# -*- coding: utf-8 -*-
from __future__ import annotations

import os
import time
import uuid
import random
import logging
import hashlib
import re
import json
from typing import List, Optional, Dict, Any, Tuple

import numpy as np
import requests
from fastapi import FastAPI, BackgroundTasks, Header, HTTPException, Query
from pydantic import BaseModel, Field

# ======================================================================================
# Logging
# ======================================================================================
logging.basicConfig(level=logging.INFO, format="%(levelname)s:%(name)s:%(message)s")
LOG = logging.getLogger("remote_indexer")

# ======================================================================================
# ENV (config)
# ======================================================================================

# Ordre des backends d'embeddings. Ex: "deepinfra,hf"
EMB_BACKEND_ORDER = [
    s.strip().lower()
    for s in os.getenv("EMB_BACKEND_ORDER", os.getenv("EMB_BACKEND", "deepinfra,hf")).split(",")
    if s.strip()
]

# --- DeepInfra Embeddings (OpenAI-like) ---
DI_TOKEN   = os.getenv("DEEPINFRA_API_KEY", "").strip()
DI_MODEL   = os.getenv("DEEPINFRA_EMBED_MODEL", "BAAI/bge-m3").strip()
DI_URL     = os.getenv("DEEPINFRA_EMBED_URL", "https://api.deepinfra.com/v1/openai/embeddings").strip()
DI_TIMEOUT = float(os.getenv("EMB_TIMEOUT_SEC", "120"))

# --- Hugging Face Inference API ---
HF_TOKEN    = os.getenv("HF_API_TOKEN", "").strip()
HF_MODEL    = os.getenv("HF_EMBED_MODEL", "sentence-transformers/all-MiniLM-L6-v2").strip()
HF_URL_PIPE = os.getenv("HF_API_URL_PIPELINE", "").strip() or (
    f"https://api-inference.huggingface.co/pipeline/feature-extraction/{HF_MODEL}"
)
HF_URL_MODL = os.getenv("HF_API_URL_MODELS", "").strip() or (
    f"https://api-inference.huggingface.co/models/{HF_MODEL}"
)
HF_TIMEOUT  = float(os.getenv("EMB_TIMEOUT_SEC", "120"))
HF_WAIT     = os.getenv("HF_WAIT_FOR_MODEL", "true").lower() in ("1", "true", "yes", "on")

# --- Retries / backoff ---
RETRY_MAX      = int(os.getenv("EMB_RETRY_MAX", "6"))
RETRY_BASE_SEC = float(os.getenv("EMB_RETRY_BASE", "1.6"))
RETRY_JITTER   = float(os.getenv("EMB_RETRY_JITTER", "0.35"))

# --- Vector store (Qdrant / Memory fallback) ---
VECTOR_STORE = os.getenv("VECTOR_STORE", "qdrant").strip().lower()
QDRANT_URL   = os.getenv("QDRANT_URL", "").strip()
QDRANT_API   = os.getenv("QDRANT_API_KEY", "").strip()

# IDs déterministes activés ?
QDRANT_DETERMINISTIC_IDS = os.getenv("QDRANT_DETERMINISTIC_IDS", "true").lower() in ("1","true","yes","on")
QDRANT_ID_MODE = os.getenv("QDRANT_ID_MODE", "uuid").strip().lower()  # uuid|int

# Wipe automatique avant chaque /index (optionnel)
WIPE_BEFORE_INDEX = os.getenv("WIPE_BEFORE_INDEX", "false").lower() in ("1","true","yes","on")

# --- Auth d’API de ce service (simple header) ---
AUTH_TOKEN = os.getenv("REMOTE_INDEX_TOKEN", "").strip()

LOG.info(f"Embeddings backend order = {EMB_BACKEND_ORDER}")
LOG.info(f"HF pipeline URL = {HF_URL_PIPE}")
LOG.info(f"HF models   URL = {HF_URL_MODL}")
LOG.info(f"VECTOR_STORE = {VECTOR_STORE}")

if "deepinfra" in EMB_BACKEND_ORDER and not DI_TOKEN:
    LOG.warning("DEEPINFRA_API_KEY manquant — tentatives DeepInfra échoueront.")
if "hf" in EMB_BACKEND_ORDER and not HF_TOKEN:
    LOG.warning("HF_API_TOKEN manquant — tentatives HF échoueront.")

# ======================================================================================
# Vector Stores (Memory + Qdrant)
# ======================================================================================
try:
    from qdrant_client import QdrantClient
    from qdrant_client.http.models import VectorParams, Distance, PointStruct
except Exception:
    QdrantClient = None
    PointStruct = None

class BaseStore:
    def ensure_collection(self, name: str, dim: int): ...
    def upsert(self, name: str, vectors: np.ndarray, payloads: List[Dict[str, Any]]) -> int: ...
    def search(self, name: str, query_vec: np.ndarray, top_k: int) -> List[Dict[str, Any]]: ...
    def wipe(self, name: str): ...

