using System.Collections;
using Microsoft.AspNetCore.Http.HttpResults;
Queue<EncodingJob> JobQueue = new();

var builder = WebApplication.CreateBuilder(args);

//Settings
string tmpFilePath = builder.Configuration.GetValue<string>("TempFilePath") ?? Path.GetTempPath();

//Services
builder.Services.AddOpenApi();
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());
    JobQueue.Enqueue(Job);
    
    return context.Response.WriteAsJsonAsync(new { JobId = Job.Id });
});

// Check the status of an encoding job by its ID
app.MapGet("status/{jobId:guid}", (Guid jobId) =>
{
    var job = JobQueue.FirstOrDefault(j => j.Id == jobId);
    if (job == null) {
        return Results.NotFound(new { Message = "Job not found." });
    }
    
    return Results.Ok(new { 
        JobId = job.Id, 
        Status = job.Status.ToString(),
        CreatedAt = job.CreatedAt,
        CompletedAt = job.CompletedAt 
    });
});

app.MapGet("file/{jobId:guid}", (Guid jobId) =>
{
    var job = JobQueue.FirstOrDefault(j => j.Id == 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();

public enum JobStatus {
    Pending,
    InProgress,
    Completed,
    Failed
}

public record EncodingJob(Guid Id) {
    public JobStatus Status { get; set; } = JobStatus.Pending;
    public DateTime CreatedAt { get; init; } = DateTime.Now;
    public DateTime? CompletedAt { get; set; } = null;
    public string OrigFilePath { get; init; } = string.Empty;
    public string EncodedFilePath { get; set; } = string.Empty;
}