using Admin.NET.Plugin.AiDOP.DataPlatform;
using Microsoft.Extensions.Logging;

namespace Admin.NET.Plugin.AiDOP.Order;

/// <summary>
/// 从 165（DOPDEMORQ_SQLSERVER）批量读取实时可用库存。
///
/// 只读、只查 InvMaster；连接经 MdpSourceScopeFactory 走 mdp_source 配置，不新开连接串。
/// 口径与本库旧实现逐字对齐（跨全部 Location 求和、COALESCE(AvailStatusQty, QtyOnHand, 0)、
/// 不过滤 IsActive），本包只换数据新鲜度，不动口径。
/// 分块 IN 查询，避免逐物料跨库往返。
/// </summary>
public sealed class Mes165StockReader : ITransient
{
    private const string SourceCode = "DOPDEMORQ_SQLSERVER";

    private readonly MdpSourceScopeFactory _scopeFactory;
    private readonly ILogger _logger;

    public Mes165StockReader(MdpSourceScopeFactory scopeFactory, ILoggerFactory loggerFactory)
    {
        _scopeFactory = scopeFactory;
        _logger = loggerFactory.CreateLogger(nameof(Mes165StockReader));
    }

    /// <summary>按物料号批量取可用库存；返回不含未命中的物料（调用方按 0 处理）。</summary>
    public async Task<Dictionary<string, decimal>> LoadAvailableQtyAsync(
        IReadOnlyList<string> itemNumbers,
        string domain,
        int batchSize = 500,
        CancellationToken ct = default)
    {
        var result = new Dictionary<string, decimal>(StringComparer.OrdinalIgnoreCase);
        if (itemNumbers.Count == 0)
            return result;

        var remote = await _scopeFactory.GetScopeAsync(SourceCode, ct);
        var size = batchSize <= 0 ? 500 : batchSize;

        for (var offset = 0; offset < itemNumbers.Count; offset += size)
        {
            ct.ThrowIfCancellationRequested();
            var chunk = itemNumbers.Skip(offset).Take(size).ToList();

            var names = new List<string>(chunk.Count);
            var pars = new List<SugarParameter> { new("@Domain", domain) };
            for (var i = 0; i < chunk.Count; i++)
            {
                names.Add($"@i{i}");
                pars.Add(new SugarParameter($"@i{i}", chunk[i]));
            }

            var sql =
                $"""
                SELECT ItemNum AS ItemNum,
                       SUM(COALESCE(AvailStatusQty, QtyOnHand, 0)) AS Qty
                FROM InvMaster
                WHERE Domain = @Domain
                  AND ItemNum IN ({string.Join(",", names)})
                GROUP BY ItemNum
                """;

            var rows = await remote.Ado.SqlQueryAsync<StockRow>(sql, pars);
            foreach (var r in rows)
            {
                if (string.IsNullOrWhiteSpace(r.ItemNum)) continue;
                result[r.ItemNum.Trim()] = r.Qty;
            }
        }

        _logger.LogInformation(
            "[Mes165StockReader] domain={Domain} requested={Requested} matched={Matched}",
            domain, itemNumbers.Count, result.Count);

        return result;
    }

    private sealed class StockRow
    {
        public string? ItemNum { get; set; }
        public decimal Qty { get; set; }
    }
}