using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System.Diagnostics;
using System.Net.Http;
using System.Text;
using System.Text.Json;

namespace Astrocore.Api.Controllers
{


    [Route("api/[controller]")]
    [ApiController]
    public class TextToSpeechController : ControllerBase
    {
        private readonly IHttpClientFactory _httpClientFactory;
        public TextToSpeechController(IHttpClientFactory httpClientFactory)
        {
            _httpClientFactory = httpClientFactory;
        }

        [HttpGet]
        public async Task<IActionResult> Index(string message)
        {
            var client = _httpClientFactory.CreateClient();
            var body = $"msg={Uri.EscapeDataString(message)}&lang=Geraint&source=ttsmp3";
            var request = new HttpRequestMessage(HttpMethod.Post, "https://ttsmp3.com/makemp3_new.php")
            {
                Content = new StringContent(body, Encoding.UTF8, "application/x-www-form-urlencoded")
            };

            var response = await client.SendAsync(request);
            var json = await response.Content.ReadAsStringAsync();
            using var doc = JsonDocument.Parse(json);
            var mp3File = doc.RootElement.GetProperty("URL").GetString();
            var mp3Bytes = await client.GetByteArrayAsync(mp3File);
            var tempDir = Path.GetTempPath();
            var fileNameGuid = Guid.NewGuid().ToString();
            var mp3Path = Path.Combine(tempDir, $"{fileNameGuid}.mp3");
            var dfpwmPath = Path.Combine(tempDir, $"{fileNameGuid}.dfpwm");

            await System.IO.File.WriteAllBytesAsync(mp3Path, mp3Bytes);
            var process = new Process
            {
                StartInfo = new ProcessStartInfo
                {
                    FileName = "ffmpeg",
                    Arguments = $"-i \"{mp3Path}\" -ac 1 -c:a dfpwm -ar 48k \"{dfpwmPath}\"",
                    RedirectStandardError = true,
                    UseShellExecute = false
                }
            };

            process.Start();
            string errorOutput = await process.StandardError.ReadToEndAsync();
            process.WaitForExit();

            if (!System.IO.File.Exists(dfpwmPath))
            {
                return StatusCode(500, $"FFmpeg failed: {errorOutput}");

            }

            var dfpwmBytes = await System.IO.File.ReadAllBytesAsync(dfpwmPath);
            return File(dfpwmBytes, "application/octet-stream", "tts.dfpwm");
        }
    }
}