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

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

/// <summary>
/// Deferred-work row 27(b): <c>external-system create</c> and <c>external-system update</c>
/// must expose the per-system Store-and-Forward retry policy. Before this the fields existed
/// on the central entity but had NO management surface at all — the only way to set them was
/// a direct DB edit of <c>ExternalSystemDefinitions</c>.
/// <para>
/// The delay flag is named <c>--retry-delay-seconds</c> to match the sibling
/// <c>--timeout-seconds</c> on these same commands (the repo-wide CLI convention is an explicit
/// unit suffix), with <c>--retry-delay</c> kept as an alias.
/// </para>
/// </summary>
public class ExternalSystemRetryOptionTests
{
    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);

    [Theory]
    [InlineData("create")]
    [InlineData("update")]
    public void HasOptionalRetryPolicyOptions(string subcommand)
    {
        var cmd = Group().Subcommands.Single(c => c.Name == subcommand);

        var maxRetries = FindOption(cmd, "--max-retries");
        Assert.NotNull(maxRetries);
        Assert.False(maxRetries!.Required);

        var retryDelay = FindOption(cmd, "--retry-delay-seconds");
        Assert.NotNull(retryDelay);
        Assert.False(retryDelay!.Required);
    }

    [Fact]
    public void Create_ParsesRetryPolicyValues()
    {
        var parse = Group().Parse(new[]
        {
            "create", "--name", "Sys", "--endpoint-url", "http://x", "--auth-type", "none",
            "--max-retries", "8", "--retry-delay-seconds", "60",
        });

        Assert.Empty(parse.Errors);
        Assert.Equal(8, parse.GetValue<int?>("--max-retries"));
        Assert.Equal(60, parse.GetValue<int?>("--retry-delay-seconds"));
    }

    [Fact]
    public void Update_ParsesRetryPolicyValues()
    {
        var parse = Group().Parse(new[]
        {
            "update", "--id", "7", "--name", "Sys", "--endpoint-url", "http://x",
            "--auth-type", "none", "--max-retries", "3", "--retry-delay-seconds", "10",
        });

        Assert.Empty(parse.Errors);
        Assert.Equal(3, parse.GetValue<int?>("--max-retries"));
        Assert.Equal(10, parse.GetValue<int?>("--retry-delay-seconds"));
    }

    [Fact]
    public void RetryDelayAliasIsAccepted()
    {
        var parse = Group().Parse(new[]
        {
            "create", "--name", "Sys", "--endpoint-url", "http://x", "--auth-type", "none",
            "--retry-delay", "45",
        });

        Assert.Empty(parse.Errors);
        Assert.Equal(45, parse.GetValue<int?>("--retry-delay-seconds"));
    }

    /// <summary>
    /// Omission must stay distinguishable from an explicit 0 — that is what makes update's
    /// "omit to preserve" rule and create's "fall back to the engine default" rule work.
    /// </summary>
    [Fact]
    public void OmittedRetryPolicy_ParsesAsNull()
    {
        var parse = Group().Parse(new[]
        {
            "create", "--name", "Sys", "--endpoint-url", "http://x", "--auth-type", "none",
        });

        Assert.Empty(parse.Errors);
        Assert.Null(parse.GetValue<int?>("--max-retries"));
        Assert.Null(parse.GetValue<int?>("--retry-delay-seconds"));
    }
}