"""Mapare operatie ROAAUTO -> cod prestatie RAR + fuzzy lookup pentru editor.

Contract (varianta hibrida, decis 2026-06-15): un item de prestatie poate veni
fie cu `cod_prestatie` (cod RAR direct, ca pana acum), fie cu `cod_op_service`
(cod intern ROAAUTO) + `denumire`. La ingestie incercam sa rezolvam codul intern
prin `operations_mapping`; daca nu exista mapare -> submission `needs_mapping`
(nu se trimite la RAR), iar operatia apare in editorul web unde userul o mapeaza
cu ajutorul unei sugestii fuzzy pe nomenclatorul RAR. La salvarea maparii,
submission-urile blocate pe acel cod se re-rezolva automat.

Functiile de la inceput (normalize/suggest/resolve) sunt PURE (fara DB/HTTP),
unit-testabile direct. Cele cu `conn` sunt helpere de persistenta.
"""

from __future__ import annotations

import json
import unicodedata
from typing import Any

from rapidfuzz import fuzz, process

from . import errors as err_mod
from .nomenclator_seed import FALLBACK_NOMENCLATOR
from .validation import validate_prezentare

# Cont implicit cat timp auth API-key (CORE) nu e implementat: ingestiile vin cu
# account_id NULL si le atribuim contului seed-at in schema (id=1).
DEFAULT_ACCOUNT_ID = 1

# Sub acest scor (0..100) nu preselectam nicio sugestie — userul alege manual.
SUGGEST_MIN_SCORE = 60


# --------------------------------------------------------------------------- #
# Pur: normalizare + fuzzy + rezolvare                                        #
# --------------------------------------------------------------------------- #

def normalize_for_match(value: object) -> str:
    """Upper + fara diacritice + spatii colapsate, pentru potrivire robusta.

    'Reparație  motor' -> 'REPARATIE MOTOR'. Diacriticele romanesti (ă/â/î/ș/ț)
    si artefactele de encoding nu trebuie sa strice scorul fuzzy.
    """
    s = str(value or "")
    s = unicodedata.normalize("NFKD", s)
    s = "".join(ch for ch in s if not unicodedata.combining(ch))
    return " ".join(s.upper().split())


def suggest_codes(
    denumire: object,
    nomenclator: list[dict],
    *,
    limit: int = 5,
) -> list[dict]:
    """Clasament fuzzy al codurilor RAR pentru o denumire de operatie ROAAUTO.

    `nomenclator` = randuri {cod_prestatie, nume_prestatie}. Intoarce
    [{cod_prestatie, nume_prestatie, score}] sortat descrescator dupa scor.
    Daca denumirea e goala, intoarce nomenclatorul in ordinea data, scor 0.
    """
    query = normalize_for_match(denumire)
    rows = [r for r in nomenclator if (r.get("cod_prestatie") or "")]
    if not query:
        return [{**r, "score": 0.0} for r in rows[:limit]]

    choices = {r["cod_prestatie"]: normalize_for_match(r.get("nume_prestatie")) for r in rows}
    by_cod = {r["cod_prestatie"]: r for r in rows}
    # token_sort_ratio (nu token_set_ratio): recompenseaza acoperirea cat mai multor
    # cuvinte din denumire, in loc sa dea 100 la orice subset (ex. "REPARATIE" si
    # "REPARATIE ODOMETRU" ar fi egale la set_ratio).
    ranked = process.extract(
        query,
        choices,
        scorer=fuzz.token_sort_ratio,
        limit=limit,
    )
    # process.extract -> [(value, score, key)]; key = cod_prestatie.
    return [
        {
            "cod_prestatie": cod,
            "nume_prestatie": by_cod[cod].get("nume_prestatie"),
            "score": float(score),
        }
        for _val, score, cod in ranked
    ]


def resolve_prestatii(
    prestatii: list[dict] | None,
    mapping: dict[str, str],
) -> tuple[list[dict], list[dict]]:
    """Rezolva fiecare item: umple `cod_prestatie` din maparea op->cod unde lipseste.

    Reguli (hibrid):
      - item cu `cod_prestatie` -> pastrat ca atare (cod RAR direct).
      - item fara cod, cu `cod_op_service` in `mapping` -> umplem cod_prestatie.
      - item fara cod si fara mapare -> ramane nemapat.

