package services

import (
	"context"
	"fmt"

	"github.com/jmoiron/sqlx"
)

// LinkService persists user-submitted Link Hub suggestions and feedback into
// paliad.link_suggestions / paliad.link_feedback. The earlier implementation
// posted these via Supabase PostgREST against a public-schema patholo_link_*
// table; that surface no longer exists after the rebrand to paliad schema, so
// writes go through the same sqlx pool every other paliad service uses.
type LinkService struct {
	db *sqlx.DB
}

func NewLinkService(db *sqlx.DB) *LinkService {
	return &LinkService{db: db}
}

// LinkSuggestionInput is the payload of a /api/links/suggest call.
// Description and SuggestedBy are optional — empty strings hit the column
// defaults set in the migration.
type LinkSuggestionInput struct {
	Title       string
	URL         string
	Category    string
	Description string
	SuggestedBy string
}

// InsertSuggestion creates a row with status='pending' so admins can triage
// before promoting the link into the curated hub.
func (s *LinkService) InsertSuggestion(ctx context.Context, in LinkSuggestionInput) error {
	const q = `INSERT INTO paliad.link_suggestions
		(title, url, category, description, suggested_by, status)
		VALUES ($1, $2, $3, $4, $5, 'pending')`
	if _, err := s.db.ExecContext(ctx, q,
		in.Title, in.URL, in.Category, in.Description, in.SuggestedBy,
	); err != nil {
		return fmt.Errorf("insert link suggestion: %w", err)
	}
	return nil
}

// LinkFeedbackInput is the payload of a /api/links/feedback call.
type LinkFeedbackInput struct {
	LinkID       string
	FeedbackType string
	Message      string
	SubmittedBy  string
}

func (s *LinkService) InsertFeedback(ctx context.Context, in LinkFeedbackInput) error {
	const q = `INSERT INTO paliad.link_feedback
		(link_id, feedback_type, message, submitted_by)
		VALUES ($1, $2, $3, $4)`
	if _, err := s.db.ExecContext(ctx, q,
		in.LinkID, in.FeedbackType, in.Message, in.SubmittedBy,
	); err != nil {
		return fmt.Errorf("insert link feedback: %w", err)
	}
	return nil
}

// CountPendingSuggestions powers the admin badge on the Link Hub.
func (s *LinkService) CountPendingSuggestions(ctx context.Context) (int, error) {
	var n int
	if err := s.db.GetContext(ctx, &n,
		`SELECT count(*) FROM paliad.link_suggestions WHERE status = 'pending'`,
	); err != nil {
		return 0, fmt.Errorf("count pending link suggestions: %w", err)
	}
	return n, nil
}