) / 100

        -- 原有逻辑：重置大奖池，大轮次+1
        redis.call('set', big_total_gold_key, 0)
        big_round = big_round + 1
        redis.call('set', big_round_key, big_round)
        -- 强制保证小轮次≥大轮次
        if small_round < big_round then
            small_round = big_round
            redis.call('set', small_round_key, small_round)
            result.small_round = small_round
        end
        result.big_round = big_round
        result.big_total_gold = 0

        -- ===================== 新增核心逻辑 =====================
        -- 小奖开奖金额累加到大奖池下一轮次（新的big_round）
        result.small_prize_to_big_next_round = result.small_prize_amount
        -- 原子性更新大奖池下一轮次金额
        local new_big_total_gold = math.floor(result.small_prize_amount * 100) / 100
        redis.call('set', big_total_gold_key, new_big_total_gold)
        result.big_total_gold = new_big_total_gold
        -- ======================================================
    end
end

-- 返回结果
return cjson.encode(result)
LUA;

    }

}