using Microsoft.AspNetCore.Mvc;
using System.IO;
using System.Threading.Tasks;
using System.Net.Http;
using System;
using System.Linq;

namespace TestExample.Controllers;

[ApiController]
[Route("[controller]")]
public class SimpleController : ControllerBase
{
    private readonly string _previousUrl = string.Empty;

    private Stream GetOutputStream(string fileName)
    {
        using (var stream = System.IO.File.OpenWrite(fileName))
        {
            return stream;
        }
    }

    private static bool FileExists(string fileName)
        => Directory.GetFiles(Directory.GetCurrentDirectory())
            .Where(file => Path.GetExtension(file).Equals(".html", StringComparison.InvariantCultureIgnoreCase))
            .Any(x => x.Equals(fileName, StringComparison.InvariantCultureIgnoreCase));

    [HttpGet]
    public async Task<IActionResult> GetWebpage(string url)
    {
        if (_previousUrl == url)
        {
            return Ok();
        }

        using var client = new HttpClient();
        var result = await client.GetStreamAsync(url);

        var fileName = $"{Guid.NewGuid().ToString()}.html";
        if (FileExists(fileName))
        {
            return Conflict(fileName);
        }

        using var stream = GetOutputStream(fileName);
        await result.CopyToAsync(stream);
        await stream.FlushAsync();

        _previousUrl = url;

        return Ok();
    }
}