"""
note_payload.py — mindnet core payload builders
Version: 1.3.1 (2025-11-08)

Purpose
-------
Build a robust, forward-compatible note payload for Qdrant upserts.
This module is intentionally defensive:
- Accepts both dict-like "parsed note" objects and dataclass/objects with attributes.
- Tolerates extra kwargs from different callers (e.g., `vault_root`, `prefix`, etc.).
- Ensures `retriever_weight` is resolved and present in the payload if available.

Contract
--------
make_note_payload(note, **kwargs) -> Dict[str, Any]

Expected minimal fields in returned payload:
- note_id (str)
- title (str)
- type (str)
- path (str or None)  # relative to vault_root when provided
- tags (List[str])
- retriever_weight (float or None)  # if available
"""
from __future__ import annotations

from pathlib import Path
from typing import Any, Dict, Iterable, List, Mapping, Optional, Union


def _get(obj: Any, key: str, default: Any = None) -> Any:
    """Try to read `key` from mapping or attribute; else default."""
    if obj is None:
        return default
    if isinstance(obj, Mapping):
        return obj.get(key, default)
    # attribute access
    return getattr(obj, key, default)


def _get_frontmatter(note: Any) -> Mapping[str, Any]:
    fm = _get(note, "frontmatter", {})
    if isinstance(fm, Mapping):
        return fm
    return {}  # be safe


def _resolve_retriever_weight(explicit: Any, fm: Mapping[str, Any]) -> Optional[float]:
    """
    Priority:
    1) explicit kwarg retriever_weight
    2) frontmatter['retriever_weight']
    3) frontmatter['retriever']['weight']
    """
    def to_float(v: Any) -> Optional[float]:
        try:
            if v is None:
                return None
            return float(v)
        except Exception:
            return None

    if explicit is not None:
        return to_float(explicit)

    if "retriever_weight" in fm:
        return to_float(fm.get("retriever_weight"))

    retr = fm.get("retriever")
    if isinstance(retr, Mapping) and "weight" in retr:
        return to_float(retr.get("weight"))

    return None


def _to_rel_path(abs_path: Optional[Union[str, Path]], vault_root: Optional[Union[str, Path]]) -> Optional[str]:
    if abs_path is None:
        return None
    try:
        p = Path(abs_path)
        if vault_root:
            try:
                rp = p.relative_to(Path(vault_root))
                return str(rp)
            except Exception:
                return str(p)
        return str(p)
    except Exception:
        return str(abs_path)


def make_note_payload(
    note: Any,
    *args,  # tolerate older/other callers
    **kwargs: Any,
) -> Dict[str, Any]:
    """
    Build a normalized note payload for Qdrant.
    Unknown kwargs are ignored to keep the function forward-compatible.

    Recognized kwargs:
    - vault_root: base path to make `path` relative (optional)
    - retriever_weight: explicit override (optional)
    """
    vault_root = kwargs.get("vault_root")
    explicit_weight = kwargs.get("retriever_weight")

    fm = _get_frontmatter(note)

    note_id = _get(note, "note_id") or _get(note, "id")
    if not note_id:
        # Try from frontmatter
        note_id = fm.get("id")

    title = _get(note, "title") or fm.get("title")
    ntype = _get(note, "type") or fm.get("type")

    tags = _get(note, "tags") or fm.get("tags") or []
    if not isinstance(tags, list):
        tags = list(tags) if tags else []

    path_val = _get(note, "path") or _get(note, "abs_path") or fm.get("path")

    payload: Dict[str, Any] = {
        "note_id": note_id,
        "title": title,
        "type": ntype,
        "tags": tags,
        "path": _to_rel_path(path_val, vault_root),
        "retriever_weight": _resolve_retriever_weight(explicit_weight, fm),
    }

    # Also surface explicit frontmatter fields (non-conflicting) if present
    for k in ("status", "created", "updated"):
        v = fm.get(k)
        if v is not None and k not in payload:
            payload[k] = v

    return payload