class MemoryStore(BaseStore):
    """Store en mémoire (volatile) — fallback/tests."""
    def __init__(self):
        self.db: Dict[str, Dict[str, Any]] = {}  # name -> {"vecs":[np.ndarray], "payloads":[dict], "dim":int}

    def ensure_collection(self, name: str, dim: int):
        self.db.setdefault(name, {"vecs": [], "payloads": [], "dim": dim})

    def upsert(self, name: str, vectors: np.ndarray, payloads: List[Dict[str, Any]]) -> int:
        if name not in self.db:
            raise RuntimeError(f"MemoryStore: collection {name} inconnue")
        if len(vectors) != len(payloads):
            raise ValueError("MemoryStore.upsert: tailles vectors/payloads incohérentes")
        self.db[name]["vecs"].extend([np.asarray(v, dtype=np.float32) for v in vectors])
        self.db[name]["payloads"].extend(payloads)
        return len(vectors)

    def search(self, name: str, query_vec: np.ndarray, top_k: int) -> List[Dict[str, Any]]:
        if name not in self.db or not self.db[name]["vecs"]:
            return []
        mat = np.vstack(self.db[name]["vecs"]).astype(np.float32)  # [N, dim]
        q = query_vec.reshape(1, -1).astype(np.float32)
        sims = (mat @ q.T).ravel()  # cosine (embeddings normalisés en amont)
        top_idx = np.argsort(-sims)[:top_k]
        out = []
        for i in top_idx:
            pl = dict(self.db[name]["payloads"][i]); pl["_score"] = float(sims[i])
            out.append(pl)
        return out

    def wipe(self, name: str):
        self.db.pop(name, None)

def _stable_point_id_uuid(collection: str, payload: Dict[str, Any]) -> str:
    """
    UUID v5 déterministe: uuid5(NAMESPACE_URL, 'collection|path|chunk|start|end|BLAKE8(text)')
    """
    path  = str(payload.get("path", ""))
    chunk = str(payload.get("chunk", ""))
    start = str(payload.get("start", ""))
    end   = str(payload.get("end", ""))
    text  = payload.get("text", "")
    # hash court du texte pour stabiliser l’empreinte sans tout concaténer
    h = hashlib.blake2b((text or "").encode("utf-8", "ignore"), digest_size=8).hexdigest()
    base = f"{collection}|{path}|{chunk}|{start}|{end}|{h}"
    return str(uuid.uuid5(uuid.NAMESPACE_URL, base))

class QdrantStore(BaseStore):
    """Store Qdrant — IDs UUID déterministes (par défaut) ou entiers séquentiels."""
    def __init__(self, url: str, api_key: Optional[str] = None,
                 deterministic_ids: bool = True, id_mode: str = "uuid"):
        if QdrantClient is None or PointStruct is None:
            raise RuntimeError("qdrant_client non disponible")
        self.client = QdrantClient(url=url, api_key=api_key if api_key else None)
        self._next_ids: Dict[str, int] = {}
        self._deterministic = deterministic_ids
        self._id_mode = id_mode if id_mode in ("uuid", "int") else "uuid"

    def _init_next_id(self, name: str):
        try:
            cnt = self.client.count(collection_name=name, exact=True).count
        except Exception:
            cnt = 0
        self._next_ids[name] = int(cnt)

    def ensure_collection(self, name: str, dim: int):
        try:
            self.client.get_collection(name)
        except Exception:
            self.client.create_collection(
                collection_name=name,
                vectors_config=VectorParams(size=dim, distance=Distance.COSINE),
            )
        if name not in self._next_ids:
            self._init_next_id(name)

    def upsert(self, name: str, vectors: np.ndarray, payloads: List[Dict[str, Any]]) -> int:
        if vectors is None or len(vectors) == 0:
            return 0
        if len(vectors) != len(payloads):
            raise ValueError("QdrantStore.upsert: tailles vectors/payloads incohérentes")

        points: List[PointStruct] = []
        added = 0

        if self._deterministic and self._id_mode == "uuid":
            # UUID déterministes => Qdrant Cloud OK, remplace si existe
            seen = set()
            for v, pl in zip(vectors, payloads):
                pid = _stable_point_id_uuid(name, pl)
                if pid in seen:
                    continue  # dédup intra-batch
                seen.add(pid)
                points.append(PointStruct(id=pid,
                                          vector=np.asarray(v, dtype=np.float32).tolist(),
                                          payload=pl))
            if points:
                self.client.upsert(collection_name=name, points=points)
                added = len(points)

        elif self._deterministic and self._id_mode == "int":
            # int déterministes (peu utile si on veut remplacer)
            seen = set()
            for v, pl in zip(vectors, payloads):
                pid_str = _stable_point_id_uuid(name, pl)
                pid_int = uuid.UUID(pid_str).int >> 64
                if pid_int in seen:
                    continue
                seen.add(pid_int)
                points.append(PointStruct(id=int(pid_int),
                                          vector=np.asarray(v, dtype=np.float32).tolist(),
                                          payload=pl))
            if points:
                self.client.upsert(collection_name=name, points=points)
                added = len(points)

        else:
            # IDs séquentiels -> append-only
            if name not in self._next_ids:
                self._init_next_id(name)
            start = self._next_ids[name]
            for i, (v, pl) in enumerate(zip(vectors, payloads)):
                points.append(PointStruct(id=start + i,
                                          vector=np.asarray(v, dtype=np.float32).tolist(),
                                          payload=pl))
            if points:
                self.client.upsert(collection_name=name, points=points)
                added = len(points)
                self._next_ids[name] += added

