# Description: Theme system for EU-Utility
# Provides dark, light, and auto theme support

"""
EU-Utility Theme System
Supports Dark, Light, and Auto (system-based) themes
"""

from PyQt6.QtWidgets import QWidget, QVBoxLayout, QHBoxLayout, QLabel, QPushButton, QComboBox
from PyQt6.QtCore import Qt, QTimer, pyqtSignal
from PyQt6.QtGui import QColor, QPalette
import json
import os


class ThemeManager:
    """Central theme management for EU-Utility."""
    
    theme_changed = pyqtSignal(str)  # Emitted when theme changes
    
    # Theme definitions
    THEMES = {
        'dark': {
            'name': 'Dark',
            'bg_primary': '#1a1a2e',
            'bg_secondary': '#16213e',
            'bg_tertiary': '#0f3460',
            'accent': '#e94560',
            'text_primary': '#ffffff',
            'text_secondary': '#b8b8b8',
            'border': '#2d2d44',
            'success': '#4caf50',
            'warning': '#ff9800',
            'error': '#f44336',
        },
        'light': {
            'name': 'Light',
            'bg_primary': '#f5f5f5',
            'bg_secondary': '#ffffff',
            'bg_tertiary': '#e0e0e0',
            'accent': '#2196f3',
            'text_primary': '#212121',
            'text_secondary': '#757575',
            'border': '#bdbdbd',
            'success': '#4caf50',
            'warning': '#ff9800',
            'error': '#f44336',
        },
        'eu_classic': {
            'name': 'EU Classic',
            'bg_primary': '#141f23',
            'bg_secondary': '#1a2a30',
            'bg_tertiary': '#0f1416',
            'accent': '#ff8c42',
            'text_primary': '#ffffff',
            'text_secondary': '#a0a0a0',
            'border': '#2a3a40',
            'success': '#4ecdc4',
            'warning': '#ff8c42',
            'error': '#e74c3c',
        }
    }
    
    _instance = None
    
    def __new__(cls):
        if cls._instance is None:
            cls._instance = super().__new__(cls)
            cls._instance._initialized = False
        return cls._instance
    
    def __init__(self):
        if self._initialized:
            return
        self._initialized = True
        self.current_theme = 'eu_classic'
        self.auto_theme = False
        self._load_settings()
    
    def _load_settings(self):
        """Load theme settings from file."""
        try:
            config_path = os.path.expanduser('~/.eu-utility/theme.json')
            if os.path.exists(config_path):
                with open(config_path, 'r') as f:
                    settings = json.load(f)
                    self.current_theme = settings.get('theme', 'eu_classic')
                    self.auto_theme = settings.get('auto', False)
        except:
            pass
    
    def _save_settings(self):
        """Save theme settings to file."""
        try:
            config_dir = os.path.expanduser('~/.eu-utility')
            os.makedirs(config_dir, exist_ok=True)
            config_path = os.path.join(config_dir, 'theme.json')
            with open(config_path, 'w') as f:
                json.dump({
                    'theme': self.current_theme,
                    'auto': self.auto_theme
                }, f)
        except:
            pass
    
    def get_theme(self, name=None):
        """Get theme colors dictionary."""
        if name is None:
            name = self.current_theme
        return self.THEMES.get(name, self.THEMES['eu_classic'])
    
    def set_theme(self, name):
        """Set active theme."""
        if name in self.THEMES:
            self.current_theme = name
            self._save_settings()
            self.theme_changed.emit(name)
    
    def get_stylesheet(self, theme_name=None):
        """Generate QSS stylesheet for theme."""
        t = self.get_theme(theme_name)
        
        return f"""
        QWidget {{
            background-color: {t['bg_primary']};
            color: {t['text_primary']};
            font-family: 'Segoe UI', sans-serif;
        }}
        
        QPushButton {{
            background-color: {t['bg_tertiary']};
            color: {t['text_primary']};
            border: 1px solid {t['border']};
            padding: 8px 16px;
            border-radius: 4px;
        }}
        
        QPushButton:hover {{
            background-color: {t['accent']};
        }}
        
        QLineEdit, QTextEdit {{
            background-color: {t['bg_secondary']};
            color: {t['text_primary']};
            border: 1px solid {t['border']};
            padding: 6px;
            border-radius: 4px;
        }}
        
        QLabel {{
            color: {t['text_primary']};
        }}
        
        QComboBox {{
            background-color: {t['bg_secondary']};
            color: {t['text_primary']};
            border: 1px solid {t['border']};
            padding: 6px;
            border-radius: 4px;
        }}
        
        QProgressBar {{
            background-color: {t['bg_secondary']};
            border: 1px solid {t['border']};
            border-radius: 4px;
        }}
        
        QProgressBar::chunk {{
            background-color: {t['accent']};
            border-radius: 4px;
        }}
        
        QScrollBar:vertical {{
            background-color: {t['bg_secondary']};
            width: 12px;
            border-radius: 6px;
        }}
        
        QScrollBar::handle:vertical {{
            background-color: {t['border']};
            border-radius: 6px;
        }}
        """


# Global instance
theme_manager = ThemeManager()