// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: MIT-0

using System;
using System.IO;
using System.Text;
using Amazon.Lambda.APIGatewayEvents;
using Amazon.Lambda.Core;
using Amazon.Lambda.Serialization.SystemTextJson;
using Amazon.Lambda.TestUtilities;

namespace Unicorn.Contracts.Tests;

public static class TestHelpers
{
    public static APIGatewayProxyRequest LoadApiGatewayProxyRequest(string filename)
    {
        var serializer = Activator.CreateInstance(typeof(DefaultLambdaJsonSerializer)) as ILambdaSerializer;

        APIGatewayProxyRequest request = null;

        using (var fileStream = LoadJsonTestFile(filename))
        {
            if (serializer != null)
            {
                request = serializer.Deserialize<APIGatewayProxyRequest>(fileStream);
            }
        }

        return request;
    }

    // This utility method takes care of removing the BOM that System.Text.Json doesn't like.
    public static MemoryStream LoadJsonTestFile(string filename)
    {
        var json = File.ReadAllText(filename);
        return new MemoryStream(Encoding.UTF8.GetBytes(json));
    }

    /// <summary>
    /// Creates new Lambda context
    /// </summary>
    /// <returns>TestLambdaContext</returns>
    public static TestLambdaContext NewLambdaContext()
    {
        return new TestLambdaContext
        {
            FunctionName = "uni-prop-local-properties-PropertiesApprovalSyncFu-JWaDc4Gm3SgL",
            FunctionVersion = "1",
            MemoryLimitInMB = 215,
            AwsRequestId = Guid.NewGuid().ToString("D")
        };
    }
    
}