from PySide6.QtCore import QSize
from PySide6.QtGui import QColor, QFont, QPalette
from PySide6.QtWidgets import QApplication

class ModernTheme:
    DARK_BG = "#0f0f0f"
    DARK_SURFACE = "#1a1a1a"
    DARK_ELEVATION = "#242424"
    DARK_BORDER = "#2a2a2a"
    
    ACCENT_PRIMARY = "#6366f1"
    ACCENT_SECONDARY = "#8b5cf6"
    ACCENT_HOVER = "#818cf8"
    
    TEXT_PRIMARY = "#ffffff"
    TEXT_SECONDARY = "#a1a1aa"
    TEXT_DISABLED = "#71717a"
    
    SUCCESS = "#22c55e"
    WARNING = "#f59e0b"
    ERROR = "#ef4444"
    
    GRADIENT_HEADER = "linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%)"
    
    @staticmethod
    def get_stylesheet():
        return f"""
        QMainWindow, QWidget {{
            background-color: {ModernTheme.DARK_BG};
            color: {ModernTheme.TEXT_PRIMARY};
            font-family: 'Segoe UI', 'SF Pro Display', -apple-system, sans-serif;
        }}
        
        QScrollBar:vertical {{
            background: {ModernTheme.DARK_SURFACE};
            width: 8px;
            border-radius: 4px;
        }}
        
        QScrollBar::handle:vertical {{
            background: {ModernTheme.TEXT_DISABLED};
            border-radius: 4px;
            min-height: 30px;
        }}
        
        QScrollBar::handle:vertical:hover {{
            background: {ModernTheme.TEXT_SECONDARY};
        }}
        
        QScrollBar::add-line:vertical, QScrollBar::sub-line:vertical {{
            height: 0px;
        }}
        
        QLineEdit {{
            background-color: {ModernTheme.DARK_ELEVATION};
            border: 1px solid {ModernTheme.DARK_BORDER};
            border-radius: 8px;
            padding: 10px 14px;
            color: {ModernTheme.TEXT_PRIMARY};
            font-size: 14px;
        }}
        
        QLineEdit:focus {{
            border: 1px solid {ModernTheme.ACCENT_PRIMARY};
        }}
        
        QPushButton {{
            background-color: {ModernTheme.ACCENT_PRIMARY};
            color: white;
            border: none;
            border-radius: 8px;
            padding: 10px 20px;
            font-weight: 600;
            font-size: 14px;
        }}
        
        QPushButton:hover {{
            background-color: {ModernTheme.ACCENT_HOVER};
        }}
        
        QPushButton:pressed {{
            background-color: {ModernTheme.ACCENT_PRIMARY};
        }}
        
        QPushButton#secondary {{
            background-color: {ModernTheme.DARK_ELEVATION};
            border: 1px solid {ModernTheme.DARK_BORDER};
            color: {ModernTheme.TEXT_PRIMARY};
        }}
        
        QPushButton#secondary:hover {{
            background-color: {ModernTheme.DARK_SURFACE};
            border-color: {ModernTheme.ACCENT_PRIMARY};
        }}
        
        QLabel {{
            color: {ModernTheme.TEXT_PRIMARY};
        }}
        
        QLabel#title {{
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 8px;
        }}
        
        QLabel#subtitle {{
            font-size: 14px;
            color: {ModernTheme.TEXT_SECONDARY};
        }}
        
        QListWidget {{
            background-color: {ModernTheme.DARK_SURFACE};
            border: 1px solid {ModernTheme.DARK_BORDER};
            border-radius: 12px;
            outline: none;
            padding: 8px;
        }}
        
        QListWidget::item {{
            border-radius: 8px;
            padding: 12px;
            margin: 4px;
        }}
        
        QListWidget::item:selected {{
            background-color: {ModernTheme.ACCENT_PRIMARY};
            color: white;
        }}
        
        QListWidget::item:hover {{
            background-color: {ModernTheme.DARK_ELEVATION};
        }}
        
        QFrame#card {{
            background-color: {ModernTheme.DARK_SURFACE};
            border-radius: 16px;
            border: 1px solid {ModernTheme.DARK_BORDER};
        }}
        
        QFrame#card:hover {{
            border-color: {ModernTheme.ACCENT_PRIMARY};
        }}
        """
    
    @staticmethod
    def apply_theme(app: QApplication):
        app.setStyleSheet(ModernTheme.get_stylesheet())
        
        font = QFont("Segoe UI", 10)
        if not QFont(font).exactMatch():
            font = QFont("SF Pro Display", 10)
        if not QFont(font).exactMatch():
            font = QFont("Arial", 10)
        
        app.setFont(font)