import type { Kysely } from 'kysely';
import { sql } from 'kysely';
import type { DatabaseTables } from '../tables.ts';

/**
 * Helper for converting the current time to a millisecond timestamp.
 *
 * @returns SQLite expression producing the current time in milliseconds.
 */
const millisecondTime = sql`(CAST(unixepoch('subsec') * 1000 AS INTEGER))`;

/**
 * Creates the resource_data table.
 *
 * @param db - Kysely database to apply the migration against.
 */
export const up = async (db: Kysely<DatabaseTables>): Promise<void> => {
    // Composite primary key enforces one blob slot per (resource, public key).
    await db.schema
        .createTable('resource_data')
        .ifNotExists()
        .addColumn('resource_id', 'text', (col) => col.notNull())
        .addColumn('public_key', 'text', (col) => col.notNull())
        .addColumn('blob', 'blob', (col) => col.notNull())
        .addColumn('timestamp', 'integer', (col) => col.notNull().defaultTo(millisecondTime))
        .addPrimaryKeyConstraint('pk_resource_data', ['resource_id', 'public_key'])
        .execute();
};

/**
 * Drops the resource_data table.
 *
 * @param db - Kysely database to apply the rollback against.
 */
export const down = async (db: Kysely<DatabaseTables>): Promise<void> => {
    await db.schema.dropTable('resource_data').ifExists().execute();
};