using Application.Abstractions.Cache;
using Application.Abstractions.Data;
using Application.Abstractions.Messaging;
using Application.Helpers;
using Domain.Entities.Members.Logs;
using Domain.Entities.Store.ValueObject;
using Microsoft.EntityFrameworkCore;
using SharedKernel.Results;
using SharedKernel.Storage;

namespace Application.Features.Api.MyPage.ChangeThumb;

internal sealed class Handler(
    IAppDbContext db,
    IFileStorage fileStorage,
    ICacheService cache
) : ICommandHandler<Command, Result<string?>>
{
    public async Task<Result<string?>> Handle(Command request, CancellationToken ct)
    {
        var member = await db.Member.FirstOrDefaultAsync(m => m.ID == request.MemberID, ct);
        if (member is null)
        {
            return Result.Failure<string?>(Error.NotFound("MyPage.MemberNotFound", "회원 정보를 찾을 수 없습니다."));
        }

        // 프로필 이미지 변경 주기 확인 (프로필 이미지 변경권으로 즉시 우회)
        var now = DateTime.UtcNow;
        var accountConfig = await AccountConfigLoader.GetAccountConfigAsync(cache, db, ct);
        if (accountConfig.ChangeThumbDay is > 0 && member.LastThumbChangedAt.HasValue)
        {
            var nextChangeDate = member.LastThumbChangedAt.Value.AddDays(accountConfig.ChangeThumbDay.Value);
            if (now < nextChangeDate)
            {
                if (!await MemberItemConsumer.TryConsumeAsync(db, request.MemberID, ItemKind.ProfileImageChange, now, "프로필 이미지 변경권 사용", ct))
                {
                    return Result.Failure<string?>(Error.Problem("MyPage.ThumbChangeTooSoon",
                        $"프로필 이미지는 {accountConfig.ChangeThumbDay}일마다 변경 가능합니다. (변경권으로 즉시 변경 가능)"));
                }
            }
        }

        var beforeThumb = member.Thumb;

        // 기존 사진 삭제
        if (!string.IsNullOrEmpty(member.Thumb))
        {
            fileStorage.DeleteByUrl(member.Thumb);
        }

        string? thumbUrl = null;

        if (request.Thumb is not null && request.Thumb.Length > 0)
        {
            FileStoragePath uploadPath = new(UploadTarget.Upload, UploadFolder.MemberThumb, request.MemberID);
            string[] allowedExtensions = [".jpg", ".jpeg", ".png", ".gif", ".webp"];

            var result = await fileStorage.SaveFileAsync(request.Thumb, uploadPath, allowedExtensions, ct);
            thumbUrl = result?.Url;
        }

        member.SetThumb(thumbUrl);
        db.MemberThumbChangeLog.Add(MemberThumbChangeLog.Create(request.MemberID, beforeThumb, thumbUrl));

        await db.SaveChangesAsync(ct);

        return Result.Success<string?>(thumbUrl);
    }
}