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_v7"

def Paddle():
    ocr = PaddleOCR(use_angle_cls=False,lang='fr',rec=False)
    return ocr

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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


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):
    ocr = Paddle()
    image_array = np.array(image)
    width, height = image.size
    results = ocr.ocr(image_array,  cls=False,rec = 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),
     ]

def drop_null_bbox(dictionary):
    keys_to_drop = []
    for key, (_, _, bbox_values) in dictionary.items():
        if all(value == 0.0 for value in bbox_values):
            keys_to_drop.append(key)
    for key in keys_to_drop:
        del dictionary[key]

def get_word(bboxes,image):
    ocr = Paddle()
    x_min, y_min, x_max, y_max = bboxes
    roi = image.crop((x_min, y_min, x_max, y_max)) # Region of intrest
    roi_np = np.array(roi) # To array
    result = ocr.ocr(roi_np, cls=False,det = False,rec = True)
    if result != [None]:
        return result[0][0][0]
    else :
        return ""
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def get_Finale_results(offset_mapping,id2label,image,prediction_scores,predictions,token_boxes):
    width, height = image.size
    is_subword = np.array(offset_mapping.squeeze().tolist())[:,0] != 0
    # Filter out subword tokens and extract true predictions and scores
    true_predictions_with_scores = [(idx,id2label[pred], score[pred],unnormalize_box(box, width, height)) for idx, (pred, score,box) in enumerate(zip(predictions, prediction_scores,token_boxes)) if not is_subword[idx]]
    Final_prediction = [pred for pred in true_predictions_with_scores if pred[1] != "Autre"]
    # Create a dictionary to store the highest score for each prediction
    Final_results = {}
    # Eliminete Duplication of Predictions
    for index, prediction, score, bbox in Final_prediction:
        if prediction not in Final_results or score > Final_results[prediction][1]:
            Final_results[prediction] = (index, score,bbox)
    drop_null_bbox(Final_results)
    
    for final in Final_results:
        Kalma = get_word(Final_results[final][2],image)
        New_tuple = (Kalma,Final_results[final][1],Final_results[final][2])
        Final_results[final] = New_tuple
    
    return Final_results

def Run_model(image):
    encoding,offset_mapping,_ = 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)
    
    prediction_scores = outputs.logits.softmax(-1).squeeze().tolist()
    predictions = outputs.logits.argmax(-1).squeeze().tolist()
    token_boxes = encoding.bbox.squeeze().tolist()
    id2label, _ = Labels()
    Finale_results=get_Finale_results(offset_mapping,id2label,image,prediction_scores,predictions,token_boxes)
    return Finale_results
    
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def Get_Json(Finale_results):
    Results = {}
    for prd in Finale_results:
        if prd in ['InvNum','Fourni', 'InvDate','TT','TTC','TVA']:
            Results[prd] = Finale_results[prd][0]
    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,1.3,1.7)
    Finale_results = 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 result in Finale_results:
        predicted_label = result
        box = Finale_results[result][2]
        color = label2color[result]
        draw.rectangle(box, outline=color, width=rectangle_thickness)
        #print(box)
        # 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)
    
    Results = Get_Json(Finale_results)
    end_time = time.time() 
    execution_time = end_time - start_time 
    
    return image,Results,execution_time


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