shared/board.ts

export const CELL_SIZE = 40
export const BOARD_SIZE = 15

export interface CameraState {
  x: number
  y: number
  zoom: number
}

export interface Bounds {
  minX: number
  minY: number
  maxX: number
  maxY: number
}

export function serializeCoord(x: number, y: number): string {
  return `${x}:${y}`
}

export function deserializeCoord(key: string): { x: number; y: number } {
  const [x, y] = key.split(':').map(Number)
  return { x, y }
}

export function isBoardCoordInBounds(x: number, y: number, boardSize: number): boolean {
  return Number.isInteger(x) && Number.isInteger(y) && x >= 0 && x < boardSize && y >= 0 && y < boardSize
}

export function worldToScreen(
  wx: number, wy: number,
  camera: CameraState,
  vw: number, vh: number,
): { x: number; y: number } {
  return {
    x: (wx - camera.x) * camera.zoom + vw / 2,
    y: (wy - camera.y) * camera.zoom + vh / 2,
  }
}

export function screenToWorld(
  sx: number, sy: number,
  camera: CameraState,
  vw: number, vh: number,
): { x: number; y: number } {
  return {
    x: (sx - vw / 2) / camera.zoom + camera.x,
    y: (sy - vh / 2) / camera.zoom + camera.y,
  }
}