# coding=utf-8
import os
from pathlib import Path

import pytest
from fastapi.testclient import TestClient

from spark_executor.core import connection_store, pending_store
from spark_executor.core.connection_store import ConnectionStore
from spark_executor.core.pending_store import PendingStore
from spark_executor.models import Connection
from spark_executor.server import app
from spark_executor.tools import connections, submit


@pytest.fixture(autouse=True)
def _fresh_data(tmp_path: Path, monkeypatch):
    """Reset both stores to a fresh tmp dir and rebind the singletons that
    the tool modules captured at import time."""
    monkeypatch.setattr(connection_store, "DEFAULT_DATA_DIR", str(tmp_path))
    monkeypatch.setattr(connection_store, "store", ConnectionStore())
    monkeypatch.setattr(pending_store, "DEFAULT_DATA_DIR", str(tmp_path))
    monkeypatch.setattr(pending_store, "store", PendingStore())
    # Rebind imports inside the tool modules (captured at import time)
    connections.store = connection_store.store
    submit.conn_store = connection_store.store
    submit.pending_store = pending_store.store


def test_health_still_present():
    c = TestClient(app)
    r = c.get("/health")
    assert r.status_code == 200
    assert r.json() == {"status": "ok"}


def test_sixteen_tool_routes_registered():
    paths = {r.path for r in app.routes}
    for path in (
        # pending-submission flow (5)
        "/prepare_submit_job",
        "/confirm_submit_job",
        "/list_pending_jobs",
        "/get_pending_job",
        "/cancel_pending_job",
        # job lifecycle (3)
        "/get_job_status",
        "/get_job_logs",
        "/kill_job",
        # connection management (4)
        "/save_connection",
        "/list_connections",
        "/get_connection",
        "/delete_connection",
        # LLM-driven PySpark generation (3) — Stage 2
        "/write_job_file",
        "/read_job_file",
        "/update_job_file",
    ):
        assert path in paths, f"missing MCP tool route: {path}"


def test_seventeen_tool_routes_registered():
    paths = {r.path for r in app.routes}
    assert "/update_pending_job" in paths


def test_twenty_three_tool_routes_registered():
    paths = {r.path for r in app.routes}
    for path in (
        "/get_external_job_logs",
        "/get_external_job_status",
        "/get_external_job_result",
        "/list_applications",
        "/fetch_url",
        "/update_connection",
    ):
        assert path in paths, f"missing MCP tool route: {path}"


# --- operation_id: pin clean MCP tool names (no auto-generated suffixes) ---
#
# fastapi-mcp uses each route's OpenAPI `operationId` as the MCP tool name
# exposed to LLM clients (fastapi_mcp/server.py:619-620). If we omit
# `operation_id=`, FastAPI auto-generates a name like
# `prepare_submit_job_prepare_submit_job_post` (function_name + path +
# method), which is ugly for the agent. This test asserts every MCP tool
# route has an explicit, clean operation_id matching its handler.

# Set of routes that are NOT MCP tools (no operation_id expected).
_NON_MCP_PATHS = {"/health", "/openapi.json", "/docs", "/docs/oauth2-redirect", "/redoc"}


def test_every_mcp_route_has_explicit_clean_operation_id():
    c = TestClient(app)
    openapi = c.get("/openapi.json").json()
    paths = openapi["paths"]

    seen: list[tuple[str, str, str]] = []  # (path, method, operation_id)
    for path, methods in paths.items():
        if path in _NON_MCP_PATHS:
            continue
        for method, op in methods.items():
            if method.upper() not in {"GET", "POST", "PUT", "DELETE", "PATCH"}:
                continue
            op_id = op.get("operationId")
            assert op_id, (
                f"route {method.upper()} {path} has no operationId in OpenAPI — "
                f"fastapi-mcp will fall back to an auto-generated name like "
                f"`{path.strip('/').replace('/', '_')}_{method}_...` and expose "
                f"that to LLM clients. Add an explicit `operation_id=` to the decorator."
            )
            # Reject FastAPI's auto-generated format: it always embeds the
            # HTTP method as a `_post`/`_get` suffix, and repeats the path.
            assert not op_id.endswith(f"_{method}"), (
                f"route {method.upper()} {path} has auto-generated operationId "
                f"{op_id!r} (ends with `_{method}`). Add an explicit "
                f"`operation_id=` to the decorator."
            )
            seen.append((path, method.upper(), op_id))

