// ── Traccar GPS API ──────────────────────────────────────────────────────────
// Polls Traccar for real-time device positions.
// Auth: session cookie via POST /api/session
// ─────────────────────────────────────────────────────────────────────────────

// Use proxy on same origin to avoid mixed content (HTTPS → HTTP)
const TRACCAR_URL = window.location.hostname === 'localhost'
  ? 'http://tracker.targointernet.com:8082'
  : window.location.origin + '/traccar'
const TRACCAR_USER = 'louis@targo.ca'
const TRACCAR_PASS = 'targo2026'

let _devices = []

// Use Basic auth — works through proxy without cookies
function authOpts () {
  return {
    headers: {
      Authorization: 'Basic ' + btoa(TRACCAR_USER + ':' + TRACCAR_PASS),
      Accept: 'application/json',
    }
  }
}

// ── Devices ──────────────────────────────────────────────────────────────────
export async function fetchDevices () {
  try {
    const res = await fetch(TRACCAR_URL + '/api/devices?all=true', authOpts())
    if (res.ok) {
      _devices = await res.json()
      return _devices
    }
  } catch {}
  return _devices
}

// ── Positions ────────────────────────────────────────────────────────────────
// Traccar API only supports ONE deviceId per request — fetch in parallel
export async function fetchPositions (deviceIds = null) {
  if (!deviceIds || !deviceIds.length) return []
  const results = await Promise.allSettled(
    deviceIds.map(id =>
      fetch(TRACCAR_URL + '/api/positions?deviceId=' + id, authOpts())
        .then(r => r.ok ? r.json() : [])
    )
  )
  return results.flatMap(r => r.status === 'fulfilled' ? r.value : [])
}

// ── Get position for a specific device ───────────────────────────────────────
export async function fetchDevicePosition (deviceId) {
  const positions = await fetchPositions([deviceId])
  return positions[0] || null
}

// ── Get all positions mapped by deviceId ─────────────────────────────────────
export async function fetchAllPositions () {
  // Get devices we care about (online + offline with recent position)
  if (!_devices.length) await fetchDevices()
  const deviceIds = _devices.filter(d => d.positionId).map(d => d.id)
  if (!deviceIds.length) return {}

  const positions = await fetchPositions(deviceIds)
  const map = {}
  positions.forEach(p => { map[p.deviceId] = p })
  return map
}

// ── Utility: match device to tech by uniqueId or name ────────────────────────
export function matchDeviceToTech (devices, techs) {
  const matched = []
  for (const tech of techs) {
    const traccarId = tech.traccarDeviceId
    if (!traccarId) continue
    const device = devices.find(d => d.id === parseInt(traccarId) || d.uniqueId === traccarId)
    if (device) matched.push({ tech, device })
  }
  return matched
}

// ── Session (required for WebSocket auth) ────────────────────────────────────
export async function createTraccarSession () {
  try {
    const res = await fetch(TRACCAR_URL + '/api/session', {
      method: 'POST',
      credentials: 'include',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: new URLSearchParams({ email: TRACCAR_USER, password: TRACCAR_PASS }),
    })
    return res.ok
  } catch { return false }
}

export { TRACCAR_URL, _devices as cachedDevices }