using Microsoft.Extensions.Configuration;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Runtime.Historian;

namespace ZB.MOM.WW.OtOpcUa.Runtime.Tests.Historian;

/// <summary>
///     Covers the gateway-shaped <see cref="ServerHistorianOptions.Validate"/> warnings: a disabled or
///     correctly-configured historian is silent; an enabled one with a blank <c>Endpoint</c> or blank
///     <c>ApiKey</c> surfaces an operator-facing warning (carrying no secret value text).
/// </summary>
public sealed class ServerHistorianOptionsTests
{
    [Fact]
    public void Disabled_yields_no_warnings()
        => Assert.Empty(new ServerHistorianOptions { Enabled = false }.Validate());

    [Fact]
    public void Enabled_without_endpoint_warns()
    {
        var w = new ServerHistorianOptions { Enabled = true, Endpoint = "", ApiKey = "histgw_x_y" }.Validate();
        Assert.Contains(w, m => m.Contains("Endpoint"));
    }

    [Fact]
    public void Enabled_with_malformed_endpoint_warns()
    {
        // archreview 06/S-11 warning parity: a non-empty but unparseable / non-absolute Endpoint warns
        // too, so the Runtime-side registration logs describe malformed endpoints (not just empty ones),
        // keeping this surface consistent with the Host's fail-fast ServerHistorianOptionsValidator.
        var w = new ServerHistorianOptions { Enabled = true, Endpoint = "not a uri", ApiKey = "histgw_x_y" }.Validate();
        Assert.Contains(w, m => m.Contains("Endpoint"));
    }

    [Fact]
    public void Enabled_without_apikey_warns()
    {
        var w = new ServerHistorianOptions { Enabled = true, Endpoint = "https://h:5222", ApiKey = "" }.Validate();
        Assert.Contains(w, m => m.Contains("ApiKey"));
    }

    [Fact]
    public void Valid_config_is_clean()
        => Assert.Empty(new ServerHistorianOptions { Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y" }.Validate());

    [Fact]
    public void Enabled_with_nonpositive_MaxTieClusterOverfetch_warns()
    {
        var w = new ServerHistorianOptions
        { Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", MaxTieClusterOverfetch = 0 }
            .Validate();
        Assert.Contains(w, m => m.Contains("MaxTieClusterOverfetch"));
    }

    // ── S3 HistoryRead concurrency knobs (arch-review 03/S3) ────────────────────────────────────

    [Fact]
    public void HistoryRead_knob_defaults()
    {
        var o = new ServerHistorianOptions();
        Assert.Equal(4, o.HistoryReadBatchParallelism);
        Assert.Equal(16, o.MaxConcurrentHistoryReadBatches);
        Assert.Equal(TimeSpan.FromSeconds(60), o.HistoryReadDeadline);
    }

    [Fact]
    public void Enabled_with_nonpositive_HistoryReadBatchParallelism_warns()
    {
        var w = new ServerHistorianOptions
        { Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", HistoryReadBatchParallelism = 0 }
            .Validate();
        Assert.Contains(w, m => m.Contains("HistoryReadBatchParallelism"));
    }

    [Fact]
    public void Enabled_with_nonpositive_MaxConcurrentHistoryReadBatches_warns()
    {
        var w = new ServerHistorianOptions
        { Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", MaxConcurrentHistoryReadBatches = 0 }
            .Validate();
        Assert.Contains(w, m => m.Contains("MaxConcurrentHistoryReadBatches"));
    }

    [Fact]
    public void Enabled_with_nonpositive_HistoryReadDeadline_warns()
    {
        var w = new ServerHistorianOptions
        { Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", HistoryReadDeadline = TimeSpan.Zero }
            .Validate();
        Assert.Contains(w, m => m.Contains("HistoryReadDeadline"));
    }

    [Fact]
    public void MaxTimeWeightedRawRows_defaults_to_one_million_and_warns_when_nonpositive()
    {
        Assert.Equal(1_000_000, new ServerHistorianOptions().MaxTimeWeightedRawRows);
        var w = new ServerHistorianOptions
        { Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", MaxTimeWeightedRawRows = 0 }
            .Validate();
        Assert.Contains(w, m => m.Contains("MaxTimeWeightedRawRows"));
    }

    /// <summary>
    ///     #674: the HistoryUpdate future-skew bound defaults to one day and binds from configuration as a TimeSpan;
    ///     a non-positive value is a deliberate "disabled", not a misconfiguration, so it does not warn.
    /// </summary>
    /// <summary>#691: the ReturnBounds kill switch defaults on and binds off; neither value warns.</summary>
    [Fact]
    public void HonorReturnBounds_defaults_to_true_and_binds_false_silently()
    {
        Assert.True(new ServerHistorianOptions().HonorReturnBounds);
        var bound = new ConfigurationBuilder()
            .AddInMemoryCollection(new Dictionary<string, string?> { ["ServerHistorian:HonorReturnBounds"] = "false" })
            .Build()
            .GetSection(ServerHistorianOptions.SectionName)
            .Get<ServerHistorianOptions>();
        Assert.False(bound!.HonorReturnBounds);
        Assert.Empty(new ServerHistorianOptions
            { Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", HonorReturnBounds = false }.Validate());
    }

