"""Public professional-reference export assembly for the Jyotish API.

This boundary performs no writing-agent, persistence, billing, or telemetry work.
It validates the public export request, reuses the handler's one full-reading
calculation, and delegates packet assembly/rendering to ``jyotish_engine``.
"""

from __future__ import annotations

import copy
from datetime import datetime
from importlib import import_module
from types import SimpleNamespace
from typing import Any

try:
    from scripts.reader_appendix_language import clean_reader_appendix_markdown
    from scripts.reader_dasha_applicability import render_dasha_applicability
    from scripts.report_density_packet import report_density_packet
except ModuleNotFoundError:  # pragma: no cover - direct scripts/ execution path
    from reader_appendix_language import clean_reader_appendix_markdown
    from reader_dasha_applicability import render_dasha_applicability
    from report_density_packet import report_density_packet


class ProfessionalReportReferenceInputError(ValueError):
    """The professional-reference request is outside the public contract."""


READER_MAIN_EDITION = "reader_main"
REFERENCE_EDITION = "reference"
REPORT_VERSION_READER = "pl9_personal_long_report.v3"


def _normalize_edition(value: Any) -> str:
    if value is None or value == "":
        return REFERENCE_EDITION
    if not isinstance(value, str):
        raise ProfessionalReportReferenceInputError("edition must be a string")
    normalized = value.strip()
    if normalized in {"", REFERENCE_EDITION, "professional_reference"}:
        return REFERENCE_EDITION
    if normalized == READER_MAIN_EDITION:
        return READER_MAIN_EDITION
    raise ProfessionalReportReferenceInputError("edition must be reference or reader_main")


def _normalize_format(value: Any) -> str:
    if value is None:
        return "json"
    if not isinstance(value, str):
        raise ProfessionalReportReferenceInputError("format must be json or markdown")
    normalized = value.strip().lower()
    if normalized not in {"json", "markdown"}:
        raise ProfessionalReportReferenceInputError("format must be json or markdown")
    return normalized


def _normalize_packs(value: Any) -> list[str]:
    if value is None:
        return []
    if isinstance(value, str):
        raw_items = value.split(",")
    elif isinstance(value, list):
        if any(not isinstance(item, str) for item in value):
            raise ProfessionalReportReferenceInputError("packs must contain only strings")
        raw_items = value
    else:
        raise ProfessionalReportReferenceInputError("packs must be a string or array of strings")

    selected: list[str] = []
    seen: set[str] = set()
    for item in raw_items:
        pack_id = item.strip()
        if pack_id and pack_id not in seen:
            selected.append(pack_id)
            seen.add(pack_id)
    return selected


def _normalize_languages(value: Any) -> list[str]:
    """``languages`` is optional; only ``zh`` and ``en`` exist. Absent means today's zh-only reply."""
    if value is None:
        return []
    if not isinstance(value, list) or any(not isinstance(item, str) for item in value):
        raise ProfessionalReportReferenceInputError("languages must be an array of strings")
    selected = []
    for item in value:
        language = item.strip().lower()
        if language not in {"zh", "en"}:
            raise ProfessionalReportReferenceInputError("languages may contain only zh and en")
        if language not in selected:
            selected.append(language)
    return selected


def _english_edition(packet: dict, include_fact_tables: bool) -> dict[str, Any]:
    """Render the English reader from a deep copy of the same packet.

    The English edition is secondary: any failure, or any Chinese character left
    in it, drops it and reports why. The Chinese edition is never touched.
    """
    try:
        from scripts.pl9_reader_english import HAN, _public_wording_en
        from scripts.pl9_reader_export import _pl9_export_markdown_for_edition
    except ModuleNotFoundError:  # pragma: no cover - direct scripts/ execution path
        from pl9_reader_english import HAN, _public_wording_en
        from pl9_reader_export import _pl9_export_markdown_for_edition
    try:
        english = copy.deepcopy(packet)
        english["report_language"] = "en"
        markdown = _pl9_export_markdown_for_edition(english, READER_MAIN_EDITION)
        applicability = (
            _public_wording_en(render_dasha_applicability(copy.deepcopy(packet), language="en"))
            if include_fact_tables else None
        )
    except Exception:  # noqa: BLE001 - the English edition must never fail the Chinese one
        return {"english_unavailable": "render_error"}
    if not isinstance(markdown, str) or not markdown.strip():
        return {"english_unavailable": "empty"}
    if HAN.search(markdown) or (applicability is not None and HAN.search(applicability)):
        return {"english_unavailable": "han_leak"}
    return {
        "markdown_en": markdown,
        **({"reader_dasha_applicability_en": applicability} if applicability is not None else {}),
    }


