# -*- coding: utf-8 -*-
"""
Main entry point script for the GeoElevation application.
Works for both `python -m geoelevation` and as PyInstaller entry point.
Uses absolute imports.
"""

import sys
import os
import traceback
import multiprocessing
import tkinter as tk

# --- Import the necessary modules using ABSOLUTE paths ---
try:
    # MODIFIED: Changed relative import to absolute import.
    # WHY: To make this script work consistently as a direct entry point
    #      (for PyInstaller) and when run via `python -m`. Assumes the
    #      'geoelevation' package is findable in sys.path.
    # HOW: Changed 'from .elevation_gui import ElevationApp' to
    #      'from geoelevation.elevation_gui import ElevationApp'.
    from geoelevation.elevation_gui import ElevationApp
    # Import other components if needed for setup (using absolute paths)
    # from geoelevation.config import DEFAULT_CACHE_DIR # Example if you had config

except ImportError as e:
    # Error message adjusted slightly for absolute import context
    print(f"ERROR: Could not import required modules using absolute paths (e.g., 'geoelevation.elevation_gui').")
    print(f"       Ensure the 'geoelevation' package is correctly structured and accessible.")
    print(f"ImportError: {e}")
    print(f"Current sys.path: {sys.path}")
    # Try to determine expected base path for context
    try:
        script_path = os.path.dirname(os.path.abspath(__file__))
        parent_path = os.path.dirname(script_path)
        print(f"       Expected package 'geoelevation' potentially under: {parent_path}")
    except NameError:
        pass # __file__ might not be defined in some rare cases
    traceback.print_exc()
    sys.exit(1)
except Exception as e:
    print(f"ERROR: An unexpected error occurred during initial imports: {e}")
    traceback.print_exc()
    sys.exit(1)


def main():
    """
    Initializes and runs the ElevationApp GUI application.
    """
    root_window = tk.Tk()
    try:
        # Instantiate ElevationApp, passing the root window
        app = ElevationApp(parent_widget=root_window)
        # Start the Tkinter event loop
        root_window.mainloop()
    except Exception as e:
        print(f"FATAL ERROR: An unexpected error occurred during application execution: {e}")
        traceback.print_exc()
        try:
            error_root = tk.Tk()
            error_root.withdraw()
            from tkinter import messagebox
            messagebox.showerror(
                "Fatal Error",
                f"Application failed to run:\n{e}\n\nSee console for details.",
                parent=error_root
            )
            error_root.destroy()
        except Exception:
            pass
        sys.exit(1)

# --- Main Execution Guard ---
if __name__ == "__main__":
    # !!! IMPORTANT for PyInstaller and multiprocessing !!!
    # Must be called in the main entry script for frozen executables.
    multiprocessing.freeze_support()

    # print(f"Running GeoElevation via __main__.py...")
    main()