        LOG.debug(f"QdrantStore.upsert: +{added} points (deterministic={self._deterministic}, mode={self._id_mode})")
        return added

    def search(self, name: str, query_vec: np.ndarray, top_k: int) -> List[Dict[str, Any]]:
        qv = query_vec[0].astype(np.float32).tolist() if query_vec.ndim == 2 else query_vec.astype(np.float32).tolist()
        res = self.client.search(collection_name=name, query_vector=qv, limit=int(top_k))
        out = []
        for p in res:
            pl = p.payload or {}
            try:
                pl["_score"] = float(p.score)
            except Exception:
                pl["_score"] = None
            out.append(pl)
        return out

    def wipe(self, name: str):
        try:
            self.client.delete_collection(name)
        except Exception:
            pass
        self._next_ids.pop(name, None)

# Initialisation du store actif
try:
    if VECTOR_STORE == "qdrant" and QDRANT_URL:
        STORE: BaseStore = QdrantStore(
            QDRANT_URL,
            api_key=QDRANT_API if QDRANT_API else None,
            deterministic_ids=QDRANT_DETERMINISTIC_IDS,
            id_mode=QDRANT_ID_MODE,
        )
        _ = STORE.client.get_collections()  # ping
        LOG.info("Connecté à Qdrant.")
        VECTOR_STORE_ACTIVE = "QdrantStore"
    else:
        raise RuntimeError("Qdrant non configuré, fallback mémoire.")
except Exception as e:
    LOG.error(f"Qdrant indisponible (Connexion Qdrant impossible: {e}) — fallback en mémoire.")
    STORE = MemoryStore()
    VECTOR_STORE_ACTIVE = "MemoryStore"
    LOG.warning("Vector store: MEMORY (fallback). Les données sont volatiles (perdues au restart).")

# ======================================================================================
# Pydantic I/O
# ======================================================================================

class FileIn(BaseModel):
    path: Optional[str] = ""   # tolérancemajeure: accepte None
    text: Optional[str] = ""   # idem

class IndexRequest(BaseModel):
    project_id: str = Field(..., min_length=1)
    files: List[FileIn]
    chunk_size: int = 1200
    overlap: int = 200
    batch_size: int = 8
    store_text: bool = True

class QueryRequest(BaseModel):
    project_id: str
    query: str
    top_k: int = 6

class StatusBody(BaseModel):
    job_id: str

# ======================================================================================
# Jobs store (mémoire)
# ======================================================================================
JOBS: Dict[str, Dict[str, Any]] = {}  # {job_id: {"status": "...", "logs": [...], "created": ts}}

def _append_log(job_id: str, line: str):
    job = JOBS.get(job_id)
    if job:
        job["logs"].append(line)

def _set_status(job_id: str, status: str):
    job = JOBS.get(job_id)
    if job:
        job["status"] = status

def _auth(x_auth: Optional[str]):
    if AUTH_TOKEN and (x_auth or "") != AUTH_TOKEN:
        raise HTTPException(401, "Unauthorized")

# ======================================================================================
# Embeddings backends + retry/fallback
# ======================================================================================

def _retry_sleep(attempt: int) -> float:
    back = (RETRY_BASE_SEC ** attempt)
    jitter = 1.0 + random.uniform(-RETRY_JITTER, RETRY_JITTER)
    return max(0.25, back * jitter)

def _normalize_rows(arr: np.ndarray) -> np.ndarray:
    arr = np.asarray(arr, dtype=np.float32)
    norms = np.linalg.norm(arr, axis=1, keepdims=True) + 1e-12
    return (arr / norms).astype(np.float32)

def _di_post_embeddings_once(batch: List[str]) -> Tuple[np.ndarray, int]:
    if not DI_TOKEN:
        raise RuntimeError("DEEPINFRA_API_KEY manquant (backend=deepinfra).")
    headers = {"Authorization": f"Bearer {DI_TOKEN}", "Content-Type": "application/json"}
    payload = {"model": DI_MODEL, "input": batch}
    r = requests.post(DI_URL, headers=headers, json=payload, timeout=DI_TIMEOUT)
    size = int(r.headers.get("Content-Length", "0") or 0)
    if r.status_code >= 400:
        LOG.error(f"DeepInfra error {r.status_code}: {r.text[:1000]}")
        r.raise_for_status()
    js = r.json()
    data = js.get("data")
    if not isinstance(data, list) or not data:
        raise RuntimeError(f"DeepInfra embeddings: réponse invalide {js}")
    embs = [d.get("embedding") for d in data]
    arr = np.asarray(embs, dtype=np.float32)
    if arr.ndim != 2:
        raise RuntimeError(f"DeepInfra: unexpected embeddings shape: {arr.shape}")
    return _normalize_rows(arr), size

def _hf_post_embeddings_once(batch: List[str]) -> Tuple[np.ndarray, int]:
    if not HF_TOKEN:
        raise RuntimeError("HF_API_TOKEN manquant (backend=hf).")
    headers = {
        "Authorization": f"Bearer {HF_TOKEN}",
        "Content-Type": "application/json",
    }
    if HF_WAIT:
        headers["X-Wait-For-Model"] = "true"
        headers["X-Use-Cache"] = "true"

