import os
import sqlite3
from flask import Flask, request, session, g, redirect, url_for, abort, render_template, flash

app = Flask(__name__)
app.config.from_object(__name__)

app.config.update(dict(
    DATABASE=os.path.join(app.root_path, 'flask.db'),
    SECRET_KEY='dev_key',
    USERNAME='root',
    PASSWORD='root'
))

app.config.from_envvar('FLASK_SETTING', silent=True)

def connect_db():
    rv = sqlite3.connect(app.config['DATABASE'])
    rv.row_factory = sqlite3.Row

    return rv

def get_db():
    if not hasattr(g, 'sqlite_db'):
        g.sqlite_db = connect_db()

    return g.sqlite_db

@app.teardown_appcontext
def close_db(error):
    if hasattr(g, 'sqlite_db'):
        g.sqlite_db.close()

def init_db():
    db = get_db()
    with app.open_resource('schema.sql', mode='r') as f:
        db.cursor().executescript(f.read())
    db.commit()

@app.cli.command('initdb')
def initdb_command():
    init_db()
    print('Initialized the database.')

@app.route('/')
def show_entries():
    db = get_db()
    cur = db.execute('select title, text from entries order by id desc')
    entries = cur.fetchall()

    return render_template('show_entries.html', entries=entries)

@app.route('/add', methods=['POST'])
def add_entry():
    if not session.get('logged_in'):
        abort(401)

    db = get_db()
    db.execute('insert into entries (title, text) values (?, ?)', [request.form['title'], request.form['text']])
    db.commit()

    flash('New entry successfully posted.')
    return redirect(url_for('show_entries'))

@app.route('/login', methods=['GET', 'POST'])
def login():
    error = None

    if request.method == 'POST':
        if request.form['username'] != app.config['USERNAME']:
            error = 'Invalid username'
        elif request.form['password'] != app.config['PASSWORD']:
            error = 'Invalid password'
        else:
            session['logged_in'] = True
            flash('You are logged in.')
            return redirect(url_for('show_entries'))

    return render_template('login.html', error=error)

@app.route('/logout')
def logout():
    session.pop('logged_in', None)
    flash('You are logged out.')

    return redirect(url_for('show_entries'))