"""
semantic_store.py

Wrapper around all_session_summary.json and all_session_user_facts.json.
Provides:
  - keyword_search(): find sessions whose semantic text contains given keywords
  - to_prompt(): format semantic context for LLM consumption
  - get_text(): return raw semantic text for a session (for embedding/search)
"""

import json
from typing import Dict, List, Optional


class SemanticMemoryStore:
    def __init__(self, summary_path: str, facts_path: str):
        print(f"[SemanticMemoryStore] Loading {summary_path} ...")
        with open(summary_path) as f:
            self._summaries: Dict[str, dict] = json.load(f)

        print(f"[SemanticMemoryStore] Loading {facts_path} ...")
        with open(facts_path) as f:
            self._facts: Dict[str, list] = json.load(f)

        print(f"[SemanticMemoryStore] Loaded {len(self._summaries)} summaries, "
              f"{len(self._facts)} fact entries.")

    def get_summary(self, sess_id: str) -> str:
        """Return the session-level summary string, or empty string."""
        entry = self._summaries.get(sess_id, {})
        return entry.get("session_summary", "").strip()

    def get_facts_text(self, sess_id: str) -> str:
        """Return user facts as a single joined string, or empty string."""
        fact_list = self._facts.get(sess_id, [])
        if not fact_list:
            return ""
        return " ".join(
            f["user-info"] for f in fact_list
            if isinstance(f, dict) and f.get("user-info")
        ).strip()

    def get_text(self, sess_id: str) -> str:
        """Return summary + facts combined (for keyword search or display)."""
        parts = [self.get_summary(sess_id), self.get_facts_text(sess_id)]
        return " ".join(p for p in parts if p)

    def keyword_search(self, keywords: List[str], haystack_sess_ids: List[str]) -> List[str]:
        """
        Search semantic text (summary + facts) of the given sessions for any keyword.

        Returns:
            List of matching session IDs (preserving haystack order).
        """
        matched = []
        kws_lower = [kw.lower() for kw in keywords if kw]
        for sid in haystack_sess_ids:
            text = self.get_text(sid).lower()
            if any(kw in text for kw in kws_lower):
                matched.append(sid)
        return matched

    def to_prompt(self, sess_ids: List[str], date_lookup: Optional[Dict[str, str]] = None) -> str:
        """
        Format semantic context for these sessions as a prompt string.

        Each session block:
            Session Date: <date>
            Summary: <session_summary>
            User Facts: <fact1>; <fact2>; ...
        """
        lines = []
        for sid in sess_ids:
            date_str = date_lookup.get(sid, "") if date_lookup else ""
            summary = self.get_summary(sid)
            facts_text = self.get_facts_text(sid)

            block = f"Session ID: {sid}"
            if date_str:
                block += f"\nSession Date: {date_str}"
            if summary:
                block += f"\nSummary: {summary}"
            if facts_text:
                block += f"\nUser Facts: {facts_text}"
            lines.append(block)

        return "\n\n".join(lines)