using SQLInsight.Core.Data;

namespace SQLInsight.Core.Tests;

public class PrivilegeAnalysisTests
{
    private static readonly DateTimeOffset Then = new(2026, 9, 29, 10, 0, 0, TimeSpan.Zero);
    private static readonly DateTimeOffset Now = Then.AddMinutes(15);

    private static PrivilegeSnapshot Snapshot(params PrivilegedPrincipal[] principals) => new() { CapturedAt = Now, Principals = principals };

    private static PrivilegedPrincipal Group(string name, params string[] members) =>
        new(name, "Windows-gruppe", "sysadmin", false, members.Select(m => new GroupMember(m, null, true)).ToList());

    [Fact]
    public void New_and_removed_direct_members_are_found_by_privilege_and_name()
    {
        var before = Snapshot(new("sa", "SQL-login", "sysadmin", false), new("KUNDE\\anne", "Windows-login", "dbcreator", false));
        var after = Snapshot(new("sa", "SQL-login", "sysadmin", false), new("KUNDE\\anne", "Windows-login", "sysadmin", false));

        var changes = PrivilegeAnalysis.Diff(before, after, Now);

        Assert.Equal(2, changes.Count);
        Assert.Contains(changes, c => c is { Kind: PrivilegeAnalysis.Added, Privilege: "sysadmin", Principal: "KUNDE\\anne", ViaGroup: null });
        Assert.Contains(changes, c => c is { Kind: PrivilegeAnalysis.Removed, Privilege: "dbcreator", Principal: "KUNDE\\anne" });
    }

    [Fact]
    public void People_added_to_an_unfolded_group_are_new_members_via_the_group()
    {
        var before = Snapshot(Group("KUNDE\\SQL-Admins", "KUNDE\\anne"));
        var after = Snapshot(Group("KUNDE\\SQL-Admins", "KUNDE\\anne", "KUNDE\\bo"));

        var change = Assert.Single(PrivilegeAnalysis.Diff(before, after, Now));

        Assert.Equal((PrivilegeAnalysis.Added, "KUNDE\\bo", "KUNDE\\SQL-Admins", "Windows-bruger"), (change.Kind, change.Principal, change.ViaGroup, change.PrincipalType));
    }

    [Fact]
    public void A_group_that_could_not_be_unfolded_does_not_look_like_everyone_left()
    {
        var before = Snapshot(Group("KUNDE\\SQL-Admins", "KUNDE\\anne", "KUNDE\\bo"));
        var after = Snapshot(new PrivilegedPrincipal("KUNDE\\SQL-Admins", "Windows-gruppe", "sysadmin", false, ExpansionError: "Active Directory svarede ikke"));

        Assert.Empty(PrivilegeAnalysis.Diff(before, after, Now));
    }

    [Fact]
    public void Who_and_when_comes_from_the_matching_trace_event()
    {
        var changes = new[]
        {
            new PrivilegeChange(Now, PrivilegeAnalysis.Added, "sysadmin", "ny_admin", "SQL-login"),
            new PrivilegeChange(Now, PrivilegeAnalysis.Removed, "dbcreator", "gammel", "SQL-login"),
            new PrivilegeChange(Now, PrivilegeAnalysis.Added, "sysadmin", "KUNDE\\bo", "Windows-bruger", "KUNDE\\SQL-Admins"),
        };
        var events = new[]
        {
            new TraceSecurityEvent(Then.AddMinutes(3), 108, 1, "KUNDE\\it-chef", "ny_admin", "sysadmin"),
            new TraceSecurityEvent(Then.AddMinutes(5), 108, 1, "KUNDE\\vikar", "ny_admin", "sysadmin"),        // the latest wins
            new TraceSecurityEvent(Then.AddMinutes(6), 108, 1, "KUNDE\\vikar", "ny_admin", "serveradmin"),     // other role
            new TraceSecurityEvent(Now.AddMinutes(5), 108, 1, "KUNDE\\senere", "ny_admin", "sysadmin"),        // after detection
            new TraceSecurityEvent(Then.AddMinutes(7), 108, 2, "KUNDE\\it-chef", "gammel", "dbcreator"),
        };

        var enriched = PrivilegeAnalysis.Enrich(changes, events);

