import os
import sys
# single thread doubles cuda performance - needs to be set before torch import
if any(arg.startswith('--execution-provider') for arg in sys.argv):
    os.environ['OMP_NUM_THREADS'] = '1'
# reduce tensorflow log level
os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'
import warnings
from typing import List
import platform
import signal
import shutil
import argparse
try:
    import torch
    HAS_TORCH = True
except ImportError:
    HAS_TORCH = False
import onnxruntime
import tensorflow

import modules.globals
import modules.metadata
import modules.ui as ui
from modules.processors.frame.core import get_frame_processors_modules
from modules.utilities import has_image_extension, is_image, is_video, detect_fps, create_video, extract_frames, get_temp_frame_paths, restore_audio, create_temp, move_temp, clean_temp, normalize_output_path

if HAS_TORCH and 'ROCMExecutionProvider' in modules.globals.execution_providers:
    del torch

warnings.filterwarnings('ignore', category=FutureWarning, module='insightface')
if HAS_TORCH:
    warnings.filterwarnings('ignore', category=UserWarning, module='torchvision')


def parse_args() -> None:
    signal.signal(signal.SIGINT, lambda signal_number, frame: destroy())
    program = argparse.ArgumentParser()
    program.add_argument('-s', '--source', help='select an source image', dest='source_path')
    program.add_argument('-t', '--target', help='select an target image or video', dest='target_path')
    program.add_argument('-o', '--output', help='select output file or directory', dest='output_path')
    program.add_argument('--frame-processor', help='pipeline of frame processors', dest='frame_processor', default=['face_swapper'], choices=['face_swapper', 'face_enhancer', 'face_enhancer_gpen256', 'face_enhancer_gpen512'], nargs='+')
    program.add_argument('--keep-fps', help='keep original fps', dest='keep_fps', action='store_true', default=False)
    program.add_argument('--keep-audio', help='keep original audio', dest='keep_audio', action='store_true', default=True)
    program.add_argument('--keep-frames', help='keep temporary frames', dest='keep_frames', action='store_true', default=False)
    program.add_argument('--many-faces', help='process every face', dest='many_faces', action='store_true', default=False)
    program.add_argument('--nsfw-filter', help='filter the NSFW image or video', dest='nsfw_filter', action='store_true', default=False)
    program.add_argument('--map-faces', help='map source target faces', dest='map_faces', action='store_true', default=False)
    program.add_argument('--mouth-mask', help='mask the mouth region', dest='mouth_mask', action='store_true', default=False)
    program.add_argument('--video-encoder', help='adjust output video encoder', dest='video_encoder', default='libx264', choices=['libx264', 'libx265', 'libvpx-vp9'])
    program.add_argument('--video-quality', help='adjust output video quality', dest='video_quality', type=int, default=18, choices=range(52), metavar='[0-51]')
    program.add_argument('-l', '--lang', help='Ui language', default="en")
    program.add_argument('--live-mirror', help='The live camera display as you see it in the front-facing camera frame', dest='live_mirror', action='store_true', default=False)
    program.add_argument('--live-resizable', help='The live camera frame is resizable', dest='live_resizable', action='store_true', default=False)
    program.add_argument('--max-memory', help='maximum amount of RAM in GB', dest='max_memory', type=int, default=suggest_max_memory())
    program.add_argument('--execution-provider', help='execution provider', dest='execution_provider', default=['cpu'], choices=suggest_execution_providers(), nargs='+')
    program.add_argument('--execution-threads', help='number of execution threads', dest='execution_threads', type=int, default=suggest_execution_threads())
    program.add_argument('-v', '--version', action='version', version=f'{modules.metadata.name} {modules.metadata.version}')

    # register deprecated args
    program.add_argument('-f', '--face', help=argparse.SUPPRESS, dest='source_path_deprecated')
    program.add_argument('--cpu-cores', help=argparse.SUPPRESS, dest='cpu_cores_deprecated', type=int)
    program.add_argument('--gpu-vendor', help=argparse.SUPPRESS, dest='gpu_vendor_deprecated')
    program.add_argument('--gpu-threads', help=argparse.SUPPRESS, dest='gpu_threads_deprecated', type=int)

    args = program.parse_args()

