import pytest
from unittest.mock import Mock
from pathlib import Path
from src.gui_2 import App
from src.models import FileItem

def test_preview_button_syncs_context_files_to_controller():
 app = Mock(spec=App)
 app.context_files = [FileItem(path='test.py', view_mode='summary')]
 app.files = []
 app.controller = Mock()
 app.controller.context_files = []
 app.controller._do_generate.return_value = ('# Test Content', Path('.'), [], '', '')
 app.show_windows = {'Context Preview': False}
 app.ui_selected_context_files = set()

 from src.gui_2 import render_context_batch_actions
 import unittest.mock as mock
 with mock.patch('src.gui_2.imgui') as mock_imgui:
  mock_imgui.button.return_value = True
  mock_imgui.same_line = mock.Mock()
  mock_imgui.text = mock.Mock()
  mock_imgui.open_popup = mock.Mock()
  render_context_batch_actions(app, 100, 50)
  assert len(app.controller.context_files) == 1
  assert app.controller.context_files[0].path == 'test.py'

def test_preview_button_empty_state_message():
 app = Mock(spec=App)
 app.context_files = []
 app.files = []
 app.controller = Mock()
 app.controller.context_files = []
 app.controller._do_generate.return_value = ('', Path('.'), [], '', '')
 app.show_windows = {'Context Preview': False}
 app.context_preview_text = None
 app.ui_selected_context_files = set()

 from src.gui_2 import render_context_batch_actions
 import unittest.mock as mock
 with mock.patch('src.gui_2.imgui') as mock_imgui:
  mock_imgui.button.return_value = True
  mock_imgui.same_line = mock.Mock()
  mock_imgui.text = mock.Mock()
  mock_imgui.open_popup = mock.Mock()
  render_context_batch_actions(app, 0, 0)
  assert app.context_preview_text == '' or 'No files' in str(app.context_preview_text)


def test_preview_generates_nonempty_for_real_files(monkeypatch):
 """Integration test: Preview button should generate content when context_files has real FileItems."""
 import src.project_manager as pm
 import src.aggregate as agg
 from src.models import FileItem

 app = Mock(spec=App)
 test_file = FileItem(path='tests/test_context_composition_decoupled.py', view_mode='summary')
 app.context_files = [test_file]
 app.files = []
 app.controller = Mock()
 app.controller.context_files = []
 app.show_windows = {'Context Preview': False}
 app.ui_selected_context_files = set()

 def mock_flat_config(*args, **kwargs):
  return {'files': {}, 'project': {}, 'output': {'output_dir': 'tests/artifacts'}, 'discussion': {'history': []}}

 def mock_aggregate_run(flat, **kwargs):
  paths = flat['files']['paths']
  assert len(paths) == 1
  assert paths[0].path == 'tests/test_context_composition_decoupled.py'
  return ('Generated Markdown Content', Path('tests/artifacts/output.md'), [])

 app.controller._do_generate.return_value = ('Generated Markdown Content', Path('tests/artifacts/output.md'), [], '', '')
 monkeypatch.setattr(pm, 'flat_config', mock_flat_config)
 monkeypatch.setattr(pm, 'save_project', lambda *args: None)
 monkeypatch.setattr(agg, 'run', mock_aggregate_run)
 monkeypatch.setattr(agg, 'build_markdown_no_history', lambda *args, **kwargs: 'stable')
 monkeypatch.setattr(agg, 'build_discussion_text', lambda *args, **kwargs: 'disc')

 from src.gui_2 import render_context_batch_actions
 import unittest.mock as mock
 with mock.patch('src.gui_2.imgui') as mock_imgui:
  mock_imgui.button.return_value = True
  mock_imgui.same_line = mock.Mock()
  mock_imgui.text = mock.Mock()
  mock_imgui.open_popup = mock.Mock()
  render_context_batch_actions(app, 100, 50)
  assert app.context_preview_text == 'Generated Markdown Content'
  assert app.controller.context_files == app.context_files

def test_text_viewer_window_invoked_in_render_loop():
 import src.gui_2 as gui_2
 assert hasattr(gui_2, 'render_text_viewer_window'), "render_text_viewer_window function must exist"
 assert callable(gui_2.render_text_viewer_window), "render_text_viewer_window must be callable"
 import re
 with open('src/gui_2.py', 'r', encoding='utf-8', newline='') as f:
     content = f.read()
 call_pattern = r'render_text_viewer_window\(app\)'
 matches = list(re.finditer(call_pattern, content))
 assert len(matches) >= 1, f"render_text_viewer_window should be called at least once in the main render loop, found {len(matches)}"

if __name__ == '__main__':
 pytest.main([__file__, '-v'])