export interface LogEntry {
  sequence: number
  timestamp_ms: number
  text: string
}

export interface TimelineBucket {
  start_ms: number
  count: number
}

export interface Stats {
  log_count: number
  first_sequence: number | null
  last_sequence: number | null
  first_timestamp_ms: number | null
  last_timestamp_ms: number | null
}

async function getJson<T>(path: string): Promise<T> {
  const res = await fetch(path)
  if (!res.ok) {
    throw new Error(`${path} failed: ${res.status}`)
  }
  return res.json() as Promise<T>
}

export function fetchLogs(params: {
  sinceSequence?: number
  startMs?: number
  endMs?: number
  limit?: number
}): Promise<LogEntry[]> {
  const search = new URLSearchParams()
  if (params.sinceSequence !== undefined) search.set('since_sequence', String(params.sinceSequence))
  if (params.startMs !== undefined) search.set('start_ms', String(params.startMs))
  if (params.endMs !== undefined) search.set('end_ms', String(params.endMs))
  if (params.limit !== undefined) search.set('limit', String(params.limit))
  return getJson(`/api/logs?${search.toString()}`)
}

export function fetchTimeline(params: {
  startMs?: number
  endMs?: number
  bucketMs?: number
}): Promise<TimelineBucket[]> {
  const search = new URLSearchParams()
  if (params.startMs !== undefined) search.set('start_ms', String(params.startMs))
  if (params.endMs !== undefined) search.set('end_ms', String(params.endMs))
  if (params.bucketMs !== undefined) search.set('bucket_ms', String(params.bucketMs))
  return getJson(`/api/timeline?${search.toString()}`)
}

export function fetchStats(): Promise<Stats> {
  return getJson('/api/stats')
}