    # Sanity: we expect at least the 16 MCP tool routes from the project.
    assert len(seen) >= 16, f"only found {len(seen)} MCP tool routes, expected >=16: {seen}"

    # Every operation_id must be unique — fastapi-mcp's tool registry keys
    # by name, so duplicates would silently shadow one another.
    ids = [op_id for _, _, op_id in seen]
    dupes = [x for x in set(ids) if ids.count(x) > 1]
    assert not dupes, f"duplicate operation_ids: {dupes}"


# --- End-to-end body-based calls (the gap the route-registration test missed) ---

def test_save_connection_accepts_dict_spark_conf_in_body():
    """The original query-param signature returned 422 for spark_conf dicts;
    body models make tools/call roundtrip cleanly."""
    c = TestClient(app)
    r = c.post(
        "/save_connection",
        json={
            "name": "prod",
            "master": "yarn",
            "deploy_mode": "cluster",
            "spark_conf": {"spark.sql.shuffle.partitions": "200"},
        },
    )
    assert r.status_code == 200, r.text
    assert r.json() == {"name": "prod", "status": "SAVED"}


def test_prepare_submit_job_works_via_body(tmp_path):
    c = TestClient(app)
    c.post("/save_connection", json={"name": "prod", "master": "yarn"})
    # The script must exist (Stage 2 cleanup) — write a real file first.
    script = tmp_path / "demo.py"
    script.write_text("print('hi')\n")
    r = c.post(
        "/prepare_submit_job",
        json={
            "connection": "prod",
            "script_path": str(script),
            "queue": "research",
            "executor_memory": "2G",
            "executor_cores": 2,
            "num_executors": 2,
            "app_name": "test-app",
        },
    )
    assert r.status_code == 200, r.text
    body = r.json()
    assert body["status"] == "PENDING"
    assert body["pending_id"].startswith("p_")
    assert body["parameters"]["queue"] == "research"
    assert body["parameters"]["master"] == "yarn"  # snapshotted from connection


def test_prepare_rejects_unconfirmed_defaults(tmp_path):
    c = TestClient(app)
    c.post("/save_connection", json={"name": "prod", "master": "yarn"})
    script = tmp_path / "demo.py"
    script.write_text("print('hi')\n")
    r = c.post(
        "/prepare_submit_job",
        json={
            "connection": "prod",
            "script_path": str(script),
            "app_name": "test-app",
        },
    )
    assert r.status_code == 400
    detail = r.json()["detail"]
    assert "Please confirm default values" in detail
    assert "queue='default'" in detail
    assert "executor_memory='2G'" in detail
    assert "executor_cores=2" in detail
    assert "num_executors=2" in detail


def test_prepare_accepts_confirmed_defaults(tmp_path):
    c = TestClient(app)
    c.post("/save_connection", json={"name": "prod", "master": "yarn"})
    script = tmp_path / "demo.py"
    script.write_text("print('hi')\n")
    r = c.post(
        "/prepare_submit_job",
        json={
            "connection": "prod",
            "script_path": str(script),
            "queue": "default",
            "executor_memory": "2G",
            "executor_cores": 2,
            "num_executors": 2,
            "app_name": "test-app",
        },
    )
    assert r.status_code == 200
    body = r.json()
    assert body["status"] == "PENDING"
    assert body["parameters"]["queue"] == "default"
    assert body["parameters"]["executor_memory"] == "2G"
    assert body["parameters"]["executor_cores"] == 2
    assert body["parameters"]["num_executors"] == 2


