using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Jellyfin.Api.Constants;
using Jellyfin.Api.Helpers;
using Jellyfin.Api.ModelBinders;
using Jellyfin.Api.Models.SessionDtos;
using Jellyfin.Data.Enums;
using MediaBrowser.Controller.Devices;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Net;
using MediaBrowser.Controller.Session;
using MediaBrowser.Model.Dto;
using MediaBrowser.Model.Session;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace Jellyfin.Api.Controllers
{
    /// <summary>
    /// The session controller.
    /// </summary>
    [Route("")]
    public class SessionController : BaseJellyfinApiController
    {
        private readonly ISessionManager _sessionManager;
        private readonly IUserManager _userManager;
        private readonly IAuthorizationContext _authContext;
        private readonly IDeviceManager _deviceManager;

        /// <summary>
        /// Initializes a new instance of the <see cref="SessionController"/> class.
        /// </summary>
        /// <param name="sessionManager">Instance of <see cref="ISessionManager"/> interface.</param>
        /// <param name="userManager">Instance of <see cref="IUserManager"/> interface.</param>
        /// <param name="authContext">Instance of <see cref="IAuthorizationContext"/> interface.</param>
        /// <param name="deviceManager">Instance of <see cref="IDeviceManager"/> interface.</param>
        public SessionController(
            ISessionManager sessionManager,
            IUserManager userManager,
            IAuthorizationContext authContext,
            IDeviceManager deviceManager)
        {
            _sessionManager = sessionManager;
            _userManager = userManager;
            _authContext = authContext;
            _deviceManager = deviceManager;
        }

        /// <summary>
        /// Gets a list of sessions.
        /// </summary>
        /// <param name="controllableByUserId">Filter by sessions that a given user is allowed to remote control.</param>
        /// <param name="deviceId">Filter by device Id.</param>
        /// <param name="activeWithinSeconds">Optional. Filter by sessions that were active in the last n seconds.</param>
        /// <response code="200">List of sessions returned.</response>
        /// <returns>An <see cref="IEnumerable{SessionInfo}"/> with the available sessions.</returns>
        [HttpGet("Sessions")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status200OK)]
        public ActionResult<IEnumerable<SessionInfo>> GetSessions(
            [FromQuery] Guid? controllableByUserId,
            [FromQuery] string? deviceId,
            [FromQuery] int? activeWithinSeconds)
        {
            var result = _sessionManager.Sessions;

            if (!string.IsNullOrEmpty(deviceId))
            {
                result = result.Where(i => string.Equals(i.DeviceId, deviceId, StringComparison.OrdinalIgnoreCase));
            }

            if (controllableByUserId.HasValue && !controllableByUserId.Equals(Guid.Empty))
            {
                result = result.Where(i => i.SupportsRemoteControl);

                var user = _userManager.GetUserById(controllableByUserId.Value);

                if (!user.HasPermission(PermissionKind.EnableRemoteControlOfOtherUsers))
                {
                    result = result.Where(i => i.UserId.Equals(Guid.Empty) || i.ContainsUser(controllableByUserId.Value));
                }

                if (!user.HasPermission(PermissionKind.EnableSharedDeviceControl))
                {
                    result = result.Where(i => !i.UserId.Equals(Guid.Empty));
                }

                if (activeWithinSeconds.HasValue && activeWithinSeconds.Value > 0)
                {
                    var minActiveDate = DateTime.UtcNow.AddSeconds(0 - activeWithinSeconds.Value);
                    result = result.Where(i => i.LastActivityDate >= minActiveDate);
                }

                result = result.Where(i =>
                {
                    if (!string.IsNullOrWhiteSpace(i.DeviceId))
                    {
                        if (!_deviceManager.CanAccessDevice(user, i.DeviceId))
                        {
                            return false;
                        }
                    }

                    return true;
                });
            }

            return Ok(result);
        }

        /// <summary>
        /// Instructs a session to browse to an item or view.
        /// </summary>
        /// <param name="sessionId">The session Id.</param>
        /// <param name="itemType">The type of item to browse to.</param>
        /// <param name="itemId">The Id of the item.</param>
        /// <param name="itemName">The name of the item.</param>
        /// <response code="204">Instruction sent to session.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/{sessionId}/Viewing")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> DisplayContent(
            [FromRoute, Required] string sessionId,
            [FromQuery, Required] string itemType,
            [FromQuery, Required] string itemId,
            [FromQuery, Required] string itemName)
        {
            var command = new BrowseRequest
            {
                ItemId = itemId,
                ItemName = itemName,
                ItemType = itemType
            };

