"""
Shared pytest fixtures for webui-mvp tests.

TEST ISOLATION:
  Tests run against a SEPARATE server instance on port 8788 with a
  completely separate state directory. Production data is never touched.
  The test state dir is wiped before each full test run and again on teardown.

PATH DISCOVERY:
  No hardcoded paths. Discovery order:
    1. Environment variables (HERMES_WEBUI_AGENT_DIR, HERMES_WEBUI_PYTHON, etc.)
    2. Sibling checkout heuristics relative to this repo
    3. Common install paths (~/.hermes/hermes-agent)
    4. System python3 as a last resort
"""
import json
import os
import pathlib
import shutil
import subprocess
import time
import urllib.request
import urllib.error
import pytest

# ── Repo root discovery ────────────────────────────────────────────────────
# conftest.py lives at <repo>/tests/conftest.py
TESTS_DIR  = pathlib.Path(__file__).parent.resolve()
REPO_ROOT  = TESTS_DIR.parent.resolve()
HOME       = pathlib.Path.home()
HERMES_HOME = pathlib.Path(os.getenv('HERMES_HOME', str(HOME / '.hermes')))

# ── Test server config ────────────────────────────────────────────────────
TEST_PORT      = int(os.getenv('HERMES_WEBUI_TEST_PORT', '8788'))
TEST_BASE      = f"http://127.0.0.1:{TEST_PORT}"
TEST_STATE_DIR = pathlib.Path(os.getenv(
    'HERMES_WEBUI_TEST_STATE_DIR',
    str(HERMES_HOME / 'webui-mvp-test')
))
TEST_WORKSPACE = TEST_STATE_DIR / 'test-workspace'

# ── Server script: always relative to repo root ───────────────────────────
SERVER_SCRIPT = REPO_ROOT / 'server.py'
if not SERVER_SCRIPT.exists():
    raise RuntimeError(
        f"server.py not found at {SERVER_SCRIPT}. "
        "Is conftest.py in the tests/ subdirectory of the repo?"
    )

# ── Hermes agent discovery (mirrors api/config._discover_agent_dir) ───────
def _discover_agent_dir() -> pathlib.Path:
    candidates = [
        os.getenv('HERMES_WEBUI_AGENT_DIR', ''),
        str(HERMES_HOME / 'hermes-agent'),
        str(REPO_ROOT.parent / 'hermes-agent'),
        str(HOME / '.hermes' / 'hermes-agent'),
        str(HOME / 'hermes-agent'),
    ]
    for c in candidates:
        if not c:
            continue
        p = pathlib.Path(c).expanduser()
        if p.exists() and (p / 'run_agent.py').exists():
            return p.resolve()
    return None

# ── Python discovery (mirrors api/config._discover_python) ────────────────
def _discover_python(agent_dir) -> str:
    if os.getenv('HERMES_WEBUI_PYTHON'):
        return os.getenv('HERMES_WEBUI_PYTHON')
    if agent_dir:
        venv_py = agent_dir / 'venv' / 'bin' / 'python'
        if venv_py.exists():
            return str(venv_py)
    local_venv = REPO_ROOT / '.venv' / 'bin' / 'python'
    if local_venv.exists():
        return str(local_venv)
    return shutil.which('python3') or shutil.which('python') or 'python3'

HERMES_AGENT = _discover_agent_dir()
VENV_PYTHON  = _discover_python(HERMES_AGENT)

# Work dir: agent dir if found, else repo root
WORKDIR = str(HERMES_AGENT) if HERMES_AGENT else str(REPO_ROOT)


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

def _post(base, path, body=None):
    data = json.dumps(body or {}).encode()
    req = urllib.request.Request(
        base + path, data=data, headers={"Content-Type": "application/json"}
    )
    try:
        with urllib.request.urlopen(req, timeout=10) as r:
            return json.loads(r.read())
    except urllib.error.HTTPError as e:
        try:
            return json.loads(e.read())
        except Exception:
            return {}


def _wait_for_server(base, timeout=20):
    deadline = time.time() + timeout
    while time.time() < deadline:
        try:
            with urllib.request.urlopen(base + "/health", timeout=2) as r:
                if json.loads(r.read()).get("status") == "ok":
                    return True
        except Exception:
            time.sleep(0.3)
    return False


