import { connect } from '@tursodatabase/database';
import { access, mkdir, readFile } from 'node:fs/promises';
import { dirname, resolve } from 'node:path';
import process from 'node:process';
import { initializeDefaultUsers } from './default-users.mjs';

const databasePath = resolve(process.env.TDR_DATABASE_PATH || './data/shd-build.db');
const schemaPath = resolve('./database/schema.sql');
let databaseAlreadyExisted = true;
try {
	await access(databasePath);
} catch {
	databaseAlreadyExisted = false;
}

await mkdir(dirname(databasePath), { recursive: true });

const database = await connect(databasePath);
const schema = await readFile(schemaPath, 'utf8');

const usersTable = await (await database.prepare(
	"SELECT 1 FROM sqlite_master WHERE type='table' AND name='users'"
)).get();
if (usersTable) {
	const userColumns = await (await database.prepare("PRAGMA table_info('users')")).all();
	if (!userColumns.some((column) => column.name === 'login_username')) {
		console.log('Separating optional local login usernames from internal account identifiers.');
		await database.exec('ALTER TABLE users ADD COLUMN login_username TEXT');
		await database.exec('UPDATE users SET login_username=username WHERE password_hash IS NOT NULL');
	}
}

// The project schema deliberately avoids semicolons inside string literals.
const statements = schema
	.split(';')
	.map((statement) => statement.trim())
	.filter(Boolean);

for (const statement of statements) {
	await database.exec(statement);
}

const loginEventsDefinition = await (await database.prepare(
	"SELECT sql FROM sqlite_master WHERE type='table' AND name='login_events'"
)).get();
if (typeof loginEventsDefinition?.sql === 'string' && !loginEventsDefinition.sql.includes('magic_link')) {
	console.log('Expanding login event providers for passwordless authentication.');
	await database.exec('ALTER TABLE login_events RENAME TO login_events_legacy');
	await database.exec(`CREATE TABLE login_events (
		id TEXT PRIMARY KEY,
		user_id TEXT REFERENCES users(id) ON DELETE SET NULL,
		provider TEXT NOT NULL CHECK(provider IN ('password', 'discord', 'magic_link', 'passkey')),
		succeeded INTEGER NOT NULL CHECK(succeeded IN (0, 1)),
		created_at TEXT NOT NULL
	)`);
	await database.exec(`INSERT INTO login_events(id,user_id,provider,succeeded,created_at)
		SELECT id,user_id,provider,succeeded,created_at FROM login_events_legacy`);
	await database.exec('DROP TABLE login_events_legacy');
	await database.exec('CREATE INDEX IF NOT EXISTS login_events_user_created_idx ON login_events(user_id, created_at DESC)');
}

console.log(`Applied ${statements.length} schema statements to ${databasePath}`);

if (!databaseAlreadyExisted) {
	console.log('New database detected; creating default users.');
	await initializeDefaultUsers(database);
}