tetris/tetris.py

import pygame
import pygame.draw as draw
from collections import namedtuple, defaultdict
from typing import NamedTuple, Any, Iterable, Optional, Callable
from functools import cache, lru_cache
import random
import math
from enum import Enum, auto

Cell = namedtuple("Cell", ["x", "y"])
Size = namedtuple("Size", ["width", "height"])
ColorSet = namedtuple("ColorSet", ["norm", "light", "dark"])


class Direction(int, Enum):
    LEFT = -1
    RIGHT = 1


def make_matrix(w: int, h: int, elt: Any = None) -> list[list]:
    if not w:
        return []
    return [[elt] * w for _ in range(h)]


def flip(mat: list[list]) -> list[list]:
    return list(reversed(mat))


def transpose(mat: list[list]) -> list[list]:
    if not mat:
        return []
    out = make_matrix(len(mat), len(mat[0]))
    for x in range(len(mat[0])):
        for y in range(len(mat)):
            out[x][y] = mat[y][x]
    return out


def mirror(mat: list[list]) -> list[list]:
    return [list(reversed(row)) for row in mat]


class Tetromino(NamedTuple):
    color: str
    shape: list[list]

    @property
    def height(self):
        return len(self.shape)

    @property
    def width(self):
        return len(self.shape[0])

    @property
    @lru_cache(maxsize=16)
    def x_adj(self):
        def clz(arr: list):
            for i, c in enumerate(arr):
                if c:
                    return i
            return len(arr)

        return min(map(clz, self.shape))

    @property
    @lru_cache(maxsize=16)
    def y_adj(self):
        for y, row in enumerate(self.shape):
            for x, cell in enumerate(row):
                if cell:
                    return y
        return self.height

    @property
    @lru_cache(maxsize=16)
    def bounding_box_width(self):
        def ctz(arr: list):
            for i, c in enumerate(reversed(arr)):
                if c:
                    return i
            return len(arr)

        return max(map(lambda r: len(r) - ctz(r), self.shape))

    @property
    @lru_cache(maxsize=16)
    def bounding_box_height(self):
        for y, row in reversed(list(enumerate(self.shape))):
            for x, cell in enumerate(row):
                if cell:
                    return y + 1
        return 0

    def rotated(self, times: int):
        """Return self rotated TIMES times to the right."""
        times %= 4
        if times == 0:
            return self
        if times == 1:
            return Tetromino(self.color, mirror(transpose(self.shape)))
        if times == 2:
            return Tetromino(self.color, mirror(flip(self.shape)))
        if times == 3:
            return Tetromino(self.color, flip(transpose(self.shape)))

    def __repr__(self):
        out = []
        for row in self.shape:
            for cell in row:
                out.append("*" if cell else " ")
            out.append("\n")
        return "".join(out)

    def __eq__(self, other):
        return id(self) == id(other)

    def __hash__(self):
        return id(self)


class HashableDict(dict):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

    def __eq__(self, other):
        return id(self) == id(other)

    def __hash__(self):
        return id(self)


class Action(NamedTuple):
    class Type(Enum):
        # In Game
        ROTATE_LEFT = auto()
        ROTATE_RIGHT = auto()
        SOFT_DROP = auto()
        HARD_DROP = auto()
        SWAP_HOLD = auto()
        MOVE_LEFT = auto()
        MOVE_RIGHT = auto()
        OPEN_HELP = auto()

        # Game over (also in game)
        RESTART = auto()

        # Help
        CLOSE_HELP = auto()

    key: int
    type: Type
    repeat: bool
    desc: str

    @staticmethod
    def make_map(*acts):
        return HashableDict({act.key: act for act in acts})


class Font:
    class Glyph(NamedTuple):
        char: str
        bitmap: list[str]

        @property
        def width(self):
            return len(self.bitmap[0])

        @property
        def height(self):
            return len(self.bitmap)

        @property
        def size(self) -> Size:
            return Size(self.width, self.height)

    def __init__(
        self,
        scale: int,
        kern: int,
        row_kern: int,
        glyphs: Iterable[Glyph] | dict[str, Glyph],
    ):
        self.scale = scale
        self.kern = kern
        self.row_kern = row_kern
        if isinstance(glyphs, dict):
            self.glyphs: dict[str, Font.Glyph] = dict(glyphs)
        else:
            self.glyphs: dict[str, Font.Glyph] = {g.char: g for g in glyphs}

    def scaled(
        self,
        new_scale: int,
        new_kern: Optional[int],
        new_row_kern: Optional[int],
    ):
        return Font(
            new_scale,
            self.kern if new_kern is None else new_kern,
            self.row_kern if new_row_kern is None else new_row_kern,
            self.glyphs,
        )

    @lru_cache(maxsize=16)
    def compute_extents(self, text: str) -> Size:
        text = text.lower()
        total_width = 0
        total_height = 0
        last_width = 0
        last_height = 0
        for char in text:
            if char == "\n":
                total_width = max(total_width, last_width)
                if last_width == 0:
                    # empty line
                    last_height = self.glyphs[" "].height * self.scale
                last_width = 0
                total_height += last_height + self.row_kern
                last_height = 0
            else:
                glyph = self.glyphs[char]
                last_width += glyph.width * self.scale + self.kern
                last_height = max(last_height, glyph.height * self.scale)
        total_width = max(last_width, total_width) - self.kern
        if total_width == 0:
            # empty line
            last_height = self.glyphs[" "].height * self.scale
        total_height += last_height
        return Size(total_width, total_height)

    def render_text(
        self, text: str, dest: pygame.surface.Surface, x: int, y: int, color
    ):
        text = text.lower()
        initial_x = x
        max_height = 0
        for char in text:
            if char == "\n":
                if x == initial_x:
                    # empty row
                    max_height = self.glyphs[" "].height * self.scale
                y += max_height + self.row_kern
                max_height = 0
                x = initial_x
            else:
                glyph = self.glyphs[char]
                dest.blit(self.render_glyph(char, color), (x, y))
                x += glyph.width * self.scale + self.kern
                max_height = max(max_height, glyph.height * self.scale)

    def center_text(
        self, text: str, dest: pygame.surface.Surface, x: int, y: int, color
    ):
        text = text.lower()
        exts = self.compute_extents(text)
        self.render_text(
            text, dest, x - (exts.width // 2), y - (exts.height // 2), color
        )

