"""
Smoke test for the EPANET MCP Space.

Runs the full MCP handshake (initialize -> tools/list -> tools/call) against a
running server over BOTH transports, and verifies the API-key gate. This is the
transport-level proof that every target client can connect:

    Streamable HTTP  -> HuggingChat, Codex, Perplexity, Gemini, ChatGPT (dev)
    SSE              -> Claude Desktop (via mcp-remote) and other legacy clients

Usage:
    python smoke_test.py --base-url http://127.0.0.1:7860 [--api-key KEY]
"""

from __future__ import annotations

import argparse
import asyncio
import sys

import httpx
from mcp import ClientSession
from mcp.client.sse import sse_client
from mcp.client.streamable_http import streamablehttp_client

PASS, FAIL = "✅", "❌"
results: list[tuple[str, bool, str]] = []


def record(name: str, ok: bool, detail: str = "") -> None:
    results.append((name, ok, detail))
    print(f"  {PASS if ok else FAIL} {name}" + (f" — {detail}" if detail else ""))


def _headers(api_key: str | None) -> dict:
    return {"Authorization": f"Bearer {api_key}"} if api_key else {}


async def exercise(session: ClientSession, transport: str) -> None:
    await session.initialize()
    record(f"[{transport}] initialize", True)

    tools = (await session.list_tools()).tools
    names = {t.name for t in tools}
    record(f"[{transport}] tools/list", len(tools) > 0, f"{len(tools)} tools")

    expected = {"load_network", "get_network_summary", "run_hydraulic_simulation",
                "list_bundled_networks", "create_leakage_event"}
    missing = expected - names
    record(f"[{transport}] core tools present", not missing,
           "all present" if not missing else f"missing {missing}")

    # Functional round-trip: list bundled -> load Net1 -> summarise
    r = await session.call_tool("list_bundled_networks", {})
    record(f"[{transport}] call list_bundled_networks", not r.isError)

    r = await session.call_tool("load_network", {"path": "Net1.inp", "network_id": f"smoke_{transport}"})
    record(f"[{transport}] call load_network(Net1)", not r.isError)

    r = await session.call_tool("get_network_summary", {"network_id": f"smoke_{transport}"})
    text = (r.content[0].text if r.content else "")
    ok = (not r.isError) and ("junctions" in text or "nodes" in text)
    record(f"[{transport}] call get_network_summary", ok,
           "summary returned" if ok else "unexpected payload")


async def test_streamable(base_url: str, api_key: str | None) -> None:
    print("\n▶ Streamable HTTP  (/mcp)")
    url = f"{base_url}/mcp"
    try:
        async with streamablehttp_client(url, headers=_headers(api_key)) as (r, w, _):
            async with ClientSession(r, w) as session:
                await exercise(session, "http")
    except Exception as e:  # noqa: BLE001
        record("[http] connection", False, repr(e))


async def test_sse(base_url: str, api_key: str | None) -> None:
    print("\n▶ SSE  (/sse)")
    url = f"{base_url}/sse"
    try:
        async with sse_client(url, headers=_headers(api_key)) as (r, w):
            async with ClientSession(r, w) as session:
                await exercise(session, "sse")
    except Exception as e:  # noqa: BLE001
        record("[sse] connection", False, repr(e))


async def test_health_and_auth(base_url: str, api_key: str | None) -> None:
    print("\n▶ Health + auth gate")
    async with httpx.AsyncClient(timeout=15) as c:
        try:
            resp = await c.get(f"{base_url}/health")
            record("health returns 200/ok", resp.status_code == 200 and resp.text.strip() == "ok")
        except Exception as e:  # noqa: BLE001
            record("health probe", False, repr(e))

        if api_key:
            # No key -> must be 401 on a protected endpoint
            try:
                resp = await c.post(f"{base_url}/mcp",
                                    json={"jsonrpc": "2.0", "id": 1, "method": "ping"},
                                    headers={"Accept": "application/json, text/event-stream"})
                record("unauthenticated /mcp rejected (401)", resp.status_code == 401,
                       f"status {resp.status_code}")
            except Exception as e:  # noqa: BLE001
                record("unauthenticated /mcp rejected", False, repr(e))
        else:
            record("auth gate", True, "open mode (no key configured) — skipped")


async def main() -> int:
    ap = argparse.ArgumentParser()
    ap.add_argument("--base-url", default="http://127.0.0.1:7860")
    ap.add_argument("--api-key", default=None)
    args = ap.parse_args()
    base = args.base_url.rstrip("/")

    print(f"Target: {base}   auth={'on' if args.api_key else 'off'}")
    await test_health_and_auth(base, args.api_key)
    await test_streamable(base, args.api_key)
    await test_sse(base, args.api_key)

    passed = sum(1 for _, ok, _ in results if ok)
    total = len(results)
    print(f"\n{'='*48}\nRESULT: {passed}/{total} checks passed")
    failed = [n for n, ok, _ in results if not ok]
    if failed:
        print("Failed:", ", ".join(failed))
    return 0 if passed == total else 1


if __name__ == "__main__":
    sys.exit(asyncio.run(main()))