using System.Net.Http.Json;
using System.Text;
using System.Text.Json;
using KronaStaffTerminal.Models;

namespace KronaStaffTerminal.Services;

public sealed class NotificationService
{
    private readonly HttpClient _httpClient = new() { Timeout = TimeSpan.FromSeconds(15) };

    public async Task<(bool Delivered, string? Error)> SendArrivalAsync(TerminalSettings settings, string employeeName, DateTimeOffset localTime)
    {
        return await SendAsync(settings, $"{employeeName} пришёл(а) в {localTime:HH:mm}");
    }

    public async Task<(bool Delivered, string? Error)> SendTestAsync(TerminalSettings settings)
    {
        return await SendAsync(settings, "Krona Staff: тестовое сообщение доставлено.");
    }

    private async Task<(bool Delivered, string? Error)> SendAsync(TerminalSettings settings, string text)
    {
        var errors = new List<string>();
        var sent = false;

        if (settings.TelegramEnabled)
        {
            try
            {
                var url = $"https://api.telegram.org/bot{settings.TelegramBotToken}/sendMessage";
                using var response = await _httpClient.PostAsJsonAsync(url, new { chat_id = settings.TelegramChatId, text });
                if (!response.IsSuccessStatusCode)
                {
                    errors.Add($"Telegram: HTTP {(int)response.StatusCode}");
                }
                else
                {
                    sent = true;
                }
            }
            catch (Exception exception)
            {
                errors.Add($"Telegram: {exception.Message}");
            }
        }

        if (settings.MaxEnabled)
        {
            try
            {
                var url = $"https://platform-api.max.ru/messages?chat_id={Uri.EscapeDataString(settings.MaxChatId)}";
                using var request = new HttpRequestMessage(HttpMethod.Post, url);
                request.Headers.TryAddWithoutValidation("Authorization", settings.MaxBotToken);
                request.Content = new StringContent(JsonSerializer.Serialize(new { text }), Encoding.UTF8, "application/json");
                using var response = await _httpClient.SendAsync(request);
                if (!response.IsSuccessStatusCode)
                {
                    errors.Add($"MAX: HTTP {(int)response.StatusCode}");
                }
                else
                {
                    sent = true;
                }
            }
            catch (Exception exception)
            {
                errors.Add($"MAX: {exception.Message}");
            }
        }

        if (!settings.TelegramEnabled && !settings.MaxEnabled)
        {
            return (false, null);
        }

        return (sent && errors.Count == 0, errors.Count == 0 ? null : string.Join("; ", errors));
    }
}