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

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

/// <summary>
/// PLAN-06 Task 11: <c>external-system create</c> and <c>external-system update</c>
/// must expose an optional <c>--timeout-seconds</c> (<see cref="int"/>?) flag that
/// carries the per-system ESG HTTP timeout. Omitting it preserves the existing value
/// (update) / uses the gateway default (create).
/// </summary>
public class ExternalSystemTimeoutOptionTests
{
    private static readonly Option<string> Url = new("--url") { Recursive = true };
    private static readonly Option<string> Format = new("--format") { Recursive = true };
    private static readonly Option<string> Username = new("--username") { Recursive = true };
    private static readonly Option<string> Password = new("--password") { Recursive = true };

    private static Command Group() => ExternalSystemCommands.Build(Url, Format, Username, Password);

    private static Option? FindOption(Command command, string name)
        => command.Options.SingleOrDefault(o => o.Name == name);

    [Fact]
    public void Create_HasOptionalTimeoutSecondsOption()
    {
        var create = Group().Subcommands.Single(c => c.Name == "create");
        var option = FindOption(create, "--timeout-seconds");
        Assert.NotNull(option);
        Assert.False(option!.Required);
    }

    [Fact]
    public void Update_HasOptionalTimeoutSecondsOption()
    {
        var update = Group().Subcommands.Single(c => c.Name == "update");
        var option = FindOption(update, "--timeout-seconds");
        Assert.NotNull(option);
        Assert.False(option!.Required);
    }

    [Fact]
    public void Create_ParsesTimeoutSecondsValue()
    {
        var parse = Group().Parse(new[]
        {
            "create", "--name", "Sys", "--endpoint-url", "http://x",
            "--auth-type", "none", "--timeout-seconds", "15",
        });

        Assert.Empty(parse.Errors);
        Assert.Equal(15, parse.GetValue<int?>("--timeout-seconds"));
    }

    [Fact]
    public void Update_ParsesTimeoutSecondsValue()
    {
        var parse = Group().Parse(new[]
        {
            "update", "--id", "7", "--name", "Sys", "--endpoint-url", "http://x",
            "--auth-type", "none", "--timeout-seconds", "20",
        });

        Assert.Empty(parse.Errors);
        Assert.Equal(20, parse.GetValue<int?>("--timeout-seconds"));
    }

    [Fact]
    public void Create_OmittedTimeoutSeconds_ParsesWithoutError()
    {
        var parse = Group().Parse(new[]
        {
            "create", "--name", "Sys", "--endpoint-url", "http://x", "--auth-type", "none",
        });

        Assert.Empty(parse.Errors);
        Assert.Null(parse.GetValue<int?>("--timeout-seconds"));
    }
}
