import { fail } from '@sveltejs/kit'
import type { Actions, PageServerLoad } from './$types'
import { Game } from './game'

export const load = (({ cookies }) => {
  const game = new Game(cookies.get('sverdle'))

  return {
    /**
     * The player's guessed words so far
     */
    guesses: game.guesses,

    /**
     * An array of strings like '__x_c' corresponding to the guesses, where 'x' means
     * an exact match, and 'c' means a close match (right letter, wrong place)
     */
    answers: game.answers,

    /**
     * The correct answer, revealed if the game is over
     */
    answer: game.answers.length >= 6 ? game.answer : null,
  }
}) satisfies PageServerLoad

export const actions = {
  /**
   * Modify game state in reaction to a keypress. If client-side JavaScript
   * is available, this will happen in the browser instead of here
   */
  update: async ({ request, cookies }) => {
    const game = new Game(cookies.get('sverdle'))

    const data = await request.formData()
    const key = data.get('key')

    const i = game.answers.length

    if (key === 'backspace') {
      game.guesses[i] = game.guesses[i].slice(0, -1)
    } else {
      game.guesses[i] += key
    }

    cookies.set('sverdle', game.toString(), { path: '/' })
  },

  /**
   * Modify game state in reaction to a guessed word. This logic always runs on
   * the server, so that people can't cheat by peeking at the JavaScript
   */
  enter: async ({ request, cookies }) => {
    const game = new Game(cookies.get('sverdle'))

    const data = await request.formData()
    const guess = data.getAll('guess') as string[]

    if (!game.enter(guess)) {
      return fail(400, { badGuess: true })
    }

    cookies.set('sverdle', game.toString(), { path: '/' })
  },

  restart: async ({ cookies }) => {
    cookies.delete('sverdle', { path: '/' })
  },
} satisfies Actions