#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
app/core/chunk_payload.py  (Mindnet V2 — robust)

Aufgabe
-------
Erzeugt Chunk-Payloads aus den vom Chunker gelieferten "Chunk"-Objekten.
- Spiegelt `retriever_weight` und `chunk_profile` in **jedem** Chunk-Payload.
- Werteauflösung: Frontmatter > types.yaml > Defaults.
- Lädt `config/types.yaml` selbst, wenn `types_cfg` nicht übergeben wurde.

Eingang
-------
- note: Dict mit mind. { frontmatter: {...}, id, type, title, path }
- note_path: Pfad der Note (für Payload-Feld `path`)
- chunks_from_chunker: Liste von Objekten mit Attributen/Feldern:
  id, note_id, index, text, window, neighbors_prev, neighbors_next
- note_text: voller Text der Note (optional, kann leer sein)
- types_cfg: optional; wenn None → config wird intern geladen
- file_path: optional, für Debug/Tracing im Payload

Ausgang (pro Chunk)
-------------------
- Pflichtfelder: note_id, chunk_id, index (0-basiert), ord (1-basiert), type, tags
- Texte: text, window
- Nachbarn: neighbors_prev, neighbors_next
- Spiegelungen: retriever_weight, chunk_profile
- Meta: source_path, path, section (leer), created/updated opt. aus Frontmatter

"""
from __future__ import annotations
from typing import Any, Dict, List, Optional
import os, yaml

def _env(n: str, d: Optional[str]=None) -> str:
    v = os.getenv(n)
    return v if v is not None else (d or "")

def _deep_get(root: Any, path: str) -> Any:
    cur = root
    for key in path.split("."):
        if not isinstance(cur, dict) or key not in cur:
            return None
        cur = cur[key]
    return cur

def _as_float(x: Any):
    try:
        return float(x)
    except Exception:
        return None

def _load_types_local() -> dict:
    p = _env("MINDNET_TYPES_FILE", "./config/types.yaml")
    try:
        with open(p, "r", encoding="utf-8") as f:
            return yaml.safe_load(f) or {}
    except Exception:
        return {}

def _effective_chunk_profile(note_type: str, fm: Dict[str, Any], reg: dict) -> Optional[str]:
    # Frontmatter zuerst
    if isinstance(fm.get("chunk_profile"), str):
        return fm.get("chunk_profile")
    # Registry
    types = reg.get("types") if isinstance(reg.get("types"), dict) else reg
    if isinstance(types, dict):
        v = types.get(note_type, {})
        if isinstance(v, dict):
            cp = v.get("chunk_profile")
            if isinstance(cp, str):
                return cp
    return None

def _effective_retriever_weight(note_type: str, fm: Dict[str, Any], reg: dict) -> float:
    # Frontmatter zuerst
    if fm.get("retriever_weight") is not None:
        v = _as_float(fm.get("retriever_weight"))
        if v is not None:
            return float(v)
    # Registry-Pfade
    types = reg.get("types") if isinstance(reg.get("types"), dict) else reg
    candidates = [
        f"{note_type}.retriever_weight",
        f"{note_type}.retriever.weight",
        f"{note_type}.retrieval.weight",
        "defaults.retriever_weight",
        "defaults.retriever.weight",
        "global.retriever_weight",
        "global.retriever.weight",
    ]
    for path in candidates:
        # Wenn types == reg-root (flatten), erlauben sowohl "types.X" als auch "X"
        val = _deep_get(types, path) if "." in path else (types.get(path) if isinstance(types, dict) else None)
        if val is None and isinstance(reg, dict):
            # versuche absolute Pfade
            val = _deep_get(reg, f"types.{path}")
        v = _as_float(val)
        if v is not None:
            return float(v)
    return 1.0

def make_chunk_payloads(note: Dict[str, Any],
                        note_path: str,
                        chunks_from_chunker: List[Any],
                        *,
                        note_text: str = "",
                        types_cfg: Optional[dict] = None,
                        file_path: Optional[str] = None) -> List[Dict[str, Any]]:
    fm = (note or {}).get("frontmatter", {})
    note_type = fm.get("type") or note.get("type") or "concept"
    reg = types_cfg if isinstance(types_cfg, dict) else _load_types_local()

    # Effektive Werte bestimmen
    cp = _effective_chunk_profile(note_type, fm, reg)
    rw = _effective_retriever_weight(note_type, fm, reg)

    tags = fm.get("tags") or []
    if isinstance(tags, str):
        tags = [tags]

    out: List[Dict[str, Any]] = []

    for idx, ch in enumerate(chunks_from_chunker):
        # Chunk-Grunddaten (Attribute oder Keys)
        cid = getattr(ch, "id", None) or (ch.get("id") if isinstance(ch, dict) else None)
        nid = getattr(ch, "note_id", None) or (ch.get("note_id") if isinstance(ch, dict) else fm.get("id"))
        index = getattr(ch, "index", None) or (ch.get("index") if isinstance(ch, dict) else idx)
        text = getattr(ch, "text", None) or (ch.get("text") if isinstance(ch, dict) else "")
        window = getattr(ch, "window", None) or (ch.get("window") if isinstance(ch, dict) else text)
        prev_id = getattr(ch, "neighbors_prev", None) or (ch.get("neighbors_prev") if isinstance(ch, dict) else None)
        next_id = getattr(ch, "neighbors_next", None) or (ch.get("neighbors_next") if isinstance(ch, dict) else None)

        pl: Dict[str, Any] = {
            "note_id": nid,
            "chunk_id": cid,
            "index": int(index),
            "ord": int(index) + 1,
            "type": note_type,
            "tags": tags,
            "text": text,
            "window": window,
            "neighbors_prev": prev_id,
            "neighbors_next": next_id,
            "section": getattr(ch, "section", None) or (ch.get("section") if isinstance(ch, dict) else ""),
            "path": note_path,
            "source_path": file_path or note_path,
            "retriever_weight": float(rw),
        }
        if cp is not None:
            pl["chunk_profile"] = cp

        # Aufräumen: keine historischen Aliasfelder
        for alias in ("chunk_num", "Chunk_Number"):
            if alias in pl:
                pl.pop(alias, None)

        out.append(pl)

    return out