import streamlit as st
from paddleocr import PaddleOCR
from PIL import ImageDraw, ImageFont,ImageEnhance
import torch
from transformers import AutoProcessor,LayoutLMv3ForTokenClassification
import numpy as np
import time

model_Hugging_path = "Noureddinesa/Output_LayoutLMv3_v6"


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def Labels():
    labels = ['InvNum', 'InvDate', 'Fourni', 'TTC', 'TVA', 'TT', 'Autre']
    id2label = {v: k for v, k in enumerate(labels)}
    label2id = {k: v for v, k in enumerate(labels)}
    return id2label, label2id
  
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def Paddle():
    ocr = PaddleOCR(use_angle_cls=False,lang='fr',rec=False)
    return ocr

def processbbox(BBOX, width, height):
    bbox = []
    bbox.append(BBOX[0][0])
    bbox.append(BBOX[0][1])
    bbox.append(BBOX[2][0])
    bbox.append(BBOX[2][1])
    #Scaling
    bbox[0]= 1000*bbox[0]/width # X1
    bbox[1]= 1000*bbox[1]/height # Y1
    bbox[2]= 1000*bbox[2]/width # X2
    bbox[3]= 1000*bbox[3]/height # Y2
    for i in range(4):
        bbox[i] = int(bbox[i])
    return bbox


def Preprocess(image):
    image_array = np.array(image)
    ocr = Paddle()
    width, height = image.size
    results = ocr.ocr(image_array, cls=True)
    results = results[0]
    test_dict = {'image': image ,'tokens':[], "bboxes":[]}
    for item in results :
       bbox = processbbox(item[0], width, height)
       test_dict['tokens'].append(item[1][0])
       test_dict['bboxes'].append(bbox)

    print(test_dict['bboxes'])
    print(test_dict['tokens'])
    return test_dict

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def Encode(image):
    example = Preprocess(image)
    image = example["image"]
    words = example["tokens"]
    boxes = example["bboxes"]
    processor = AutoProcessor.from_pretrained(model_Hugging_path, apply_ocr=False)
    encoding = processor(image, words, boxes=boxes,return_offsets_mapping=True,truncation=True, max_length=512, padding="max_length", return_tensors="pt")
    offset_mapping = encoding.pop('offset_mapping')
    return encoding, offset_mapping,words
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def unnormalize_box(bbox, width, height):
     return [
         width * (bbox[0] / 1000),
         height * (bbox[1] / 1000),
         width * (bbox[2] / 1000),
         height * (bbox[3] / 1000),
     ]
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def Run_model(image):
    encoding,offset_mapping,words = Encode(image)
    device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
    # load the fine-tuned model from the hub
    model = LayoutLMv3ForTokenClassification.from_pretrained(model_Hugging_path)
    model.to(device)
    # forward pass
    outputs = model(**encoding)
    
    predictions = outputs.logits.argmax(-1).squeeze().tolist()
    token_boxes = encoding.bbox.squeeze().tolist()
    
    width, height = image.size
    
    id2label, _  = Labels()
    is_subword = np.array(offset_mapping.squeeze().tolist())[:,0] != 0
    true_predictions = [id2label[pred] for idx, pred in enumerate(predictions) if not is_subword[idx]]
    true_boxes = [unnormalize_box(box, width, height) for idx, box in enumerate(token_boxes) if not is_subword[idx]]
    return true_predictions,true_boxes,words

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def Get_Json(true_predictions,words):
    Results = {}
    i = 0
    for prd in true_predictions:
        if prd in ['InvNum','Fourni', 'InvDate','TT','TTC','TVA']:
                #print(i,prd,words[i-1])
                Results[prd] = words[i-1]
        i+=1
    key_mapping = {'InvNum':'Numéro de facture','Fourni':'Fournisseur', 'InvDate':'Date Facture','TT':'Total HT','TTC':'Total TTC','TVA':'TVA'}
    Results = {key_mapping.get(key, key): value for key, value in Results.items()}
    return Results
      