    @cache
    def render_glyph(self, char: str, color) -> pygame.surface.Surface:
        char = char.lower()
        glyph = self.glyphs[char]
        size = tuple(map(lambda d: d * self.scale, glyph.size))
        surf = pygame.surface.Surface(size, pygame.SRCALPHA)
        for y, row in enumerate(glyph.bitmap):
            for x, cell in enumerate(row):
                if cell != " ":
                    pygame.draw.rect(
                        surf,
                        color,
                        (
                            x * self.scale,
                            y * self.scale,
                            self.scale,
                            self.scale,
                        ),
                    )
        return surf


class LazyVariable:
    def __init__(self, thunk: Callable[[], Any]):
        self.thunk = thunk
        self.need_eval = True
        self.value = None

    def __get__(self, instance: Any, owner: Optional[type] = None):
        if self.need_eval:
            self.value = self.thunk()
            self.need_eval = False
        return self.value

    def __set__(self, instance: Any, value: Any):
        self.value = value
        self.need_eval = False


class Game:
    # Points
    DROP_POINTS = 1
    HARD_DROP_POINTS = 2
    POINTS_PER_LINE = [100, 300, 500, 800]

    LINES_PER_LEVEL = 10

    MOVE_SPEED = 20  # cells per second
    MOVE_INITIAL_SLOWDOWN = 3.0  # cells

    DROP_LEVEL_SCALE = 0.025
    # These are *= 1 + (DROP_LEVEL_SCALE * (LEVEL - 1))
    NORMAL_DROP_SPEED = 3  # cells per second
    FAST_DROP_SPEED = 30  # cells per second
    MOVED_DROP_SPEED = 1  # cells per second

    DROP_CLEAR_SCALE = 0.025
    # This is *= 1 - (DROP_CLEAR_SCALE * (LEVEL - 1))
    CLEAR_SPEED = 15  # frames per block

    BOARD_SIZE = Size(10, 20)  # Cell count
    CELL_SIZE = Size(30, 30)
    CELL_BORDER_SIZE = CELL_SIZE.width // 10
    CONTROLS_WIDTH = 160
    FRAMERATE = 120
    WINDOW_SIZE = Size(
        (BOARD_SIZE.width + 2) * CELL_SIZE.width + CONTROLS_WIDTH,
        (BOARD_SIZE.height + 2) * CELL_SIZE.height,
    )
    PALETTE = {
        "gray": ColorSet("#787878", "#9a9a9a", "#303030"),
        "purple": ColorSet("#9a00cd", "#cd00ff", "#66009a"),
        "yellow": ColorSet("#cdcd00", "#ffff00", "#9a9a00"),
        "red": ColorSet("#cd0000", "#ff0000", "#9a0000"),
        "orange": ColorSet("#cd6600", "#ff8900", "#9a4200"),
        "blue": ColorSet("#0000cd", "#0000ff", "#00009a"),
        "aqua": ColorSet("#00cdcd", "#00ffff", "#009a9a"),
        "green": ColorSet("#00cd00", "#00ff00", "#009a00"),
    }
    TETROMINOS = [
        Tetromino(
            "aqua", [[0, 0, 0, 0], [1, 1, 1, 1], [0, 0, 0, 0], [0, 0, 0, 0]]
        ),
        Tetromino("yellow", [[1, 1], [1, 1]]),
        Tetromino("purple", [[0, 0, 0], [1, 1, 1], [0, 1, 0]]),
        Tetromino("blue", [[0, 0, 1], [0, 0, 1], [0, 1, 1]]),
        Tetromino("orange", [[1, 0, 0], [1, 0, 0], [1, 1, 0]]),
        Tetromino("green", [[0, 1, 1], [1, 1, 0], [0, 0, 0]]),
        Tetromino("red", [[1, 1, 0], [0, 1, 1], [0, 0, 0]]),
    ]
    GAME_ACTION_MAP = Action.make_map(
        Action(
            pygame.K_z,
            Action.Type.ROTATE_LEFT,
            False,
            "Rotate the current piece left.",
        ),
        Action(
            pygame.K_x,
            Action.Type.ROTATE_RIGHT,
            False,
            "Rotate the current piece right.",
        ),
        Action(
            pygame.K_c,
            Action.Type.SWAP_HOLD,
            False,
            "Swap the current and held pieces.",
        ),
        Action(
            pygame.K_DOWN,
            Action.Type.SOFT_DROP,
            True,
            "Soft drop the current piece.",
        ),
        Action(
            pygame.K_SPACE,
            Action.Type.HARD_DROP,
            True,
            "Hard drop the current piece.",
        ),
        Action(
            pygame.K_LEFT,
            Action.Type.MOVE_LEFT,
            True,
            "Move the current piece left.",
        ),
        Action(
            pygame.K_RIGHT,
            Action.Type.MOVE_RIGHT,
            True,
            "Move the current piece right.",
        ),
        Action(
            pygame.K_r,
            Action.Type.RESTART,
            False,
            "Start a new game.",
        ),
        Action(
            pygame.K_h,
            Action.Type.OPEN_HELP,
            False,
            "Toggle the help menu/pause.",
        ),
    )
    GAME_OVER_ACTION_MAP = Action.make_map(
        Action(pygame.K_r, Action.Type.RESTART, False, "Start a new game.")
    )
    HELP_ACTION_MAP = Action.make_map(
        Action(
            pygame.K_ESCAPE,
            Action.Type.CLOSE_HELP,
            False,
            "Close the help menu.",
        ),
        Action(
            pygame.K_h,
            Action.Type.CLOSE_HELP,
            False,
            "Close the help menu.",
        ),
    )