            await _sessionManager.SendBrowseCommand(
                await RequestHelpers.GetSessionId(_sessionManager, _authContext, Request).ConfigureAwait(false),
                sessionId,
                command,
                CancellationToken.None)
                .ConfigureAwait(false);

            return NoContent();
        }

        /// <summary>
        /// Instructs a session to play an item.
        /// </summary>
        /// <param name="sessionId">The session id.</param>
        /// <param name="playCommand">The type of play command to issue (PlayNow, PlayNext, PlayLast). Clients who have not yet implemented play next and play last may play now.</param>
        /// <param name="itemIds">The ids of the items to play, comma delimited.</param>
        /// <param name="startPositionTicks">The starting position of the first item.</param>
        /// <param name="mediaSourceId">Optional. The media source id.</param>
        /// <param name="audioStreamIndex">Optional. The index of the audio stream to play.</param>
        /// <param name="subtitleStreamIndex">Optional. The index of the subtitle stream to play.</param>
        /// <param name="startIndex">Optional. The start index.</param>
        /// <response code="204">Instruction sent to session.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/{sessionId}/Playing")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> Play(
            [FromRoute, Required] string sessionId,
            [FromQuery, Required] PlayCommand playCommand,
            [FromQuery, Required, ModelBinder(typeof(CommaDelimitedArrayModelBinder))] Guid[] itemIds,
            [FromQuery] long? startPositionTicks,
            [FromQuery] string? mediaSourceId,
            [FromQuery] int? audioStreamIndex,
            [FromQuery] int? subtitleStreamIndex,
            [FromQuery] int? startIndex)
        {
            var playRequest = new PlayRequest
            {
                ItemIds = itemIds,
                StartPositionTicks = startPositionTicks,
                PlayCommand = playCommand,
                MediaSourceId = mediaSourceId,
                AudioStreamIndex = audioStreamIndex,
                SubtitleStreamIndex = subtitleStreamIndex,
                StartIndex = startIndex
            };

            await _sessionManager.SendPlayCommand(
                await RequestHelpers.GetSessionId(_sessionManager, _authContext, Request).ConfigureAwait(false),
                sessionId,
                playRequest,
                CancellationToken.None)
                .ConfigureAwait(false);

            return NoContent();
        }

        /// <summary>
        /// Issues a playstate command to a client.
        /// </summary>
        /// <param name="sessionId">The session id.</param>
        /// <param name="command">The <see cref="PlaystateCommand"/>.</param>
        /// <param name="seekPositionTicks">The optional position ticks.</param>
        /// <param name="controllingUserId">The optional controlling user id.</param>
        /// <response code="204">Playstate command sent to session.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/{sessionId}/Playing/{command}")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> SendPlaystateCommand(
            [FromRoute, Required] string sessionId,
            [FromRoute, Required] PlaystateCommand command,
            [FromQuery] long? seekPositionTicks,
            [FromQuery] string? controllingUserId)
        {
            await _sessionManager.SendPlaystateCommand(
                await RequestHelpers.GetSessionId(_sessionManager, _authContext, Request).ConfigureAwait(false),
                sessionId,
                new PlaystateRequest()
                {
                    Command = command,
                    ControllingUserId = controllingUserId,
                    SeekPositionTicks = seekPositionTicks,
                },
                CancellationToken.None)
                .ConfigureAwait(false);

            return NoContent();
        }

        /// <summary>
        /// Issues a system command to a client.
        /// </summary>
        /// <param name="sessionId">The session id.</param>
        /// <param name="command">The command to send.</param>
        /// <response code="204">System command sent to session.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/{sessionId}/System/{command}")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> SendSystemCommand(
            [FromRoute, Required] string sessionId,
            [FromRoute, Required] GeneralCommandType command)
        {
            var currentSession = await RequestHelpers.GetSession(_sessionManager, _authContext, Request).ConfigureAwait(false);
            var generalCommand = new GeneralCommand
            {
                Name = command,
                ControllingUserId = currentSession.UserId
            };

