using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Common.Updates;
using MediaBrowser.Model.Globalization;
using MediaBrowser.Model.Tasks;
using Microsoft.Extensions.Logging;

namespace Emby.Server.Implementations.ScheduledTasks.Tasks;

/// <summary>
/// Plugin Update Task.
/// </summary>
public class PluginUpdateTask : IScheduledTask, IConfigurableScheduledTask
{
    private readonly ILogger<PluginUpdateTask> _logger;

    private readonly IInstallationManager _installationManager;
    private readonly ILocalizationManager _localization;

    /// <summary>
    /// Initializes a new instance of the <see cref="PluginUpdateTask" /> class.
    /// </summary>
    /// <param name="logger">Instance of the <see cref="ILogger"/> interface.</param>
    /// <param name="installationManager">Instance of the <see cref="IInstallationManager"/> interface.</param>
    /// <param name="localization">Instance of the <see cref="ILocalizationManager"/> interface.</param>
    public PluginUpdateTask(ILogger<PluginUpdateTask> logger, IInstallationManager installationManager, ILocalizationManager localization)
    {
        _logger = logger;
        _installationManager = installationManager;
        _localization = localization;
    }

    /// <inheritdoc />
    public string Name => _localization.GetLocalizedString("TaskUpdatePlugins");

    /// <inheritdoc />
    public string Description => _localization.GetLocalizedString("TaskUpdatePluginsDescription");

    /// <inheritdoc />
    public string Category => _localization.GetLocalizedString("TasksApplicationCategory");

    /// <inheritdoc />
    public string Key => "PluginUpdates";

    /// <inheritdoc />
    public bool IsHidden => false;

    /// <inheritdoc />
    public bool IsEnabled => true;

    /// <inheritdoc />
    public bool IsLogged => true;

    /// <inheritdoc />
    public IEnumerable<TaskTriggerInfo> GetDefaultTriggers()
    {
        yield return new TaskTriggerInfo
        {
            Type = TaskTriggerInfoType.StartupTrigger
        };

        yield return new TaskTriggerInfo
        {
            Type = TaskTriggerInfoType.IntervalTrigger,
            IntervalTicks = TimeSpan.FromHours(24).Ticks
        };
    }

    /// <inheritdoc />
    public async Task ExecuteAsync(IProgress<double> progress, CancellationToken cancellationToken)
    {
        progress.Report(0);

        var packageFetchTask = _installationManager.GetAvailablePluginUpdates(cancellationToken);
        var packagesToInstall = (await packageFetchTask.ConfigureAwait(false)).ToList();

        progress.Report(10);

        var numComplete = 0;

        foreach (var package in packagesToInstall)
        {
            cancellationToken.ThrowIfCancellationRequested();

            try
            {
                await _installationManager.InstallPackage(package, cancellationToken).ConfigureAwait(false);
            }
            catch (OperationCanceledException)
            {
                // InstallPackage has its own inner cancellation token, so only throw this if it's ours
                if (cancellationToken.IsCancellationRequested)
                {
                    throw;
                }
            }
            catch (HttpRequestException ex)
            {
                _logger.LogError(ex, "Error downloading {Name}", package.Name);
            }
            catch (IOException ex)
            {
                _logger.LogError(ex, "Error updating {Name}", package.Name);
            }
            catch (InvalidDataException ex)
            {
                _logger.LogError(ex, "Error updating {Name}", package.Name);
            }

            // Update progress
            lock (progress)
            {
                progress.Report((90.0 * ++numComplete / packagesToInstall.Count) + 10);
            }
        }

        progress.Report(100);
    }
}