    # The actual font data is long, so I put it at the end
    FONT = LazyVariable(lambda: Font(6, 3, 3, GLYPH_DATA))
    SMALL_FONT = LazyVariable(lambda: Game.FONT.scaled(4, 2, 2))
    TINY_FONT = LazyVariable(lambda: Game.FONT.scaled(2, 2, 2))
    CONTROL_DISPLAY_BORDER = 5
    INFO_BOX_BORDER_SIZE = 5
    HELP_MENU_INSET = 10
    CONTROLS_START_X = (BOARD_SIZE.width + 2) * CELL_SIZE.width

    @staticmethod
    @lru_cache(maxsize=1)
    def make_action_help_string(am: dict[int, Action]):
        key_names = [pygame.key.name(k) for k in am.keys()]
        max_key_len = max(map(len, key_names))
        out = "Keys:"
        for act in am.values():
            out += (
                f"\n{pygame.key.name(act.key).rjust(max_key_len)}: {act.desc}"
            )
        return out

    def __init__(self):
        self._game_over = False
        self.high_score = 0
        self._score = 0

    @staticmethod
    @lru_cache(maxsize=1)
    def make_score_help_string():
        return (
            "Points:\n"
            "10 lines clear to level up.\n"
            f"Soft drop: {Game.DROP_POINTS} * dist. * level\n"
            f"Hard drop: {Game.HARD_DROP_POINTS} * dist. * level\n"
            f"   1 line: {Game.POINTS_PER_LINE[0]} * level\n"
            f"  2 lines: {Game.POINTS_PER_LINE[1]} * level\n"
            f"  3 lines: {Game.POINTS_PER_LINE[2]} * level\n"
            f"  4 lines: {Game.POINTS_PER_LINE[3]} * level\n"
        )

    @property
    def game_over(self) -> bool:
        return self._game_over

    @game_over.setter
    def game_over(self, newval: bool):
        if newval != self._game_over:
            self.pending_actions = []
        self._game_over = newval
        if self._game_over:
            self.action_map = Game.GAME_OVER_ACTION_MAP
        else:
            self.action_map = Game.GAME_ACTION_MAP

    @property
    def score(self) -> int:
        return self._score

    @score.setter
    def score(self, newval: int):
        self._score = newval
        if newval > self.high_score:
            self.high_score = newval

    def random_tetromino(self):
        if not self.cur_random_peice_seq:
            self.cur_random_peice_seq = list(Game.TETROMINOS)
            random.shuffle(self.cur_random_peice_seq)
        return self.cur_random_peice_seq.pop(0)

    def draw_block(self, x: int, y: int, color, target=None):
        """Draw a block at (X, Y). Coordinates are for the top left corner."""
        if target is None:
            target = self.screen
        draw.rect(
            target,
            Game.PALETTE[color].norm,
            (x, y, Game.CELL_SIZE.width, Game.CELL_SIZE.height),
        )
        draw.polygon(
            target,
            Game.PALETTE[color].light,
            [
                (x, y),
                (x + Game.CELL_SIZE.width, y),
                (
                    x + Game.CELL_SIZE.width - Game.CELL_BORDER_SIZE,
                    y + Game.CELL_BORDER_SIZE,
                ),
                (x + Game.CELL_BORDER_SIZE, y + Game.CELL_BORDER_SIZE),
                (
                    x + Game.CELL_BORDER_SIZE,
                    y + Game.CELL_SIZE.width - Game.CELL_BORDER_SIZE,
                ),
                (x, y + Game.CELL_SIZE.height),
                (x, y),
            ],
        )
        draw.polygon(
            target,
            Game.PALETTE[color].dark,
            [
                (x + Game.CELL_SIZE.width, y),
                (
                    x + Game.CELL_SIZE.width - Game.CELL_BORDER_SIZE,
                    y + Game.CELL_BORDER_SIZE,
                ),
                (
                    x + Game.CELL_SIZE.width - Game.CELL_BORDER_SIZE,
                    y + Game.CELL_SIZE.height - Game.CELL_BORDER_SIZE,
                ),
                (
                    x + Game.CELL_BORDER_SIZE,
                    y + Game.CELL_SIZE.width - Game.CELL_BORDER_SIZE,
                ),
                (x, y + Game.CELL_SIZE.height),
                (x + Game.CELL_SIZE.width, y + Game.CELL_SIZE.height),
                (x + Game.CELL_SIZE.width, y),
            ],
        )