            await _sessionManager.SendGeneralCommand(currentSession.Id, sessionId, generalCommand, CancellationToken.None);

            return NoContent();
        }

        /// <summary>
        /// Issues a general command to a client.
        /// </summary>
        /// <param name="sessionId">The session id.</param>
        /// <param name="command">The command to send.</param>
        /// <response code="204">General command sent to session.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/{sessionId}/Command/{command}")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> SendGeneralCommand(
            [FromRoute, Required] string sessionId,
            [FromRoute, Required] GeneralCommandType command)
        {
            var currentSession = await RequestHelpers.GetSession(_sessionManager, _authContext, Request).ConfigureAwait(false);

            var generalCommand = new GeneralCommand
            {
                Name = command,
                ControllingUserId = currentSession.UserId
            };

            await _sessionManager.SendGeneralCommand(currentSession.Id, sessionId, generalCommand, CancellationToken.None)
                .ConfigureAwait(false);

            return NoContent();
        }

        /// <summary>
        /// Issues a full general command to a client.
        /// </summary>
        /// <param name="sessionId">The session id.</param>
        /// <param name="command">The <see cref="GeneralCommand"/>.</param>
        /// <response code="204">Full general command sent to session.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/{sessionId}/Command")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> SendFullGeneralCommand(
            [FromRoute, Required] string sessionId,
            [FromBody, Required] GeneralCommand command)
        {
            var currentSession = await RequestHelpers.GetSession(_sessionManager, _authContext, Request)
                .ConfigureAwait(false);

            if (command == null)
            {
                throw new ArgumentException("Request body may not be null");
            }

            command.ControllingUserId = currentSession.UserId;

            await _sessionManager.SendGeneralCommand(
                currentSession.Id,
                sessionId,
                command,
                CancellationToken.None)
                .ConfigureAwait(false);

            return NoContent();
        }

        /// <summary>
        /// Issues a command to a client to display a message to the user.
        /// </summary>
        /// <param name="sessionId">The session id.</param>
        /// <param name="command">The <see cref="MessageCommand" /> object containing Header, Message Text, and TimeoutMs.</param>
        /// <response code="204">Message sent.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/{sessionId}/Message")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> SendMessageCommand(
            [FromRoute, Required] string sessionId,
            [FromBody, Required] MessageCommand command)
        {
            if (string.IsNullOrWhiteSpace(command.Header))
            {
                command.Header = "Message from Server";
            }

            await _sessionManager.SendMessageCommand(
                await RequestHelpers.GetSessionId(_sessionManager, _authContext, Request).ConfigureAwait(false),
                sessionId,
                command,
                CancellationToken.None)
                .ConfigureAwait(false);

            return NoContent();
        }

        /// <summary>
        /// Adds an additional user to a session.
        /// </summary>
        /// <param name="sessionId">The session id.</param>
        /// <param name="userId">The user id.</param>
        /// <response code="204">User added to session.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/{sessionId}/User/{userId}")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public ActionResult AddUserToSession(
            [FromRoute, Required] string sessionId,
            [FromRoute, Required] Guid userId)
        {
            _sessionManager.AddAdditionalUser(sessionId, userId);
            return NoContent();
        }

        /// <summary>
        /// Removes an additional user from a session.
        /// </summary>
        /// <param name="sessionId">The session id.</param>
        /// <param name="userId">The user id.</param>
        /// <response code="204">User removed from session.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpDelete("Sessions/{sessionId}/User/{userId}")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public ActionResult RemoveUserFromSession(
            [FromRoute, Required] string sessionId,
            [FromRoute, Required] Guid userId)
        {
            _sessionManager.RemoveAdditionalUser(sessionId, userId);
            return NoContent();
        }

