using SQLInsight.Core.Findings;
using SQLInsight.Core.Instances;
using SQLInsight.Rules.Engine;
using SQLInsight.Rules.Lifecycle;

namespace SQLInsight.Rules.Tests;

public class SupportLifecycleRuleTests
{
    private static readonly SupportLifecycleRule Rule = new(SupportLifecycleCatalog.LoadEmbedded());

    private static readonly DateTimeOffset Today = new(2026, 9, 29, 0, 0, 0, TimeSpan.Zero);

    [Theory]
    [InlineData("8.00.2039")]
    [InlineData("9.00.5000.00")]
    [InlineData("10.50.6000.34")]
    [InlineData("12.0.6024.0")]
    [InlineData("13.0.6300.2")]
    public void Out_of_support_releases_are_critical(string version)
    {
        var evaluation = Rule.Evaluate(TestInstances.Context(version, Today));

        Assert.Equal(RuleOutcome.Findings, evaluation.Outcome);
        Assert.Equal(Severity.Critical, Assert.Single(evaluation.Findings).Severity);
    }

    [Theory]
    [InlineData("2026-09-29", Severity.Medium)] // 378 days left
    [InlineData("2026-10-12", Severity.High)]   // exactly 365 days left
    [InlineData("2027-10-12", Severity.High)]   // last day of support
    [InlineData("2027-10-13", Severity.Critical)]
    public void Sql2017_escalates_as_extended_support_ends(string date, Severity expected)
    {
        // SQL Server 2017 extended support ends 2027-10-12.
        var now = DateTimeOffset.Parse(date + "T12:00:00Z", System.Globalization.CultureInfo.InvariantCulture);

        var evaluation = Rule.Evaluate(TestInstances.Context("14.0.3456.2", now));

        Assert.Equal(expected, Assert.Single(evaluation.Findings).Severity);
    }

    [Fact]
    public void Extended_support_further_out_is_medium()
    {
        // SQL Server 2019 left mainstream support 2025-02-28; extended runs to 2030.
        var evaluation = Rule.Evaluate(TestInstances.Context("15.0.4355.3", Today));

        Assert.Equal(Severity.Medium, Assert.Single(evaluation.Findings).Severity);
    }

    [Fact]
    public void Mainstream_support_passes()
    {
        var evaluation = Rule.Evaluate(TestInstances.Context("16.0.4135.4", Today));

        Assert.Equal(RuleOutcome.Passed, evaluation.Outcome);
    }

    [Fact]
    public void Release_without_published_dates_is_not_measurable()
    {
        var evaluation = Rule.Evaluate(TestInstances.Context("17.0.1000.7", Today));

        Assert.Equal(RuleOutcome.NotMeasurable, evaluation.Outcome);
    }

    [Fact]
    public void Unknown_future_release_is_not_measurable()
    {
        var evaluation = Rule.Evaluate(TestInstances.Context("18.0.100.1", Today));

        Assert.Equal(RuleOutcome.NotMeasurable, evaluation.Outcome);
        Assert.Contains("Opdater", evaluation.Reason, StringComparison.Ordinal);
    }

    [Fact]
    public void Runs_on_sql2000_because_it_needs_no_capabilities()
    {
        Assert.Empty(Rule.RequiredCapabilities);
    }

    [Fact]
    public void Catalog_covers_every_known_release()
    {
        var catalog = SupportLifecycleCatalog.LoadEmbedded();

        foreach (var release in Enum.GetValues<SqlServerRelease>().Where(r => r != SqlServerRelease.Unknown))
        {
            Assert.NotNull(catalog.Find(release));
        }
    }
}