// ── Dependency Check ─────────────────────────────────────────────────
// Verifies all packages listed in package.json are installed.
// Auto-runs npm install if any are missing — zero manual setup steps.

import { readFileSync, existsSync } from "node:fs"
import { resolve, dirname } from "node:path"
import { fileURLToPath } from "node:url"
import { execSync } from "node:child_process"
import { platform } from "node:os"

const __dirname = dirname(fileURLToPath(import.meta.url))
const root = resolve(__dirname, "..")

try {
  const pkg = JSON.parse(readFileSync(resolve(root, "package.json"), "utf8"))
  const allDeps = { ...pkg.dependencies, ...pkg.devDependencies }

  const missing = Object.keys(allDeps).filter(name => {
    const pkgDir = resolve(root, "node_modules", name)
    return !existsSync(resolve(pkgDir, "package.json"))
  })

  if (missing.length > 0) {
    console.log(`\n${missing.length} package(s) missing: ${missing.join(", ")}`)
    console.log("Installing...\n")
    execSync("npm install --no-audit --no-fund", { cwd: root, stdio: "inherit", timeout: 120000 })
    console.log("Dependencies installed\n")
  }
} catch {
  // If package.json read or resolution fails, skip silently
}

// ── Port Precheck ──────────────────────────────────────────────────
// Kills any existing processes on ports 3001, 3006, 3007, 3008.
// These are the AI server, Next.js frontend, Signaling server, and
// Python scraper respectively.
// Runs before anything else starts to avoid EADDRINUSE errors.

const PORTS = [3001, 3006, 3007, 3008]

if (platform() === "win32") {
  // Windows: use netstat + findstr to find listening PIDs, then taskkill
  for (const port of PORTS) {
    try {
      const out = execSync(`netstat -ano | findstr "LISTENING" | findstr ":${port} "`, { encoding: "utf8", timeout: 5000 })
      const lines = out.trim().split("\n").filter(Boolean)
      for (const line of lines) {
        const parts = line.trim().split(/\s+/)
        const pid = parts[parts.length - 1]
        if (pid) {
          try { execSync(`taskkill /F /PID ${pid}`, { stdio: "ignore", timeout: 3000 }); console.log(`Freed port ${port} (PID ${pid})`) } catch {}
        }
      }
    } catch {}
  }
} else {
  // Linux/Mac: use lsof -ti to find PIDs, then kill -9
  for (const port of PORTS) {
    try {
      const pid = execSync(`lsof -ti:${port} 2>/dev/null`, { encoding: "utf8", timeout: 5000 }).trim()
      if (pid) {
        execSync(`kill -9 ${pid}`, { stdio: "ignore", timeout: 3000 })
        console.log(`Freed port ${port} (PID ${pid})`)
      }
    } catch {}
  }
}