using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;
using Jellyfin.Api.Constants;
using Jellyfin.Api.Models.StartupDtos;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Library;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace Jellyfin.Api.Controllers
{
    /// <summary>
    /// The startup wizard controller.
    /// </summary>
    [Authorize(Policy = Policies.FirstTimeSetupOrElevated)]
    public class StartupController : BaseJellyfinApiController
    {
        private readonly IServerConfigurationManager _config;
        private readonly IUserManager _userManager;

        /// <summary>
        /// Initializes a new instance of the <see cref="StartupController" /> class.
        /// </summary>
        /// <param name="config">The server configuration manager.</param>
        /// <param name="userManager">The user manager.</param>
        public StartupController(IServerConfigurationManager config, IUserManager userManager)
        {
            _config = config;
            _userManager = userManager;
        }

        /// <summary>
        /// Completes the startup wizard.
        /// </summary>
        /// <response code="204">Startup wizard completed.</response>
        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
        [HttpPost("Complete")]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public ActionResult CompleteWizard()
        {
            _config.Configuration.IsStartupWizardCompleted = true;
            _config.SaveConfiguration();
            return NoContent();
        }

        /// <summary>
        /// Gets the initial startup wizard configuration.
        /// </summary>
        /// <response code="200">Initial startup wizard configuration retrieved.</response>
        /// <returns>An <see cref="OkResult"/> containing the initial startup wizard configuration.</returns>
        [HttpGet("Configuration")]
        [ProducesResponseType(StatusCodes.Status200OK)]
        public ActionResult<StartupConfigurationDto> GetStartupConfiguration()
        {
            return new StartupConfigurationDto
            {
                UICulture = _config.Configuration.UICulture,
                MetadataCountryCode = _config.Configuration.MetadataCountryCode,
                PreferredMetadataLanguage = _config.Configuration.PreferredMetadataLanguage
            };
        }

        /// <summary>
        /// Sets the initial startup wizard configuration.
        /// </summary>
        /// <param name="startupConfiguration">The updated startup configuration.</param>
        /// <response code="204">Configuration saved.</response>
        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
        [HttpPost("Configuration")]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public ActionResult UpdateInitialConfiguration([FromBody, Required] StartupConfigurationDto startupConfiguration)
        {
            _config.Configuration.UICulture = startupConfiguration.UICulture;
            _config.Configuration.MetadataCountryCode = startupConfiguration.MetadataCountryCode;
            _config.Configuration.PreferredMetadataLanguage = startupConfiguration.PreferredMetadataLanguage;
            _config.SaveConfiguration();
            return NoContent();
        }

        /// <summary>
        /// Sets remote access and UPnP.
        /// </summary>
        /// <param name="startupRemoteAccessDto">The startup remote access dto.</param>
        /// <response code="204">Configuration saved.</response>
        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
        [HttpPost("RemoteAccess")]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public ActionResult SetRemoteAccess([FromBody, Required] StartupRemoteAccessDto startupRemoteAccessDto)
        {
            _config.Configuration.EnableRemoteAccess = startupRemoteAccessDto.EnableRemoteAccess;
            _config.Configuration.EnableUPnP = startupRemoteAccessDto.EnableAutomaticPortMapping;
            _config.SaveConfiguration();
            return NoContent();
        }

        /// <summary>
        /// Gets the first user.
        /// </summary>
        /// <response code="200">Initial user retrieved.</response>
        /// <returns>The first user.</returns>
        [HttpGet("User")]
        [HttpGet("FirstUser", Name = "GetFirstUser_2")]
        [ProducesResponseType(StatusCodes.Status200OK)]
        public async Task<StartupUserDto> GetFirstUser()
        {
            // TODO: Remove this method when startup wizard no longer requires an existing user.
            await _userManager.InitializeAsync().ConfigureAwait(false);
            var user = _userManager.Users.First();
            return new StartupUserDto
            {
                Name = user.Username,
                Password = user.Password
            };
        }

        /// <summary>
        /// Sets the user name and password.
        /// </summary>
        /// <param name="startupUserDto">The DTO containing username and password.</param>
        /// <response code="204">Updated user name and password.</response>
        /// <returns>
        /// A <see cref="Task" /> that represents the asynchronous update operation.
        /// The task result contains a <see cref="NoContentResult"/> indicating success.
        /// </returns>
        [HttpPost("User")]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> UpdateStartupUser([FromBody] StartupUserDto startupUserDto)
        {
            var user = _userManager.Users.First();

            user.Username = startupUserDto.Name;

            await _userManager.UpdateUserAsync(user).ConfigureAwait(false);

            if (!string.IsNullOrEmpty(startupUserDto.Password))
            {
                await _userManager.ChangePassword(user, startupUserDto.Password).ConfigureAwait(false);
            }

            return NoContent();
        }
    }
}