from flask import Flask, url_for, render_template
import os
import json
from app.config import PANDOC_LINK, PANDOC_PATH
import subprocess

app = Flask(__name__)


@app.context_processor
def override_url_for():
    return dict(url_for=dated_url_for)


#TODO: make instead of datetime hash of commit


def dated_url_for(endpoint, **values):
    if endpoint == 'static':
        filename = values.get('filename', None)
        if filename:
            file_path = os.path.join(app.root_path, endpoint, filename)
            values['q'] = int(os.stat(file_path).st_mtime)
    return url_for(endpoint, **values)


@app.route(f'/{PANDOC_LINK}/<page>')
def get_pandoc_page(page):
    with open(f'{PANDOC_PATH}/{page}/config.json') as f:
        data = json.loads(f.read())
    filename = f'{PANDOC_PATH}/{page}/main.md'
    inserted = subprocess.Popen(f'pandoc {filename} -t html --mathjax', shell=True, stdout=subprocess.PIPE).stdout.read().decode('utf-8')
    template = data['template']
    return render_template(template, markdown=inserted)


@app.route('/')
def index():
    return render_template('index.html')