#!/usr/bin/env python3
# view_image – view an image file as a base64-encoded markdown image
import base64
import mimetypes
import pathlib
import sys

VALID_MIME_TYPES = {
    "image/png",
    "image/jpeg",
    "image/webp",
}

if len(sys.argv) != 2:
    sys.exit(f"usage: {pathlib.Path(sys.argv[0]).name} <image-file>")

img_path = pathlib.Path(sys.argv[1])

if not img_path.exists():
    sys.exit(f"Error: File '{img_path}' does not exist")

if not img_path.is_file():
    sys.exit(f"Error: '{img_path}' is not a file")

try:
    mime = mimetypes.guess_type(img_path.name)[0]
    if mime not in VALID_MIME_TYPES:
        sys.exit(f"Error: Unsupported image type: {mime}. Valid types are: {', '.join(VALID_MIME_TYPES)}")

    # read the file, base64-encode, and convert bytes → str
    b64 = base64.b64encode(img_path.read_bytes()).decode("ascii")

    # write the exact markdown snippet to stdout
    print(f"![{img_path.as_posix()}](data:{mime};base64,{b64})")
except Exception as e:
    sys.exit(f"Error processing image: {e}")