#!/usr/bin/env node
/**
 * Compares runtime Express method registrations against OpenAPI path keys.
 * Fails if coverage drops below OPENAPI_MIN_COVERAGE (default 55) or if
 * required ops endpoints are missing from the OpenAPI document.
 */
import fs from 'node:fs'
import path from 'node:path'

const root = path.resolve(process.cwd())
const apiSrc = path.join(root, 'apps', 'api', 'src')
const minCoverage = Number(process.env.OPENAPI_MIN_COVERAGE ?? 55)

function walk(dir, out = []) {
  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
    const p = path.join(dir, entry.name)
    if (entry.isDirectory()) {
      if (entry.name === 'node_modules' || entry.name === 'dist') continue
      walk(p, out)
    } else if (/\.(ts|js)$/.test(entry.name) && !/\.test\./.test(entry.name)) {
      out.push(p)
    }
  }
  return out
}

const routeCall = /\b(router|app)\.(get|post|put|patch|delete)\(\s*['"`]([^'"`]+)['"`]/gi
const files = walk(apiSrc)
const runtime = new Set()

for (const file of files) {
  const text = fs.readFileSync(file, 'utf8')
  let match
  while ((match = routeCall.exec(text))) {
    const method = match[2].toUpperCase()
    let routePath = match[3]
    if (!routePath.startsWith('/')) routePath = `/${routePath}`
    runtime.add(`${method} ${routePath}`)
  }
}

const openapiPath = path.join(apiSrc, 'swagger', 'openapi.ts')
const openapiText = fs.readFileSync(openapiPath, 'utf8')
const pathKeys = [...openapiText.matchAll(/^\s*'(\/[^']+)':\s*\{/gm)].map((m) => m[1])
const openapiPaths = new Set(pathKeys)

const required = ['/health', '/ready', '/metrics']
const missingRequired = required.filter((p) => !openapiPaths.has(p))

// Rough coverage: unique OpenAPI path keys vs unique runtime path strings
const runtimePaths = new Set([...runtime].map((entry) => entry.split(' ').slice(1).join(' ')))
const covered = [...openapiPaths].filter((p) => {
  if (runtimePaths.has(p)) return true
  // parameterised OpenAPI paths often match runtime `/:id` style
  return [...runtimePaths].some((rp) => rp.split('/').length === p.split('/').length)
})
const coverage = openapiPaths.size === 0 ? 0 : Math.round((covered.length / Math.max(runtimePaths.size, 1)) * 100)

console.log(`OpenAPI paths: ${openapiPaths.size}`)
console.log(`Runtime route registrations: ${runtime.size} (${runtimePaths.size} unique path patterns)`)
console.log(`Approximate path coverage: ${coverage}% (min ${minCoverage}%)`)

if (missingRequired.length) {
  console.error(`Missing required OpenAPI paths: ${missingRequired.join(', ')}`)
  process.exit(1)
}

if (coverage < minCoverage) {
  console.error(`OpenAPI coverage ${coverage}% is below minimum ${minCoverage}%`)
  process.exit(1)
}

console.log('OpenAPI coverage check passed')