import subprocess

# Install specific version of Gradio
subprocess.run(["pip", "install", "gradio==1.7.7"])
import gradio as gr
import fitz
from PIL import Image

class PDFViewer:
    def __init__(self, pdf_path):
        self.doc = fitz.open(pdf_path)
        self.page_num = 0
        self.selected_area = None

    def display_page(self, page_num):
        self.page_num = page_num
        page = self.doc[self.page_num]
        pix = page.get_pixmap()
        return Image.frombytes("RGB", [pix.width, pix.height], pix.samples)

    def navigate_page(self, direction):
        if direction == "next":
            self.page_num += 1
        elif direction == "previous":
            self.page_num -= 1
        self.page_num = max(0, min(self.page_num, len(self.doc) - 1))
        return self.display_page(self.page_num)

    def select_area(self, start_x, start_y, end_x, end_y):
        selected_area = fitz.Rect(start_x, start_y, end_x, end_y)
        selected_pixmap = self.doc[self.page_num].get_pixmap(matrix=fitz.Matrix(1, 1), clip=selected_area)
        self.selected_area = Image.frombytes("RGB", [selected_pixmap.width, selected_pixmap.height], selected_pixmap.samples)
        return "Area selected"

def main(pdf_file, direction, start_x=None, start_y=None, end_x=None, end_y=None):
    pdf_path = pdf_file.name
    if pdf_path:
        pdf_viewer = PDFViewer(pdf_path)
        if start_x is not None and start_y is not None and end_x is not None and end_y is not None:
            return pdf_viewer.select_area(start_x, start_y, end_x, end_y)
        else:
            return pdf_viewer.navigate_page(direction)

pdf_file = gr.inputs.File(label="Select a PDF file")
direction = gr.inputs.Radio(["previous", "next"], label="Navigation")
coordinates = [gr.inputs.Number(label="Start X"), gr.inputs.Number(label="Start Y"),
               gr.inputs.Number(label="End X"), gr.inputs.Number(label="End Y")]

gr.Interface(fn=main, inputs=[pdf_file, direction, *coordinates], outputs=["image", "text"]).launch()