import 'package:flutter_test/flutter_test.dart';
import 'package:tetrig/engine.dart';

Set<String> _cellSet(List<List<int>> cells) =>
    cells.map((c) => '${c[0]},${c[1]}').toSet();

String _kickStr(List<List<int>> k) => k.map((c) => '${c[0]},${c[1]}').join(' ');

void main() {
  // ── 피스 상태/회전 ──
  test('T 스폰 셀 = 위-포인팅', () {
    expect(_cellSet(states['T']![0]), {'0,1', '1,1', '2,1', '1,2'});
  });

  test('T CW(state1) = 오른쪽-포인팅', () {
    expect(_cellSet(states['T']![1]), {'1,0', '1,1', '1,2', '2,1'});
  });

  test('I CW(state1) = 세로', () {
    expect(_cellSet(states['I']![1]), {'2,0', '2,1', '2,2', '2,3'});
  });

  test('O는 회전 불변', () {
    final s0 = _cellSet(states['O']![0]);
    expect(_cellSet(states['O']![1]), s0);
    expect(_cellSet(states['O']![3]), s0);
  });

  test('모든 피스 4상태', () {
    for (final t in pieceTypes) {
      expect(states[t]!.length, 4);
    }
  });

  // ── 킥테이블 ──
  test('킥테이블 내용 (명세서 §4.1)', () {
    expect(_kickStr(kickTable('T', 0, 1)), '0,0 -1,0 -1,1 0,-2 -1,-2');
    expect(_kickStr(kickTable('I', 0, 1)), '0,0 -2,0 1,0 -2,-1 1,2');
    expect(_kickStr(kickTable('T', 0, 2)), '0,0 0,1 1,1 -1,1 1,0 -1,0');
    expect(_kickStr(kickTable('I', 0, 2)), '0,0');
    expect(_kickStr(kickTable('O', 0, 1)), '0,0');
  });

  test('벽킥: (0,0) 막히면 다음 오프셋으로 성사', () {
    final board = createBoard();
    board[5][5] = 'X';
    expect(collides(board, pieceCells('T', 1, 4, 5)), true);
    expect(collides(board, pieceCells('T', 1, 3, 5)), false); // (-1,0)
  });

  // ── 7-bag ──
  test('7-bag: 연속 7개는 7종 모두', () {
    final bag = SevenBag(makeRng(42));
    for (int r = 0; r < 20; r++) {
      final seven = [for (int i = 0; i < 7; i++) bag.next()]..sort();
      expect(seven, (List<String>.from(pieceTypes)..sort()));
    }
  });

  test('peek(5)==소비순서', () {
    final bag = SevenBag(makeRng(7));
    final peek = bag.peek(5);
    expect(peek.length, 5);
    for (int i = 0; i < 5; i++) {
      expect(bag.next(), peek[i]);
    }
  });

  test('시드 동일 → 동일 시퀀스', () {
    final a = SevenBag(makeRng(123)), b = SevenBag(makeRng(123));
    for (int i = 0; i < 30; i++) {
      expect(a.next(), b.next());
    }
  });

  // ── 충돌/클리어 ──
  test('collides 벽/바닥/점유', () {
    final bd = createBoard();
    expect(collides(bd, [[-1, 0]]), true);
    expect(collides(bd, [[10, 0]]), true);
    expect(collides(bd, [[0, -1]]), true);
    expect(collides(bd, [[5, 45]]), false);
    bd[3][4] = 'T';
    expect(collides(bd, [[4, 3]]), true);
  });

  test('clearLines 제거+하강', () {
    final bd = createBoard();
    for (int x = 0; x < 10; x++) bd[0][x] = 'I';
    bd[1][0] = 'T';
    expect(clearLines(bd), 1);
    expect(bd[0][0], 'T');
    for (int x = 1; x < 10; x++) expect(bd[0][x], null);
  });

  test('isBoardEmpty', () {
    final bd = createBoard();
    expect(isBoardEmpty(bd), true);
    bd[0][0] = 'I';
    expect(isBoardEmpty(bd), false);
  });

  // ── T-spin 판정 ──
  test('T-spin full', () {
    final bd = createBoard(10, 6);
    bd[1][4] = 'X'; bd[1][6] = 'X'; bd[3][4] = 'X';
    expect(detectTSpin(bd, 'T', 2, 4, 1, true), 'tspin');
  });

  test('T-spin mini', () {
    final bd = createBoard(10, 6);
    bd[1][4] = 'X'; bd[3][4] = 'X'; bd[3][6] = 'X';
    expect(detectTSpin(bd, 'T', 2, 4, 1, true), 'mini');
  });

  test('T-spin none (모서리 부족)', () {
    final bd = createBoard(10, 6);
    bd[1][4] = 'X';
    expect(detectTSpin(bd, 'T', 2, 4, 1, true), 'none');
  });

  test('T-spin none (회전 아님)', () {
    final bd = createBoard(10, 6);
    bd[1][4] = 'X'; bd[1][6] = 'X'; bd[3][4] = 'X';
    expect(detectTSpin(bd, 'T', 2, 4, 1, false), 'none');
  });

  test('T-spin 바닥은 채움 취급', () {
    final bd = createBoard(10, 6);
    expect(detectTSpin(bd, 'T', 2, 4, -1, true), 'none');
    bd[1][4] = 'X';
    expect(detectTSpin(bd, 'T', 2, 4, -1, true), 'tspin');
  });

  test('isDifficult 규칙', () {
    expect(isDifficult(4, 'none'), true);
    expect(isDifficult(2, 'tspin'), true);
    expect(isDifficult(1, 'mini'), true);
    expect(isDifficult(3, 'none'), false);
    expect(isDifficult(0, 'tspin'), false);
  });

  // ── 게임 흐름 ──
  test('락 딜레이 리셋 최대 15', () {
    final g = TetrigGame(seed: 1);
    int ok = 0;
    for (int i = 0; i < 25; i++) {
      if (g.resetLockDelay()) ok++;
    }
    expect(ok, Config.maxLockResets);
  });

  test('스폰/하드드롭 사이클', () {
    final g = TetrigGame(seed: 3);
    expect(g.over, false);
    final before = g.active.type;
    final res = g.hardDrop()!;
    expect(res.type, before);
    expect(g.holdUsed, false);
  });

  test('홀드 1회/피스', () {
    final g = TetrigGame(seed: 9);
    final first = g.active.type;
    expect(g.holdSwap(), true);
    expect(g.hold, first);
    expect(g.holdSwap(), false);
    g.hardDrop();
    expect(g.holdUsed, false);
    expect(g.holdSwap(), true);
  });

  test('콤보/B2B 누적', () {
    final g = TetrigGame(seed: 2);
    LockResult quad() {
      for (int y = 0; y < 4; y++) {
        for (int x = 1; x < 10; x++) g.board[y][x] = 'X';
      }
      final a = g.active;
      a.type = 'I';
      a.state = 1;
      a.x = -2;
      a.y = 0;
      g.lastMoveRotation = false;
      return g.hardDrop()!;
    }

    final r1 = quad();
    expect(r1.lines, 4);
    expect(r1.b2b, 0);
    final r2 = quad();
    expect(r2.lines, 4);
    expect(r2.b2b, 1);
  });

  test('톱아웃', () {
    final g = TetrigGame(seed: 1);
    for (int y = 18; y < 24; y++) {
      for (int x = 0; x < 10; x++) g.board[y][x] = 'X';
    }
    expect(g.spawn('T'), false);
    expect(g.over, true);
  });
}