    def draw_board_border(self):
        bwidth = (Game.BOARD_SIZE.width + 2) * Game.CELL_SIZE.width
        bheight = Game.WINDOW_SIZE.height
        for x in range(Game.BOARD_SIZE.width + 2):
            self.draw_block(x * Game.CELL_SIZE.width, 0, "gray")
            self.draw_block(
                x * Game.CELL_SIZE.width,
                bheight - Game.CELL_SIZE.height,
                "gray",
            )
        for y in range(1, Game.BOARD_SIZE.height + 1):
            self.draw_block(0, y * game.CELL_SIZE.height, "gray")
            self.draw_block(
                bwidth - Game.CELL_SIZE.width,
                y * game.CELL_SIZE.height,
                "gray",
            )

    def draw_board_content(self):
        for x in range(Game.BOARD_SIZE.width):
            for y in range(Game.BOARD_SIZE.height):
                if self.board[y][x]:
                    self.draw_block(
                        (x + 1) * Game.CELL_SIZE.width,
                        (y + 1) * Game.CELL_SIZE.height,
                        self.board[y][x],
                    )

    def draw_current_block(self):
        start_x, start_y = self.current_block_pos
        for x in range(self.current_block.width):
            for y in range(self.current_block.height):
                if self.current_block.shape[y][x]:
                    screen_x = (start_x + x + 1) * Game.CELL_SIZE.width
                    screen_y = (start_y + y + 1) * Game.CELL_SIZE.height
                    self.draw_block(
                        screen_x, screen_y, self.current_block.color
                    )

    def frame_time(self) -> float:
        ticks = self.clock.get_time()
        if not ticks:
            return 1 / Game.FRAMERATE
        else:
            return ticks / 1000

    def handle_key_event(self, typ, key):
        if typ == pygame.KEYDOWN:
            if key in self.action_map:
                self.pending_actions.append(self.action_map[key].type)
            self.key_states[key] = True
        elif typ == pygame.KEYUP:
            self.key_states[key] = False

    def handle_events(self):
        # process already pushed keys
        for key, state in self.key_states.items():
            if (
                state
                and key in self.action_map
                and self.action_map[key].repeat
            ):
                self.pending_actions.append(self.action_map[key].type)
        # now process new events
        for event in pygame.event.get():
            match event.type:
                case pygame.QUIT:
                    self.running = False
                case pygame.KEYDOWN | pygame.KEYUP:
                    self.handle_key_event(event.type, event.key)

    def swap_with_hold(self):
        if self.did_swap:
            return
        to_swap = self.held_piece
        used_next = False
        if not to_swap:
            to_swap = self.next_piece
            used_next = True
        if not self.intersects_board(*self.current_block_pos, to_swap):
            self.held_piece = self.current_block
            self.move_piece_back_to_top()
            self.did_swap = True
            self.current_block = to_swap
            if used_next:
                self.next_piece = self.random_tetromino()

    def intersects_board(self, x: int, y: int, piece: Tetromino):
        pw, ph = piece.bounding_box_width, piece.bounding_box_height
        if x + piece.x_adj < 0 or y + piece.y_adj < 0:
            return True
        elif x + pw > Game.BOARD_SIZE.width or y + ph > Game.BOARD_SIZE.height:
            return True
        shape = piece.shape
        for cy, row in enumerate(shape):
            for cx, cell in enumerate(row):
                # some shapes jut out of the board, prevent that from crashing
                try:
                    if cell and self.board[y + cy][x + cx]:
                        return True
                except IndexError:
                    # a cell was out of bounds of the board, this is a hit!
                    return True
        return False

    def rotate_current_piece(self, times: int):
        new_piece = self.current_block.rotated(times)
        cx, cy = self.current_block_pos
        for dx in [0, 1, -1]:
            for dy in [0, 1, -1]:
                np = Cell(cx + dx, cy + dy)
                if not self.intersects_board(*np, new_piece):
                    self.current_block = new_piece
                    self.current_block_pos = np
                    self.did_user_move_or_spin = True
                    return

    def move_current_piece(self, dir: Direction):
        if self.was_move_down != dir:
            self.subcell_move = 0
            move_cell = dir
            self.was_move_down = dir
            self.inhibit_next_move = Game.MOVE_INITIAL_SLOWDOWN
        else:
            dx = dir * Game.MOVE_SPEED * self.frame_time()
            self.subcell_move += dx
            if self.inhibit_next_move > 0.0:
                oi = self.inhibit_next_move
                self.inhibit_next_move -= abs(self.subcell_move)
                if self.inhibit_next_move <= 0.0:
                    self.inhibit_next_move = 0.0
                    self.subcell_move -= oi
                else:
                    self.subcell_move = 0
            move_cell = int(self.subcell_move)
            self.subcell_move -= move_cell
        if move_cell:
            new_pos = Cell(
                self.current_block_pos.x + move_cell, self.current_block_pos.y
            )
            if not self.intersects_board(*new_pos, self.current_block):
                self.did_user_move_or_spin = True
                self.current_block_pos = new_pos
        # test if the user is moving to a valid cell and don't place if they
        # are
        else:
            move_cell = int(math.copysign(1, self.subcell_move))
            new_pos = Cell(
                self.current_block_pos.x + move_cell, self.current_block_pos.y
            )
            if not self.intersects_board(*new_pos, self.current_block):
                self.did_user_move_or_spin = True

