main.py

from flask import Flask ,render_template , flash, request , send_file 
import numpy as np
from werkzeug.utils import secure_filename
import os
import cv2

UPLOAD_FOLDER = 'uploads'
ALLOWED_EXTENSIONS = {'webp', 'png', 'jpg', 'jpeg', 'gif'}



app = Flask(__name__)
app.secret_key = 'super secret key'
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER

def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

def processImage(filename,operation):
    print(f"the operation is {operation} and filename is{filename}")
    img = cv2.imread(f"uploads/{filename}")
    match operation:
        case "cgray":
            imgProcessed = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
            newFilename = f"static/{filename}"
        case "cwebp":
            newFilename = f"static/{filename.split('.')[0]}.webp"
        case "cjpg":
            newFilename = f"static/{filename.split('.')[0]}.jpg"
        case "cpng":
            newFilename = f"static/{filename.split('.')[0]}.png"
        case "blur":
            imgProcessed = cv2.GaussianBlur(img, (15, 15), 0)
            newFilename = f"static/{filename.split('.')[0]}_blur.jpg"
        case "sharpen":
            kernel = np.array([[0, -1, 0],
                               [-1, 5,-1],
                               [0, -1, 0]])
            imgProcessed = cv2.filter2D(img, -1, kernel)
            newFilename = f"static/{filename.split('.')[0]}_sharpen.jpg"
        case "edge":
            imgProcessed = cv2.Canny(img, 100, 200)
            newFilename = f"static/{filename.split('.')[0]}_edge.jpg"

    if operation in {"cgray", "blur", "sharpen", "edge"}:
        cv2.imwrite(newFilename, imgProcessed)
    else:
        cv2.imwrite(newFilename, img)

    return newFilename

    pass

@app.route("/")
def home():
    return render_template("index.html")

@app.route("/about")
def about():
    return render_template("about.html")

@app.route("/how")
def how():
    return render_template("how.html")

@app.route("/contact")
def contact():
    return render_template("contact.html")


STATIC_FOLDER = 'static'

@app.route('/download/<filename>')
def download(filename):
    path = os.path.join(STATIC_FOLDER, filename)
    return send_file(path, as_attachment=True)

@app.route("/edit", methods=["GET", "POST"])
def edit():
        
    if request.method == 'POST':
        operation = request.form.get("operation")
        # check if the post request has the file part
        if 'file' not in request.files:
            flash('No file part')
            return "Error"
        file = request.files['file']
        # If the user does not select a file, the browser submits an
        # empty file without a filename.
        if file.filename == '':
            flash('No selected file')
            return "Error: No selected File"
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            new = processImage(filename, operation)
            if new:
                flash(f"Your image has been processed and is available <a href='/{new}' target ='_blank'> here</a>")
                return render_template("index.html", new_filename = new)
    

    return render_template("contact.html")




app.run(debug=True , port =5001)