using System;

namespace TBL.GodotSharp.Content
{
    public partial class PackageNode
    {
        /// <summary>
        /// 包信息
        /// </summary>
        public struct Info
        {
            /// <summary>
            /// 包名称
            /// </summary>
            public readonly string Name;

            /// <summary>
            /// 作者信息
            /// </summary>
            public readonly string AuthorInfo;
            
            /// <summary>
            /// 版本信息
            /// </summary>
            public readonly Version VersionInfo;

            public Info(string name, string author, string version)
            {
                Name = name;
                AuthorInfo = author;
                if (!Version.TryParse(version, out VersionInfo))
                    VersionInfo = new Version();
            }

            public Info(string name, string author, Version version)
            {
                Name = name;
                AuthorInfo = author;
                VersionInfo = version;
            }

            /// <summary>
            /// 判断本信息能否满足 <paramref name="target"/> 的版本要求
            /// </summary>
            /// <param name="target">依赖项信息</param>
            public bool IsCompatibleWith(DependencyInfo target)
            {
                return Content.IsCompatibleWith(VersionInfo, target.Target.VersionInfo,
                    (target.Flags & DependencyInfo.FlagsEnum.Strict) != 0 ? 1 : 0);
            }

            public override string ToString() => $"[{Name}][{AuthorInfo}][{VersionInfo}]";
        }

        /// <summary>
        /// 包依赖信息
        /// </summary>
        public struct DependencyInfo
        {
            /// <summary>
            /// 依赖目标
            /// </summary>
            public readonly Info Target;

            /// <summary>
            /// 依赖属性
            /// </summary>
            public readonly FlagsEnum Flags;
            
            /// <summary>
            /// 依赖项属性
            /// </summary>
            [Flags]
            public enum FlagsEnum
            {
                /// <summary>
                /// 无属性
                /// </summary>
                None,
                    
                /// <summary>
                /// 非必须依赖项
                /// </summary>
                Unnecessary,

                /// <summary>
                /// 严格（次版本号）兼容依赖项
                /// </summary>
                Strict
            }

            public DependencyInfo(Info target, FlagsEnum flags = FlagsEnum.None)
            {
                Target = target;
                Flags = flags;
            }
        }
    }
}