using System.Net.Http;
using System.Text;
using System.Text.Json;
using System.Windows;
using AutoShutdown.Models;

namespace AutoShutdown.Services;

internal sealed class NotificationService
{
    private static readonly HttpClient HttpClient = new();

    private NotificationSettings _settings;

    public NotificationService(NotificationSettings settings)
    {
        _settings = settings;
    }

    public void UpdateSettings(NotificationSettings settings)
    {
        _settings = settings;
    }

    public async Task NotifyAsync(Window owner, string title, string body, MessageBoxImage image = MessageBoxImage.Information)
    {
        if (_settings.Mode == NotificationMode.OmniNotify)
        {
            await TrySendToOmniNotifyAsync(title, body);
            return;
        }

        System.Windows.MessageBox.Show(owner, body, title, MessageBoxButton.OK, image);
    }

    public Task NotifyAsync(string title, string body)
    {
        return _settings.Mode == NotificationMode.OmniNotify
            ? TrySendToOmniNotifyAsync(title, body)
            : Task.CompletedTask;
    }

    public async Task<bool> TestOmniNotifyAsync(NotificationSettings settings)
    {
        var oldSettings = _settings;
        try
        {
            _settings = settings;
            await SendToOmniNotifyAsync("AutoShutdown 测试消息", "OmniNotify 适配已连接。");
            return true;
        }
        catch
        {
            return false;
        }
        finally
        {
            _settings = oldSettings;
        }
    }

    private async Task SendToOmniNotifyAsync(string title, string body)
    {
        if (!Uri.TryCreate(_settings.OmniNotifyEndpoint, UriKind.Absolute, out var endpoint))
        {
            return;
        }

        var payload = JsonSerializer.Serialize(new
        {
            channel = string.IsNullOrWhiteSpace(_settings.Channel) ? "default" : _settings.Channel.Trim(),
            title,
            body
        });

        using var content = new StringContent(payload, Encoding.UTF8, "application/json");
        using var response = await HttpClient.PostAsync(endpoint, content);
        response.EnsureSuccessStatusCode();
    }

    private async Task TrySendToOmniNotifyAsync(string title, string body)
    {
        try
        {
            await SendToOmniNotifyAsync(title, body);
        }
        catch
        {
            // OmniNotify 适配模式下不再弹窗打扰用户，发送失败只静默跳过。
        }
    }
}