        /// <summary>
        /// Updates capabilities for a device.
        /// </summary>
        /// <param name="id">The session id.</param>
        /// <param name="playableMediaTypes">A list of playable media types, comma delimited. Audio, Video, Book, Photo.</param>
        /// <param name="supportedCommands">A list of supported remote control commands, comma delimited.</param>
        /// <param name="supportsMediaControl">Determines whether media can be played remotely..</param>
        /// <param name="supportsSync">Determines whether sync is supported.</param>
        /// <param name="supportsPersistentIdentifier">Determines whether the device supports a unique identifier.</param>
        /// <response code="204">Capabilities posted.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/Capabilities")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> PostCapabilities(
            [FromQuery] string? id,
            [FromQuery, ModelBinder(typeof(CommaDelimitedArrayModelBinder))] string[] playableMediaTypes,
            [FromQuery, ModelBinder(typeof(CommaDelimitedArrayModelBinder))] GeneralCommandType[] supportedCommands,
            [FromQuery] bool supportsMediaControl = false,
            [FromQuery] bool supportsSync = false,
            [FromQuery] bool supportsPersistentIdentifier = true)
        {
            if (string.IsNullOrWhiteSpace(id))
            {
                id = await RequestHelpers.GetSessionId(_sessionManager, _authContext, Request).ConfigureAwait(false);
            }

            _sessionManager.ReportCapabilities(id, new ClientCapabilities
            {
                PlayableMediaTypes = playableMediaTypes,
                SupportedCommands = supportedCommands,
                SupportsMediaControl = supportsMediaControl,
                SupportsSync = supportsSync,
                SupportsPersistentIdentifier = supportsPersistentIdentifier
            });
            return NoContent();
        }

        /// <summary>
        /// Updates capabilities for a device.
        /// </summary>
        /// <param name="id">The session id.</param>
        /// <param name="capabilities">The <see cref="ClientCapabilities"/>.</param>
        /// <response code="204">Capabilities updated.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/Capabilities/Full")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> PostFullCapabilities(
            [FromQuery] string? id,
            [FromBody, Required] ClientCapabilitiesDto capabilities)
        {
            if (string.IsNullOrWhiteSpace(id))
            {
                id = await RequestHelpers.GetSessionId(_sessionManager, _authContext, Request).ConfigureAwait(false);
            }

            _sessionManager.ReportCapabilities(id, capabilities.ToClientCapabilities());

            return NoContent();
        }

        /// <summary>
        /// Reports that a session is viewing an item.
        /// </summary>
        /// <param name="sessionId">The session id.</param>
        /// <param name="itemId">The item id.</param>
        /// <response code="204">Session reported to server.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/Viewing")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> ReportViewing(
            [FromQuery] string? sessionId,
            [FromQuery, Required] string? itemId)
        {
            string session = sessionId ?? await RequestHelpers.GetSessionId(_sessionManager, _authContext, Request).ConfigureAwait(false);

            _sessionManager.ReportNowViewingItem(session, itemId);
            return NoContent();
        }

        /// <summary>
        /// Reports that a session has ended.
        /// </summary>
        /// <response code="204">Session end reported to server.</response>
        /// <returns>A <see cref="NoContentResult"/>.</returns>
        [HttpPost("Sessions/Logout")]
        [Authorize(Policy = Policies.DefaultAuthorization)]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<ActionResult> ReportSessionEnded()
        {
            AuthorizationInfo auth = await _authContext.GetAuthorizationInfo(Request).ConfigureAwait(false);

            await _sessionManager.Logout(auth.Token).ConfigureAwait(false);
            return NoContent();
        }

        /// <summary>
        /// Get all auth providers.
        /// </summary>
        /// <response code="200">Auth providers retrieved.</response>
        /// <returns>An <see cref="IEnumerable{NameIdPair}"/> with the auth providers.</returns>
        [HttpGet("Auth/Providers")]
        [Authorize(Policy = Policies.RequiresElevation)]
        [ProducesResponseType(StatusCodes.Status200OK)]
        public ActionResult<IEnumerable<NameIdPair>> GetAuthProviders()
        {
            return _userManager.GetAuthenticationProviders();
        }

        /// <summary>
        /// Get all password reset providers.
        /// </summary>
        /// <response code="200">Password reset providers retrieved.</response>
        /// <returns>An <see cref="IEnumerable{NameIdPair}"/> with the password reset providers.</returns>
        [HttpGet("Auth/PasswordResetProviders")]
        [ProducesResponseType(StatusCodes.Status200OK)]
        [Authorize(Policy = Policies.RequiresElevation)]
        public ActionResult<IEnumerable<NameIdPair>> GetPasswordResetProviders()
        {
            return _userManager.GetPasswordResetProviders();
        }
    }
}