from flask import Flask, url_for, redirect, render_template, request, session, Response
from pymongo import MongoClient
from datetime import datetime
from bson.objectid import ObjectId
from werkzeug.security import generate_password_hash, check_password_hash

app = Flask(__name__)
app.secret_key = 'secret_key'

#initialize the database
client = MongoClient('localhost', 27017)
db = client.flask_db
posts_collection = db.posts_collection
users_collection = db.users_collection

#app routes
@app.route('/', methods=['GET'])
def index():
    return render_template('index.html')

@app.route('/board/<board_name>', methods=['GET'])
def board(board_name):
    links = [
        {'name': 'b', 'display_name': '/b/ - random'},
        {'name': 'g', 'display_name': '/g/ - technology'},
        {'name': 'a', 'display_name': '/a/ - anime'},
        {'name': 'v', 'display_name': '/v/ - video games'},
        {'name': 'w', 'display_name': '/w/ - wallpapers'},
        {'name': 'x', 'display_name': '/x/ - paranormal'},
        {'name': 't', 'display_name': '/t/ - test'},
        {'name': 's', 'display_name': '/s/ - soyjaks'},
        {'name': 'pol', 'display_name': '/pol/ - politically incorrect'}
    ]
    
    posts = posts_collection.find({'board_name': board_name}).sort('timestamp', -1)
    display_name = next((link['display_name'] for link in links if link['name'] == board_name), board_name)
    return render_template('board.html', title=board_name, header=display_name, links=links, posts=posts)

@app.route('/post', methods=['POST'])
def post():
    board_name = request.form['board_name']
    content = request.form['content']
    image = request.files['image']
    timestamp = datetime.now()
    if 'user_id' not in session:
        username = 'Anonymous'
    else:
        username = session['username']

    #insert the post into MongoDB
    post_data = {
        'board_name': board_name,
        'content': content,
        'timestamp': timestamp,
        'username' : username
    }

    if image:
        post_data['image'] = image.read()

    posts_collection.insert_one(post_data)

    return redirect(url_for('board', board_name=board_name))

@app.route('/image/<post_id>')
def image(post_id):
    post = posts_collection.find_one({'_id': ObjectId(post_id)})
    if post and 'image' in post:
        return Response(post['image'], mimetype='image/jpeg')
    else:
        return 'Image not found', 404

@app.route('/login', methods=['GET'])
def login():
    return render_template('login.html')

@app.route('/login', methods=['POST'])
def login_post():
    username = request.form['username']
    password = request.form['password']

    user = users_collection.find_one({'username': username})
    if user and check_password_hash(user['password'], password):
        session['user_id'] = str(user['_id'])
        session['username'] = username
        return redirect(url_for('index'))
    elif user == 'admin' and check_password_hash(user['password'], password):
        session['user_id'] = str(user['_id'])
        session['username'] = username
        return redirect(url_for('admin'))
    else:
        return redirect(url_for('login'))
    
@app.route('/register', methods=['GET'])
def register():
    regalert = request.args.get('regalert', '')
    return render_template('register.html', regalert=regalert)

@app.route('/register', methods=['POST'])
def register_post():
    username = request.form['username']
    password = request.form['password']
    hashed_password = generate_password_hash(password, method='pbkdf2:sha256')
    regalert = ''

    if users_collection.find_one({'username': username}):
        regalert = 'username already exists!'
        return redirect(url_for('register', regalert=regalert))
    else:
        # Insert the user into MongoDB
        users_collection.insert_one({
            'username': username,
            'password': hashed_password
        })

    return redirect(url_for('login'))

@app.route('/admin', methods=['GET'])
def admin():
    admin_user = users_collection.find_one({'username': 'admin'})
    success = request.args.get('success', '')
    if admin_user or session['user_id'] != str(admin_user['_id']):
        return render_template('admin.html', success=success)
    else:
        return url_for('index')

@app.route('/deletepost', methods=['POST'])
def deletepost():
    admin_user = users_collection.find_one({'username': 'admin'})
    if not admin_user or session['user_id'] != str(admin_user['_id']):
        return redirect(url_for('index'))
    else:
        post_id = request.form['post_id']
        posts_collection.delete_one({'_id': ObjectId(post_id)})
        success = 'post deleted!'
        return redirect(url_for('admin', success=success))

@app.route('/logout')
def logout():
    session.pop('user_id', None)
    return redirect(url_for('index'))


if __name__ == '__main__':
    app.run(debug=True)