using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Jellyfin.Api.Models;
using MediaBrowser.Common.Plugins;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Extensions;
using MediaBrowser.Controller.Plugins;
using MediaBrowser.Model.Net;
using MediaBrowser.Model.Plugins;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Extensions;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using Microsoft.Net.Http.Headers;

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

        /// <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="appHost">Instance of <see cref="IServerApplicationHost"/> interface.</param>
        public DashboardController(
            ILogger<DashboardController> logger,
            IServerApplicationHost appHost)
        {
            _logger = logger;
            _appHost = appHost;
        }

        /// <summary>
        /// Gets the configuration pages.
        /// </summary>
        /// <param name="enableInMainMenu">Whether to enable in the main menu.</param>
        /// <param name="pageType">The <see cref="ConfigurationPageInfo"/>.</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)]
        public ActionResult<IEnumerable<ConfigurationPageInfo?>> GetConfigurationPages(
            [FromQuery] bool? enableInMainMenu,
            [FromQuery] ConfigurationPageType? pageType)
        {
            const string unavailableMessage = "The server is still loading. Please try again momentarily.";

            var pages = _appHost.GetExports<IPluginConfigurationPage>().ToList();

            if (pages == null)
            {
                return NotFound(unavailableMessage);
            }

            // Don't allow a failing plugin to fail them all
            var configPages = pages.Select(p =>
                {
                    try
                    {
                        return new ConfigurationPageInfo(p);
                    }
                    catch (Exception ex)
                    {
                        _logger.LogError(ex, "Error getting plugin information from {Plugin}", p.GetType().Name);
                        return null;
                    }
                })
                .Where(i => i != null)
                .ToList();

            configPages.AddRange(_appHost.Plugins.SelectMany(GetConfigPages));

            if (pageType.HasValue)
            {
                configPages = configPages.Where(p => p!.ConfigurationPageType == pageType).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)]
        public ActionResult GetDashboardConfigurationPage([FromQuery] string? name)
        {
            IPlugin? plugin = null;
            Stream? stream = null;

            var isJs = false;
            var isTemplate = false;

            var page = _appHost.GetExports<IPluginConfigurationPage>().FirstOrDefault(p => string.Equals(p.Name, name, StringComparison.OrdinalIgnoreCase));
            if (page != null)
            {
                plugin = page.Plugin;
                stream = page.GetHtmlStream();
            }

            if (plugin == null)
            {
                var altPage = GetPluginPages().FirstOrDefault(p => string.Equals(p.Item1.Name, name, StringComparison.OrdinalIgnoreCase));
                if (altPage != null)
                {
                    plugin = altPage.Item2;
                    stream = plugin.GetType().Assembly.GetManifestResourceStream(altPage.Item1.EmbeddedResourcePath);

                    isJs = string.Equals(Path.GetExtension(altPage.Item1.EmbeddedResourcePath), ".js", StringComparison.OrdinalIgnoreCase);
                    isTemplate = altPage.Item1.EmbeddedResourcePath.EndsWith(".template.html", StringComparison.Ordinal);
                }
            }

            if (plugin != null && stream != null)
            {
                if (isJs)
                {
                    return File(stream, MimeTypes.GetMimeType("page.js"));
                }

                if (isTemplate)
                {
                    return File(stream, MimeTypes.GetMimeType("page.html"));
                }

                return File(stream, MimeTypes.GetMimeType("page.html"));
            }

            return NotFound();
        }

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

        private IEnumerable<Tuple<PluginPageInfo, IPlugin>> GetPluginPages(IPlugin plugin)
        {
            if (!(plugin is IHasWebPages hasWebPages))
            {
                return new List<Tuple<PluginPageInfo, IPlugin>>();
            }

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

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