import { log, error as logError } from '../logger'
import {
  storeCreateWorkItem,
  storeGetWorkItem,
  storeGetPendingWorkItem,
  storeUpdateWorkItem,
  storeListSessionsByEnvironment,
  storeGetEnvironment,
} from '../store'
import { config } from '../config'
import { getBaseUrl } from '../config'
import type { WorkResponse } from '../types/api'

/** Encode work secret as base64 JSON (no JWT — just API key as token) */
function encodeWorkSecret(): string {
  const payload = {
    version: 1,
    session_ingress_token: config.apiKeys[0] || '',
    api_base_url: getBaseUrl(),
    sources: [] as string[],
    auth: [] as string[],
    use_code_sessions: false,
  }
  return Buffer.from(JSON.stringify(payload)).toString('base64url')
}

export async function createWorkItem(
  environmentId: string,
  sessionId: string,
): Promise<string> {
  // Validate environment exists and is active
  const env = storeGetEnvironment(environmentId)
  if (!env) {
    throw new Error(`Environment ${environmentId} not found`)
  }
  if (env.status !== 'active') {
    throw new Error(
      `Environment ${environmentId} is not active (status: ${env.status})`,
    )
  }

  const secret = encodeWorkSecret()
  const record = storeCreateWorkItem({ environmentId, sessionId, secret })
  log(
    `[RCS] Work item created: ${record.id} for env=${environmentId} session=${sessionId}`,
  )
  return record.id
}

/** Long-poll for work — blocks until work is available or timeout.
 *  Returns null when no work is available, matching the CLI bridge client protocol. */
export async function pollWork(
  environmentId: string,
  timeoutSeconds = config.pollTimeout,
): Promise<WorkResponse | null> {
  const deadline = Date.now() + timeoutSeconds * 1000

  while (Date.now() < deadline) {
    const item = storeGetPendingWorkItem(environmentId)

    if (item) {
      storeUpdateWorkItem(item.id, { state: 'dispatched' })

      return {
        id: item.id,
        type: 'work',
        environment_id: environmentId,
        state: 'dispatched',
        data: {
          type: 'session',
          id: item.sessionId,
        },
        secret: item.secret,
        created_at: item.createdAt.toISOString(),
      }
    }

    await new Promise(r => setTimeout(r, 500))
  }

  return null
}

export function ackWork(workId: string) {
  storeUpdateWorkItem(workId, { state: 'acked' })
}

export function stopWork(workId: string) {
  storeUpdateWorkItem(workId, { state: 'completed' })
}

export function heartbeatWork(workId: string): {
  lease_extended: boolean
  state: string
  last_heartbeat: string
  ttl_seconds: number
} {
  storeUpdateWorkItem(workId, {} as any) // just bump updatedAt
  const item = storeGetWorkItem(workId)
  const now = new Date()
  return {
    lease_extended: true,
    state: item?.state ?? 'acked',
    last_heartbeat: now.toISOString(),
    ttl_seconds: config.heartbeatInterval * 2,
  }
}

/** Reconnect: re-queue sessions associated with an environment */
export function reconnectWorkForEnvironment(envId: string) {
  const activeSessions = storeListSessionsByEnvironment(envId).filter(
    s => s.status === 'idle',
  )
  const promises = activeSessions.map(s => createWorkItem(envId, s.id))
  return Promise.all(promises)
}