#!/usr/bin/env python3
import json
import os
import sys
from PIL import Image

source, target, cap, quality = sys.argv[1], sys.argv[2], int(sys.argv[3]), int(sys.argv[4])
ext = os.path.splitext(target)[1].lower()
with Image.open(source) as image:
    image = image.convert('RGB')
    source_width, source_height = image.size
    if len(sys.argv) == 9:
        x, y, width, height = [int(v) for v in sys.argv[5:9]]
        image = image.crop((x, y, x + width, y + height))
    scale = min(1.0, cap / max(image.width, image.height))
    if scale < 1.0:
        image = image.resize((round(image.width * scale), round(image.height * scale)), Image.Resampling.LANCZOS)
    if ext in ('.jpg', '.jpeg'):
        image.save(target, 'JPEG', quality=quality, optimize=True)
        mime = 'image/jpeg'
    elif ext == '.png':
        image.save(target, 'PNG', optimize=True)
        mime = 'image/png'
    else:
        image.save(target, 'WEBP', quality=quality, method=4)
        mime = 'image/webp'

    print(json.dumps({
        'source_width': source_width,
        'source_height': source_height,
        'width': image.width,
        'height': image.height,
        'scale': scale,
        'mime': mime,
    }))