import Database from "better-sqlite3"

import { type OAuthTokenResponse } from "@/bank/sparebank1.ts"
import dayjs, { type Dayjs } from "dayjs"

export type TokenResponse = {
  key: TokenKey
  token: string
  expires_at: Dayjs
}

export type TokenResponseRaw = {
  key: TokenResponse["key"]
  token: TokenResponse["token"]
  expires_at: string
}

export type TokenKey = "access-token" | "refresh-token"

export function createDb(filepath: string) {
  const db = new Database(filepath)
  db.pragma("journal_mode = WAL")
  db.exec(
    "CREATE TABLE IF NOT EXISTS tokens ('key' VARCHAR PRIMARY KEY, token VARCHAR NOT NULL, expires_at DATETIME NOT NULL)",
  )
  return db
}

export function insertTokens(
  db: Database.Database,
  oAuthToken: OAuthTokenResponse,
): void {
  insertAccessToken(db, oAuthToken.access_token, oAuthToken.expires_in)
  insertRefreshToken(
    db,
    oAuthToken.refresh_token,
    oAuthToken.refresh_token_absolute_expires_in,
  )
}

function insertAccessToken(
  db: Database.Database,
  accessToken: string,
  expiresIn: number,
) {
  insert(db, "access-token", accessToken, expiresIn)
}

function insertRefreshToken(
  db: Database.Database,
  refreshToken: string,
  expiresIn: number,
): void {
  insert(db, "refresh-token", refreshToken, expiresIn)
}

function insert(
  db: Database.Database,
  key: TokenKey,
  token: string,
  expiresIn: number,
): void {
  db.prepare("INSERT OR REPLACE INTO tokens VALUES (?, ?, ?)").run(
    key,
    token,
    dayjs().add(expiresIn, "seconds").toISOString(),
  )
}

export function fetchToken(
  db: Database.Database,
  tokenKey: TokenKey,
): TokenResponse | null {
  const response = db
    .prepare("SELECT * FROM tokens WHERE key = ?")
    .get(tokenKey) as TokenResponseRaw | null

  return (
    response && {
      ...response,
      expires_at: dayjs(response.expires_at),
    }
  )
}

export function clearTokens(db: Database.Database): void {
  db.prepare("DELETE FROM tokens WHERE key in ( ?, ? )").run([
    "access-token",
    "refresh-token",
  ] as TokenKey[])
}