#!/usr/bin/env python3
"""Markdown chapter for the seven report-only rashi dashas."""

from __future__ import annotations

from typing import Mapping

try:
    from rashi_dashas_native import calculate_rashi_dashas
except ImportError:  # pragma: no cover - package import
    from scripts.rashi_dashas_native import calculate_rashi_dashas

_SIGN_CN = {
    "Aries": "白羊座",
    "Taurus": "金牛座",
    "Gemini": "双子座",
    "Cancer": "巨蟹座",
    "Leo": "狮子座",
    "Virgo": "处女座",
    "Libra": "天秤座",
    "Scorpio": "天蝎座",
    "Sagittarius": "射手座",
    "Capricorn": "摩羯座",
    "Aquarius": "水瓶座",
    "Pisces": "双鱼座",
}
# Chinese headings avoid the token Dasha. The report cleaner turns that token
# into 大运 and then deletes the linebreak before the next Chinese sentence.
_ORDER = (
    ("sthira", "Sthira", "Sthira Dasha"),
    ("niryaana_shoola", "Niryaana Shoola", "Niryaana Shoola Dasha"),
    ("drig", "Drig", "Drig Dasha"),
    ("navamsha", "Navamsha", "Navamsha Dasha"),
    ("shoola", "Shoola", "Shoola Dasha"),
    ("chara", "Chara", "Chara Dasha"),
    ("lagna_kendradi", "Lagna Kendradi", "Lagna Kendradi Rashi Dasha"),
)
_CLASSICAL = ("Sun", "Moon", "Mars", "Mercury", "Jupiter", "Venus", "Saturn")


def _language(packet: Mapping) -> str:
    raw = packet.get("report_language") or packet.get("language") or "zh"
    return "en" if str(raw).lower().startswith("en") else "zh"


def _longitude(row: Mapping) -> float | None:
    # Ascendant "degree" is the degree inside the sign. Full longitude is degree_raw / lon.
    for key in ("degree_raw", "lon", "longitude"):
        value = row.get(key)
        if isinstance(value, (int, float)):
            return float(value)
    sign = row.get("sign")
    degree = row.get("degree_in_sign")
    if sign in _SIGN_CN and isinstance(degree, (int, float)):
        signs = list(_SIGN_CN)
        return signs.index(str(sign)) * 30.0 + float(degree)
    return None


def _birth_date(packet: Mapping) -> str | None:
    birth = packet.get("birth_info")
    if not isinstance(birth, Mapping):
        return None
    if birth.get("date"):
        return str(birth.get("date"))
    year, month, day = birth.get("year"), birth.get("month"), birth.get("day")
    if all(isinstance(part, int) for part in (year, month, day)):
        return f"{int(year):04d}-{int(month):02d}-{int(day):02d}"
    return None


def chart_inputs(packet: Mapping) -> dict | None:
    core = packet.get("core_chart")
    if not isinstance(core, Mapping):
        return None
    asc = core.get("ascendant")
    planets = core.get("planets")
    if not isinstance(asc, Mapping) or not isinstance(planets, Mapping):
        return None
    asc_lon = _longitude(asc)
    birth = _birth_date(packet)
    if asc_lon is None or not birth:
        return None
    longitudes = {}
    for name in list(_CLASSICAL) + ["Rahu", "Ketu"]:
        row = planets.get(name)
        if isinstance(row, Mapping):
            value = _longitude(row)
            if value is not None:
                longitudes[name] = value
    if any(name not in longitudes for name in _CLASSICAL):
        return None
    return {"birth": birth, "ascendant_longitude": asc_lon, "planet_lons": longitudes}


def _sign_label(sign: str, language: str) -> str:
    if language == "zh":
        return _SIGN_CN.get(sign, sign)
    return sign


def _method_line(section: Mapping, language: str) -> str:
    if section.get("status") != "listed":
        return str(section.get("reason_en") if language == "en" else section.get("reason_zh") or "")
    profile = section.get("profile_id") or ""
    if language == "en":
        return (
            f"Method used on this site: {profile}, source: {section.get('source_en')}; "
            "not checked one-by-one against external software."
        )
    return f"本站选用的方法：{profile}，出处：{section.get('source_zh')}；未与外部软件逐一核对。"


def render_rashi_dasha_chapter(packet: Mapping) -> str:
    """Return the chapter, or an empty string when the packet has no longitudes."""
    inputs = chart_inputs(packet)
    if inputs is None:
        return ""
    language = _language(packet)
    sections = calculate_rashi_dashas(inputs["birth"], inputs["ascendant_longitude"], inputs["planet_lons"])
    if language == "en":
        lines = [
            "## Sign dashas calculated on this site",
            "",
            "These tables list signs and dates only.",
            "",
        ]
        sign_header = "| Index | Sign | Start | End | Years |"
        child_header = "| Index | Maha | Antara | Start | End |"
    else:
        lines = [
            "## 星座大运（本站计算）",
            "",
            "以下只列出星座和日期。",
            "",
        ]
        sign_header = "| 序号 | 星座 | 起始 | 结束 | 年数 |"
        child_header = "| 序号 | 主运 | 子运 | 起始 | 结束 |"
    for key, title_zh, title_en in _ORDER:
        section = sections[key]
        title = title_en if language == "en" else title_zh
        lines.extend([f"### {title}", "", _method_line(section, language), ""])
        if key == "chara" and section.get("status") == "listed":
            lines.extend([
                "This section is the K.N. Rao Chara table. It is not the Narayana table."
                if language == "en"
                else "这一节是 K.N. Rao 的 Chara 表，不是 Narayana 表。",
                "",
            ])
        periods = section.get("periods") or []
        if not periods:
            continue
        lines.extend([sign_header, "|------|------|------|------|------|"])
        child_rows = []
        for index, period in enumerate(periods, start=1):
            label = _sign_label(str(period.get("sign")), language)
            lines.append(
                f"| {index} | {label} | {period.get('start')} | {period.get('end')} | {period.get('years')} |"
            )
            for child in period.get("antardasha") or []:
                child_rows.append((label, _sign_label(str(child.get("sign")), language), child.get("start"), child.get("end")))
        lines.append("")
        if child_rows:
            lines.extend([child_header, "|------|------|------|------|------|"])
            for index, (parent, child, start, end) in enumerate(child_rows, start=1):
                lines.append(f"| {index} | {parent} | {child} | {start} | {end} |")
            lines.append("")
    return "\n".join(lines).rstrip() + "\n"