"""
Default junior-high math knowledge catalog（与 frontend/src/data/knowledgeCatalog.ts 保持一致，用于一键同步到 Neo4j）。
结构: { 年级: { 类别: [ { code, name }, ... ] } }
"""

from __future__ import annotations

from typing import TypedDict


class TopicItem(TypedDict):
    code: str
    name: str


DEFAULT_KNOWLEDGE_CATALOG: dict[str, dict[str, list[TopicItem]]] = {
    "七年级": {
        "代数与方程": [
            {"code": "J7-EQ-001", "name": "一元一次方程"},
            {"code": "J7-EQ-002", "name": "二元一次方程组"},
        ],
        "几何基础": [
            {"code": "J7-GEO-001", "name": "线段与角"},
            {"code": "J7-GEO-002", "name": "相交线与平行线"},
        ],
    },
    "八年级": {
        "代数与函数": [
            {"code": "J8-FUNC-001", "name": "一次函数"},
            {"code": "J8-ROOT-001", "name": "二次根式"},
        ],
        "几何证明": [
            {"code": "J8-GEO-001", "name": "全等三角形"},
            {"code": "J8-GEO-002", "name": "轴对称"},
        ],
    },
    "九年级": {
        "代数进阶": [
            {"code": "J9-EQ-001", "name": "一元二次方程"},
            {"code": "J9-FUNC-001", "name": "二次函数"},
        ],
        "圆与统计": [
            {"code": "J9-CIRCLE-001", "name": "圆的基本性质"},
            {"code": "J9-STAT-001", "name": "概率初步"},
        ],
    },
}


def iter_catalog_topics() -> list[tuple[str, str, str, str]]:
    """遍历目录，返回 (年级, 类别, 编码, 名称) 列表。"""
    out: list[tuple[str, str, str, str]] = []
    for grade, categories in DEFAULT_KNOWLEDGE_CATALOG.items():
        for category, topics in categories.items():
            for t in topics:
                out.append((grade, category, t["code"], t["name"]))
    return out