# -*- coding: utf-8 -*-
"""
Progress-Dialog (Modal) fuer die TUI.

Zeigt einen Fortschrittsbalken mit Cancel-Button waehrend
lang laufender Aktionen (z.B. TTS-Generierung).
"""

from __future__ import annotations

from textual.screen import ModalScreen
from textual.containers import Vertical
from textual.widgets import Static, Button, ProgressBar
from textual.app import ComposeResult


class ProgressDialog(ModalScreen[bool]):
    """
    Modaler Progress-Dialog.

    Zeigt Titel, Statustext, Fortschrittsbalken und Cancel-Button.
    Gibt True zurueck wenn erfolgreich abgeschlossen, False bei Cancel.
    """

    DEFAULT_CSS = """
    ProgressDialog {
        align: center middle;
    }

    ProgressDialog > Vertical {
        width: 64;
        height: auto;
        max-height: 14;
        border: thick $accent;
        background: $surface;
        padding: 1 2;
    }

    ProgressDialog > Vertical > #progress-title {
        text-style: bold;
        margin-bottom: 1;
    }

    ProgressDialog > Vertical > #progress-status {
        margin-bottom: 1;
    }

    ProgressDialog > Vertical > ProgressBar {
        margin-bottom: 1;
    }

    ProgressDialog > Vertical > #progress-cancel {
        width: 100%;
    }
    """

    def __init__(self, title: str = "Generierung", **kwargs) -> None:
        super().__init__(**kwargs)
        self._title = title
        self._cancelled = False

    @property
    def cancelled(self) -> bool:
        """Ob der Benutzer abgebrochen hat."""
        return self._cancelled

    def compose(self) -> ComposeResult:
        with Vertical():
            yield Static(self._title, id="progress-title")
            yield Static("[yellow]Wird vorbereitet...[/yellow]", id="progress-status")
            yield ProgressBar(total=100, show_eta=False, id="progress-bar")
            yield Button("Abbrechen", variant="warning", id="progress-cancel")

    def update_progress(self, current: int, total: int, message: str = "") -> None:
        """Aktualisiert Fortschritt und Status-Text."""
        try:
            bar = self.query_one("#progress-bar", ProgressBar)
            bar.update(total=total, progress=current)
        except Exception:
            pass

        if message:
            try:
                status = self.query_one("#progress-status", Static)
                pct = int(current / max(total, 1) * 100)
                status.update(f"[yellow]{message} ({pct}%)[/yellow]")
            except Exception:
                pass

    def finish(self, message: str = "Fertig!") -> None:
        """Zeigt Abschluss-Nachricht und schliesst nach kurzer Pause."""
        try:
            status = self.query_one("#progress-status", Static)
            status.update(f"[green]{message}[/green]")
            bar = self.query_one("#progress-bar", ProgressBar)
            bar.update(total=100, progress=100)
            btn = self.query_one("#progress-cancel", Button)
            btn.label = "Schliessen"
            btn.variant = "primary"
        except Exception:
            pass

    def show_error(self, message: str) -> None:
        """Zeigt Fehlermeldung."""
        try:
            status = self.query_one("#progress-status", Static)
            status.update(f"[red]{message}[/red]")
            btn = self.query_one("#progress-cancel", Button)
            btn.label = "Schliessen"
            btn.variant = "error"
        except Exception:
            pass

    def on_button_pressed(self, event: Button.Pressed) -> None:
        """Cancel/Schliessen Button."""
        if event.button.id == "progress-cancel":
            self._cancelled = True
            self.dismiss(False)