memory.py

import os
import logging
from typing import Any, Mapping, cast

from plugin.framework.tool import ToolBase
from plugin.framework.config import user_config_dir
from plugin.framework.errors import ConfigError

log = logging.getLogger(__name__)


def _resolve_uno_ctx(ctx):
    """Accept ToolContext or raw UNO context."""
    return getattr(ctx, "ctx", ctx)


class MemoryStore:
    def __init__(self, ctx):
        self.config_dir = user_config_dir(_resolve_uno_ctx(ctx))
        if self.config_dir is None:
            raise ConfigError("UNO context is required to resolve memory store path")
        self.memory_dir = os.path.join(self.config_dir, "memories")
        os.makedirs(self.memory_dir, exist_ok=True)

    def _get_path(self, target: str) -> str:
        filename = "USER.md" if target == "user" else "MEMORY.md"
        return os.path.join(self.memory_dir, filename)

    def read(self, target: str) -> str:
        path = self._get_path(target)
        if not os.path.exists(path):
            return ""
        with open(path, "r", encoding="utf-8") as f:
            return f.read()

    def write(self, target: str, content: str) -> bool:
        path = self._get_path(target)
        with open(path, "w", encoding="utf-8") as f:
            f.write(content)
        return True


# Chat preview when upsert_memory runs (sidebar / librarian); value truncated for huge strings.
UPSERT_MEMORY_CHAT_VALUE_MAX = 400


def upsert_memory_arguments_dict(arguments: object) -> dict[str, Any] | None:
    """Normalize smolagents ToolCall.arguments (dict or JSON string) to a dict."""
    if isinstance(arguments, dict):
        return cast("dict[str, Any]", arguments)
    if isinstance(arguments, str):
        from plugin.framework.errors import safe_json_loads

        parsed = safe_json_loads(arguments)
        return parsed if isinstance(parsed, dict) else None
    return None


def memory_key_from_tool_arguments(arguments: object) -> str | None:
    """Extract memory key from smolagents ToolCall.arguments (dict or JSON string)."""
    d = upsert_memory_arguments_dict(arguments)
    if not d:
        return None
    k = d.get("key")
    return k if isinstance(k, str) else None


def format_upsert_memory_chat_line(func_args: Mapping[str, Any]) -> str:
    """One-line chat preview when upsert_memory starts (main chat tool loop)."""
    key = func_args.get("key")
    if not isinstance(key, str):
        return "[Running tool: upsert_memory...]\n"
    raw = func_args.get("content", "")
    if raw is None:
        val = ""
    elif isinstance(raw, str):
        val = raw
    else:
        val = str(raw)
    one_line = val.replace("\n", " ").replace("\r", " ")
    if len(one_line) > UPSERT_MEMORY_CHAT_VALUE_MAX:
        one_line = one_line[: UPSERT_MEMORY_CHAT_VALUE_MAX - 3] + "..."
    return f"[Memory update: key {key!r} value {one_line!r}]\n"


def format_upsert_memory_chat_line_from_arguments(arguments: object) -> str:
    """Chat preview for librarian ToolCall.arguments (dict or JSON string)."""
    d = upsert_memory_arguments_dict(arguments)
    if not d:
        return "[Memory update: upsert_memory]\n"
    return format_upsert_memory_chat_line(d)


class MemoryTool(ToolBase):
    """Persistent file-backed memory for the agent (USER profile)."""

    name = "upsert_memory"
    description = "Persistent memory for the agent. Stores user profile, preferences, and quirks. Inserts or updates a specific key in a YAML/JSON-like key: value structure. To delete a memory, update it with an empty string."
    uno_services = None
    tier = "core"
    intent = "navigate"
    is_mutation = False

    parameters = {"type": "object", "properties": {"key": {"type": "string", "description": "The key to update or insert (e.g., 'favorite_color')."}, "content": {"type": "string", "description": "The new value to associate with the key."}}, "required": ["key", "content"]}

    def execute(self, ctx, **kwargs):
        import json

        key = kwargs.get("key")
        content = kwargs.get("content", "")

        if not key:
            return self._tool_error("Key is required.")

        try:
            store = MemoryStore(ctx)
        except Exception as e:
            return self._tool_error(f"Failed to initialize memory store: {e}")

        target = "user"
        try:
            current = store.read(target)
        except OSError as e:
            return self._tool_error(f"Failed to read existing memory: {e}")

        try:
            parsed = json.loads(current) if current.strip() else {}
            if not isinstance(parsed, dict):
                # Not a JSON object: start over so the librarian can rebuild memory.
                parsed = {}
        except json.JSONDecodeError:
            # Invalid JSON (e.g. legacy YAML): start over.
            parsed = {}

        # Nested update
        parts = key.split(".")
        current_dict = parsed
        for part in parts[:-1]:
            if part not in current_dict or not isinstance(current_dict[part], dict):
                current_dict[part] = {}
            current_dict = current_dict[part]

        current_dict[parts[-1]] = content

        new_content = json.dumps(parsed, indent=2, ensure_ascii=False)
        if new_content == current:
            return {"status": "ok", "message": f"Memory for '{key}' is already up to date."}

        try:
            store.write(target, new_content)
            return {"status": "ok", "message": f"Upserted key '{key}' in memory."}
        except OSError as e:
            return self._tool_error(f"Failed to write memory: {e}")