import fs from 'fs'
import path from 'path'

const inputPath = process.argv[2]
const outputPath = process.argv[3]

if (!inputPath || !outputPath) {
  console.error('Usage: node generate-drop.js <input.sql> <output.sql>')
  process.exit(1)
}

const input = fs.readFileSync(path.resolve(inputPath), 'utf8')

const tableRegex = /CREATE TABLE IF NOT EXISTS "([^"]+)"/g
const tables = []
let match
while ((match = tableRegex.exec(input)) !== null) {
  tables.push(match[1])
}

const uniqueTables = Array.from(new Set(tables))

const drops = [
  'PRAGMA foreign_keys=OFF;',
  'BEGIN TRANSACTION;'
]

// Drop in reverse order of creation
for (const table of uniqueTables.reverse()) {
  drops.push(`DROP TABLE IF EXISTS "${table}";`)
}

drops.push('COMMIT;')

fs.writeFileSync(path.resolve(outputPath), drops.join('\n') + '\n', 'utf8')

console.log(`Wrote ${outputPath} with ${uniqueTables.length} DROP statements`)