"""Regression test for _isExternalSession helper covering messaging open-path (#3603).

After #3603 reclassified messaging sessions (Discord/Telegram/Slack) as
non-CLI, the session open path only triggered import_cli for `is_cli_session`
sessions, making messaging sessions click-to-open-but-can't-send.

This test pins:
- `_isExternalSession` exists in sessions.js
- The open-path gate at line ~5024 uses `_isExternalSession` (not just is_cli_session)
- The gateway-refresh gate at line ~3116 uses `_isExternalSession`
- The lineage-segment and child-session open gates use `_isExternalSession`
"""

import re


def _read_js():
    with open('static/sessions.js', encoding='utf-8') as f:
        return f.read()


def test_is_external_session_function_exists():
    """sessions.js must define _isExternalSession helper."""
    js = _read_js()
    assert re.search(r'function\s+_isExternalSession\s*\(', js), (
        '_isExternalSession function not found in sessions.js'
    )


def test_is_external_session_covers_messaging():
    """_isExternalSession must check both is_cli_session and _isMessagingSession."""
    js = _read_js()
    m = re.search(
        r'function\s+_isExternalSession\s*\([^)]*\)\s*\{([^}]*)\}',
        js,
        re.DOTALL,
    )
    assert m, '_isExternalSession function body not found'
    body = m.group(1)
    assert 'is_cli_session' in body, (
        '_isExternalSession must reference is_cli_session'
    )
    assert '_isMessagingSession' in body, (
        '_isExternalSession must reference _isMessagingSession'
    )


def test_open_path_uses_is_external_session():
    """Session open handler must use _isExternalSession for import gate."""
    js = _read_js()
    # The import gate in the session-click handler should use _isExternalSession
    assert re.search(
        r'if\s*\(\s*_isExternalSession\s*\(\s*s\s*\)\s*\)',
        js,
    ), 'Session open handler must use _isExternalSession(s) for import gate'


def test_gateway_refresh_uses_is_external_session():
    """Gateway SSE refresh must use _isExternalSession for active-session check."""
    js = _read_js()
    # Find the gateway SSE handler block (near line 3116)
    # It should have _isExternalSession(S.session)
    assert re.search(
        r'if\s*\(\s*S\.session\s*&&\s*!S\.busy\s*&&\s*_isExternalSession\s*\(\s*S\.session\s*\)\s*\)',
        js,
    ), 'Gateway SSE refresh must use _isExternalSession(S.session)'


def test_lineage_open_uses_is_external_session():
    """Lineage segment open handler must use _isExternalSession."""
    js = _read_js()
    assert re.search(
        r'if\s*\(\s*_isExternalSession\s*\(\s*seg\s*\)\s*\)',
        js,
    ), 'Lineage segment open must use _isExternalSession(seg)'


def test_child_session_open_uses_is_external_session():
    """Child session open handler must use _isExternalSession."""
    js = _read_js()
    assert re.search(
        r'if\s*\(\s*_isExternalSession\s*\(\s*(?:child|childSession)\s*\)\s*\)',
        js,
    ), 'Child session open must use _isExternalSession for the selected child session'