    def _call(url: str, payload: Dict[str, Any], extra_headers: Optional[Dict[str, str]] = None):
        h = dict(headers)
        if extra_headers:
            h.update(extra_headers)
        r = requests.post(url, headers=h, json=payload, timeout=HF_TIMEOUT)
        return r

    payload = {"inputs": batch if len(batch) > 1 else batch[0]}
    r = _call(HF_URL_PIPE, payload)
    size = int(r.headers.get("Content-Length", "0") or 0)
    if r.status_code == 404:
        LOG.error("HF error 404: Not Found")
        LOG.warning(f"HF endpoint {HF_URL_PIPE} non dispo (404), fallback vers alternative ...")
    elif r.status_code >= 400:
        LOG.error(f"HF error {r.status_code}: {r.text[:1000]}")
        r.raise_for_status()
    else:
        data = r.json()
        arr = np.array(data, dtype=np.float32)
        if arr.ndim == 3:
            arr = arr.mean(axis=1)
        if arr.ndim == 1:
            arr = arr.reshape(1, -1)
        if arr.ndim != 2:
            raise RuntimeError(f"HF: unexpected embeddings shape: {arr.shape}")
        return _normalize_rows(arr), size

    r2 = _call(HF_URL_MODL, payload)
    size2 = int(r2.headers.get("Content-Length", "0") or 0)
    if r2.status_code >= 400:
        LOG.error(f"HF error {r2.status_code}: {r2.text[:1000]}")
        if r2.status_code == 400 and "SentenceSimilarityPipeline" in (r2.text or ""):
            LOG.warning("HF MODELS a choisi Similarity -> retry avec ?task=feature-extraction + X-Task")
            r3 = _call(
                HF_URL_MODL + "?task=feature-extraction",
                payload,
                extra_headers={"X-Task": "feature-extraction"}
            )
            size3 = int(r3.headers.get("Content-Length", "0") or 0)
            if r3.status_code >= 400:
                LOG.error(f"HF error {r3.status_code}: {r3.text[:1000]}")
                r3.raise_for_status()
            data3 = r3.json()
            arr3 = np.array(data3, dtype=np.float32)
            if arr3.ndim == 3:
                arr3 = arr3.mean(axis=1)
            if arr3.ndim == 1:
                arr3 = arr3.reshape(1, -1)
            if arr3.ndim != 2:
                raise RuntimeError(f"HF: unexpected embeddings shape: {arr3.shape}")
            return _normalize_rows(arr3), size3
        else:
            r2.raise_for_status()
    data2 = r2.json()
    arr2 = np.array(data2, dtype=np.float32)
    if arr2.ndim == 3:
        arr2 = arr2.mean(axis=1)
    if arr2.ndim == 1:
        arr2 = arr2.reshape(1, -1)
    if arr2.ndim != 2:
        raise RuntimeError(f"HF: unexpected embeddings shape: {arr2.shape}")
    return _normalize_rows(arr2), size2

def _call_with_retries(func, batch: List[str], label: str, job_id: Optional[str] = None) -> Tuple[np.ndarray, int]:
    last_exc = None
    for attempt in range(RETRY_MAX):
        try:
            if job_id:
                _append_log(job_id, f"{label}: try {attempt+1}/{RETRY_MAX} (batch={len(batch)})")
            return func(batch)
        except requests.HTTPError as he:
            code = he.response.status_code if he.response is not None else "HTTP"
            retriable = code in (429, 500, 502, 503, 504)
            if not retriable:
                raise
            sleep_s = _retry_sleep(attempt)
            msg = f"{label}: HTTP {code}, retry in {sleep_s:.1f}s"
            LOG.warning(msg); _append_log(job_id, msg)
            time.sleep(sleep_s)
            last_exc = he
        except Exception as e:
            sleep_s = _retry_sleep(attempt)
            msg = f"{label}: error {type(e).__name__}: {e}, retry in {sleep_s:.1f}s"
            LOG.warning(msg); _append_log(job_id, msg)
            time.sleep(sleep_s)
            last_exc = e
    raise RuntimeError(f"{label}: retries exhausted: {last_exc}")

def _post_embeddings(batch: List[str], job_id: Optional[str] = None) -> Tuple[np.ndarray, int]:
    last_err = None
    for b in EMB_BACKEND_ORDER:
        if b == "deepinfra":
            try:
                return _call_with_retries(_di_post_embeddings_once, batch, "DeepInfra", job_id)
            except Exception as e:
                last_err = e; _append_log(job_id, f"DeepInfra failed: {e}."); LOG.error(f"DeepInfra failed: {e}")
        elif b == "hf":
            try:
                return _call_with_retries(_hf_post_embeddings_once, batch, "HF", job_id)
            except Exception as e:
                last_err = e; _append_log(job_id, f"HF failed: {e}."); LOG.error(f"HF failed: {e}")
                if "SentenceSimilarityPipeline" in str(e) and "deepinfra" not in EMB_BACKEND_ORDER:
                    _append_log(job_id, "Auto-fallback DeepInfra (HF => SentenceSimilarity).")
                    try:
                        return _call_with_retries(_di_post_embeddings_once, batch, "DeepInfra", job_id)
                    except Exception as e2:
                        last_err = e2; _append_log(job_id, f"DeepInfra failed after HF: {e2}."); LOG.error(f"DeepInfra failed after HF: {e2}")
        else:
            _append_log(job_id, f"Backend inconnu ignoré: {b}")
    raise RuntimeError(f"Tous les backends ont échoué: {last_err}")

