/**
 * The map: this game's one grid, and what its letters mean.
 *
 * Two sites (A left, B right), a mid corridor between the spawns, and a back
 * corridor along the bottom that links A main, spawn and B main — the flank.
 * Tiles are 80 units; a player is a circle of radius 16, so a one-tile
 * corridor is comfortably wide and a wall is never thin enough for a ray to
 * step over.
 *
 * The mechanics — collision, line of sight, the walk distance a bot uses to
 * path — are `engine/grid.ts`, bound here to these rows. What is this
 * game's own is the rows themselves and the reading of their letters: a
 * plant site, a spawn, where the orbs sit.
 */

import { makeGrid, segmentHitsCircle, segmentPoint, type Point } from "./engine/grid.ts";

export { segmentHitsCircle, segmentPoint, type Point };

export const TILE = 80;

// '#' wall · '.' floor · 'A'/'B' plant site · 'a' attacker spawn · 'd' defender spawn
const ROWS_SRC = [
  "##############################",
  "#........###.dddd.###........#",
  "#.AAAAA..###.dddd.###..BBBBB.#",
  "#.AAAAA..##........##..BBBBB.#",
  "#.AAAAA..##.#....#.##..BBBBB.#",
  "#.AAAAA..##........##..BBBBB.#",
  "#...##......#....#......##...#",
  "#..####....#......#....####..#",
  "#..####..###......###..####..#",
  "#..####..####....####..####..#",
  "#..####..####.##.####..####..#",
  "#........####.##.####........#",
  "#..####..####....####..####..#",
  "#..####..#####..#####..####..#",
  "#..####..#####..#####..####..#",
  "#..####..###......###..####..#",
  "#........##..aaaa..##........#",
  "#............aaaa............#",
  "##############################",
];

const board = makeGrid(ROWS_SRC, TILE);

export const COLS = board.cols;
export const ROWS = board.rows;
export const WIDTH = board.width;
export const HEIGHT = board.height;

export const grid: string[] = ROWS_SRC;
export const gridRows = (): string[] => ROWS_SRC.slice();

export type Site = "A" | "B";

export const solidTile = board.solidTile;
export const tileOf = board.tileOf;
export const centreOf = board.centreOf;
export const solidAt = board.solidAt;
export const moveCircle = board.moveCircle;
export const blockedCircle = board.blockedCircle;
export const wallBetween = board.wallBetween;
export const rayHitWall = board.rayHitWall;
export const walkDistance = board.walkDistance;
export const pathStep = board.pathStep;
export const clearPaths = board.clearPaths;

/** The site a point plants on, or null: the spike only arms inside a site. */
export const siteAt = (x: number, y: number): Site | null => {
  const c = board.cellAt(x, y);
  return c === "A" || c === "B" ? c : null;
};

export const spawnCells = (side: "atk" | "def"): Point[] => board.cellsOf(side === "atk" ? "a" : "d");
export const siteCells = (site: Site): Point[] => board.cellsOf(site);

export const siteCentre = (site: Site): Point => {
  const cells = siteCells(site);
  const sum = cells.reduce((a, p) => ({ x: a.x + p.x, y: a.y + p.y }), { x: 0, y: 0 });
  return { x: sum.x / cells.length, y: sum.y / cells.length };
};

/** Ult orbs: one on each half of mid, free for whoever walks over them. */
export const orbSpots = (): Point[] => [centreOf(4, 11), centreOf(25, 11)];