import assert from "node:assert"
import dotenv from "dotenv"

dotenv.config()

// Actual
export const ACTUAL_SYNC_ID = getOrThrow("ACTUAL_SYNC_ID")
export const ACTUAL_SERVER_URL = getOrThrow("ACTUAL_SERVER_URL")
export const ACTUAL_PASSWORD = getOrThrow("ACTUAL_PASSWORD")
export const ACTUAL_ACCOUNT_IDS = getArrayOrThrow("ACTUAL_ACCOUNT_IDS")
export const ACTUAL_DATA_DIR = getOrDefault("ACTUAL_DATA_DIR", ".cache")

// Bank
export const BANK_INITIAL_REFRESH_TOKEN = getOrThrow(
  "BANK_INITIAL_REFRESH_TOKEN",
)
export const BANK_OAUTH_CLIENT_ID = getOrThrow("BANK_OAUTH_CLIENT_ID")
export const BANK_OAUTH_CLIENT_SECRET = getOrThrow("BANK_OAUTH_CLIENT_SECRET")
export const BANK_ACCOUNT_IDS = getArrayOrThrow("BANK_ACCOUNT_IDS")

// Configuration
export const DB_DIRECTORY = getOrDefault("DB_DIRECTORY", "data")
export const DB_FILENAME = getOrDefault("DB_FILENAME", "default")
export const LOG_LEVEL = getOrDefault("LOG_LEVEL", "info")
// Relative number of days in the past to start fetching transactions from
export const TRANSACTION_RELATIVE_FROM_DATE = getNumberOrDefault(
  "TRANSACTION_RELATIVE_FROM_DATE",
  4,
)
// Relative number of days in the past to end fetching transactions from
export const TRANSACTION_RELATIVE_TO_DATE = getNumberOrDefault(
  "TRANSACTION_RELATIVE_TO_DATE",
  3,
)

// Utility functions
function getOrDefault(key: string, def: string): string {
  return process.env[key] || def
}

function getOrThrow(key: string): string {
  const value = process.env[key]
  assert(value, `Missing environment variable: ${key}`)
  return value
}

function getArrayOrThrow(key: string): ReadonlyArray<string> {
  return getOrThrow(key).split(",")
}

function getNumberOrDefault(key: string, def: number): number {
  const num = Number(process.env[key])
  return Number.isNaN(num) ? def : num
}