import { NextResponse } from 'next/server'
import { z } from 'zod'

export const dynamic = 'force-dynamic'

const schema = z.object({
  password: z.string().min(1),
  redirect: z.string().optional(),
})

// POST /api/auth/login
// Simple password-based auth. Password is set via ADMIN_PASSWORD env var.
// Returns a session cookie (HMAC-signed, 7-day expiry).
export async function POST(req: Request) {
  try {
    const parsed = schema.safeParse(await req.json())
    if (!parsed.success) {
      return NextResponse.json({ error: 'invalid request' }, { status: 400 })
    }
    const { password, redirect } = parsed.data

    const adminPassword = process.env.ADMIN_PASSWORD
    if (!adminPassword) {
      return NextResponse.json(
        { error: 'ADMIN_PASSWORD env not configured. Set it in Dokploy environment variables.' },
        { status: 503 }
      )
    }

    if (password !== adminPassword) {
      return NextResponse.json({ error: 'Falsches Passwort' }, { status: 401 })
    }

    // Create session token: base64(payload).hmac
    const crypto = await import('crypto')
    const payload = {
      sub: 'admin',
      iat: Date.now(),
      exp: Date.now() + 7 * 24 * 3600 * 1000, // 7 days
    }
    const payloadB64 = Buffer.from(JSON.stringify(payload)).toString('base64url')
    const key = process.env.AUTH_SECRET || adminPassword
    const signature = crypto
      .createHmac('sha256', key)
      .update(payloadB64)
      .digest('base64url')
    const token = `${payloadB64}.${signature}`

    const res = NextResponse.json({
      ok: true,
      redirect: redirect || '/',
    })
    res.cookies.set('aos-session', token, {
      httpOnly: true,
      secure: process.env.NODE_ENV === 'production',
      sameSite: 'lax',
      path: '/',
      maxAge: 7 * 24 * 3600, // 7 days
    })
    return res
  } catch {
    return NextResponse.json({ error: 'login failed' }, { status: 500 })
  }
}