import os
import sys
from PIL import Image
import time

# Define suffix lists for BaseColor, Normal, RMA/ORM
BASECOLOR_SUFFIXES = ['_alb', '_albedo', '_bc', '_basecolor', '_b']
NORMAL_SUFFIXES = ['_nrm', '_normal', '_n']
RMA_SUFFIXES = ['_rma']
ORM_SUFFIXES = ['_orm']
EMISSIVE_SUFFIXES = ['_emissive']
OPACITY_SUFFIXES = ['_opacity']

def detect_texture_type(filename):
    """ Detects the type of texture based on its suffix """
    if any(suffix in filename.lower() for suffix in BASECOLOR_SUFFIXES):
        return 'BaseColor'
    elif any(suffix in filename.lower() for suffix in NORMAL_SUFFIXES):
        return 'Normal'
    elif any(suffix in filename.lower() for suffix in RMA_SUFFIXES):
        return 'RMA'
    elif any(suffix in filename.lower() for suffix in ORM_SUFFIXES):
        return 'ORM'
    elif any(suffix in filename.lower() for suffix in EMISSIVE_SUFFIXES):
        return 'Emissive'
    elif any(suffix in filename.lower() for suffix in OPACITY_SUFFIXES):
        return 'Opacity'
    return None

def get_material_name(filename):
    """ Strips the 'T_' or 'TX_' prefix and returns the material name """
    base_name = os.path.basename(filename)
    if base_name.startswith('T_'):
        return base_name[2:].split('_')[0]  # Assumes 'T_Material_Suffix'
    elif base_name.startswith('TX_'):
        return base_name[3:].split('_')[0]  # Assumes 'TX_Material_Suffix'
    return base_name.split('_')[0]

def process_textures(input_files):
    """ Main function to process all textures in a folder and convert to BCR/NMO """
    textures = {}
    
    # Group files by material name
    for filepath in input_files:
        filename = os.path.basename(filepath)
        material_name = get_material_name(filename)
        texture_type = detect_texture_type(filename)
        
        if material_name not in textures:
            textures[material_name] = {}
        textures[material_name][texture_type] = filepath
    
    # Create a merged folder in the same directory as the input
    base_path = os.path.dirname(input_files[0])
    output_folder = os.path.join(base_path, 'merged')
    os.makedirs(output_folder, exist_ok=True)
    
    # Process each material group
    for material, files in textures.items():
        basecolor_file = files.get('BaseColor')
        normal_file = files.get('Normal')
        rma_file = files.get('RMA')
        orm_file = files.get('ORM')
        emissive_file = files.get('Emissive')
        opacity_file = files.get('Opacity')
        
        if basecolor_file and normal_file and (rma_file or orm_file):
            # Convert to BCR/NMO format
            convert_to_bcr_nmo(material, basecolor_file, normal_file, rma_file, orm_file, emissive_file, opacity_file, output_folder)
            print(f"{material}: Successfully converted.")
        else:
            print(f"Skipping {material}: missing necessary files")
	
    print("+++All materials successfully converted+++")
    time.sleep(3)

def convert_to_bcr_nmo(material, basecolor_file, normal_file, rma_file, orm_file, emissive_file, opacity_file, output_folder):
    """ Converts given textures to BCR and NMO formats """
    basecolor_img = Image.open(basecolor_file).convert('RGBA')
    normal_img = Image.open(normal_file).convert('RGBA')
    
    if rma_file:
        rma_img = Image.open(rma_file).convert('RGBA')
        # BCR conversion
        bcr_img = Image.merge('RGBA', (basecolor_img.split()[0], basecolor_img.split()[1], basecolor_img.split()[2], rma_img.split()[0]))  # Use Roughness (Alpha from RMA/ORM)
        bcr_img.save(os.path.join(output_folder, f"{material}_BCR.png"))
        # NMO conversion
        nmo_img = Image.merge('RGBA', (normal_img.split()[0], normal_img.split()[1], rma_img.split()[1], rma_img.split()[2]))  # Use Metallic, AO from RMA/ORM
        nmo_img.save(os.path.join(output_folder, f"{material}_NMO.png"))
    elif orm_file:
        rma_img = Image.open(orm_file).convert('RGBA')
        # BCR conversion
        bcr_img = Image.merge('RGBA', (basecolor_img.split()[0], basecolor_img.split()[1], basecolor_img.split()[2], rma_img.split()[1]))  # Use Roughness (Alpha from RMA/ORM)
        bcr_img.save(os.path.join(output_folder, f"{material}_BCR.png"))
        # NMO conversion
        nmo_img = Image.merge('RGBA', (normal_img.split()[0], normal_img.split()[1], rma_img.split()[2], rma_img.split()[0]))  # Use Metallic, AO from RMA/ORM
        nmo_img.save(os.path.join(output_folder, f"{material}_NMO.png"))
    # Optionally handle emissive and opacity maps
    if emissive_file:
        emissive_img = Image.open(emissive_file).convert('RGB')
        emissive_img.save(os.path.join(output_folder, f"{material}_EM.png"))
    
    if opacity_file:
        opacity_img = Image.open(opacity_file).convert('L')
        opacity_img.save(os.path.join(output_folder, f"{material}_OP.png"))
if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: drag and drop texture files onto the script")
    else:
        # Get the file paths from sys.argv (ignoring the first argument which is the script name)
        input_files = sys.argv[1:]
        process_textures(input_files)