using Bit.Core.Context;
using Bit.Core.Entities;
using Bit.Core.Enums;
using Bit.Core.Models;
using Bit.Core.Models.Api;
using Bit.Core.Repositories;
using Bit.Core.Settings;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;

namespace Bit.Core.Services;

public class RelayPushNotificationService : BaseIdentityClientService, IPushNotificationService
{
    private readonly IDeviceRepository _deviceRepository;
    private readonly IHttpContextAccessor _httpContextAccessor;

    public RelayPushNotificationService(
        IHttpClientFactory httpFactory,
        IDeviceRepository deviceRepository,
        GlobalSettings globalSettings,
        IHttpContextAccessor httpContextAccessor,
        ILogger<RelayPushNotificationService> logger)
        : base(
            httpFactory,
            globalSettings.PushRelayBaseUri,
            globalSettings.Installation.IdentityUri,
            "api.push",
            $"installation.{globalSettings.Installation.Id}",
            globalSettings.Installation.Key,
            logger)
    {
        _deviceRepository = deviceRepository;
        _httpContextAccessor = httpContextAccessor;
    }

    public async Task PushSyncCipherCreateAsync(Cipher cipher, IEnumerable<Guid> collectionIds)
    {
        await PushCipherAsync(cipher, PushType.SyncCipherCreate, collectionIds);
    }

    public async Task PushSyncCipherUpdateAsync(Cipher cipher, IEnumerable<Guid> collectionIds)
    {
        await PushCipherAsync(cipher, PushType.SyncCipherUpdate, collectionIds);
    }

    public async Task PushSyncCipherDeleteAsync(Cipher cipher)
    {
        await PushCipherAsync(cipher, PushType.SyncLoginDelete, null);
    }

    private async Task PushCipherAsync(Cipher cipher, PushType type, IEnumerable<Guid> collectionIds)
    {
        if (cipher.OrganizationId.HasValue)
        {
            // We cannot send org pushes since access logic is much more complicated than just the fact that they belong
            // to the organization. Potentially we could blindly send to just users that have the access all permission
            // device registration needs to be more granular to handle that appropriately. A more brute force approach could
            // me to send "full sync" push to all org users, but that has the potential to DDOS the API in bursts.

            // await SendPayloadToOrganizationAsync(cipher.OrganizationId.Value, type, message, true);
        }
        else if (cipher.UserId.HasValue)
        {
            var message = new SyncCipherPushNotification
            {
                Id = cipher.Id,
                UserId = cipher.UserId,
                OrganizationId = cipher.OrganizationId,
                RevisionDate = cipher.RevisionDate,
            };

            await SendPayloadToUserAsync(cipher.UserId.Value, type, message, true);
        }
    }

    public async Task PushSyncFolderCreateAsync(Folder folder)
    {
        await PushFolderAsync(folder, PushType.SyncFolderCreate);
    }

    public async Task PushSyncFolderUpdateAsync(Folder folder)
    {
        await PushFolderAsync(folder, PushType.SyncFolderUpdate);
    }

    public async Task PushSyncFolderDeleteAsync(Folder folder)
    {
        await PushFolderAsync(folder, PushType.SyncFolderDelete);
    }

    private async Task PushFolderAsync(Folder folder, PushType type)
    {
        var message = new SyncFolderPushNotification
        {
            Id = folder.Id,
            UserId = folder.UserId,
            RevisionDate = folder.RevisionDate
        };

        await SendPayloadToUserAsync(folder.UserId, type, message, true);
    }

    public async Task PushSyncCiphersAsync(Guid userId)
    {
        await PushUserAsync(userId, PushType.SyncCiphers);
    }

    public async Task PushSyncVaultAsync(Guid userId)
    {
        await PushUserAsync(userId, PushType.SyncVault);
    }

    public async Task PushSyncOrgKeysAsync(Guid userId)
    {
        await PushUserAsync(userId, PushType.SyncOrgKeys);
    }

    public async Task PushSyncSettingsAsync(Guid userId)
    {
        await PushUserAsync(userId, PushType.SyncSettings);
    }

    public async Task PushLogOutAsync(Guid userId)
    {
        await PushUserAsync(userId, PushType.LogOut);
    }

    private async Task PushUserAsync(Guid userId, PushType type)
    {
        var message = new UserPushNotification
        {
            UserId = userId,
            Date = DateTime.UtcNow
        };

        await SendPayloadToUserAsync(userId, type, message, false);
    }

    public async Task PushSyncSendCreateAsync(Send send)
    {
        await PushSendAsync(send, PushType.SyncSendCreate);
    }

    public async Task PushSyncSendUpdateAsync(Send send)
    {
        await PushSendAsync(send, PushType.SyncSendUpdate);
    }

    public async Task PushSyncSendDeleteAsync(Send send)
    {
        await PushSendAsync(send, PushType.SyncSendDelete);
    }

    private async Task PushSendAsync(Send send, PushType type)
    {
        if (send.UserId.HasValue)
        {
            var message = new SyncSendPushNotification
            {
                Id = send.Id,
                UserId = send.UserId.Value,
                RevisionDate = send.RevisionDate
            };

            await SendPayloadToUserAsync(message.UserId, type, message, true);
        }
    }

    private async Task SendPayloadToUserAsync(Guid userId, PushType type, object payload, bool excludeCurrentContext)
    {
        var request = new PushSendRequestModel
        {
            UserId = userId.ToString(),
            Type = type,
            Payload = payload
        };

        await AddCurrentContextAsync(request, excludeCurrentContext);
        await SendAsync(HttpMethod.Post, "push/send", request);
    }

    private async Task SendPayloadToOrganizationAsync(Guid orgId, PushType type, object payload, bool excludeCurrentContext)
    {
        var request = new PushSendRequestModel
        {
            OrganizationId = orgId.ToString(),
            Type = type,
            Payload = payload
        };

        await AddCurrentContextAsync(request, excludeCurrentContext);
        await SendAsync(HttpMethod.Post, "push/send", request);
    }

    private async Task AddCurrentContextAsync(PushSendRequestModel request, bool addIdentifier)
    {
        var currentContext = _httpContextAccessor?.HttpContext?.
            RequestServices.GetService(typeof(ICurrentContext)) as ICurrentContext;
        if (!string.IsNullOrWhiteSpace(currentContext?.DeviceIdentifier))
        {
            var device = await _deviceRepository.GetByIdentifierAsync(currentContext.DeviceIdentifier);
            if (device != null)
            {
                request.DeviceId = device.Id.ToString();
            }
            if (addIdentifier)
            {
                request.Identifier = currentContext.DeviceIdentifier;
            }
        }
    }

    public Task SendPayloadToUserAsync(string userId, PushType type, object payload, string identifier,
        string deviceId = null)
    {
        throw new NotImplementedException();
    }

    public Task SendPayloadToOrganizationAsync(string orgId, PushType type, object payload, string identifier,
        string deviceId = null)
    {
        throw new NotImplementedException();
    }
}