using Microsoft.AspNetCore.Mvc;
using System.Text;
using System.Text.Json;

namespace Library;

public class APIController : AbstractController
{
	protected APIController( ILogger logger , IConfiguration configuration )
		: base( logger , configuration )
	{
	}

	protected void AssertID( int value )
	{
		if ( value <= 0 )
			throw new APIErrorException( "Invalid id parameter" );
	}

	protected void AssertParameter( int value , int min_value )
	{
		if ( value < min_value )
			throw new APIErrorException( "Invalid int parameter" );
	}

	protected void AssertParameter( string? value , int min_length )
	{
		if ( !ValidateString( value , min_length ) )
			throw new APIErrorException( "Invalid string parameter" );
	}

	protected void AssertURL( string? value , bool mandatory )
	{
		if ( !ValidateURL( value , mandatory ) )
			throw new APIErrorException( "Invalid url parameter" );
	}

	protected void AssertEmail( string? value , bool mandatory )
	{
		if ( !ValidateEmail( value , mandatory ) )
			throw new APIErrorException( "Invalid email parameter" );
	}

	protected override void OnInvalidLogin( )
	{
		throw new APIErrorException( "Access denied." );
	}

	protected override void OnInvalidAdminLogin( )
	{
		throw new APIErrorException( "Access denied (admin)." );
	}

	protected ContentResult Error( string message )
	{
		using MemoryStream stream = new( );

		using Utf8JsonWriter writer = new( stream );
		writer.WriteStartObject( );
		writer.WriteBoolean( "Success" , false );
		writer.WriteString( "ErrorMessage" , message );
		writer.WriteEndObject( );
		writer.Dispose( );

		return new ContentResult( )
		{
			ContentType = System.Net.Mime.MediaTypeNames.Application.Json ,
			Content = Encoding.UTF8.GetString( stream.ToArray( ) )
		};
	}

	protected ContentResult Success( )
	{
		return Success( "true" );
	}

	protected ContentResult Success( string data )
	{
		using MemoryStream stream = new( );

		using Utf8JsonWriter writer = new( stream );
		writer.WriteStartObject( );
		writer.WriteBoolean( "Success" , true );
		writer.WriteString( "Result" , data );
		writer.WriteEndObject( );
		writer.Dispose( );

		return new ContentResult( )
		{
			ContentType = System.Net.Mime.MediaTypeNames.Application.Json ,
			Content = Encoding.UTF8.GetString( stream.ToArray( ) )
		};
	}
}