"""「大运传统参考」: nine Mahadasha lords, three paragraphs each, both editions.

Text: `references/mahadasha_editorial_bilingual.json`, synced from the
astrologer's skill repository (yinduzhanxing 058c4f5f, 2026-11-06). Rules:
`references/mahadasha_editorial_policy.md`.

- A general reference, the three paragraphs side by side. Nothing here picks
  「有利」 or 「压力」 for this chart, and nothing says the reader is afflicted.
- Mahadasha lord layer only; no Mahadasha/Antardasha combinations.
- The source is secondary study notes; the page markers are not BPHS edition
  pages, and the report says so. The English edition shows English only.
"""

from __future__ import annotations

import json
import re
from functools import lru_cache
from pathlib import Path

_PATH = Path(__file__).resolve().parents[2] / "references" / "mahadasha_editorial_bilingual.json"
_KINDS = (
    ("general", "一般背景", "General background"),
    ("supportive_conditions", "传统有利条件下", "Under traditionally supportive conditions"),
    ("strained_conditions", "传统压力条件下", "Under traditionally strained conditions"),
)
_HAN = re.compile(r"[一-鿿]")


@lru_cache(maxsize=1)
def load_reference() -> dict:
    with _PATH.open(encoding="utf-8") as handle:
        return json.load(handle)


def _source_line(pages: list[int], language: str) -> str:
    pages_text = "、".join(str(page) for page in pages) if language == "zh" else ", ".join(str(page) for page in pages)
    if language == "zh":
        return f"来源：《BPHS 读书笔记》第 44 节，PDF 页 {pages_text}（二手资料；原典印刷版待核）。"
    return f"Source: BPHS Study Notes, section 44, PDF page {pages_text} (secondary source; original edition pending verification)."


def render_dasha_reference(language: str) -> str:
    data = load_reference()
    zh = language == "zh"
    lines = [
        "## 大运传统参考（通用）" if zh else "## Traditional Dasha Reference (general)",
        "",
        (
            "下面是九颗大运主星在传统文本里的通用主题，三段并列。哪一段更贴近这张盘，"
            "要看功能吉凶、宫主与落宫、尊贵、力量、燃烧、相照与缓解因素，本章不替这张盘做判断，也不是推算结果。"
            "只写大运主星这一层，不拼接小运。"
        ) if zh else (
            "Traditional themes for each of the nine Mahadasha lords, the three paragraphs side by side. "
            "Which one is closer to this chart depends on functional roles, house lordship and placement, dignity, "
            "strength, combustion, aspects and mitigating factors; this chapter does not decide that for the chart "
            "and is not a calculated result. It covers the Mahadasha lord only, not sub-period combinations."
        ),
        "",
    ]
    for planet in data.get("planets") or []:
        if not isinstance(planet, dict):
            continue
        name = planet.get("name_zh") if zh else planet.get("id")
        paragraphs = {item.get("kind"): item for item in planet.get("paragraphs") or [] if isinstance(item, dict)}
        if not name or not all(kind in paragraphs for kind, _zh, _en in _KINDS):
            continue
        lines.extend([f"### {name}", ""])
        pages: list[int] = []
        for kind, label_zh, label_en in _KINDS:
            item = paragraphs[kind]
            text = str(item.get("zh" if zh else "en") or "").strip()
            if not text or (not zh and _HAN.search(text)):
                continue
            lines.extend([f"**{label_zh if zh else label_en}**：{text}" if zh else f"**{label_en}**: {text}", ""])
            page = item.get("pdf_page")
            if isinstance(page, int) and page not in pages:
                pages.append(page)
        if pages:
            lines.extend([_source_line(pages, language), ""])
    return "\n".join(lines).rstrip() + "\n"


def insert_dasha_reference(markdown: str, language: str) -> str:
    """Right after the 「大运解释」 / Dasha Interpretation chapter; unchanged when it is absent."""
    if not markdown:
        return markdown
    heading = r"^## (?:大运解释|Dasha Interpretation)\s*$"
    match = re.search(heading, markdown, flags=re.MULTILINE)
    if not match:
        return markdown
    following = re.search(r"^## ", markdown[match.end():], flags=re.MULTILINE)
    cut = match.end() + following.start() if following else len(markdown)
    return markdown[:cut].rstrip() + "\n\n" + render_dasha_reference(language).rstrip() + "\n\n" + markdown[cut:].lstrip()