using ZB.MOM.WW.ScadaBridge.CentralUI.Components.Pages.Deployment;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Templates;
using ZB.MOM.WW.ScadaBridge.Commons.Types;

namespace ZB.MOM.WW.ScadaBridge.CentralUI.Tests.Components;

/// <summary>
/// The Instance Configure page's Native Alarm Source Overrides card accepts a CSV of
/// per-instance retargets via an <c>&lt;InputFile&gt;</c> — the UI half of the CLI's
/// <c>instance native-alarm-source import --file</c>. The upload is parsed with the
/// SHARED <see cref="NativeAlarmSourceOverrideCsvParser"/> (no duplicated parsing),
/// validated against the template's source bindings with the same batch rules the
/// server enforces (name resolves, not template-locked, no duplicate source), and —
/// all-or-nothing — either upserted through the SAME repository path the inline Save
/// uses or rejected with the per-line error list and nothing applied.
///
/// <para>
/// <c>InstanceConfigure</c> is a heavyweight page (≈7 injected services incl. the
/// flattening pipeline), so — consistent with the attribute-importer and native-alarm
/// card coverage — the parse→validate→build-rows core is extracted to an
/// <c>internal static</c> helper exercised directly here, plus structural assertions
/// over the component source that pin the InputFile + reuse-the-existing-save-path
/// wiring.
/// </para>
/// </summary>
public class InstanceConfigureNativeAlarmCsvImportTests
{
    private static string InstanceConfigureMarkup
    {
        get
        {
            var dir = AppContext.BaseDirectory;
            for (var i = 0; i < 6 && dir is not null; i++)
                dir = Directory.GetParent(dir)?.FullName;
            return File.ReadAllText(Path.Combine(dir!, "src", "ZB.MOM.WW.ScadaBridge.CentralUI",
                "Components", "Pages", "Deployment", "InstanceConfigure.razor"));
        }
    }

    private static List<TemplateNativeAlarmSource> Sources() => new()
    {
        new TemplateNativeAlarmSource("BoilerAlarms")
        {
            ConnectionName = "opc-a", SourceReference = "ns=2;s=Boiler", IsLocked = false
        },
        new TemplateNativeAlarmSource("PumpAlarms")
        {
            ConnectionName = "opc-a", SourceReference = "ns=2;s=Pump", IsLocked = false
        },
        new TemplateNativeAlarmSource("LockedAlarms")
        {
            ConnectionName = "opc-a", SourceReference = "ns=2;s=Locked", IsLocked = true
        },
    };

    // ── Core: valid CSV → rows, no errors ───────────────────────────────────

    [Fact]
    public void ValidCsv_BuildsRetargetRows_WithNoErrors()
    {
        var csv = "SourceName,Connection,SourceReference,Filter\n"
                + "BoilerAlarms,opc-b,ns=2;s=Boiler2,HighHigh\n"
                + "PumpAlarms,,ns=2;s=Pump2,\n";
        var parsed = NativeAlarmSourceOverrideCsvParser.Parse(csv);

        var outcome = InstanceConfigure.BuildNativeAlarmSourceCsvImport(parsed, Sources());

        Assert.False(outcome.HasErrors);
        Assert.Empty(outcome.Errors);
        Assert.Equal(2, outcome.Rows.Count);

        var boiler = outcome.Rows[0];
        Assert.Equal("BoilerAlarms", boiler.SourceName);
        Assert.Equal("opc-b", boiler.Connection);
        Assert.Equal("ns=2;s=Boiler2", boiler.SourceReference);
        Assert.Equal("HighHigh", boiler.Filter);
        Assert.False(boiler.IsClear);

        // Blank field = keep the inherited value (null), same as the inline editor.
        var pump = outcome.Rows[1];
        Assert.Null(pump.Connection);
        Assert.Equal("ns=2;s=Pump2", pump.SourceReference);
        Assert.Null(pump.Filter);
    }

    [Fact]
    public void AllBlankRow_IsMarkedAsClear()
    {
        // Every field blank = "inherit everything" — the caller clears any existing
        // override row, exactly as the inline Save does when all fields are blank.
        var csv = "SourceName,Connection,SourceReference,Filter\nBoilerAlarms,,,\n";
        var parsed = NativeAlarmSourceOverrideCsvParser.Parse(csv);

        var outcome = InstanceConfigure.BuildNativeAlarmSourceCsvImport(parsed, Sources());

        Assert.False(outcome.HasErrors);
        var row = Assert.Single(outcome.Rows);
        Assert.True(row.IsClear);
    }

