import { app } from 'electron'
import { existsSync, readFileSync, writeFileSync } from 'fs'
import { join } from 'path'

function readJson<T>(path: string, fallback: T): T {
  if (!existsSync(path)) return fallback
  try {
    return JSON.parse(readFileSync(path, 'utf-8')) as T
  } catch {
    return fallback
  }
}

function favPath(): string {
  return join(app.getPath('userData'), 'favorites.json')
}

function recentPath(): string {
  return join(app.getPath('userData'), 'recent.json')
}

export function getFavorites(): string[] {
  return readJson<string[]>(favPath(), [])
}

export function toggleFavorite(id: string): string[] {
  const favs = getFavorites()
  const updated = favs.includes(id) ? favs.filter((f) => f !== id) : [...favs, id]
  writeFileSync(favPath(), JSON.stringify(updated), 'utf-8')
  return updated
}

export function getRecent(): string[] {
  return readJson<string[]>(recentPath(), [])
}

export function addRecent(id: string): string[] {
  const recent = getRecent().filter((r) => r !== id)
  const updated = [id, ...recent].slice(0, 20)
  writeFileSync(recentPath(), JSON.stringify(updated), 'utf-8')
  return updated
}