// Pong (pong.html) on every track, judged against the pure model.
import { test, expect, TRACKS } from '../lib/app.mjs'

// The player's paddle is the white 8 x 64 rect in column 2 (x = 16); its top row in cells is y / 8.
const lastScene = (shapes) => shapes.slice(Math.max(0, shapes.findLastIndex((s) => s.tag === 'Rect' && s.w === 640)))
const paddleOf = (shapes) => lastScene(shapes).find((s) => s.tag === 'Rect' && s.x === 16 && s.h === 64).y / 8
const textsOf = (shapes) => lastScene(shapes).filter((s) => s.tag === 'Text').map((s) => s.text)

for (const track of TRACKS) {
  test.describe(`${track}: pong`, () => {
    test('holding and releasing keys moves the paddle as the model says', async ({ app }) => {
      const a = await (await app(track, 'pong')).start()
      const p0 = paddleOf(await a.expectInSync())
      await a.down('ArrowUp')
      await a.advance(300)
      const p1 = paddleOf(await a.expectInSync('holding ArrowUp'))
      await a.up('ArrowUp')
      await a.advance(300)
      const p2 = paddleOf(await a.expectInSync('released'))
      await a.down('ArrowDown')
      await a.advance(600)
      const p3 = paddleOf(await a.expectInSync('holding ArrowDown'))
      await a.up('ArrowDown')
      await a.advance(100)
      await a.expectInSync('released again')
      // One cell per 30 ms game frame while held, none after release.
      expect(p0).toBe(21)
      expect(p1).toBeLessThan(p0)
      expect(p2).toBe(p1)
      expect(p3).toBeGreaterThan(p2)
    })

    test('a whole match on the fake clock ends with the model\'s score and the right winner text', async ({ app }) => {
      const a = await (await app(track, 'pong')).start()
      // A simple player: every 90 ms, hold the key that brings the paddle's middle toward the ball.
      let held = null
      for (let i = 0; i < 1000 && a.state.status === 'Playing'; i++) {
        const { ball, player } = a.state
        const want = player + 4 < ball.y - 1 ? 'ArrowDown' : player + 4 > ball.y + 1 ? 'ArrowUp' : null
        if (want !== held) {
          if (held) await a.up(held)
          if (want) await a.down(want)
          held = want
        }
        await a.advance(90)
        if (i % 10 === 0) await a.expectInSync(`match, ${i * 90} ms`)
      }
      if (held) await a.up(held)
      await a.advance(500)
      const end = await a.expectInSync('match over')
      const { score } = a.state
      expect(a.state.status).toBe('Over')
      expect(Math.max(score.player, score.cpu)).toBe(5)
      expect(textsOf(end)).toEqual(expect.arrayContaining([`${score.player}   ${score.cpu}`,
        score.player > score.cpu ? 'You Win!' : 'CPU Wins', 'Press R to restart']))
    })

    test('R restarts and keeps a held key', async ({ app }) => {
      const a = await (await app(track, 'pong')).start()
      await a.advance(300)
      await a.down('ArrowDown')
      await a.advance(150)
      const before = paddleOf(await a.expectInSync('holding ArrowDown'))
      await a.press('r')
      const restarted = paddleOf(await a.expectInSync('after R'))
      await a.advance(300)
      const after = paddleOf(await a.expectInSync('after R, still holding'))
      await a.up('ArrowDown')
      await a.expectInSync('released')
      expect(before).toBeGreaterThan(21)
      expect(restarted).toBe(21)
      expect(after).toBeGreaterThan(21)
    })
  })
}