using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Volo.Abp;
using Volo.Abp.Domain.Repositories;
using Volo.Abp.Domain.Services;
using Win_in.Sfs.Shared.Domain;
using Win_in.Sfs.Shared.Domain.Shared;

namespace Win_in.Sfs.Basedata.Domain;

public class BomManager : DomainService, IBomManager
{
    private readonly IBomRepository _repository;
    private readonly IItemBasicRepository _itemBasicRepository;

    public BomManager(IBomRepository repository, IItemBasicRepository itemBasicRepository)
    {
        _repository = repository;
        _itemBasicRepository = itemBasicRepository;
    }

    /// <summary>
    /// 获取对应的Bom信息
    /// </summary>
    /// <param name="productItemCode"></param>
    /// <param name="validTime"></param>
    /// <param name="isRecursive"></param>
    /// <returns></returns>
    public virtual async Task<List<Bom>> GetRecursiveListAsync(string productItemCode, DateTime validTime, bool isRecursive = true)
    {
        List<Bom> totalBoms = new List<Bom>();

        var boms = await _repository.GetListAsync(p => p.Product == productItemCode
                                                       && (p.BeginTime <= validTime)
                                                       && (p.EndTime >= validTime)).ConfigureAwait(false);

        if (isRecursive)
        {
            foreach (var bom in boms)
            {
                if (bom.Component == bom.Product)
                {
                    totalBoms.AddRange(boms);

                    continue;
                }

                //获取下级Bom，如果有就继续，没有就完事
                await GetListWithValidTimeAsync(totalBoms, bom, validTime, 1).ConfigureAwait(false);
            }
        }
        else
        {
            foreach (var bom in boms)
            {

                var item = await _itemBasicRepository.FindAsync(p => p.Code == bom.Component).ConfigureAwait(false);
                if (item is { IsPhantom: true })
                {
                    await GetRecursiveListAsync(bom.Component, validTime, isRecursive).ConfigureAwait(false);
                }
                else
                {
                    totalBoms.Add(bom);
                };
            }

        }

        return totalBoms;
    }

    /// <summary>
    /// 递归获取bom
    /// </summary>
    /// <param name="totalBoms"></param>
    /// <param name="bom"></param>
    /// <param name="validTime"></param>
    /// <param name="multipleQty"></param>
    /// <returns></returns>
    private async Task GetListWithValidTimeAsync(List<Bom> totalBoms, Bom bom, DateTime validTime, decimal multipleQty)
    {

        var subboms = await _repository.GetListAsync(p => p.Product == bom.Product
                                                          && p.BeginTime <= validTime
                                                          && p.EndTime >= validTime).ConfigureAwait(false);

        if (subboms == null || subboms.Count == 0)
        {
            //根据bom多层放大倍数，第一次传过来的是1
            bom.ComponentQty *= multipleQty;
            totalBoms.Add(bom);
            return;
        }
        else
        {
            foreach (var subbom in subboms)
            {
                //获取下级Bom，如果有就继续，没有就完事
                await GetListWithValidTimeAsync(totalBoms, subbom, validTime, subbom.ComponentQty * multipleQty).ConfigureAwait(false);
            }

        }
    }

    /// <summary>
    /// 执行导入
    /// </summary>
    public virtual async Task ImportDataAsync(List<Bom> mergeEntities, List<Bom> deleteEntities = null)
    {
        if (deleteEntities != null && deleteEntities.Count > 0)
        {
            await _repository.BulkDeleteAsync(deleteEntities).ConfigureAwait(false);
        }

        await _repository.BulkMergeAsync(mergeEntities).ConfigureAwait(false);
    }

    /// <summary>
    /// 所有子物料号
    /// </summary>
    /// <param name="product"></param>
    /// <returns></returns>
    public virtual async Task<List<Bom>> GetListOfProductAsync(string product)
    {
        return await _repository.GetListAsync(p => p.Product == product).ConfigureAwait(false);
    }

    public virtual async Task<List<Bom>> GetListWithPhantomItemAsync(string productItemCode, string mfgOp, DateTime validTime, bool onlyFromProductionPlan)
    {
        var where = BuildExpression(productItemCode, mfgOp, validTime, onlyFromProductionPlan);

        var entities = await (await _repository.GetDbSetAsync().ConfigureAwait(false)).AsNoTracking().Where(where).ToListAsync().ConfigureAwait(false);
        var phantomItemBoms = await GetPhantomItemBomsAsync(entities, mfgOp, validTime, onlyFromProductionPlan).ConfigureAwait(false);

        return phantomItemBoms;
    }
    private static Expression<Func<Bom, bool>> BuildExpression(string productItemCode, string mfgOp, DateTime validTime, bool onlyFromProductionPlan)
    {
        Expression<Func<Bom, bool>> where = p => p.Product == productItemCode
                                                 // && p.MFGOp == mfgOp
                                                 && p.ComponentQty > 0
                                                 && (p.BeginTime <= validTime)
                                                 && (p.EndTime >= validTime);

        if (onlyFromProductionPlan)
        {
            where = where.And(p => p.DistributionType == EnumDistributionType.FromProductionPlan);
        }

        return where;
    }

    private async Task<List<Bom>> GetPhantomItemBomsAsync(List<Bom> productBoms, string mfgOp, DateTime validTime, bool onlyFromProductionPlan)
    {
        var result = new List<Bom>();

        foreach (var bom in productBoms)
        {
            var item = await _itemBasicRepository.FirstOrDefaultAsync(p => p.Code == bom.Component).ConfigureAwait(false);
            if (item == null)
            {
                throw new UserFriendlyException($"代码为 {bom.Component} 的物品信息不存在.");
            }
            if (item.IsPhantom)
            {
                var where = BuildExpression(item.Code, mfgOp, validTime, onlyFromProductionPlan);
                var query = (await _repository.GetDbSetAsync().ConfigureAwait(false)).AsNoTracking().Where(where);
                Console.WriteLine(query.ToString());
                var phantomItemBoms = await query.ToListAsync().ConfigureAwait(false);
                //递归获取下层BOM的子零件为虚零件的BOM
                var nextLevelBoms = await GetPhantomItemBomsAsync(phantomItemBoms, mfgOp, validTime, onlyFromProductionPlan).ConfigureAwait(false);
                result.AddRange(nextLevelBoms);
            }
            else
            {
                result.Add(bom);
            }
        }
        return result;
    }

    /// <summary>
    /// 所有父物料号
    /// </summary>
    /// <param name="component"></param>
    /// <returns></returns>
    public virtual async Task<List<Bom>> GetListOfComponentAsync(string component)
    {
        return await _repository.GetListAsync(p => p.Component == component).ConfigureAwait(false);
    }
}