"""Extraction des résultats biologiques depuis le texte médical."""

from __future__ import annotations

import re
import unicodedata
import logging

import numpy as np
from ..config import BiologieCle, DossierMedical, load_lab_value_sanity
from .bio_normals import BIO_NORMALS, _is_abnormal

logger = logging.getLogger(__name__)


def _norm_key(s: str) -> str:
    """Normalise une clé (minuscules, sans accents) pour index YAML."""
    s = (s or "").strip().lower()
    s = unicodedata.normalize("NFKD", s)
    s = "".join(ch for ch in s if not unicodedata.combining(ch))
    return re.sub(r"\s+", " ", s)


def _parse_float_and_token(raw: str) -> tuple[float | None, str | None]:
    """Parse un float et renvoie aussi le token numérique normalisé (avec '.')."""
    if raw is None:
        return None, None
    s = str(raw).strip()
    m = re.search(r"(-?\d+(?:[\.,]\d+)?)", s)
    if not m:
        return None, None
    token = m.group(1).replace(",", ".")
    try:
        return float(token), token
    except ValueError:
        return None, None


def _sanitize_bio_value(test_name: str, raw_value: str, sanity_cfg: dict) -> tuple[str, float, str, str | None] | None:
    """Applique des garde-fous anti-artefacts (OCR/PDF).

    Retour:
        (token, value_float, quality, reason) ou None si non parsable.
        quality: ok | suspect | discarded
    """
    val, token = _parse_float_and_token(raw_value)
    if val is None or token is None:
        return None

    key = _norm_key(test_name)
    tests_cfg = (sanity_cfg or {}).get("tests") or {}
    cfg = tests_cfg.get(key) or {}
    hard_min = cfg.get("hard_min")
    hard_max = cfg.get("hard_max")

    if hard_min is not None and val < float(hard_min):
        return token, val, "discarded", f"Valeur hors bornes plausibles (<{hard_min})"
    if hard_max is not None and val > float(hard_max):
        return token, val, "discarded", f"Valeur hors bornes plausibles (>{hard_max})"

    quality = "ok"
    reason: str | None = None

    suspect_cfg = cfg.get("suspect") or {}
    single_digit_over = suspect_cfg.get("single_digit_over")
    if single_digit_over is not None:
        # Ex: potassium '8' au lieu de '4.8' (décimale perdue)
        if re.fullmatch(r"\d", str(raw_value).strip()) and val >= float(single_digit_over):
            quality = "suspect"
            reason = f"Valeur à 1 chiffre (possible décimale perdue) : vérifier dans le CR"

    return token, val, quality, reason


def _extract_biologie_faiss(text: str, dossier: DossierMedical) -> None:
    """Extraction biologique via recherche vectorielle FAISS pour les synonymes.
    
    Complète les regex pour les termes non prévus ou les variations complexes.
    """
    from .rag_index import get_index
    from .rag_search import _get_embed_model
    
    res = get_index(kind="bio")
    if not res:
        return
    faiss_index, metadata = res
    
    try:
        model = _get_embed_model()
    except Exception as e:
        logger.warning("FAISS Bio: modèle d'embedding indisponible (%s)", e)
        return

    # 1. Découpage du texte en segments glissants (phrases ou groupes de mots)
    lines = [l.strip() for l in text.split("\n") if len(l.strip()) > 5]
    if not lines:
        return
        
    segments = []
    for line in lines:
        if len(line.split()) > 15:
            words = line.split()
            for i in range(0, len(words), 10):
                segments.append(" ".join(words[i:i+12]))
        else:
            segments.append(line)

    if not segments:
        return

    # 2. Encodage des segments
    try:
        embeddings = model.encode(segments, normalize_embeddings=True, show_progress_bar=False)
        embeddings = np.array(embeddings, dtype=np.float32)
    except Exception as e:
        logger.warning("FAISS Bio: erreur encodage segments (%s)", e)
        return

    # 3. Recherche dans l'index bio
    MIN_SCORE_BIO = 0.82
    scores, indices = faiss_index.search(embeddings, 1)
    
    sanity_cfg = load_lab_value_sanity()
    seen_faiss = set()

    for i, (score, idx) in enumerate(zip(scores, indices)):
        s = float(score[0])
        if s < MIN_SCORE_BIO or idx[0] < 0:
            continue
            
        meta = metadata[idx[0]]
        concept_name = meta.get("code")
        synonym_matched = meta.get("extrait")
        segment = segments[i]
        
