import gradio as gr
import cv2
from geti_sdk.deployment import Deployment
from geti_sdk.utils import show_image_with_annotation_scene
import numpy as np
from urllib.request import urlopen
import re

# Step 1: Load the deployment
deployment = Deployment.from_folder("deployment")
deployment.load_inference_models(device="CPU")


def is_valid_url(url):
    pattern = r'^(https?|ftp)://[^\s/$.?#].[^\s]*$'
    return re.match(pattern, url) is not None


def resize_image(image, target_dimension):
    height, width = image.shape[:2]
    max_dimension = max(height, width)
    scale_factor = target_dimension / max_dimension
    new_width = int(width * scale_factor)
    new_height = int(height * scale_factor)
    resized_image = cv2.resize(image, (new_width, new_height))
    return resized_image


def infer(image=None, url:str=None):
    if image is None and url is None:
        return [None,'Error: No image or URL provided']

    if image is None:
        if isinstance(url, str):

            if not is_valid_url(url):
                return [None,'Error: URL appears to be invalid']

            req = urlopen(url)
            arr = np.asarray(bytearray(req.read()), dtype=np.uint8)
            image = cv2.imdecode(arr, -1)
            if image is None:
                return [None, f'Error: Unable to fetch image from {url}']
            image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
    
    image = resize_image(image, 1200)

    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
    prediction = deployment.infer(image)
    output = show_image_with_annotation_scene(image, prediction, show_results=False)
    output = cv2.cvtColor(output, cv2.COLOR_BGR2RGB)
    return [output, prediction.overview]


interface = gr.Interface(fn=infer, 
             inputs=['image', 'text'],
             outputs=['image','text'],
             allow_flagging='manual',
             flagging_dir='flagged',
             examples=[["eggsample1.jpg", ""],
                       ["eggsample2.jpg",""],
                       [None,"https://upload.wikimedia.org/wikipedia/commons/f/f9/Eastern_Phoebe-nest-Brown-headed-Cowbird-egg.jpg"],
                       [None,"https://upload.wikimedia.org/wikipedia/commons/7/72/White-breasted_Woodswallow_chicks_in_nest.jpg"],
                      ])

interface.launch()