    modules.globals.source_path = args.source_path
    modules.globals.target_path = args.target_path
    modules.globals.output_path = normalize_output_path(modules.globals.source_path, modules.globals.target_path, args.output_path)
    modules.globals.frame_processors = args.frame_processor
    modules.globals.headless = args.source_path or args.target_path or args.output_path
    modules.globals.keep_fps = args.keep_fps
    modules.globals.keep_audio = args.keep_audio
    modules.globals.keep_frames = args.keep_frames
    modules.globals.many_faces = args.many_faces
    modules.globals.mouth_mask = args.mouth_mask
    modules.globals.nsfw_filter = args.nsfw_filter
    modules.globals.map_faces = args.map_faces
    modules.globals.video_encoder = args.video_encoder
    modules.globals.video_quality = args.video_quality
    modules.globals.live_mirror = args.live_mirror
    modules.globals.live_resizable = args.live_resizable
    modules.globals.max_memory = args.max_memory
    modules.globals.execution_providers = decode_execution_providers(args.execution_provider)
    modules.globals.execution_threads = args.execution_threads
    modules.globals.lang = args.lang

    #for ENHANCER tumblers:
    for enhancer_key in ('face_enhancer', 'face_enhancer_gpen256', 'face_enhancer_gpen512'):
        modules.globals.fp_ui[enhancer_key] = enhancer_key in args.frame_processor

    # translate deprecated args
    if args.source_path_deprecated:
        print('\033[33mArgument -f and --face are deprecated. Use -s and --source instead.\033[0m')
        modules.globals.source_path = args.source_path_deprecated
        modules.globals.output_path = normalize_output_path(args.source_path_deprecated, modules.globals.target_path, args.output_path)
    if args.cpu_cores_deprecated:
        print('\033[33mArgument --cpu-cores is deprecated. Use --execution-threads instead.\033[0m')
        modules.globals.execution_threads = args.cpu_cores_deprecated
    if args.gpu_vendor_deprecated == 'apple':
        print('\033[33mArgument --gpu-vendor apple is deprecated. Use --execution-provider coreml instead.\033[0m')
        modules.globals.execution_providers = decode_execution_providers(['coreml'])
    if args.gpu_vendor_deprecated == 'nvidia':
        print('\033[33mArgument --gpu-vendor nvidia is deprecated. Use --execution-provider cuda instead.\033[0m')
        modules.globals.execution_providers = decode_execution_providers(['cuda'])
    if args.gpu_vendor_deprecated == 'amd':
        print('\033[33mArgument --gpu-vendor amd is deprecated. Use --execution-provider cuda instead.\033[0m')
        modules.globals.execution_providers = decode_execution_providers(['rocm'])
    if args.gpu_threads_deprecated:
        print('\033[33mArgument --gpu-threads is deprecated. Use --execution-threads instead.\033[0m')
        modules.globals.execution_threads = args.gpu_threads_deprecated


def encode_execution_providers(execution_providers: List[str]) -> List[str]:
    return [execution_provider.replace('ExecutionProvider', '').lower() for execution_provider in execution_providers]


def decode_execution_providers(execution_providers: List[str]) -> List[str]:
    return [provider for provider, encoded_execution_provider in zip(onnxruntime.get_available_providers(), encode_execution_providers(onnxruntime.get_available_providers()))
            if any(execution_provider in encoded_execution_provider for execution_provider in execution_providers)]


def suggest_max_memory() -> int:
    if platform.system().lower() == 'darwin':
        return 4
    return 16


def suggest_execution_providers() -> List[str]:
    return encode_execution_providers(onnxruntime.get_available_providers())


def suggest_execution_threads() -> int:
    """Suggest optimal thread count based on hardware and execution provider."""
    import os
    
    # Get CPU count
    cpu_count = os.cpu_count() or 4
    
    if 'DmlExecutionProvider' in modules.globals.execution_providers:
        return 1
    if 'ROCMExecutionProvider' in modules.globals.execution_providers:
        return 1
    if 'CUDAExecutionProvider' in modules.globals.execution_providers:
        # For CUDA, use more threads for parallel frame processing
        return min(cpu_count, 16)
    
    # For CPU execution, use most cores but leave some for system
    return max(4, min(cpu_count - 2, 16))


def limit_resources() -> None:
    # prevent tensorflow memory leak
    gpus = tensorflow.config.experimental.list_physical_devices('GPU')
    for gpu in gpus:
        tensorflow.config.experimental.set_memory_growth(gpu, True)
    # limit memory usage
    if modules.globals.max_memory:
        memory = modules.globals.max_memory * 1024 ** 3
        if platform.system().lower() == 'darwin':
            memory = modules.globals.max_memory * 1024 ** 6
        if platform.system().lower() == 'windows':
            import ctypes
            kernel32 = ctypes.windll.kernel32
            kernel32.SetProcessWorkingSetSize(-1, ctypes.c_size_t(memory), ctypes.c_size_t(memory))
        else:
            import resource
            resource.setrlimit(resource.RLIMIT_DATA, (memory, memory))


