using System.Collections.Generic;
using System.Linq;
using DeveloperAchievements.Activities;

namespace DeveloperAchievements.Achievements
{
    
    public class AchievementGenerationResult
    {
        public IEnumerable<Achievement> GeneratedAchievements { get; set; }

        public bool HasGeneratedAchievements
        {
            get { return GeneratedAchievements != null && GeneratedAchievements.Count() > 0; }
        }

        public AchievementGenerationResult()
        {
            GeneratedAchievements = new Achievement[] {};
        }
    }

    public interface IAchievementGenerator
    {
        /// <summary>
        /// Generates Achievements for a given Developer Activity catalyst.
        /// </summary>
        /// <param name="catalyst">The developer activity that triggered the Achievement generation</param>
        /// <param name="history">The developer's activity history</param>
        /// <returns>An award generation result that contains the generated awards for the catalyst.</returns>
        AchievementGenerationResult Generate(DeveloperActivity catalyst, DeveloperHistory history);
    }

}