// owm-stub — OpenWeatherMap stand-in for the e2e profile (AZ-456 AC-2).
// Returns canned `/data/2.5/weather` responses keyed by lat,lon. A request log
// is exposed at `/mock/log` for resilience tests; `/mock/config` swaps the
// canned set without restarting the container.

interface WindResponse {
  wind: { speed: number; deg: number }
  name: string
  coord: { lat: number; lon: number }
}

const PORT = Number(process.env.PORT ?? 8081)

let cannedResponses: Record<string, WindResponse> = {
  '0,0': { wind: { speed: 5.0, deg: 270 }, name: 'TestCity', coord: { lat: 0, lon: 0 } },
  '50.45,30.52': { wind: { speed: 7.5, deg: 90 }, name: 'Kyiv', coord: { lat: 50.45, lon: 30.52 } },
}

const requestLog: Array<{ ts: string; method: string; url: string }> = []

function key(lat: string | null, lon: string | null): string {
  return `${lat ?? '0'},${lon ?? '0'}`
}

const server = Bun.serve({
  port: PORT,
  fetch(req) {
    const url = new URL(req.url)
    requestLog.push({ ts: new Date().toISOString(), method: req.method, url: url.pathname + url.search })

    if (url.pathname === '/health') {
      return new Response('ok', { status: 200 })
    }

    if (url.pathname === '/mock/log') {
      return Response.json(requestLog)
    }

    if (url.pathname === '/mock/config' && req.method === 'POST') {
      return req.json().then((body) => {
        cannedResponses = body as Record<string, WindResponse>
        return new Response(null, { status: 204 })
      })
    }

    if (url.pathname === '/data/2.5/weather') {
      const lat = url.searchParams.get('lat')
      const lon = url.searchParams.get('lon')
      const k = key(lat, lon)
      const payload = cannedResponses[k] ?? cannedResponses['0,0']
      return Response.json(payload)
    }

    return new Response('not found', { status: 404 })
  },
})

console.log(`[owm-stub] listening on :${server.port}`)