using Application.Abstractions.Data;
using Application.Abstractions.Messaging;
using Microsoft.EntityFrameworkCore;
using SharedKernel.Results;

namespace Application.Features.Api.MyPage.Sns.List;

internal sealed class Handler(IAppDbContext db) : IQueryHandler<Query, Result<Response>>
{
    // 지원 예정 provider — 카드 UI 에 'disabled' 로 노출하기 위해 항상 응답에 포함
    private static readonly string[] SupportedProviders = ["Google", "Naver", "Kakao"];

    public async Task<Result<Response>> Handle(Query request, CancellationToken ct)
    {
        var tokens = await db.MemberOAuthToken
            .AsNoTracking()
            .Where(t => t.MemberID == request.MemberID)
            .Select(t => new
            {
                t.Provider,
                t.CreatedAt,
                t.UpdatedAt,
                t.ExpiresAt
            })
            .ToListAsync(ct);

        var now = DateTime.UtcNow;
        var items = SupportedProviders.Select(provider => {
            var token = tokens.FirstOrDefault(t => t.Provider == provider);

            if (token is null)
            {
                return new SnsLinkItem(provider, false, null, null, null, false);
            }

            return new SnsLinkItem(
                provider,
                true,
                token.CreatedAt,
                token.UpdatedAt,
                token.ExpiresAt,
                now >= token.ExpiresAt
            );
        }).ToList();

        return Result.Success(new Response(items));
    }
}