#!/usr/bin/python3
import sys
import os
import argparse
import time
import tempfile
	
def make_dir(d):
	if not os.path.exists(d):
		os.mkdir(d)
		
def delete_all(d):
	files = list_all(d)
	if not files:
		return
	x = input("Delete the above files? y/N ")
	if x.lower() != 'y':
		return
	for file in files:
		f = os.path.join(d,file)
		os.remove(f)
		print(f"removing: {f}")
	print("Done")
	
def list_all(d):
	if not os.path.exists(d):
		print("Skratch path doesn't exist")
		return 0
	files = os.listdir(d)
	if files == []:
		print("No skratch files exist")
	else:
		for file in files:
			print(file)
	return files
	
def get_editor(use_v):
	v = os.getenv("VISUAL")
	e = os.getenv("EDITOR")
	if (not v and not e):
		e = "nano"
	if use_v and v:
		return v
	return e
	
def run(editor, sk_path, filename=None):
	if not filename:
		t = time.localtime()
		filename = f"skratch-{t.tm_year}-{t.tm_mon}-{t.tm_mday}-"
		fd, fp = tempfile.mkstemp(prefix=filename, dir=sk_path)
		os.close(fd)
	else:
		fp = os.path.join(sk_path, filename)
	if fp != None:
		os.execvp(editor, [editor,fp])
	
def main():
	home_path = os.getenv("HOME")
	sk_path = os.path.join(home_path, ".skratch")
	make_dir(sk_path)
	
	parser = argparse.ArgumentParser(
		prog='skratch', 
		description='Creates a temp file and opens it in an editor', 
		epilog='Text at the bottom of help')
	
	group = parser.add_mutually_exclusive_group()
	
	group.add_argument(
		"filename",
		nargs="?",
		help="open file in ~/.skratch",
		default=None)
	
	group.add_argument(
		"-c", 
		help="delete all files", 
		action="store_true")	
	
	group.add_argument(
		"-l", 
		help="list files", 
		action="store_true")
	
	parser.add_argument(
		"-v", 
		help="visual editor", 
		action="store_true")
		
	args = parser.parse_args()
	
	editor = get_editor(args.v)
	if args.c: delete_all(sk_path)
	elif args.l: list_all(sk_path)
	else: run(editor,sk_path, args.filename)

main()