"""
情景对话模式：场景与话题常量及首句模板
参考：项目文档/情景对话模式设计与改造方案.md
"""
from typing import Dict, List, Tuple

# 场景键
SCENE_DEFAULT = "default"
SCENE_WINDOW = "window"   # Lumi在窗前看风景
SCENE_READING = "reading"  # Lumi在桌前看书
SCENE_EATING = "eating"    # Lumi在桌前吃饭

# 场景权重（用于加权随机）：default 70%, 三个特殊各 10%
SCENE_WEIGHTS: List[Tuple[str, int]] = [
    (SCENE_DEFAULT, 70),
    (SCENE_WINDOW, 10),
    (SCENE_READING, 10),
    (SCENE_EATING, 10),
]

# 每个特殊场景下的 3 个话题 key
SCENARIO_TOPICS: Dict[str, List[str]] = {
    SCENE_WINDOW: ["weather", "season", "travel"],
    SCENE_READING: ["reading", "hobbies", "relaxation"],
    SCENE_EATING: ["favourite_food", "hometown_food", "daily_meal"],
}

# 话题展示名 (labelEn | labelZh)，用于 greeting_context.topics
TOPIC_LABELS: Dict[str, Dict[str, str]] = {
    "weather": {"labelEn": "Weather", "labelZh": "天气"},
    "season": {"labelEn": "Season", "labelZh": "季节"},
    "travel": {"labelEn": "Travel", "labelZh": "旅行"},
    "reading": {"labelEn": "Reading", "labelZh": "阅读"},
    "hobbies": {"labelEn": "Hobbies", "labelZh": "爱好"},
    "relaxation": {"labelEn": "Relaxation", "labelZh": "放松"},
    "favourite_food": {"labelEn": "Favourite food", "labelZh": "喜欢的食物"},
    "hometown_food": {"labelEn": "Hometown food", "labelZh": "家乡的食物"},
    "daily_meal": {"labelEn": "Daily meal", "labelZh": "日常饮食"},
}

# 首句模板：{name} 替换为用户名
SPECIAL_TOPIC_FIRST_LINES: Dict[str, str] = {
    "weather": "Hi, {name}! The sky is so clear today. How is the weather at your place?",
    "season": "Hi {name}! The leaves are changing colour. It's fall. What is your favorite season?",
    "travel": "Hi, {name}! I want to go somewhere far away. Where do you want to travel?",
    "reading": "Hi, {name}! I am reading. This story is crazy! What book are you reading lately?",
    "hobbies": "Hi, {name}! I am reading. I love it! What do you do in your free time?",
    "relaxation": "Hi, {name}! I am reading. It is the only way to relax my brain. What is your way to escape?",
    "favourite_food": "Hi, {name}! I am having snacks. It's so delicious. What is your favorite food?",
    "hometown_food": "Hi, {name}! I am having snacks. It's so delicious. What is your hometown's best dish?",
    "daily_meal": "Hi, {name}! I am having snacks. It's so delicious. What you ate today?",
}


def get_special_first_line(topic_key: str, user_name: str) -> str:
    """获取特殊场景某话题的首句（已替换用户名）。"""
    user_name = (user_name or "").strip() or "Neo"
    template = SPECIAL_TOPIC_FIRST_LINES.get(topic_key)
    if not template:
        return f"Hi, {user_name}! How are you today?"
    return template.format(name=user_name)


def build_topics_payload(available_topic_keys: List[str]) -> List[Dict[str, str]]:
    """构建 greeting_context.topics 数组：[{ key, labelEn, labelZh }]。"""
    return [
        {"key": k, **TOPIC_LABELS.get(k, {"labelEn": k, "labelZh": k})}
        for k in available_topic_keys
    ]