import { eq } from 'drizzle-orm';
import { getGameDb, persist } from '@/lib/db/client';
import { LOCAL_PLAYER } from '@/lib/db/localPlayer';
import * as schema from '@/lib/db/schema';
import { getStateSnapshot } from '@/lib/game/state';
import { tickNow } from '@/lib/sim/engine';

// TEST-ONLY hook (v0.42.0, ISS-082) — lets the e2e suite force a plane's fuel level now that the
// manual /refuel endpoint is gone (dispatch auto-refuels instead). Disabled unless FLIGHT_TEST_HOOKS=1
// (set in docker-compose.yml for the e2e instance only); every other deployment 404s here. Sibling of
// /api/test/set-health — same gate, same conventions.
//
// POST /api/test/set-fuel
//   body { planeId: string, fuel: number } — both required; planeId must name an existing plane
//   (404 otherwise) and fuel a finite number in [0, the plane's maxFuel] (400 outside). Sets the
//   planes row's fuel directly and returns the full state snapshot after ticking.

export async function POST(req: Request) {
  if (process.env.FLIGHT_TEST_HOOKS !== '1') {
    return Response.json({ error: 'test hooks disabled' }, { status: 404 });
  }

  let body: unknown = {};
  try {
    const text = await req.text();
    body = text ? JSON.parse(text) : {};
  } catch {
    return Response.json({ error: 'invalid JSON body' }, { status: 400 });
  }
  if (typeof body !== 'object' || body === null || Array.isArray(body)) {
    return Response.json({ error: 'body must be a JSON object' }, { status: 400 });
  }
  const input = body as Record<string, unknown>;
  for (const key of Object.keys(input)) {
    if (key !== 'planeId' && key !== 'fuel') {
      return Response.json({ error: `unknown field "${key}"` }, { status: 400 });
    }
  }
  const planeId = input.planeId;
  if (typeof planeId !== 'string' || planeId.length === 0) {
    return Response.json({ error: 'planeId is required and must be a non-empty string' }, { status: 400 });
  }
  const fuel = input.fuel;
  if (typeof fuel !== 'number' || !Number.isFinite(fuel)) {
    return Response.json({ error: 'fuel is required and must be a finite number' }, { status: 400 });
  }

  try {
    const inst = await getGameDb();
    await tickNow(); // clock is current before the snapshot we return (same as siblings)
    const rows = await inst.db.select().from(schema.planes).where(eq(schema.planes.id, planeId));
    if (!rows[0]) {
      return Response.json({ error: `plane ${planeId} not found` }, { status: 404 });
    }
    if (fuel < 0 || fuel > rows[0].maxFuel) {
      return Response.json({ error: `fuel must be in [0, maxFuel] — this plane's tank holds ${rows[0].maxFuel} L` }, { status: 400 });
    }

    await inst.db.update(schema.planes).set({ fuel }).where(eq(schema.planes.id, planeId));
    await persist(inst);
    // v1.3.0 (ISS-110): admin-style hook — no session; the snapshot reports the seeded local account.
    return Response.json(await getStateSnapshot(LOCAL_PLAYER.id));
  } catch (err) {
    console.error('test hook failed', err);
    return Response.json({ error: 'test hook failed' }, { status: 500 });
  }
}