"""Adapters for Mem0 and Mem0-Graph baselines."""

from __future__ import annotations

import os
import uuid as _uuid
from pathlib import Path
from typing import Any

from dotenv import load_dotenv

load_dotenv(Path(__file__).resolve().parents[2] / ".env")

from eval_framework.datasets.schemas import (
    MemoryDeltaRecord,
    MemorySnapshotRecord,
    NormalizedTurn,
    RetrievalItem,
    RetrievalRecord,
)
from eval_framework.memory_adapters.base import MemoryAdapter


class Mem0Adapter(MemoryAdapter):
    """Adapter for Mem0 (vector mode)."""

    def __init__(self, *, use_graph: bool = False, **kwargs: Any) -> None:
        from mem0 import Memory

        self._user_id = f"eval_{_uuid.uuid4().hex[:8]}"
        self._session_id = ""
        self._prev_snapshot_ids: set[str] = set()

        config: dict[str, Any] = {
            "llm": {
                "provider": "openai",
                "config": {
                    "model": os.getenv("OPENAI_MODEL") or "gpt-4o",
                    "api_key": os.getenv("OPENAI_API_KEY") or "",
                },
            },
            "embedder": {
                "provider": "openai",
                "config": {
                    "model": "text-embedding-3-small",
                    "api_key": os.getenv("OPENAI_API_KEY") or "",
                    "embedding_dims": 1536,
                },
            },
        }

        base_url = os.getenv("OPENAI_BASE_URL")
        if base_url:
            config["llm"]["config"]["openai_base_url"] = base_url
            config["embedder"]["config"]["openai_base_url"] = base_url

        if use_graph:
            config["graph_store"] = {
                "provider": "kuzu",
                "config": {
                    "url": "/tmp/mem0_kuzu_eval",
                },
            }

        self._memory = Memory.from_config(config)
        self._use_graph = use_graph

    def reset(self) -> None:
        self._memory.delete_all(user_id=self._user_id)
        self._user_id = f"eval_{_uuid.uuid4().hex[:8]}"
        self._prev_snapshot_ids = set()

    def ingest_turn(self, turn: NormalizedTurn) -> None:
        self._session_id = turn.session_id
        text = f"{turn.role}: {turn.text}"
        for att in turn.attachments:
            text += f"\n[{att.type}] {att.caption}"
        # Truncate to avoid excessively long inputs that break graph entity extraction
        text = text[:2000]
        try:
            self._memory.add(
                messages=[{"role": turn.role, "content": text}],
                user_id=self._user_id,
            )
        except Exception:
            # Graph mode can fail on entity embedding; fall back silently
            pass

    def end_session(self, session_id: str) -> None:
        self._session_id = session_id

    def snapshot_memories(self) -> list[MemorySnapshotRecord]:
        all_mems = self._memory.get_all(user_id=self._user_id)
        rows: list[MemorySnapshotRecord] = []

        # Vector results (standard mode)
        results = all_mems.get("results", []) if isinstance(all_mems, dict) else all_mems
        for mem in results:
            mid = str(mem.get("id", ""))
            text = str(mem.get("memory", ""))
            rows.append(MemorySnapshotRecord(
                memory_id=mid, text=text,
                session_id=self._session_id, status="active",
                source="Mem0", raw_backend_id=mid,
                raw_backend_type="mem0_vector", metadata={},
            ))

        # Graph relations (graph mode)
        relations = all_mems.get("relations", []) if isinstance(all_mems, dict) else []
        for i, rel in enumerate(relations):
            if isinstance(rel, dict):
                src = rel.get("source", "")
                rtype = rel.get("relationship", "")
                tgt = rel.get("target") or rel.get("destination", "")
                text = f"{src} → {rtype} → {tgt}"
                mid = f"rel_{i}"
                rows.append(MemorySnapshotRecord(
                    memory_id=mid, text=text,
                    session_id=self._session_id, status="active",
                    source="Mem0-Graph", raw_backend_id=mid,
                    raw_backend_type="mem0_graph_relation", metadata=rel,
                ))

        return rows

    def export_memory_delta(self, session_id: str) -> list[MemoryDeltaRecord]:
        current = self.snapshot_memories()
        current_ids = {s.memory_id for s in current}
        deltas = [
            MemoryDeltaRecord(
                session_id=session_id,
                op="add",
                text=s.text,
                linked_previous=(),
                raw_backend_id=s.raw_backend_id,
                metadata={"baseline": "Mem0"},
            )
            for s in current if s.memory_id not in self._prev_snapshot_ids
        ]
        self._prev_snapshot_ids = current_ids
        return deltas

    def retrieve(self, query: str, top_k: int) -> RetrievalRecord:
        results = self._memory.search(query=query, user_id=self._user_id, limit=top_k)
        items: list[RetrievalItem] = []

        # Vector results
        search_results = results.get("results", []) if isinstance(results, dict) else results
        for i, r in enumerate(search_results[:top_k]):
            items.append(RetrievalItem(
                rank=len(items),
                memory_id=str(r.get("id", i)),
                text=str(r.get("memory", "")),
                score=float(r.get("score", 1.0 / (i + 1))),
                raw_backend_id=str(r.get("id", "")),
            ))

        # Graph relations
        relations = results.get("relations", []) if isinstance(results, dict) else []
        for rel in relations:
            if isinstance(rel, dict) and len(items) < top_k:
                src = rel.get("source", "")
                rtype = rel.get("relationship", "")
                tgt = rel.get("target") or rel.get("destination", "")
                items.append(RetrievalItem(
                    rank=len(items),
                    memory_id=f"rel_{len(items)}",
                    text=f"{src} → {rtype} → {tgt}",
                    score=0.9,
                    raw_backend_id=None,
                ))

        return RetrievalRecord(
            query=query, top_k=top_k, items=items[:top_k],
            raw_trace={"baseline": "Mem0-Graph" if self._use_graph else "Mem0"},
        )

    def get_capabilities(self) -> dict[str, Any]:
        return {
            "backend": "Mem0-Graph" if self._use_graph else "Mem0",
            "baseline": "Mem0-Graph" if self._use_graph else "Mem0",
            "available": True,
            "delta_granularity": "snapshot_diff",
            "snapshot_mode": "full",
        }