using System.CommandLine;
using ScadaLink.CLI.Commands;

namespace ScadaLink.CLI.Tests;

/// <summary>
/// Regression tests for CLI-014. The <c>Update*Command</c> records in Commons carry
/// non-nullable "core" fields (e.g. <c>string Name</c>, <c>string Protocol</c>,
/// <c>string Script</c>) — an update is a <em>whole-entity replace</em>, not a sparse
/// patch. The CLI must therefore mark those core flags as <c>Required</c>: making them
/// optional would let an omitted flag send <c>null</c>/empty and silently blank the
/// field server-side. These tests pin that contract so the documented surface and the
/// implemented surface stay aligned.
/// </summary>
public class UpdateCommandContractTests
{
    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 UpdateCommand(Command group, params string[] path)
    {
        var current = group;
        foreach (var segment in path)
            current = current.Subcommands.Single(c => c.Name == segment);
        return current;
    }

    private static void AssertRequired(Command command, params string[] requiredOptionNames)
    {
        foreach (var name in requiredOptionNames)
        {
            var option = command.Options.SingleOrDefault(o => o.Name == name);
            Assert.True(option != null, $"'{command.Name}' is missing expected option '{name}'.");
            Assert.True(option!.Required, $"'{command.Name}' option '{name}' must be Required (whole-replace contract).");
        }
    }

    [Fact]
    public void TemplateUpdate_CoreFieldsRequired()
        => AssertRequired(UpdateCommand(TemplateCommands.Build(Url, Format, Username, Password), "update"), "--name");

    [Fact]
    public void TemplateAttributeUpdate_CoreFieldsRequired()
        => AssertRequired(UpdateCommand(TemplateCommands.Build(Url, Format, Username, Password), "attribute", "update"), "--name", "--data-type");

    [Fact]
    public void TemplateAlarmUpdate_CoreFieldsRequired()
        => AssertRequired(UpdateCommand(TemplateCommands.Build(Url, Format, Username, Password), "alarm", "update"), "--name", "--trigger-type", "--priority");

    [Fact]
    public void TemplateScriptUpdate_CoreFieldsRequired()
        => AssertRequired(UpdateCommand(TemplateCommands.Build(Url, Format, Username, Password), "script", "update"), "--name", "--code");

    [Fact]
    public void SiteUpdate_CoreFieldsRequired()
        => AssertRequired(UpdateCommand(SiteCommands.Build(Url, Format, Username, Password), "update"), "--name");

    [Fact]
    public void DataConnectionUpdate_CoreFieldsRequired()
        => AssertRequired(UpdateCommand(DataConnectionCommands.Build(Url, Format, Username, Password), "update"), "--name", "--protocol");

    [Fact]
    public void ExternalSystemUpdate_CoreFieldsRequired()
        => AssertRequired(UpdateCommand(ExternalSystemCommands.Build(Url, Format, Username, Password), "update"), "--name", "--endpoint-url", "--auth-type");

    [Fact]
    public void NotificationUpdate_CoreFieldsRequired()
        => AssertRequired(UpdateCommand(NotificationCommands.Build(Url, Format, Username, Password), "update"), "--name", "--emails");

    [Fact]
    public void ApiMethodUpdate_CoreFieldsRequired()
        => AssertRequired(UpdateCommand(ApiMethodCommands.Build(Url, Format, Username, Password), "update"), "--script");

    [Fact]
    public void ExternalSystemMethodUpdate_IsGenuinelySparse_CoreFieldsOptional()
    {
        // UpdateExternalSystemMethodCommand is the one update record whose fields are
        // genuinely all-nullable, so its flags are correctly optional. Pin that too so
        // it is not mistakenly forced to Required.
        var update = UpdateCommand(ExternalSystemCommands.Build(Url, Format, Username, Password), "method", "update");
        foreach (var name in new[] { "--name", "--http-method", "--path" })
        {
            var option = update.Options.SingleOrDefault(o => o.Name == name);
            Assert.True(option != null, $"method update is missing option '{name}'.");
            Assert.False(option!.Required, $"method update option '{name}' should be optional (sparse-patch record).");
        }
    }
}