from typing import List, Optional

from textual.app import ComposeResult
from textual.containers import Horizontal, Vertical
from textual.screen import ModalScreen
from textual.widgets import Button, Label


class OverwriteConfirmScreen(ModalScreen[bool]):
    """Dialog confirming an overwrite of protected (hard-to-regenerate) outputs."""

    def __init__(self, directory: str, conflicts: Optional[List[str]] = None):
        super().__init__()
        self.directory = directory
        # Human-readable descriptions of the protected artifacts at risk. When
        # empty, falls back to a generic non-empty-directory warning.
        self.conflicts = conflicts or []

    def compose(self) -> ComposeResult:
        if self.conflicts:
            items = "\n".join(f"  • {c}" for c in self.conflicts)
            body = (
                f"This scenario will overwrite existing, hard-to-regenerate "
                f"outputs in:\n[dim]{self.directory}[/dim]\n\n{items}\n\nProceed?"
            )
        else:
            body = (
                f"The output directory is not empty:\n[dim]{self.directory}[/dim]"
                "\n\nProceeding will likely overwrite existing experiment data."
            )

        with Vertical(id="dialog"):
            yield Label("[bold red]WARNING[/bold red]")
            yield Label(body, id="warning_label")
            with Horizontal(id="dialog_buttons"):
                yield Button("Cancel", variant="primary", id="btn_cancel")
                yield Button("Overwrite", variant="error", id="btn_proceed")

    def on_button_pressed(self, event: Button.Pressed) -> None:
        if event.button.id == "btn_proceed":
            self.dismiss(True)
        else:
            self.dismiss(False)