"""GIAS code -> name dictionaries.

GENERATED by pipeline/scripts/generate_gias_codes.py from the GIAS bulk CSV
— do not edit by hand; rerun the script when the dbt drift test warns.
The canonical file is backend/gias_codes.py; pipeline/scripts/gias_codes.py
must be byte-identical (enforced by backend/tests/test_gias_codes.py).
"""

from __future__ import annotations

import logging
import math

logger = logging.getLogger(__name__)


SCHOOL_TYPE: dict[int, str] = {
    1: "Community school",
    2: "Voluntary aided school",
    3: "Voluntary controlled school",
    5: "Foundation school",
    6: "City technology college",
    7: "Community special school",
    8: "Non-maintained special school",
    10: "Other independent special school",
    11: "Other independent school",
    12: "Foundation special school",
    14: "Pupil referral unit",
    15: "Local authority nursery school",
    18: "Further education",
    24: "Secure units",
    25: "Offshore schools",
    26: "Service children's education",
    27: "Miscellaneous",
    28: "Academy sponsor led",
    29: "Higher education institutions",
    30: "Welsh establishment",
    31: "Sixth form centres",
    32: "Special post 16 institution",
    33: "Academy special sponsor led",
    34: "Academy converter",
    35: "Free schools",
    36: "Free schools special",
    37: "British schools overseas",
    38: "Free schools alternative provision",
    39: "Free schools 16 to 19",
    40: "University technical college",
    41: "Studio schools",
    42: "Academy alternative provision converter",
    43: "Academy alternative provision sponsor led",
    44: "Academy special converter",
    45: "Academy 16-19 converter",
    46: "Academy 16 to 19 sponsor led",
    49: "Online provider",
    56: "Institution funded by other government department",
    57: "Academy secure 16 to 19",
}

ESTABLISHMENT_STATUS: dict[int, str] = {
    1: "Open",
    2: "Closed",
    3: "Open, but proposed to close",
    4: "Proposed to open",
}

PHASE_OF_EDUCATION: dict[int, str] = {
    0: "Not applicable",
    1: "Nursery",
    2: "Primary",
    3: "Middle deemed primary",
    4: "Secondary",
    5: "Middle deemed secondary",
    6: "16 plus",
    7: "All-through",
}

OFFICIAL_SIXTH_FORM: dict[int, str] = {
    0: "Not applicable",
    1: "Has a sixth form",
    2: "Does not have a sixth form",
    9: "",
}

RELIGIOUS_CHARACTER: dict[int, str] = {
    0: "Does not apply",
    2: "Church of England",
    3: "Roman Catholic",
    4: "Methodist",
    5: "Jewish",
    6: "None",
    7: "Muslim",
    8: "Seventh Day Adventist",
    9: "Church of England/Methodist",
    10: "Methodist/Church of England",
    11: "Church of England/Roman Catholic",
    12: "Church of England/United Reformed Church",
    13: "Roman Catholic/Church of England",
    14: "Quaker",
    15: "Christian",
    16: "United Reformed Church",
    17: "Congregational Church",
    18: "Free Church",
    19: "Church of England/Free Church",
    20: "Church of England/Christian",
    21: "Sikh",
    22: "Greek Orthodox",
    24: "Buddhist",
    25: "Hindu",
    26: "Moravian",
    28: "Inter- / non- denominational",
    29: "Multi-faith",
    30: "Church of England/Methodist/United Reform Church/Baptist",
    31: "Anglican",
    32: "Anglican/Christian",
    33: "Anglican/Evangelical",
    34: "Anglican/Church of England",
    35: "Catholic",
    36: "Charadi Jewish",
    37: "Christian/Evangelical",
    38: "Christian Science",
    39: "Christian/Methodist",
    40: "Christian/non-denominational",
    41: "Church of England/Evangelical",
    42: "Islam",
    43: "Orthodox Jewish",
    44: "Plymouth Brethren Christian Church",
    45: "Protestant",
    46: "Protestant/Evangelical",
    47: "Reformed Baptist",
    48: "Roman Catholic/Anglican",
    49: "Sunni Deobandi",
    99: "",
}

ADMISSIONS_POLICY: dict[int, str] = {
    0: "Not applicable",
    2: "Selective",
    4: "Non-selective",
    9: "",
}


def translate(code, mapping: dict[int, str]) -> str | None:
    """Translate a GIAS code to its display name.

    None/NaN -> None (column absent or suppressed). Unknown codes degrade to
    "Unknown (<code>)" with a warning so a new DfE value never blanks the UI.
    """
    if code is None or (isinstance(code, float) and math.isnan(code)):
        return None
    code = int(code)
    if code not in mapping:
        logger.warning("Unknown GIAS code %s (not in dictionary)", code)
        return f"Unknown ({code})"
    return mapping[code]