using Xunit;

using StellaOps.TestKit;
namespace StellaOps.TimelineIndexer.Tests;

public sealed class TimelineSchemaTests
{
    private static string FindMigrationPath()
    {
        var dir = AppContext.BaseDirectory;
        for (var i = 0; i < 12 && dir is not null; i++)
        {
            var candidate = Path.Combine(dir, "Db", "Migrations", "001_initial_schema.sql");
            if (File.Exists(candidate))
            {
                return candidate;
            }

            var infraCandidate = Path.Combine(dir, "StellaOps.TimelineIndexer.Infrastructure", "Db", "Migrations", "001_initial_schema.sql");
            if (File.Exists(infraCandidate))
            {
                return infraCandidate;
            }

            dir = Directory.GetParent(dir)?.FullName;
        }

        throw new FileNotFoundException("Expected migration file was not found after traversing upward.", "(Db/Migrations/001_initial_schema.sql)");
    }

    private static string ReadMigrationSql()
    {
        var path = FindMigrationPath();
        return File.ReadAllText(path);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void MigrationFile_Exists()
    {
        var path = FindMigrationPath();
        Assert.True(File.Exists(path), $"Migration script missing at {path}");
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void Migration_EnablesRlsPolicies()
    {
        var sql = ReadMigrationSql();

        Assert.Contains("timeline_app.require_current_tenant", sql, StringComparison.Ordinal);
        Assert.Contains("timeline_events_isolation", sql, StringComparison.Ordinal);
        Assert.Contains("timeline_event_details_isolation", sql, StringComparison.Ordinal);
        Assert.Contains("timeline_event_digests_isolation", sql, StringComparison.Ordinal);
        Assert.Contains("ENABLE ROW LEVEL SECURITY", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void Migration_DefinesUniqueEventConstraint()
    {
        var sql = ReadMigrationSql();

        Assert.Contains("UNIQUE (tenant_id, event_id)", sql, StringComparison.Ordinal);
        Assert.Contains("event_seq      bigserial", sql, StringComparison.Ordinal);
    }
}