"""
FILE: app/core/note_payload.py
DESCRIPTION: Baut das JSON-Objekt. 
FEATURES:
  1. Multi-Hash: Berechnet immer 'body' AND 'full' Hashes für flexible Change Detection.
  2. Config-Fix: Liest korrekt 'chunking_profile' aus types.yaml (statt Legacy 'chunk_profile').
VERSION: 2.3.0
STATUS: Active
DEPENDENCIES: yaml, os, json, pathlib, hashlib
EXTERNAL_CONFIG: config/types.yaml
"""

from __future__ import annotations

from typing import Any, Dict, Tuple, Optional
import os
import json
import pathlib
import hashlib

try:
    import yaml  # type: ignore
except Exception:
    yaml = None


# ---------------------------------------------------------------------------
# Helper
# ---------------------------------------------------------------------------

def _as_dict(x) -> Dict[str, Any]:
    """Versucht, ein ParsedMarkdown-ähnliches Objekt in ein Dict zu überführen."""
    if isinstance(x, dict):
        return dict(x)

    out: Dict[str, Any] = {}
    for attr in (
        "frontmatter",
        "body",
        "id",
        "note_id",
        "title",
        "path",
        "tags",
        "type",
        "created",
        "modified",
        "date",
    ):
        if hasattr(x, attr):
            val = getattr(x, attr)
            if val is not None:
                out[attr] = val

    if not out:
        out["raw"] = str(x)

    return out


def _pick_args(*args, **kwargs) -> Tuple[Optional[str], Optional[dict]]:
    path = kwargs.get("path") or (args[0] if args else None)
    types_cfg = kwargs.get("types_cfg") or kwargs.get("types") or None
    return path, types_cfg


def _env_float(name: str, default: float) -> float:
    try:
        return float(os.environ.get(name, default))
    except Exception:
        return default


def _ensure_list(x) -> list:
    if x is None:
        return []
    if isinstance(x, list):
        return [str(i) for i in x]
    if isinstance(x, (set, tuple)):
        return [str(i) for i in x]
    return [str(x)]

# --- Hash Logic ---
def _compute_hash(content: str) -> str:
    """Berechnet einen SHA-256 Hash für den gegebenen String."""
    if not content:
        return ""
    return hashlib.sha256(content.encode("utf-8")).hexdigest()

def _get_hash_source_content(n: Dict[str, Any], mode: str) -> str:
    """
    Stellt den String zusammen, der gehasht werden soll.
    """
    body = str(n.get("body") or "")
    
    if mode == "body":
        return body
    
    if mode == "full":
        fm = n.get("frontmatter") or {}
        # Wichtig: Sortierte Keys für deterministisches Verhalten!
        # Wir nehmen alle steuernden Metadaten auf
        meta_parts = []
        # Hier checken wir keys, die eine Neu-Indizierung rechtfertigen würden
        for k in sorted(["title", "type", "status", "tags", "chunking_profile", "chunk_profile", "retriever_weight"]):
            val = fm.get(k)
            if val is not None:
                meta_parts.append(f"{k}:{val}")
        
        meta_str = "|".join(meta_parts)
        return f"{meta_str}||{body}"
        
    return body


# ---------------------------------------------------------------------------
# Type-Registry laden
# ---------------------------------------------------------------------------

def _load_types_config(explicit_cfg: Optional[dict] = None) -> dict:
    if explicit_cfg and isinstance(explicit_cfg, dict):
        return explicit_cfg

    path = os.getenv("MINDNET_TYPES_FILE") or "./config/types.yaml"
    if not os.path.isfile(path) or yaml is None:
        return {}

    try:
        with open(path, "r", encoding="utf-8") as f:
            data = yaml.safe_load(f) or {}
        return data if isinstance(data, dict) else {}
    except Exception:
        return {}


def _cfg_for_type(note_type: str, reg: dict) -> dict:
    if not isinstance(reg, dict):
        return {}
    types = reg.get("types") if isinstance(reg.get("types"), dict) else reg
    return types.get(note_type, {}) if isinstance(types, dict) else {}


def _cfg_defaults(reg: dict) -> dict:
    if not isinstance(reg, dict):
        return {}
    for key in ("defaults", "default", "global"):
        v = reg.get(key)
        if isinstance(v, dict):
            return v
    return {}


