#!/usr/bin/env python3
"""Schaeffler Automat MCP Server.

Exposes the render pipeline, product library, material system, and order
management as MCP tools for Claude Code.

Requirements (install once):
    uv pip install "mcp[cli]" psycopg2-binary httpx

Register in Claude Code:
    claude mcp add schaeffler -- python schaeffler_mcp_server.py
"""
import json
import os
from datetime import datetime

import httpx
import psycopg2
import psycopg2.extras
from mcp.server.fastmcp import FastMCP

# ── Configuration ────────────────────────────────────────────────────────────

DB_URL = os.environ.get(
    "DATABASE_URL",
    "postgresql://schaeffler:schaeffler@localhost:5432/schaeffler",
)
API_URL = os.environ.get("API_URL", "http://localhost:8888")
API_EMAIL = os.environ.get("API_EMAIL", "admin@schaeffler.com")
API_PASSWORD = os.environ.get("API_PASSWORD", "Admin1234!")

# ── Server setup ─────────────────────────────────────────────────────────────

mcp = FastMCP(
    "Schaeffler Automat",
    instructions=(
        "MCP server for the Schaeffler Automat render pipeline. "
        "Provides tools to query orders, products, materials, render status, "
        "worker health, and run read-only SQL against the PostgreSQL database."
    ),
)

# ── Helpers ──────────────────────────────────────────────────────────────────


def _db_query(sql: str, params: tuple = ()) -> list[dict]:
    """Execute a read-only SQL query and return rows as dicts."""
    conn = psycopg2.connect(DB_URL)
    try:
        with conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor) as cur:
            cur.execute(sql, params)
            rows = cur.fetchall()
            result = []
            for row in rows:
                clean = {}
                for k, v in row.items():
                    if isinstance(v, datetime):
                        clean[k] = v.isoformat()
                    elif hasattr(v, "__str__") and not isinstance(
                        v, (str, int, float, bool, type(None), list, dict)
                    ):
                        clean[k] = str(v)
                    else:
                        clean[k] = v
                result.append(clean)
            return result
    finally:
        conn.close()


_token_cache: dict[str, str] = {}


def _api_token() -> str:
    """Get a cached API auth token."""
    if "token" in _token_cache:
        return _token_cache["token"]
    resp = httpx.post(
        f"{API_URL}/api/auth/login",
        json={"email": API_EMAIL, "password": API_PASSWORD},
    )
    resp.raise_for_status()
    _token_cache["token"] = resp.json()["access_token"]
    return _token_cache["token"]


def _api_get(path: str) -> dict | list:
    """Authenticated GET against the backend API."""
    resp = httpx.get(
        f"{API_URL}{path}",
        headers={"Authorization": f"Bearer {_api_token()}"},
        timeout=30,
    )
    resp.raise_for_status()
    return resp.json()


def _api_post(path: str, body: dict | None = None) -> dict | list:
    """Authenticated POST against the backend API."""
    resp = httpx.post(
        f"{API_URL}{path}",
        headers={"Authorization": f"Bearer {_api_token()}"},
        json=body or {},
        timeout=60,
    )
    resp.raise_for_status()
    return resp.json()


# ── Tools ────────────────────────────────────────────────────────────────────


@mcp.tool()
def query_database(sql: str) -> str:
    """Execute a read-only SQL query against the Schaeffler PostgreSQL database.

    Only SELECT queries are allowed. The database contains tables for orders,
    order_lines, products, cad_files, materials, material_aliases,
    output_types, media_assets, render_templates, and more.

    Args:
        sql: A SELECT SQL query to execute.
    """
    sql_upper = sql.strip().upper()
    if not sql_upper.startswith("SELECT") and not sql_upper.startswith("WITH"):
        return "Error: Only SELECT/WITH queries are allowed (read-only)."
    for kw in ("INSERT", "UPDATE", "DELETE", "DROP", "ALTER", "TRUNCATE", "CREATE"):
        # Check outside of string literals (simple heuristic)
        check = sql_upper.split("--")[0].split("/*")[0]
        if f" {kw} " in f" {check} ":
            return f"Error: {kw} statements are not allowed (read-only)."
    try:
        rows = _db_query(sql)
        if not rows:
            return "Query returned 0 rows."
        return json.dumps(rows[:100], indent=2, default=str)
    except Exception as e:
        return f"Query error: {e}"


@mcp.tool()
def list_orders(status: str = "", limit: int = 10) -> str:
    """List recent orders with their render progress.

    Args:
        status: Filter by status (draft, submitted, processing, completed, rejected). Empty for all.
        limit: Maximum number of orders (default 10, max 50).
    """
    limit = min(limit, 50)
    params = f"?limit={limit}"
    if status:
        params += f"&status={status}"
    data = _api_get(f"/api/orders{params}")
    summary = []
    for o in data:
        summary.append({
            "id": o["id"],
            "order_number": o["order_number"],
            "status": o["status"],
            "items": o.get("item_count", 0),
            "lines": o.get("line_count", 0),
            "render_progress": o.get("render_progress"),
            "created_at": o["created_at"],
        })
    return json.dumps(summary, indent=2)


@mcp.tool()
def get_order_detail(order_id: str) -> str:
    """Get detailed information about a specific order including all lines and render statuses.

