"""Align UI encounter types to specialty Schedule listings by care setting.

Specialty **26 (Paediatrics)** and **00 (Family Practice)** use different
Consultations and Visits sections. Encounter labels map to letter-prefix
families plus BM25 steering keywords for that specialty.
"""
from __future__ import annotations

from .specialty_registry import normalize_specialty_code

# Ordered (substring -> (prefixes, keywords)) rules. First match wins — more
# specific Paediatrics phrases must precede generic ones.
_PAEDS_RULES: list[tuple[tuple[str, ...], tuple[list[str], str]]] = [
    # --- Newborn & delivery (H261 / H267 live in PAEDIATRICS (26)) ---
    (
        ("maternal delivery", "attendance at maternal", "delivery attendance"),
        (["H"], "attendance at maternal delivery H267 Paediatrics"),
    ),
    (
        ("newborn",),
        (["H"], "newborn care in hospital or home H261 Paediatrics"),
    ),
    # --- Prenatal (before hospital so "Hospital - Prenatal …" keeps A+C) ---
    # SoB PAEDIATRICS (26) lists A665 with the same-section alternatives below;
    # keep them in-scope so limited/repeat/MSA can be recommended when prenatal
    # elements are not met.
    (
        ("prenatal",),
        (
            ["A", "C"],
            "prenatal consultation A665 C665 Paediatrics "
            "limited consultation A565 repeat consultation A266 "
            "medical specific assessment A263 A264 A661 "
            "level 1 level 2 paediatric assessment A261 A262",
        ),
    ),
    # --- Long-term care (must precede generic 'complex') ---
    (
        ("long-term", "long term", "continuing care", "ltc"),
        (
            ["W"],
            "long-term care paediatric consultation subsequent visit "
            "periodic health visit",
        ),
    ),
    # --- Hospital in-patient (C-series Paediatrics mirrors) ---
    # Before developmental so "Hospital - … Neurodevelopmental" stays C.
    (
        ("subsequent", "concurrent", "daily round"),
        (
            ["C"],
            "hospital in-patient subsequent visit concurrent care "
            "medical specific re-assessment",
        ),
    ),
    (
        ("hospital", "admission", "inpatient", "in-patient", "mrp"),
        (
            ["C"],
            "hospital in-patient paediatric consultation medical specific "
            "assessment concurrent care neurodevelopmental",
        ),
    ),
    # --- Ambulatory consultations (before developmental; "neurodevelopmental
    # consultation" is an A/C/W consult listing, not K developmental care) ---
    (
        ("well-baby", "well baby", "18 month", "18-month", "enhanced 18"),
        (
            ["A"],
            "enhanced 18 month well baby visit A268 Paediatrics",
        ),
    ),
    (
        (
            "special paediatric",
            "extended special",
            "neurodevelopmental consultation",
            "special / extended",
            "consultation / limited",
            "specialist consultation",
            "consultation",
        ),
        (
            ["A"],
            "paediatric consultation limited repeat special extended "
            "neurodevelopmental A260 A265 A565 A266 A662 A667 A695",
        ),
    ),
    (
        ("medical specific", "level 2", "general assessment"),
        (
            ["A"],
            "level 2 paediatric assessment medical specific assessment "
            "re-assessment A262 A263 A264 A661",
        ),
    ),
    (
        ("level 1", "partial", "recheck", "minor"),
        (
            ["A"],
            "level 1 paediatric assessment A261",
        ),
    ),
    # --- Developmental / behavioural care (K119 / K122 / K123) ---
    # Narrow needles so "neurodevelopmental consultation" stays on A/C/W.
    (
        (
            "developmental -",
            "behavioural care",
            "behavioral care",
            "developmental care",
            "developmental assessment incentive",
            "family developmental",
            "individual developmental",
        ),
        (
            ["K", "A"],
            "paediatric developmental behavioural care K119 K122 K123 "
            "neurodevelopmental",
        ),
    ),
    # --- Interprofessional / case conference ---
    (
        (
            "case conference",
            "multi-disciplinary",
            "multidisciplinary",
            "inter-professional",
            "interprofessional",
        ),
        (
            ["K"],
            "developmental behavioural care case conference "
            "interprofessional special services",
        ),
    ),
    # --- Virtual: audio/telephone before generic "virtual" ---
    (
        ("audio", "telephone"),
        (
            ["A"],
            "office paediatric assessment consultation virtual telephone",
        ),
    ),
    (
        ("virtual", "video"),
        (["A"], "office paediatric assessment consultation virtual video"),
    ),
    (
        ("ambulatory", "office", "outpatient"),
        (
            ["A"],
            "paediatric assessment consultation well baby office ambulatory",
        ),
    ),
    # --- Emergency: Paediatrics (26) only lists newborn/delivery under H ---
    (
        ("emergency",),
        (
            ["H", "A"],
            "paediatric assessment consultation emergency urgent",
        ),
    ),
]

