using Admin.NET.Plugin.AiDOP.MaterialWarehouse.InventoryPosting.Entity;

namespace Admin.NET.Plugin.AiDOP.MaterialWarehouse.InventoryPosting.Idempotency;

/// <summary>
/// IQC 入库过账幂等服务。幂等键 = tenant_id + domain_code + FBILLNO（DB UNIQUE 兜底，见 <see cref="AdoIqcInventoryPosting"/>）。
/// **禁止**用 FINSPECTSTATUS='检验完成' 判断是否已入库；**禁止**先查后插（有并发窗口）。
/// 认领语义：INSERT 原子占位（成功=FirstProcess）；撞唯一约束→回读既有→按 posting_status 分类。
/// 注意：Phase 4 仅建立幂等认领；真正的库存过账动作在 Phase 5。
/// </summary>
public sealed class IqcPostingIdempotencyService
{
    private readonly IIqcPostingStore _store;

    public IqcPostingIdempotencyService(IIqcPostingStore store)
    {
        _store = store ?? throw new ArgumentNullException(nameof(store));
    }

    /// <summary>
    /// 认领一次 IQC 入库过账。<paramref name="init"/> 可在插入前补齐过账头字段（receiver/rct_qc_nbr/branch_no/mrb_status 等）。
    /// </summary>
    public async Task<IqcPostingClaimResult> ClaimAsync(
        long tenantId, string domainCode, string fbillNo, Action<AdoIqcInventoryPosting> init = null)
    {
        if (string.IsNullOrWhiteSpace(fbillNo))
            throw new ArgumentException("FBILLNO 不能为空", nameof(fbillNo));

        var posting = new AdoIqcInventoryPosting
        {
            TenantId = tenantId,
            DomainCode = domainCode ?? string.Empty,
            FbillNo = fbillNo,
            PostingStatus = "PROCESSING",
            PostingMode = "SHADOW",
            CreateTime = DateTime.Now,
        };
        posting.UpdateTime = posting.CreateTime;   // 认领即起租(lease 心跳基准，供 stale 恢复)
        init?.Invoke(posting);

        var ins = await _store.TryInsertAsync(posting);
        if (ins.Inserted)
            return new IqcPostingClaimResult { Outcome = IqcPostingClaimOutcome.FirstProcess, Posting = posting, IsNew = true };

        var existing = ins.Existing ?? await _store.GetAsync(tenantId, domainCode ?? string.Empty, fbillNo);
        return new IqcPostingClaimResult { Outcome = Classify(existing?.PostingStatus), Posting = existing, IsNew = false };
    }

    /// <summary>业务提交成功后标记过账完成（POSTED）——L1 consume 端在业务事务 Commit 成功后调用（ack）。</summary>
    public Task MarkPostedAsync(AdoIqcInventoryPosting posting) => _store.UpdateStatusAsync(posting, "POSTED");

    /// <summary>业务失败后标记 FAILED（可重试）——保持事件 retryable，不 ack。</summary>
    public Task MarkFailedAsync(AdoIqcInventoryPosting posting) => _store.UpdateStatusAsync(posting, "FAILED");

    /// <summary>
    /// 尝试原子抢占 stale PROCESSING（Phase 7C）：lease 已过期才抢占成功（rows=1→true）。
    /// 并发多路仅一路 true，用于 stale Processing 恢复（避免永久 skip）。
    /// </summary>
    public Task<bool> TryRecoverStaleAsync(long tenantId, string domainCode, string fbillNo, TimeSpan lease)
    {
        var now = DateTime.Now;
        return _store.TryRecoverStaleAsync(tenantId, domainCode ?? string.Empty, fbillNo, now - lease, now);
    }

    /// <summary>按既有过账头状态分类认领结果。未知态保守视为 Processing（不重复过账）。</summary>
    public static IqcPostingClaimOutcome Classify(string postingStatus)
    {
        switch ((postingStatus ?? string.Empty).Trim().ToUpperInvariant())
        {
            case "POSTED": return IqcPostingClaimOutcome.AlreadyProcessed;
            case "FAILED": return IqcPostingClaimOutcome.FailedRetryable;
            case "PROCESSING":
            case "PENDING": return IqcPostingClaimOutcome.Processing;
            default: return IqcPostingClaimOutcome.Processing;
        }
    }
}