// Package settings provides access to the application's key/value settings.
package settings

import (
	"context"
	"database/sql"
	"errors"
)

type Store struct{ db *sql.DB }

func NewStore(db *sql.DB) *Store { return &Store{db: db} }

func (s *Store) Get(ctx context.Context, key, fallback string) (string, error) {
	var v string
	err := s.db.QueryRowContext(ctx, `SELECT value FROM settings WHERE key = ?`, key).Scan(&v)
	if errors.Is(err, sql.ErrNoRows) {
		return fallback, nil
	}
	if err != nil {
		return "", err
	}
	return v, nil
}

func (s *Store) Set(ctx context.Context, key, value string) error {
	_, err := s.db.ExecContext(ctx,
		`INSERT INTO settings (key, value, updated_at) VALUES (?, ?, strftime('%Y-%m-%dT%H:%M:%fZ','now'))
		 ON CONFLICT(key) DO UPDATE SET value = excluded.value, updated_at = excluded.updated_at`,
		key, value)
	return err
}

func (s *Store) All(ctx context.Context) (map[string]string, error) {
	rows, err := s.db.QueryContext(ctx, `SELECT key, value FROM settings`)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	out := map[string]string{}
	for rows.Next() {
		var k, v string
		if err := rows.Scan(&k, &v); err != nil {
			return nil, err
		}
		out[k] = v
	}
	return out, rows.Err()
}