    Intoarce (prestatii_rezolvate, nemapate). `prestatii_rezolvate` pastreaza
    si campurile originale (cod_op_service/denumire) ca re-rezolvarea sa aiba
    contextul; payload-ul RAR citeste doar cod_prestatie. `nemapate` =
    [{cod_op_service, denumire}] pentru editor.
    """
    resolved: list[dict] = []
    unmapped: list[dict] = []
    for item in prestatii or []:
        it = dict(item)
        cod = (it.get("cod_prestatie") or "").strip().upper()
        op = (it.get("cod_op_service") or "").strip()
        if cod:
            it["cod_prestatie"] = cod
        elif op and op in mapping:
            it["cod_prestatie"] = mapping[op]
        elif op:
            it["cod_prestatie"] = None
            unmapped.append({"cod_op_service": op, "denumire": it.get("denumire")})
        # item fara cod si fara op: il lasam asa; validarea de continut prinde
        # "prestatii goale"/cod lipsa.
        resolved.append(it)
    return resolved, unmapped


# --------------------------------------------------------------------------- #
# Persistenta (conn)                                                          #
# --------------------------------------------------------------------------- #

def account_or_default(account_id: int | None) -> int:
    return account_id if account_id is not None else DEFAULT_ACCOUNT_ID


def account_scope_clause(account_id: int) -> tuple[str, list]:
    """Fragment SQL + params pentru filtrarea pe cont in tabele cu account_id nullable.

    Aplica regula: NULL apartine contului 1 (legacy/OV-2).
    Foloseste DOAR pe submissions (account_id NULLABLE).
    NU folosi pe operations_mapping (account_id NOT NULL) — acolo WHERE account_id=? simplu.
    """
    return (
        "(account_id = ? OR (account_id IS NULL AND ? = 1))",
        [account_id, account_id],
    )


def seed_nomenclator_if_empty(conn) -> int:
    """Seed fallback (18 coduri din contract) DOAR daca nomenclator_rar e gol.

    Worker-ul suprascrie live; aici doar garantam ca editorul fuzzy merge offline.
    Intoarce nr. de randuri inserate.
    """
    n = conn.execute("SELECT COUNT(*) AS n FROM nomenclator_rar").fetchone()["n"]
    if n:
        return 0
    conn.executemany(
        "INSERT OR IGNORE INTO nomenclator_rar (cod_prestatie, nume_prestatie) VALUES (?, ?)",
        FALLBACK_NOMENCLATOR,
    )
    return len(FALLBACK_NOMENCLATOR)


def upsert_nomenclator(conn, items: list[dict]) -> int:
    """Upsert nomenclator live din RAR. `items` = forma API (codPrestatie/numePrestatie).

    Tolerant la chei: codPrestatie/cod_prestatie/cod, numePrestatie/nume_prestatie/nume.
    Intoarce nr. de coduri upsert-ate.
    """
    rows: list[tuple[str, str]] = []
    for it in items or []:
        if not isinstance(it, dict):
            continue
        cod = it.get("codPrestatie") or it.get("cod_prestatie") or it.get("cod")
        nume = it.get("numePrestatie") or it.get("nume_prestatie") or it.get("nume")
        if cod:
            rows.append((str(cod).strip().upper(), str(nume or "").strip()))
    if not rows:
        return 0
    conn.executemany(
        "INSERT INTO nomenclator_rar (cod_prestatie, nume_prestatie, updated_at) "
        "VALUES (?, ?, datetime('now')) "
        "ON CONFLICT(cod_prestatie) DO UPDATE SET nume_prestatie=excluded.nume_prestatie, "
        "updated_at=datetime('now')",
        rows,
    )
    return len(rows)


def load_nomenclator(conn) -> list[dict]:
    rows = conn.execute(
        "SELECT cod_prestatie, nume_prestatie FROM nomenclator_rar ORDER BY cod_prestatie"
    ).fetchall()
    return [dict(r) for r in rows]


def load_mapping(conn, account_id: int | None) -> dict[str, str]:
    """{cod_op_service -> cod_prestatie} pentru un cont."""
    acct = account_or_default(account_id)
    rows = conn.execute(
        "SELECT cod_op_service, cod_prestatie FROM operations_mapping WHERE account_id=?",
        (acct,),
    ).fetchall()
    return {r["cod_op_service"]: r["cod_prestatie"] for r in rows}


def load_mapping_meta(conn, account_id: int | None) -> dict[str, dict]:
    """{cod_op_service -> {cod_prestatie, auto_send}} pentru un cont.

    T6/OV-1: varianta extinsa care include si flagul auto_send per operatie.
    """
    acct = account_or_default(account_id)
    rows = conn.execute(
        "SELECT cod_op_service, cod_prestatie, auto_send FROM operations_mapping WHERE account_id=?",
        (acct,),
    ).fetchall()
    return {
        r["cod_op_service"]: {"cod_prestatie": r["cod_prestatie"], "auto_send": bool(r["auto_send"])}
        for r in rows
    }


def classify_prezentare(
    content: dict,
    mapping: dict[str, str],
    mapping_meta: dict[str, dict],
) -> dict:
    """Helper pur de clasificare: reproduce EXACT logica create_prezentari fara DB/efecte.

