using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using Bit.Core;
using Bit.Core.Models.Api.Public;
using Bit.Core.Models.Business;
using Bit.Core.Repositories;
using Bit.Core.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace Bit.Api.Public.Controllers
{
    [Route("public/members")]
    [Authorize("Organization")]
    public class MembersController : Controller
    {
        private readonly IOrganizationUserRepository _organizationUserRepository;
        private readonly IGroupRepository _groupRepository;
        private readonly IOrganizationService _organizationService;
        private readonly IUserService _userService;
        private readonly CurrentContext _currentContext;

        public MembersController(
            IOrganizationUserRepository organizationUserRepository,
            IGroupRepository groupRepository,
            IOrganizationService organizationService,
            IUserService userService,
            CurrentContext currentContext)
        {
            _organizationUserRepository = organizationUserRepository;
            _groupRepository = groupRepository;
            _organizationService = organizationService;
            _userService = userService;
            _currentContext = currentContext;
        }

        /// <summary>
        /// Retrieve a member.
        /// </summary>
        /// <remarks>
        /// Retrieves the details of an existing member of the organization. You need only supply the
        /// unique member identifier that was returned upon member creation.
        /// </remarks>
        /// <param name="id">The identifier of the member to be retrieved.</param>
        [HttpGet("{id}")]
        [ProducesResponseType(typeof(MemberResponseModel), (int)HttpStatusCode.OK)]
        [ProducesResponseType((int)HttpStatusCode.NotFound)]
        public async Task<IActionResult> Get(Guid id)
        {
            var userDetails = await _organizationUserRepository.GetDetailsByIdWithCollectionsAsync(id);
            var orgUser = userDetails?.Item1;
            if (orgUser == null || orgUser.OrganizationId != _currentContext.OrganizationId)
            {
                return new NotFoundResult();
            }
            var response = new MemberResponseModel(orgUser, await _userService.TwoFactorIsEnabledAsync(orgUser),
                userDetails.Item2);
            return new JsonResult(response);
        }

        /// <summary>
        /// Retrieve a member's group ids
        /// </summary>
        /// <remarks>
        /// Retrieves the unique identifiers for all groups that are associated with this member. You need only
        /// supply the unique member identifier that was returned upon member creation.
        /// </remarks>
        /// <param name="id">The identifier of the member to be retrieved.</param>
        [HttpGet("{id}/group-ids")]
        [ProducesResponseType(typeof(HashSet<Guid>), (int)HttpStatusCode.OK)]
        [ProducesResponseType((int)HttpStatusCode.NotFound)]
        public async Task<IActionResult> GetGroupIds(Guid id)
        {
            var orgUser = await _organizationUserRepository.GetByIdAsync(id);
            if (orgUser == null || orgUser.OrganizationId != _currentContext.OrganizationId)
            {
                return new NotFoundResult();
            }
            var groupIds = await _groupRepository.GetManyIdsByUserIdAsync(id);
            return new JsonResult(groupIds);
        }

        /// <summary>
        /// List all members.
        /// </summary>
        /// <remarks>
        /// Returns a list of your organization's members.
        /// Member objects listed in this call do not include information about their associated collections.
        /// </remarks>
        [HttpGet]
        [ProducesResponseType(typeof(ListResponseModel<MemberResponseModel>), (int)HttpStatusCode.OK)]
        public async Task<IActionResult> List()
        {
            var users = await _organizationUserRepository.GetManyDetailsByOrganizationAsync(
                _currentContext.OrganizationId.Value);
            // TODO: Get all CollectionUser associations for the organization and marry them up here for the response.
            var memberResponsesTasks = users.Select(async u => new MemberResponseModel(u,
                await _userService.TwoFactorIsEnabledAsync(u), null));
            var memberResponses = await Task.WhenAll(memberResponsesTasks);
            var response = new ListResponseModel<MemberResponseModel>(memberResponses);
            return new JsonResult(response);
        }

        /// <summary>
        /// Create a member.
        /// </summary>
        /// <remarks>
        /// Creates a new member object by inviting a user to the organization.
        /// </remarks>
        /// <param name="model">The request model.</param>
        [HttpPost]
        [ProducesResponseType(typeof(MemberResponseModel), (int)HttpStatusCode.OK)]
        [ProducesResponseType(typeof(ErrorResponseModel), (int)HttpStatusCode.BadRequest)]
        public async Task<IActionResult> Post([FromBody]MemberCreateRequestModel model)
        {
            var associations = model.Collections?.Select(c => c.ToSelectionReadOnly());
            var invite = new OrganizationUserInvite
            {
                Emails = new List<string> { model.Email },
                Type = model.Type.Value,
                AccessAll = model.AccessAll.Value,
                Collections = associations
            };
            var userPromise = await _organizationService.InviteUserAsync(_currentContext.OrganizationId.Value, null, model.ExternalId, invite);
            var user = userPromise.FirstOrDefault();
            var response = new MemberResponseModel(user, associations);
            return new JsonResult(response);
        }

