/**
 * Database schema migrations.
 * Creates tables idempotently.
 */

import type { Kysely } from 'kysely';
import type { Database } from './database.js';

export async function migrate(db: Kysely<Database>): Promise<void> {
  // Create feed_items table
  await db.schema
    .createTable('feed_items')
    .ifNotExists()
    .addColumn('id', 'varchar(64)', (col) => col.primaryKey())
    .addColumn('source', 'varchar(2048)', (col) => col.notNull())
    .addColumn('title', 'varchar(512)', (col) => col.notNull())
    .addColumn('url', 'varchar(2048)', (col) => col.notNull())
    .addColumn('published_at', 'varchar(32)', (col) => col.notNull())
    .addColumn('content', 'text')
    .addColumn('summary', 'text')
    .addColumn('created_at', 'varchar(32)', (col) => col.notNull().defaultTo('CURRENT_TIMESTAMP'))
    .execute();

  // Create indexes for feed_items
  await db.schema
    .createIndex('idx_feed_items_source')
    .ifNotExists()
    .on('feed_items')
    .column('source')
    .execute();

  await db.schema
    .createIndex('idx_feed_items_published')
    .ifNotExists()
    .on('feed_items')
    .column('published_at')
    .execute();

  // Create seen_ids table
  await db.schema
    .createTable('seen_ids')
    .ifNotExists()
    .addColumn('id', 'varchar(64)', (col) => col.primaryKey())
    .addColumn('seen_at', 'varchar(32)', (col) => col.notNull().defaultTo('CURRENT_TIMESTAMP'))
    .execute();

  // Create feed_sources table
  await db.schema
    .createTable('feed_sources')
    .ifNotExists()
    .addColumn('id', 'varchar(64)', (col) => col.primaryKey())
    .addColumn('url', 'varchar(2048)', (col) => col.notNull().unique())
    .addColumn('name', 'varchar(256)')
    .addColumn('format', 'varchar(10)', (col) => col.notNull())
    .addColumn('poll_interval_ms', 'integer', (col) => col.notNull())
    .addColumn('is_active', 'boolean', (col) => col.notNull().defaultTo(true))
    .addColumn('last_fetched_at', 'varchar(32)')
    .addColumn('last_success_at', 'varchar(32)')
    .addColumn('consecutive_failures', 'integer', (col) => col.notNull().defaultTo(0))
    .addColumn('created_at', 'varchar(32)', (col) => col.notNull().defaultTo('CURRENT_TIMESTAMP'))
    .addColumn('updated_at', 'varchar(32)', (col) => col.notNull().defaultTo('CURRENT_TIMESTAMP'))
    .execute();

  // Create index on is_active for quick filtering
  await db.schema
    .createIndex('idx_feed_sources_active')
    .ifNotExists()
    .on('feed_sources')
    .column('is_active')
    .execute();
}

export async function reset(db: Kysely<Database>): Promise<void> {
  // Drop tables (for testing)
  await db.schema.dropIndex('idx_feed_sources_active').ifExists().execute();
  await db.schema.dropTable('feed_sources').ifExists().execute();
  await db.schema.dropTable('seen_ids').ifExists().execute();
  await db.schema.dropIndex('idx_feed_items_published').ifExists().execute();
  await db.schema.dropIndex('idx_feed_items_source').ifExists().execute();
  await db.schema.dropTable('feed_items').ifExists().execute();
}