package logic

import (
	"context"
	"errors"

	"spark-server/internal/module/friend/entity"
	"spark-server/internal/pkg/errs"
)

// LookupInput finds a user to add. Exactly one identifier.
type LookupInput struct {
	UID     int64
	Email   string
	SparkID string
	QRCode  string
}

func (s *Service) Lookup(ctx context.Context, userID int64, in LookupInput) (*FriendView, error) {
	if !s.ready() || userID <= 0 {
		return nil, errs.ErrUnauthorized
	}
	target, _, err := s.resolveTarget(ctx, &ApplyInput{
		UID: in.UID, Email: in.Email, SparkID: in.SparkID, QRCode: in.QRCode,
	})
	if err != nil {
		return nil, err
	}
	blockedBy, err := s.repo.IsBlocked(ctx, target.ID, userID)
	if err != nil {
		return nil, err
	}
	if blockedBy {
		return nil, errs.ErrNotFound
	}
	rel, err := s.repo.GetRelation(ctx, userID, target.ID)
	if err != nil && !errors.Is(err, errs.ErrNotFound) {
		return nil, err
	}
	if errors.Is(err, errs.ErrNotFound) {
		rel = nil
	}
	friend, err := s.AreFriends(ctx, userID, target.ID)
	if err != nil {
		return nil, err
	}
	blockedMe := rel != nil && rel.Blocked
	view := viewOf(target, rel)
	view.Relation = entity.ViewRelation(friend, blockedMe)
	if !friend {
		view.CreatedAt = 0
		view.Pinned = false
		if rel == nil {
			view.Remark = ""
		}
	}
	return view, nil
}