# ======================================================================================
# Helpers chunking
# ======================================================================================

def _chunk_with_spans(text: str, size: int, overlap: int):
    n = len(text or "")
    if size <= 0:
        yield (0, n, text); return
    i = 0
    while i < n:
        j = min(n, i + size)
        yield (i, j, text[i:j])
        i = max(0, j - overlap)
        if i >= n:
            break

def _clean_chunk_text(text: str) -> str:
    """
    Nettoyage simple des fragments JSON / artefacts:
    - supprime un champ "indexed_at" tronqué à la fin,
    - supprime accolades/caractères isolés en début/fin,
    - compacte sauts de ligne multiples,
    - tente d'extraire des valeurs textuelles si le chunk ressemble fortement à du JSON.
    """
    if not text:
        return text
    t = (text or "").strip()

    # retirer un suffixe typique: , "indexed_at": "2025-..."}}
    t = re.sub(r',\s*"indexed_at"\s*:\s*"[^"]*"\s*}+\s*$', '', t, flags=re.IGNORECASE)

    # retirer d'autres clés timestamps communes à la fin si tronquées
    t = re.sub(r',\s*"(created_at|timestamp|time|date)"\s*:\s*"[^"]*"\s*}+\s*$', '', t, flags=re.IGNORECASE)

    # retirer accolades ou crochets seuls en début/fin
    t = re.sub(r'^[\s\]\}\,]+', '', t)
    t = re.sub(r'[\s\]\}\,]+$', '', t)

    # si le chunk ressemble majoritairement à du JSON (beaucoup de ":" ou "{"), essayer d'en extraire les valeurs textuelles
    if t.count(':') >= 3 and (t.count('{') + t.count('}')) >= 1:
        try:
            j = json.loads(t)
            if isinstance(j, dict):
                # concatène les valeurs textuelles pertinentes
                vals = []
                for v in j.values():
                    if isinstance(v, (str, int, float)):
                        vals.append(str(v))
                if vals:
                    t = " ".join(vals)
        except Exception:
            # ignore, on garde t tel quel
            pass

    # compacter sauts de ligne
    t = re.sub(r'\n{3,}', '\n\n', t)
    return t.strip()

# ======================================================================================
# Background task : indexation — VERSION CORRIGÉE (ajouts anti-dup & robustesse)
# ======================================================================================

def run_index_job(job_id: str, req: IndexRequest):
    try:
        _set_status(job_id, "running")
        _append_log(job_id, f"Start project={req.project_id} files={len(req.files)} | backends={EMB_BACKEND_ORDER} | store={VECTOR_STORE} (deterministic_ids={QDRANT_DETERMINISTIC_IDS}, mode={QDRANT_ID_MODE})")
        LOG.info(f"[{job_id}] Index start project={req.project_id} files={len(req.files)}")

        # ensemble de hashes de chunks déjà vus dans ce job (dédup intra-job)
        seen_chunk_hashes = set()

        # --- DEBUG DIAGNOSTIC (INSÈRE ICI) ---
        try:
            N_SAMPLE = 6
            sample = req.files[:N_SAMPLE]
            seen_hashes = {}
            for fidx, fi in enumerate(sample, 1):
                p = (getattr(fi, "path", "") or "") or ""
                t = (getattr(fi, "text", "") or "") or ""
                h = hashlib.blake2b((t or "").encode("utf-8", "ignore"), digest_size=8).hexdigest()
                seen_hashes.setdefault(h, []).append(p)
                LOG.info(f"[{job_id}] recv file #{fidx}: path={p!r} len_text={len(t)} hash8={h} preview={repr(t[:120])}")
            if len(req.files) > N_SAMPLE:
                LOG.info(f"[{job_id}] ... and {len(req.files)-N_SAMPLE} more files")
            if len(seen_hashes) == 1 and len(req.files) > 1:
                _append_log(job_id, "⚠️ All received files appear IDENTICAL (same hash). Possible client-side bug.")
                LOG.warning("[%s] All files identical by hash8=%s", job_id, list(seen_hashes.keys())[0])
        except Exception as _e:
            LOG.exception("Debug sample failed: %s", _e)
        # --- end debug block ---

        col = f"proj_{req.project_id}"

        # Option: wipe avant index
        if WIPE_BEFORE_INDEX:
            try:
                STORE.wipe(col)
                _append_log(job_id, f"Wiped existing collection: {col}")
            except Exception as e:
                _append_log(job_id, f"Wipe failed (ignored): {e}")

