# app/core/chunk_payload.py
# Line count: 214

from __future__ import annotations

from typing import Any, Dict, Iterable, List, Optional, Tuple, Union


def _get(obj: Any, key: str, default: Any = None) -> Any:
    if obj is None:
        return default
    if hasattr(obj, key):
        try:
            val = getattr(obj, key)
            return val if val is not None else default
        except Exception:
            pass
    if isinstance(obj, dict):
        if key in obj:
            val = obj.get(key, default)
            return val if val is not None else default
    return default


def _get_frontmatter(note: Any) -> Dict[str, Any]:
    fm = _get(note, "frontmatter", None)
    if isinstance(fm, dict):
        return fm
    meta = _get(note, "meta", None)
    if isinstance(meta, dict) and isinstance(meta.get("frontmatter"), dict):
        return meta["frontmatter"]
    return {}


def _get_from_frontmatter(fm: Dict[str, Any], key: str, default: Any = None) -> Any:
    if not isinstance(fm, dict):
        return default
    if key in fm:
        val = fm.get(key, default)
        return val if val is not None else default
    return default


def _coerce_tags(val: Any) -> List[str]:
    if val is None:
        return []
    if isinstance(val, list):
        return [str(x) for x in val]
    if isinstance(val, str):
        parts = [t.strip() for t in val.split(",")]
        return [p for p in parts if p]
    return []


def _resolve_retriever_weight(
    fm: Dict[str, Any],
    explicit: Optional[float],
) -> Optional[float]:
    if explicit is not None:
        return explicit
    val = _get_from_frontmatter(fm, "retriever_weight", None)
    if isinstance(val, (int, float)):
        return float(val)
    retr = fm.get("retriever")
    if isinstance(retr, dict):
        v = retr.get("weight")
        if isinstance(v, (int, float)):
            return float(v)
    return None


def _resolve_note_fields(note: Any) -> Dict[str, Any]:
    fm = _get_frontmatter(note)

    note_id = _get_from_frontmatter(fm, "id", None)
    if note_id is None:
        note_id = _get(note, "note_id", None)
    if note_id is None:
        note_id = _get(note, "id", None)

    title = _get_from_frontmatter(fm, "title", None)
    if title is None:
        title = _get(note, "title", None)

    ntype = _get_from_frontmatter(fm, "type", None)
    if ntype is None:
        ntype = _get(note, "type", None)

    tags = _get_from_frontmatter(fm, "tags", None)
    if tags is None:
        tags = _get(note, "tags", None)
    tags = _coerce_tags(tags)

    path = _get_from_frontmatter(fm, "path", None)
    if path is None:
        path = _get(note, "path", None)
    if path is None:
        path = _get(note, "source", None)
    if path is None:
        path = _get(note, "filepath", None)

    return {
        "note_id": note_id,
        "title": title,
        "type": ntype,
        "tags": tags,
        "path": path,
        "frontmatter": fm,
    }


def _extract_chunk_text_and_index(
    chunk: Any,
    fallback_index: int,
) -> Tuple[str, int]:
    """
    Akzeptiert verschiedene Chunk-Formate:
    - str (reiner Text)
    - dict mit keys: text | window | body | content
    - Objekt mit Attributen: text | window | body | content
    - (text, idx) Tuple
    """
    # Tuple (text, idx)
    if isinstance(chunk, tuple) and len(chunk) == 2 and isinstance(chunk[0], str):
        txt, idx = chunk
        try:
            idx_int = int(idx)
        except Exception:
            idx_int = fallback_index
        return txt, idx_int

    # String
    if isinstance(chunk, str):
        return chunk, fallback_index

    # Dict
    if isinstance(chunk, dict):
        txt = (
            chunk.get("text")
            or chunk.get("window")
            or chunk.get("body")
            or chunk.get("content")
        )
        if isinstance(txt, str):
            idx = chunk.get("index")
            try:
                idx_int = int(idx) if idx is not None else fallback_index
            except Exception:
                idx_int = fallback_index
            return txt, idx_int

    # Objekt mit Attributen
    for attr in ("text", "window", "body", "content"):
        if hasattr(chunk, attr):
            try:
                txt = getattr(chunk, attr)
            except Exception:
                txt = None
            if isinstance(txt, str):
                # Optionale "index"-Quelle
                idx = None
                if hasattr(chunk, "index"):
                    try:
                        idx = getattr(chunk, "index")
                    except Exception:
                        idx = None
                try:
                    idx_int = int(idx) if idx is not None else fallback_index
                except Exception:
                    idx_int = fallback_index
                return txt, idx_int

    # Wenn nichts passt -> klarer Fehler
    raise ValueError("Unsupported chunk format: cannot extract text/index")


def make_chunk_payloads(
    note: Any,
    chunks: Iterable[Any],
    *,
    retriever_weight: Optional[float] = None,
    base_payload: Optional[Dict[str, Any]] = None,
) -> List[Dict[str, Any]]:
    """
    Erzeugt Qdrant-Payloads für Chunk-Punkte.
    - Kopiert Note-Metadaten (note_id/title/type/tags/path)
    - Schreibt text + chunk_index je Chunk
    - Setzt retriever_weight, wenn vorhanden/angegeben
    """
    out: List[Dict[str, Any]] = []
    note_fields = _resolve_note_fields(note)
    fm = note_fields["frontmatter"]
    rw = _resolve_retriever_weight(fm, retriever_weight)

    # Basisfelder, die jeder Chunk tragen soll
    common: Dict[str, Any] = {}
    if base_payload:
        common.update({k: v for k, v in base_payload.items() if v is not None})

    if note_fields.get("note_id") is not None:
        common["note_id"] = note_fields["note_id"]
    if note_fields.get("title") is not None:
        common["title"] = note_fields["title"]
    if note_fields.get("type") is not None:
        common["type"] = note_fields["type"]
    if note_fields.get("tags"):
        common["tags"] = note_fields["tags"]
    if note_fields.get("path") is not None:
        common["path"] = note_fields["path"]
    if rw is not None:
        common["retriever_weight"] = rw

    for i, ch in enumerate(chunks):
        text, idx = _extract_chunk_text_and_index(ch, i)
        payload = dict(common)  # copy
        payload["chunk_index"] = idx
        payload["text"] = text
        out.append(payload)

    return out