ParadoxSaveParser/ParadoxSaveParser.WebAPI/Routes/GetSaveDataHandler.cs

using System.Net;
using ParadoxSaveParser.WebAPI.Database;
using ParadoxSaveParser.WebAPI.HttpHelpers;

namespace ParadoxSaveParser.WebAPI.Routes;

internal class GetSaveDataHandler : RouteHandlerBase
{
    public GetSaveDataHandler(CancellationToken cancelAllToken) 
        : base(cancelAllToken)
    {
    }

    public override async Task<HttpStatusCode> HandleRequest(
        HttpListenerContext ctx, ContextLogger requestLogger)
    {
        var idOrError = RequestHelper.GetQueryValue(ctx, "id");
        if (idOrError.HasError)
            return await ReturnHelper.ResponseError(ctx, requestLogger, _cancelAllToken, idOrError.Error!);
        string id = idOrError.Value!;

        var meta = await Program.DB.GetMetadata(id);
        if(meta is null)
            return await ReturnHelper.ResponseError(ctx, requestLogger, _cancelAllToken, 
                new ErrorMessage(HttpStatusCode.NotFound,
                    $"Save with id {id} not found"));
        if(meta.status != SaveFileProcessingStatus.Done)
            return await ReturnHelper.ResponseError(ctx, requestLogger, _cancelAllToken, 
                new ErrorMessage(HttpStatusCode.BadRequest,
                    $"Save with id {id} has status {meta.status}"));
        
        IOPath dataFilePath = meta.GetParsedDataPath();
        if (!File.Exists(dataFilePath))
            return await ReturnHelper.ResponseError(ctx, requestLogger, _cancelAllToken,
                new ErrorMessage(HttpStatusCode.InternalServerError, 
                    $"Save with id {id} not found")
            );

        await using var dataFile = File.OpenRead(dataFilePath);
        
        return await ReturnHelper.ResponseStream(ctx, requestLogger, _cancelAllToken,
            dataFile, contentType: "application/json");
    }
}