package store

import (
	"context"
	"fmt"
)

// ConfigValues returns every application-configuration override row as
// key -> value. An absent key means its default (from internal/config's
// app-key registry) is in effect -- the table stores overrides only.
func (db *DB) ConfigValues(ctx context.Context) (map[string]string, error) {
	rows, err := db.QueryContext(ctx, `SELECT key, value FROM config`)
	if err != nil {
		return nil, fmt.Errorf("config values: %w", err)
	}
	defer rows.Close()

	values := map[string]string{}
	for rows.Next() {
		var k, v string
		if err := rows.Scan(&k, &v); err != nil {
			return nil, fmt.Errorf("scan config row: %w", err)
		}
		values[k] = v
	}
	return values, rows.Err()
}

// SetConfigValue upserts one override row. Key validation is the caller's
// job (config.ValidateAppValue) -- the store stays a dumb K/V layer.
func (db *DB) SetConfigValue(ctx context.Context, key, value string) error {
	if _, err := db.ExecContext(ctx, `
		INSERT INTO config (key, value, updated_at) VALUES (?, ?, datetime('now'))
		ON CONFLICT(key) DO UPDATE SET value = excluded.value, updated_at = excluded.updated_at`,
		key, value); err != nil {
		return fmt.Errorf("set config %q: %w", key, err)
	}
	return nil
}