from rich.markdown import Markdown

from textual import events
from textual.app import App
from textual.views import DockView
from textual.widgets import Header, Footer, Placeholder, ScrollView


class MyApp(App):
    """An example of a very simple Textual App"""

    async def on_load(self, event: events.Load) -> None:
        await self.bind("q,ctrl+c", "quit", "Quit")
        await self.bind("b", "view.toggle('sidebar')", "Toggle sidebar")

    async def on_startup(self, event: events.Startup) -> None:

        view = await self.push_view(DockView())

        footer = Footer()
        header = Header()
        body = ScrollView()
        sidebar = Placeholder()

        footer.add_key("b", "Toggle sidebar")
        footer.add_key("q", "Quit")

        await view.dock(header, edge="top")
        await view.dock(footer, edge="bottom")
        await view.dock(sidebar, edge="left", size=30, name="sidebar")
        await view.dock(body, edge="right")

        async def get_markdown(filename: str) -> None:
            with open(filename, "rt") as fh:
                readme = Markdown(fh.read(), hyperlinks=True)
            await body.update(readme)

        await self.call_later(get_markdown, "richreadme.md")


MyApp.run(title="Simple App", log="textual.log")