        # --- WARMUP: calculer un embedding de test pour déterminer la dimension (dim) ---
        # On prend un chunk de départ (ou une string 'warmup' si pas de fichiers)
        if req.files:
            warm_text = next(_chunk_with_spans((req.files[0].text or "") , req.chunk_size, req.overlap))[2]
        else:
            warm_text = "warmup"
        try:
            embs, sz = _post_embeddings([warm_text], job_id=job_id)
            if embs is None or embs.ndim != 2:
                raise RuntimeError("Warmup embeddings invalid shape")
            dim = int(embs.shape[1])
            LOG.info(f"[{job_id}] warmup embeddings shape = {embs.shape} dtype={embs.dtype}")
            _append_log(job_id, f"warmup embeddings shape = {embs.shape} dim={dim}")
        except Exception as e:
            LOG.exception("[%s] Warmup embeddings failed: %s", job_id, e)
            _append_log(job_id, f"Warmup embeddings failed: {e}")
            _set_status(job_id, "error")
            return

        # If using QdrantStore: check existing collection vector size and warn if mismatch
        if isinstance(STORE, QdrantStore):
            try:
                # client.get_collection throws if not exists
                info = STORE.client.get_collection(collection_name=col)
                existing_size = None
                # depending on qdrant client version, structure might be different:
                if hasattr(info, "result") and isinstance(info.result, dict):
                    cfg = info.result.get("params") or {}
                    vectors = cfg.get("vectors") or {}
                    existing_size = int(vectors.get("size")) if vectors.get("size") else None
                elif isinstance(info, dict):
                    cfg = info.get("result", info)
                    vectors = cfg.get("params", {}).get("vectors", {})
                    existing_size = int(vectors.get("size")) if vectors else None

                if existing_size and existing_size != dim:
                    msg = (f"Qdrant collection {col} already exists with dim={existing_size} but embeddings dim={dim}. "
                           "This will likely cause vectors to be rejected. Consider wiping or recreating collection.")
                    LOG.error("[%s] %s", job_id, msg)
                    _append_log(job_id, msg)
                    # Optional: if WIPE_BEFORE_INDEX True, recreate:
                    if WIPE_BEFORE_INDEX:
                        try:
                            STORE.wipe(col)
                            STORE.ensure_collection(col, dim)
                            _append_log(job_id, f"Recreated collection {col} with dim={dim} (WIPE_BEFORE_INDEX).")
                        except Exception as e:
                            _append_log(job_id, f"Failed recreate collection: {e}")
            except Exception as e:
                # collection not present or unable to introspect -> ok, ensure_collection will create
                LOG.debug("[%s] Could not introspect collection: %s", job_id, e)

        STORE.ensure_collection(col, dim)
        _append_log(job_id, f"Collection ready: {col} (dim={dim})")

        total_chunks = 0
        buf_chunks: List[str] = []
        buf_metas: List[Dict[str, Any]] = []

        def _flush():
            nonlocal buf_chunks, buf_metas, total_chunks
            if not buf_chunks:
                return

            # ✅ DÉDUP INTRA-BATCH (même texte → même ID)
            if QDRANT_DETERMINISTIC_IDS:
                before = len(buf_metas)
                seen = set()
                dedup_chunks, dedup_metas = [], []
                for txt, meta in zip(buf_chunks, buf_metas):
                    pid = _stable_point_id_uuid(col, meta) if QDRANT_ID_MODE == "uuid" else uuid.UUID(_stable_point_id_uuid(col, meta)).int >> 64
                    if pid in seen:
                        continue
                    seen.add(pid)
                    dedup_chunks.append(txt); dedup_metas.append(meta)
                buf_chunks, buf_metas = dedup_chunks, dedup_metas
                skipped = before - len(buf_metas)
                if skipped > 0:
                    _append_log(job_id, f"Dedup intra-batch: skipped {skipped} duplicates")

            try:
                vecs, sz = _post_embeddings(buf_chunks, job_id=job_id)
            except Exception as e:
                # échec -> journaliser et faire échouer le job proprement (on ne vide pas le buffer pour debug mais on arrête)
                LOG.exception("[%s] Embeddings failed during flush: %s", job_id, e)
                _append_log(job_id, f"Embeddings failed during flush: {e}")
                _set_status(job_id, "error")
                raise

            added = STORE.upsert(col, vecs, buf_metas)
            total_chunks += added
            _append_log(job_id, f"+{added} chunks (total={total_chunks}) ~{(sz/1024.0):.1f}KiB")
            # vider buffers ONLY après succès
            buf_chunks, buf_metas = [], []

        # ✅ Filtre des fichiers pertinents
        TEXT_EXTS = {".py", ".md", ".txt", ".yaml", ".yml", ".json", ".sh", ".dockerfile", ".ini", ".cfg", ".toml", ".env"}
        IGNORE_PREFIXES = {".git", "__pycache__", ".vscode", ".idea", "node_modules", "build", "dist", "venv", ".env", ".log", ".tmp"}

        for fi, f in enumerate(req.files, 1):
            # defensive: path/text peuvent être None -> utiliser fallback
            path_raw = (getattr(f, "path", "") or "")  # peut être None
            path = (path_raw or "").strip()
            text_raw = (getattr(f, "text", "") or "")
            text = text_raw or ""

            if not path:
                # fallback path stable basé sur hash du texte (pour éviter collisions None)
                h8 = hashlib.blake2b((text or "").encode("utf-8", "ignore"), digest_size=8).hexdigest()
                path = f"__no_path__{h8}"

            if any(path.startswith(p) for p in IGNORE_PREFIXES):
                _append_log(job_id, f"📁 Ignored: {path} (dossier ignoré)")
                continue

            ext = os.path.splitext(path)[1].lower()
            if ext not in TEXT_EXTS:
                _append_log(job_id, f"📁 Ignored: {path} (extension non supportée: {ext})")
                continue

            if len((text or "").strip()) < 50:  # ✅ Ignorer les fichiers trop courts
                _append_log(job_id, f"📄 Ignored: {path} (texte trop court: {len((text or '').strip())} chars)")
                continue

