namespace Spectre.Console.Cli;

/// <summary>
/// Base class for a command.
/// </summary>
/// <typeparam name="TSettings">The settings type.</typeparam>
/// <seealso cref="AsyncCommand{TSettings}"/>
public abstract class Command<TSettings> : ICommand<TSettings>
    where TSettings : CommandSettings
{
    /// <summary>
    /// Validates the specified settings and remaining arguments.
    /// </summary>
    /// <param name="context">The command context.</param>
    /// <param name="settings">The settings.</param>
    /// <returns>The validation result.</returns>
    public virtual ValidationResult Validate([NotNull] CommandContext context, [NotNull] TSettings settings)
    {
        return ValidationResult.Success();
    }

    /// <summary>
    /// Executes the command.
    /// </summary>
    /// <param name="context">The command context.</param>
    /// <param name="settings">The settings.</param>
    /// <returns>An integer indicating whether or not the command executed successfully.</returns>
    public abstract int Execute([NotNull] CommandContext context, [NotNull] TSettings settings);

    /// <inheritdoc/>
    ValidationResult ICommand.Validate(CommandContext context, CommandSettings settings)
    {
        return Validate(context, (TSettings)settings);
    }

    /// <inheritdoc/>
    Task<int> ICommand.Execute(CommandContext context, CommandSettings settings)
    {
        Debug.Assert(settings is TSettings, "Command settings is of unexpected type.");
        return Task.FromResult(Execute(context, (TSettings)settings));
    }

    /// <inheritdoc/>
    Task<int> ICommand<TSettings>.Execute(CommandContext context, TSettings settings)
    {
        return Task.FromResult(Execute(context, settings));
    }
}