    def process_game_actions(self):
        move_set = {Action.Type.MOVE_LEFT, Action.Type.MOVE_RIGHT} & set(
            self.pending_actions
        )
        move_both = len(move_set) == 2
        if not move_set:
            self.was_move_down = None
            self.inhibit_next_move = 0.0
            self.subcell_move = 0
        if not (
            {Action.Type.SOFT_DROP, Action.Type.HARD_DROP}
            & set(self.pending_actions)
        ):
            self.stop_drop = False
        while self.pending_actions:
            match self.pending_actions.pop(0):
                case Action.Type.ROTATE_LEFT:
                    self.rotate_current_piece(Direction.LEFT)
                case Action.Type.ROTATE_RIGHT:
                    self.rotate_current_piece(Direction.RIGHT)
                case Action.Type.SWAP_HOLD:
                    self.swap_with_hold()
                case Action.Type.SOFT_DROP if not self.stop_drop:
                    self.soft_drop = True
                case Action.Type.HARD_DROP if not self.stop_drop:
                    self.hard_drop = True
                case Action.Type.MOVE_LEFT if not move_both:
                    self.move_current_piece(Direction.LEFT)
                    self.was_move_down = Direction.LEFT
                case Action.Type.MOVE_RIGHT if not move_both:
                    self.move_current_piece(Direction.RIGHT)
                    self.was_move_down = Direction.RIGHT
                case Action.Type.RESTART:
                    self.start_new_game()
                    self.pending_actions = []

    def place_piece(self, x: int, y: int, piece: Tetromino):
        for dy, row in enumerate(piece.shape):
            for dx, cell in enumerate(row):
                if cell:
                    self.board[y + dy][x + dx] = piece.color
        # prevent user from accidentally dropping next piece too
        self.stop_drop = True
        self.subcell_drop = 0

    def cells_for_hard_drop(self):
        cx, cy = self.current_block_pos
        dy = 0
        while not self.intersects_board(cx, cy + dy, self.current_block):
            dy += 1
        return dy

    def advance_piece(self):
        speed = Game.NORMAL_DROP_SPEED
        if self.did_user_move_or_spin:
            speed = Game.MOVED_DROP_SPEED
        elif self.soft_drop:
            speed = Game.FAST_DROP_SPEED
        speed *= 1 + (Game.DROP_CLEAR_SCALE * (self.level - 1))
        self.subcell_drop += speed * self.frame_time()
        move_cell = int(self.subcell_drop)
        self.subcell_drop -= move_cell
        if self.hard_drop:
            move_cell = self.cells_for_hard_drop()
        if not move_cell:
            return
        cp = self.current_block_pos
        if not self.intersects_board(
            cp.x, cp.y + move_cell, self.current_block
        ):
            self.score += move_cell * Game.DROP_POINTS * self.level
            self.current_block_pos = Cell(cp.x, cp.y + move_cell)
        # don't place the piece if the user moved it
        elif not self.did_user_move_or_spin:
            if self.hard_drop:
                self.score += move_cell * Game.HARD_DROP_POINTS * self.level
            for dy in range(move_cell, -1, -1):
                if not self.intersects_board(
                    cp.x, cp.y + dy, self.current_block
                ):
                    self.place_piece(cp.x, cp.y + dy, self.current_block)
                    self.current_block = None
                    return
            self.game_over = True

    @staticmethod
    def generate_clear_cells():
        bw = Game.BOARD_SIZE.width
        if bw % 2 == 0:
            return zip(range(bw // 2 - 1, -1, -1), range(bw // 2, bw))
        else:
            return zip(range(bw // 2, -1, -1), range(bw // 2, bw))

    def calc_clear_speed(self):
        return Game.CLEAR_SPEED * (
            1 - (Game.DROP_CLEAR_SCALE * (self.level - 1))
        )

    def maybe_clear_rows(self):
        def do_single_clear(y: int):
            row = self.board[y]
            for x1, x2 in Game.generate_clear_cells():
                if row[x1]:
                    row[x1] = None
                    row[x2] = None
                    break

        def drop_rows_above_for_clear(y: int):
            self.board.pop(y)
            # this also restores indices for future clears
            self.board.insert(0, [None] * Game.BOARD_SIZE.width)

        if not self.clearing_rows:
            for y, row in enumerate(self.board):
                if all(row):
                    self.clearing_rows.add(y)
            if self.clearing_rows:
                self.score += (
                    Game.POINTS_PER_LINE[len(self.clearing_rows) - 1]
                    * self.level
                )
        else:
            speed = self.calc_clear_speed()
            if self.clearing_frames >= speed:
                if not any(self.board[next(iter(self.clearing_rows))]):
                    self.cleared_this_level += len(self.clearing_rows)
                    if self.cleared_this_level >= 10:
                        self.level += self.cleared_this_level // 10
                        self.cleared_this_level %= 10
                    # Order matters here
                    for y in sorted(self.clearing_rows):
                        drop_rows_above_for_clear(y)
                    self.clearing_rows = set()
                    self.clearing_frames = speed
                else:
                    for y in self.clearing_rows:
                        do_single_clear(y)
                self.clearing_frames = 0
            else:
                self.clearing_frames += 1

    def draw_score_and_instructions(self):
        text = (
            "Press <h> \nfor help\nor pause.\n"
            "\n"
            f"Level: {self.level:02}\n"
            f"Lines: {self.cleared_this_level:02}\n"
            f"Score: {self.score:05}\n"
            f"   HS: {self.high_score:05}"
        )
        exts = self.TINY_FONT.compute_extents(text)
        x = Game.CONTROLS_START_X + Game.CONTROL_DISPLAY_BORDER
        y = (
            self.screen.get_size()[1]
            - Game.CONTROL_DISPLAY_BORDER
            - exts.height
        )
        self.TINY_FONT.render_text(text, self.screen, x, y, "white")

