engine.py

"""ゲームエンジン。状態・ターン処理・描写を統合する中核。"""
from __future__ import annotations

import colors
from exceptions import GameOver, Impossible
from fov import compute_fov
import entity_factory
import render_functions
from input_handlers import (
    CharacterScreenHandler, EventHandler, InventoryActivateHandler,
    InventoryDropHandler, MainGameEventHandler, QuitConfirmationHandler,
)
from map_gen import generate_dungeon
from message_log import MessageLog


class Engine:
    """全ゲーム状態とターン処理の中央管理。"""

    def __init__(self, player):
        self.player = player
        self.game_map = None
        self.message_log = MessageLog()
        self.event_handler: EventHandler = MainGameEventHandler()
        self.fov_radius = 8

        # 画面レイアウト
        self.screen_width = 80
        self.screen_height = 24
        self.map_height = 17  # メッセージ領域 = screen_height - map_height - 1(HUD)

        # ダンジョン生成パラメータ
        self.max_rooms = 30
        self.room_min_size = 6
        self.room_max_size = 10

    # ────────────────────────── 視界 ──────────────────────────

    def update_fov(self) -> None:
        compute_fov(self.game_map, self.player.x, self.player.y, self.fov_radius)

    # ────────────────────────── ターン処理 ──────────────────────────

    def handle_enemy_turns(self) -> None:
        """プレイヤー以外の全アクターを1ターン行動させる。"""
        for entity in list(self.game_map.entities):
            if entity.is_alive and entity is not self.player:
                try:
                    entity.ai.perform(self)
                except Impossible:
                    pass

    def handle_player_input(self, key: int) -> None:
        """プレイヤーのキー入力を処理し、成功すれば敵ターンへ進む。"""
        result = self.event_handler.handle_key(key, self)
        if result is None:
            return  # 無効キー: ターン消費なし

        # 状態遷移（メニュー等）
        if isinstance(result, EventHandler):
            self.event_handler = result
            return

        # 行動の実行
        action = result
        self.event_handler = MainGameEventHandler()
        try:
            action.perform(self)
        except Impossible as exc:
            self.message_log.add_text(str(exc), colors.UI_WARN)
            return

        # 行動成功 → 敵のターン → 視界更新（GameOver は呼び出し元へ伝播）
        self.handle_enemy_turns()
        self.update_fov()

    # ────────────────────────── 階層移動 ──────────────────────────

    def descend(self) -> None:
        """階段を下りて次の階層へ。"""
        new_level = self.game_map.dungeon_level + 1
        self._enter_floor(new_level)
        self.message_log.add_text(f"第{new_level}階層に降りた。", colors.UI_WARN)

    def _enter_floor(self, level: int) -> None:
        new_map = generate_dungeon(
            max_rooms=self.max_rooms,
            room_min_size=self.room_min_size,
            room_max_size=self.room_max_size,
            map_width=self.screen_width,
            map_height=self.map_height,
            dungeon_level=level,
        )
        self.game_map = new_map
        self.player.place(*new_map.first_room_center, gamemap=new_map)
        entity_factory.place_entities(new_map, level)
        self.update_fov()

    # ────────────────────────── 死亡処理 ──────────────────────────

    def check_and_handle_death(self, entity) -> None:
        """エンティティのHPを確認し、0以下で死亡処理。"""
        fighter = getattr(entity, "fighter", None)
        if fighter and fighter.hp <= 0 and not getattr(entity, "_dead", False):
            self._kill_entity(entity)

    def _kill_entity(self, entity) -> None:
        was_player = entity is self.player
        xp = entity.level.xp_given if getattr(entity, "level", None) else 0
        original_name = entity.name

        # 死亡処理（フラグで再入を防ぐ）
        entity._dead = True

        # 死体に変える
        entity.char = "%"
        entity.color = colors.UI_DIM
        entity.blocks_movement = False
        entity.render_order = 0
        entity.name = f"{original_name}の死体"
        entity.ai = None

        if was_player:
            raise GameOver(victory=False)

        self.message_log.add_text(f"{original_name}を倒した!", colors.UI_GOOD)
        # プレイヤーに経験値
        if self.player.level and xp > 0:
            self.player.level.add_xp(xp)
            while self.player.level.requires_level_up:
                self.player.level.level_up()
                self.message_log.add_text(
                    f"レベル{self.player.level.current_level}になった! "
                    f"身体能力が向上した。",
                    colors.UI_TITLE)

    # ────────────────────────── 描写 ──────────────────────────

    def render(self, stdscr) -> None:
        stdscr.erase()
        if isinstance(self.event_handler, (InventoryActivateHandler, InventoryDropHandler)):
            render_functions.render_inventory_menu(stdscr, self, self.event_handler.title)
            stdscr.refresh()
            return
        if isinstance(self.event_handler, CharacterScreenHandler):
            render_functions.render_character_screen(stdscr, self)
            stdscr.refresh()
            return
        render_functions.render_map(stdscr, self)
        render_functions.render_hud(stdscr, self)
        render_functions.render_messages(stdscr, self)
        if isinstance(self.event_handler, QuitConfirmationHandler):
            render_functions.render_quit_confirmation(stdscr, self)
        stdscr.refresh()