using Microsoft.AspNetCore.Mvc;
using RhSolutions.Models;
using RhSolutions.Api.Services;
using System.Linq;

namespace RhSolutions.Api.Controllers
{
	[Route("api/[controller]")]
	public class ProductsController : ControllerBase
	{
		private RhSolutionsContext dbContext;
		private IPricelistParser parser;

		public ProductsController(RhSolutionsContext dbContext, IPricelistParser parser)
		{
			this.dbContext = dbContext;
			this.parser = parser;
		}
		
		/// <summary>
		/// Возвращает все продукты в базе данных
		/// </summary>
		/// <returns></returns>
		[HttpGet]
		public IAsyncEnumerable<Product> GetProducts()
		{
			return dbContext.Products
				.AsAsyncEnumerable();
		}

		/// <summary>
		/// Возвращает продукт по номеру артикула
		/// </summary>
		/// <param name="id">Номер артикула</param>
		/// <returns></returns>
		[HttpGet("{id}")]
		public IEnumerable<Product> GetProduct(string id)
		{
			return dbContext.Products
				.Where(p => p.Id.Equals(id));
		}

		/// <summary>
		/// Загрузка прайс-листа в формате xlsx в базу данных
		/// </summary>
		/// <returns></returns>
		[HttpPost]
		public IActionResult PostProductsFromXls()
		{
			try
			{
				var products = parser.GetProducts(HttpContext).GroupBy(p => p.ProductSku)
					.Select(g => new Product(g.Key)
					{
						Name = g.First().Name,
						DeprecatedSkus = g.SelectMany(p => p.DeprecatedSkus).Distinct().ToList(),
						ProductLines = g.SelectMany(p => p.ProductLines).Distinct().ToList(),
						IsOnWarehouse = g.Any(p => p.IsOnWarehouse == true),
						ProductMeasure = g.First().ProductMeasure,
						DeliveryMakeUp = g.First().DeliveryMakeUp,
						Price = g.First().Price
					});

				foreach (var p in products)
				{
					dbContext.Add<Product>(p);
				}

				dbContext.SaveChanges();
				return Ok();
			}
			catch (Exception ex)
			{
				return BadRequest(ex.Message);
			}
		}

		/// <summary>
		/// Удаление всех продуктов из базы данных 
		/// </summary>
		/// <returns></returns>
		[HttpDelete]
		public IActionResult DeleteAllProducts()
		{
			List<Product> deleted = new();
			if (dbContext.Products.Count() > 0)
			{
				foreach (Product p in dbContext.Products)
				{
					deleted.Add(p);
					dbContext.Remove(p);
				}
				dbContext.SaveChanges();
				return Ok(deleted);
			}
			else return Ok("Empty db");
		}
	}
}