        # 4. Capture de la valeur numérique
        val_match = re.search(r"(?:[=àa:]\s*)?(\d+(?:[.,]\d+)?)\s*(?:[a-zA-Z/%/µ/mm3/G/L/U/I]+)?", segment)
        if not val_match:
            continue
            
        raw_value = val_match.group(1)
        entry_key = (concept_name, raw_value)
        if entry_key in seen_faiss:
            continue
        seen_faiss.add(entry_key)
        
        sanitized = _sanitize_bio_value(concept_name, raw_value, sanity_cfg)
        if sanitized:
            token, val_num, quality, reason = sanitized
            anomalie = _is_abnormal(concept_name, token, dossier.sejour.age if dossier.sejour else None, dossier.sejour.sexe if dossier.sejour else None)
            
            is_dup = any(b.test == concept_name and b.valeur == raw_value for b in dossier.biologie_cle)
            if is_dup:
                continue

            dossier.biologie_cle.append(
                BiologieCle(
                    test=concept_name,
                    valeur=raw_value,
                    valeur_num=val_num,
                    anomalie=anomalie,
                    quality=quality,
                    discard_reason=reason,
                )
            )
            logger.debug("FAISS Bio match: %s (%s) = %s dans '%s'", concept_name, synonym_matched, raw_value, segment)


def _extract_biologie(text: str, dossier: DossierMedical) -> None:
    """Extrait des résultats biologiques clés.

    Notes:
    - Supporte des aliases (TGO/TGP, Hb, Na/K…)
    - Capte plusieurs occurrences (utile pour valider/infirmer des diagnostics)
    - Reste volontairement *simple* (regex sur texte extrait) : si une valeur est
      uniquement dans un tableau PDF mal extrait, elle peut manquer.
    """
    # (pattern, test_name)
    bio_patterns: list[tuple[str, str]] = [
        (r"[Ll]ipas[ée]mie\s*(?:[àa=:])?\s*(\d+)\s*(?:UI/L|U/L)?", "Lipasémie"),
        (r"\bCRP\b\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:mg/[Ll])?", "CRP"),
        (r"(?:\bASAT\b|\bTGO\b)\s*[=:àa]?\s*([\d.,]+)\s*(?:N|U(?:I)?/L)?", "ASAT"),
        (r"(?:\bALAT\b|\bTGP\b)\s*[=:àa]?\s*([\d.,]+)\s*(?:N|U(?:I)?/L)?", "ALAT"),
        (r"\bGGT\b\s*[=:àa]?\s*(\d+)\s*(?:U(?:I)?/L)?", "GGT"),
        (r"\bPAL\b\s*[=:àa]?\s*(\d+)\s*(?:U(?:I)?/L)?", "PAL"),
        (r"[Bb]ilirubine\s+(?:totale\s+)?[àa=:]\s*(\d+(?:[.,]\d+)?)\s*(?:µmol/L|mg/dL)?", "Bilirubine totale"),

        # Ionogramme / électrolytes
        (r"(?:[Ss]odium|[Nn]atr[ée]mie|(?<![A-Za-z])Na\+?(?![A-Za-z]))\s*[=:àa]?\s*([0-9]{2,3}(?:[.,][0-9]+)?)\s*(?:mmol/L|mEq/L)?", "Sodium"),
        (r"(?:[Pp]otassium|[Kk]ali[ée]mie|(?<![A-Za-z])K\+?(?![A-Za-z]))\s*[=:àa]?\s*([0-9](?:[.,][0-9]+)?)\s*(?:mmol/L|mEq/L)?", "Potassium"),
        (r"(?:[Cc]hlore|[Cc]hlor[ée]mie|(?<![A-Za-z])Cl-?(?![A-Za-z]))\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:mmol/L)?", "Chlore"),
        (r"(?:[Cc]alcium|[Cc]alci[ée]mie|(?<![A-Za-z])Ca\+?(?![A-Za-z]))\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:mmol/L|mg/dL)?", "Calcium"),

