package admin

import (
	"context"
	"encoding/json"
	"errors"

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

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

var (
	ErrInvalidScaleStatus = errors.New("invalid scale status")
	ErrScaleNotFound      = errors.New("scale not found")
)

// ListHomeTools returns all grid tools.
func (s *Service) ListHomeTools(ctx context.Context) ([]repository.HomeTool, error) {
	if s.Home == nil {
		return nil, errors.New("home unavailable")
	}
	return s.Home.ListAdmin(ctx)
}

// ReplaceHomeTools replaces grid and audits in one transaction.
func (s *Service) ReplaceHomeTools(ctx context.Context, adminID uuid.UUID, items []homesvc.ReplaceInput) error {
	if s.Home == nil {
		return errors.New("home unavailable")
	}
	meta, _ := json.Marshal(map[string]any{"count": len(items)})
	return s.Home.ReplaceWithAudit(ctx, adminID, items, meta)
}

// ListScalesAdmin returns all scales.
func (s *Service) ListScalesAdmin(ctx context.Context) ([]repository.ScaleAdminItem, error) {
	if s.Scales == nil {
		return nil, errors.New("scales unavailable")
	}
	return s.Scales.ListAllAdmin(ctx)
}

// PatchScaleStatus updates published|draft and audits in one transaction.
func (s *Service) PatchScaleStatus(ctx context.Context, adminID, scaleID uuid.UUID, status string) error {
	if status != "published" && status != "draft" {
		return ErrInvalidScaleStatus
	}
	if s.Scales == nil {
		return errors.New("scales unavailable")
	}
	meta, _ := json.Marshal(map[string]any{"status": status})
	if err := s.Scales.UpdateStatusWithAudit(ctx, scaleID, status, adminID, meta); err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return ErrScaleNotFound
		}
		return err
	}
	return nil
}