import { type Actual, ActualImpl } from "@/actual.ts"
import { cronJobDaily } from "@/cron.ts"
import {
  type Bank,
  Sparebank1Impl,
  type Transaction,
} from "@/bank/sparebank1.ts"
import { bankTransactionIntoActualTransaction } from "@/mappings.ts"
import {
  ACTUAL_ACCOUNT_IDS,
  ACTUAL_DATA_DIR,
  BANK_ACCOUNT_IDS,
  DB_DIRECTORY,
  DB_FILENAME,
} from "../config.ts"
import logger from "@/logger.ts"
import type { UUID } from "node:crypto"
import { createDb } from "@/bank/db/queries.ts"
import * as fs from "node:fs"
import { CronJob } from "cron"

// TODO Transports api for pino https://github.com/pinojs/pino/blob/HEAD/docs/transports.md
// TODO move tsx to devDependency. Requires ts support for Node with support for @ alias
// TODO verbatimSyntax in tsconfig, conflicts with jest
// TODO multi module project. Main | DAL | Sparebank1 impl
// TODO store last fetched date in db, and refetch from that date, if app has been offline for some time

export async function daily(actual: Actual, bank: Bank): Promise<void> {
  // Fetch transactions from the bank
  const transactions = await fetchTransactionsFromPastDay(bank)
  logger.info(`Fetched ${transactions.length} transactions`)

  // TODO multiple accounts
  const accountId = ACTUAL_ACCOUNT_IDS[0] as UUID
  const actualTransactions = transactions.map((transaction) =>
    // TODO move to Bank interface?
    bankTransactionIntoActualTransaction(transaction, accountId),
  )

  // TODO Import transactions into Actual
  //  If multiple accounts, loop over them
  //  Get account ID from mapper

  const response = await actual.importTransactions(
    accountId,
    actualTransactions,
  )
  logger.info(`ImportTransactionsResponse=${JSON.stringify(response)}`)
}

async function fetchTransactionsFromPastDay(
  bank: Bank,
): Promise<ReadonlyArray<Transaction>> {
  const response = await bank.transactionsPastDay(...BANK_ACCOUNT_IDS)
  return response.transactions
}

function createDirIfMissing(directory: string): void {
  if (!fs.existsSync(directory)) {
    logger.info(`Missing '${directory}', creating...`)
    fs.mkdirSync(directory, { recursive: true })
  }
}

async function main(): Promise<void> {
  logger.info("Starting application")

  createDirIfMissing(ACTUAL_DATA_DIR)
  createDirIfMissing(DB_DIRECTORY)

  const actual = await ActualImpl.init()
  const databaseFilePath = `${DB_DIRECTORY}/${DB_FILENAME}.sqlite`
  const db = createDb(databaseFilePath)
  logger.info(`Started Sqlite database at '${databaseFilePath}'`)
  const bank = new Sparebank1Impl(db)

  process.on("SIGINT", async () => {
    logger.info("Caught interrupt signal")
    await shutdown()
  })

  let cronJob: CronJob | undefined
  if (process.env.ONCE) {
    try {
      return await daily(actual, bank)
    } finally {
      await shutdown()
    }
  }

  logger.info("Waiting for CRON job to start")
  // TODO init and shutdown resources when job runs?
  try {
    cronJob = cronJobDaily(async () => await daily(actual, bank))
  } catch (exception) {
    logger.error(exception, "Caught exception at daily job, shutting down!")
    await shutdown()
  }

  async function shutdown(): Promise<void> {
    logger.info("Shutting down, Bye!")
    await actual.shutdown()
    db.close()
    cronJob?.stop()
  }
}

void main()