using System.Collections;
using Microsoft.Data.SqlClient;

namespace Library;

public class BookListData : IEnumerable<BookData>
{
	private readonly List<BookData> m_Elements = new( );

	public IEnumerator<BookData> GetEnumerator( )
	{
		return m_Elements.GetEnumerator( );
	}

	IEnumerator IEnumerable.GetEnumerator( )
	{
		return m_Elements.GetEnumerator( );
	}

	static public int GetCategoryCount( SqlConnection connection , int category_id )
	{
		return new SQLBuilder( connection , @"SELECT count(*) FROM v_repository WHERE category_id=@category and include_category_id=@category" )
			.AddParameter( "@category" , category_id )
			.ExecuteAndReadInteger( 0 );
	}

	public static int GetTotalSearchCount( SqlConnection connection , string term )
	{
		return new SQLBuilder( connection , "SELECT count(*) FROM v_repository_search" )
			.AddLike( "search_index" , term )
			.ExecuteAndReadInteger( 0 );
	}

	public void LoadSearch( SqlConnection connection , string term , int page , int items_per_page )
	{
		using SqlDataReader reader = new SQLBuilder( connection , "SELECT * FROM v_repository_search" , "title" )
			.AddLike( "search_index" , term )
			.SetPaging( page , items_per_page )
			.ExecuteReader( );

		while ( reader.Read( ) )
		{
			BookData book = new( )
			{
				ID = reader.Int( "id" ) ,
				UUID = reader.StringSafe( "uuid" ) ,
				CategoryID = reader.Int( "category_id" ) ,
				CategoryName = reader.StringSafe( "category_name" ) ,
				BookTypeID = reader.Int( "book_type_id" ) ,
				BookTypeName = reader.StringSafe( "book_type_name" ) ,
				Title = reader.StringSafe( "title" ) ,
				Author = reader.StringSafe( "author" ) ,
				Access = reader.StringSafe( "access" ) ,
				Keywords = reader.StringSafe( "keywords" ) ,
/*				Publisher = reader.StringSafe( "publisher" ) ,
				PublishYear = reader.StringSafe( "publish_year" ) ,
				Keywords = reader.StringSafe( "keywords" ) ,
				Description = reader.StringSafe( "description" ) ,
				CreateDate = reader.DateTime( "create_date" ) ,
				Opisanie = reader.StringSafe( "opisanie" ) ,
				KodDrugi = reader.StringSafe( "koddrugi" ) ,
*/
			};
			m_Elements.Add( book );
		}
	}


	public void LoadCategory( SqlConnection connection , int category_id , int page , int books_per_page )
	{
		using SqlDataReader reader = new SQLBuilder( connection ,
		//	"select * from v_repository where include_category_id=category_id"
			@"SELECT * FROM v_repository 
			WHERE category_id=@category and include_category_id=@category
			ORDER BY sort, title
			OFFSET @offset ROWS
			FETCH NEXT @rows ROWS ONLY"
			)
			.AddParameter( "@category" , category_id )
			.AddParameter( "@offset" , page * books_per_page )
			.AddParameter( "@rows" , books_per_page )
			.ExecuteReader( );

		while ( reader.Read( ) )
		{
			BookData book = new( )
			{
				ID = reader.Int( "id" ) ,
				UUID = reader.StringSafe( "uuid" ) ,
				CategoryID = reader.Int( "category_id" ) ,
				CategoryName = reader.StringSafe( "category_name" ) ,
				BookTypeID = reader.Int( "book_type_id" ) ,
				BookTypeName = reader.StringSafe( "book_type_name" ) ,
				Title = reader.StringSafe( "title" ) ,
				Author = reader.StringSafe( "author" ) ,
				Access = reader.StringSafe( "access" ) ,
/*				Publisher = reader.StringSafe( "publisher" ) ,
				PublishYear = reader.StringSafe( "publish_year" ) ,
				Keywords = reader.StringSafe( "keywords" ) ,
				Description = reader.StringSafe( "description" ) ,
				CreateDate = reader.DateTime( "create_date" ) ,
				Opisanie = reader.StringSafe( "opisanie" ) ,
				KodDrugi = reader.StringSafe( "koddrugi" ) , */
			};
			m_Elements.Add( book );
		}
	}
}