def test_prepare_rejects_nonexistent_script_path_with_400():
    """MCP clients should see a clean 400 with a remediation hint, not a 500."""
    c = TestClient(app)
    c.post("/save_connection", json={"name": "prod", "master": "yarn"})
    r = c.post(
        "/prepare_submit_job",
        json={
            "connection": "prod",
            "script_path": "/nope/does_not_exist.py",
            "queue": "default",
            "executor_memory": "2G",
            "executor_cores": 2,
            "num_executors": 2,
            "app_name": "test-app",
        },
    )
    assert r.status_code == 400
    detail = r.json()["detail"]
    # The message must guide the agent to the right next step
    assert "does not exist" in detail
    assert "write_job_file" in detail


def test_prepare_rejects_sql_policy_violation_with_400(tmp_path):
    """SQL guard: even if the file exists, prepare_submit_job must reject
    code containing DROP/DELETE/etc. (defense in depth — write_job_file
    also enforces this, but a host-mounted file might bypass that)."""
    c = TestClient(app)
    c.post("/save_connection", json={"name": "prod", "master": "yarn"})
    bad_script = tmp_path / "evil.py"
    bad_script.write_text('spark.sql("DROP TABLE users")\n')
    r = c.post(
        "/prepare_submit_job",
        json={
            "connection": "prod",
            "script_path": str(bad_script),
            "queue": "default",
            "executor_memory": "2G",
            "executor_cores": 2,
            "num_executors": 2,
            "app_name": "test-app",
        },
    )
    assert r.status_code == 400
    detail = r.json()["detail"]
    assert "DROP" in detail
    assert "SELECT" in detail and "INSERT" in detail  # the policy is explained


def test_write_rejects_sql_policy_violation_with_400(tmp_path):
    """Same policy at write_job_file — agent gets immediate feedback
    before the file is even written to disk."""
    from common import config
    config.settings.jobs_dir = str(tmp_path / "jobs")
    c = TestClient(app)
    r = c.post(
        "/write_job_file",
        json={"code": 'spark.sql("DELETE FROM events")\n'},
    )
    assert r.status_code == 400
    detail = r.json()["detail"]
    assert "DELETE" in detail
    # And the file should NOT have been written
    assert list(tmp_path.glob("*.py")) == []


# --- Stage 2: read_job_file / update_job_file ---

def test_read_job_file_returns_content_via_mcp(tmp_path):
    c = TestClient(app)
    script = tmp_path / "demo.py"
    script.write_text("print('hello from read_job_file')\n")
    r = c.post("/read_job_file", json={"script_path": str(script)})
    assert r.status_code == 200
    body = r.json()
    assert body["content"] == "print('hello from read_job_file')\n"
    assert body["path"] == str(script)


def test_read_job_file_404_for_missing_file(tmp_path):
    c = TestClient(app)
    r = c.post("/read_job_file", json={"script_path": str(tmp_path / "nope.py")})
    assert r.status_code == 400
    assert "does not exist" in r.json()["detail"]


def test_update_job_file_writes_and_reads_back(tmp_path):
    from common import config
    config.settings.jobs_dir = str(tmp_path)
    c = TestClient(app)
    script = tmp_path / "edit.py"
    script.write_text("v1\n")
    # Update
    r1 = c.post("/update_job_file", json={"script_path": str(script), "content": "v2\n"})
    assert r1.status_code == 200
    assert r1.json()["bytes_written"] == 3
    # Read back
    r2 = c.post("/read_job_file", json={"script_path": str(script)})
    assert r2.json()["content"] == "v2\n"


