package logic

import (
	"context"
	"time"

	"spark-server/internal/module/friend/entity"
	"spark-server/internal/pkg/errs"
	"spark-server/internal/pkg/i18n"
	"spark-server/internal/pkg/reqctx"
	"spark-server/internal/pkg/validate"
)

// RejectInput ignores/rejects a pending incoming friend request.
type RejectInput struct {
	RequestID int64 `json:"request_id" validate:"required,gt=0" label:"field.request_id" errmsg:"required:validate.friend.request_required"`
}

// Reject marks a pending request as rejected (status=3). Idempotent if already rejected.
func (s *Service) Reject(ctx context.Context, userID int64, in RejectInput) error {
	if !s.ready() || userID <= 0 {
		return errs.ErrUnauthorized
	}
	if err := validate.StructLang(reqctx.Lang(ctx), in); err != nil {
		return err
	}
	req, err := s.repo.GetRequest(ctx, in.RequestID)
	if err != nil {
		return err
	}
	lang := reqctx.Lang(ctx)
	if req.ToUser != userID {
		return errs.ErrForbidden.WithMsg(i18n.T(lang, i18n.KeyFriendRequestInvalid, nil))
	}
	if req.Status == entity.RequestRejected {
		return nil
	}
	if req.Status != entity.RequestPending {
		return errs.ErrForbidden.WithMsg(i18n.T(lang, i18n.KeyFriendRequestInvalid, nil))
	}
	req.Status = entity.RequestRejected
	req.UpdatedAt = time.Now()
	return s.repo.UpsertRequest(ctx, req)
}