        Assert.Equal(("KUNDE\\vikar", Then.AddMinutes(5)), (enriched[0].ChangedBy, enriched[0].ChangedAt));
        Assert.Equal("KUNDE\\it-chef", enriched[1].ChangedBy);
        Assert.Null(enriched[2].ChangedBy); // a change in Active Directory is not in SQL Server's trace
    }

    [Fact]
    public void Accounts_count_people_in_groups_once_and_leave_out_services_and_disabled()
    {
        var snapshot = Snapshot(
            new("sa", "SQL-login", "sysadmin", true),
            new("KUNDE\\anne", "Windows-login", "sysadmin", false),
            new("NT SERVICE\\MSSQLSERVER", "Windows-login", "sysadmin", false),
            new("KUNDE\\SQL-Admins", "Windows-gruppe", "sysadmin", false,
                [new("KUNDE\\anne", "Anne", true), new("KUNDE\\bo", "Bo", true), new("KUNDE\\fratraadt", null, false), new("KUNDE\\SRV01$", null, true)]),
            new("KUNDE\\DBA", "Windows-gruppe", "sysadmin", false, ExpansionError: "timeout"),
            new("KUNDE\\cecilie", "Windows-login", "dbcreator", false));

        var accounts = PrivilegeAnalysis.Accounts(snapshot, PrivilegeAnalysis.Sysadmin);

        Assert.Equal(["KUNDE\\anne", "KUNDE\\bo"], accounts.Select(a => a.Account));
        Assert.Equal(PrivilegeAnalysis.Direct, accounts[0].Source);
        Assert.Equal("KUNDE\\SQL-Admins", accounts[1].Source);
        Assert.Equal("KUNDE\\DBA", Assert.Single(PrivilegeAnalysis.UnfoldedGroupsMissing(snapshot, PrivilegeAnalysis.Sysadmin)).Name);
    }

    [Theory]
    [InlineData(@"NT SERVICE\SQLSERVERAGENT", true)]
    [InlineData(@"NT AUTHORITY\SYSTEM", true)]
    [InlineData("##MS_PolicyTsqlExecutionLogin##", true)]
    [InlineData(@"KUNDE\gmsa-sql$", true)]
    [InlineData(@"KUNDE\anne", false)]
    [InlineData("sa", false)]
    public void Service_identities_are_not_people(string name, bool expected) => Assert.Equal(expected, PrivilegeAnalysis.IsServiceIdentity(name));

    [Theory]
    [InlineData(@"C:\Program Files\Microsoft SQL Server\MSSQL16.MSSQLSERVER\MSSQL\Log\log_123.trc", @"C:\Program Files\Microsoft SQL Server\MSSQL16.MSSQLSERVER\MSSQL\Log\log.trc")]
    [InlineData("/var/opt/mssql/log/log_7.trc", "/var/opt/mssql/log/log.trc")]
    public void Trace_files_are_read_from_the_first_rollover_file(string current, string expected) =>
        Assert.Equal(expected, PrivilegeAnalysis.TraceFileBase(current));

    [Fact]
    public void Fingerprints_are_stable_short_and_free_of_names()
    {
        var a = PrivilegeAnalysis.Fingerprint("KUNDE\\anne|");
        Assert.Equal(12, a.Length);
        Assert.Equal(a, PrivilegeAnalysis.Fingerprint("kunde\\ANNE|"));
        Assert.DoesNotContain("anne", a, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task Without_active_directory_groups_fail_with_the_reason()
    {
        var expansion = await new NoGroupResolver("Agenten kører ikke på Windows").ExpandAsync("KUNDE\\SQL-Admins", CancellationToken.None);

        Assert.Empty(expansion.Members);
        Assert.Equal("Agenten kører ikke på Windows", expansion.Error);
    }
}