using Microsoft.EntityFrameworkCore;
using SushiBarContracts.BindingModels;
using SushiBarContracts.SearchModels;
using SushiBarContracts.StoragesContracts;
using SushiBarContracts.ViewModels;
using SushiBarDatabaseImplement.Models;
using SushiBarDataModels.Models;

namespace SushiBarDatabaseImplement.Implements;

public class StoreStorage : IStoreStorage
{
    public List<StoreViewModel> GetFullList()
    {
        using var context = new SushiBarDatabase();
        return context.Stores
            .Include(x => x.StoreSushi)
            .ThenInclude(x => x.Sushi)
            .Select(x => x.GetViewModel)
            .ToList();
    }

    public List<StoreViewModel> GetFilteredList(StoreSearchModel model)
    {
        if (string.IsNullOrEmpty(model.StoreName))
        {
            return new List<StoreViewModel>();
        }
        using var context = new SushiBarDatabase();
        return context.Stores
            .Include(x => x.StoreSushi)
            .ThenInclude(x => x.Sushi)
            .Select(x => x.GetViewModel)
            .Where(x => x.StoreName.Contains(model.StoreName ?? string.Empty))
            .ToList();
    }

    public StoreViewModel? GetElement(StoreSearchModel model)
    {
        if (!model.Id.HasValue)
        {
            return null;
        }
        using var context = new SushiBarDatabase();
        return context.Stores
            .Include(x => x.StoreSushi)
            .ThenInclude(x => x.Sushi)
            .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)
            ?.GetViewModel;
    }

    public StoreViewModel? Insert(StoreBindingModel model)
    {
        using var context = new SushiBarDatabase();
        using var transaction = context.Database.BeginTransaction();
        try
        {
            var store = Store.Create(context, model);
            if (store == null)
            {
                return null;
            }
            if (context.Stores.Any(x => x.StoreName == store.StoreName))
            {
                throw new Exception("Name already exists!");
            }
            context.Stores.Add(store);
            context.SaveChanges();
            transaction.Commit();
            return store.GetViewModel;
        }
        catch
        {
            transaction.Rollback();
            throw;
        }
    }

    public StoreViewModel? Update(StoreBindingModel model)
    {
        using var context = new SushiBarDatabase();
        var shop = context.Stores.FirstOrDefault(x => x.Id == model.Id);
        if (shop == null)
        {
            return null;
        }
        shop.Update(model);
        shop.UpdateSushi(context, model);
        context.SaveChanges();
        return shop.GetViewModel;
    }

    public StoreViewModel? Delete(StoreBindingModel model)
    {
        using var context = new SushiBarDatabase();
        var element = context.Stores.FirstOrDefault(x => x.Id == model.Id);
        if (element == null) return null;
        context.Stores.Remove(element);
        context.SaveChanges();
        return element.GetViewModel;
    }

    public bool SellSushi(ISushiModel model, int quantity)
    {
        using var context = new SushiBarDatabase();
        using var transaction = context.Database.BeginTransaction();
        foreach (var sp in 
                 context.StoreSushis.Where(x => x.SushiId == model.Id))
        {
            var res = Math.Min(quantity, sp.Count);
            sp.Count -= res;
            quantity -= res;
            if (sp.Count == 0) context.StoreSushis.Remove(sp);
            if (quantity == 0)
                break;
        }
        if (quantity == 0)
        {
            context.SaveChanges();
            transaction.Commit();
        }
        else
        {
            transaction.Rollback();
        }
        return quantity == 0;
    }
}