import pytest
from unittest.mock import MagicMock, patch
import tkinter as tk
from installer.screen import render_title, render_paragraph, TerminalConsole


@pytest.fixture
def mock_app():
    app = MagicMock()
    app.bg_canvas = MagicMock()
    app._canvas_items = []
    return app


def test_render_title(mock_app):
    render_title(mock_app, "Test Title", y=50)
    mock_app.bg_canvas.create_text.assert_called_once()
    args, kwargs = mock_app.bg_canvas.create_text.call_args
    assert args == (48, 50)
    assert kwargs["text"] == "Test Title"
    assert len(mock_app._canvas_items) == 1


def test_render_paragraph(mock_app):
    render_paragraph(mock_app, "Test Paragraph", y=100)
    mock_app.bg_canvas.create_text.assert_called_once()
    args, kwargs = mock_app.bg_canvas.create_text.call_args
    assert args == (48, 100)
    assert kwargs["text"] == "Test Paragraph"
    assert len(mock_app._canvas_items) == 1


def test_render_title_no_canvas():
    app = MagicMock()
    app.bg_canvas = None
    render_title(app, "Title")
    # Should not raise exception


@patch("platform.system", return_value="Darwin")
def test_terminal_console(mock_platform):
    import sys
    from unittest.mock import MagicMock as _MM

    # TerminalConsole requires a real tkinter root; skip when tkinter is mocked.
    if isinstance(sys.modules.get("tkinter"), _MM):
        pytest.skip("tkinter is mocked in this test run; TerminalConsole needs real tkinter")

    root = tk.Tk()
    try:
        console = TerminalConsole(root)
        console.write("Hello\n")
        # In mock or headless env, we might not be able to check text content easily
        # but we can verify it doesn't crash and state is managed
        assert console.text.cget("state") == "disabled"

        console.clear()
        assert console.text.cget("state") == "disabled"
    finally:
        root.destroy()