using YLErp.BLL;
using YLErp.DBModels;
using YLErp.Enums;
using YLErp.Modules.MarginModule;

namespace YLErp.Modules.SwapModule.Margin
{
    /// <summary>
    /// R2 阶段三 §3.2 估值报告/可用资金查询输入（静态查询，供 ClientBalanceUtility 与 RealTimeClientBanlanceService 共用，保证三处口径一致）。
    /// 口径：
    /// - 互换初始保证金（净收取为正）= 客户 应付预付金 流水收付净额取反（客户应付入金记负、平仓返还为正，取负号后净收取为正）；
    /// - 交易维度追加保证金（合约维度）= Σ(维持保证金 − 累计保证金)：
    ///   维持保证金取当日 trade_span.Spv（区间追保结构引擎产出，我方净收取为正）；
    ///   累计保证金 = 该交易 应付预付金+追加保证金 流水收付净额 + 追加保证金授信占用净额（§0 口径，阶段四 §4.1 起）；
    ///   仅统计规则15（区间追保结构，R1 三层级解析，与引擎同口径）且有当日 trade_span 的交易。
    /// </summary>
    public static class SwapSpanBalanceQueryService
    {
        /// <summary>
        /// 客户维度输入：互换初始保证金（净收取为正，按客户汇总）。
        /// </summary>
        public static Dictionary<int, double> GetSwapInitMarginByClients(List<int> clientIds, DateTime valueDate, YLContext db)
        {
            if (clientIds == null || clientIds.Count == 0)
            {
                return new Dictionary<int, double>();
            }

            var flows = db.ClientCashInCashOut.AsNoTracking()
                .Where(x => clientIds.Contains(x.ClientId ?? 0)
                    && x.Action == ClientCashInCashOut.系统操作_应付预付金
                    && x.HappenDate <= valueDate
                    && x.ValidState != ConsGlobal.InValid
                    && (x.State == ClientCashInCashOut.已确认 || x.State == ClientCashInCashOut.已结算)
                    && x.Money != null)
                .Select(x => new { ClientId = x.ClientId ?? 0, Money = x.Money ?? 0d })
                .ToList();

            return flows.GroupBy(x => x.ClientId)
                .ToDictionary(g => g.Key, g => -g.Sum(x => x.Money));
        }

        /// <summary>
        /// 合约维度输入：交易维度追加保证金合计 = Σ(维持保证金 − 累计保证金)，按客户汇总。
        /// </summary>
        public static Dictionary<int, double> GetTradeAdditionalMarginByClients(List<int> clientIds, DateTime valueDate, YLContext db)
        {
            var result = new Dictionary<int, double>();
            if (clientIds == null || clientIds.Count == 0)
            {
                return result;
            }

            //当日维持保证金（引擎产出：我方净收取为正）——先取当日有 span 的客户交易，再按规则15过滤
            var maintenance = db.trade_span.AsNoTracking()
                .Where(x => x.ValueDate == valueDate && x.Spv != null
                            && x.ClientId != null && clientIds.Contains(x.ClientId.Value))
                .Select(x => new { x.TradeId, x.ClientId, Spv = x.Spv ?? 0d })
                .ToList();
            if (maintenance.Count == 0)
            {
                return result;
            }
            var spanTradeIds = maintenance.Select(x => x.TradeId).Distinct().ToList();

            //规则15（区间追保结构）交易：R1 三层级解析（BUG-02 修正，与引擎/结算判定同口径）——
            //交易绑定→客户默认→全局默认 找到即停；无预付金等其他规则产出/留存的 span 行不计入追保缺口
            var spanTrades = db.trade.AsNoTracking().Where(t => spanTradeIds.Contains(t.id)).ToList();
            var templatesByTrade = MarginTemplateV2RateHelper.ResolveTieredTemplates(spanTrades, valueDate, db);
            var rule15TradeIds = spanTrades
                .Where(t => templatesByTrade.TryGetValue(t.id, out var tpl)
                            && tpl.RuleType == (int)MarginRuleTypeEnum.区间追保结构)
                .Select(t => t.id)
                .ToHashSet();
            maintenance = maintenance.Where(x => rule15TradeIds.Contains(x.TradeId)).ToList();
            if (maintenance.Count == 0)
            {
                return result;
            }

            //累计保证金：该交易 应付预付金+追加保证金 流水收付净额取反（收取为正）；
            //追加保证金的授信占用部分不产生资金流水（阶段二口径），阶段四 §4.1 起一并计入——
            //否则结算后缺口残留（=授信部分），与可用资金公式里的 −已使用授信 形成双扣
            var marginActions = new List<string> { ClientCashInCashOut.系统操作_应付预付金, ClientCashInCashOut.系统操作_追加保证金 };
            var accumulated = db.ClientCashInCashOut.AsNoTracking()
                .Where(x => x.TradeId != null && spanTradeIds.Contains(x.TradeId ?? 0)
                    && marginActions.Contains(x.Action)
                    && x.HappenDate <= valueDate
                    && x.ValidState != ConsGlobal.InValid
                    && (x.State == ClientCashInCashOut.已确认 || x.State == ClientCashInCashOut.已结算)
                    && x.Money != null)
                .GroupBy(x => x.TradeId)
                .Select(g => new { TradeId = g.Key ?? 0, Sum = -g.Sum(x => x.Money ?? 0d) })
                .ToDictionary(x => x.TradeId, x => x.Sum);

            //追加保证金的授信占用净额（amount 占用记正 → 直接求和（BUG-01 修正口径）；remark 前缀标识）
            var addCreditOccupied = db.client_credit_inout.AsNoTracking()
                .Where(x => x.trade_id != null && spanTradeIds.Contains(x.trade_id ?? 0)
                    && x.remark.StartsWith(ClientCreditInoutService.AdditionalMarginRemark))
                .GroupBy(x => x.trade_id)
                .Select(g => new { TradeId = g.Key ?? 0, Sum = g.Sum(x => x.amount) })
                .ToDictionary(x => x.TradeId, x => x.Sum);

            foreach (var group in maintenance.GroupBy(x => x.ClientId ?? 0))
            {
                var total = group.Sum(x => x.Spv
                    - (accumulated.TryGetValue(x.TradeId, out var acc) ? acc : 0d)
                    - (addCreditOccupied.TryGetValue(x.TradeId, out var occupied) ? occupied : 0d));
                result[group.Key] = total;
            }

            return result;
        }
    }
}