def _load_engine():
    try:
        return import_module("scripts.jyotish_engine")
    except ModuleNotFoundError:  # pragma: no cover - direct scripts/ execution path
        return import_module("jyotish_engine")


def _export_args(birth: dict[str, Any]) -> SimpleNamespace:
    today = birth.get("today") or datetime.now().strftime("%Y-%m-%d")
    raw_target = birth.get("target_year")
    if raw_target in (None, ""):
        target_year = int(str(today)[:4])
    else:
        target_year = int(raw_target)
    raw_age = birth.get("age")
    if raw_age in (None, ""):
        try:
            age = int(target_year) - int(birth["year"])
        except (TypeError, ValueError, KeyError):
            age = None
    else:
        age = int(raw_age)
    payload = {
        **birth,
        "hour": int(birth["hour"]),
        "minute": int(birth["minute"]),
        "second": int(birth.get("second", 0) or 0),
        "today": today,
        "target_year": target_year,
        "age": age,
        "visual_chart_observations": birth.get("visual_chart_observations"),
        "startrack_language_bridge": bool(birth.get("startrack_language_bridge")),
    }
    return SimpleNamespace(**payload)


def build_professional_report_reference(handler, body: dict[str, Any], *, engine=None) -> dict[str, Any]:
    """Build one JSON or Markdown response from one reused full-reading result."""
    if not isinstance(body, dict):
        raise ProfessionalReportReferenceInputError("request body must be an object")
    output_format = _normalize_format(body.get("format"))
    edition = _normalize_edition(body.get("edition"))
    packs = _normalize_packs(body.get("packs"))
    languages = _normalize_languages(body.get("languages"))
    if languages and (output_format != "markdown" or edition != READER_MAIN_EDITION):
        raise ProfessionalReportReferenceInputError("languages requires format markdown and edition reader_main")

    birth = handler._high_rigor_birth_payload(body)
    full_reading = handler._compute_full_reading_for_thematic(birth)
    resolved_engine = engine or _load_engine()
    try:
        packet = resolved_engine.build_professional_report_reference_packet(
            full_reading,
            _export_args(birth),
            packs,
        )
    except ValueError as exc:
        raise ProfessionalReportReferenceInputError(str(exc)) from exc

    if edition == READER_MAIN_EDITION and isinstance(packet, dict):
        packet = dict(packet)
        packet["report_version"] = REPORT_VERSION_READER
    if output_format == "markdown":
        if edition == READER_MAIN_EDITION:
            try:
                from scripts.pl9_reader_export import _pl9_export_markdown_for_edition
            except ModuleNotFoundError:  # pragma: no cover - direct scripts/ execution path
                from pl9_reader_export import _pl9_export_markdown_for_edition
            # English renders from its own deep copy first, so nothing the Chinese
            # renderer does to the packet can reach it (and vice versa).
            english = _english_edition(packet, body.get("include_fact_tables") is True) if "en" in languages else {}
            markdown = _pl9_export_markdown_for_edition(packet, READER_MAIN_EDITION)
        else:
            markdown = resolved_engine.render_pl9_markdown(packet)
        return {
            "format": "markdown",
            "edition": edition,
            "report_version": REPORT_VERSION_READER if edition == READER_MAIN_EDITION else packet.get("report_version"),
            "markdown": markdown,
            **({"fact_table_packet": report_density_packet(packet),
                "reader_dasha_applicability": clean_reader_appendix_markdown(render_dasha_applicability(packet))}
               if body.get("include_fact_tables") is True else {}),
            **(english if edition == READER_MAIN_EDITION and "en" in languages else {}),
        }
    return {
        "format": "json",
        "edition": edition,
        "report": packet,
    }