"""Tests for gateway/hooks.py — event hook system."""

from unittest.mock import patch

import pytest

from gateway.hooks import HookRegistry


def _create_hook(hooks_dir, hook_name, events, handler_code):
    """Helper to create a hook directory with HOOK.yaml and handler.py."""
    hook_dir = hooks_dir / hook_name
    hook_dir.mkdir(parents=True)
    (hook_dir / "HOOK.yaml").write_text(
        f"name: {hook_name}\n"
        f"description: Test hook\n"
        f"events: {events}\n"
    )
    (hook_dir / "handler.py").write_text(handler_code)
    return hook_dir


class TestHookRegistryInit:
    def test_empty_registry(self):
        reg = HookRegistry()
        assert reg.loaded_hooks == []
        assert reg._handlers == {}


def _patch_no_builtins(reg):
    """Suppress built-in hook registration so tests only exercise user-hook discovery."""
    return patch.object(reg, "_register_builtin_hooks")


class TestDiscoverAndLoad:
    def test_loads_valid_hook(self, tmp_path):
        _create_hook(tmp_path, "my-hook", '["agent:start"]',
                      "def handle(event_type, context):\n    pass\n")

        reg = HookRegistry()
        with patch("gateway.hooks.HOOKS_DIR", tmp_path), _patch_no_builtins(reg):
            reg.discover_and_load()

        assert len(reg.loaded_hooks) == 1
        assert reg.loaded_hooks[0]["name"] == "my-hook"
        assert "agent:start" in reg.loaded_hooks[0]["events"]


    def test_skips_no_events(self, tmp_path):
        hook_dir = tmp_path / "empty-hook"
        hook_dir.mkdir()
        (hook_dir / "HOOK.yaml").write_text("name: empty\nevents: []\n")
        (hook_dir / "handler.py").write_text("def handle(e, c): pass\n")

        reg = HookRegistry()
        with patch("gateway.hooks.HOOKS_DIR", tmp_path), _patch_no_builtins(reg):
            reg.discover_and_load()

        assert len(reg.loaded_hooks) == 0


class TestEmit:

    @pytest.mark.asyncio
    async def test_emit_calls_async_handler(self, tmp_path):
        results = []

        hook_dir = tmp_path / "async-hook"
        hook_dir.mkdir()
        (hook_dir / "HOOK.yaml").write_text(
            "name: async-hook\nevents: ['agent:end']\n"
        )
        (hook_dir / "handler.py").write_text(
            "import asyncio\n"
            "results = []\n"
            "async def handle(event_type, context):\n"
            "    results.append(event_type)\n"
        )

        reg = HookRegistry()
        with patch("gateway.hooks.HOOKS_DIR", tmp_path):
            reg.discover_and_load()

        handler_fn = reg._handlers["agent:end"][0]
        handler_fn.__globals__["results"] = results

        await reg.emit("agent:end", {})
        assert "agent:end" in results

    @pytest.mark.asyncio
    async def test_wildcard_matching(self, tmp_path):
        results = []

        _create_hook(tmp_path, "wildcard-hook", '["command:*"]',
                      "results = []\n"
                      "def handle(event_type, context):\n"
                      "    results.append(event_type)\n")

        reg = HookRegistry()
        with patch("gateway.hooks.HOOKS_DIR", tmp_path):
            reg.discover_and_load()

        handler_fn = reg._handlers["command:*"][0]
        handler_fn.__globals__["results"] = results

        await reg.emit("command:reset", {})
        assert "command:reset" in results


class TestEmitCollect:
    """Tests for emit_collect() — returns handler return values for decision-style hooks."""

    @pytest.mark.asyncio
    async def test_collects_sync_return_values(self):
        reg = HookRegistry()
        reg._handlers["command:status"] = [
            lambda _e, _c: {"decision": "allow"},
            lambda _e, _c: {"decision": "deny", "message": "nope"},
        ]

        results = await reg.emit_collect("command:status", {})

        assert results == [
            {"decision": "allow"},
            {"decision": "deny", "message": "nope"},
        ]


    @pytest.mark.asyncio
    async def test_drops_none_return_values(self):
        reg = HookRegistry()
        reg._handlers["command:x"] = [
            lambda _e, _c: None,  # fire-and-forget, returns nothing
            lambda _e, _c: {"decision": "deny"},
            lambda _e, _c: None,
        ]

        results = await reg.emit_collect("command:x", {})

        assert results == [{"decision": "deny"}]