    Args:
        order_id: UUID of the order.
    """
    data = _api_get(f"/api/orders/{order_id}")
    return json.dumps(data, indent=2, default=str)


@mcp.tool()
def search_products(query: str = "", category: str = "", limit: int = 20) -> str:
    """Search products in the product library.

    Args:
        query: Search text (matches name, PIM-ID, baureihe).
        category: Filter by category key.
        limit: Max results (default 20).
    """
    params = f"?limit={min(limit, 50)}"
    if query:
        params += f"&q={query}"
    if category:
        params += f"&category={category}"
    data = _api_get(f"/api/products{params}")
    summary = []
    for p in data:
        summary.append({
            "id": p["id"],
            "name": p["name"],
            "pim_id": p.get("pim_id"),
            "category": p.get("category_key"),
            "has_step": p.get("cad_file_id") is not None,
            "processing_status": p.get("processing_status"),
            "part_count": len(p.get("cad_part_materials") or []),
        })
    return json.dumps(summary, indent=2)


@mcp.tool()
def check_materials(order_id: str) -> str:
    """Check if all materials in an order are mapped to library materials.

    Returns unmapped materials with suggestions.

    Args:
        order_id: UUID of the order to check.
    """
    data = _api_get(f"/api/orders/{order_id}/check-materials")
    return json.dumps(data, indent=2)


@mcp.tool()
def list_materials(include_aliases: bool = False) -> str:
    """List all materials in the material library.

    Args:
        include_aliases: If true, include alias names for each material.
    """
    data = _api_get("/api/materials")
    if not include_aliases:
        for m in data:
            m.pop("aliases", None)
    return json.dumps(data, indent=2)


@mcp.tool()
def dispatch_renders(order_id: str) -> str:
    """Dispatch (or retry) renders for all pending/failed lines in an order.

    Args:
        order_id: UUID of the order.
    """
    data = _api_post(f"/api/orders/{order_id}/dispatch-renders")
    return json.dumps(data, indent=2)


@mcp.tool()
def get_worker_activity() -> str:
    """Get recent worker activity — last 30 STEP processing and render tasks with timing."""
    data = _api_get("/api/worker/activity")
    return json.dumps(data, indent=2, default=str)


@mcp.tool()
def get_render_stats() -> str:
    """Get render pipeline statistics: throughput, material coverage, product/order counts."""
    data = _api_get("/api/admin/dashboard-stats")
    return json.dumps(data, indent=2, default=str)


@mcp.tool()
def list_output_types() -> str:
    """List all configured output types with their render settings."""
    data = _api_get("/api/output-types?include_inactive=true")
    summary = []
    for ot in data:
        summary.append({
            "id": ot["id"],
            "name": ot["name"],
            "renderer": ot["renderer"],
            "format": ot["output_format"],
            "is_animation": ot["is_animation"],
            "material_override": ot.get("material_override"),
            "is_active": ot["is_active"],
            "render_settings": ot.get("render_settings", {}),
        })
    return json.dumps(summary, indent=2)


@mcp.tool()
def set_material_override(order_id: str, material_name: str = "") -> str:
    """Set a material override on all lines of an order (batch).

    All product parts will be rendered with this single material.
    Pass empty string to clear the override.

    Args:
        order_id: UUID of the order.
        material_name: SCHAEFFLER library material name, or empty to clear.
    """
    data = _api_post(
        f"/api/orders/{order_id}/batch-material-override",
        {"material_override": material_name or None},
    )
    return json.dumps(data, indent=2)


@mcp.tool()
def get_queue_status() -> str:
    """Get current render queue status — pending, active, completed/failed counts."""
    rows = _db_query("""
        SELECT
            (SELECT count(*) FROM order_lines
             WHERE render_status = 'pending') AS pending_renders,
            (SELECT count(*) FROM order_lines
             WHERE render_status = 'processing') AS active_renders,
            (SELECT count(*) FROM order_lines
             WHERE render_status = 'completed'
               AND render_completed_at > now() - interval '1 hour') AS completed_last_hour,
            (SELECT count(*) FROM order_lines
             WHERE render_status = 'failed'
               AND render_completed_at > now() - interval '1 hour') AS failed_last_hour,
            (SELECT count(*) FROM cad_files
             WHERE processing_status = 'processing') AS processing_step_files
    """)
    return json.dumps(rows[0] if rows else {}, indent=2)


# ── Resources ────────────────────────────────────────────────────────────────


@mcp.resource("schaeffler://schema")
def get_database_schema() -> str:
    """Database schema overview — table names and column types."""
    rows = _db_query("""
        SELECT table_name, column_name, data_type, is_nullable
        FROM information_schema.columns
        WHERE table_schema = 'public'
        ORDER BY table_name, ordinal_position
    """)
    tables: dict[str, list] = {}
    for r in rows:
        t = r["table_name"]
        if t not in tables:
            tables[t] = []
        tables[t].append(
            f"  {r['column_name']}: {r['data_type']}"
            + (" (nullable)" if r["is_nullable"] == "YES" else "")
        )
    lines = []
    for table, cols in sorted(tables.items()):
        lines.append(f"\n{table}:")
        lines.extend(cols)
    return "\n".join(lines)


@mcp.resource("schaeffler://output-types")
def get_output_types_resource() -> str:
    """All configured output types with settings."""
    data = _api_get("/api/output-types?include_inactive=true")
    return json.dumps(data, indent=2)


# ── Run ──────────────────────────────────────────────────────────────────────

if __name__ == "__main__":
    mcp.run()