"""Every page below a top-level section shows its trail back up (rule 134).

The breadcrumb block is empty by default, so a nested page that forgets it
ships with no way back up and nothing says so. Every full page (one that
extends base.html) must fill the block, unless it is a section's own top
page, a logged-out page or an error page: those are named below, so adding
one is a decision someone makes in this file.
"""
import re

from tests._templates import REPO, template_files

TOP_LEVEL = {
    "steward/templates/dashboard/index.html",
    "steward/templates/hosts/list.html",
    "steward/templates/monitors/index.html",
    "steward/templates/alerts/list.html",
    "steward/templates/ansible/index.html",
    "steward/templates/audit/list.html",
    "steward/templates/ai_access/index.html",
    "steward/templates/account/index.html",
    "plugins/docker/templates/docker/index.html",
    "plugins/snmp/templates/snmp/index.html",
    "plugins/prometheus/templates/prometheus/index.html",
    "plugins/traefik/templates/traefik/index.html",
    "plugins/unifi/templates/unifi/index.html",
    "plugins/syslog/templates/syslog/index.html",
    # Logged out, or no page to go back up from.
    "steward/templates/auth/login.html",
    "steward/templates/auth/setup.html",
    "steward/templates/auth/invite.html",
    "steward/templates/auth/forgot.html",
    "steward/templates/auth/reset.html",
    "steward/templates/errors/404.html",
    "steward/templates/errors/500.html",
    "steward/templates/errors/database_unavailable.html",
    "steward/templates/errors/restoring.html",
}

_EXTENDS_BASE = re.compile(r"""\{%-?\s*extends\s+["']base\.html["']""")
_BLOCK = re.compile(r"\{%-?\s*block\s+breadcrumb\s*-?%\}(.*?)\{%-?\s*endblock", re.S)


def needs_crumbs_and_lacks_them(text: str) -> bool:
    block = _BLOCK.search(text)
    return bool(_EXTENDS_BASE.search(text)) and not (block and "crumbs(" in block.group(1))


def test_the_guard_can_fail():
    assert needs_crumbs_and_lacks_them('{% extends "base.html" %}{% block content %}x{% endblock %}')
    assert needs_crumbs_and_lacks_them('{% extends "base.html" %}{% block breadcrumb %}{% endblock %}')
    assert not needs_crumbs_and_lacks_them(
        '{% extends "base.html" %}{% block breadcrumb %}{{ crumbs([("Hosts", "/hosts/"), ("x", "")]) }}{% endblock %}')
    assert not needs_crumbs_and_lacks_them("<tr><td>a fragment</td></tr>")


def test_every_nested_page_has_a_trail():
    pages = {str(p.relative_to(REPO)): p for p in template_files()}
    assert TOP_LEVEL <= set(pages), sorted(TOP_LEVEL - set(pages))  # a renamed page leaves no stale entry
    missing = sorted(name for name, p in pages.items()
                     if name not in TOP_LEVEL and needs_crumbs_and_lacks_them(p.read_text()))
    assert not missing, f"add {{% block breadcrumb %}}{{{{ crumbs([...]) }}}} (rule 134): {missing}"


# A section's tabs go in base.html's section_tabs block, above the trail, so the
# strip holds still whether or not the page has a breadcrumb (#5214). Drawn in
# the content block instead, they sit under the trail and jump down a line on
# every nested page.
_TABS_BLOCK = re.compile(r"\{%-?\s*block\s+section_tabs\s*-?%\}(.*?)\{%-?\s*endblock", re.S)
_TABS_CALL = re.compile(r"\{\{-?\s*\w*_tabs\(")


def tabs_outside_their_block(text: str) -> bool:
    calls = len(_TABS_CALL.findall(text))
    inside = sum(len(_TABS_CALL.findall(b)) for b in _TABS_BLOCK.findall(text))
    return calls > inside


def test_the_tabs_guard_can_fail():
    assert tabs_outside_their_block('{% block content %}{{ ansible_tabs("runs") }}{% endblock %}')
    assert not tabs_outside_their_block('{% block section_tabs %}{{ ansible_tabs("runs") }}{% endblock %}')


def test_section_tabs_sit_above_the_trail():
    base = (REPO / "steward/templates/base.html").read_text()
    assert base.index("{% block section_tabs %}") < base.index("{% block breadcrumb %}")
    pages = [p for p in template_files() if _EXTENDS_BASE.search(p.read_text())]
    tabbed = [p for p in pages if _TABS_CALL.search(p.read_text())]
    assert len(tabbed) >= 18, [str(p) for p in tabbed]  # the ten Ansible pages and eight Settings pages
    wrong = sorted(str(p.relative_to(REPO)) for p in tabbed if tabs_outside_their_block(p.read_text()))
    assert not wrong, f"move the tabs into {{% block section_tabs %}}: {wrong}"


# A tab strip pulled in with {% include %} lands wherever the include sits, which
# is how Settings drew its tabs under the trail unnoticed (#5377). Tabs come only
# from a *_tabs() macro call, which the guard above places.
_TABS_INCLUDE = re.compile(r"\{%-?\s*include\s+[\"'][^\"']*_tabs\.html")


def test_the_include_guard_can_fail():
    assert _TABS_INCLUDE.search('{% include "settings/_tabs.html" %}')
    assert not _TABS_INCLUDE.search('{% from "settings/_tabs.html" import settings_tabs %}')


def test_no_page_includes_a_tab_strip():
    included = sorted(str(p.relative_to(REPO)) for p in template_files() if _TABS_INCLUDE.search(p.read_text()))
    assert not included, f"call the section's *_tabs() macro in {{% block section_tabs %}}: {included}"