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.Repositories;
using Bit.Core.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace Bit.Api.Public.Controllers
{
    [Route("public/groups")]
    [Authorize("Organization")]
    public class GroupsController : Controller
    {
        private readonly IGroupRepository _groupRepository;
        private readonly IGroupService _groupService;
        private readonly CurrentContext _currentContext;

        public GroupsController(
            IGroupRepository groupRepository,
            IGroupService groupService,
            CurrentContext currentContext)
        {
            _groupRepository = groupRepository;
            _groupService = groupService;
            _currentContext = currentContext;
        }

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

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

        /// <summary>
        /// List all groups.
        /// </summary>
        /// <remarks>
        /// Returns a list of your organization's groups.
        /// Group objects listed in this call do not include information about their associated collections.
        /// </remarks>
        [HttpGet]
        [ProducesResponseType(typeof(ListResponseModel<GroupResponseModel>), (int)HttpStatusCode.OK)]
        public async Task<IActionResult> List()
        {
            var groups = await _groupRepository.GetManyByOrganizationIdAsync(_currentContext.OrganizationId.Value);
            // TODO: Get all CollectionGroup associations for the organization and marry them up here for the response.
            var groupResponses = groups.Select(g => new GroupResponseModel(g, null));
            var response = new ListResponseModel<GroupResponseModel>(groupResponses);
            return new JsonResult(response);
        }

        /// <summary>
        /// Create a group.
        /// </summary>
        /// <remarks>
        /// Creates a new group object.
        /// </remarks>
        /// <param name="model">The request model.</param>
        [HttpPost]
        [ProducesResponseType(typeof(GroupResponseModel), (int)HttpStatusCode.OK)]
        [ProducesResponseType(typeof(ErrorResponseModel), (int)HttpStatusCode.BadRequest)]
        public async Task<IActionResult> Post([FromBody]GroupCreateUpdateRequestModel model)
        {
            var group = model.ToGroup(_currentContext.OrganizationId.Value);
            var associations = model.Collections?.Select(c => c.ToSelectionReadOnly());
            await _groupService.SaveAsync(group, associations);
            var response = new GroupResponseModel(group, associations);
            return new JsonResult(response);
        }

        /// <summary>
        /// Update a group.
        /// </summary>
        /// <remarks>
        /// Updates the specified group object. If a property is not provided,
        /// the value of the existing property will be reset.
        /// </remarks>
        /// <param name="id">The identifier of the group to be updated.</param>
        /// <param name="model">The request model.</param>
        [HttpPut("{id}")]
        [ProducesResponseType(typeof(GroupResponseModel), (int)HttpStatusCode.OK)]
        [ProducesResponseType(typeof(ErrorResponseModel), (int)HttpStatusCode.BadRequest)]
        [ProducesResponseType((int)HttpStatusCode.NotFound)]
        public async Task<IActionResult> Put(Guid id, [FromBody]GroupCreateUpdateRequestModel model)
        {
            var existingGroup = await _groupRepository.GetByIdAsync(id);
            if(existingGroup == null || existingGroup.OrganizationId != _currentContext.OrganizationId)
            {
                return new NotFoundResult();
            }
            var updatedGroup = model.ToGroup(existingGroup);
            var associations = model.Collections?.Select(c => c.ToSelectionReadOnly());
            await _groupService.SaveAsync(updatedGroup, associations);
            var response = new GroupResponseModel(updatedGroup, associations);
            return new JsonResult(response);
        }

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

        /// <summary>
        /// Delete a group.
        /// </summary>
        /// <remarks>
        /// Permanently deletes a group. This cannot be undone.
        /// </remarks>
        /// <param name="id">The identifier of the group to be deleted.</param>
        [HttpDelete("{id}")]
        [ProducesResponseType((int)HttpStatusCode.OK)]
        [ProducesResponseType((int)HttpStatusCode.NotFound)]
        public async Task<IActionResult> Delete(Guid id)
        {
            var group = await _groupRepository.GetByIdAsync(id);
            if(group == null || group.OrganizationId != _currentContext.OrganizationId)
            {
                return new NotFoundResult();
            }
            await _groupRepository.DeleteAsync(group);
            return new OkResult();
        }
    }
}