using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Mime;
using Jellyfin.Api.Attributes;
using Jellyfin.Api.Constants;
using Jellyfin.Api.Models;
using MediaBrowser.Common.Plugins;
using MediaBrowser.Model.Net;
using MediaBrowser.Model.Plugins;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace Jellyfin.Api.Controllers
{
    /// <summary>
    /// The dashboard controller.
    /// </summary>
    [Route("")]
    public class DashboardController : BaseJellyfinApiController
    {
        private readonly ILogger<DashboardController> _logger;
        private readonly IPluginManager _pluginManager;

        /// <summary>
        /// Initializes a new instance of the <see cref="DashboardController"/> class.
        /// </summary>
        /// <param name="logger">Instance of <see cref="ILogger{DashboardController}"/> interface.</param>
        /// <param name="pluginManager">Instance of <see cref="IPluginManager"/> interface.</param>
        public DashboardController(
            ILogger<DashboardController> logger,
            IPluginManager pluginManager)
        {
            _logger = logger;
            _pluginManager = pluginManager;
        }

        /// <summary>
        /// Gets the configuration pages.
        /// </summary>
        /// <param name="enableInMainMenu">Whether to enable in the main menu.</param>
        /// <response code="200">ConfigurationPages returned.</response>
        /// <response code="404">Server still loading.</response>
        /// <returns>An <see cref="IEnumerable{ConfigurationPageInfo}"/> with infos about the plugins.</returns>
        [HttpGet("web/ConfigurationPages")]
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status404NotFound)]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        public ActionResult<IEnumerable<ConfigurationPageInfo>> GetConfigurationPages(
            [FromQuery] bool? enableInMainMenu)
        {
            var configPages = _pluginManager.Plugins.SelectMany(GetConfigPages).ToList();

            if (enableInMainMenu.HasValue)
            {
                configPages = configPages.Where(p => p.EnableInMainMenu == enableInMainMenu.Value).ToList();
            }

            return configPages;
        }

        /// <summary>
        /// Gets a dashboard configuration page.
        /// </summary>
        /// <param name="name">The name of the page.</param>
        /// <response code="200">ConfigurationPage returned.</response>
        /// <response code="404">Plugin configuration page not found.</response>
        /// <returns>The configuration page.</returns>
        [HttpGet("web/ConfigurationPage")]
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status404NotFound)]
        [ProducesFile(MediaTypeNames.Text.Html, "application/x-javascript")]
        public ActionResult GetDashboardConfigurationPage([FromQuery] string? name)
        {
            var altPage = GetPluginPages().FirstOrDefault(p => string.Equals(p.Item1.Name, name, StringComparison.OrdinalIgnoreCase));
            if (altPage is null)
            {
                return NotFound();
            }

            IPlugin plugin = altPage.Item2;
            string resourcePath = altPage.Item1.EmbeddedResourcePath;
            Stream? stream = plugin.GetType().Assembly.GetManifestResourceStream(resourcePath);
            if (stream is null)
            {
                _logger.LogError("Failed to get resource {Resource} from plugin {Plugin}", resourcePath, plugin.Name);
                return NotFound();
            }

            return File(stream, MimeTypes.GetMimeType(resourcePath));
        }

        private IEnumerable<ConfigurationPageInfo> GetConfigPages(LocalPlugin plugin)
        {
            return GetPluginPages(plugin).Select(i => new ConfigurationPageInfo(plugin.Instance, i.Item1));
        }

        private IEnumerable<Tuple<PluginPageInfo, IPlugin>> GetPluginPages(LocalPlugin plugin)
        {
            if (plugin.Instance is not IHasWebPages hasWebPages)
            {
                return Enumerable.Empty<Tuple<PluginPageInfo, IPlugin>>();
            }

            return hasWebPages.GetPages().Select(i => new Tuple<PluginPageInfo, IPlugin>(i, plugin.Instance));
        }

        private IEnumerable<Tuple<PluginPageInfo, IPlugin>> GetPluginPages()
        {
            return _pluginManager.Plugins.SelectMany(GetPluginPages);
        }
    }
}