#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
app/core/note_payload.py  (Mindnet V2 — types.yaml authoritative)
- retriever_weight und chunk_profile werden aus config/types.yaml gelesen.
- Reihenfolge: types.<type>  >  defaults.*  >  Fallbacks (1.0 / "default").
- Frontmatter-Overrides für diese beiden Felder werden bewusst IGNORIERT.
- edge_defaults (falls in types.yaml definiert) werden in die Note-Payload gespiegelt.
- MINDNET_TYPES_FILE kann absoluten Pfad liefern, sonst ./config/types.yaml.
"""

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

# ----------------------- helpers -----------------------

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

def _load_types() -> 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 _get_types_map(reg: dict) -> dict:
    if isinstance(reg, dict) and isinstance(reg.get("types"), dict):
        return reg["types"]
    return reg if isinstance(reg, dict) else {}

def _get_defaults(reg: dict) -> dict:
    if isinstance(reg, dict) and isinstance(reg.get("defaults"), dict):
        return reg["defaults"]
    # alias "global" erlaubt
    if isinstance(reg, dict) and isinstance(reg.get("global"), dict):
        return reg["global"]
    return {}

def _resolve_chunk_profile(note_type: str, reg: dict) -> str:
    types = _get_types_map(reg)
    if isinstance(types, dict):
        t = types.get(note_type, {})
        if isinstance(t, dict) and isinstance(t.get("chunk_profile"), str):
            return t["chunk_profile"]
    defs = _get_defaults(reg)
    if isinstance(defs, dict) and isinstance(defs.get("chunk_profile"), str):
        return defs["chunk_profile"]
    return "default"

def _as_float(x: Any) -> Optional[float]:
    try:
        return float(x)
    except Exception:
        return None

def _resolve_retriever_weight(note_type: str, reg: dict) -> float:
    types = _get_types_map(reg)
    if isinstance(types, dict):
        t = types.get(note_type, {})
        if isinstance(t, dict) and (t.get("retriever_weight") is not None):
            v = _as_float(t.get("retriever_weight"))
            if v is not None:
                return float(v)
    defs = _get_defaults(reg)
    if isinstance(defs, dict) and (defs.get("retriever_weight") is not None):
        v = _as_float(defs.get("retriever_weight"))
        if v is not None:
            return float(v)
    return 1.0

# ------------------- public API -------------------

def make_note_payload(parsed_note: Any,
                      *,
                      vault_root: str,
                      hash_mode: str = "body",
                      hash_normalize: str = "canonical",
                      hash_source: str = "parsed",
                      file_path: Optional[str] = None) -> Dict[str, Any]:
    """
    Erwartet ein Parsed-Objekt mit Attributen:
      - frontmatter (dict)
      - body (str)
      - path (optional)
    Liefert Note-Payload mit deterministischer note_id und Typ-Werten aus types.yaml.
    """
    fm = (getattr(parsed_note, "frontmatter", None) or {}) if parsed_note else {}
    title = fm.get("title") or ""
    note_type = fm.get("type") or "concept"
    note_id = fm.get("id") or _stable_id_from_path_or_title(file_path or "", title)
    tags = fm.get("tags") or []
    if isinstance(tags, str):
        tags = [tags]

    # types.yaml authoritative:
    reg = _load_types()
    chunk_profile = _resolve_chunk_profile(note_type, reg)
    retriever_weight = _resolve_retriever_weight(note_type, reg)
    # edge_defaults (falls vorhanden)
    edge_defaults = None
    types = _get_types_map(reg)
    if isinstance(types, dict):
        t = types.get(note_type, {})
        if isinstance(t, dict) and isinstance(t.get("edge_defaults"), list):
            edge_defaults = t["edge_defaults"]

    updated = _ts_to_int(fm.get("updated"))

    payload: Dict[str, Any] = {
        "note_id": note_id,
        "type": note_type,
        "title": title,
        "tags": tags,
        "updated": updated if updated is not None else 0,
        "path": file_path or "",
        "chunk_profile": chunk_profile,
        "retriever_weight": float(retriever_weight),
    }
    if edge_defaults is not None:
        payload["edge_defaults"] = edge_defaults

    return payload

# ------------------- internal utilities -------------------

def _stable_id_from_path_or_title(path: str, title: str) -> str:
    base = path or title or ""
    if not base:
        base = "note"
    h = hashlib.sha1(base.encode("utf-8")).hexdigest()[:6]
    # title-sourced; in V2 typischerweise durch Frontmatter id ersetzt
    return f"auto-{h}"

def _ts_to_int(val: Any) -> Optional[int]:
    # akzeptiert YYYY-MM-DD oder epoch int; None bei Fehler
    if val is None:
        return None
    if isinstance(val, int):
        return val
    if isinstance(val, float):
        return int(val)
    if isinstance(val, str):
        val = val.strip()
        # YYYY-MM-DD
        try:
            dt = datetime.date.fromisoformat(val)
            return int(datetime.datetime(dt.year, dt.month, dt.day).timestamp())
        except Exception:
            pass
        # epoch string
        try:
            return int(val)
        except Exception:
            return None
    return None