using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Localization;

using PrivaPub.ClientModels;
using PrivaPub.ClientModels.Group;
using PrivaPub.Extensions;
using PrivaPub.Resources;
using PrivaPub.Services;

namespace PrivaPub.Controllers.ClientToServer
{
	[ApiController,
		Route("clientapi/group"),
		Authorize(Policy = Policies.IsUser)]
	public class GroupController : ControllerBase
	{
		readonly IGroupUsersService _groupUsersService;
		readonly IStringLocalizer _localizer;

		public GroupController(IGroupUsersService groupUsersService, IStringLocalizer<GenericRes> localizer)
		{
			_groupUsersService = groupUsersService;
			_localizer = localizer;
		}

		[HttpGet, Route("/clientapi/group/list")]
		public async Task<IActionResult> List([FromQuery] string avatarId, CancellationToken token) =>
			Answer(await _groupUsersService.GetGroups(User.GetUserId(), avatarId, token));

		[HttpPost, Route("/clientapi/group/insert")]
		public async Task<IActionResult> Insert(InsertGroupForm form, CancellationToken token) =>
			!ModelState.IsValid ? Invalid() : Answer(await _groupUsersService.InsertGroup(User.GetUserId(), form, token));

		[HttpPost, Route("/clientapi/group/update")]
		public async Task<IActionResult> Update(UpdateGroupForm form, CancellationToken token) =>
			!ModelState.IsValid ? Invalid() : Answer(await _groupUsersService.UpdateGroup(User.GetUserId(), form, token));

		[HttpPost, Route("/clientapi/group/join")]
		public async Task<IActionResult> Join(JoinGroupForm form, CancellationToken token) =>
			!ModelState.IsValid ? Invalid() : Answer(await _groupUsersService.JoinGroup(User.GetUserId(), form, token));

		[HttpPost, Route("/clientapi/group/leave")]
		public async Task<IActionResult> Leave(GroupMembershipForm form, CancellationToken token) =>
			!ModelState.IsValid ? Invalid() : Answer(await _groupUsersService.LeaveGroup(User.GetUserId(), form, token));

		[HttpPost, Route("/clientapi/group/approve")]
		public async Task<IActionResult> Approve(GroupMembershipForm form, CancellationToken token) =>
			!ModelState.IsValid ? Invalid() : Answer(await _groupUsersService.ApproveMember(User.GetUserId(), form, token));

		[HttpGet, Route("/clientapi/group/members")]
		public async Task<IActionResult> Members([FromQuery] string avatarId, [FromQuery] string groupId, CancellationToken token) =>
			Answer(await _groupUsersService.GetMembers(User.GetUserId(), avatarId, groupId, token));

		[HttpPost, Route("/clientapi/group/reject")]
		public async Task<IActionResult> Reject(GroupMembershipForm form, CancellationToken token) =>
			!ModelState.IsValid ? Invalid() : Answer(await _groupUsersService.RejectMember(User.GetUserId(), form, token));

		[HttpPost, Route("/clientapi/group/remove")]
		public async Task<IActionResult> Remove(GroupMembershipForm form, CancellationToken token) =>
			!ModelState.IsValid ? Invalid() : Answer(await _groupUsersService.RemoveMember(User.GetUserId(), form, token));

		// the group's owner deletes it, with the login's password (R6): its members and followers are told, its name stays
		// taken (GroupRemoval)
		[HttpPost, Route("/clientapi/group/delete"), Microsoft.AspNetCore.RateLimiting.EnableRateLimiting(Infrastructure.RateLimiting.Accounts)]
		public async Task<IActionResult> Delete(DeleteGroupForm form, [FromServices] IRootUsersService users, [FromServices] IGroupRemoval groups,
			[FromServices] StaticServices.DbEntities dbEntities, CancellationToken token)
		{
			if (!ModelState.IsValid)
				return Invalid();
			var rootId = User.GetUserId();
			if (!await users.PasswordMatches(rootId, form.Password))
				return StatusCode(StatusCodes.Status403Forbidden, new WebResult().Invalidate(_localizer[RootUsersService.NoMatch], StatusCodes.Status403Forbidden));
			var owns = await dbEntities.RootToAvatars.Match(ra => ra.RootId == rootId && ra.AvatarId == form.AvatarId).ExecuteAnyAsync(token);
			var group = owns ? await dbEntities.Groups.MatchID(form.GroupId).Match(g => !g.DeletionAt.HasValue).ExecuteFirstAsync(token) : default;
			if (group == default)
				return NotFound(new WebResult().Invalidate(_localizer["Group not found."], StatusCodes.Status404NotFound));
			if (group.OwnerAvatarId != form.AvatarId)
				return StatusCode(StatusCodes.Status403Forbidden, new WebResult().Invalidate(_localizer["Only the group's owner can delete it."], StatusCodes.Status403Forbidden));
			await groups.Remove(group.ID, CancellationToken.None);
			return Ok();
		}

		IActionResult Invalid() => BadRequest(new WebResult().Invalidate(_localizer["Invalid model."]));

		IActionResult Answer(WebResult result) => result.IsValid ? Ok(result.Data) : StatusCode(result.StatusCode, result);
	}
}