        /// <summary>
        /// Update a member.
        /// </summary>
        /// <remarks>
        /// Updates the specified member object. If a property is not provided,
        /// the value of the existing property will be reset.
        /// </remarks>
        /// <param name="id">The identifier of the member to be updated.</param>
        /// <param name="model">The request model.</param>
        [HttpPut("{id}")]
        [ProducesResponseType(typeof(MemberResponseModel), (int)HttpStatusCode.OK)]
        [ProducesResponseType(typeof(ErrorResponseModel), (int)HttpStatusCode.BadRequest)]
        [ProducesResponseType((int)HttpStatusCode.NotFound)]
        public async Task<IActionResult> Put(Guid id, [FromBody]MemberUpdateRequestModel model)
        {
            var existingUser = await _organizationUserRepository.GetByIdAsync(id);
            if (existingUser == null || existingUser.OrganizationId != _currentContext.OrganizationId)
            {
                return new NotFoundResult();
            }
            var updatedUser = model.ToOrganizationUser(existingUser);
            var associations = model.Collections?.Select(c => c.ToSelectionReadOnly());
            await _organizationService.SaveUserAsync(updatedUser, null, associations);
            MemberResponseModel response = null;
            if (existingUser.UserId.HasValue)
            {
                var existingUserDetails = await _organizationUserRepository.GetDetailsByIdAsync(id);
                response = new MemberResponseModel(existingUserDetails,
                    await _userService.TwoFactorIsEnabledAsync(existingUserDetails), associations);
            }
            else
            {
                response = new MemberResponseModel(updatedUser, associations);
            }
            return new JsonResult(response);
        }

        /// <summary>
        /// Update a member's groups.
        /// </summary>
        /// <remarks>
        /// Updates the specified member's group associations.
        /// </remarks>
        /// <param name="id">The identifier of the member to be updated.</param>
        /// <param name="model">The request model.</param>
        [HttpPut("{id}/group-ids")]
        [ProducesResponseType((int)HttpStatusCode.OK)]
        [ProducesResponseType(typeof(ErrorResponseModel), (int)HttpStatusCode.BadRequest)]
        [ProducesResponseType((int)HttpStatusCode.NotFound)]
        public async Task<IActionResult> PutGroupIds(Guid id, [FromBody]UpdateGroupIdsRequestModel model)
        {
            var existingUser = await _organizationUserRepository.GetByIdAsync(id);
            if (existingUser == null || existingUser.OrganizationId != _currentContext.OrganizationId)
            {
                return new NotFoundResult();
            }
            await _organizationService.UpdateUserGroupsAsync(existingUser, model.GroupIds, null);
            return new OkResult();
        }

        /// <summary>
        /// Delete a member.
        /// </summary>
        /// <remarks>
        /// Permanently deletes a member from the organization. This cannot be undone.
        /// The user account will still remain. The user is only removed from the organization.
        /// </remarks>
        /// <param name="id">The identifier of the member to be deleted.</param>
        [HttpDelete("{id}")]
        [ProducesResponseType((int)HttpStatusCode.OK)]
        [ProducesResponseType((int)HttpStatusCode.NotFound)]
        public async Task<IActionResult> Delete(Guid id)
        {
            var user = await _organizationUserRepository.GetByIdAsync(id);
            if (user == null || user.OrganizationId != _currentContext.OrganizationId)
            {
                return new NotFoundResult();
            }
            await _organizationService.DeleteUserAsync(_currentContext.OrganizationId.Value, id, null);
            return new OkResult();
        }

        /// <summary>
        /// Re-invite a member.
        /// </summary>
        /// <remarks>
        /// Re-sends the invitation email to an organization member.
        /// </remarks>
        /// <param name="id">The identifier of the member to re-invite.</param>
        [HttpPost("{id}/reinvite")]
        [ProducesResponseType((int)HttpStatusCode.OK)]
        [ProducesResponseType(typeof(ErrorResponseModel), (int)HttpStatusCode.BadRequest)]
        [ProducesResponseType((int)HttpStatusCode.NotFound)]
        public async Task<IActionResult> PostReinvite(Guid id)
        {
            var existingUser = await _organizationUserRepository.GetByIdAsync(id);
            if (existingUser == null || existingUser.OrganizationId != _currentContext.OrganizationId)
            {
                return new NotFoundResult();
            }
            await _organizationService.ResendInviteAsync(_currentContext.OrganizationId.Value, null, id);
            return new OkResult();
        }
    }
}