def test_update_job_file_rejects_paths_outside_jobs_dir(tmp_path):
    from common import config
    config.settings.jobs_dir = str(tmp_path / "jobs")
    c = TestClient(app)
    other = tmp_path / "elsewhere.py"
    other.write_text("x\n")
    r = c.post("/update_job_file", json={"script_path": str(other), "content": "y\n"})
    assert r.status_code == 400
    assert "must be under" in r.json()["detail"]


def test_list_and_get_pending_job_roundtrip_via_body(tmp_path):
    c = TestClient(app)
    c.post("/save_connection", json={"name": "prod", "master": "yarn"})
    script = tmp_path / "a.py"
    script.write_text("print('hi')\n")
    prep = c.post(
        "/prepare_submit_job",
        json={
            "connection": "prod",
            "script_path": str(script),
            "queue": "default",
            "executor_memory": "2G",
            "executor_cores": 2,
            "num_executors": 2,
            "app_name": "test-app",
        },
    ).json()
    pid = prep["pending_id"]

    listed = c.post("/list_pending_jobs", json={}).json()
    assert any(p["pending_id"] == pid for p in listed)

    got = c.post("/get_pending_job", json={"pending_id": pid}).json()
    assert got["script_path"] == str(script)
    assert got["status"] == "PENDING"


def test_list_connections_works_with_empty_body():
    c = TestClient(app)
    r = c.post("/list_connections", json={})
    assert r.status_code == 200
    assert r.json() == []


# --- Stage 2: write_job_file ---

def test_write_job_file_accepts_code_string_in_body(tmp_path, monkeypatch):
    """End-to-end: a Pydantic body model lets tools/call pass a code string
    that FastAPI would reject if it were a query parameter (length limits)."""
    monkeypatch.chdir(tmp_path)
    c = TestClient(app)
    code = "print('from MCP integration test')\n" * 100  # > FastAPI query limit
    r = c.post("/write_job_file", json={"code": code})
    assert r.status_code == 200, r.text
    p = r.json()["script_path"]
    assert os.path.isfile(p)
    with open(p) as f:
        assert f.read() == code


# --- Exception handlers: KeyError -> 404, ValueError -> 400 ---

def test_unknown_job_id_returns_404():
    c = TestClient(app)
    r = c.post("/get_job_status", json={"job_id": "missing"})
    assert r.status_code == 404
    assert "missing" in r.json()["detail"]


def test_unknown_pending_id_returns_404():
    c = TestClient(app)
    r = c.post("/get_pending_job", json={"pending_id": "p_nope"})
    assert r.status_code == 404
    assert "p_nope" in r.json()["detail"]


def test_unknown_connection_name_returns_404():
    c = TestClient(app)
    r = c.post("/get_connection", json={"name": "nope"})
    assert r.status_code == 404
    assert "nope" in r.json()["detail"]


def test_unknown_connection_in_prepare_returns_404():
    c = TestClient(app)
    r = c.post(
        "/prepare_submit_job",
        json={
            "connection": "nope",
            "script_path": "/tmp/x.py",
            "queue": "default",
            "executor_memory": "2G",
            "executor_cores": 2,
            "num_executors": 2,
            "app_name": "test-app",
        },
    )
    assert r.status_code == 404
    assert "nope" in r.json()["detail"]


def test_confirm_non_pending_returns_400(tmp_path):
    """A CANCELLED pending should refuse confirm; FastAPI should surface ValueError as 400."""
    c = TestClient(app)
    c.post("/save_connection", json={"name": "prod", "master": "yarn"})
    script = tmp_path / "x.py"
    script.write_text("print('hi')\n")
    prep = c.post(
        "/prepare_submit_job",
        json={
            "connection": "prod",
            "script_path": str(script),
            "queue": "default",
            "executor_memory": "2G",
            "executor_cores": 2,
            "num_executors": 2,
            "app_name": "test-app",
        },
    ).json()
    pid = prep["pending_id"]
    c.post("/cancel_pending_job", json={"pending_id": pid})
    r = c.post("/confirm_submit_job", json={"pending_id": pid})
    assert r.status_code == 400
    assert "CANCELLED" in r.json()["detail"]


