from __future__ import annotations

from PySide6.QtCore import Qt
from PySide6.QtGui import QColor
from PySide6.QtWidgets import (
    QFrame,
    QGraphicsDropShadowEffect,
    QHBoxLayout,
    QLabel,
    QPushButton,
    QVBoxLayout,
    QWidget,
)

from ..ui.icons import ICON_COLOR_PRIMARY, get_icon_color, icon
from .dialogs.commands_dialog import CommandsDialog
from .dialogs.settings_dialog import SettingsDialog


class StartTab(QWidget):
    def __init__(self, on_new_connection) -> None:
        super().__init__()
        self._open_dialog_windows: dict[str, QWidget] = {}
        layout = QVBoxLayout(self)
        layout.setContentsMargins(26, 26, 26, 26)
        layout.addStretch(1)

        hero_card = QFrame()
        hero_card.setObjectName("HeroCard")
        hero_card.setMaximumWidth(560)

        shadow = QGraphicsDropShadowEffect(self)
        shadow.setBlurRadius(28)
        shadow.setOffset(0, 8)
        shadow.setColor(QColor(20, 30, 50, 45))
        hero_card.setGraphicsEffect(shadow)

        hero_layout = QVBoxLayout(hero_card)
        hero_layout.setContentsMargins(28, 28, 28, 28)
        hero_layout.setSpacing(14)

        badge = QLabel("Plate Config")
        badge.setObjectName("HeroBadge")
        badge.setAlignment(Qt.AlignmentFlag.AlignCenter)
        hero_layout.addWidget(badge, alignment=Qt.AlignmentFlag.AlignHCenter)

        title = QLabel("Подключение к COM-плате")
        title.setObjectName("HeroTitle")
        title.setAlignment(Qt.AlignmentFlag.AlignCenter)
        hero_layout.addWidget(title)

        hint = QLabel("Откройте новое соединение и настройте параметры порта для работы с платой.")
        hint.setObjectName("HeroHint")
        hint.setAlignment(Qt.AlignmentFlag.AlignCenter)
        hint.setWordWrap(True)
        hero_layout.addWidget(hint)

        btn = QPushButton("Новое соединение")
        btn.setProperty("role", "primary")
        btn.setMinimumWidth(210)
        btn.setMinimumHeight(40)
        btn.setIcon(icon("fa5s.plus-circle", color=ICON_COLOR_PRIMARY))
        btn.clicked.connect(on_new_connection)
        hero_layout.addWidget(btn, alignment=Qt.AlignmentFlag.AlignHCenter)

        card_wrap = QHBoxLayout()
        card_wrap.addStretch(1)
        card_wrap.addWidget(hero_card)
        card_wrap.addStretch(1)
        layout.addLayout(card_wrap)

        # ── Кнопки «Команды платы» и «Настройки» ───────────────────
        bottom_row = QHBoxLayout()
        bottom_row.setSpacing(12)
        bottom_row.addStretch(1)

        self._commands_btn = QPushButton("Команды платы")
        self._commands_btn.setMinimumHeight(38)
        self._commands_btn.setMinimumWidth(180)
        self._commands_btn.setIcon(icon("fa5s.book", color=get_icon_color()))
        self._commands_btn.clicked.connect(self._open_commands)
        bottom_row.addWidget(self._commands_btn)

        self._settings_btn = QPushButton("Настройки приложения")
        self._settings_btn.setMinimumHeight(38)
        self._settings_btn.setMinimumWidth(180)
        self._settings_btn.setIcon(icon("fa5s.cog", color=get_icon_color()))
        self._settings_btn.clicked.connect(self._open_settings)
        bottom_row.addWidget(self._settings_btn)

        bottom_row.addStretch(1)
        layout.addLayout(bottom_row)

        layout.addStretch(2)

    # ── Public ────────────────────────────────────────────────────

    def refresh_icons(self) -> None:
        """Re-create icons with the current theme colour."""
        clr = get_icon_color()
        self._commands_btn.setIcon(icon("fa5s.book", color=clr))
        self._settings_btn.setIcon(icon("fa5s.cog", color=clr))

    # ── Handlers ──────────────────────────────────────────────────

    def _on_dialog_destroyed(self, key: str) -> None:
        self._open_dialog_windows.pop(key, None)

    def _open_single_dialog(self, key: str, factory) -> None:
        existing = self._open_dialog_windows.get(key)
        if existing is not None:
            try:
                existing.show()
                existing.raise_()
                existing.activateWindow()
                return
            except RuntimeError:
                self._open_dialog_windows.pop(key, None)

        dlg = factory()
        dlg.setModal(False)
        dlg.setWindowModality(Qt.WindowModality.NonModal)
        dlg.setAttribute(Qt.WidgetAttribute.WA_DeleteOnClose, True)
        dlg.destroyed.connect(lambda _obj=None, k=key: self._on_dialog_destroyed(k))
        self._open_dialog_windows[key] = dlg
        dlg.show()
        dlg.raise_()
        dlg.activateWindow()

    def _open_commands(self) -> None:
        self._open_single_dialog("commands", lambda: CommandsDialog(self))

    def _open_settings(self) -> None:
        self._open_single_dialog("settings", lambda: SettingsDialog(self))