using FrameworkDAL.DTO.MessageHub.MessageHubGenerator;
using GB5Shared.DTO.Framework.Login;
using Microsoft.Extensions.Options;
using Newtonsoft.Json;
using System;
using System.Net.Http;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace FrameworkBLL.MessageHub.MessageHubPlatforms
{
    public class SlackPlatform : IMessageHubPlatform.ISlackPlatform
    {
        private readonly IHttpClientFactory _httpClientFactory;
        private readonly SlackSettings _settings;

        public SlackPlatform(
            IHttpClientFactory httpClientFactory,
            IOptions<MessageHubSettings> settings)
        {
            _httpClientFactory = httpClientFactory ?? throw new ArgumentNullException(nameof(httpClientFactory));
            _settings = settings?.Value?.Slack ?? throw new ArgumentNullException(nameof(settings));
        }

        // ==========================================================
        // ✅ TEMPLATE VERSION - Slack MessageHubEngine
        // ==========================================================
        public async Task<MessageHubResponseDTO> SendSlackTemplate(
            MessageHubDTO dto,
            LoginDTO login,
            CancellationToken ct)
        {
            if (dto == null) return Fail("Template DTO cannot be null");
            if (login == null) return Fail("Login info missing");
            if (string.IsNullOrWhiteSpace(_settings?.WebhookUrl)) return Fail("Slack WebhookUrl not configured");

            var payload = new
            {
                channel = string.IsNullOrWhiteSpace(dto.Recipient) ? _settings.DefaultChannel : dto.Recipient,
                username = string.IsNullOrWhiteSpace(_settings.DefaultUserName) ? "MessageHub" : _settings.DefaultUserName,
                icon_emoji = string.IsNullOrWhiteSpace(_settings.DefaultIconEmoji) ? ":robot_face:" : _settings.DefaultIconEmoji,
                text = $"*📢 TEMPLATE MESSAGE*\n\n{dto.MessageText}\n\n_Sent by: {login.UserName}_"
            };

            try
            {
                var client = _httpClientFactory.CreateClient();
                var response = await client.PostAsync(
                    _settings.WebhookUrl,
                    new StringContent(JsonConvert.SerializeObject(payload), Encoding.UTF8, "application/json"),
                    ct);

                var responseContent = await response.Content.ReadAsStringAsync(ct);

                return new MessageHubResponseDTO
                {
                    Success = response.IsSuccessStatusCode,
                    Message = response.IsSuccessStatusCode
                        ? "Slack Template message sent successfully"
                        : "Slack Template message failed",
                    ResponseData = responseContent
                };
            }
            catch (Exception ex)
            {
                return Fail(ex.Message);
            }
        }

        // ==========================================================
        // ✅ CONVERSATION VERSION - Slack MessageHubConversation
        // ==========================================================
        public async Task<MessageHubResponseDTO> SendSlackConversation(
            MessageHubDTO dto,
            LoginDTO login,
            CancellationToken ct)
        {
            if (dto == null) return Fail("Conversation DTO cannot be null");
            if (login == null) return Fail("Login info missing");
            if (string.IsNullOrWhiteSpace(_settings?.WebhookUrl)) return Fail("Slack WebhookUrl not configured");

            var payload = new
            {
                channel = string.IsNullOrWhiteSpace(dto.Recipient) ? _settings.DefaultChannel : dto.Recipient,
                username = string.IsNullOrWhiteSpace(_settings.DefaultUserName) ? "MessageHub" : _settings.DefaultUserName,
                icon_emoji = string.IsNullOrWhiteSpace(_settings.DefaultIconEmoji) ? ":robot_face:" : _settings.DefaultIconEmoji,
                text = dto.MessageText // Pure conversation text
            };

            try
            {
                var client = _httpClientFactory.CreateClient();
                var response = await client.PostAsync(
                    _settings.WebhookUrl,
                    new StringContent(JsonConvert.SerializeObject(payload), Encoding.UTF8, "application/json"),
                    ct);

                var responseContent = await response.Content.ReadAsStringAsync(ct);

                return new MessageHubResponseDTO
                {
                    Success = response.IsSuccessStatusCode,
                    Message = response.IsSuccessStatusCode
                        ? "Slack Conversation message sent successfully"
                        : "Slack Conversation message failed",
                    ResponseData = responseContent
                };
            }
            catch (Exception ex)
            {
                return Fail(ex.Message);
            }
        }

        // ==========================================================
        // PRIVATE HELPER
        // ==========================================================
        private static MessageHubResponseDTO Fail(string reason)
            => new() { Success = false, Message = reason };
    }
}