    @lru_cache(maxsize=4)
    def get_scaled_piece(
        self, piece: Tetromino, scale: float | int, alpha: int = 255
    ) -> pygame.surface.Surface:
        ow = piece.width * Game.CELL_SIZE.width
        oh = piece.height * Game.CELL_SIZE.height
        os_surf = pygame.surface.Surface((ow, oh), pygame.SRCALPHA)
        for y, row in enumerate(piece.shape):
            for x, cell in enumerate(row):
                if cell:
                    self.draw_block(
                        x * Game.CELL_SIZE.width,
                        y * Game.CELL_SIZE.height,
                        piece.color,
                        os_surf,
                    )
        sw, sh = int(ow * scale), int(oh * scale)
        if alpha != 255:
            os_surf.set_alpha(alpha)
        return pygame.transform.scale(os_surf, (sw, sh))

    def draw_boxed_piece(
        self,
        text: str,
        piece: Tetromino | None,
        x: int,
        y: int,
        box_size: int,
    ) -> Size:
        """Return the overall bounding box."""
        text_ext = Game.TINY_FONT.compute_extents(text)
        Game.TINY_FONT.center_text(
            text,
            self.screen,
            x + box_size // 2,
            y + text_ext.height // 2,
            "white",
        )
        pygame.draw.rect(
            self.screen,
            Game.PALETTE["gray"].norm,
            (
                x,
                y + text_ext.height + Game.TINY_FONT.row_kern,
                box_size,
                box_size,
            ),
            width=Game.INFO_BOX_BORDER_SIZE,
        )
        if piece:
            piece_surf = self.get_scaled_piece(piece, 0.75)
            pw, ph = piece_surf.get_size()
            self.screen.blit(
                piece_surf,
                (
                    x + box_size // 2 - pw // 2,
                    y
                    + text_ext.height
                    + Game.TINY_FONT.row_kern
                    + box_size // 2
                    - ph // 2,
                ),
            )
        return Size(
            max(box_size, text_ext.width),
            text_ext.height + box_size + Game.TINY_FONT.row_kern,
        )

    def draw_held_and_next_piece(self):
        width = int(Game.CONTROLS_WIDTH * 0.8)
        y = Game.CONTROL_DISPLAY_BORDER
        x = Game.CONTROLS_START_X + Game.CONTROLS_WIDTH // 2 - width // 2
        exts = self.draw_boxed_piece("Hold", self.held_piece, x, y, width)
        self.draw_boxed_piece(
            "Next",
            self.next_piece,
            x,
            y + exts.height + 2 * Game.CONTROL_DISPLAY_BORDER,
            width,
        )

    def process_and_draw_help_overlay(self):
        self.draw_gray_overlay()

        hs = (
            Game.make_action_help_string(Game.GAME_ACTION_MAP)
            + "\n\n"
            + Game.make_score_help_string()
        )
        exts = Game.TINY_FONT.compute_extents(hs)

        sw, sh = self.screen.get_size()

        tot_border = Game.INFO_BOX_BORDER_SIZE + Game.HELP_MENU_INSET
        box_x = sw // 2 - exts.width // 2 - tot_border
        box_y = sh // 2 - exts.height // 2 - tot_border
        box_w = exts.width + 2 * tot_border
        box_h = exts.height + 2 * tot_border

        pygame.draw.rect(self.screen, "black", (box_x, box_y, box_w, box_h))
        pygame.draw.rect(
            self.screen,
            Game.PALETTE["gray"].norm,
            (box_x, box_y, box_w, box_h),
            width=Game.INFO_BOX_BORDER_SIZE,
        )

        Game.TINY_FONT.center_text(hs, self.screen, sw // 2, sh // 2, "white")

        if Action.Type.CLOSE_HELP in self.pending_actions:
            self.pending_actions = []
            self.action_map = Game.GAME_ACTION_MAP
            self.help_mode = False

    def draw_ghost_piece(self):
        x, y = self.current_block_pos
        y += self.cells_for_hard_drop()
        surf = self.get_scaled_piece(self.current_block, 1, 0x80)
        self.screen.blit(
            surf,
            ((x + 1) * Game.CELL_SIZE.width, y * Game.CELL_SIZE.height),
        )

    def process_clear_actions(self):
        # allow rotating the next piece during clear
        while self.pending_actions:
            match self.pending_actions.pop(0):
                case Action.Type.ROTATE_LEFT:
                    self.next_piece = self.next_piece.rotated(-1)
                case Action.Type.ROTATE_RIGHT:
                    self.next_piece = self.next_piece.rotated(1)

    def game_loop(self):
        self.soft_drop = False
        self.hard_drop = False
        self.did_user_move_or_spin = False

        self.maybe_clear_rows()
        if Action.Type.OPEN_HELP in self.pending_actions:
            # do no matter what
            self.help_mode = True
            self.action_map = Game.HELP_ACTION_MAP
        elif not self.clearing_rows:
            if not self.current_block:
                self.swap_in_next_piece()

            self.process_game_actions()
            self.advance_piece()
        else:
            self.process_clear_actions()

        self.screen.fill("black")
        self.draw_board_content()
        if self.current_block:
            self.draw_current_block()
            self.draw_ghost_piece()
        self.draw_board_border()
        self.draw_held_and_next_piece()

        self.draw_score_and_instructions()

        if self.help_mode:
            self.process_and_draw_help_overlay()

    def start_new_game(self):
        self.was_move_down = None
        self.inhibit_next_move = 0.0
        self.cur_random_peice_seq = None
        self.clear_board()
        self.next_piece = None
        self.swap_in_next_piece(True)
        self.held_piece = None
        self.did_swap = False
        self.subcell_move = 0
        self.subcell_drop = 0
        self.clearing_rows = set()
        # immediately clear the first block
        self.score = 0
        self.level = 1
        self.cleared_this_level = 0
        # depends on level
        self.clearing_frames = self.calc_clear_speed()
        self.held_piece = None
        self.game_over = False

