"""Integration tools — Agent → Workflow and Agent → Knowledge (I-AW, I-AK).

Provides AI agent tools for:
- Starting and checking workflow status (I-AW)
- Querying knowledge base with evidence (I-AK)

These tools are registered in the AI tool registry and can be used by
agents via the ReAct loop. Each tool respects tenant_id and permissions.
"""

from __future__ import annotations

import logging
import uuid
from typing import Any

from sqlalchemy.ext.asyncio import AsyncSession

logger = logging.getLogger(__name__)


# ─── I-AW: Agent → Workflow Tools ────────────────────────────────────────────


async def start_workflow_tool(
    db: AsyncSession,
    tenant_id: uuid.UUID,
    user_id: uuid.UUID,
    workflow_id: str,
    context: dict[str, Any] | None = None,
) -> dict[str, Any]:
    """Agent tool: Start a workflow instance.

    Args:
        workflow_id: The workflow definition ID.
        context: Optional initial context variables.

    Returns:
        Dict with instance_id, status, and workflow info.
    """
    from app.services.workflow_service import create_instance

    try:
        result = await create_instance(
            db,
            tenant_id,
            user_id,
            workflow_id=workflow_id,
            context=context or {},
        )
        if result is None:
            return {"error": "Workflow not found", "status": "not_found"}
        return {
            "instance_id": result.get("id"),
            "status": result.get("status"),
            "workflow_id": workflow_id,
            "message": f"Workflow started successfully",
        }
    except Exception as e:
        logger.warning("start_workflow_tool failed: %s", e)
        return {"error": str(e), "status": "failed"}


async def check_workflow_status_tool(
    db: AsyncSession,
    tenant_id: uuid.UUID,
    instance_id: str,
) -> dict[str, Any]:
    """Agent tool: Check the status of a workflow instance.

    Args:
        instance_id: The workflow instance ID.

    Returns:
        Dict with status, current_step, and step history.
    """
    from app.services.workflow_service import get_instance
    from app.models.workflow import WorkflowStepHistory
    from sqlalchemy import select

    try:
        instance = await get_instance(db, tenant_id, instance_id)
        if instance is None:
            return {"error": "Instance not found", "status": "not_found"}

        # Get step history
        history_result = await db.execute(
            select(WorkflowStepHistory)
            .where(
                WorkflowStepHistory.tenant_id == tenant_id,
                WorkflowStepHistory.instance_id == uuid.UUID(instance_id),
            )
            .order_by(WorkflowStepHistory.created_at.desc())
            .limit(5)
        )
        recent_steps = [
            {
                "step_index": h.step_index,
                "step_type": h.step_type,
                "action": h.action,
            }
            for h in history_result.scalars().all()
        ]

        return {
            "instance_id": instance_id,
            "status": instance.get("status"),
            "current_step_index": instance.get("current_step_index"),
            "recent_steps": recent_steps,
        }
    except Exception as e:
        logger.warning("check_workflow_status_tool failed: %s", e)
        return {"error": str(e), "status": "failed"}


# ─── I-AK: Agent → Knowledge Tools ───────────────────────────────────────────


async def ask_knowledge_tool(
    db: AsyncSession,
    tenant_id: uuid.UUID,
    user_id: uuid.UUID,
    query: str,
    source_types: list[str] | None = None,
    max_results: int = 5,
) -> dict[str, Any]:
    """Agent tool: Query the knowledge base with evidence-backed results.

    Args:
        query: Natural language query.
        source_types: Optional filter (wiki, dms, mail, communication).
        max_results: Maximum results to return.

    Returns:
        Dict with answer, evidence references, and workstream blocks.
    """
    from app.ai.knowledge_lifecycle import ask_knowledge

    return await ask_knowledge(
        db=db,
        tenant_id=tenant_id,
        user_id=user_id,
        query=query,
        source_types=source_types,
        max_results=max_results,
    )


async def search_knowledge_tool(
    db: AsyncSession,
    tenant_id: uuid.UUID,
    user_id: uuid.UUID,
    query: str,
    entity_type: str | None = None,
    limit: int = 10,
) -> dict[str, Any]:
    """Agent tool: Search across all knowledge sources.

    Args:
        query: Search query.
        entity_type: Optional entity type filter.
        limit: Maximum results.

    Returns:
        Dict with search results and evidence references.
    """
    try:
        from app.plugins.builtins.unified_search.contracts import UnifiedSearchContract
        contract = UnifiedSearchContract
        search_fn = contract.get_function("unified_search")
        if search_fn is None:
            return {"error": "Search not available", "results": []}

        results = await search_fn(
            db=db,
            tenant_id=tenant_id,
            query=query,
            entity_type=entity_type,
            limit=limit,
        )

        # Build evidence references
        from app.ai.knowledge_sources import build_evidence_references
        refs = build_evidence_references(results or [], max_results=limit)

        return {
            "results": [r.to_dict() for r in refs],
            "total": len(refs),
            "query": query,
        }
    except Exception as e:
        logger.warning("search_knowledge_tool failed: %s", e)
        return {"error": str(e), "results": []}


# ─── Tool Registration ───────────────────────────────────────────────────────


def register_integration_tools(registry: Any) -> None:
    """Register integration tools in the AI tool registry.

    Called during plugin initialization to make workflow and knowledge
    tools available to AI agents.
    """
    # These would be registered as ToolDefinition objects in the registry.
    # The actual registration depends on the ToolRegistry API.
    # For now, we expose the functions for manual registration.
    pass


__all__ = [
    "start_workflow_tool",
    "check_workflow_status_tool",
    "ask_knowledge_tool",
    "search_knowledge_tool",
    "register_integration_tools",
]