def release_resources() -> None:
    if 'CUDAExecutionProvider' in modules.globals.execution_providers and HAS_TORCH:
        torch.cuda.empty_cache()


def pre_check() -> bool:
    if sys.version_info < (3, 9):
        update_status('Python version is not supported - please upgrade to 3.9 or higher.')
        return False
    if not shutil.which('ffmpeg'):
        update_status('ffmpeg is not installed.')
        return False
    return True


def update_status(message: str, scope: str = 'DLC.CORE') -> None:
    print(f'[{scope}] {message}')
    if not modules.globals.headless:
        ui.update_status(message)

def start() -> None:
    """Start processing with performance monitoring."""
    import time
    
    start_time = time.time()
    
    for frame_processor in get_frame_processors_modules(modules.globals.frame_processors):
        if not frame_processor.pre_start():
            return
    update_status('Processing...')
    
    # process image to image
    if has_image_extension(modules.globals.target_path):
        if modules.globals.nsfw_filter and ui.check_and_ignore_nsfw(modules.globals.target_path, destroy):
            return
        try:
            shutil.copy2(modules.globals.target_path, modules.globals.output_path)
        except Exception as e:
            print("Error copying file:", str(e))
        for frame_processor in get_frame_processors_modules(modules.globals.frame_processors):
            update_status('Progressing...', frame_processor.NAME)
            frame_processor.process_image(modules.globals.source_path, modules.globals.output_path, modules.globals.output_path)
            release_resources()
        if is_image(modules.globals.target_path):
            elapsed = time.time() - start_time
            update_status(f'Processing to image succeed! (Time: {elapsed:.2f}s)')
        else:
            update_status('Processing to image failed!')
        return
    
    # process image to videos
    if modules.globals.nsfw_filter and ui.check_and_ignore_nsfw(modules.globals.target_path, destroy):
        return

    extraction_start = time.time()
    if not modules.globals.map_faces:
        update_status('Creating temp resources...')
        create_temp(modules.globals.target_path)
        update_status('Extracting frames...')
        extract_frames(modules.globals.target_path)
    extraction_time = time.time() - extraction_start
    update_status(f'Frame extraction completed in {extraction_time:.2f}s')

    temp_frame_paths = get_temp_frame_paths(modules.globals.target_path)
    total_frames = len(temp_frame_paths)
    update_status(f'Processing {total_frames} frames with {modules.globals.execution_threads} threads...')
    
    processing_start = time.time()
    for frame_processor in get_frame_processors_modules(modules.globals.frame_processors):
        update_status('Progressing...', frame_processor.NAME)
        frame_processor.process_video(modules.globals.source_path, temp_frame_paths)
        release_resources()
    processing_time = time.time() - processing_start
    fps_processing = total_frames / processing_time if processing_time > 0 else 0
    update_status(f'Frame processing completed in {processing_time:.2f}s ({fps_processing:.2f} fps)')
    
    # handles fps
    encoding_start = time.time()
    if modules.globals.keep_fps:
        update_status('Detecting fps...')
        fps = detect_fps(modules.globals.target_path)
        update_status(f'Creating video with {fps} fps...')
        create_video(modules.globals.target_path, fps)
    else:
        update_status('Creating video with 30.0 fps...')
        create_video(modules.globals.target_path)
    encoding_time = time.time() - encoding_start
    update_status(f'Video encoding completed in {encoding_time:.2f}s')
    
    # handle audio
    if modules.globals.keep_audio:
        if modules.globals.keep_fps:
            update_status('Restoring audio...')
        else:
            update_status('Restoring audio might cause issues as fps are not kept...')
        restore_audio(modules.globals.target_path, modules.globals.output_path)
    else:
        move_temp(modules.globals.target_path, modules.globals.output_path)
    
    # clean and validate
    clean_temp(modules.globals.target_path)
    
    total_time = time.time() - start_time
    if is_video(modules.globals.target_path):
        update_status(f'Processing to video succeed! Total time: {total_time:.2f}s')
    else:
        update_status('Processing to video failed!')


def destroy(to_quit=True) -> None:
    if modules.globals.target_path:
        clean_temp(modules.globals.target_path)
    if to_quit: quit()


def run() -> None:
    parse_args()
    if not pre_check():
        return
    for frame_processor in get_frame_processors_modules(modules.globals.frame_processors):
        if not frame_processor.pre_check():
            return
    limit_resources()
    if modules.globals.headless:
        start()
    else:
        window = ui.init(start, destroy, modules.globals.lang)
        window.mainloop()
