using System.Collections.Generic;
using System.Linq;

namespace wms.service.Extensions.LayerPacking.model
{
    /// <summary>
    /// 层配装箱约束条件
    /// </summary>
    public class LayerPackingConstraints
    {
        /// <summary>
        /// 产品目标值
        /// </summary>
        public decimal P { get; set; }

        /// <summary>
        /// 产品偏差范围
        /// </summary>
        public decimal P1 { get; set; }

        /// <summary>
        /// 箱总扭转目标值
        /// </summary>
        private decimal? _x;

        /// <summary>
        /// 层总扭转目标值
        /// </summary>
        private decimal? _c;

        /// <summary>
        /// 箱总产品数
        /// </summary>
        private int _productsPerBox;

        /// <summary>
        /// 箱总产品数
        /// </summary>
        public int ProductsPerBox
        {
            get => _productsPerBox;
            set
            {
                _productsPerBox = value;
                // 重新计算相关值
                _x = null;
                _c = null;
            }
        }

        /// <summary>
        /// 层总产品数
        /// </summary>
        private const int PRODUCTS_PER_LAYER = 12;

        /// <summary>
        /// 层总产品数
        /// </summary>
        public int ProductsPerLayer => PRODUCTS_PER_LAYER;

        /// <summary>
        /// 箱总层数
        /// </summary>
        public int LayersPerBox => ProductsPerBox / PRODUCTS_PER_LAYER;

        /// <summary>
        /// 箱总扭转目标值
        /// </summary>
        public decimal X
        {
            get => _x ?? P * ProductsPerBox;
            set => _x = value;
        }

        /// <summary>
        /// 箱总扭转目标偏差范围
        /// </summary>
        public decimal X1 { get; set; }

        /// <summary>
        /// 层总扭转目标值
        /// </summary>
        public decimal C
        {
            get => _c ?? P * PRODUCTS_PER_LAYER;
            set => _c = value;
        }

        /// <summary>
        /// 层总扭转目标偏差范围
        /// </summary>
        public decimal C1 { get; set; }

        /// <summary>
        /// 最大焊点盘数
        /// </summary>
        public int SolderMaxCount { get; set; }

        /// <summary>
        /// 最大焊点数
        /// </summary>
        public int PerSolderMaxCount { get; set; }

        /// <summary>
        /// 最小产品扭转目标值
        /// </summary>
        public decimal MinProductValue => P - P1;

        /// <summary>
        /// 最大产品扭转目标值
        /// </summary>
        public decimal MaxProductValue => P + P1;

        /// <summary>
        /// 是产品最小扭转目标值
        /// </summary>
        public bool IsAtMinTarget { get; private set; }

        /// <summary>
        /// 是产品最大扭转目标值
        /// </summary>
        public bool IsAtMaxTarget { get; private set; }

        /// <summary>
        /// 最小箱总目标值
        /// </summary>
        public decimal MinBoxTotal
        {
            get
            {
                if (X == P - P1 * ProductsPerBox)
                    return X;
                if (X == P + P1 * ProductsPerBox)
                    return X - X1;
                return X - X1;
            }
        }

        /// <summary>
        /// 最大箱总目标值
        /// </summary>
        public decimal MaxBoxTotal
        {
            get
            {
                if (X == P + P1 * ProductsPerBox)
                    return X;
                if (X == P - P1 * ProductsPerBox)
                    return X + X1;
                return X + X1;
            }
        }

        /// <summary>
        /// 最小层总目标值
        /// </summary>
        public decimal MinLayerTotal
        {
            get
            {
                if (C == P - P1 * PRODUCTS_PER_LAYER)
                    return C;
                if (C == P + P1 * PRODUCTS_PER_LAYER)
                    return C - C1;
                return C - C1;
            }
        }

        /// <summary>
        /// 最大层总目标值
        /// </summary>
        public decimal MaxLayerTotal
        {
            get
            {
                if (C == P + P1 * PRODUCTS_PER_LAYER)
                    return C;
                if (C == P - P1 * PRODUCTS_PER_LAYER)
                    return C + C1;
                return C + C1;
            }
        }

        /// <summary>
        /// 更新箱层目标值
        /// </summary>
        /// <param name="products"></param>
        public void UpdateTargetValues(List<LayerPackingProduct> products)
        {
            if (products == null || !products.Any()) return;

            decimal avgValue = products.Average(p => p.TorsChkValue);
            decimal effectiveProductTarget; // 有效产品目标值  --计算箱层目标值时使用的产品目标值

            if (avgValue <= MinProductValue)
            {
                effectiveProductTarget = MinProductValue;
                IsAtMinTarget = true;
                IsAtMaxTarget = false;
            }
            else if (avgValue >= MaxProductValue)
            {
                effectiveProductTarget = MaxProductValue;
                IsAtMinTarget = false;
                IsAtMaxTarget = true;
            }
            else
            {
                effectiveProductTarget = avgValue;
                IsAtMinTarget = false;
                IsAtMaxTarget = false;
            }

            _x = effectiveProductTarget * ProductsPerBox;
            _c = effectiveProductTarget * PRODUCTS_PER_LAYER;
            X1 = P1 * ProductsPerBox;
            C1 = P1 * PRODUCTS_PER_LAYER;
        }

        /// <summary>
        /// 获取焊点在装箱中的约束方案
        /// </summary>
        /// <returns></returns>
        public SolderConstraintType GetSolderConstraintType()
        {
            if (SolderMaxCount <= 0) return SolderConstraintType.NoConstraint;
            else if (PerSolderMaxCount <= 0) return SolderConstraintType.OnlyProductCount;
            else return SolderConstraintType.BothConstraints;
        }
    }

    /// <summary>
    /// 焊点约束条件
    /// </summary>
    public enum SolderConstraintType
    {
        /// <summary>
        /// 无约束条件
        /// </summary>
        NoConstraint,

        /// <summary>
        /// 仅产品数
        /// </summary>
        OnlyProductCount,

        /// <summary>
        /// 同时满足产品数和焊点数
        /// </summary>
        BothConstraints
    }
}