"""
Alternative PDF printing using GhostScript for superior quality.
GhostScript maintains vector quality better than SumatraPDF.
"""

import subprocess
import os
import sys

def find_ghostscript():
    """
    Find GhostScript installation on Windows.
    
    Returns:
        str: Path to gswin64c.exe or gswin32c.exe, or None if not found
    """
    possible_paths = [
        r"C:\Program Files\gs\gs10.04.0\bin\gswin64c.exe",
        r"C:\Program Files\gs\gs10.03.1\bin\gswin64c.exe",
        r"C:\Program Files\gs\gs10.03.0\bin\gswin64c.exe",
        r"C:\Program Files\gs\gs10.02.1\bin\gswin64c.exe",
        r"C:\Program Files\gs\gs10.02.0\bin\gswin64c.exe",
        r"C:\Program Files\gs\gs10.01.2\bin\gswin64c.exe",
        r"C:\Program Files\gs\gs10.01.1\bin\gswin64c.exe",
        r"C:\Program Files\gs\gs10.01.0\bin\gswin64c.exe",
        r"C:\Program Files (x86)\gs\gs10.04.0\bin\gswin32c.exe",
        r"C:\Program Files (x86)\gs\gs10.03.1\bin\gswin32c.exe",
        r"C:\Program Files (x86)\gs\gs10.03.0\bin\gswin32c.exe",
    ]
    
    # Check standard locations
    for path in possible_paths:
        if os.path.exists(path):
            return path
    
    # Search in gs directory
    for program_files in [r"C:\Program Files", r"C:\Program Files (x86)"]:
        gs_base = os.path.join(program_files, "gs")
        if os.path.exists(gs_base):
            for version_dir in os.listdir(gs_base):
                for exe_name in ["gswin64c.exe", "gswin32c.exe"]:
                    gs_path = os.path.join(gs_base, version_dir, "bin", exe_name)
                    if os.path.exists(gs_path):
                        return gs_path
    
    return None

def print_pdf_with_ghostscript(pdf_path, printer_name):
    """
    Print PDF using GhostScript for maximum quality.
    GhostScript renders PDF at high resolution and maintains vector quality.
    
    Args:
        pdf_path (str): Path to PDF file
        printer_name (str): Name of the printer
        
    Returns:
        bool: True if successful
    """
    gs_path = find_ghostscript()
    
    if not gs_path:
        print("GhostScript not found. Install from: https://ghostscript.com/releases/gsdnld.html")
        return False
    
    try:
        # GhostScript command for high-quality printing
        # -dNOPAUSE: Don't pause between pages
        # -dBATCH: Exit after processing
        # -sDEVICE=mswinpr2: Windows printer device (high quality)
        # -dNOSAFER: Allow file operations
        # -r1200: 1200 DPI resolution
        # -sOutputFile: Printer name with %printer% syntax
        
        cmd = [
            gs_path,
            '-dNOPAUSE',
            '-dBATCH',
            '-sDEVICE=mswinpr2',  # Windows printer with high quality
            '-dNOSAFER',
            '-r1200',  # 1200 DPI - matches our PDF quality
            '-dTextAlphaBits=4',  # Anti-aliasing for text
            '-dGraphicsAlphaBits=4',  # Anti-aliasing for graphics
            f'-sOutputFile=%printer%{printer_name}',
            pdf_path
        ]
        
        print(f"Printing with GhostScript at 1200 DPI...")
        result = subprocess.run(
            cmd,
            check=True,
            capture_output=True,
            text=True,
            creationflags=subprocess.CREATE_NO_WINDOW if os.name == 'nt' else 0
        )
        
        print(f"✅ Label sent to printer via GhostScript: {printer_name}")
        return True
        
    except subprocess.CalledProcessError as e:
        print(f"GhostScript print failed: {e}")
        if e.stderr:
            print(f"Error details: {e.stderr}")
        return False
    except Exception as e:
        print(f"Error printing with GhostScript: {e}")
        return False

def check_ghostscript_available():
    """
    Check if GhostScript is available.
    
    Returns:
        tuple: (available: bool, path: str or None)
    """
    gs_path = find_ghostscript()
    return (gs_path is not None, gs_path)

if __name__ == "__main__":
    # Test GhostScript availability
    available, gs_path = check_ghostscript_available()
    
    if available:
        print(f"✅ GhostScript found at: {gs_path}")
        print("GhostScript is available for high-quality PDF printing")
    else:
        print("❌ GhostScript not found")
        print("\nTo install GhostScript:")
        print("1. Download from: https://ghostscript.com/releases/gsdnld.html")
        print("2. Install the Windows 64-bit version")
        print("3. Restart your application")
        print("\nGhostScript provides superior print quality by:")
        print("  • Maintaining vector graphics quality")
        print("  • Rendering at full 1200 DPI")
        print("  • Better text anti-aliasing")