using UnityEngine;

namespace VketCloudGUITools.Serialization
{
    /// <summary>
    /// インポート時の進捗管理
    /// </summary>
    public class ImportProgress
    {
        /// <summary>
        /// デバッグ表示用のタグ
        /// </summary>
		private string _tag = string.Empty;

        /// <summary>
        /// デバッグ表示用の詳細
        /// </summary>
		private string _detail = string.Empty;

        /// <summary>
        /// 子タスクの重み
        /// </summary>
        private float _childProgressWeight = 0f;

        /// <summary>
        /// 子タスク
        /// </summary>
        private ImportProgress _childProgress = null;

        /// <summary>
        /// 親タスク
        /// </summary>
        private ImportProgress _parentProgress = null;

        /// <summary>
        /// 自己タスク完了量
        /// </summary>
		private float _selfProgress = 0f;

        public string Tag => _tag;
        public string Detail => _detail;

        public ImportProgress Root
        {
            get
            {
                if (_parentProgress == null)
                {
                    return this;
                }
                else
                {
                    return _parentProgress.Root;
                }
            }
        }

        public float SelfProgress
        {
            get => _selfProgress; set => _selfProgress = value;
        }

        public float TotalProgress
        {
            get
            {
                return (_childProgress == null) ?
                    SelfProgress :
                    SelfProgress + _childProgress.TotalProgress * ChildProgressWeight;
            }
        }

        public float ChildProgressWeight
        {
            get => _childProgressWeight;
            set => _childProgressWeight = value;
        }

        private ImportProgress()
        {
        }

        public ImportProgress(string tag, string detail, float childProgressWeight)
        {
            _tag = tag;
            _detail = detail;
            _childProgressWeight = childProgressWeight;
        }

        public void SetParent(ImportProgress parent)
        {
            DoAttachParent(parent);
        }

        public void Done()
        {
            if (_parentProgress != null)
            {
                _parentProgress.SelfProgress += _parentProgress.ChildProgressWeight;
                DoDetouchParent();
            }
        }

        private void DoAttachParent(ImportProgress newParent)
        {
            DoDetouchParent();

            if (newParent != null)
            {
                _parentProgress = newParent;
                _parentProgress._childProgress = this;
            }
        }

        private void DoDetouchParent()
        {
            if (_parentProgress != null)
            {
                _parentProgress._childProgress = null;
                _parentProgress = null;
            }
        }

        public string ToDebugInfo(string progressFormat = "P3")
        {
            string info = $"[{Tag}]{Detail} ... ({TotalProgress.ToString(progressFormat)})\n";
            if (_childProgress != null)
            {
                info += _childProgress.ToDebugInfo(progressFormat);
            }

            return info;
        }
    }
}