// m13 life model: the whole world is one value, like the snake and the match.

/** @typedef {{x: number, y: number}} Point */
/** @typedef {{cells: Point[], running: boolean, seed: number, generation: number}} LifeState */
/** @typedef {{tag: 'Frame'} | {tag: 'Toggle', cell: Point} | {tag: 'TogglePause'} | {tag: 'Step'} | {tag: 'Clear'} | {tag: 'Randomize'}} LifeAction */

// The board, in cells: LW columns, LH rows, LCELL pixels per cell. Below it the page shows a status strip.
export const LW = 40
export const LH = 30
/** Pixels per cell. */
export const LCELL = 16
/** Height of the status strip under the board, in pixels. */
export const STRIP = 24

/** A fresh world: no live cells, paused, the given seed, generation 0.
 * @type {(seed: number) => LifeState} */
export const initialLife = (seed) => ({ cells: [], running: false, seed, generation: 0 })

/** Everything that can happen to the world, as data. `Toggle` carries the cell that was clicked.
 * @type {{Frame: LifeAction, Toggle: (cell: Point) => LifeAction, TogglePause: LifeAction, Step: LifeAction, Clear: LifeAction, Randomize: LifeAction}} */
export const LifeAction = {
  Frame: { tag: 'Frame' },
  Toggle: (cell) => ({ tag: 'Toggle', cell }),
  TogglePause: { tag: 'TogglePause' },
  Step: { tag: 'Step' },
  Clear: { tag: 'Clear' },
  Randomize: { tag: 'Randomize' },
}