    Apelat de AMBELE rute (POST /v1/prezentari si POST /v1/prezentari/valideaza) pentru
    a garanta acelasi verdict — invariantul de corectitudine dry-run (PRD 5.2).

    Intoarce {"status", "rar_error", "resolved", "unmapped", "errors", "content"}.
    "content" = copia actualizata (VIN/nr canonicalizat + prestatii rezolvate).
    """
    from .idempotency import canonicalize_row  # import local: evita circular (mapping <- idempotency)

    c = dict(content)
    canon = canonicalize_row(c)
    c.update({
        "vin": canon["vin"],
        "nr_inmatriculare": canon["nr_inmatriculare"],
        "odometru_final": canon["odometru_final"],
    })

    resolved, unmapped = resolve_prestatii(c.get("prestatii"), mapping)
    c["prestatii"] = resolved

    if unmapped:
        status = "needs_mapping"
        coduri = ", ".join((u.get("cod_op_service") or "") for u in unmapped)
        rar_error = json.dumps(
            {"unmapped": unmapped, **err_mod.eroare("COD_NEMAPAT", cauza=f"Coduri fara mapare RAR: {coduri}")},
            ensure_ascii=False,
        )
        errors: list[dict] = []
    else:
        errors = validate_prezentare(c)
        if errors:
            status = "needs_data"
            rar_error = json.dumps(errors, ensure_ascii=False)
        elif has_no_auto_send(resolved, mapping_meta):
            status = "needs_mapping"
            mesaj = "cod mapat cu auto_send=0; review manual inainte de trimitere"
            rar_error = json.dumps(
                {"auto_send": mesaj, **err_mod.eroare("AUTO_SEND_OPRIT", cauza=mesaj)},
                ensure_ascii=False,
            )
        else:
            status = "queued"
            rar_error = None

    return {
        "status": status,
        "rar_error": rar_error,
        "resolved": resolved,
        "unmapped": unmapped,
        "errors": errors,
        "content": c,
    }


def has_no_auto_send(resolved: list[dict], mapping_meta: dict[str, dict]) -> bool:
    """Verifica daca vreun item rezolvat via mapping are auto_send=0.

    T6/OV-1: un cod nou-mapat cu auto_send=0 nu trebuie trimis automat.
    Items cu cod_prestatie direct (nu via cod_op_service) nu sunt afectate.
    """
    for item in resolved:
        op = (item.get("cod_op_service") or "").strip()
        if op and op in mapping_meta and not mapping_meta[op]["auto_send"]:
            return True
    return False


def pending_unmapped(conn, account_id=None) -> list[dict]:
    """Operatii distincte nemapate, agregate din submission-urile `needs_mapping`.

    account_id=None (default): global — intentionat pentru web/routes.py (back-compat).
    Apelantii noi din API TREBUIE sa paseze account_id explicit; None global e
    footgun (scurge cross-account) si e rezervat exclusiv pentru dashboard-ul intern.

    account_id=int: filtreaza in SQL pe cont inclusiv randuri legacy (account_id IS NULL
    apartine contului 1, OV-2). Filtrarea in SQL, nu post-hoc in Python.
    """
    nomenclator = load_nomenclator(conn)
    if account_id is not None:
        scope_sql, scope_params = account_scope_clause(account_id)
        rows = conn.execute(
            f"SELECT id, account_id, payload_json FROM submissions "
            f"WHERE status='needs_mapping' AND {scope_sql}",
            scope_params,
        ).fetchall()
    else:
        rows = conn.execute(
            "SELECT id, account_id, payload_json FROM submissions WHERE status='needs_mapping'"
        ).fetchall()

    agg: dict[tuple[int, str], dict[str, Any]] = {}
    for r in rows:
        acct = r["account_id"] if r["account_id"] is not None else DEFAULT_ACCOUNT_ID
        try:
            content = json.loads(r["payload_json"])
        except (ValueError, TypeError):
            continue
        for item in content.get("prestatii") or []:
            if not isinstance(item, dict):
                continue
            if (item.get("cod_prestatie") or ""):
                continue
            op = (item.get("cod_op_service") or "").strip()
            if not op:
                continue
            key = (acct, op)
            entry = agg.setdefault(
                key,
                {"account_id": acct, "cod_op_service": op, "denumire": item.get("denumire"), "blocked": 0, "_ids": set()},
            )
            if not entry["denumire"] and item.get("denumire"):
                entry["denumire"] = item.get("denumire")
            entry["_ids"].add(r["id"])

    out: list[dict] = []
    for entry in agg.values():
        entry["blocked"] = len(entry.pop("_ids"))
        entry["suggestions"] = suggest_codes(entry["denumire"], nomenclator, limit=5)
        out.append(entry)
    out.sort(key=lambda e: (-e["blocked"], e["cod_op_service"]))
    return out


