"""Resolution output generator — three deliverables on session resolve."""
import logging
from typing import Any
from uuid import UUID

from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.ai_session import AISession
from app.models.session_resolution_output import SessionResolutionOutput
from app.services.assistant_chat_service import _call_ai

logger = logging.getLogger(__name__)

RESOLUTION_MODEL = "claude-sonnet-4-6"


class ResolutionOutputGenerator:
    def __init__(self, db: AsyncSession):
        self.db = db

    async def generate_all(
        self,
        session_id: UUID,
        root_cause: str | None = None,
        steps_taken: list[str] | None = None,
        recommendations: str | None = None,
    ) -> list[SessionResolutionOutput]:
        result = await self.db.execute(
            select(AISession).where(AISession.id == session_id)
        )
        session = result.scalar_one_or_none()
        if not session:
            raise ValueError(f"Session {session_id} not found")

        context = self._build_session_context(
            session,
            root_cause=root_cause,
            steps_taken=steps_taken,
            recommendations=recommendations,
        )

        outputs = []
        for output_type, prompt in [
            ("psa_ticket_notes", self._psa_notes_prompt(context)),
            ("knowledge_base", self._kb_article_prompt(context)),
            ("client_summary", self._client_summary_prompt(context)),
        ]:
            content, _, _ = await _call_ai(
                system_base="You are a technical documentation assistant for MSP teams.",
                rag_context="",
                history=[],
                new_message=prompt,
                max_tokens=2048,
            )

            output = SessionResolutionOutput(
                session_id=session_id,
                output_type=output_type,
                generated_content=content,
                status="draft",
                generated_by_model=RESOLUTION_MODEL,
            )
            self.db.add(output)
            outputs.append(output)

        await self.db.flush()
        return outputs

    async def edit_output(self, output_id: UUID, edited_content: str) -> SessionResolutionOutput:
        result = await self.db.execute(
            select(SessionResolutionOutput).where(SessionResolutionOutput.id == output_id)
        )
        output = result.scalar_one_or_none()
        if not output:
            raise ValueError(f"Output {output_id} not found")
        output.edited_content = edited_content
        await self.db.flush()
        return output

    async def push_output(self, output_id: UUID, destination: str) -> SessionResolutionOutput:
        result = await self.db.execute(
            select(SessionResolutionOutput).where(SessionResolutionOutput.id == output_id)
        )
        output = result.scalar_one_or_none()
        if not output:
            raise ValueError(f"Output {output_id} not found")

        from datetime import datetime, timezone
        output.status = "pushed"
        output.pushed_to = destination
        output.pushed_at = datetime.now(timezone.utc)
        await self.db.flush()
        return output

    def _build_session_context(
        self,
        session: AISession,
        root_cause: str | None = None,
        steps_taken: list[str] | None = None,
        recommendations: str | None = None,
    ) -> str:
        parts = [
            f"Problem: {session.problem_summary or 'Unknown'}",
            f"Domain: {session.problem_domain or 'Unknown'}",
            f"Resolution: {session.resolution_summary or 'Not specified'}",
            f"Steps taken: {session.step_count}",
        ]

        # Structured handoff fields from cockpit conclude modal
        if root_cause:
            parts.append(f"Root cause: {root_cause}")
        if steps_taken:
            parts.append("Steps performed:")
            for step in steps_taken:
                parts.append(f"  - {step}")
        if recommendations:
            parts.append(f"Recommendations: {recommendations}")

        # Triage metadata
        if getattr(session, 'client_name', None):
            parts.append(f"Client: {session.client_name}")
        if getattr(session, 'triage_hypothesis', None):
            parts.append(f"Hypothesis: {session.triage_hypothesis}")
        if getattr(session, 'evidence_items', None):
            parts.append("Evidence collected:")
            for item in session.evidence_items:
                icon = {"confirmed": "✓", "ruled_out": "✗", "pending": "?"}.get(item.get("status", ""), "?")
                parts.append(f"  {icon} {item.get('text', '')}")

        msgs = session.conversation_messages or []
        if msgs:
            parts.append("\nConversation highlights:")
            for msg in msgs[-10:]:
                role = msg.get("role", "unknown")
                content = msg.get("content", "")[:200]
                parts.append(f"  [{role}]: {content}")
        return "\n".join(parts)

    def _psa_notes_prompt(self, context: str) -> str:
        return (
            f"Generate professional PSA ticket notes for this resolved troubleshooting session.\n"
            f"Format as structured markdown with: Problem, Diagnostic Steps, Resolution, Recommendations.\n\n{context}"
        )

    def _kb_article_prompt(self, context: str) -> str:
        return (
            f"Generate a knowledge base article draft from this resolved session.\n"
            f"Include: Symptoms, Root Cause, Resolution Steps, Things to Rule Out First.\n\n{context}"
        )

    def _client_summary_prompt(self, context: str) -> str:
        return (
            f"Generate a non-technical summary for the end user/client.\n"
            f"Explain what was wrong and what was done to fix it in plain language.\n"
            f"No jargon. 2-3 paragraphs max.\n\n{context}"
        )