FabledScribe/src/fabledassistant/services/intent.py

"""Quick-capture intent classifier.

Classifies short capture text (note, task, event, research) for the
/api/quick-capture endpoint using a dedicated prompt and the primary model.
"""

import json
import logging
import re
from dataclasses import dataclass, field
from datetime import date as date_type

from fabledassistant.services.llm import generate_completion

logger = logging.getLogger(__name__)


@dataclass
class IntentResult:
    tool_name: str | None = None  # None = no tool, just chat
    arguments: dict = field(default_factory=dict)
    confidence: str = "high"  # "high", "medium", or "low"
    ack: str | None = None  # One-sentence acknowledgment to stream immediately

    @property
    def should_execute(self) -> bool:
        """True if a tool was identified with sufficient confidence."""
        return self.tool_name is not None and self.confidence != "low"


def _build_tool_summary(tools: list[dict]) -> str:
    """Build a compact tool description string from Ollama tool defs."""
    lines: list[str] = []
    for tool in tools:
        fn = tool.get("function", {})
        name = fn.get("name", "")
        desc = fn.get("description", "")
        params = fn.get("parameters", {}).get("properties", {})
        required = set(fn.get("parameters", {}).get("required", []))

        param_parts: list[str] = []
        for pname, pinfo in params.items():
            req = " (required)" if pname in required else ""
            pdesc = pinfo.get("description", "")
            param_parts.append(f"  - {pname}: {pdesc}{req}")

        lines.append(f"- {name}: {desc}")
        lines.extend(param_parts)
    return "\n".join(lines)



def _parse_intent(raw: str, tools: list[dict]) -> IntentResult:
    """Parse the LLM's JSON response into an IntentResult."""
    text = raw.strip()

    # Strip markdown code fences if present
    text = re.sub(r"^```(?:json)?\s*", "", text)
    text = re.sub(r"\s*```$", "", text)
    text = text.strip()

    # Try direct JSON parse
    parsed = _try_json(text)

    # Fallback: extract first JSON object from response
    if parsed is None:
        match = re.search(r"\{.*\}", text, re.DOTALL)
        if match:
            parsed = _try_json(match.group())

    if parsed is None or not isinstance(parsed, dict):
        logger.warning("Could not parse intent from LLM response: %s", text[:200])
        return IntentResult()

    tool_name = parsed.get("tool")
    confidence = parsed.get("confidence", "high")
    if confidence not in ("high", "medium", "low"):
        confidence = "high"

    if tool_name is None:
        return IntentResult(confidence=confidence)

    # Validate tool name against available tools
    valid_names = {
        t.get("function", {}).get("name") for t in tools
    }
    if tool_name not in valid_names:
        logger.warning("Intent returned unknown tool '%s'", tool_name)
        return IntentResult()

    arguments = parsed.get("arguments", {})
    if not isinstance(arguments, dict):
        arguments = {}

    ack = parsed.get("ack") or None
    if ack is not None:
        ack = ack.strip() or None

    logger.info(
        "Intent classified: tool=%s, confidence=%s, args=%s",
        tool_name, confidence, json.dumps(arguments)[:200],
    )
    return IntentResult(tool_name=tool_name, arguments=arguments, confidence=confidence, ack=ack)


def _try_json(text: str) -> dict | list | None:
    """Try to parse JSON, return None on failure."""
    try:
        return json.loads(text)
    except (json.JSONDecodeError, TypeError):
        return None


# ── Quick-capture classifier ──────────────────────────────────────────────────
# A stripped-down prompt designed for the /api/quick-capture endpoint.
# Unlike the general intent prompt, this ALWAYS routes to a create tool —
# null is not a valid response.

_CAPTURE_SYSTEM_PROMPT = """\
You are a quick-capture classifier. The user has sent a short snippet of text \
from a mobile app or external client. Classify it as a note, task, or calendar \
event, then extract the relevant fields.

Today's date is {today}.

Available tools:
{tool_summary}

Rules:
- You MUST choose one of the available tools. Never return null.
- create_task: action items, todos, reminders, things to do ("buy milk", "call John", "fix the bug", "remind me to…")
- create_event: appointments, meetings, scheduled occurrences with a date/time ("dentist Friday 2pm", "team meeting next Tuesday")
- update_note: updating, editing, appending to an existing note or task ("add to my shopping list: eggs", "mark buy milk done", "append to my meeting notes", "update my project note")
- research_topic: user wants a comprehensive research note from web sources ("research X", "look up X and make a note", "find everything about X", "compile a note on X")
- create_note: everything else — ideas, observations, links, excerpts, longer text
- For create_task / create_event: extract a concise title; put any extra detail in "body"
- For create_note: use a short descriptive title (≤60 chars); put the FULL original text as "body"
- For update_note: set "query" to the note or task title to find; set other fields as needed
- For research_topic: set "topic" to the subject being researched
- For dates use YYYY-MM-DD; for datetime use ISO 8601
- confidence: "high" if the type is clear; "medium" if you're guessing

Respond with ONLY a JSON object:
{{"tool": "tool_name", "arguments": {{...}}, "confidence": "high"|"medium"}}

Do NOT wrap in markdown code fences."""


async def classify_capture_intent(
    text: str,
    tools: list[dict],
    model: str,
) -> IntentResult:
    """Classify quick-capture text and extract arguments.

    Uses a simplified prompt that always routes to a create tool — never null.
    Returns IntentResult with tool_name set.  Falls back to IntentResult() only
    on LLM/parse failure (caller should handle that case).
    """
    if not tools:
        return IntentResult()

    tool_summary = _build_tool_summary(tools)
    today = date_type.today().isoformat()

    messages = [
        {
            "role": "system",
            "content": _CAPTURE_SYSTEM_PROMPT.format(
                today=today, tool_summary=tool_summary
            ),
        },
        {"role": "user", "content": text},
    ]

    try:
        raw = await generate_completion(messages, model, max_tokens=300, num_ctx=2048)
    except Exception:
        logger.warning("Quick-capture intent LLM call failed", exc_info=True)
        return IntentResult()

    return _parse_intent(raw, tools)