engine.py

import libtcodpy as libtcod
from input_handlers import handle_keys, handle_mouse
from entity import get_blocking_entities_at_location

from render_functions import clear_all, render_all
from fov_functions import initialize_fov, recompute_fov
from game_messages import Message
from game_states import GameStates

from death_functions import kill_monster, kill_player
from loader_functions.initialize_new_game import get_constants, get_game_variables

def main():
    constants = get_constants()

    libtcod.console_set_custom_font('arial10x10.png', libtcod.FONT_TYPE_GREYSCALE | libtcod.FONT_LAYOUT_TCOD)

    libtcod.console_init_root(constants['screen_width'], constants['screen_height'], constants['window_title'], False)

    con = libtcod.console_new(constants['screen_width'], constants['screen_height'])
    panel = libtcod.console_new(constants['screen_width'], constants['panel_height'])

    player, entities, game_map, message_log, game_state = get_game_variables(constants)

    fov_recompute = True
    fov_map = initialize_fov(game_map)

    key = libtcod.Key()
    mouse = libtcod.Mouse()

    previous_game_state = game_state

    targeting_item = None

    while not libtcod.console_is_window_closed():
        libtcod.sys_check_for_event(libtcod.EVENT_KEY_PRESS | libtcod.EVENT_MOUSE, key, mouse)

        if fov_recompute:
            recompute_fov(fov_map, player.x, player.y, constants['fov_radius'], constants['fov_light_walls'],
                          constants['fov_algorithm'])

        render_all(con, panel, entities, player, game_map, fov_map, fov_recompute, message_log,
                   constants['screen_width'], constants['screen_height'], constants['bar_width'],
                   constants['panel_height'], constants['panel_y'], mouse, constants['colors'], game_state)
            
        fov_recompute = False

        libtcod.console_flush()
        clear_all(con, entities)

        action = handle_keys(key, game_state)
        mouse_action = handle_mouse(mouse)

        move = action.get('move')
        pickup = action.get('pickup')
        show_inventory = action.get('show_inventory')
        drop_inventory = action.get('drop_inventory')
        inventory_index = action.get('inventory_index')
        exit = action.get('exit')
        fullscreen = action.get('fullscreen')

        left_click = mouse_action.get('left_click')
        right_click = mouse_action.get('right_click')

        player_turn_results = []

        if move and game_state == GameStates.PLAYERS_TURN:
            dx, dy = move
            destination_x = player.x + dx
            destination_y = player.y + dy

            if not game_map.is_blocked(destination_x, destination_y):
                target = get_blocking_entities_at_location(entities, destination_x, destination_y)

                if target and target != player: #if move(0,0) player would attack itself
                    attack_results = player.fighter.attack(target)
                    player_turn_results.extend(attack_results)
                else:
                    player.move(dx,dy)
                    fov_recompute = True

            game_state = GameStates.ENEMY_TURN

        elif pickup and game_state == GameStates.PLAYERS_TURN:
            for entity in entities:
                if entity.item and entity.x == player.x and entity.y == player.y:
                    pickup_results = player.inventory.add_item(entity)
                    player_turn_results.extend(pickup_results)

                    break
            else:
                message_log.add_message(Message('There is nothing here to pick up.', libtcod.yellow))

        if show_inventory:
            previous_game_state = game_state
            game_state = GameStates.SHOW_INVENTORY

        if drop_inventory:
            previous_game_state = game_state
            game_state = GameStates.DROP_INVENTORY

        if inventory_index is not None and previous_game_state != GameStates.PLAYER_DEAD and inventory_index < len(
                player.inventory.items):
            item = player.inventory.items[inventory_index]

            if game_state == GameStates.SHOW_INVENTORY:
                player_turn_results.extend(player.inventory.use(item, entities=entities, fov_map=fov_map))
            elif game_state == GameStates.DROP_INVENTORY:
                player_turn_results.extend(player.inventory.drop_item(item))

        if game_state == GameStates.TARGETING:
            if left_click:
                target_x, target_y = left_click

                item_use_results = player.inventory.use(targeting_item, entities=entities, fov_map=fov_map,
                                                        target_x=target_x, target_y=target_y)
                player_turn_results.extend(item_use_results)
            elif right_click:
                player_turn_results.append({'targeting_cancelled': True})

        if exit:
            if game_state in (GameStates.SHOW_INVENTORY, GameStates.DROP_INVENTORY):
                game_state = previous_game_state
            elif game_state == GameStates.TARGETING:
                player_turn_results.append({'targeting_cancelled': True})
            else:
                return True

        if fullscreen:
            libtcod.console_set_fullscreen(not libtcod.console_is_fullscreen())

        for player_turn_result in player_turn_results:
            message = player_turn_result.get('message')
            dead_entity = player_turn_result.get('dead')
            item_added = player_turn_result.get('item_added')
            item_consumed = player_turn_result.get('consumed')
            item_dropped = player_turn_result.get('item_dropped')
            targeting = player_turn_result.get('targeting')
            targeting_cancelled = player_turn_result.get('targeting_cancelled')

            if message:
                message_log.add_message(message)

            if targeting_cancelled:
                game_state = previous_game_state

                message_log.add_message(Message('Targeting cancelled'))

            if dead_entity:
                if dead_entity == player:
                    message, game_state = kill_player(dead_entity)
                else:
                    message = kill_monster(dead_entity)

                message_log.add_message(message)

            if item_added:
                entities.remove(item_added)
                game_state = GameStates.ENEMY_TURN

            if item_consumed:
                game_state = GameStates.ENEMY_TURN
            
            if targeting:
                previous_game_state = GameStates.PLAYERS_TURN
                game_state = GameStates.TARGETING

                targeting_item = targeting

                message_log.add_message(targeting_item.item.targeting_message)

            if item_dropped:
                entities.append(item_dropped)
                game_state = GameStates.ENEMY_TURN

        if game_state == GameStates.ENEMY_TURN:
            for entity in entities:
                if entity.ai:
                    enemy_turn_results = entity.ai.take_turn(player, fov_map, game_map, entities)

                    for enemy_turn_result in enemy_turn_results:
                        message = enemy_turn_result.get('message')
                        dead_entity = enemy_turn_result.get('dead')

                        if message:
                            message_log.add_message(message)

                        if dead_entity:
                            if dead_entity == player:
                                message, game_state = kill_player(dead_entity)
                            else:
                                message = kill_monster(dead_entity)

                            message_log.add_message(message)

                            if game_state == GameStates.PLAYER_DEAD:
                                break

                    if game_state == GameStates.PLAYER_DEAD:
                        break
            else:

                game_state = GameStates.PLAYERS_TURN        

if __name__ == '__main__':
    main()