# Family Practice (00) — A001/A007/A003 ladder + hospital/LTC/K017.
_FP_RULES: list[tuple[tuple[str, ...], tuple[list[str], str]]] = [
    (
        ("periodic health", "annual health", "complete physical"),
        (
            ["K", "A"],
            "periodic health visit K017 Family Practice office",
        ),
    ),
    (
        ("long-term", "long term", "continuing care", "ltc", "nursing home"),
        (
            ["W"],
            "long-term care subsequent visit periodic health W001 W002 W003 "
            "W004 W109 Family Practice",
        ),
    ),
    (
        ("subsequent", "concurrent", "supportive", "daily round"),
        (
            ["C"],
            "hospital in-patient subsequent visit concurrent care supportive "
            "care C002 C007 C008 C010 Family Practice",
        ),
    ),
    (
        ("hospital", "admission", "inpatient", "in-patient", "mrp"),
        (
            ["C"],
            "hospital in-patient general assessment consultation "
            "C003 C004 C005 C006 Family Practice",
        ),
    ),
    # Intermediate before well-baby so "Intermediate assessment / well baby care"
    # steers to A007; pure enhanced-18 / well-baby labels still hit the next rule.
    (
        ("intermediate",),
        (
            ["A"],
            "intermediate assessment A007 Family Practice",
        ),
    ),
    (
        ("well-baby", "well baby", "18 month", "18-month", "enhanced 18"),
        (
            ["A"],
            "well baby care A007 enhanced 18 month well baby visit A002 "
            "Family Practice",
        ),
    ),
    # Ambulatory consult → office A only (hospital C mirrors stay on Hospital rules).
    (
        ("repeat consultation", "repeat consult"),
        (
            ["A"],
            "repeat consultation A006 Family Practice office",
        ),
    ),
    (
        ("consultation", "consult"),
        (
            ["A"],
            "consultation repeat consultation A006 Family Practice office",
        ),
    ),
    (
        ("general assessment", "complete assessment", "comprehensive"),
        (
            ["A"],
            "general assessment A003 Family Practice",
        ),
    ),
    (
        ("re-assessment", "reassessment", "general re"),
        (
            ["A"],
            "general re-assessment A004 Family Practice",
        ),
    ),
    (
        ("mini",),
        (
            ["A"],
            "mini assessment A008 Family Practice",
        ),
    ),
    (
        ("minor", "brief", "focused", "single complaint"),
        (
            ["A"],
            "minor assessment A001 Family Practice",
        ),
    ),
    (
        ("audio", "telephone", "virtual", "video"),
        (
            ["A"],
            "office assessment Family Practice virtual visit A001 A007 A003",
        ),
    ),
    (
        ("ambulatory", "office", "outpatient", "clinic"),
        (
            ["A"],
            "office assessment Family Practice A001 A007 A003 A004 A008",
        ),
    ),
    (
        ("emergency", "urgent"),
        (
            ["A", "H"],
            "office assessment urgent Family Practice A001 A007",
        ),
    ),
]


def align_encounter(
    encounter_type: str | None,
    specialty_code: str | None = None,
) -> tuple[list[str], str]:
    """Return (preferred code prefixes, specialty steering keywords)."""
    if not encounter_type:
        return [], ""
    et = encounter_type.lower()
    code = normalize_specialty_code(specialty_code)
    rules = _FP_RULES if code == "00" else _PAEDS_RULES
    for needles, result in rules:
        if any(n in et for n in needles):
            return list(result[0]), result[1]
    return [], ""


def prefix_filter(prefixes: list[str]) -> list[dict]:
    """OpenSearch filter clause restricting billing_code to the given prefixes."""
    if not prefixes:
        return []
    return [
        {
            "bool": {
                "should": [{"prefix": {"billing_code": p}} for p in prefixes],
                "minimum_should_match": 1,
            }
        }
    ]