        (r"[Tt]roponine\s+(?:us\s+)?(n[ée]gative|positive|normale)", "Troponine"),
        (r"(?:[Hh][ée]moglobine|\bHb\b)\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:g/dL|g/L)?", "Hémoglobine"),
        (r"\bVGM\b\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:fL)?", "VGM"),
        (r"\bFerritine\b\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:µg/L|ng/mL)?", "Ferritine"),
        (r"[Pp]laquettes?\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:/mm3|G/L)?", "Plaquettes"),
        (r"[Ll]eucocytes?\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:/mm3|G/L)?", "Leucocytes"),
        (r"[Cc]r[ée]atinine?\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:µmol/L|mg/dL)?", "Créatinine"),
        (r"\bUr[ée]e\b\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:mmol/L|g/L)?", "Urée"),
        (r"(?:[Gg]lyc[ée]mie|[Gg]lucose)\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:mmol/L|g/L)?", "Glycémie"),
        (r"\bHbA1c\b\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:%)?", "HbA1c"),
        (r"\bTSH\b\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:mUI/L)?", "TSH"),
        # Albumine / Préalbumine (critère de sévérité HAS 2021 dénutrition)
        (r"(?:[Aa]lbumin[ée]?(?:mie)?|[Aa]lb(?:u)?[ée]?(?:mie)?)\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:g/[Ll])?", "Albumine"),
        (r"(?:[Pp]r[ée]albumine|[Tt]ransthyr[ée]tine)\s*[=:àa]?\s*(\d+(?:[.,]\d+)?)\s*(?:mg/[Ll]|g/[Ll])?", "Préalbumine"),
    ]


    # Contexte patient pour normes adaptées (âge/sexe)
    _patient_age = dossier.sejour.age if dossier.sejour else None
    _patient_sexe = dossier.sejour.sexe if dossier.sejour else None

    # Anti-doublons + limite par test (évite d'exploser le JSON)
    max_per_test = 6
    counts: dict[str, int] = {}
    seen: set[tuple[str, str]] = set()

    sanity_cfg = load_lab_value_sanity()
    policy = (sanity_cfg or {}).get("policy") or {}
    drop_out_of_range = bool(policy.get("drop_out_of_range", True))
    keep_suspect = bool(policy.get("keep_suspect", True))

    for pattern, test_name in bio_patterns:
        for m in re.finditer(pattern, text):
            raw_value = (m.group(1) or "").strip()
            if not raw_value:
                continue

            # Valeurs qualitatives (troponine négative/positive/normale) :
            # pas de sanitization numérique.
            if re.fullmatch(r"[a-zA-Zéèêëàâôûùïîç]+", raw_value):
                key = (test_name, raw_value.lower())
                if key in seen:
                    continue
                seen.add(key)
                counts[test_name] = counts.get(test_name, 0) + 1
                if counts[test_name] > max_per_test:
                    break
                anomalie = _is_abnormal(test_name, raw_value, _patient_age, _patient_sexe)
                dossier.biologie_cle.append(
                    BiologieCle(
                        test=test_name,
                        valeur=raw_value,
                        valeur_num=None,
                        anomalie=anomalie,
                        quality="ok",
                        discard_reason=None,
                    )
                )
                continue

            sanitized = _sanitize_bio_value(test_name, raw_value, sanity_cfg)
            if sanitized is None:
                continue
            token, val_num, quality, reason = sanitized

            if quality == "suspect" and not keep_suspect:
                quality = "discarded"
                reason = reason or "Valeur suspecte (policy keep_suspect=false)"

            # Déduplication sur la valeur normalisée
            key = (test_name, token)
            if key in seen:
                continue
            seen.add(key)

            counts[test_name] = counts.get(test_name, 0) + 1
            if counts[test_name] > max_per_test:
                break

            if quality == "discarded":
                # On garde la trace pour audit, sans polluer les règles qualité.
                dossier.biologie_discarded.append(
                    {
                        "test": test_name,
                        "raw": raw_value,
                        "valeur": token,
                        "valeur_num": val_num,
                        "reason": reason,
                    }
                )
                if drop_out_of_range:
                    continue

            anomalie = _is_abnormal(test_name, token, _patient_age, _patient_sexe)
            dossier.biologie_cle.append(
                BiologieCle(
                    test=test_name,
                    valeur=token,
                    valeur_num=val_num,
                    anomalie=anomalie,
                    quality=quality,
                    discard_reason=reason,
                )
            )

    # --- Complément par recherche vectorielle (Synonymes) ---
    _extract_biologie_faiss(text, dossier)