# -*- coding: utf-8 -*-
"""FinalTRi.ipynb

Automatically generated by Colab.

Original file is located at
    https://colab.research.google.com/drive/1hHv74seqk9eYq4JBX2saCvQZqt6xu8-P
"""

import pandas as pd
import numpy as np
import tensorflow as tf
from tensorflow.keras.preprocessing.text import Tokenizer
from tensorflow.keras.preprocessing.sequence import pad_sequences
from tensorflow.keras.models import Model
from tensorflow.keras.layers import Input, LSTM, Dense, Embedding, AdditiveAttention, Concatenate

import pandas as pd
from sklearn.model_selection import train_test_split
from tensorflow.keras.preprocessing.text import Tokenizer
from tensorflow.keras.preprocessing.sequence import pad_sequences

# Load your dataset with a specific encoding
def load_data(file_path):
    try:
        df = pd.read_csv(file_path, encoding='ISO-8859-1')  # Try 'latin1' or 'utf-16' if needed
    except UnicodeDecodeError:
        print("Error reading the file. Please check the encoding.")
        return [], []
    return df['French'].tolist(), df['Ewondo'].tolist()

# Preprocess the data
def preprocess_data(french_sentences, ewondo_sentences):
    tokenizer_fr = Tokenizer()
    tokenizer_fr.fit_on_texts(french_sentences)
    vocab_size_fr = len(tokenizer_fr.word_index) + 1

    tokenizer_ew = Tokenizer()
    tokenizer_ew.fit_on_texts(ewondo_sentences)
    vocab_size_ew = len(tokenizer_ew.word_index) + 1

    # Convert sentences to sequences
    fr_sequences = tokenizer_fr.texts_to_sequences(french_sentences)
    ew_sequences = tokenizer_ew.texts_to_sequences(ewondo_sentences)

    # Pad sequences
    max_length_fr = max(len(seq) for seq in fr_sequences)
    max_length_ew = max(len(seq) for seq in ew_sequences)

    fr_sequences = pad_sequences(fr_sequences, maxlen=max_length_fr, padding='post')
    ew_sequences = pad_sequences(ew_sequences, maxlen=max_length_ew, padding='post')

    return fr_sequences, ew_sequences, vocab_size_fr, vocab_size_ew, max_length_fr, max_length_ew

# Load and preprocess the data
french_sentences, ewondo_sentences = load_data('french_ewondo_dictionary.csv')
if french_sentences and ewondo_sentences:
    fr_sequences, ew_sequences, vocab_size_fr, vocab_size_ew, max_length_fr, max_length_ew = preprocess_data(french_sentences, ewondo_sentences)

from tensorflow.keras.models import Model
from tensorflow.keras.layers import Input, LSTM, Embedding, Dense

def create_model(vocab_size_fr, vocab_size_ew, max_length_fr, max_length_ew):
    # Encoder
    encoder_inputs = Input(shape=(max_length_fr,))
    encoder_embedding = Embedding(vocab_size_fr, 256)(encoder_inputs)
    encoder_lstm = LSTM(256, return_sequences=True, return_state=True)
    encoder_outputs, state_h, state_c = encoder_lstm(encoder_embedding)
    encoder_states = [state_h, state_c]

    # Decoder
    decoder_inputs = Input(shape=(max_length_ew,))
    decoder_embedding = Embedding(vocab_size_ew, 256)(decoder_inputs)
    decoder_lstm = LSTM(256, return_sequences=True, return_state=True)
    decoder_outputs, _, _ = decoder_lstm(decoder_embedding, initial_state=encoder_states)
    decoder_dense = Dense(vocab_size_ew, activation='softmax')
    decoder_outputs = decoder_dense(decoder_outputs)

    # Define the model
    model = Model([encoder_inputs, decoder_inputs], decoder_outputs)
    return model

model = create_model(vocab_size_fr, vocab_size_ew, max_length_fr, max_length_ew)
model.compile(optimizer='adam', loss='sparse_categorical_crossentropy', metrics=['accuracy'])

import numpy as np

# Shift the Ewondo sequences for decoder input
decoder_input_data = np.zeros_like(ew_sequences)
decoder_input_data[:, 1:] = ew_sequences[:, :-1]  # Shifted sequence
decoder_input_data[:, 0] = 1  # Assuming '1' is the start token

# Train-test split
X_train_fr, X_test_fr, y_train, y_test = train_test_split(fr_sequences, decoder_input_data, test_size=0.2)

# Fit the model
model.fit([X_train_fr, y_train], np.expand_dims(y_train, -1),
          batch_size=64,
          epochs=30,
          validation_split=0.2)

loss, accuracy = model.evaluate([X_test_fr, y_test], np.expand_dims(y_test, -1))
print(f'Test Loss: {loss}, Test Accuracy: {accuracy}')

# Save the model
model.save('french_ewondo_translation_model.h5')  # You can choose a different name

def preprocess_input_sentence(sentence, word_to_index, max_length):
    # Tokenize the sentence
    tokens = sentence.split()
    token_indices = [word_to_index.get(word, 0) for word in tokens]  # 0 for unknown words
    # Pad the sequence
    padded_sequence = pad_sequences([token_indices], maxlen=max_length, padding='post')
    return padded_sequence

def predict_translation(sentence, model, word_to_index_fr, index_to_word_ew, max_length_ew):
    # Preprocess the input sentence
    input_sequence = preprocess_input_sentence(sentence, word_to_index_fr, max_length_fr)

    # Prepare the decoder input with the start token (assumed to be 1)
    start_token = 1  # Assuming 1 is the start token
    decoder_input = np.zeros((1, max_length_ew))
    decoder_input[0, 0] = start_token

    # Generate predictions
    for i in range(1, max_length_ew):
        # Predict the next word
        output_tokens = model.predict([input_sequence, decoder_input])
        sampled_token_index = np.argmax(output_tokens[0, i-1, :])  # Get the most likely word
        decoder_input[0, i] = sampled_token_index  # Add to the decoder input

        # Stop if the end token is predicted (assumed to be 2)
        if sampled_token_index == 2:  # Assuming 2 is the end token
            break

    # Convert indices to Ewondo words
    translated_sentence = ' '.join([index_to_word_ew.get(index, '') for index in decoder_input.flatten() if index > 0])

    return translated_sentence

import pandas as pd
from keras.models import load_model

# Load your trained model
model = load_model('french_ewondo_translation_model.h5')  # Change to your model's path

# Load the French-Ewondo dictionary with the specified encoding
dictionary = pd.read_csv('french_ewondo_dictionary.csv', encoding='ISO-8859-1')
french_to_ewondo = dict(zip(dictionary['French'], dictionary['Ewondo']))

def predict_translation(sentence):
    # Split the sentence into words
    words = sentence.split()
    ewondo_words = []

    for word in words:
        # Get the translation from the dictionary
        ewondo_word = french_to_ewondo.get(word.strip(",.!?;:\"'()[]"), word)  # Default to the original word if not found
        ewondo_words.append(ewondo_word)

    return ' '.join(ewondo_words)

# Example usage
french_sentence = "je suis Noa"  # Replace with your input sentence
ewondo_translation = predict_translation(french_sentence)

print("Ewondo Translation:", ewondo_translation)

model.summary()