# ---------------------------------------------------------------------------
# Haupt-API
# ---------------------------------------------------------------------------

def make_note_payload(note: Any, *args, **kwargs) -> Dict[str, Any]:
    """
    Baut das Note-Payload für mindnet_notes auf.
    Inkludiert Hash-Berechnung (Body & Full) und korrigierte Config-Lookups.
    """
    n = _as_dict(note)
    path_arg, types_cfg_explicit = _pick_args(*args, **kwargs)
    reg = _load_types_config(types_cfg_explicit)
    
    # Hash Config (Parameter für Source/Normalize, Mode ist hardcoded auf 'beide')
    hash_source = kwargs.get("hash_source", "parsed")
    hash_normalize = kwargs.get("hash_normalize", "canonical")

    fm = n.get("frontmatter") or {}
    fm_type = fm.get("type") or n.get("type") or "concept"
    note_type = str(fm_type)

    cfg_type = _cfg_for_type(note_type, reg)
    cfg_def = _cfg_defaults(reg)

    # --- retriever_weight ---
    default_rw = _env_float("MINDNET_DEFAULT_RETRIEVER_WEIGHT", 1.0)
    retriever_weight = fm.get("retriever_weight")
    if retriever_weight is None:
        retriever_weight = cfg_type.get(
            "retriever_weight",
            cfg_def.get("retriever_weight", default_rw),
        )
    try:
        retriever_weight = float(retriever_weight)
    except Exception:
        retriever_weight = default_rw

    # --- chunk_profile (FIXED LOGIC) ---
    # 1. Frontmatter Override (beide Schreibweisen erlaubt)
    chunk_profile = fm.get("chunking_profile") or fm.get("chunk_profile")
    
    # 2. Type Config (Korrekter Key 'chunking_profile' aus types.yaml)
    if chunk_profile is None:
        chunk_profile = cfg_type.get("chunking_profile")

    # 3. Default Config (Fallback auf sliding_standard statt medium)
    if chunk_profile is None:
        chunk_profile = cfg_def.get("chunking_profile", "sliding_standard")

    # 4. Safety Fallback
    if not isinstance(chunk_profile, str) or not chunk_profile:
        chunk_profile = "sliding_standard"

    # --- edge_defaults ---
    edge_defaults = fm.get("edge_defaults")
    if edge_defaults is None:
        edge_defaults = cfg_type.get(
            "edge_defaults",
            cfg_def.get("edge_defaults", []),
        )
    edge_defaults = _ensure_list(edge_defaults)

    # --- Basis-Metadaten ---
    note_id = n.get("note_id") or n.get("id") or fm.get("id")
    title = n.get("title") or fm.get("title") or ""
    path = n.get("path") or path_arg
    if isinstance(path, pathlib.Path):
        path = str(path)

    payload: Dict[str, Any] = {
        "note_id": note_id,
        "title": title,
        "type": note_type,
        "path": path or "",
        "retriever_weight": retriever_weight,
        "chunk_profile": chunk_profile,
        "edge_defaults": edge_defaults,
        "hashes": {} # Init Hash Dict
    }
    
    # --- MULTI-HASH CALCULATION (Strategy Decoupling) ---
    # Wir berechnen immer BEIDE Strategien und speichern sie.
    # ingestion.py entscheidet dann anhand der ENV-Variable, welcher verglichen wird.
    modes_to_calc = ["body", "full"]
    
    for mode in modes_to_calc:
        content_to_hash = _get_hash_source_content(n, mode)
        computed_hash = _compute_hash(content_to_hash)
        # Key Schema: mode:source:normalize (z.B. "full:parsed:canonical")
        key = f"{mode}:{hash_source}:{hash_normalize}"
        payload["hashes"][key] = computed_hash

    # Tags / Keywords
    tags = fm.get("tags") or fm.get("keywords") or n.get("tags")
    if tags:
        payload["tags"] = _ensure_list(tags)

    # Aliases
    aliases = fm.get("aliases")
    if aliases:
        payload["aliases"] = _ensure_list(aliases)

    # Zeit
    for k in ("created", "modified", "date"):
        v = fm.get(k) or n.get(k)
        if v:
            payload[k] = str(v)
            
    # Fulltext
    if "body" in n and n["body"]:
        payload["fulltext"] = str(n["body"])

    # JSON Validation
    json.loads(json.dumps(payload, ensure_ascii=False))

    return payload