#!/usr/bin/env python
# -*- coding: utf-8 -*-

import argparse
import os
import shutil
import subprocess
import glob
import re
from pathlib import Path

def create_video(input_dir, sample, temp_dir, step_multiplier, repeat, max_images):
    output_filename = f"{os.path.basename(os.getcwd())}_sample{sample}.mp4"
    print(f"Processing sample {sample}. Output filename: {output_filename}")
    
    # Create repeated images
    print(f"Creating repeated images for sample {sample}...")
    for img in glob.glob(f"{input_dir}/*_{sample}_*.png"):
        for i in range(repeat):
            base = os.path.splitext(os.path.basename(img))[0]
            shutil.copy(img, f"{temp_dir}/{base}_{i+1}.png")
    
    # Prepare ffmpeg options
    vf_options = "scale=1024x1024"
    if step_multiplier:
        vf_options += f",drawtext=fontfile=/usr/share/fonts/TTF/Inconsolata-Light.ttf:text='Steps\\: %{{expr\\:trunc(n*{step_multiplier}/{repeat})}}':x=10:y=h-th-10:fontsize=24:fontcolor=white"
    
    if max_images:
        vf_options = f"select='not(mod(n\\,{max_images}))',{vf_options}"
    
    # Run first ffmpeg command
    temp_output = f"{temp_dir}/temp_{sample}.mp4"
    ffmpeg_cmd = [
        "ffmpeg", "-framerate", "60",
        "-pattern_type", "glob", "-i", f"{temp_dir}/*_{sample}_*.png",
        "-vf", vf_options,
        "-crf", "18", "-c:v", "libx264", "-b:v", "12M",
        "-pix_fmt", "yuv420p", "-y", temp_output
    ]
    
    try:
        subprocess.run(ffmpeg_cmd, check=True)
    except subprocess.CalledProcessError:
        print(f"Error: ffmpeg command failed for sample {sample}.")
        return False
    
    # Get duration and process final video
    try:
        duration_cmd = ["ffmpeg", "-i", temp_output]
        result = subprocess.run(duration_cmd, capture_output=True, text=True)
        duration_match = re.search(r'Duration: (\d{2}):(\d{2}):(\d{2})', result.stderr)
        if duration_match:
            hours, minutes, seconds = map(float, duration_match.groups())
            duration = hours * 3600 + minutes * 60 + seconds
            fade_start = duration + 3
            
            final_cmd = [
                "ffmpeg", "-i", temp_output,
                "-vf", f"tpad=stop_mode=clone:stop_duration=8,fade=t=out:st={fade_start}:d=5",
                "-c:v", "libx264", "-b:v", "12M", "-crf", "18",
                "-pix_fmt", "yuv420p", "-y", output_filename
            ]
            subprocess.run(final_cmd, check=True)
        else:
            print("Error: Could not determine video duration.")
            return False
            
    except subprocess.CalledProcessError:
        print(f"Error: Final ffmpeg processing failed for sample {sample}.")
        return False
    
    # Clean up temporary files for this sample
    for f in glob.glob(f"{temp_dir}/*_{sample}_*.png"):
        os.remove(f)
    os.remove(temp_output)
    
    return True

def get_step_size_from_filenames(sample):
    files = sorted(glob.glob(f"*_{sample}_*.png"))
    if len(files) < 2:
        return None
    
    # Extract step numbers from first two files
    pattern = r'_(\d{6})_'
    first_match = re.search(pattern, files[0])
    second_match = re.search(pattern, files[1])
    
    if first_match and second_match:
        first_step = int(first_match.group(1))
        second_step = int(second_match.group(1))
        return second_step - first_step
    return None

def main():
    parser = argparse.ArgumentParser(description='Convert PNG sequence to MP4')
    parser.add_argument('--max', type=int, help='Maximum number of images')
    parser.add_argument('--step', type=int, help='Step multiplier')
    parser.add_argument('--repeat', type=int, default=1, help='Repeat count')
    parser.add_argument('--steps-from-filename', action='store_true', help='Calculate steps from filename')
    
    args = parser.parse_args()
    
    # Create temporary directory
    temp_dir = os.path.expanduser("~/.local/tmp")
    os.makedirs(temp_dir, exist_ok=True)
    print("Created temporary directory...")
    
    # Check for PNG files
    png_files = glob.glob("*.png")
    if not png_files:
        print("Error: No PNG files found in the current directory.")
        return 1
    
    # Find all unique sample numbers
    sample_pattern = r'_(\d{2})_'
    samples = sorted(set(re.findall(sample_pattern, ' '.join(png_files))))
    
    for sample in samples:
        if args.steps_from_filename:
            step_multiplier = get_step_size_from_filenames(sample)
            if step_multiplier:
                print(f"Detected step size: {step_multiplier}")
            else:
                print("Error: Could not determine step size from filenames")
                continue
        else:
            step_multiplier = args.step
        
        success = create_video(".", sample, temp_dir, step_multiplier, args.repeat, args.max)
        if not success:
            shutil.rmtree(temp_dir)
            return 1
    
    # Clean up
    print("Cleaning up temporary directory...")
    shutil.rmtree(temp_dir)
    print("All samples processed successfully.")
    return 0

if __name__ == "__main__":
    exit(main())