"""Personal Assistant Node: routes to domain experts, holds user context."""

import json
import logging

from .base import Node
from ..llm import llm_call
from ..types import Command, PARouting

log = logging.getLogger("runtime")


class PANode(Node):
    name = "pa_v1"
    model = "anthropic/claude-haiku-4.5"
    max_context_tokens = 4000

    SYSTEM = """You are the Personal Assistant (PA) — the user's companion in this cognitive runtime.
You manage the conversation and route domain-specific work to the right expert.

Listener: {identity} on {channel}

Available experts:
{experts}

YOUR JOB:
1. Understand what the user wants
2. If it's a domain task: route to the right expert with a clear, self-contained job description
3. If it's social/general: respond directly (no expert needed)

Output ONLY valid JSON:
{{
  "expert": "eras | plankiste | none",
  "job": "Self-contained task description for the expert. Include all context the expert needs — it has NO conversation history.",
  "thinking_message": "Short message shown to user while expert works (in user's language). e.g. 'Moment, ich schaue in der Datenbank nach...'",
  "response_hint": "If expert=none, your direct response to the user.",
  "language": "de | en | mixed"
}}

Rules:
- The expert has NO history. The job must be fully self-contained.
- Include relevant facts from memory in the job (e.g. "customer Kathrin Jager, ID 2").
- thinking_message should be natural and in the user's language.
- For greetings, thanks, general chat: expert=none, write response_hint directly.
- For DB queries, reports, data analysis: route to the domain expert.
- When unsure which expert: expert=none, ask the user to clarify.

{memory_context}"""

    EXPERT_DESCRIPTIONS = {
        "eras": "eras — heating/energy customer database (eras2_production). Customers, devices, billing, consumption data.",
        "plankiste": "plankiste — Kita planning database (plankiste_test). Children, care schedules, offers, pricing.",
    }

    def __init__(self, send_hud):
        super().__init__(send_hud)
        self.directive: dict = {"mode": "assistant", "style": "helpful and concise"}
        self._available_experts: list[str] = []

    def set_available_experts(self, experts: list[str]):
        """Called by frame engine to tell PA which experts are in this graph."""
        self._available_experts = experts

    def get_context_line(self) -> str:
        d = self.directive
        return f"PA: {d['mode']} mode. {d['style']}."

    async def route(self, command: Command, history: list[dict],
                    memory_context: str = "", identity: str = "unknown",
                    channel: str = "unknown") -> PARouting:
        """Decide which expert handles this request."""
        await self.hud("thinking", detail="routing request")

        # Build expert list for prompt
        expert_lines = []
        for name in self._available_experts:
            desc = self.EXPERT_DESCRIPTIONS.get(name, f"{name} — domain expert")
            expert_lines.append(f"- {desc}")
        if not expert_lines:
            expert_lines.append("- (no experts available — handle everything directly)")

        messages = [
            {"role": "system", "content": self.SYSTEM.format(
                memory_context=memory_context, identity=identity, channel=channel,
                experts="\n".join(expert_lines))},
        ]

        # Summarize recent history (PA sees full context)
        recent = history[-12:]
        if recent:
            lines = []
            for msg in recent:
                role = msg.get("role", "?")
                content = msg.get("content", "")[:100]
                lines.append(f"  {role}: {content}")
            messages.append({"role": "user", "content": "Recent conversation:\n" + "\n".join(lines)})
            messages.append({"role": "assistant", "content": "OK, I have the context."})

        a = command.analysis
        messages.append({"role": "user",
                         "content": f"Route this message (intent={a.intent}, lang={a.language}, tone={a.tone}):\n{command.source_text}"})
        messages = self.trim_context(messages)

        await self.hud("context", messages=messages, tokens=self.last_context_tokens,
                       max_tokens=self.max_context_tokens, fill_pct=self.context_fill_pct)

        raw = await llm_call(self.model, messages)
        log.info(f"[pa] raw: {raw[:300]}")

        routing = self._parse_routing(raw, command)
        await self.hud("routed", expert=routing.expert, job=routing.job[:100],
                       direct=routing.expert == "none")

        # Update directive style based on tone
        if command.analysis.tone == "frustrated":
            self.directive["style"] = "patient and empathetic"
        elif command.analysis.tone == "playful":
            self.directive["style"] = "light and fun"
        else:
            self.directive["style"] = "helpful and concise"

        return routing

    def _parse_routing(self, raw: str, command: Command) -> PARouting:
        """Parse LLM JSON into PARouting with fallback."""
        text = raw.strip()
        if text.startswith("```"):
            text = text.split("\n", 1)[1] if "\n" in text else text[3:]
            if text.endswith("```"):
                text = text[:-3]
            text = text.strip()

        try:
            data = json.loads(text)
            expert = data.get("expert", "none")
            # Validate expert is available
            if expert != "none" and expert not in self._available_experts:
                log.warning(f"[pa] expert '{expert}' not available, falling back to none")
                expert = "none"
            return PARouting(
                expert=expert,
                job=data.get("job", ""),
                thinking_message=data.get("thinking_message", ""),
                response_hint=data.get("response_hint", ""),
                language=data.get("language", command.analysis.language),
            )
        except (json.JSONDecodeError, Exception) as e:
            log.error(f"[pa] parse failed: {e}, raw: {text[:200]}")
            return PARouting(
                expert="none",
                response_hint=command.source_text,
                language=command.analysis.language,
            )