def save_mapping(conn, account_id: int | None, cod_op_service: str, cod_prestatie: str, auto_send: bool) -> None:
    """Upsert o mapare op->cod (UNIQUE pe account_id+cod_op_service)."""
    acct = account_or_default(account_id)
    op = (cod_op_service or "").strip()
    cod = (cod_prestatie or "").strip().upper()
    if not op or not cod:
        raise ValueError("cod_op_service si cod_prestatie sunt obligatorii")
    conn.execute(
        "INSERT INTO operations_mapping (account_id, cod_op_service, cod_prestatie, auto_send) "
        "VALUES (?, ?, ?, ?) "
        "ON CONFLICT(account_id, cod_op_service) DO UPDATE SET "
        "cod_prestatie=excluded.cod_prestatie, auto_send=excluded.auto_send",
        (acct, op, cod, 1 if auto_send else 0),
    )


def reresolve_account(conn, account_id: int | None, batch_id: int | None = None) -> dict[str, int]:
    """Re-rezolva submission-urile `needs_mapping` ale unui cont dupa o noua mapare.

    Pentru fiecare: aplica maparea curenta; daca nu mai raman op-uri nemapate ->
    ruleaza validarea de continut (T3) si trece pe `queued` (sau `needs_data` cu
    motiv), resetand backoff-ul. Daca raman nemapate, ramane `needs_mapping` cu
    motivul actualizat. Intoarce {requeued, still_blocked, needs_data, review_manual}.

    T6/OV-1: auto_send=0 pe un cod nou-mapat -> nu trece pe 'queued' (ramane
    'needs_mapping' cu motiv "review manual"); previne FINALIZATA eronat permanent.

    T7: batch_id != None -> scope la seria comitata (NU cross-batch).
        batch_id is None -> re-rezolva toti (canal API, batch_id IS NULL inclus).
    """
    acct = account_or_default(account_id)
    mapping_meta = load_mapping_meta(conn, acct)
    mapping = {op: meta["cod_prestatie"] for op, meta in mapping_meta.items()}

    if batch_id is not None:
        # T7: scope la batch-ul specificat (import commit explicit).
        # NU atinge randuri din alte batches sau din feed API.
        rows = conn.execute(
            "SELECT id, payload_json FROM submissions "
            "WHERE status='needs_mapping' AND account_id=? AND batch_id=?",
            (acct, batch_id),
        ).fetchall()
    else:
        # POST /v1/mapari (save manual): re-rezolva EXCLUSIV canalul API (batch_id IS NULL).
        # T7/R1 INCHIS: salvarea unei mapari NU re-queues randuri din batches de import
        # (cross-batch / cross-feed). Batches de import sunt re-rezolvate doar la commit explicit.
        rows = conn.execute(
            "SELECT id, payload_json FROM submissions "
            "WHERE status='needs_mapping' AND account_id=? AND batch_id IS NULL",
            (acct,),
        ).fetchall()

    stats = {"requeued": 0, "still_blocked": 0, "needs_data": 0, "review_manual": 0}
    for r in rows:
        try:
            content = json.loads(r["payload_json"])
        except (ValueError, TypeError):
            continue
        resolved, unmapped = resolve_prestatii(content.get("prestatii"), mapping)
        content["prestatii"] = resolved
        payload_json = json.dumps(content, ensure_ascii=False)

        if unmapped:
            conn.execute(
                "UPDATE submissions SET payload_json=?, rar_error=?, updated_at=datetime('now') WHERE id=?",
                (payload_json, json.dumps({"unmapped": unmapped}, ensure_ascii=False), r["id"]),
            )
            stats["still_blocked"] += 1
            continue

        # T6/OV-1: verifica auto_send inainte de re-queuing
        if has_no_auto_send(resolved, mapping_meta):
            conn.execute(
                "UPDATE submissions SET payload_json=?, rar_error=?, updated_at=datetime('now') WHERE id=?",
                (
                    payload_json,
                    json.dumps({"auto_send": "cod mapat cu auto_send=0; review manual inainte de trimitere"}, ensure_ascii=False),
                    r["id"],
                ),
            )
            stats["review_manual"] += 1
            continue

        errors = validate_prezentare(content)
        if errors:
            conn.execute(
                "UPDATE submissions SET status='needs_data', payload_json=?, rar_error=?, "
                "updated_at=datetime('now') WHERE id=?",
                (payload_json, json.dumps(errors, ensure_ascii=False), r["id"]),
            )
            stats["needs_data"] += 1
        else:
            conn.execute(
                "UPDATE submissions SET status='queued', payload_json=?, rar_error=NULL, "
                "retry_count=0, next_attempt_at=NULL, updated_at=datetime('now') WHERE id=?",
                (payload_json, r["id"]),
            )
            stats["requeued"] += 1
    return stats