import tkinter as tk
from tkinter import filedialog
from PIL import Image, ImageTk, ImageEnhance, ImageOps


class ImageApp:
    def __init__(self, root):
        self.root = root
        self.root.title("Image Viewer")

        self.canvas_width = 800  # Increased canvas width
        self.canvas_height = 600  # Increased canvas height
        self.canvas = tk.Canvas(root, width=self.canvas_width, height=self.canvas_height)
        self.canvas.pack()

        self.btn_frame = tk.Frame(root)
        self.btn_frame.pack()

        self.load_button = tk.Button(self.btn_frame, text="Load Image", command=self.load_image)
        self.load_button.grid(row=0, column=0)

        self.gray_button = tk.Button(self.btn_frame, text="Grayscale", command=self.to_grayscale)
        self.gray_button.grid(row=0, column=1)

        self.dark_button = tk.Button(self.btn_frame, text="Darken", command=self.darken_image)
        self.dark_button.grid(row=0, column=2)

        self.bright_button = tk.Button(self.btn_frame, text="Brighten", command=self.brighten_image)
        self.bright_button.grid(row=0, column=3)

        self.original_image = None  # Store the original image
        self.displayed_image = None  # Store the currently displayed image

    def load_image(self):
        self.image_path = filedialog.askopenfilename()
        if self.image_path:
            self.original_image = Image.open(self.image_path)  # Load original image
            self.displayed_image = self.original_image.copy()  # Initialize displayed image
            self.display_image(self.displayed_image)

    def display_image(self, img):
        # Resize the image to fit the canvas
        img = img.resize((self.canvas_width, self.canvas_height), Image.LANCZOS)
        self.tk_image = ImageTk.PhotoImage(img)
        self.canvas.create_image(0, 0, image=self.tk_image, anchor=tk.NW)

    def to_grayscale(self):
        if self.displayed_image:
            gray_image = ImageOps.grayscale(self.displayed_image)
            self.displayed_image = gray_image  # Update displayed image
            self.display_image(gray_image)

    def darken_image(self):
        if self.displayed_image:
            enhancer = ImageEnhance.Brightness(self.displayed_image)
            dark_image = enhancer.enhance(0.5)  # 50% darker
            self.displayed_image = dark_image  # Update displayed image
            self.display_image(dark_image)

    def brighten_image(self):
        if self.displayed_image:
            enhancer = ImageEnhance.Brightness(self.displayed_image)
            bright_image = enhancer.enhance(1.5)  # 50% brighter
            self.displayed_image = bright_image  # Update displayed image
            self.display_image(bright_image)


if __name__ == "__main__":
    root = tk.Tk()
    app = ImageApp(root)
    root.mainloop()