"""运行时目标上下文构建（纯函数，无 IO）。"""

from typing import Any

_LEVEL_LABEL: dict[str, str] = {
    "highest": "最高目标",
    "long_term": "长期目标",
    "session": "会话目标",
    "task": "任务目标",
    "action": "行动",
}


def build_goals_context(goals: list[dict[str, Any]]) -> str:
    """把活跃目标列表格式化为 system prompt 片段。

    按 priority 降序排列；空列表返回空串。
    """
    if not goals:
        return ""

    sorted_goals = sorted(goals, key=lambda g: g.get("priority", 0), reverse=True)
    lines: list[str] = ["当前活跃目标："]
    for g in sorted_goals:
        level_label = _LEVEL_LABEL.get(g.get("level", ""), g.get("level", ""))
        progress = g.get("progress", 0.0)
        bar = _progress_bar(progress)
        line = f"- [{level_label}] {g['title']}  [{bar} {int(progress * 100)}%]"
        lines.append(line)

    return "\n".join(lines)


def _progress_bar(value: float, width: int = 8) -> str:
    filled = int(value * width)
    return "■" * filled + "□" * (width - filled)