using NewsBlogAbstractions.Models;
using NewsBlogAbstractions.WorkAbstractions;
using Npgsql;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NewsBlogDatabaseImplementation.WorkImplementation
{
	public class CommentWork : ICommentWork
	{
		public Comment? Create(Comment comment)
		{
			using var con = SqlConnection.GetConnection();
			con.Open();
			using var cmd = new NpgsqlCommand("INSERT INTO comment (title, content, create_date, article_id) VALUES (@Title, @Content, @Create_date, @Article_id)", con);
			cmd.Parameters.AddWithValue("@Title", comment.Title);
			cmd.Parameters.AddWithValue("@Content", comment.Content);
			cmd.Parameters.AddWithValue("@Create_date", comment.CreateDate);
			cmd.Parameters.AddWithValue("@Article_id", comment.ArticleId == 0 ? DBNull.Value : comment.ArticleId);
			cmd.ExecuteNonQuery();
			return comment;
		}

		public Comment? Delete(int id)
		{
			var element = Get(id);
			using var con = SqlConnection.GetConnection();
			con.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM comment WHERE comment_id = {id}", con);
			cmd.ExecuteNonQuery();
			return element;
		}

		public Comment? Get(int id)
		{
			using var con = SqlConnection.GetConnection();
			con.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM comment WHERE comment_id = {id}", con);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Comment
				{
					Id = reader.GetInt32(0),
					Title = reader.GetString(1),
					Content = reader.GetString(2),
					CreateDate = reader.GetDateTime(3),
					ArticleId = !reader.IsDBNull(4) ? reader.GetInt32(4) : 0,
				};
			}
			return null;
		}

		public List<Comment> GetAll()
		{
			var comments = new List<Comment>();
			using var con = SqlConnection.GetConnection();
			con.Open();
			using var cmd = new NpgsqlCommand("SELECT * FROM comment order by comment_id", con);
			using var reader = cmd.ExecuteReader();
			while (reader.Read())
			{
				comments.Add(new Comment
				{
					Id = reader.GetInt32(0),
					Title = reader.GetString(1),
					Content = reader.GetString(2),
					CreateDate = reader.GetDateTime(3),
					ArticleId = !reader.IsDBNull(4) ? reader.GetInt32(4) : 0,
				});
			}
			return comments;
		}

		public Comment? Update(Comment comment)
		{
			using var con = SqlConnection.GetConnection();
			con.Open();
			using var cmd = new NpgsqlCommand($"UPDATE comment SET title = '{comment.Title}', content = '{comment.Content}', create_date = '{comment.CreateDate}', article_id = @Article_Id WHERE comment_id = {comment.Id}", con);
			cmd.Parameters.AddWithValue("@Article_Id", comment.ArticleId == 0 ? DBNull.Value : comment.ArticleId);
			cmd.ExecuteNonQuery();
			var element = Get(comment.Id);
			return element;
		}
	}
}