            _append_log(job_id, f"📄 Processing: {path} ({len(text)} chars)")

            # --- traitement spécial JSON / NDJSON ---
            if ext in {".json"} or path.lower().endswith(".ndjson"):
                handled = False
                try:
                    parsed = json.loads(text)
                    # si c'est une liste -> indexer chaque entrée séparément
                    if isinstance(parsed, list):
                        for idx, obj in enumerate(parsed):
                            if isinstance(obj, dict):
                                s = " ".join(str(v) for v in obj.values() if isinstance(v, (str, int, float)))
                            else:
                                s = str(obj)
                            s = _clean_chunk_text(s)
                            if len(s) < 30:
                                continue
                            # dedup global intra-job
                            chash = hashlib.blake2b(s.encode("utf-8", "ignore"), digest_size=8).hexdigest()
                            if chash in seen_chunk_hashes:
                                continue
                            seen_chunk_hashes.add(chash)

                            meta = {"path": path, "chunk": idx, "start": 0, "end": len(s)}
                            if req.store_text:
                                meta["text"] = s
                            buf_chunks.append(s); buf_metas.append(meta)
                            if len(buf_chunks) >= req.batch_size:
                                _flush()
                        handled = True
                    elif isinstance(parsed, dict):
                        s = " ".join(str(v) for v in parsed.values() if isinstance(v, (str, int, float)))
                        s = _clean_chunk_text(s)
                        if len(s) >= 30:
                            chash = hashlib.blake2b(s.encode("utf-8", "ignore"), digest_size=8).hexdigest()
                            if chash not in seen_chunk_hashes:
                                seen_chunk_hashes.add(chash)
                                meta = {"path": path, "chunk": 0, "start": 0, "end": len(s)}
                                if req.store_text:
                                    meta["text"] = s
                                buf_chunks.append(s); buf_metas.append(meta)
                                if len(buf_chunks) >= req.batch_size:
                                    _flush()
                        handled = True
                except Exception:
                    # fallback NDJSON: une ligne == un JSON ou texte
                    try:
                        lines = [L for L in (text or "").splitlines() if L.strip()]
                        for li, line in enumerate(lines):
                            try:
                                obj = json.loads(line)
                                if isinstance(obj, dict):
                                    s = " ".join(str(v) for v in obj.values() if isinstance(v, (str, int, float)))
                                else:
                                    s = str(obj)
                                s = _clean_chunk_text(s)
                                if len(s) < 30:
                                    continue
                                chash = hashlib.blake2b(s.encode("utf-8", "ignore"), digest_size=8).hexdigest()
                                if chash in seen_chunk_hashes:
                                    continue
                                seen_chunk_hashes.add(chash)
                                meta = {"path": path, "chunk": li, "start": 0, "end": len(s)}
                                if req.store_text:
                                    meta["text"] = s
                                buf_chunks.append(s); buf_metas.append(meta)
                                if len(buf_chunks) >= req.batch_size:
                                    _flush()
                            except Exception:
                                # ligne non JSON -> indexer comme texte si longue
                                sl = (line or "").strip()
                                if len(sl) >= 30:
                                    sl = _clean_chunk_text(sl)
                                    chash = hashlib.blake2b(sl.encode("utf-8", "ignore"), digest_size=8).hexdigest()
                                    if chash in seen_chunk_hashes:
                                        continue
                                    seen_chunk_hashes.add(chash)
                                    meta = {"path": path, "chunk": li, "start": 0, "end": len(sl)}
                                    if req.store_text:
                                        meta["text"] = sl
                                    buf_chunks.append(sl); buf_metas.append(meta)
                                    if len(buf_chunks) >= req.batch_size:
                                        _flush()
                        handled = True
                    except Exception:
                        handled = False

                if handled:
                    _flush()
                    _append_log(job_id, f"File done: {path}")
                    continue  # passe au fichier suivant

            # --- traitement normal pour fichiers texte ---
            for ci, (start, end, chunk_txt) in enumerate(_chunk_with_spans(text or "", req.chunk_size, req.overlap)):
                chunk_txt = (chunk_txt or "").strip()
                if len(chunk_txt) < 30:  # ✅ Ignorer les chunks trop courts
                    continue
                # nettoyage pour éviter artefacts JSON / timestamps
                chunk_txt = _clean_chunk_text(chunk_txt)
                if len(chunk_txt) < 30:
                    continue

                # dedup global intra-job (empêche répétitions)
                chash = hashlib.blake2b(chunk_txt.encode("utf-8", "ignore"), digest_size=8).hexdigest()
                if chash in seen_chunk_hashes:
                    continue
                seen_chunk_hashes.add(chash)

                buf_chunks.append(chunk_txt)
                meta = {
                    "path": path,
                    "chunk": ci,
                    "start": start,
                    "end": end,
                }
                if req.store_text:
                    meta["text"] = chunk_txt
                buf_metas.append(meta)

                if len(buf_chunks) >= req.batch_size:
                    _flush()

