export const dynamic = 'force-dynamic'

import { NextRequest, NextResponse } from 'next/server'
import { requireAdmin } from '@/lib/auth/require-admin'
import { asAdmin, withUser } from '@/lib/db/with-user'
import { trucks, incidents } from '@/lib/db/schema'
import { writeAuditLog } from '@/lib/db/audit'
import { eq, sql } from 'drizzle-orm'

export async function POST(request: NextRequest) {
  const { session } = await requireAdmin()
  if (!session) return NextResponse.json({ error: 'Forbidden' }, { status: 403 })

  const body: { truck_no?: string; carrier?: string } = await request.json().catch(() => ({}))
  const truck_no = (body.truck_no ?? '').trim()
  if (!truck_no) return NextResponse.json({ error: 'truck_no required' }, { status: 422 })

  try {
    const [truck] = await asAdmin(db =>
      db.insert(trucks).values({ truckNo: truck_no, carrier: (body.carrier ?? '').trim() || null }).returning({ id: trucks.id })
    )
    if (!truck) return NextResponse.json({ error: 'Insert failed' }, { status: 400 })
    await withUser(session.sub, async tx => {
      await writeAuditLog(tx, 'trucks', truck.id, 'INSERT', { truck_no, carrier: (body.carrier ?? '').trim() || null })
    })
    return NextResponse.json({ id: truck.id }, { status: 201 })
  } catch (e) {
    const code = (e as { code?: string }).code
    return NextResponse.json(
      { error: code === '23505' ? 'Truck number already exists' : 'Insert failed' },
      { status: 400 },
    )
  }
}

export async function PATCH(request: NextRequest) {
  const { session } = await requireAdmin()
  if (!session) return NextResponse.json({ error: 'Forbidden' }, { status: 403 })

  const body: { id?: string; active?: boolean } = await request.json().catch(() => ({}))
  if (!body.id) return NextResponse.json({ error: 'id required' }, { status: 422 })

  const [before] = await asAdmin(db =>
    db.select().from(trucks).where(eq(trucks.id, body.id!)).limit(1)
  )
  try {
    await asAdmin(db =>
      db.update(trucks).set({ active: body.active }).where(eq(trucks.id, body.id!))
    )
  } catch {
    return NextResponse.json({ error: 'Update failed' }, { status: 500 })
  }
  await withUser(session.sub, async tx => {
    await writeAuditLog(tx, 'trucks', body.id!, 'admin_update', { active: body.active }, before ?? null)
  })
  return NextResponse.json({ ok: true })
}

export async function DELETE(request: NextRequest) {
  const { session } = await requireAdmin()
  if (!session) return NextResponse.json({ error: 'Forbidden' }, { status: 403 })

  const body: { id?: string } = await request.json().catch(() => ({}))
  if (!body.id) return NextResponse.json({ error: 'id required' }, { status: 422 })

  const [countRow] = await asAdmin(db =>
    db.select({ cnt: sql<number>`count(*)` }).from(incidents).where(eq(incidents.truckId, body.id!))
  )
  const incidentCount = Number(countRow?.cnt ?? 0)
  if (incidentCount > 0)
    return NextResponse.json(
      { error: `Cannot delete — ${incidentCount} incident(s) reference this truck. Deactivate it instead.` },
      { status: 409 },
    )

  const [before] = await asAdmin(db =>
    db.select().from(trucks).where(eq(trucks.id, body.id!)).limit(1)
  )
  try {
    await asAdmin(db => db.delete(trucks).where(eq(trucks.id, body.id!)))
  } catch (e) {
    const code = (e as { code?: string }).code
    return NextResponse.json(
      { error: code === '23503' ? 'Cannot delete — truck still referenced. Deactivate instead.' : 'Delete failed' },
      { status: code === '23503' ? 409 : 500 },
    )
  }
  await withUser(session.sub, async tx => {
    await writeAuditLog(tx, 'trucks', body.id!, 'DELETE', null, before ?? null)
  })
  return NextResponse.json({ ok: true })
}