"""主题检测与聚类。"""

from __future__ import annotations

from collections import defaultdict
from typing import Any

THEME_RULES: list[tuple[str, str, list[str]]] = [
    ("🎬", "AI 多媒体 / 视频", ["runcomfy", "remotion", "video", "seedance", "inpaint", "lipsync"]),
    ("🔧", "工程协作 / Skill 元能力", ["grill", "tdd", "architecture", "find-skills", "to-issues"]),
    ("📱", "飞书 / Lark", ["lark", "feishu"]),
    ("📣", "内容营销", ["viral", "tiktok", "instagram", "reels"]),
    ("🎨", "设计 / 前端", ["frontend", "design", "ui-ux", "tailwind"]),
]


def detect_theme_line(feed: dict[str, Any]) -> str:
    scores: dict[str, int] = defaultdict(int)
    for board in ("topTrending", "topHot"):
        for rank, item in enumerate(feed.get(board, [])[:10], 1):
            haystack = " ".join(
                [item.get("title", ""), item.get("source", ""), item.get("description", "")]
            ).lower()
            for _icon, label, keywords in THEME_RULES:
                if any(k in haystack for k in keywords):
                    scores[label] += max(1, 11 - rank)
                    break
    if not scores:
        return "**今日主题**：Agent Skills 生态持续活跃"
    return f"**今日主题**：{max(scores.items(), key=lambda x: x[1])[0]}"


def theme_clusters(feed: dict[str, Any], limit: int = 5) -> list[tuple[str, list[str]]]:
    from daily.pipeline.snapshot import skill_id

    buckets: dict[str, list[str]] = defaultdict(list)
    seen: set[str] = set()
    for board in ("topTrending", "topHot"):
        for item in feed.get(board, [])[:20]:
            item_id = skill_id(item)
            if item_id in seen:
                continue
            seen.add(item_id)
            haystack = " ".join(
                [item.get("title", ""), item.get("source", ""), item.get("description", "")]
            ).lower()
            for _icon, theme, keywords in THEME_RULES:
                if any(k in haystack for k in keywords):
                    label = f"**{item.get('title')}** (`{item.get('source')}`)"
                    if label not in buckets[theme]:
                        buckets[theme].append(label)
                    break
    return [(theme, examples[:limit]) for theme, examples in buckets.items() if examples]