"""Реестр модулей: состав, конфликты имён, границы импортов ядра."""
import ast
from pathlib import Path

import pytest

from jira_hub.core import registry
from jira_hub.core.modules import CommandHooks, Module

CORE = Path(__file__).resolve().parent.parent / "src" / "jira_hub" / "core"

# временно: R-1, сокращается в Task 4–6
PENDING = {"api.py", "cli.py", "mcp_server.py"}


def _noop(*a, **k):
    return None


def _hooks(types):
    names = [f for f in CommandHooks.__dataclass_fields__ if f not in ("types", "read_types")]
    return CommandHooks(types=frozenset(types), read_types=frozenset(), **{n: _noop for n in names})


def test_jira_registered():
    assert [m.name for m in registry.modules()] == ["jira"]
    assert registry.module("jira").name == "jira"
    assert registry.module("nope") is None


def test_command_type_conflict():
    a = Module(name="jira", commands=_hooks({"refresh"}))
    b = Module(name="x", commands=_hooks({"refresh"}))
    with pytest.raises(RuntimeError) as e:
        registry.check([a, b], [], {})
    assert "refresh" in str(e.value) and "jira" in str(e.value) and "x" in str(e.value)


def test_settings_conflict():
    with pytest.raises(RuntimeError, match="port"):
        registry.check([Module(name="x", settings_defaults={"port": 1})], [], {"port": 8790})


def test_route_conflict():
    core = [("GET", r"^/projects$", _noop, "client")]
    m = Module(name="x", routes=(("GET", r"^/projects$", _noop, "client"),))
    with pytest.raises(RuntimeError, match="/projects"):
        registry.check([m], core, {})


def test_module_of(monkeypatch):
    a = Module(name="a", commands=_hooks({"t1"}))
    monkeypatch.setattr(registry, "_cache", [a])
    assert registry.module_of("t1") is a and registry.module_of("t2") is None


def _module_imports(tree, top_level_only):
    """Импорты пакета jira_hub.modules (абсолютные и относительные из core/)."""
    found = []
    for n in (tree.body if top_level_only else ast.walk(tree)):
        if isinstance(n, ast.Import):
            names = [a.name for a in n.names]
        elif isinstance(n, ast.ImportFrom):
            prefix = {0: "", 1: "jira_hub.core.", 2: "jira_hub."}[n.level]
            base = (prefix + (n.module or "")).rstrip(".")
            names = [base] + [base + "." + a.name for a in n.names]
        else:
            continue
        if any(x == "jira_hub.modules" or x.startswith("jira_hub.modules.") for x in names):
            found.append(n)
    return found


def test_core_imports():
    dirty = set()
    for path in sorted(CORE.glob("*.py")):
        tree = ast.parse(path.read_text(encoding="utf-8"))
        if path.name in ("registry.py", "db.py"):
            # только внутри функций: на верхнем уровне модуля импортов модулей нет
            assert not _module_imports(tree, top_level_only=True), path.name
            continue
        if _module_imports(tree, top_level_only=False):
            dirty.add(path.name)
    assert dirty - PENDING == set(), f"ядро импортирует модули: {sorted(dirty - PENDING)}"
    assert PENDING - dirty == set(), f"PENDING устарел, уберите: {sorted(PENDING - dirty)}"