"""无业务状态的可复用 Qt 控件。"""

from PyQt5.QtCore import Qt, QRectF, pyqtSignal
from PyQt5.QtGui import QColor, QPainter
from PyQt5.QtWidgets import QCheckBox, QLabel, QFrame, QHBoxLayout

try:
    from PyQt5.QtWidgets import QGraphicsDropShadowEffect
except ImportError:  # 轻量测试桩不提供图形效果类，真实 PyQt5 仍使用阴影。
    class QGraphicsDropShadowEffect:  # type: ignore[no-redef]
        def __init__(self, *_args, **_kwargs):
            pass

        def setBlurRadius(self, *_args):
            pass

        def setOffset(self, *_args):
            pass

        def setColor(self, *_args):
            pass

from .theme import C_BORDER, C_GREEN, C_RED, C_TITLE


_NL_BASE = f"color: {C_TITLE}; font-size: 12px;"


class NodeLabel(QLabel):
    """可点击标签：hover 显示下划线和手型光标，点击发出 clicked 信号。"""

    clicked = pyqtSignal()

    def __init__(self, text="", tooltip="点击切换节点", base=None, hover=None):
        super().__init__(text)
        self._base = base or _NL_BASE
        self._hover = hover or self._base + " text-decoration: underline;"
        self.setStyleSheet(self._base)
        if tooltip:
            self.setToolTip(tooltip)

    def enterEvent(self, event):
        self.setStyleSheet(self._hover)
        self.setCursor(Qt.PointingHandCursor)
        super().enterEvent(event)

    def leaveEvent(self, event):
        self.setStyleSheet(self._base)
        self.unsetCursor()
        super().leaveEvent(event)

    def mouseReleaseEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.clicked.emit()
        super().mouseReleaseEvent(event)


class ToggleSwitch(QCheckBox):
    """苹果风格开关：绿/灰胶囊加滑动圆钮，自绘且不依赖图片资源。"""

    def __init__(self, checked=False, parent=None):
        super().__init__(parent)
        self.setChecked(checked)
        self.setFixedSize(42, 22)
        self.setCursor(Qt.PointingHandCursor)

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.setPen(Qt.NoPen)
        painter.setBrush(QColor(C_GREEN) if self.isChecked() else QColor("#c8ccd4"))
        painter.drawRoundedRect(QRectF(0, 0, 42, 22), 11, 11)
        knob_x = 20.0 if self.isChecked() else 2.0
        painter.setBrush(QColor("#ffffff"))
        painter.drawEllipse(QRectF(knob_x, 2.0, 18.0, 18.0))
        painter.end()

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.setChecked(not self.isChecked())
            self.repaint()
            event.accept()
            return
        super().mousePressEvent(event)


class StatusDot(QLabel):
    """代理状态小圆点。"""

    def __init__(self):
        super().__init__()
        self.setFixedSize(14, 14)
        self.set_off()

    def set_on(self):
        self.setStyleSheet(f"""
            QLabel {{
                background-color: {C_GREEN};
                border-radius: 7px;
                border: 1px solid rgba(81, 207, 102, 50);
            }}
        """)

    def set_off(self):
        self.setStyleSheet(f"""
            QLabel {{
                background-color: {C_RED};
                border-radius: 7px;
                border: 1px solid rgba(255, 107, 107, 50);
            }}
        """)

    def set_disabled(self):
        self.setStyleSheet(f"""
            QLabel {{
                background-color: {C_BORDER};
                border-radius: 7px;
                border: 1px solid rgba(136, 153, 170, 50);
            }}
        """)


class ProxyModeCard(QFrame):
    """整个卡片可点击；描边表示选择，圆点表示所选模式的运行状态。"""

    clicked = pyqtSignal()

    def __init__(self, title: str, parent=None):
        super().__init__(parent)
        self.setCursor(Qt.PointingHandCursor)
        self._glow = QGraphicsDropShadowEffect(self)
        self._glow.setBlurRadius(12)
        self._glow.setOffset(0, 1)
        self.setGraphicsEffect(self._glow)
        row = QHBoxLayout(self)
        row.setContentsMargins(11, 10, 11, 10)
        row.setSpacing(5)
        self.title = QLabel(title)
        self.title.setStyleSheet("font-weight: bold; background: transparent;")
        self.dot = StatusDot()
        for child in (self.title, self.dot):
            child.setAttribute(Qt.WA_TransparentForMouseEvents)
        row.addWidget(self.title)
        row.addStretch()
        row.addWidget(self.dot)
        self.set_state(False, False)

    def set_state(self, selected: bool, running: bool) -> None:
        border = C_TITLE if selected else "#cbd6e2"
        background = "#f5f7f9" if selected else "#fafcfe"
        self.setStyleSheet(
            f"QFrame {{ background-color: {background}; border: {'2px' if selected else '1px'} "
            f"solid {border}; border-radius: 8px; }}"
            "QFrame:hover { border-color: #e2e8ef; background-color: #ffffff; }"
            "QLabel { border: none; }"
        )
        self._glow.setColor(QColor(136, 153, 170, 105 if selected else 52))
        if not selected:
            self.dot.set_disabled()
        elif running:
            self.dot.set_on()
        else:
            self.dot.set_off()

    def mouseReleaseEvent(self, event):
        if event.button() == Qt.LeftButton and self.rect().contains(event.pos()):
            self.clicked.emit()
        super().mouseReleaseEvent(event)