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def Draw(image):
    start_time = time.time()
    
    image = enhance_image(image,1.3,1.5)
    true_predictions, true_boxes,words = Run_model(image)
    draw = ImageDraw.Draw(image)

    label2color = {
        'InvNum': 'blue',
        'InvDate': 'green',
        'Fourni': 'orange',
        'TTC':'purple',
        'TVA': 'magenta',
        'TT': 'red',
        'Autre': 'black'
    }

    # Adjust the thickness of the rectangle outline and label text position
    rectangle_thickness = 4
    label_x_offset = 20
    label_y_offset = -30

    # Custom font size
    custom_font_size = 25

    # Load a font with the custom size
    font_path = "arial.ttf"  # Specify the path to your font file
    custom_font = ImageFont.truetype(font_path, custom_font_size)

    for prediction, box in zip(true_predictions, true_boxes):
        predicted_label = prediction
        # Check if the predicted label exists in the label2color dictionary
        if predicted_label in label2color:
            color = label2color[predicted_label]
        else:
            color = 'black'  # Default color if label is not found
        if predicted_label != "Autre":
            draw.rectangle(box, outline=color, width=rectangle_thickness)
            # Draw text using the custom font and size
            draw.rectangle((box[0], box[1]+ label_y_offset,box[2],box[3]+ label_y_offset), fill=color)
            draw.text((box[0] + label_x_offset, box[1] + label_y_offset), text=predicted_label, fill='white', font=custom_font)
    
    # Get the Results Json File 
    Results = Get_Json(true_predictions,words)
    
    end_time = time.time() 
    execution_time = end_time - start_time 
    
    return image,Results,execution_time

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def Add_Results(data):
    # Render the table
    for key, value in data.items():
        data[key] = st.sidebar.text_input(key, value)
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def check_if_changed(original_values, updated_values):
    for key, value in original_values.items():
        if updated_values[key] != value:
            return True
    return False
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def Update(Results):
    New_results = {}

    if "Fournisseur" in Results.keys():
        text_fourni = st.sidebar.text_input("Fournisseur", value=Results["Fournisseur"])
        New_results["Fournisseur"] = text_fourni
        
    if "Date Facture" in Results.keys():
        text_InvDate = st.sidebar.text_input("Date Facture", value=Results["Date Facture"])
        New_results["Date Facture"] = text_InvDate
        
    if "Numéro de facture" in Results.keys():
        text_InvNum = st.sidebar.text_input("Numéro de facture", value=Results["Numéro de facture"])
        New_results["Numéro de facture"] = text_InvNum
        
    if "Total HT" in Results.keys():
        text_TT = st.sidebar.text_input("Total HT", value=Results["Total HT"])
        New_results["Total HT"] = text_TT
        
    if "TVA" in Results.keys():
        text_TVA = st.sidebar.text_input("TVA", value=Results["TVA"])
        New_results["TVA"] = text_TVA
        
    if "Total TTC" in Results.keys():
        text_TTC = st.sidebar.text_input("TTC", value=Results["Total TTC"])
        New_results["Total TTC"] = text_TTC
    return New_results

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def Change_Image(image1,image2):
        # Initialize session state
        if 'current_image' not in st.session_state:
            st.session_state.current_image = 'image1'

        # Button to switch between images
        if st.sidebar.button('Switcher'):
            if st.session_state.current_image == 'image1':
                st.session_state.current_image = 'image2'
            else:
                st.session_state.current_image = 'image1'
        # Display the selected image
        if st.session_state.current_image == 'image1':
            st.image(image1, caption='Output', use_column_width=True)
        else:
            st.image(image2, caption='Image initiale', use_column_width=True)
            
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def enhance_image(image,brightness_factor, contrast_factor):
    enhancer = ImageEnhance.Brightness(image)
    brightened_image = enhancer.enhance(brightness_factor)
    enhancer = ImageEnhance.Contrast(brightened_image)
    enhanced_image = enhancer.enhance(contrast_factor)
    return enhanced_image