#!/usr/bin/env python3
from mastodon import Mastodon
import json
import os
import tempfile
from subprocess import call
from xdg import BaseDirectory

# load JSON config file
def load_config() -> dict:
    with open(f"{BaseDirectory.xdg_config_home}/tootgopher/config.json") as f:
        config_data = json.load(f)
    return config_data

# create Mastodon object using stored API secrets
# TODO: load config from $XDG_CONFIG_HOME
def gen_masto_obj(config_data: dict) -> Mastodon:
    m = Mastodon(
        access_token = config_data['token'],
        api_base_url = config_data['instance']
    )
    return m

# generate phlog URLs for linking in the post
def gen_url(config_data: dict, phlog_file: str) -> dict:
    base_path = ''
    if phlog_file == '':
        base_path = f"{config_data['gopher']}"
    else:
        base_path = f"{config_data['gopher']}/{config_data['phlog_format']}/{phlog_file}"
    gopher_url = f"gopher://{base_path}"
    proxy_url = f"https://{config_data['proxy']}/{base_path}"
    urls = {'gopher':gopher_url, 'proxy':proxy_url}
    return urls

# spawn $EDITOR or nano by default to edit the post text
def edit_post(post: str) -> str:
    # Fetch OS editor
    EDITOR = os.environ.get('EDITOR', 'nano')
    
    # Temporary File
    tf_file = tempfile.NamedTemporaryFile(suffix = '.tmp', delete = False)
    
    # Paste in the sample post with links generated
    with open(tf_file.name, 'w') as tf:
        tf.write(post)
    
    # Spawn subprocess on a temporary file
    call([EDITOR, tf_file.name])
    
    # Read the file for the final post
    with open(tf_file.name, 'r') as tf:
        post = tf.read()
        tf.close()
    
    # Delete the temp file
    os.unlink(tf_file.name)
    return post

# display post contents and verify with the user
def post_check(post: str, cw: str) -> bool:
    print('You are about to post')
    # If content warning is given
    if (cw != ''):
        print()
        print(f"CW: \"{cw}\"")
    print()
    print(post)
    print()
    will_continue = input('Continue? [y/N] ')
    print()
    return will_continue.upper() in ['Y', 'YES']

def main():
    # load config.json
    # TODO: handle command line switches to override defaults
    config_data = load_config()
    m = gen_masto_obj(config_data)
    
    # generate URLs
    phlog_file = input('Post location (leave blank for root): ')
    urls = gen_url(config_data, phlog_file)
    
    # Read content warning
    cw = input('Content Warning? (Leave blank for none): ')
    
    # Edit post
    post = f"<Replace with your post description>\n\nGopher: {urls['gopher']}\nHTML Proxy: {urls['proxy']}"
    post = edit_post(post)
    
    print()
    # Verify the post with the user and post it
    if post_check(post, cw):
        # Check if content warning is given
        if (cw == ''):
            toot_dict = m.status_post(post, visibility = config_data['visibility'])
        else:
            toot_dict = m.status_post(post, visibility = config_data['visibility'], spoiler_text = cw)
            
        print(f"Posted at {toot_dict['url']}")
    else:
        print('Aborted.')

if __name__ == '__main__':
    main()