using Admin.NET.Plugin.AiDOP.MaterialWarehouse;
using Microsoft.Extensions.Logging.Abstractions;
using SqlSugar;
using Xunit;

namespace Admin.NET.Plugin.AiDOP.Tests.MaterialWarehouse;

/// <summary>
/// 库存物化有界等待锁的进程内行为。不连真实库。
/// 跨连接互斥留在 S5 集成测试，仅当 AIDOP_IT=1 时执行。
/// </summary>
public class InventoryInboundLockGuardAcquireTests
{
    [Fact]
    public void ProductionDefaults_AreTenMinutesAndTwoSeconds()
    {
        Assert.Equal(TimeSpan.FromMinutes(10), InventoryInboundLockGuard.DefaultWaitTimeout);
        Assert.Equal(TimeSpan.FromSeconds(2), InventoryInboundLockGuard.DefaultPollInterval);
    }

    [Fact]
    public async Task AcquireAsync_PreCancelledToken_StopsBeforeWaiting()
    {
        using var db = ClosedClient();
        using var cts = new CancellationTokenSource();
        cts.Cancel();

        var started = DateTime.UtcNow;
        await Assert.ThrowsAnyAsync<OperationCanceledException>(() =>
            InventoryInboundLockGuard.AcquireAsync(
                db, NullLogger.Instance, "aidop:t:inv-in:cancel",
                TimeSpan.FromSeconds(5), TimeSpan.FromMilliseconds(50), cts.Token));
        Assert.True(DateTime.UtcNow - started < TimeSpan.FromSeconds(2));
    }

    [Fact]
    public async Task AcquireAsync_UnreachableDatabase_TimesOutWithFixedMessage()
    {
        using var db = ClosedClient();
        var ex = await Assert.ThrowsAsync<TimeoutException>(() =>
            InventoryInboundLockGuard.AcquireAsync(
                db, NullLogger.Instance, "aidop:t:inv-in:timeout",
                TimeSpan.FromMilliseconds(200), TimeSpan.FromMilliseconds(50)));
        Assert.Equal("inventory materialization lock busy", ex.Message);
    }

    [Fact]
    public void TenantMaterializeEntry_WaitsForLock_BackgroundPathsStayNonBlocking()
    {
        var src = File.ReadAllText(Path.Combine(RepoRoot(),
            "server", "Plugins", "Admin.NET.Plugin.AiDOP", "MaterialWarehouse", "InventoryMdpSyncService.cs"));
        var method = Slice(src, "public async Task<int> TransformTransStdFromStgAsync(", "private async Task<InventorySyncResult> RunAsync");
        Assert.Contains("InventoryInboundLockGuard.AcquireAsync(", method, StringComparison.Ordinal);
        Assert.DoesNotContain("TryAcquireAsync", method, StringComparison.Ordinal);
        Assert.True(Count(src, "InventoryInboundLockGuard.TryAcquireAsync(") >= 3);
    }

    private static SqlSugarClient ClosedClient() => new(new ConnectionConfig
    {
        DbType = DbType.MySql,
        ConnectionString = "Server=127.0.0.1;Port=1;User ID=x;Password=x;Database=x;Connection Timeout=1;Pooling=false;",
        IsAutoCloseConnection = true,
    });

    private static string RepoRoot()
    {
        var dir = new DirectoryInfo(AppContext.BaseDirectory);
        while (dir != null && !File.Exists(Path.Combine(dir.FullName, "AGENTS.md")))
            dir = dir.Parent;
        return dir?.FullName ?? throw new InvalidOperationException("repo root not found");
    }

    private static string Slice(string src, string start, string end)
    {
        var i = src.IndexOf(start, StringComparison.Ordinal);
        var j = src.IndexOf(end, i, StringComparison.Ordinal);
        Assert.True(i >= 0 && j > i);
        return src[i..j];
    }

    private static int Count(string src, string token)
    {
        var n = 0;
        var i = 0;
        while ((i = src.IndexOf(token, i, StringComparison.Ordinal)) >= 0)
        {
            n++;
            i += token.Length;
        }
        return n;
    }
}