using DysonNetwork.Sphere.Account.Proto;
using Grpc.Core;
using Google.Protobuf.WellKnownTypes;
using Microsoft.EntityFrameworkCore;
using DysonNetwork.Sphere.Auth;

namespace DysonNetwork.Sphere.Account;

public class AccountGrpcService : DysonNetwork.Sphere.Account.Proto.AccountService.AccountServiceBase
{
    private readonly AppDatabase _db;
    private readonly AuthService _auth;

    public AccountGrpcService(AppDatabase db, AuthService auth)
    {
        _db = db;
        _auth = auth;
    }

    public override async Task<AccountResponse> GetAccount(Empty request, ServerCallContext context)
    {
        var account = await GetAccountFromContext(context);
        return ToAccountResponse(account);
    }

    public override async Task<AccountResponse> UpdateAccount(UpdateAccountRequest request, ServerCallContext context)
    {
        var account = await GetAccountFromContext(context);

        if (request.Email != null)
        {
            var emailContact = await _db.AccountContacts.FirstOrDefaultAsync(c => c.AccountId == account.Id && c.Type == AccountContactType.Email);
            if (emailContact != null)
            {
                emailContact.Content = request.Email;
            }
            else
            {
                account.Contacts.Add(new AccountContact { Type = AccountContactType.Email, Content = request.Email });
            }
        }

        if (request.DisplayName != null)
        {
            account.Nick = request.DisplayName;
        }

        await _db.SaveChangesAsync();

        return ToAccountResponse(account);
    }

    private async Task<DysonNetwork.Sphere.Account.Account> GetAccountFromContext(ServerCallContext context)
    {
        var authorizationHeader = context.RequestHeaders.FirstOrDefault(h => h.Key == "authorization");
        if (authorizationHeader == null)
        {
            throw new RpcException(new Grpc.Core.Status(StatusCode.Unauthenticated, "Missing authorization header."));
        }

        var token = authorizationHeader.Value.Replace("Bearer ", "");
        if (!_auth.ValidateToken(token, out var sessionId))
        {
            throw new RpcException(new Grpc.Core.Status(StatusCode.Unauthenticated, "Invalid token."));
        }

        var session = await _db.AuthSessions.Include(s => s.Account).ThenInclude(a => a.Contacts).FirstOrDefaultAsync(s => s.Id == sessionId);
        if (session == null)
        {
            throw new RpcException(new Grpc.Core.Status(StatusCode.Unauthenticated, "Session not found."));
        }

        return session.Account;
    }

    private AccountResponse ToAccountResponse(DysonNetwork.Sphere.Account.Account account)
    {
        var emailContact = account.Contacts.FirstOrDefault(c => c.Type == AccountContactType.Email);
        return new AccountResponse
        {
            Id = account.Id.ToString(),
            Username = account.Name,
            Email = emailContact?.Content ?? "",
            DisplayName = account.Nick
        };
    }
}