"""Tutorialbild, Ampel-Startsequenz und Reissverschluss-Effekt."""

from __future__ import annotations

import pygame

from . import config, scene
from .input_map import Action


class Intro:
    """Vorspann vor dem ersten Koffer.

    Ablauf: Tutorialbild (wartet auf Bestätigung) → drei Punkte mit Ton →
    Reissverschluss, der den Auflieger "öffnet".
    """

    def __init__(self, assets) -> None:
        self.assets = assets
        self.phase = "instruction" if assets.instruction is not None else "countdown"
        self.timer = 0.0
        self.dot_index = 0
        if self.phase == "countdown":
            self._start_countdown()

    # ------------------------------------------------------------------
    def _start_countdown(self) -> None:
        self.phase = "countdown"
        self.timer = 0.0
        self.dot_index = 0
        self.assets.play("beep1")

    def handle(self, action: Action) -> None:
        if self.phase == "instruction" and action is Action.PRIMARY:
            self._start_countdown()

    def update(self, dt: float) -> bool:
        """Weiterrechnen; Rückgabe ``True``, wenn der Vorspann fertig ist."""
        self.timer += dt
        if self.phase == "countdown":
            index = int(self.timer // config.INTRO_DOT_DELAY)
            if index >= len(config.INTRO_DOT_COLORS):
                self.phase = "zip"
                self.timer = 0.0
                self.assets.play("zip")
            elif index != self.dot_index:
                self.dot_index = index
                self.assets.play(f"beep{index + 1}")
            return False
        if self.phase == "zip":
            return self.timer >= config.INTRO_ZIP_DURATION
        return False

    # ------------------------------------------------------------------
    def draw(self, surface: pygame.Surface) -> None:
        if self.phase == "instruction":
            surface.blit(self.assets.instruction, (0, 0))
            return

        scene.draw_top_bar(surface, self.assets, 0.0)
        scene.draw_background(surface, self.assets)
        scene.draw_bottom_bar(surface, self.assets, [])

        if self.phase == "countdown":
            if 0 <= self.dot_index < len(config.INTRO_DOT_COLORS):
                pygame.draw.circle(
                    surface,
                    config.INTRO_DOT_COLORS[self.dot_index],
                    (
                        config.TRAILER_X + config.TRAILER_WIDTH // 2,
                        config.TRAILER_Y + config.TRAILER_HEIGHT // 2,
                    ),
                    config.INTRO_DOT_RADIUS,
                )
        elif self.phase == "zip":
            progress = min(1.0, self.timer / config.INTRO_ZIP_DURATION) if config.INTRO_ZIP_DURATION else 1.0
            width = int(config.TRAILER_WIDTH * progress)
            pygame.draw.rect(
                surface,
                config.COLOR_TRAILER,
                (config.TRAILER_X, config.TRAILER_Y, width, config.TRAILER_HEIGHT),
            )