"""MCP tool definitions for LeoCRM — generic CRM API access.

Single tool that gives MCP clients (Claude Desktop, etc.) full access to all
CRM API endpoints via the generic call_crm_api tool.
"""

from __future__ import annotations

import json
import logging
import os
import uuid
from typing import Any

from sqlalchemy.ext.asyncio import AsyncSession

from app.plugins.builtins.mcp_server.schemas import McpToolDefinition, McpToolParameter

logger = logging.getLogger(__name__)


def _get_base_url() -> str:
    """Get the internal base URL for API calls."""
    port = os.environ.get("PORT", "8000")
    return f"http://127.0.0.1:{port}"


# ─── Generic CRM API Tool ──────────────────────────────────────────────────

TOOL_DEFINITIONS: list[McpToolDefinition] = [
    McpToolDefinition(
        name="call_crm_api",
        description=(
            "Rufe einen beliebigen CRM API Endpunkt auf. "
            "GET zum Lesen, POST zum Erstellen, PATCH zum Aktualisieren, DELETE zum Löschen. "
            "Verfügbare Endpunkte: /api/v1/contacts, /api/v1/mail, /api/v1/calendar, "
            "/api/v1/dms, /api/v1/tasks, /api/v1/addresses, /api/v1/bank-accounts, "
            "/api/v1/search, /api/v1/comm, /api/v1/ai, /api/v1/reports, etc. "
            "Für POST/PATCH kann ein body (JSON) mitgegeben werden."
        ),
        category="system",
        required_permission="mcp:read",
        parameters=[
            McpToolParameter(name="method", type="string", description="HTTP Methode: GET, POST, PATCH, DELETE", required=True),
            McpToolParameter(name="path", type="string", description="API Pfad, z.B. /api/v1/contacts", required=True),
            McpToolParameter(name="body", type="object", description="Request body für POST/PATCH (JSON Objekt)", required=False),
        ],
    ),
    McpToolDefinition(
        name="search",
        description=(
            "Durchsuche alle CRM-Daten (Kontakte, Firmen, Mails, Dateien, Kalender, Tasks) "
            "mit Hybrid-Suche (Volltext + semantisch). "
            "Liefert kompakte Ergebnisse mit entity_type, title, snippet und score. "
            "Die Suche respektiert die Berechtigungen des aufrufenden Benutzers."
        ),
        category="search",
        required_permission="search:read",
        parameters=[
            McpToolParameter(name="query", type="string", description="Suchanfrage, z.B. 'Max Mustermann' oder 'Angebot 2026'", required=True),
            McpToolParameter(name="entity_types", type="array", description="Optional: Nur diese Entity-Typen durchsuchen (contact, company, mail, file, event, task, ...)", required=False),
            McpToolParameter(name="limit", type="integer", description="Maximale Anzahl Ergebnisse (Standard: 10)", required=False, default=10),
        ],
    ),
]


def get_tool_definition(name: str) -> McpToolDefinition | None:
    """Get a tool definition by name."""
    for tool in TOOL_DEFINITIONS:
        if tool.name == name:
            return tool
    return None


def get_all_tool_names() -> list[str]:
    """Get all tool names."""
    return [t.name for t in TOOL_DEFINITIONS]


# ─── Tool Handler ─────────────────────────────────────────────────────────


async def _handler_call_crm_api(db: AsyncSession, arguments: dict[str, Any], context: dict[str, Any]) -> dict[str, Any]:
    """Execute an arbitrary CRM API call on behalf of the MCP client."""
    method = arguments.get("method", "GET").upper()
    path = arguments.get("path", "")
    body = arguments.get("body")

    if not path:
        return {"error": "path is required"}

    if not path.startswith("/"):
        path = "/" + path

    try:
        tenant_id = context.get("tenant_id", "")
        user_id = context.get("user_id", "")

        # F09 (Astra P1): authenticated request via short-lived delegation
        # token - the MCP session user's real permissions apply.
        from app.plugins.builtins.ai_assistant.crm_api_tool import _make_internal_api_request

        resp = await _make_internal_api_request(
            method, path, tenant_id=str(tenant_id), user_id=str(user_id), body=body
        )

        try:
            resp_data = resp.json()
            # Truncate large responses
            resp_text = json.dumps(resp_data, default=str)
            if len(resp_text) > 8000:
                resp_data = json.loads(resp_text[:8000] + "...\n[truncated]")
            return resp_data
        except Exception:
            return {"response": resp.text[:8000]}

    except Exception as e:
        logger.exception("MCP call_crm_api failed")
        return {"error": str(e)}


# ─── Search Tool Handler ──────────────────────────────────────────────────


async def _handler_search(db: AsyncSession, arguments: dict[str, Any], context: dict[str, Any]) -> dict[str, Any]:
    """Execute a unified search on behalf of the MCP client.

    Uses the MCP session's user context (tenant_id, user_id) so that
    visibility filtering and RBAC are respected. MCP gets no special rights.
    """
    query = (arguments.get("query") or "").strip()
    if not query:
        return {"error": "query is required"}

    entity_types = arguments.get("entity_types")
    if isinstance(entity_types, str):
        entity_types = [t.strip() for t in entity_types.split(",") if t.strip()]
    limit = int(arguments.get("limit", 10) or 10)
    limit = max(1, min(limit, 50))

    tenant_id = context.get("tenant_id")
    user_id = context.get("user_id")
    is_system_admin = bool(context.get("is_system_admin", False))

    if not tenant_id:
        return {"error": "missing tenant context"}

    try:
        tenant_uuid = uuid.UUID(str(tenant_id))
        user_uuid = uuid.UUID(str(user_id)) if user_id else None
    except (ValueError, TypeError):
        return {"error": "invalid tenant/user context"}

    try:
        from app.plugins.builtins.contracts import get_contract
        search_contract = get_contract("unified_search")
        if search_contract is not None:
            query_analysis = await search_contract.llm_analyze_query(query, db=db, tenant_id=tenant_uuid)
            results = await search_contract.hybrid_search(
                db=db,
                query_analysis=query_analysis,
                tenant_id=tenant_uuid,
                entity_types=entity_types,
                limit=limit,
                user_id=user_uuid,
                is_system_admin=is_system_admin,
            )
        else:
            return {"error": "search plugin not available"}
    except Exception as e:
        logger.exception("MCP search failed")
        return {"error": str(e)}

    compact = [
        {
            "entity_type": r.get("entity_type", ""),
            "entity_id": r.get("entity_id", ""),
            "title": r.get("title", ""),
            "snippet": (r.get("snippet", "") or "")[:200],
            "score": round(float(r.get("score", 0.0)), 4),
        }
        for r in results
    ]

    return {"count": len(compact), "results": compact}


# ─── Handler Registry ─────────────────────────────────────────────────────

TOOL_HANDLERS: dict[str, Any] = {
    "call_crm_api": _handler_call_crm_api,
    "search": _handler_search,
}