package admin

import (
	"context"
	"errors"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"

	"github.com/yuxingu/digital-psychology/apps/api/internal/repository"
)

// AskSessionDetail is AskSessionView plus messages.
type AskSessionDetail struct {
	repository.AskSessionView
	Messages []repository.AskMessageView `json:"messages"`
}

var ErrAskThreadNotFound = errString("ask thread not found")

// ListAskSessions lists AskSessionView rows.
func (s *Service) ListAskSessions(ctx context.Context, userID *uuid.UUID, limit, offset int) ([]repository.AskSessionView, error) {
	items, err := s.Repo.ListAskSessions(ctx, userID, limit, offset)
	if err != nil {
		return nil, err
	}
	if items == nil {
		items = []repository.AskSessionView{}
	}
	return items, nil
}

// GetAskSessionDetail loads meta + messages.
func (s *Service) GetAskSessionDetail(ctx context.Context, threadID uuid.UUID) (*AskSessionDetail, error) {
	view, err := s.Repo.GetAskSession(ctx, threadID)
	if errors.Is(err, pgx.ErrNoRows) {
		return nil, ErrAskThreadNotFound
	}
	if err != nil {
		return nil, err
	}
	msgs, err := s.Repo.ListAskMessagesForAdmin(ctx, threadID)
	if err != nil {
		return nil, err
	}
	if msgs == nil {
		msgs = []repository.AskMessageView{}
	}
	return &AskSessionDetail{AskSessionView: *view, Messages: msgs}, nil
}