import express, { type Request, type Response } from 'express'
import fs from 'fs/promises'
import path from 'path'
import { asyncHandler } from '../../utils/asyncHandler.js'
import { successResponse } from '../../utils/response.js'
import { NOTEBOOK_ROOT } from '../../config/paths.js'
import type { SettingsDTO } from '../../../shared/types.js'

const router = express.Router()

const getSettingsPath = () => path.join(NOTEBOOK_ROOT, '.config', 'settings.json')

router.get(
  '/',
  asyncHandler(async (req: Request, res: Response) => {
    const settingsPath = getSettingsPath()
    try {
      const content = await fs.readFile(settingsPath, 'utf-8')
      const settings = JSON.parse(content)
      successResponse(res, settings)
    } catch (error) {
      successResponse(res, {})
    }
  }),
)

router.post(
  '/',
  asyncHandler(async (req: Request, res: Response) => {
    const settings = req.body as SettingsDTO
    const settingsPath = getSettingsPath()
    const configDir = path.dirname(settingsPath)

    try {
      await fs.mkdir(configDir, { recursive: true })
      
      let existingSettings = {}
      try {
        const content = await fs.readFile(settingsPath, 'utf-8')
        existingSettings = JSON.parse(content)
      } catch {
      }

      const newSettings = { ...existingSettings, ...settings }
      await fs.writeFile(settingsPath, JSON.stringify(newSettings, null, 2), 'utf-8')
      
      successResponse(res, newSettings)
    } catch (error) {
      throw error
    }
  }),
)

export default router