from flask import Flask, request, render_template, jsonify, redirect, url_for, g
import sqlite3
from flask_oidc import OpenIDConnect
from werkzeug.middleware.proxy_fix import ProxyFix
import os
import json
import psycopg2
import logging

app = Flask(__name__)
app.config.update({
    'SECRET_KEY': os.environ['SECRET'],
    'DEBUG': False,
    'OIDC_CLIENT_SECRETS': json.loads(os.environ['CLIENT_SECRETS']),
    'OIDC_ID_TOKEN_COOKIE_SECURE': False,
    'OIDC_USER_INFO_ENABLED': True,
    'OIDC_OPENID_REALM': 'hottis',
    'OIDC_SCOPES': ['openid', 'email', 'profile']
})

oidc = OpenIDConnect(app)
app.logger.handlers = logging.getLogger('gunicorn.error').handlers

def calculate_nutrition(food, weight):
    try:
        conn = psycopg2.connect()

        with conn.cursor() as cursor:
            # Abfrage der Nährwertdaten aus der Datenbank
            cursor.execute('SELECT kcal, EW, Fett, KH, BST, CA FROM nutrition_table WHERE name = %s', (food,))

            result = cursor.fetchone()

            if result:
                # Runden und Berechnen der Nährwerte basierend auf dem Gewicht
                kcal, ew, fett, kh, bst, ca = result
                nutrition_values = [
                    round(kcal * weight / 100),    # kcal gerundet auf ganze Zahl
                    round(ew * weight / 100, 1),   # EW gerundet auf eine Dezimalstelle
                    round(fett * weight / 100, 1), # Fett gerundet auf eine Dezimalstelle
                    round(kh * weight / 100, 1),   # KH gerundet auf eine Dezimalstelle
                    round(bst * weight / 100, 1),  # BST gerundet auf eine Dezimalstelle
                    round(ca * weight / 100)       # CA gerundet auf ganze Zahl
                ]
                return nutrition_values
            else:
                return None
    finally:
        if conn:
            conn.close()



# Index-Route
@app.route('/')
@oidc.require_login
def index():
    return render_template('index.html')

# ...

@app.route('/get_products')
@oidc.require_login
def get_products():
    try:
        conn = psycopg2.connect()
        with conn.cursor() as cursor:
            cursor.execute('SELECT name FROM nutrition_table')
            products = cursor.fetchall()
            return {'products': [product[0] for product in products]}
    finally:
        if conn:
            conn.close()


# Route zum Hinzufügen und Berechnen von Lebensmitteln
@app.route('/add_lm', methods=['GET'])
@oidc.require_login
def add_lm():
    food = request.args.get('food')
    weight = float(request.args.get('weight'))

    nutrition = calculate_nutrition(food, weight)
    if nutrition:
        # Extrahieren der einzelnen Nährwerte
        kcal, ew, fett, kh, bst, ca = nutrition
        return jsonify({
            "food": food,
            "kcal": kcal,
            "ew": ew,
            "fett": fett,
            "kh": kh,
            "bst": bst,
            "ca": ca
        })
    else:
        return "Lebensmittel nicht gefunden.", 404
    

def convert_decimal(value):
    try:
        return float(value.replace(',', '.'))
    except (ValueError, TypeError):
        return 0.0  # Rückgabe eines Standardwertes im Fehlerfall


@app.route('/add_nutrition', methods=['POST'])
@oidc.accept_token(['openid'])
def add_nutrition():
    app.logger.info("add_nutrition")

    food = request.form.get('food')
    kcal = convert_decimal(request.form.get('kcal'))
    ew = convert_decimal(request.form.get('ew'))
    fett = convert_decimal(request.form.get('fett'))
    kh = convert_decimal(request.form.get('kh'))
    bst = convert_decimal(request.form.get('bst'))
    ca = convert_decimal(request.form.get('ca'))

    # Verbindung zur Datenbank herstellen und Daten einfügen
    try:
        conn = psycopg2.connect()
        with conn.cursor() as cursor:
            cursor.execute("INSERT INTO nutrition_table (name, kcal, ew, fett, kh, bst, ca) VALUES (%s, %s, %s, %s, %s, %s, %s)",
                        (food, kcal, ew, fett, kh, bst, ca))
        conn.commit()
    
        return redirect(url_for('nutrition'))
    except Exception as e:
        app.logger.warn(f"error in add_nutrition: {e}")
        return jsonify({"error": str(e)}), 500
    finally:
        if conn:
            conn.close()


@app.route('/nutrition')
@oidc.require_login
def nutrition():
    return render_template('nutrition.html')

@app.route('/get_token')
@oidc.require_login
def get_token():
    return jsonify(token=oidc.get_access_token())


@app.route('/get_database_entries')
@oidc.require_login
def get_database_entries():
    try:
        # Ersetzen Sie diese Werte mit Ihren Datenbank-Verbindungsinformationen
        conn = psycopg2.connect()
        cursor = conn.cursor()
        with conn.cursor() as cursor:
            cursor.execute("SELECT name, kcal, ew, fett, kh, bst, ca FROM nutrition_table ORDER BY name")
            entries = cursor.fetchall()

        # Umwandeln der Daten in ein JSON-freundliches Format
        entries_list = []
        for entry in entries:
            entries_list.append({
                "food": entry[0],
                "kcal": entry[1],
                "ew": entry[2],
                "fett": entry[3],
                "kh": entry[4],
                "bst": entry[5],
                "ca": entry[6]
            })
        return jsonify(entries_list)
    except Exception as e:
        return jsonify({"error": str(e)}), 500
    finally:
        if conn:
            conn.close()

exposed_app = ProxyFix(app, x_for=1, x_host=1)