    [Fact]
    public void SourcesAbsentFromTheFile_AreUntouched_MergeNotReplace()
    {
        // Merge semantics (matching the CLI): only the named source is in the batch;
        // PumpAlarms/LockedAlarms keep whatever override they already have.
        var csv = "SourceName,Connection,SourceReference,Filter\nBoilerAlarms,opc-b,,\n";
        var parsed = NativeAlarmSourceOverrideCsvParser.Parse(csv);

        var outcome = InstanceConfigure.BuildNativeAlarmSourceCsvImport(parsed, Sources());

        Assert.False(outcome.HasErrors);
        Assert.Equal("BoilerAlarms", Assert.Single(outcome.Rows).SourceName);
    }

    // ── Core: bad rows → errors, NO rows (all-or-nothing) ───────────────────

    [Fact]
    public void UnknownSource_ProducesError_AndAppliesNothing()
    {
        var csv = "SourceName,Connection,SourceReference,Filter\n"
                + "DoesNotExist,opc-b,,\n"
                + "BoilerAlarms,opc-b,,\n";
        var parsed = NativeAlarmSourceOverrideCsvParser.Parse(csv);

        var outcome = InstanceConfigure.BuildNativeAlarmSourceCsvImport(parsed, Sources());

        Assert.True(outcome.HasErrors);
        Assert.Empty(outcome.Rows); // all-or-nothing: nothing applied
        Assert.Contains(outcome.Errors, e => e.Contains("DoesNotExist") && e.Contains("Line 2"));
    }

    [Fact]
    public void TemplateLockedSource_IsRejected_LikeTheServer()
    {
        var csv = "SourceName,Connection,SourceReference,Filter\nLockedAlarms,opc-b,,\n";
        var parsed = NativeAlarmSourceOverrideCsvParser.Parse(csv);

        var outcome = InstanceConfigure.BuildNativeAlarmSourceCsvImport(parsed, Sources());

        Assert.True(outcome.HasErrors);
        Assert.Empty(outcome.Rows);
        Assert.Contains(outcome.Errors, e => e.Contains("LockedAlarms") && e.Contains("locked"));
    }

    [Fact]
    public void DuplicateSource_IsRejected_AndAppliesNothing()
    {
        var csv = "SourceName,Connection,SourceReference,Filter\n"
                + "BoilerAlarms,opc-b,,\n"
                + "BoilerAlarms,opc-c,,\n";
        var parsed = NativeAlarmSourceOverrideCsvParser.Parse(csv);

        var outcome = InstanceConfigure.BuildNativeAlarmSourceCsvImport(parsed, Sources());

        Assert.True(outcome.HasErrors);
        Assert.Empty(outcome.Rows);
        Assert.Contains(outcome.Errors, e => e.Contains("BoilerAlarms") && e.Contains("more than once"));
    }

    [Fact]
    public void ParserErrors_PropagateThrough_AndApplyNothing()
    {
        // A bad header makes the parser emit an error and zero rows; the import must
        // surface that error and apply nothing.
        var csv = "Wrong,Header\nBoilerAlarms,opc-b,,\n";
        var parsed = NativeAlarmSourceOverrideCsvParser.Parse(csv);

        var outcome = InstanceConfigure.BuildNativeAlarmSourceCsvImport(parsed, Sources());

        Assert.True(outcome.HasErrors);
        Assert.Empty(outcome.Rows);
        Assert.NotEmpty(outcome.Errors);
    }

    // ── Structural: InputFile + reuse-the-existing-save-path wiring ─────────

    [Fact]
    public void Page_WiresNativeAlarmSourceCsvInputFile_WithTestHooks()
    {
        var markup = InstanceConfigureMarkup;
        Assert.Contains("data-test=\"nas-csv-import-input\"", markup);
        Assert.Contains("data-test=\"nas-csv-import-result\"", markup);
        Assert.Contains("OnNativeAlarmSourceCsvImportSelectedAsync", markup);
        // Reuses the SHARED parser — no duplicated CSV parsing in the UI.
        Assert.Contains("NativeAlarmSourceOverrideCsvParser.Parse", markup);
        Assert.Contains("BuildNativeAlarmSourceCsvImport", markup);
    }

    [Fact]
    public void Import_AppliesViaTheExistingRepositoryUpsertPath()
    {
        var markup = InstanceConfigureMarkup;
        // The inline Save and the CSV import share one persistence helper.
        Assert.Contains("UpsertNativeOverrideCore", markup);
        Assert.Contains("ClearNativeOverrideCore", markup);
        // Same size cap as the attribute importer.
        Assert.Contains("MaxCsvImportBytes", markup);
    }
}