import logging
import psycopg2
import psycopg2.extras

from flask import Flask, render_template, g, redirect, request, url_for

logging.basicConfig(format="%(asctime)s %(levelname)s %(name)s %(lineno)d | %(message)s", level=logging.DEBUG)

app = Flask(__name__)

log = logging.getLogger(__name__)

@app.route("/")
def home():
    csr = get_cursor()
    csr.execute("select * from books where current")
    books = csr.fetchall()
    return render_template("home.html", books=books)

@app.route("/book/<id>")
def book(id):
    csr = get_cursor()
    csr.execute("select * from books where id = %s", (id,))
    book = csr.fetchone()
    csr.execute("select * from bookmarks where book = %s order by ts desc", (id,))
    bookmarks = csr.fetchall()
    return render_template("book.html", book=book, bookmarks=bookmarks)

@app.route("/book/<id>/mark", methods=["POST"])
def bookmark(id):
    page = request.form["page"]
    csr = get_cursor()
    csr.execute("insert into bookmarks(book, page) values(%s, %s)", (id, page,))
    return redirect(url_for("book", id=id), code=303)

def get_cursor():
    db = get_db()
    csr = db.cursor(cursor_factory=psycopg2.extras.NamedTupleCursor)
    return csr

def get_db():
    if "db" not in g:
        g.db = psycopg2.connect(dbname="lesetagebuch")
    return g.db

@app.teardown_appcontext
def teardown_db(exception):
    log.info("in teardown_db: exception = %s", exception)
    db = g.pop('db', None)
    if db is not None:
        if not exception:
            try:
                db.commit()
            except:
                pass
        db.rollback()
        db.close()