def test_cancel_already_submitted_returns_400(tmp_path):
    """Cancelling a SUBMITTED pending should refuse with ValueError -> 400."""
    c = TestClient(app)
    c.post("/save_connection", json={"name": "prod", "master": "yarn"})
    script = tmp_path / "x.py"
    script.write_text("print('hi')\n")
    prep = c.post(
        "/prepare_submit_job",
        json={
            "connection": "prod",
            "script_path": str(script),
            "queue": "default",
            "executor_memory": "2G",
            "executor_cores": 2,
            "num_executors": 2,
            "app_name": "test-app",
        },
    ).json()
    pid = prep["pending_id"]
    # Simulate a SUBMITTED state by mutating the pending directly
    p = pending_store.store.get(pid)
    p.status = "SUBMITTED"
    pending_store.store.save(p)
    r = c.post("/cancel_pending_job", json={"pending_id": pid})
    assert r.status_code == 400
    assert "SUBMITTED" in r.json()["detail"]


# --- update_pending_job route ---

def test_update_pending_job_route(tmp_path):
    c = TestClient(app)
    c.post("/save_connection", json={"name": "prod", "master": "yarn"})
    script = tmp_path / "x.py"
    script.write_text("print('hi')\n")
    prep = c.post(
        "/prepare_submit_job",
        json={
            "connection": "prod",
            "script_path": str(script),
            "queue": "default",
            "executor_memory": "2G",
            "executor_cores": 2,
            "num_executors": 2,
            "app_name": "test-app",
        },
    ).json()
    pid = prep["pending_id"]

    r = c.post(
        "/update_pending_job",
        json={"pending_id": pid, "queue": "research"},
    )
    assert r.status_code == 200, r.text
    assert r.json()["status"] == "PENDING"
    assert r.json()["parameters"]["queue"] == "research"

    got = c.post("/get_pending_job", json={"pending_id": pid}).json()
    assert got["queue"] == "research"
    # untouched fields are preserved
    assert got["executor_memory"] == "2G"
    assert got["app_name"] == "test-app"


def test_update_pending_job_route_rejects_submitted(tmp_path, monkeypatch):
    c = TestClient(app)
    c.post("/save_connection", json={"name": "prod", "master": "yarn"})
    script = tmp_path / "x.py"
    script.write_text("print('hi')\n")
    prep = c.post(
        "/prepare_submit_job",
        json={
            "connection": "prod",
            "script_path": str(script),
            "queue": "default",
            "executor_memory": "2G",
            "executor_cores": 2,
            "num_executors": 2,
            "app_name": "test-app",
        },
    ).json()
    pid = prep["pending_id"]
    fake_proc = type("P", (), {
        "returncode": 0,
        "stderr": "tracking URL: http://rm:8088/proxy/application_17400000001/\n",
    })()
    monkeypatch.setattr(submit, "run_spark_submit", lambda _cmd: fake_proc)
    c.post("/confirm_submit_job", json={"pending_id": pid})

    r = c.post(
        "/update_pending_job",
        json={"pending_id": pid, "queue": "research"},
    )
    assert r.status_code == 400
    assert "only PENDING submissions can be updated" in r.json()["detail"]


# --- YarnError -> 502 handler ---


def test_yarn_error_returns_502_with_detail(tmp_path, monkeypatch):
    """When a YARN REST call raises YarnError (host unreachable, YARN
    returned 4xx/5xx, parse failure), the route must surface HTTP 502
    with the YarnError message in the detail — not 500 'Internal
    Server Error' with no info. Mirrors the same fix for fetch_url.
    """
    from unittest.mock import patch
    from spark_executor.core.yarn_client import YarnError

