import tkinter as tk
from tkinter import ttk

class ThemeManager:
    """Manager for application theme configuration (defaulting to light theme)."""
    
    def __init__(self, root):
        """
        Initialize the theme manager and apply the light theme.

        Args:
            root: The Tkinter root window (needed for background config).
        """
        self.root = root
        self.style = ttk.Style()
        self.apply_theme() # Directly apply light theme

    def apply_theme(self):
        """Applies the light theme."""
        self._apply_light_theme()
        # Ensure the root window background matches the theme
        try:
            bg_color = self.style.lookup('.', 'background')
            self.root.configure(background=bg_color)
        except tk.TclError:
            # Fallback if style lookup fails
            self.root.configure(background='SystemButtonFace')

    def _apply_light_theme(self):
        """Configure a standard light theme using system defaults where possible."""
        try:
            # Use a standard theme, preferring OS native look
            available_themes = self.style.theme_names()
            # Windows preference order
            preferred_themes = ['vista', 'xpnative', 'clam', 'alt', 'default'] 
            chosen_theme = 'default'
            for theme in preferred_themes:
                if theme in available_themes:
                    try:
                        self.style.theme_use(theme)
                        chosen_theme = theme
                        # print(f"Using theme: {chosen_theme}") # Debug
                        break
                    except tk.TclError:
                        continue
            
            # Reset most styles to theme defaults by configuring with empty strings
            # or removing specific configure calls if they were only for dark theme.
            # Explicitly set base theme colors for light mode
            self.style.configure('.', background='SystemButtonFace', foreground='SystemWindowText')
            self.style.configure('TFrame', background='SystemButtonFace')
            # Explicitly set foreground AND background for visibility
            self.style.configure('TLabel', foreground='SystemWindowText', background='SystemButtonFace')
            # Explicitly set foreground AND background for visibility
            self.style.configure('TButton', foreground='SystemWindowText', background='SystemButtonFace', padding=5)
            # Reset button border color explicitly if needed, or remove if SystemButtonFace is desired
            self.style.configure('TButton', bordercolor='SystemGrayText') # Example: Use a visible border
            self.style.map('TButton', 
                           background=[('active', 'SystemButtonHighlight'), ('pressed', '!focus', 'SystemButtonFace'), ('focus', 'SystemButtonHighlight')]) # Example map
            # Keep Danger button distinct
            self.style.configure('Danger.TButton', foreground='black', background='#cc3333', bordercolor='#aa2222', padding=5) # Enhanced danger button
            self.style.map('Danger.TButton', 
                          background=[('active', '#dd4444'), ('pressed', '#bb2222')],
                          foreground=[('active', 'black'), ('pressed', 'black')])
            
            # TEntry: Use defaults. Let's ensure its colors are sensible too.
            self.style.configure('TEntry', foreground='SystemWindowText', fieldbackground='SystemWindow', insertcolor='SystemWindowText', bordercolor='SystemGrayText')
            # self.style.map('TEntry') # Reset map - might not be needed if configure is explicit
            
            self.style.configure('TLabelframe', background='SystemButtonFace', bordercolor='SystemGrayText')
            # Ensure label frame labels are also visible
            self.style.configure('TLabelframe.Label', background='SystemButtonFace', foreground='SystemWindowText')
            
            # TNotebook adjustments (if needed, often inherit well)
            self.style.configure('TNotebook', background='SystemButtonFace', bordercolor='SystemGrayText', tabmargins=[2, 5, 2, 0])
            self.style.configure('TNotebook.Tab', foreground='SystemWindowText', background='SystemButtonFace', padding=[10, 5])
            self.style.map('TNotebook.Tab', background=[('selected', 'SystemButtonHighlight')]) # Example map
            
            # Progressbar and Scrollbar adjustments
            self.style.configure('Horizontal.TProgressbar', background='SystemHighlight', troughcolor='SystemButtonFace', bordercolor='SystemGrayText')
            self.style.configure('TScrollbar', troughcolor='SystemButtonFace', background='SystemScrollbar', bordercolor='SystemGrayText', arrowcolor='SystemWindowText')
            # self.style.map('TScrollbar') # Reset map

        except Exception as e:
            print(f"Error applying light theme: {e}")

    def get_scrolledtext_colors(self):
        """Returns appropriate background/foreground colors for ScrolledText (light theme defaults)."""
        # Always return light theme defaults now
        try:
            default_bg = self.root.option_get('background', 'Text')
            default_fg = self.root.option_get('foreground', 'Text')
            insert_bg = self.root.option_get('insertBackground', 'Text') 
            if not default_bg: default_bg = 'SystemWindow' # Tk default color name
            if not default_fg: default_fg = 'SystemWindowText'
            if not insert_bg: insert_bg = default_fg # Cursor color often matches text
            return {'bg': default_bg, 'fg': default_fg, 'insertbackground': insert_bg}
        except tk.TclError:
             # Fallback if options can't be retrieved
            return {'bg': 'white', 'fg': 'black', 'insertbackground': 'black'}