"""Boundary-condition (BC) field catalog - single source of truth.

The BC key naming had drifted across three places:
  1. the project boundary form / rule_engine  -> current_a, speed_rpm, slots, ...
  2. the fixed-param template (build_default_fixed_params)
                                             -> rated_current_a, rated_speed_rpm, ...
  3. the plan-detail display template          -> rated_* (a third set)

This module is the single source for the canonical BC field keys, their
Chinese labels, units, grouping, and the legacy/variant alias keys accepted on
read. Canonical keys match the project boundary form and rule_engine (the
data-entry and primary consumers). `aliases` keeps backward compatibility with
the template-era rated_* names and other historical variants.

All source is ASCII; Chinese labels are written as unicode escapes (project hard rule).
"""
from __future__ import annotations

from typing import Any, Dict, List

# Category labels (unicode-escaped).
_CAT_ELEC = "\u7535\u6c14"
_CAT_GEOM = "\u51e0\u4f55\u5c3a\u5bf8"
_CAT_SLOT = "\u69fd\u6781"
_CAT_MAT = "\u6750\u6599\u5c5e\u6027"
_CAT_GOAL = "\u6027\u80fd\u76ee\u6807"
_CAT_THERM = "\u70ed\u4e0e\u73af\u5883"

# Canonical BC field catalog. Order defines display order in the UI.
BC_FIELD_CATALOG: List[Dict[str, Any]] = [
    # --- Electrical ---
    {"key": "power_w", "label": "\u989d\u5b9a\u529f\u7387", "unit": "W", "category": _CAT_ELEC,
     "aliases": ["rated_power_w"]},
    {"key": "voltage_v", "label": "\u989d\u5b9a\u7535\u538b", "unit": "V", "category": _CAT_ELEC,
     "aliases": ["dc_link_voltage_v"]},
    {"key": "phase_count", "label": "\u76f8\u6570", "unit": "", "category": _CAT_ELEC,
     "aliases": []},
    {"key": "speed_rpm", "label": "\u989d\u5b9a\u8f6c\u901f", "unit": "rpm", "category": _CAT_ELEC,
     "aliases": ["rated_speed_rpm"]},
    {"key": "max_speed_rpm", "label": "\u6700\u9ad8\u8f6c\u901f", "unit": "rpm", "category": _CAT_ELEC,
     "aliases": []},
    {"key": "current_a", "label": "\u989d\u5b9a\u7535\u6d41", "unit": "A", "category": _CAT_ELEC,
     "aliases": ["rated_current_a"]},
    # --- Geometry ---
    {"key": "outer_diameter_mm", "label": "\u5916\u5f84", "unit": "mm", "category": _CAT_GEOM,
     "aliases": []},
    {"key": "max_outer_diameter_mm", "label": "\u6700\u5927\u5916\u5f84", "unit": "mm", "category": _CAT_GEOM,
     "aliases": []},
    {"key": "inner_diameter_mm", "label": "\u5185\u5f84", "unit": "mm", "category": _CAT_GEOM,
     "aliases": []},
    {"key": "axial_length_mm", "label": "\u8f74\u5411\u957f\u5ea6", "unit": "mm", "category": _CAT_GEOM,
     "aliases": []},
    # --- Slots & poles ---
    {"key": "slots", "label": "\u69fd\u6570", "unit": "", "category": _CAT_SLOT,
     "aliases": ["slot_count"]},
    {"key": "poles", "label": "\u6781\u6570", "unit": "", "category": _CAT_SLOT,
     "aliases": []},
    {"key": "pole_pairs", "label": "\u6781\u5bf9\u6570", "unit": "", "category": _CAT_SLOT,
     "aliases": []},
    # --- Material ---
    {"key": "magnet_grade", "label": "\u78c1\u94a2\u724c\u53f7", "unit": "", "category": _CAT_MAT,
     "aliases": []},
    {"key": "magnet_temp_c", "label": "\u78c1\u94a2\u6e29\u5ea6", "unit": "\xb0C", "category": _CAT_MAT,
     "aliases": []},
    # --- Performance goals ---
    {"key": "target_torque_nm", "label": "\u76ee\u6807\u8f6c\u77e9", "unit": "Nm", "category": _CAT_GOAL,
     "aliases": ["rated_torque_nm"]},
    {"key": "target_efficiency_pct", "label": "\u76ee\u6807\u6548\u7387", "unit": "%", "category": _CAT_GOAL,
     "aliases": ["efficiency_min_pct"]},
    {"key": "max_losses_w", "label": "\u6700\u5927\u635f\u8017", "unit": "W", "category": _CAT_GOAL,
     "aliases": []},
    {"key": "target_ripple_pct", "label": "\u76ee\u6807\u8109\u52a8", "unit": "%", "category": _CAT_GOAL,
     "aliases": ["max_torque_ripple_pct"]},
    {"key": "max_axial_force_n", "label": "\u6700\u5927\u8f74\u5411\u529b", "unit": "N", "category": _CAT_GOAL,
     "aliases": []},
    {"key": "weight_kg", "label": "\u76ee\u6807\u91cd\u91cf", "unit": "kg", "category": _CAT_GOAL,
     "aliases": []},
    # --- Thermal & environment ---
    {"key": "cooling_type", "label": "\u51b7\u5374\u65b9\u5f0f", "unit": "", "category": _CAT_THERM,
     "aliases": ["cooling_method"]},
    {"key": "insulation_class", "label": "\u7edd\u7f18\u7b49\u7ea7", "unit": "", "category": _CAT_THERM,
     "aliases": []},
    {"key": "duty_cycle", "label": "\u5de5\u4f5c\u5236", "unit": "", "category": _CAT_THERM,
     "aliases": []},
    {"key": "ambient_temp_c", "label": "\u73af\u5883\u6e29\u5ea6", "unit": "\xb0C", "category": _CAT_THERM,
     "aliases": []},
]


