"""Tests for plugin discovery and loading."""
import json
from pathlib import Path

import pytest

from pyra.plugins.loader import load_plugin_by_name, load_plugins


def _make_plugin(plugins_dir: Path, name: str, plugin_code: str, manifest: dict | None = None) -> Path:
    """Helper: create a minimal plugin directory."""
    plugin_dir = plugins_dir / name
    plugin_dir.mkdir(parents=True)
    if manifest is None:
        manifest = {"name": name, "version": "0.1.0", "description": "Test plugin"}
    (plugin_dir / "manifest.json").write_text(json.dumps(manifest))
    (plugin_dir / "plugin.py").write_text(plugin_code)
    return plugin_dir


_MINIMAL_PLUGIN = """\
from pyra.plugins.base import BasePlugin

class _Plugin(BasePlugin):
    name = "test_plugin"
    description = "A test plugin"
    version = "0.1.0"

def get_plugin():
    return _Plugin()
"""

_TOOL_PLUGIN = """\
from pyra.plugins.base import BasePlugin, Tool

class _Plugin(BasePlugin):
    name = "tool_plugin"
    description = "Plugin with a tool"
    version = "0.1.0"

    def tools(self):
        return [
            Tool(
                name="say_hello",
                description="Says hello",
                parameters={"type": "object", "properties": {}},
                handler=lambda: "hello",
                requires_approval=False,
            )
        ]

def get_plugin():
    return _Plugin()
"""


def test_load_valid_plugin(tmp_pyra_home, tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    _make_plugin(plugins_dir, "test_plugin", _MINIMAL_PLUGIN)
    plugin = load_plugin_by_name("test_plugin", plugins_dir)
    assert plugin is not None
    assert plugin.name == "test_plugin"


def test_load_plugins_discovers_all(tmp_pyra_home, tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    _make_plugin(plugins_dir, "plugin_a", _MINIMAL_PLUGIN.replace("test_plugin", "plugin_a"))
    _make_plugin(plugins_dir, "plugin_b", _MINIMAL_PLUGIN.replace("test_plugin", "plugin_b"))
    plugins = load_plugins(plugins_dir)
    names = {p.name for p in plugins}
    assert "plugin_a" in names
    assert "plugin_b" in names


def test_load_plugins_empty_dir(tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    assert load_plugins(plugins_dir) == []


def test_load_plugins_missing_dir(tmp_path):
    assert load_plugins(tmp_path / "nonexistent") == []


def test_missing_manifest_returns_none(tmp_pyra_home, tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    plugin_dir = plugins_dir / "bad_plugin"
    plugin_dir.mkdir()
    (plugin_dir / "plugin.py").write_text(_MINIMAL_PLUGIN)
    # No manifest.json
    result = load_plugin_by_name("bad_plugin", plugins_dir)
    assert result is None


def test_missing_plugin_py_returns_none(tmp_pyra_home, tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    plugin_dir = plugins_dir / "bad_plugin"
    plugin_dir.mkdir()
    (plugin_dir / "manifest.json").write_text(json.dumps({"name": "bad_plugin", "version": "1.0.0"}))
    # No plugin.py
    result = load_plugin_by_name("bad_plugin", plugins_dir)
    assert result is None


def test_invalid_manifest_returns_none(tmp_pyra_home, tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    plugin_dir = plugins_dir / "bad_plugin"
    plugin_dir.mkdir()
    (plugin_dir / "manifest.json").write_text('{"name": "bad_plugin"}')  # missing version
    (plugin_dir / "plugin.py").write_text(_MINIMAL_PLUGIN)
    result = load_plugin_by_name("bad_plugin", plugins_dir)
    assert result is None


def test_no_get_plugin_returns_none(tmp_pyra_home, tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    code = "# No get_plugin function here\nclass Foo: pass"
    _make_plugin(plugins_dir, "no_factory", code)
    result = load_plugin_by_name("no_factory", plugins_dir)
    assert result is None


def test_plugin_with_syntax_error_returns_none(tmp_pyra_home, tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    _make_plugin(plugins_dir, "broken", "def get_plugin(: INVALID SYNTAX")
    result = load_plugin_by_name("broken", plugins_dir)
    assert result is None


def test_one_bad_plugin_does_not_prevent_others(tmp_pyra_home, tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    _make_plugin(plugins_dir, "good", _MINIMAL_PLUGIN.replace("test_plugin", "good"))
    _make_plugin(plugins_dir, "bad", "SYNTAX ERROR !!!")
    plugins = load_plugins(plugins_dir)
    names = [p.name for p in plugins]
    assert "good" in names
    assert len(names) == 1


def test_plugin_errors_logged(tmp_pyra_home, tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    _make_plugin(plugins_dir, "bad", "SYNTAX ERROR")
    load_plugin_by_name("bad", plugins_dir)
    log_file = tmp_pyra_home / "logs" / "plugin_errors.log"
    assert log_file.exists()
    assert "bad" in log_file.read_text()


def test_plugin_tools_accessible(tmp_pyra_home, tmp_path):
    plugins_dir = tmp_path / "plugins"
    plugins_dir.mkdir()
    _make_plugin(plugins_dir, "tool_plugin", _TOOL_PLUGIN)
    plugin = load_plugin_by_name("tool_plugin", plugins_dir)
    assert plugin is not None
    tools = plugin.tools()
    assert len(tools) == 1
    assert tools[0].name == "say_hello"