using System.CommandLine;
using ZB.MOM.WW.ScadaBridge.CLI.Commands;

namespace ZB.MOM.WW.ScadaBridge.CLI.Tests.Commands;

/// <summary>
/// Scaffold tests for the <c>scadabridge audit</c> command group (Audit Log).
/// Verifies the parent command exists with its subcommands and that every leaf
/// has an action wired. Also covers <c>backfill-source-node</c>.
/// </summary>
public class AuditCommandsScaffoldTests
{
    private static readonly Option<string> Url = new("--url") { Recursive = true };
    private static readonly Option<string> Username = new("--username") { Recursive = true };
    private static readonly Option<string> Password = new("--password") { Recursive = true };
    private static readonly Option<string> Format = CliOptions.CreateFormatOption();

    private static Command BuildAudit()
        => AuditCommands.Build(Url, Format, Username, Password);

    /// <summary>Verifies that the command group is named <c>audit</c>.</summary>
    [Fact]
    public void Audit_Command_IsNamedAudit()
    {
        var audit = BuildAudit();
        Assert.Equal("audit", audit.Name);
        Assert.False(string.IsNullOrWhiteSpace(audit.Description));
    }

    /// <summary>Verifies that the audit group exposes the query, export, tree, verify-chain, verify-heads, backfill-source-node and archive subcommands.</summary>
    [Fact]
    public void Audit_HasSevenSubcommands_QueryExportTreeVerifyChainVerifyHeadsBackfillSourceNodeArchive()
    {
        var audit = BuildAudit();
        var names = audit.Subcommands.Select(c => c.Name).OrderBy(n => n).ToArray();
        Assert.Equal(
            new[] { "archive", "backfill-source-node", "export", "query", "tree", "verify-chain", "verify-heads" },
            names);
    }

    /// <summary>Verifies that the audit help text lists every subcommand.</summary>
    [Fact]
    public void Audit_HelpText_ListsAllSubcommands()
    {
        var root = new RootCommand();
        root.Add(BuildAudit());

        var output = new StringWriter();
        var exit = root.Parse(new[] { "audit", "--help" })
            .Invoke(new InvocationConfiguration { Output = output });

        Assert.Equal(0, exit);
        var text = output.ToString();
        Assert.Contains("query", text);
        Assert.Contains("export", text);
        Assert.Contains("tree", text);
        Assert.Contains("verify-chain", text);
        Assert.Contains("backfill-source-node", text);
    }

    /// <summary>Verifies that every leaf command in the audit group has an action wired.</summary>
    [Fact]
    public void Audit_EveryLeafCommand_HasAnAction()
    {
        // `archive` is a group (list / verify, ScadaBridge#42; cleanup, ScadaBridge#109): check its leaves, not it.
        var audit = BuildAudit();
        var leaves = audit.Subcommands.SelectMany(c => c.Subcommands.Count == 0 ? [c] : c.Subcommands).ToList();
        Assert.Equal(9, leaves.Count); // + verify-heads (ScadaBridge#107), archive cleanup (ScadaBridge#109)
        Assert.All(leaves, sub =>
            Assert.True(sub.Action != null, $"Leaf command '{sub.Name}' has no action."));
    }
}