def get_bc_field_catalog() -> List[Dict[str, Any]]:
    """Return the BC field catalog as a list of dicts (for API / UI rendering).

    Each field is enriched with form-rendering metadata: `type` (number /
    int / enum) and `options` for enum fields, so the frontend can render the
    full catalog as a form without hard-coding any field list.
    """
    out = [dict(f) for f in BC_FIELD_CATALOG]
    for f in out:
        meta = _FIELD_FORM_META.get(f["key"], {"type": "number"})
        f["type"] = meta["type"]
        if meta.get("options"):
            f["options"] = list(meta["options"])
    return out


# Form-rendering metadata keyed by canonical BC key. Enum options are
# engineering-standard choices (IEC insulation classes / duty cycles, common
# NdFeB grades; Cooling_Method verified against Motor-CAD via the MARS run).
_FIELD_FORM_META: Dict[str, Dict[str, Any]] = {
    "cooling_type": {"type": "enum", "options": ["Natural", "Forced Air", "Water", "Oil"]},
    "insulation_class": {"type": "enum", "options": ["A", "E", "B", "F", "H"]},
    "duty_cycle": {"type": "enum", "options": ["S1", "S2", "S3", "S6"]},
    "magnet_grade": {"type": "enum", "options": ["N35", "N38", "N42", "N42SH", "N42UH", "N48", "N52"]},
    "phase_count": {"type": "int"},
    "slots": {"type": "int"},
    "poles": {"type": "int"},
    "pole_pairs": {"type": "int"},
}


def _alias_to_canonical() -> Dict[str, str]:
    """Build alias -> canonical key lookup from the catalog."""
    m: Dict[str, str] = {}
    for f in BC_FIELD_CATALOG:
        for a in f.get("aliases", []):
            m[a] = f["key"]
    return m


def normalize_bc(data: Dict[str, Any]) -> Dict[str, Any]:
    """Normalize a boundary-conditions dict to canonical keys.

    Alias keys are mapped to their canonical key; a canonical key already
    present always wins over its aliases. Unknown keys are passed through
    unchanged so forward-compatible extras are preserved. Returns a new dict
    (the input is not mutated).
    """
    if not data:
        return {}
    amap = _alias_to_canonical()
    out: Dict[str, Any] = {}
    for k, v in data.items():
        canon = amap.get(k, k)
        # Canonical already set (explicitly or by an earlier alias): keep the
        # first non-empty value, preferring an explicit canonical entry.
        if canon in out and out[canon] not in (None, ""):
            if k == canon and v not in (None, ""):
                out[canon] = v  # explicit canonical overrides alias-filled
            continue
        out[canon] = v
    return out