# ── Session-scoped test server ────────────────────────────────────────────────

@pytest.fixture(scope="session", autouse=True)
def test_server():
    """
    Start an isolated test server on TEST_PORT with a clean state directory.
    Paths are discovered dynamically -- no hardcoded absolute path assumptions.
    """
    # Clean slate
    if TEST_STATE_DIR.exists():
        shutil.rmtree(TEST_STATE_DIR)
    TEST_STATE_DIR.mkdir(parents=True)
    TEST_WORKSPACE.mkdir(parents=True)

    # Symlink real skills into test home so skill-related tests work,
    # but all write-heavy state stays isolated.
    real_skills  = HERMES_HOME / 'skills'
    test_skills  = TEST_STATE_DIR / 'skills'
    if real_skills.exists() and not test_skills.exists():
        test_skills.symlink_to(real_skills)

    # Isolated cron state
    (TEST_STATE_DIR / 'cron').mkdir(parents=True, exist_ok=True)

    env = os.environ.copy()
    env.update({
        "HERMES_WEBUI_PORT":              str(TEST_PORT),
        "HERMES_WEBUI_HOST":              "127.0.0.1",
        "HERMES_WEBUI_STATE_DIR":         str(TEST_STATE_DIR),
        "HERMES_WEBUI_DEFAULT_WORKSPACE": str(TEST_WORKSPACE),
        "HERMES_WEBUI_DEFAULT_MODEL":     "openai/gpt-5.4-mini",
        "HERMES_HOME":                    str(TEST_STATE_DIR),
    })

    # Pass agent dir if discovered so server.py doesn't have to re-discover
    if HERMES_AGENT:
        env["HERMES_WEBUI_AGENT_DIR"] = str(HERMES_AGENT)

    proc = subprocess.Popen(
        [VENV_PYTHON, str(SERVER_SCRIPT)],
        cwd=WORKDIR,
        env=env,
        stdout=subprocess.DEVNULL,
        stderr=subprocess.DEVNULL,
    )

    if not _wait_for_server(TEST_BASE, timeout=20):
        proc.kill()
        pytest.fail(
            f"Test server on port {TEST_PORT} did not start within 20s.\n"
            f"  server.py : {SERVER_SCRIPT}\n"
            f"  python    : {VENV_PYTHON}\n"
            f"  agent dir : {HERMES_AGENT}\n"
            f"  workdir   : {WORKDIR}\n"
        )

    yield proc

    proc.terminate()
    try:
        proc.wait(timeout=5)
    except subprocess.TimeoutExpired:
        proc.kill()

    try:
        shutil.rmtree(TEST_STATE_DIR)
    except Exception:
        pass


# ── Test base URL ─────────────────────────────────────────────────────────────

@pytest.fixture(scope="session")
def base_url():
    return TEST_BASE


# ── Per-test session cleanup ──────────────────────────────────────────────────

@pytest.fixture(autouse=True)
def cleanup_test_sessions():
    """
    Yields a list for tests to register created session IDs.
    Deletes all registered sessions after each test.
    Resets last_workspace to the test workspace to prevent state bleed.
    """
    created: list[str] = []
    yield created

    for sid in created:
        try:
            _post(TEST_BASE, "/api/session/delete", {"session_id": sid})
        except Exception:
            pass

    try:
        _post(TEST_BASE, "/api/sessions/cleanup_zero_message")
    except Exception:
        pass

    try:
        last_ws_file = TEST_STATE_DIR / "last_workspace.txt"
        last_ws_file.write_text(str(TEST_WORKSPACE), encoding='utf-8')
    except Exception:
        pass


# ── Convenience helpers ────────────────────────────────────────────────────────

def make_session_tracked(created_list, ws=None):
    """
    Create a session on the test server and register it for cleanup.

    Usage:
        def test_something(cleanup_test_sessions):
            sid, ws = make_session_tracked(cleanup_test_sessions)
    """
    body = {}
    if ws:
        body["workspace"] = str(ws)
    d = _post(TEST_BASE, "/api/session/new", body)
    sid = d["session"]["session_id"]
    ws_path = pathlib.Path(d["session"]["workspace"])
    created_list.append(sid)
    return sid, ws_path