    /// <summary>#694: the events horizon defaults off, binds as a TimeSpan, and only a negative value warns.</summary>
    [Fact]
    public void EventReadHorizon_defaults_off_binds_and_only_a_negative_value_warns()
    {
        Assert.Equal(TimeSpan.Zero, new ServerHistorianOptions().EventReadHorizon);
        var bound = new ConfigurationBuilder()
            .AddInMemoryCollection(new Dictionary<string, string?> { ["ServerHistorian:EventReadHorizon"] = "3650.00:00:00" })
            .Build()
            .GetSection(ServerHistorianOptions.SectionName)
            .Get<ServerHistorianOptions>();
        Assert.Equal(TimeSpan.FromDays(3650), bound!.EventReadHorizon);
        Assert.Empty(new ServerHistorianOptions
            { Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", EventReadHorizon = TimeSpan.FromDays(30) }.Validate());
        var w = new ServerHistorianOptions
            { Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", EventReadHorizon = TimeSpan.FromDays(-1) }.Validate();
        Assert.Contains(w, m => m.Contains("EventReadHorizon"));
    }

    [Fact]
    public void HistoryUpdateMaxFutureSkew_defaults_to_one_day_binds_and_zero_is_silent()
    {
        Assert.Equal(TimeSpan.FromDays(1), new ServerHistorianOptions().HistoryUpdateMaxFutureSkew);
        var bound = new ConfigurationBuilder()
            .AddInMemoryCollection(new Dictionary<string, string?>
            {
                ["ServerHistorian:HistoryUpdateMaxFutureSkew"] = "00:05:00",
            })
            .Build()
            .GetSection(ServerHistorianOptions.SectionName)
            .Get<ServerHistorianOptions>();
        Assert.Equal(TimeSpan.FromMinutes(5), bound!.HistoryUpdateMaxFutureSkew);
        var w = new ServerHistorianOptions
        { Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", HistoryUpdateMaxFutureSkew = TimeSpan.Zero }
            .Validate();
        Assert.Empty(w);
    }

    [Fact]
    public void Disabled_with_nonpositive_HistoryRead_knobs_is_silent()
    {
        var w = new ServerHistorianOptions
        {
            Enabled = false,
            HistoryReadBatchParallelism = 0,
            MaxConcurrentHistoryReadBatches = 0,
            HistoryReadDeadline = TimeSpan.Zero,
        }.Validate();
        Assert.Empty(w);
    }

    // ── MaxRawValuesPerRead (R08:1.1, #736) ─────────────────────────────────────────────────────

    [Fact]
    public void MaxRawValuesPerRead_defaults_to_ten_thousand_and_binds()
    {
        var o = new ServerHistorianOptions();
        Assert.Equal(10_000, o.MaxRawValuesPerRead);
        Assert.Equal(10_000, ServerHistorianOptions.DefaultMaxRawValuesPerRead);
        Assert.Equal(10_000, o.EffectiveMaxRawValuesPerRead);

        var bound = new ConfigurationBuilder()
            .AddInMemoryCollection(new Dictionary<string, string?> { ["ServerHistorian:MaxRawValuesPerRead"] = "2500" })
            .Build()
            .GetSection(ServerHistorianOptions.SectionName)
            .Get<ServerHistorianOptions>()!;
        Assert.Equal(2500, bound.MaxRawValuesPerRead);
        Assert.Equal(2500, bound.EffectiveMaxRawValuesPerRead);
        Assert.Empty(new ServerHistorianOptions
        {
            Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", MaxRawValuesPerRead = 2500,
        }.Validate());
    }

    [Theory]
    [InlineData(0)]
    [InlineData(-5)]
    public void Nonpositive_MaxRawValuesPerRead_is_unbounded_and_warns_when_enabled(int value)
    {
        var o = new ServerHistorianOptions
        {
            Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", MaxRawValuesPerRead = value,
        };
        Assert.Equal(0, o.EffectiveMaxRawValuesPerRead);
        var w = o.Validate();
        var m = Assert.Single(w);
        Assert.Contains("MaxRawValuesPerRead", m);
        Assert.Contains("unbounded", m);
    }

    [Theory]
    [InlineData(1)]
    [InlineData(2)]
    public void A_MaxRawValuesPerRead_below_three_is_raised_to_three_and_warns_when_enabled(int value)
    {
        // A resumed page's read must carry a value, the boundary tie it re-reads and the lookahead row that says "more
        // follows": at 2 it has no room and every value costs an empty page with a continuation point (the #692 defect).
        var o = new ServerHistorianOptions
        {
            Enabled = true, Endpoint = "https://h:5222", ApiKey = "histgw_x_y", MaxRawValuesPerRead = value,
        };
        Assert.Equal(3, o.EffectiveMaxRawValuesPerRead);
        Assert.Equal(ServerHistorianOptions.MinMaxRawValuesPerRead, o.EffectiveMaxRawValuesPerRead);
        var m = Assert.Single(o.Validate());
        Assert.Contains("MaxRawValuesPerRead", m);
        Assert.Equal(3, new ServerHistorianOptions { MaxRawValuesPerRead = 3 }.EffectiveMaxRawValuesPerRead);
    }

    [Fact]
    public void Disabled_with_an_odd_MaxRawValuesPerRead_is_silent()
    {
        Assert.Empty(new ServerHistorianOptions { Enabled = false, MaxRawValuesPerRead = 0 }.Validate());
        Assert.Empty(new ServerHistorianOptions { Enabled = false, MaxRawValuesPerRead = 1 }.Validate());
    }
}