from __future__ import annotations

from .paths import CHAR_PATH, WORLD_PATH
from .prompts import SYSTEM_PROMPT
from . import state


def build_system_prompt() -> str:
    """Assemble the system prompt with current game state."""
    char = state.read_file(CHAR_PATH) or "*No character sheet.*"
    world = state.truncate_world(state.read_file(WORLD_PATH) or "") or "*No world state.*"
    log = state.read_recent_log()
    story = state.read_recent_book()
    return SYSTEM_PROMPT.substitute(
        character=char, world=world, log=log, story=story
    )