#!/usr/bin/env python3
"""Enricher split_words — tokeniza texto en palabras (regex puro, offline).

Pensado para probar el grouping de issue 0035 con volumen alto: cualquier
parrafo decente supera el umbral de 50 trivialmente, asi se ve un Group
cuadrado por flujo.

Wire protocol estandar (issue 0026):
  - stdin:  JSON con node_id, node_name, metadata, ops_db_path, app_dir,
            cache_dir, registry_root, params.
  - stderr: lineas `PROGRESS:<float> <stage>` para feedback de UI.
  - stdout: una linea JSON al final con resumen.
  - exit code 0 = ok, !=0 = error.

Lectura del texto (igual que split_sentences):
  1. `entities.notes`  (panel Note del Inspector).
  2. node_name         (fallback minimo).

Tokenizacion: split por whitespace + puntuacion, lowercased. Filtra
tokens con `len < min_length` para evitar ruido (a, el, de, y, o, ...).
Por defecto deduplica para devolver vocabulario unico (mas util para
explorar contenido); con `dedupe=false` cada ocurrencia es un nodo
(util para volumen / stress).

Grouping (issue 0035c): mismo patron que split_sentences y web_search.
"""
from __future__ import annotations

import json
import os
import re
import sqlite3
import sys
import time
import uuid
from datetime import datetime, timezone


DEFAULT_GROUP_THRESHOLD = 50
GROUP_PREVIEW_K         = 10


def _coerce_threshold(raw, default: int) -> int:
    """Acepta int / str numerico / None, devuelve >0 o el default (issue 0035e)."""
    if raw is None or raw == "":
        return default
    try:
        v = int(raw)
    except (TypeError, ValueError):
        return default
    return v if v > 0 else default

# Tokenizer: secuencias de letras (incluye acentos espanyoles + apostrofo
# interno tipo "don't"). Mas robusto que split por espacios para texto
# real con puntuacion adyacente. Numeros se ignoran — pensado para
# contenido natural, no datos.
_TOKEN_RE = re.compile(r"[A-Za-zÁÉÍÓÚÜÑáéíóúüñ][A-Za-zÁÉÍÓÚÜÑáéíóúüñ'-]*")


def progress(p: float, stage: str = "") -> None:
    sys.stderr.write(f"PROGRESS:{p:.2f} {stage}\n")
    sys.stderr.flush()


def log(msg: str) -> None:
    sys.stderr.write(f"{msg}\n")
    sys.stderr.flush()


def now_iso() -> str:
    return datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")


def now_ms() -> int:
    return int(time.time() * 1000)


def has_group_id_column(conn: sqlite3.Connection) -> bool:
    try:
        cur = conn.execute("PRAGMA table_info(entities)")
        for row in cur:
            if row[1] == "group_id":
                return True
    except sqlite3.Error:
        pass
    return False


def read_text(ops_db_path: str, node_id: str, node_name: str) -> str:
    notes = ""
    try:
        c = sqlite3.connect(ops_db_path)
        try:
            row = c.execute(
                "SELECT notes FROM entities WHERE id=?", (node_id,)
            ).fetchone()
            if row and isinstance(row[0], str):
                notes = row[0]
        finally:
            c.close()
    except sqlite3.Error:
        notes = ""
    if notes and notes.strip():
        return notes.strip()
    return (node_name or "").strip()


def tokenize(text: str, *, min_length: int, dedupe: bool) -> list[str]:
    """Devuelve lista de tokens (lower) filtrados por min_length.

    Si `dedupe=True`, conserva solo la primera aparicion (preserva orden).
    """
    seen: set[str] = set()
    out: list[str] = []
    for m in _TOKEN_RE.finditer(text):
        tok = m.group(0).lower()
        if len(tok) < min_length:
            continue
        if dedupe:
            if tok in seen:
                continue
            seen.add(tok)
        out.append(tok)
    return out


def insert_word(conn: sqlite3.Connection, *, word: str, rank: int,
                  batch_id: str, group_id: str | None,
                  has_group_col: bool) -> str:
    ts = now_iso()
    new_id = f"Word_{now_ms()}_{rank}"
    meta = {
        "word":     word,
        "rank":     rank,
        "batch_id": batch_id,
    }
    meta_json = json.dumps(meta, ensure_ascii=False)
    if has_group_col:
        conn.execute(
            "INSERT INTO entities (id, name, type_ref, source, metadata, "
            " group_id, created_at, updated_at) "
            "VALUES (?, ?, 'Word', 'enricher:split_words', ?, ?, ?, ?)",
            (new_id, word, meta_json, group_id, ts, ts),
        )
    else:
        conn.execute(
            "INSERT INTO entities (id, name, type_ref, source, metadata, "
            " created_at, updated_at) "
            "VALUES (?, ?, 'Word', 'enricher:split_words', ?, ?, ?)",
            (new_id, word, meta_json, ts, ts),
        )
    return new_id


def insert_group_entity(conn: sqlite3.Connection, *, source_node_id: str,
                         source_node_name: str, count: int,
                         batch_id: str) -> str:
    ts = now_iso()
    new_id = f"Group_{now_ms()}_{abs(hash(source_node_id + batch_id)) % 100000}"
    name = f"split_words: {source_node_name} ({count})"
    meta = {
        "enricher":       "split_words",
        "count":          count,
        "batch_id":       batch_id,
        "source_node_id": source_node_id,
    }
    meta_json = json.dumps(meta, ensure_ascii=False)
    conn.execute(
        "INSERT INTO entities (id, name, type_ref, source, metadata, "
        " created_at, updated_at) "
        "VALUES (?, ?, 'Group', 'enricher:split_words', ?, ?, ?)",
        (new_id, name, meta_json, ts, ts),
    )
    return new_id


