using System.ComponentModel.DataAnnotations;
using System.Text.Json;
using Bit.Core.Auth.Enums;
using Bit.Core.Auth.Models;
using Bit.Core.Enums;
using Bit.Core.Tools.Entities;
using Bit.Core.Utilities;
using Microsoft.AspNetCore.Identity;

#nullable enable

namespace Bit.Core.Entities;

public class User : ITableObject<Guid>, IStorableSubscriber, IRevisable, ITwoFactorProvidersUser, IReferenceable
{
    private Dictionary<TwoFactorProviderType, TwoFactorProvider>? _twoFactorProviders;

    public Guid Id { get; set; }
    [MaxLength(50)]
    public string? Name { get; set; }
    [Required]
    [MaxLength(256)]
    public string Email { get; set; } = null!;
    public bool EmailVerified { get; set; }
    [MaxLength(300)]
    public string? MasterPassword { get; set; }
    [MaxLength(50)]
    public string? MasterPasswordHint { get; set; }
    [MaxLength(10)]
    public string Culture { get; set; } = "en-US";
    [Required]
    [MaxLength(50)]
    public string SecurityStamp { get; set; } = null!;
    public string? TwoFactorProviders { get; set; }
    [MaxLength(32)]
    public string? TwoFactorRecoveryCode { get; set; }
    public string? EquivalentDomains { get; set; }
    public string? ExcludedGlobalEquivalentDomains { get; set; }
    public DateTime AccountRevisionDate { get; set; } = DateTime.UtcNow;
    public string? Key { get; set; }
    public string? PublicKey { get; set; }
    public string? PrivateKey { get; set; }
    public bool Premium { get; set; }
    public DateTime? PremiumExpirationDate { get; set; }
    public DateTime? RenewalReminderDate { get; set; }
    public long? Storage { get; set; }
    public short? MaxStorageGb { get; set; }
    public GatewayType? Gateway { get; set; }
    [MaxLength(50)]
    public string? GatewayCustomerId { get; set; }
    [MaxLength(50)]
    public string? GatewaySubscriptionId { get; set; }
    public string? ReferenceData { get; set; }
    [MaxLength(100)]
    public string? LicenseKey { get; set; }
    [Required]
    [MaxLength(30)]
    public string ApiKey { get; set; } = null!;
    public KdfType Kdf { get; set; } = KdfType.PBKDF2_SHA256;
    public int KdfIterations { get; set; } = AuthConstants.PBKDF2_ITERATIONS.Default;
    public int? KdfMemory { get; set; }
    public int? KdfParallelism { get; set; }
    public DateTime CreationDate { get; set; } = DateTime.UtcNow;
    public DateTime RevisionDate { get; set; } = DateTime.UtcNow;
    public bool ForcePasswordReset { get; set; }
    public bool UsesKeyConnector { get; set; }
    public int FailedLoginCount { get; set; }
    public DateTime? LastFailedLoginDate { get; set; }
    [MaxLength(7)]
    public string? AvatarColor { get; set; }
    public DateTime? LastPasswordChangeDate { get; set; }
    public DateTime? LastKdfChangeDate { get; set; }
    public DateTime? LastKeyRotationDate { get; set; }
    public DateTime? LastEmailChangeDate { get; set; }

    public void SetNewId()
    {
        Id = CoreHelpers.GenerateComb();
    }

    public string? BillingEmailAddress()
    {
        return Email?.ToLowerInvariant()?.Trim();
    }

    public string? BillingName()
    {
        return Name;
    }

    public string SubscriberName()
    {
        return string.IsNullOrWhiteSpace(Name) ? Email : Name;
    }

    public string BraintreeCustomerIdPrefix()
    {
        return "u";
    }

    public string BraintreeIdField()
    {
        return "user_id";
    }

    public string BraintreeCloudRegionField()
    {
        return "region";
    }

    public string GatewayIdField()
    {
        return "userId";
    }

    public bool IsOrganization() => false;

    public bool IsUser()
    {
        return true;
    }

    public string SubscriberType()
    {
        return "Subscriber";
    }

    public bool IsExpired() => PremiumExpirationDate.HasValue && PremiumExpirationDate.Value <= DateTime.UtcNow;

    public Dictionary<TwoFactorProviderType, TwoFactorProvider>? GetTwoFactorProviders()
    {
        if (string.IsNullOrWhiteSpace(TwoFactorProviders))
        {
            return null;
        }

        try
        {
            if (_twoFactorProviders == null)
            {
                _twoFactorProviders =
                    JsonHelpers.LegacyDeserialize<Dictionary<TwoFactorProviderType, TwoFactorProvider>>(
                        TwoFactorProviders);
            }

            // U2F is no longer supported, and all users keys should have been migrated to WebAuthn.
            // To prevent issues with accounts being prompted for unsupported U2F we remove them
            if (_twoFactorProviders.ContainsKey(TwoFactorProviderType.U2f))
            {
                _twoFactorProviders.Remove(TwoFactorProviderType.U2f);
            }

            return _twoFactorProviders;
        }
        catch (JsonException)
        {
            return null;
        }
    }

    public Guid? GetUserId()
    {
        return Id;
    }

    public bool GetPremium()
    {
        return Premium;
    }

    public void SetTwoFactorProviders(Dictionary<TwoFactorProviderType, TwoFactorProvider> providers)
    {
        // When replacing with system.text remember to remove the extra serialization in WebAuthnTokenProvider.
        TwoFactorProviders = JsonHelpers.LegacySerialize(providers, JsonHelpers.LegacyEnumKeyResolver);
        _twoFactorProviders = providers;
    }

    public void ClearTwoFactorProviders()
    {
        SetTwoFactorProviders(new Dictionary<TwoFactorProviderType, TwoFactorProvider>());
    }

    public TwoFactorProvider? GetTwoFactorProvider(TwoFactorProviderType provider)
    {
        var providers = GetTwoFactorProviders();
        if (providers == null || !providers.ContainsKey(provider))
        {
            return null;
        }

        return providers[provider];
    }

    public long StorageBytesRemaining()
    {
        if (!MaxStorageGb.HasValue)
        {
            return 0;
        }

        return StorageBytesRemaining(MaxStorageGb.Value);
    }

    public long StorageBytesRemaining(short maxStorageGb)
    {
        var maxStorageBytes = maxStorageGb * 1073741824L;
        if (!Storage.HasValue)
        {
            return maxStorageBytes;
        }

        return maxStorageBytes - Storage.Value;
    }

    public IdentityUser ToIdentityUser(bool twoFactorEnabled)
    {
        return new IdentityUser
        {
            Id = Id.ToString(),
            Email = Email,
            NormalizedEmail = Email,
            EmailConfirmed = EmailVerified,
            UserName = Email,
            NormalizedUserName = Email,
            TwoFactorEnabled = twoFactorEnabled,
            SecurityStamp = SecurityStamp
        };
    }

    public bool HasMasterPassword()
    {
        return MasterPassword != null;
    }
}