    def handle_game_over_actions(self):
        while self.pending_actions:
            act = self.pending_actions.pop(0)
            if act == Action.Type.RESTART:
                self.start_new_game()

    def make_gray_overlay(self):
        s = pygame.surface.Surface(self.screen.get_size(), pygame.SRCALPHA)
        pygame.draw.rect(s, "#44444466", (0, 0, *s.get_size()))
        return s

    def draw_gray_overlay(self):
        self.screen.blit(self.gray_overlay, (0, 0))

    def game_over_loop(self):
        self.handle_game_over_actions()
        if not self.game_over:
            return
        self.screen.fill("black")
        self.draw_board_content()
        self.draw_current_block()
        self.draw_board_border()
        self.draw_held_and_next_piece()

        self.draw_score_and_instructions()

        self.draw_gray_overlay()

        sw, sh = self.screen.get_size()
        exts = self.FONT.compute_extents("Game Over!")
        score_text = f"Score: {self.score:05}"
        exts2 = self.SMALL_FONT.compute_extents(score_text)
        exts3 = self.SMALL_FONT.compute_extents("Press <r> to retry.")
        text_width = max(exts.width, exts2.width, exts3.width)
        text_height = (
            exts.height + exts2.height + exts3.height + 2 * self.FONT.row_kern
        )

        tot_border = Game.INFO_BOX_BORDER_SIZE + Game.HELP_MENU_INSET
        box_x = sw // 2 - text_width // 2 - tot_border
        box_y = sh // 2 - text_height // 2 - tot_border
        box_w = text_width + 2 * tot_border
        box_h = text_height + 2 * tot_border

        pygame.draw.rect(self.screen, "black", (box_x, box_y, box_w, box_h))
        pygame.draw.rect(
            self.screen,
            Game.PALETTE["gray"].norm,
            (box_x, box_y, box_w, box_h),
            width=Game.INFO_BOX_BORDER_SIZE,
        )

        self.FONT.render_text(
            "Game Over!",
            self.screen,
            sw // 2 - exts.width // 2,
            sh // 2 - text_height // 2,
            "white",
        )
        self.SMALL_FONT.render_text(
            score_text,
            self.screen,
            sw // 2 - exts2.width // 2,
            sh // 2 - text_height // 2 + exts.height + self.FONT.row_kern,
            "white",
        )
        self.SMALL_FONT.render_text(
            "Press <r> to retry.",
            self.screen,
            sw // 2 - exts3.width // 2,
            sh // 2
            - text_height // 2
            + exts.height
            + exts2.height
            + 2 * self.FONT.row_kern,
            "white",
        )

    def loop(self):
        self.running = True
        while self.running:
            self.handle_events()
            if self.game_over:
                self.game_over_loop()
            else:
                self.game_loop()

            pygame.display.flip()
            self.clock.tick(Game.FRAMERATE)

    def move_piece_back_to_top(self):
        self.current_block_pos = Cell(
            self.BOARD_SIZE.width // 2
            - math.ceil(self.current_block.bounding_box_width / 2),
            0 - self.current_block.y_adj,
        )

    def swap_in_next_piece(self, force: bool = False):
        self.did_swap = False
        if not self.next_piece or force:
            self.next_piece = self.random_tetromino()
            self.current_block = self.random_tetromino()
        else:
            self.current_block = self.next_piece
            self.next_piece = self.random_tetromino()
        self.move_piece_back_to_top()

    def clear_board(self):
        self.board = make_matrix(*Game.BOARD_SIZE)

    # not in __init__ to facilitate debugging in ipython
    def init(self):
        pygame.init()
        self.screen = pygame.display.set_mode(
            Game.WINDOW_SIZE, pygame.SCALED | pygame.HWACCEL
        )
        pygame.display.set_caption("Tetris")
        self.clock = pygame.time.Clock()

        self.gray_overlay = self.make_gray_overlay()

        pygame.key.stop_text_input()
        self.key_states = defaultdict(lambda: False)
        self.pending_actions = []
        self.stop_drop = False

        self.help_mode = False
        self.high_score = 0
        self.start_new_game()

    def run(self):
        self.init()
        self.loop()