    connection_store.store.save(
        Connection(
            name="prod",
            master="yarn",
            yarn_rm_url="http://ccam1:8088",
        )
    )
    c = TestClient(app)
    with patch(
        "spark_executor.tools.status.get_application_status",
        side_effect=YarnError("YARN connection failed: ConnectError: Connection refused"),
    ):
        r = c.post(
            "/get_job_status",
            json={"job_id": "a1b2c3d4e5f6"},
        )
    assert r.status_code == 502
    detail = r.json()["detail"]
    assert "YARN connection failed" in detail
    assert "Connection refused" in detail


def test_external_job_status_returns_502_on_yarn_error(tmp_path):
    """get_external_job_status uses get_application_status under the
    hood — same handler, same 502, same detail."""
    from unittest.mock import patch
    from spark_executor.core.yarn_client import YarnError

    connection_store.store.save(
        Connection(
            name="prod",
            master="yarn",
            yarn_rm_url="http://ccam1:8088",
        )
    )
    c = TestClient(app)
    with patch(
        "spark_executor.tools.external_jobs.get_application_status",
        side_effect=YarnError("YARN application 'application_xxx' not found"),
    ):
        r = c.post(
            "/get_external_job_status",
            json={"application_id": "application_1740000000001_0001", "connection_name": "prod"},
        )
    assert r.status_code == 502
    assert "not found" in r.json()["detail"]


def test_external_job_result_returns_502_on_yarn_error(tmp_path):
    """get_external_job_result also uses get_application_status (same
    underlying YARN endpoint), and exercises the same YarnError path."""
    from unittest.mock import patch
    from spark_executor.core.yarn_client import YarnError

    connection_store.store.save(
        Connection(
            name="prod",
            master="yarn",
            yarn_rm_url="http://ccam1:8088",
        )
    )
    c = TestClient(app)
    with patch(
        "spark_executor.tools.external_jobs.get_application_status",
        side_effect=YarnError("YARN connection failed: ConnectError: Connection refused"),
    ):
        r = c.post(
            "/get_external_job_result",
            json={"application_id": "application_1740000000001_0001", "connection_name": "prod"},
        )
    assert r.status_code == 502
    assert "YARN connection failed" in r.json()["detail"]


def test_external_job_logs_returns_502_on_yarn_error(tmp_path):
    """get_external_job_logs uses get_application_logs — different
    function, but raises YarnError the same way. Handler must catch
    it the same way."""
    from unittest.mock import patch
    from spark_executor.core.yarn_client import YarnError

    connection_store.store.save(
        Connection(
            name="prod",
            master="yarn",
            yarn_rm_url="http://ccam1:8088",
        )
    )
    c = TestClient(app)
    with patch(
        "spark_executor.tools.external_jobs.get_application_logs",
        side_effect=YarnError("YARN GET logs returned HTTP 500: cluster overloaded"),
    ):
        r = c.post(
            "/get_external_job_logs",
            json={
                "application_id": "application_1740000000001_0001",
                "connection_name": "prod",
                "tail_chars": 5000,
            },
        )
    assert r.status_code == 502
    assert "YARN GET logs returned HTTP 500" in r.json()["detail"]
    assert "cluster overloaded" in r.json()["detail"]


def test_list_applications_returns_502_on_yarn_error(tmp_path):
    """list_applications uses list_applications_yarn — yet another
    YARN-touching tool. Same YarnError -> 502 contract."""
    from unittest.mock import patch
    from spark_executor.core.yarn_client import YarnError

    connection_store.store.save(
        Connection(
            name="prod",
            master="yarn",
            yarn_rm_url="http://ccam1:8088",
        )
    )
    c = TestClient(app)
    with patch(
        "spark_executor.tools.external_jobs.list_applications_yarn",
        side_effect=YarnError("YARN list applications failed: 503 Service Unavailable"),
    ):
        r = c.post(
            "/list_applications",
            json={"connection_name": "prod"},
        )
    assert r.status_code == 502
    assert "YARN list applications failed" in r.json()["detail"]