"""Lazy ICAR knowledge-base lookup.

The actual data lives in `icar_kb_data.py` (symlinked from the older project's
`icar_knowledge_base.py`, ~5000 lines, 200+ validated entries).

We expose a thin search wrapper that filters by crop+condition keywords and
returns a list of dicts ready to be folded into the LLM context.
"""
from __future__ import annotations
import logging
from typing import List, Optional

logger = logging.getLogger(__name__)

_ENTRIES: list = []
_LOADED = False


def _load():
    global _ENTRIES, _LOADED
    if _LOADED:
        return
    _LOADED = True
    try:
        from . import icar_kb_data  # symlinked module
        # The old module exposes ENTRIES (list of dicts).
        for name in ("ENTRIES", "ICAR_ENTRIES", "KB_ENTRIES"):
            if hasattr(icar_kb_data, name):
                _ENTRIES.extend(getattr(icar_kb_data, name))
                break
        if not _ENTRIES:
            # Fall back to grabbing every dict-typed module attribute that has
            # 'crop' + 'condition' keys.
            for v in vars(icar_kb_data).values():
                if isinstance(v, list) and v and isinstance(v[0], dict) \
                   and "crop" in v[0] and "condition" in v[0]:
                    _ENTRIES.extend(v)
                    break
        logger.info(f"[icar_kb] loaded {len(_ENTRIES)} entries")
    except Exception as e:
        logger.warning(f"[icar_kb] not loaded: {e}")


def search(query: str, *,
           crop: Optional[str] = None,
           top_k: int = 3) -> List[dict]:
    _load()
    if not _ENTRIES:
        return []
    q = query.lower()
    cl = (crop or "").lower()

    scored: list = []
    for e in _ENTRIES:
        ec = str(e.get("crop", "")).lower()
        cond = str(e.get("condition", "")).lower()
        cond_h = str(e.get("condition_hindi", "")).lower()
        score = 0
        if cl and cl in ec:
            score += 3
        if cond and cond in q:
            score += 5
        # match individual condition tokens
        for tok in cond.split():
            if tok and tok in q and len(tok) > 3:
                score += 1
        if cond_h and cond_h in query:  # devanagari unchanged
            score += 5
        if score > 0:
            scored.append((score, e))

    scored.sort(key=lambda x: x[0], reverse=True)
    return [e for _, e in scored[:top_k]]


def format_for_prompt(entries: List[dict]) -> str:
    if not entries:
        return ""
    lines = ["[ICAR VERIFIED CARDS — TRUST THESE OVER KCC RETRIEVAL]"]
    for i, e in enumerate(entries, 1):
        crop = e.get("crop", "")
        cond = e.get("condition", "")
        chem1 = e.get("chemical_1", "")
        dose1 = e.get("dose_1", "")
        timing = e.get("timing", "")
        ipm = e.get("ipm", "")
        lines.append(f"\n[ICAR-{i}] {crop} — {cond}")
        if chem1 and dose1:
            lines.append(f"  Chemical: {chem1} @ {dose1}")
        if e.get("chemical_2") and e.get("dose_2"):
            lines.append(f"  Alt: {e['chemical_2']} @ {e['dose_2']}")
        if timing:
            lines.append(f"  Timing: {timing}")
        if ipm:
            lines.append(f"  IPM: {ipm}")
    return "\n".join(lines)