using System;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;
using BlueWest.Data;
using Microsoft.EntityFrameworkCore;

namespace BlueWest.WebApi.EF;

public static class GenericExtensions
{
    
        
    internal static T GetOne<T>(this DbSet<T> dbSet, Expression<Func<T,bool>> predicate) where T: class => dbSet.FirstOrDefault(predicate);
    
    internal static async Task<T> GetOneAsync<T>(this DbSet<T> dbSet, Expression<Func<T,bool>> predicate) where T: class => await dbSet.FirstOrDefaultAsync(predicate);


    internal static (bool, T) NotFound<T>() where T : class => (false, null);

    internal static (bool, T) Add<T>(this DbSet<T> dbSet, DbContext dbContext, T objectToAdd) where T: class
    {
        var newEntity = dbSet.Add(objectToAdd).Entity;
        return (dbContext.SaveChanges() >= 0, newEntity);
    }
    
    internal static async Task<(bool, T)> AddAsync<T>(this DbSet<T> dbSet, DbContext dbContext, T objectToAdd) where T: class
    {
        var newEntity = dbSet.Add(objectToAdd);
        bool resultOperation = await dbContext.SaveChangesAsync() >= 0;
        return (resultOperation, objectToAdd);
    }
    
    
    internal static (bool, T) Update<T>(this DbSet<T> dbSet, DbContext dbContext, T objectToUpdate) where T: class
    {
       
        dbContext.Update(objectToUpdate);
        var resultOperation = dbContext.SaveChanges() >= 0;
        return resultOperation ? (true, objectToUpdate) : (false, null);
    }
    
    internal static async Task<(bool, T)> UpdateAsync<T>(this DbSet<T> dbSet, DbContext dbContext, T objectToUpdate) where T: class
    {
        dbSet.Update(objectToUpdate);
        var result = await dbContext.SaveChangesAsync() >= 0;
        return (result, objectToUpdate);
    }

}