_REL_COUNTER = 0


def insert_relation(conn: sqlite3.Connection, from_id: str, to_id: str,
                    name: str) -> bool:
    global _REL_COUNTER
    cur = conn.execute(
        "SELECT 1 FROM relations WHERE from_entity=? AND to_entity=? "
        "AND name=? LIMIT 1",
        (from_id, to_id, name),
    )
    if cur.fetchone():
        return False
    ts = now_iso()
    _REL_COUNTER += 1
    rel_id = f"rel_{now_ms()}_{_REL_COUNTER}_{name.lower()}"
    conn.execute(
        "INSERT INTO relations (id, name, from_entity, to_entity, "
        " created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?)",
        (rel_id, name, from_id, to_id, ts, ts),
    )
    return True


def main() -> int:
    raw = sys.stdin.read()
    try:
        ctx = json.loads(raw)
    except Exception as e:
        log(f"stdin not valid JSON: {e}")
        return 2

    node_id     = ctx.get("node_id") or ""
    node_name   = (ctx.get("node_name") or "").strip()
    ops_db_path = ctx.get("ops_db_path") or ""
    params      = ctx.get("params") or {}
    max_words   = int(params.get("max_words", 500))
    min_length  = int(params.get("min_length", 3))
    dedupe_raw  = params.get("dedupe", True)
    if isinstance(dedupe_raw, str):
        dedupe = dedupe_raw.lower() not in ("false", "0", "no", "")
    else:
        dedupe = bool(dedupe_raw)

    if not node_id or not ops_db_path:
        log("missing node_id / ops_db_path")
        return 2

    ops_db_path = ops_db_path.replace("\\", "/")
    app_dir_raw = (ctx.get("app_dir") or "").replace("\\", "/")
    if not os.path.isabs(ops_db_path):
        if app_dir_raw and os.path.isdir(app_dir_raw):
            cand = os.path.normpath(os.path.join(app_dir_raw, ops_db_path))
            if os.path.exists(cand):
                ops_db_path = cand
        if not os.path.isabs(ops_db_path):
            ops_db_path = os.path.abspath(ops_db_path)

    if not os.path.exists(ops_db_path):
        log(f"ops_db_path no existe: {ops_db_path}")
        print(json.dumps({"error": "ops_db not found",
                          "ops_db_path": ops_db_path,
                          "entities_added": 0, "relations_added": 0}))
        return 7

    progress(0.10, "reading")
    text = read_text(ops_db_path, node_id, node_name)
    # min_length aplica a tokens, no al texto entrante. Para texto entrante
    # exigimos algo razonable: al menos un token posible.
    if len(text.strip()) < min_length:
        msg = (f"texto demasiado corto ({len(text)} chars). Escribe el "
               f"contenido en el panel Note del nodo (doble click) o "
               f"pon un name mas largo.")
        log(msg)
        print(json.dumps({"error": msg, "entities_added": 0,
                          "relations_added": 0}))
        return 2

    progress(0.30, "tokenizing")
    words = tokenize(text, min_length=min_length, dedupe=dedupe)
    if max_words > 0:
        words = words[:max_words]

    if not words:
        msg = (f"sin tokens tras filtrar (texto de {len(text)} chars, "
               f"min_length={min_length}, dedupe={dedupe})")
        log(msg)
        print(json.dumps({"error": msg, "entities_added": 0,
                          "relations_added": 0}))
        return 2

    progress(0.55, "writing")
    conn = sqlite3.connect(ops_db_path)
    conn.execute("PRAGMA foreign_keys=OFF")
    entities_added = 0
    relations_added = 0
    group_id: str | None = None
    batch_id = uuid.uuid4().hex
    try:
        has_group_col = has_group_id_column(conn)
        n_total = len(words)
        # Issue 0035e: respeta override del manifest si viene en ctx.
        threshold = _coerce_threshold(ctx.get("auto_group_threshold"),
                                       DEFAULT_GROUP_THRESHOLD)

        if n_total >= threshold and has_group_col:
            group_id = insert_group_entity(
                conn,
                source_node_id=node_id,
                source_node_name=node_name or "(text)",
                count=n_total,
                batch_id=batch_id,
            )
            entities_added += 1
            if insert_relation(conn, group_id, node_id, "WORD_OF"):
                relations_added += 1
            preview = words[:GROUP_PREVIEW_K]
            grouped = words[GROUP_PREVIEW_K:]
        else:
            preview = words
            grouped = []

        for i, w in enumerate(preview):
            wid = insert_word(
                conn, word=w, rank=i + 1, batch_id=batch_id,
                group_id=None, has_group_col=has_group_col,
            )
            entities_added += 1
            if insert_relation(conn, wid, node_id, "WORD_OF"):
                relations_added += 1

        for j, w in enumerate(grouped):
            rank = GROUP_PREVIEW_K + j + 1
            wid = insert_word(
                conn, word=w, rank=rank, batch_id=batch_id,
                group_id=group_id, has_group_col=has_group_col,
            )
            entities_added += 1
            if insert_relation(conn, wid, node_id, "WORD_OF"):
                relations_added += 1
            if grouped and j % 50 == 0:
                progress(0.55 + 0.40 * (j / max(1, len(grouped))), "writing")

        conn.commit()
    finally:
        conn.close()

    progress(1.0, "done")
    print(json.dumps({
        "words":           len(words),
        "entities_added":  entities_added,
        "relations_added": relations_added,
        "batch_id":        batch_id,
        "group_id":        group_id or "",
        "grouped":         bool(group_id),
        "deduped":         dedupe,
    }, ensure_ascii=False))
    return 0


if __name__ == "__main__":
    sys.exit(main())