using System.Text;
using System.Text.Json;
using StandManager.Domain.DTO;
using StandManager.Domain.Entita;
using StandManager.Service.Interfaces;
using StandManager.Service.Mail;

namespace StandManager.Service;

public class RegistrazioneMailProcessor : IMailProcessor
{
    private readonly IManagerService _managerService;

    public RegistrazioneMailProcessor(IManagerService managerService)
    {
        _managerService = managerService;
    }
    
    public MailFrom MailFrom => MailFrom.Registrazione;
    
    public async Task ProcessAsync(List<MailQueue> mailQueueList, EmailConfig _config, HttpClient httpClient)
    {
        var size = _config.RangeSize != 0 ? _config.RangeSize : mailQueueList.Count;

        foreach (var chunk in mailQueueList.Chunk(size))
        {
            var emailTasks = chunk.Select(async mailQueue =>
            {
                try
                {
                    var email = new Email()
                    {
                        From = _config.From,
                        Body = string.IsNullOrEmpty(mailQueue.Args)
                               ? mailQueue.Body
                               : string.Format(mailQueue.Body, mailQueue.Args?.Split(_config.MailSplitChar) ?? Array.Empty<string>()),
                        Cc = null,
                        Subject = mailQueue.Subject,
                        To = mailQueue.ToList.Split(";").ToList() // new() { "g.vitari@oaservice.it" }
                    };

                    var messageJson = JsonSerializer.Serialize(email);

                    // multipart
                    using var form = new MultipartFormDataContent();
                    form.Add(new StringContent(messageJson, Encoding.UTF8, "application/json"), "messageJson");

                    //Attachments
                    /* if (File.Exists(@"C:\temp\test.pdf")) {
                       var fileBytes = await File.ReadAllBytesAsync(@"C:\temp\test.pdf");
                       var fileContent = new ByteArrayContent(fileBytes);
                       fileContent.Headers.ContentType = MediaTypeHeaderValue.Parse("application/pdf");
                       form.Add(fileContent, "attachments", "test.pdf");
                    } 
                    */

                    var response = await httpClient.PostAsync(
                        _config.ServerAddress,
                        form
                    );
                    response.EnsureSuccessStatusCode();
                    mailQueue.Sent = true;
                    mailQueue.Error = null;
                    return mailQueue;
                }
                catch (Exception e)
                {
                    mailQueue.Sent = false;
                    mailQueue.Error = e.Message;
                    return mailQueue;
                }
            });

            // Prendo i risultati dell'invio
            var results = await Task.WhenAll(emailTasks);

            // Salvo in blocco le entità
            await _managerService.MailQueueService.Salva(results.ToList());
        }
    }
}