            # flush fin de fichier
            _flush()
            _append_log(job_id, f"File done: {path}")

        _append_log(job_id, f"Done. chunks={total_chunks}")
        _set_status(job_id, "done")
        LOG.info(f"[{job_id}] Index finished. chunks={total_chunks}")

    except Exception as e:
        LOG.exception("Index job failed")
        _append_log(job_id, f"ERROR: {e}")
        _set_status(job_id, "error")

# ======================================================================================
# API
# ======================================================================================

app = FastAPI()

@app.get("/")
def root():
    return {
        "ok": True,
        "service": "remote-indexer",
        "backends": EMB_BACKEND_ORDER,
        "hf_url_pipeline": HF_URL_PIPE if "hf" in EMB_BACKEND_ORDER else None,
        "hf_url_models": HF_URL_MODL if "hf" in EMB_BACKEND_ORDER else None,
        "di_url": DI_URL if "deepinfra" in EMB_BACKEND_ORDER else None,
        "di_model": DI_MODEL if "deepinfra" in EMB_BACKEND_ORDER else None,
        "vector_store": VECTOR_STORE,
        "vector_store_active": "QdrantStore" if isinstance(STORE, QdrantStore) else "MemoryStore",
        "qdrant_deterministic_ids": QDRANT_DETERMINISTIC_IDS,
        "qdrant_id_mode": QDRANT_ID_MODE,
        "wipe_before_index": WIPE_BEFORE_INDEX,
        "docs": "/health, /index, /status/{job_id} | /status?job_id= | POST /status, /query, /wipe",
    }

@app.get("/health")
def health():
    return {"ok": True, "store": "QdrantStore" if isinstance(STORE, QdrantStore) else "MemoryStore"}

def _check_backend_ready():
    if "hf" in EMB_BACKEND_ORDER and not HF_TOKEN:
        raise HTTPException(400, "HF_API_TOKEN manquant côté serveur (backend=hf).")
    if "deepinfra" in EMB_BACKEND_ORDER and not DI_TOKEN and EMB_BACKEND_ORDER == ["deepinfra"]:
        raise HTTPException(400, "DEEPINFRA_API_KEY manquant côté serveur (backend=deepinfra).")

@app.post("/index")
def start_index(req: IndexRequest, background_tasks: BackgroundTasks, x_auth_token: Optional[str] = Header(default=None)):
    _auth(x_auth_token)
    _check_backend_ready()
    job_id = uuid.uuid4().hex[:12]
    JOBS[job_id] = {"status": "queued", "logs": [], "created": time.time()}
    LOG.info(f"Created job {job_id} for project {req.project_id}")
    _append_log(job_id, f"Job created: {job_id} project={req.project_id}")
    background_tasks.add_task(run_index_job, job_id, req)
    return {"job_id": job_id}

# --- 3 variantes pour /status ---
@app.get("/status/{job_id}")
def status_path(job_id: str, x_auth_token: Optional[str] = Header(default=None)):
    _auth(x_auth_token)
    j = JOBS.get(job_id)
    if not j:
        # Response JSON plus explicite pour faciliter le debug côté client
        raise HTTPException(status_code=404, detail={"error": "job inconnu", "advice": "POST /index to create a new job"})
    return {"status": j["status"], "logs": j["logs"][-1500:]}

@app.get("/status")
def status_query(job_id: str = Query(...), x_auth_token: Optional[str] = Header(default=None)):
    return status_path(job_id, x_auth_token)

@app.post("/status")
def status_post(body: StatusBody, x_auth_token: Optional[str] = Header(default=None)):
    return status_path(body.job_id, x_auth_token)

@app.post("/query")
def query(req: QueryRequest, x_auth_token: Optional[str] = Header(default=None)):
    _auth(x_auth_token)
    _check_backend_ready()
    vecs, _ = _post_embeddings([req.query])
    col = f"proj_{req.project_id}"
    try:
        results = STORE.search(col, vecs[0], int(req.top_k))
    except Exception as e:
        raise HTTPException(400, f"Search failed: {e}")
    out = []
    for pl in results:
        txt = pl.get("text")
        if txt and len(txt) > 800:
            txt = txt[:800] + "..."
        out.append({
            "path": pl.get("path"),
            "chunk": pl.get("chunk"),
            "start": pl.get("start"),
            "end": pl.get("end"),
            "text": txt,
            "score": float(pl.get("_score")) if pl.get("_score") is not None else None
        })
    return {"results": out}

@app.post("/wipe")
def wipe_collection(project_id: str, x_auth_token: Optional[str] = Header(default=None)):
    _auth(x_auth_token)
    col = f"proj_{project_id}"
    try:
        STORE.wipe(col); return {"ok": True}
    except Exception as e:
        raise HTTPException(400, f"wipe failed: {e}")

# ======================================================================================
# Entrypoint
# ======================================================================================

if __name__ == "__main__":
    import uvicorn
    port = int(os.getenv("PORT", "7860"))
    LOG.info(f"===== Application Startup on PORT {port} =====")
    uvicorn.run(app, host="0.0.0.0", port=port)