// Copyright Epic Games, Inc. All Rights Reserved.

using System.Net.Mime;
using System.Threading.Tasks;
using EpicGames.AspNet;
using EpicGames.Horde.Storage;
using Jupiter.Implementation;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using ContentId = Jupiter.Implementation.ContentId;

namespace Jupiter.Controllers
{
	[ApiController]
	[FormatFilter]
	[Produces(MediaTypeNames.Application.Json, MediaTypeNames.Application.Octet, CustomMediaTypeNames.UnrealCompactBinary)]
	[Route("api/v1/content-id")]
	[Authorize]
	public class ContentIdController : ControllerBase
	{
		private readonly IRequestHelper _requestHelper;
		private readonly IContentIdStore _contentIdStore;

		public ContentIdController(IRequestHelper requestHelper, IContentIdStore contentIdStore)
		{
			_requestHelper = requestHelper;
			_contentIdStore = contentIdStore;
		}

		/// <summary>
		/// Returns which blobs a content id maps to
		/// </summary>
		/// <param name="ns">Namespace. Each namespace is completely separated from each other. Use for different types of data that is never expected to be similar (between two different games for instance). Example: `uc4.ddc`</param>
		/// <param name="contentId">The content id to resolve </param>
		[HttpGet("{ns}/{contentId}.{format?}", Order = 500)]
		[ProducesDefaultResponseType]
		[ProducesResponseType(type: typeof(ProblemDetails), 400)]
		public async Task<IActionResult> ResolveAsync(NamespaceId ns, ContentId contentId)
		{
			ActionResult? result = await _requestHelper.HasAccessToNamespaceAsync(User, Request, ns, new[] { JupiterAclAction.ReadObject });
			if (result != null)
			{
				return result;
			}
			BlobId[]? blobs = await _contentIdStore.ResolveAsync(ns, contentId, mustBeContentId: true);

			if (blobs == null)
			{
				return NotFound(new ProblemDetails { Title = $"Unable to resolve content id {contentId} ({ns})." });
			}

			return Ok(new ResolvedContentIdResponse(blobs));
		}

		/// <summary>
		/// Update a content id mapping
		/// </summary>
		/// <param name="ns">Namespace. Each namespace is completely separated from each other. Use for different types of data that is never expected to be similar (between two different games for instance). Example: `uc4.ddc`</param>
		/// <param name="contentId">The content id to resolve </param>
		/// <param name="blobIdentifier">The blob identifier to map the content id to</param>
		/// <param name="contentWeight">The weight of this mapping, higher means more important</param>
		[HttpPut("{ns}/{contentId}/update/{blobIdentifier}/{contentWeight}", Order = 500)]
		[ProducesDefaultResponseType]
		[ProducesResponseType(type: typeof(ProblemDetails), 400)]
		public async Task<IActionResult> UpdateContentIdMappingAsync(NamespaceId ns, ContentId contentId, BlobId blobIdentifier, int contentWeight)
		{
			ActionResult? result = await _requestHelper.HasAccessToNamespaceAsync(User, Request, ns, new[] { JupiterAclAction.WriteObject });
			if (result != null)
			{
				return result;
			}
			await _contentIdStore.PutAsync(ns, contentId, new BlobId[] {blobIdentifier}, contentWeight);

			return Ok();
		}
	}

	public class ResolvedContentIdResponse
	{
		public BlobId[] Blobs { get; set; }

		public ResolvedContentIdResponse(BlobId[] blobs)
		{
			Blobs = blobs;
		}
	}
}