import { describe, expect, it } from "vitest";
import {
  assembleBoard,
  edgeState,
  hasLineOfSight,
  layoutIds,
  stepTarget,
  type SectorPlacement,
} from "../src/board";
import { buildDeck } from "../src/cards";

describe("card data", () => {
  it("basic deck is exactly 125 cards (official 6e rulebook)", () => {
    expect(buildDeck(["basic"]).length).toBe(125);
  });

  it("basic + expansion1 is exactly 200 cards (125 + 75)", () => {
    expect(buildDeck(["basic", "expansion1"]).length).toBe(200);
  });

  it("number cards follow the official distribution", () => {
    const deck = buildDeck(["basic"]);
    const count = (id: string) => deck.filter((c) => c.cardId === id).length;
    expect(count("number-2")).toBe(12);
    expect(count("number-3")).toBe(10);
    expect(count("number-4")).toBe(7);
    expect(count("number-5")).toBe(4);
    expect(count("number-6")).toBe(1);
  });
});

describe("board assembly", () => {
  it("knows all six verified layouts", () => {
    expect(layoutIds().sort()).toEqual(
      ["board-a", "board-b", "board-c", "board-d", "board-e", "board-f"].sort(),
    );
  });

  const twoSector: SectorPlacement[] = [
    { boardId: "board-a", origin: { x: 0, y: 0 }, rotation: 0 },
    { boardId: "board-b", origin: { x: 0, y: 5 }, rotation: 0 },
  ];

  it("merges the junction between stacked sectors into a single wall with a centered corridor", () => {
    const board = assembleBoard(twoSector);
    // Junction edges y=4/5: wall everywhere except the centered opening x=2.
    expect(edgeState(board, { x: 0, y: 4 }, "S")).toBe("wall");
    expect(edgeState(board, { x: 1, y: 4 }, "S")).toBe("wall");
    expect(edgeState(board, { x: 2, y: 4 }, "S")).toBe("open");
    expect(edgeState(board, { x: 3, y: 4 }, "S")).toBe("wall");
    expect(edgeState(board, { x: 4, y: 4 }, "S")).toBe("wall");
    const step = stepTarget(board, { x: 2, y: 4 }, "S");
    expect(step).toEqual({ kind: "step", to: { x: 2, y: 5 } });
  });

  it("wraps the vertical openings top-to-bottom by default", () => {
    const board = assembleBoard(twoSector);
    const up = stepTarget(board, { x: 2, y: 0 }, "N");
    expect(up).toEqual({ kind: "warp", to: { x: 2, y: 9 } });
    const down = stepTarget(board, { x: 2, y: 9 }, "S");
    expect(down).toEqual({ kind: "warp", to: { x: 2, y: 0 } });
  });

  it("honors explicit crossed pairings (2-player diagram)", () => {
    const board = assembleBoard(twoSector, {
      warpPairs: [
        [{ sector: 0, side: "N" }, { sector: 1, side: "S" }],
        [{ sector: 0, side: "W" }, { sector: 1, side: "E" }],
        [{ sector: 0, side: "E" }, { sector: 1, side: "W" }],
      ],
    });
    // Leaving the top sector's west opening arrives at the bottom sector's east.
    expect(stepTarget(board, { x: 0, y: 2 }, "W")).toEqual({ kind: "warp", to: { x: 4, y: 7 } });
    expect(stepTarget(board, { x: 4, y: 7 }, "E")).toEqual({ kind: "warp", to: { x: 0, y: 2 } });
  });

  it("blocks steps through walls and doors", () => {
    const board = assembleBoard([{ boardId: "board-a", origin: { x: 0, y: 0 }, rotation: 0 }]);
    // Layout A wall V (2,1)|(2,2): 1-indexed row 2 col 1 east = 0-indexed (0,1) E.
    expect(stepTarget(board, { x: 0, y: 1 }, "E")).toEqual({ kind: "blocked", by: "wall" });
    // Layout A door H (3,2)-(4,2): 0-indexed (1,2) S.
    expect(stepTarget(board, { x: 1, y: 2 }, "S")).toEqual({ kind: "blocked", by: "door" });
  });

  it("rotating a sector 180 degrees preserves its wall count", () => {
    const flat = assembleBoard([{ boardId: "board-c", origin: { x: 0, y: 0 }, rotation: 0 }]);
    const rotated = assembleBoard([{ boardId: "board-c", origin: { x: 0, y: 0 }, rotation: 180 }]);
    const countWalls = (b: typeof flat) =>
      Object.values(b.edges).filter((e) => e === "wall").length;
    const countDoors = (b: typeof flat) =>
      Object.values(b.edges).filter((e) => e === "door").length;
    expect(countWalls(rotated)).toBe(countWalls(flat));
    expect(countDoors(rotated)).toBe(countDoors(flat));
    // Home stays centered under rotation.
    expect(rotated.homes[0]).toEqual({ x: 2, y: 2 });
  });

  it("computes line of sight blocked by walls", () => {
    const board = assembleBoard([{ boardId: "board-a", origin: { x: 0, y: 0 }, rotation: 0 }]);
    // Straight down col 0 from (0,0): wall H (3,1)|(4,1) = 0-indexed (0,2) S blocks.
    expect(hasLineOfSight(board, { x: 0, y: 0 }, { x: 0, y: 1 })).toBe(true);
    expect(hasLineOfSight(board, { x: 0, y: 0 }, { x: 0, y: 4 })).toBe(false);
    // Home (2,2) sees one cell up (open edge), but the wall between rows 1-2
    // of the home column blocks sight to the top row.
    expect(hasLineOfSight(board, { x: 2, y: 2 }, { x: 2, y: 1 })).toBe(true);
    expect(hasLineOfSight(board, { x: 2, y: 2 }, { x: 2, y: 0 })).toBe(false);
  });
});