using Encoder;

var builder = WebApplication.CreateBuilder(args);

//Settings
string? tmpFilePath = builder.Configuration.GetValue<string>("TempFilePath");
string? ffmpegPath = builder.Configuration.GetValue<string>("FfmpegPath");
//Services
builder.Services.AddOpenApi();

var encoderOptions = new EncoderServiceOptions { OutputPath = tmpFilePath };
builder.Services.AddSingleton<IEncoderService, EncoderService>(_ => new (encoderOptions));

var app = builder.Build();

if (app.Environment.IsDevelopment()) { app.MapOpenApi(); }

app.UseHttpsRedirection();

// Get a video file as multipart form data and schedule it for encoding
// Get video encoding settings from query parameters
// Returns the ID of the job handling the encoding
app.MapPost("encode", context => 
{
    var request = context.Request;
    if (!request.HasFormContentType) {
        context.Response.StatusCode = 400;
        return context.Response.WriteAsync("Invalid content type. Expected multipart/form-data.");
    }

    var form = request.Form;
    var file = form.Files.GetFile("video");
    
    if (file == null) {
        context.Response.StatusCode = 400;
        return context.Response.WriteAsync("No video file provided.");
    }
    
    var job = new EncodingJob(Guid.NewGuid());
    var encSrv = context.RequestServices.GetService<EncoderService>();
    if (encSrv != null) encSrv.EnqueueJob(job);
    else {
        context.Response.StatusCode = 500;
        return context.Response.WriteAsync("Encoder service not available.");
    }

    context.Response.StatusCode = 200;
    return context.Response.WriteAsJsonAsync(new { JobId = job.Id });
});

// Check the status of an encoding job by its ID
app.MapGet("status/{jobId:guid}", (HttpContext context, Guid jobId) =>
{
    var encSrv = context.RequestServices.GetService<EncoderService>();
    if (encSrv == null) return Results.InternalServerError();
    
    var job = encSrv.GetJobStatus(jobId);
    if (job == null) {
        return Results.NotFound(new { Message = "Job not found." });
    }
    
    return Results.Ok(new { 
        JobId = job.Id, 
        Status = job.Status.ToString(),
        job.CreatedAt,
        job.CompletedAt 
    });
});

app.MapGet("file/{jobId:guid}", (HttpContext context, Guid jobId) =>
{
    var encSrv = context.RequestServices.GetService<EncoderService>();
    if (encSrv == null) return Results.InternalServerError();
    
    var job = encSrv.GetJobStatus(jobId);
    if (job == null) return Results.NotFound(new { Message = "Job not found." });

    if (job.Status != JobStatus.Completed) return Results.BadRequest(new { Message = "Job is not completed yet." });

    var filePath = job.EncodedFilePath;
    if (!File.Exists(filePath)) return Results.NotFound(new { Message = "Encoded file not found." });

    var fileBytes = File.ReadAllBytes(filePath);
    return Results.File(fileBytes, "video/mp4", Path.GetFileName(filePath), enableRangeProcessing:true);
});

app.Run();