import * as fs from 'fs/promises'
import * as path from 'path'
import { z } from 'zod'
import { getConfigDir } from './config.js'
import type { MarketV1ClientOptions } from './v1/client.js'

const installationIdSchema = z.string().uuid()

function installationIdPath(): string {
  return path.join(getConfigDir(), 'installation-id')
}

export async function getInstallationId(): Promise<string> {
  try {
    return installationIdSchema.parse((await fs.readFile(installationIdPath(), 'utf-8')).trim())
  } catch (error) {
    if (!isMissingFile(error)) throw error
  }

  const dir = getConfigDir()
  const installationId = crypto.randomUUID()
  await fs.mkdir(dir, { recursive: true })
  await fs.chmod(dir, 0o700)
  await fs.writeFile(installationIdPath(), `${installationId}\n`, {
    encoding: 'utf-8',
    flag: 'wx',
    mode: 0o600,
  })
  return installationId
}

export async function getCliSource(): Promise<NonNullable<MarketV1ClientOptions['source']>> {
  const analyticsDisabled =
    process.env.DO_NOT_TRACK === '1' || process.env.MARKET_TELEMETRY_DISABLED === '1'
  return {
    surface: 'cli',
    distinctId: analyticsDisabled ? undefined : await getInstallationId(),
    analyticsDisabled,
  }
}

function isMissingFile(error: unknown): boolean {
  return error instanceof Error && 'code' in error && error.code === 'ENOENT'
}