#!/usr/bin/python3

import sys
import os
import random
import string
import argparse
	
def make_dir(d):
	if not os.path.exists(d):
		os.mkdir(d)
		
def delete_all(d):
	if not os.path.exists(d):
		print("Nothing to delete")
	else:
		for file in os.listdir(d):
			os.remove(d+file)
			print(f"removing: {d+file}")
		print("Done")
		
def list_all(d):
	if not os.path.exists(d):
		print("Nothing to list")
	else:
		for file in os.listdir(d):
			print(file)
	
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 mkstemp(fp):
	if fp[-6:] == "XXXXXX":
		for x in range(0,1000):
			r = ''.join(random.choices(string.ascii_letters, k=6))
			fp = fp[:-6] + r
			if not os.path.exists(fp):
				return fp
		print("Error: Could not create new file, try running skratch -c and try again")
		return None
	else:
		print(f'Error: mkstemp got filepath: {fp}')
		return None
		
def run(editor, sk_path, filename=None):
	if not filename:
		filename = "skratch-XXXXXX"
		fp = os.path.join(sk_path, filename)
		fp = mkstemp(fp)
	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(
		"-c", 
		help="delete all files", 
		action="store_true")	
	
	group.add_argument(
		"-l", 
		help="list files", 
		action="store_true")
	
	group.add_argument(
		"-o", 
		help="open file", 
		action="store")
	
	parser.add_argument(
		"-v", 
		help="visual editor", 
		action="store_true")
		
	args = parser.parse_args()
	
	filename = "skratch-XXXXXX"
	
	editor = get_editor(args.v)
	if args.o: run(editor,sk_path,args.o)
	elif args.c: delete_all(sk_path)
	elif args.l: list_all(sk_path)
	else: run(editor,sk_path)

main()