GLYPH_DATA = [
    Font.Glyph(
        " ",
        [
            "     ",
            "     ",
            "     ",
            "     ",
            "     ",
        ],
    ),
    Font.Glyph(
        "a",
        [
            "*****",
            "*   *",
            "*****",
            "*   *",
            "*   *",
        ],
    ),
    Font.Glyph(
        "b",
        [
            "**** ",
            "*   *",
            "*****",
            "*   *",
            "**** ",
        ],
    ),
    Font.Glyph(
        "c",
        [
            "*****",
            "*   *",
            "*    ",
            "*   *",
            "*****",
        ],
    ),
    Font.Glyph(
        "d",
        [
            "**** ",
            "*   *",
            "*   *",
            "*   *",
            "**** ",
        ],
    ),
    Font.Glyph(
        "e",
        [
            "*****",
            "*    ",
            "**** ",
            "*    ",
            "*****",
        ],
    ),
    Font.Glyph(
        "f",
        [
            "*****",
            "*    ",
            "**** ",
            "*    ",
            "*    ",
        ],
    ),
    Font.Glyph(
        "g",
        [
            "*****",
            "*    ",
            "*  **",
            "*   *",
            "*****",
        ],
    ),
    Font.Glyph(
        "h",
        [
            "*   *",
            "*   *",
            "*****",
            "*   *",
            "*   *",
        ],
    ),
    Font.Glyph(
        "i",
        [
            "*****",
            "  *  ",
            "  *  ",
            "  *  ",
            "*****",
        ],
    ),
    Font.Glyph(
        "j",
        [
            "*****",
            "   * ",
            "   * ",
            "*  * ",
            " **  ",
        ],
    ),
    Font.Glyph(
        "k",
        [
            "*   *",
            "*  * ",
            "***  ",
            "*  * ",
            "*   *",
        ],
    ),
    Font.Glyph(
        "l",
        [
            "*    ",
            "*    ",
            "*    ",
            "*    ",
            "*****",
        ],
    ),
    Font.Glyph(
        "m",
        [
            "*   *",
            "** **",
            "* * *",
            "*   *",
            "*   *",
        ],
    ),
    Font.Glyph(
        "n",
        [
            "*   *",
            "**  *",
            "* * *",
            "*  **",
            "*   *",
        ],
    ),
    Font.Glyph(
        "o",
        [
            " *** ",
            "*   *",
            "*   *",
            "*   *",
            " *** ",
        ],
    ),
    Font.Glyph(
        "p",
        [
            "**** ",
            "*   *",
            "**** ",
            "*    ",
            "*    ",
        ],
    ),
    Font.Glyph(
        "q",
        [
            " *** ",
            "*   *",
            "* * *",
            "*  * ",
            " ** *",
        ],
    ),
    Font.Glyph(
        "r",
        [
            "**** ",
            "*   *",
            "**** ",
            "*  * ",
            "*   *",
        ],
    ),
    Font.Glyph(
        "s",
        [
            " ****",
            "*    ",
            " *** ",
            "    *",
            "**** ",
        ],
    ),
    Font.Glyph(
        "t",
        [
            "*****",
            "  *  ",
            "  *  ",
            "  *  ",
            "  *  ",
        ],
    ),
    Font.Glyph(
        "u",
        [
            "*   *",
            "*   *",
            "*   *",
            "*   *",
            " *** ",
        ],
    ),
    Font.Glyph(
        "v",
        [
            "*   *",
            "*   *",
            "*   *",
            " * * ",
            "  *  ",
        ],
    ),
    Font.Glyph(
        "w",
        [
            "*   *",
            "*   *",
            "* * *",
            "** **",
            "*   *",
        ],
    ),
    Font.Glyph(
        "x",
        [
            "*   *",
            " * * ",
            "  *  ",
            " * * ",
            "*   *",
        ],
    ),
    Font.Glyph(
        "y",
        [
            "*   *",
            " * * ",
            "  *  ",
            "  *  ",
            "  *  ",
        ],
    ),
    Font.Glyph(
        "z",
        [
            "*****",
            "   * ",
            "  *  ",
            " *   ",
            "*****",
        ],
    ),
    Font.Glyph(
        "0",
        [
            " *** ",
            "*   *",
            "* * *",
            "*   *",
            " *** ",
        ],
    ),
    Font.Glyph(
        "1",
        [
            " **  ",
            "* *  ",
            "  *  ",
            "  *  ",
            "*****",
        ],
    ),
    Font.Glyph(
        "2",
        [
            " *** ",
            "*   *",
            "   * ",
            "  *  ",
            " ****",
        ],
    ),
    Font.Glyph(
        "3",
        [
            " *** ",
            "*   *",
            "  ***",
            "*   *",
            " *** ",
        ],
    ),
    Font.Glyph(
        "4",
        [
            "*  * ",
            "*  * ",
            "*****",
            "   * ",
            "   * ",
        ],
    ),
    Font.Glyph(
        "5",
        [
            "*****",
            "*    ",
            "**** ",
            "    *",
            "**** ",
        ],
    ),
    Font.Glyph(
        "6",
        [
            " ****",
            "*    ",
            "**** ",
            "*   *",
            " *** ",
        ],
    ),
    Font.Glyph(
        "7",
        [
            "*****",
            "   * ",
            "  *  ",
            " *   ",
            "*    ",
        ],
    ),
    Font.Glyph(
        "8",
        [
            " *** ",
            "*   *",
            " *** ",
            "*   *",
            " *** ",
        ],
    ),
    Font.Glyph(
        "9",
        [
            " *** ",
            "*   *",
            " ****",
            "    *",
            "**** ",
        ],
    ),
    Font.Glyph(
        ".",
        [
            "  ",
            "  ",
            "  ",
            "  ",
            " *",
        ],
    ),
    Font.Glyph(
        "!",
        [
            " *",
            " *",
            " *",
            "  ",
            " *",
        ],
    ),
    Font.Glyph(
        ":",
        [
            "  ",
            " *",
            "  ",
            " *",
            "  ",
        ],
    ),
    Font.Glyph(
        "<",
        [
            "   **",
            " **  ",
            "*    ",
            " **  ",
            "   **",
        ],
    ),
    Font.Glyph(
        ">",
        [
            "**   ",
            "  ** ",
            "    *",
            "  ** ",
            "**   ",
        ],
    ),
    Font.Glyph(
        "/",
        [
            "    *",
            "   * ",
            "  *  ",
            " *   ",
            "*    ",
        ],
    ),
    Font.Glyph(
        "*",
        [
            "   ",
            "* *",
            " * ",
            "* *",
            "   ",
        ],
    ),
]


if __name__ == "__main__":
    game = Game()
    game.run()