using Microsoft.EntityFrameworkCore;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.AdminUI.ScriptList;
using ZB.MOM.WW.OtOpcUa.Configuration;
using ZB.MOM.WW.OtOpcUa.Configuration.Entities;

namespace ZB.MOM.WW.OtOpcUa.AdminUI.Tests.ScriptList;

/// <summary>R04 P8: the <c>/scripts</c> list is a projection without source; source loads per dialog.</summary>
[Trait("Category", "Unit")]
public sealed class ScriptListQueriesTests
{
    private static OtOpcUaConfigDbContext NewDb(string name) =>
        new(new DbContextOptionsBuilder<OtOpcUaConfigDbContext>().UseInMemoryDatabase(name).Options);

    private static async Task<string> SeedAsync()
    {
        var name = Guid.NewGuid().ToString("N");
        await using var db = NewDb(name);
        db.Scripts.AddRange(
            new Script { ScriptId = "s-b", Name = "Beta", SourceCode = "return 2;", SourceHash = "hb" },
            new Script { ScriptId = "s-a", Name = "Alpha", SourceCode = "return 1;", SourceHash = "ha", Language = "CSharp" });
        await db.SaveChangesAsync();
        return name;
    }

    [Fact]
    public async Task LoadRowsAsync_returns_name_ordered_rows_without_source()
    {
        var name = await SeedAsync();
        await using var db = NewDb(name);

        var rows = await ScriptListQueries.LoadRowsAsync(db);

        rows.Select(r => r.ScriptId).ShouldBe(["s-a", "s-b"]);
        rows[0].ShouldBe(new ScriptListRow("s-a", "Alpha", "CSharp", "ha"));
        // The row type has no source member at all — the list cannot load it by accident.
        typeof(ScriptListRow).GetProperty("SourceCode").ShouldBeNull();
    }

    [Fact]
    public async Task LoadSourceAsync_returns_one_scripts_source_or_null_when_gone()
    {
        var name = await SeedAsync();
        await using var db = NewDb(name);

        (await ScriptListQueries.LoadSourceAsync(db, "s-b")).ShouldBe("return 2;");
        (await ScriptListQueries.LoadSourceAsync(db, "missing")).ShouldBeNull();
    }

    [Fact]
    public void Scripts_page_uses_the_projection()
    {
        var src = AdminUiSource.Read("Components", "Pages", "Scripts.razor");
        src.ShouldContain("ScriptListQueries.LoadRowsAsync(");
        src.ShouldNotContain("List<Script>");
    }

    [Fact]
    public void Source_fetch_failure_is_shown_in_the_dialog_not_thrown()
    {
        // Review r0 M7 source pin: the fetch sits inside a try whose catch sets _sourceError.
        var src = AdminUiSource.Read("Components", "Pages", "Scripts.razor");
        var fetch = src.IndexOf("ScriptListQueries.LoadSourceAsync(", StringComparison.Ordinal);
        var tryAt = src.LastIndexOf("try", fetch, StringComparison.Ordinal);
        var catchAt = src.IndexOf("catch (Exception ex)", fetch, StringComparison.Ordinal);
        tryAt.ShouldBeGreaterThan(src.IndexOf("private async Task ShowSource", StringComparison.Ordinal));
        catchAt.ShouldBeGreaterThan(fetch);
        src.IndexOf("_sourceError = ", catchAt, StringComparison.Ordinal).ShouldBeGreaterThan(catchAt);
        src.ShouldContain("@_sourceError");
    }
}