from flask import Flask, render_template, request, redirect, url_for, session
import sqlite3
from my_blockchain import Blockchain
import cv2

app = Flask(__name__)
app.secret_key = "e-voting-secure-key"
voting_chain = Blockchain()

# Load face detection model
face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + "haarcascade_frontalface_default.xml")

# Database Connection
def get_db_connection():
    conn = sqlite3.connect('voters.db')
    conn.row_factory = sqlite3.Row
    return conn

# Home Route
@app.route('/')
def home():
    return render_template('index.html')

# Voter Authentication (Live Face Detection)
@app.route('/login', methods=['POST'])
def login():
    voter_name = request.form['name']
    
    # Check voter in database
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("SELECT * FROM voters WHERE name=?", (voter_name,))
    voter = cursor.fetchone()
    conn.close()
    
    if voter:
        # Start Face Verification
        cap = cv2.VideoCapture(0)
        verified = False

        while True:
            ret, frame = cap.read()
            if not ret:
                break

            gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
            faces = face_cascade.detectMultiScale(gray, scaleFactor=1.1, minNeighbors=5, minSize=(100, 100))

            if len(faces) > 0:
                verified = True
                break

            cv2.imshow("Face Verification - Press 'Q' to Exit", frame)
            if cv2.waitKey(1) & 0xFF == ord('q'):
                break

        cap.release()
        cv2.destroyAllWindows()

        if verified:
            session['voter_name'] = voter_name
            return redirect(url_for('vote'))
        else:
            return "❌ Face Verification Failed! Try Again."

    return "❌ Voter Not Found! Please Register First."

# Voting Page
@app.route('/vote', methods=['GET', 'POST'])
def vote():
    if 'voter_name' not in session:
        return redirect(url_for('home'))

    if request.method == 'POST':
        vote_choice = request.form['vote']
        voter_name = session['voter_name']

        voting_chain.add_vote(voter_name, vote_choice)
        session.pop('voter_name', None)

        return redirect(url_for('results'))

    return render_template('vote.html')

# Results Page
@app.route('/results')
def results():
    vote_counts = {}
    for block in voting_chain.chain[1:]:
        vote = block['vote']
        vote_counts[vote] = vote_counts.get(vote, 0) + 1

    return render_template('results.html', votes=vote_counts)

# Run Flask App
if __name__ == '__main__':
    app.run(debug=True)