package logic

import (
	"context"

	"spark-server/internal/pkg/errs"
)

func (s *Service) ListMembers(ctx context.Context, userID, groupID int64, limit int) (*MemberList, error) {
	if !s.ready() || userID <= 0 {
		return nil, errs.ErrUnauthorized
	}
	if _, err := s.loadActive(ctx, groupID); err != nil {
		return nil, err
	}
	if _, err := s.requireMember(ctx, groupID, userID); err != nil {
		return nil, err
	}
	rows, err := s.repo.ListMembers(ctx, groupID, limit)
	if err != nil {
		return nil, err
	}
	items := make([]*MemberView, 0, len(rows))
	for _, mem := range rows {
		u, err := s.users.Get(ctx, mem.UserID)
		if err != nil {
			items = append(items, memberViewOf(mem, nil))
			continue
		}
		items = append(items, memberViewOf(mem, u))
	}
	return &MemberList{Items: items}, nil
}

func (s *Service) MemberIDs(ctx context.Context, conversationID int64) ([]int64, error) {
	if !s.ready() || conversationID <= 0 {
		return nil, errs.ErrInvalidArgument
	}
	if ids, ok := s.cachedMemberIDs(conversationID); ok {
		return ids, nil
	}
	g, err := s.repo.GetByConversation(ctx, conversationID)
	if err != nil {
		return nil, err
	}
	if !g.Active() {
		return []int64{}, nil
	}
	ids, err := s.repo.ListMemberIDs(ctx, g.ID)
	if err != nil {
		return nil, err
	}
	s.putMemberIDs(conversationID, ids)
	return ids, nil
}

func (s *Service) IDByConversation(ctx context.Context, conversationID int64) (int64, error) {
	if !s.ready() || conversationID <= 0 {
		return 0, errs.ErrInvalidArgument
	}
	g, err := s.repo.GetByConversation(ctx, conversationID)
	if err != nil {
		return 0, err
	}
	return g.ID, nil
}

func (s *Service) CanSend(ctx context.Context, userID, conversationID int64) error {
	if !s.ready() || userID <= 0 || conversationID <= 0 {
		return errs.ErrForbidden
	}
	g, err := s.repo.GetByConversation(ctx, conversationID)
	if err != nil || !g.Active() {
		return errs.ErrForbidden
	}
	mem, err := s.repo.GetMember(ctx, g.ID, userID)
	if err != nil {
		return errs.ErrForbidden
	}
	if !mem.CanSpeak(g.MutedAll) {
		return errs.ErrForbidden
	}
	return nil
}