import os

import gradio as gr
from datasets import Audio
from datasets import load_dataset
from jiwer import wer, cer
from transformers import pipeline

from arabic_normalizer import ArabicTextNormalizer

# Load dataset
common_voice = load_dataset("mozilla-foundation/common_voice_11_0",trust_remote_code=True, name = "ar", split = "train")
# select column that will be used
common_voice = common_voice.select_columns(["audio", "sentence"])

generate_kwargs = {
    "language": "arabic",
    "task": "transcribe"
}
# Initialize ASR pipeline
asr_whisper_large = pipeline("automatic-speech-recognition", model = "openai/whisper-large-v3", device = 0,
                             generate_kwargs = generate_kwargs)
asr_whisper_large_turbo = pipeline("automatic-speech-recognition", model = "openai/whisper-large-v3-turbo",
                                   device = 0, generate_kwargs = generate_kwargs)
normalizer = ArabicTextNormalizer()


def generate_audio(index = None):
    """Select an audio sample, resample if needed, and transcribe using ASR."""
    # inspect dataset
    # print(common_voice)
    # print(common_voice.features)

    # resample audio using dataset function
    global common_voice
    common_voice = common_voice.cast_column("audio", Audio(sampling_rate = 16000))
    # print(common_voice.features)

    # Randomly shuffle the dataset and pick the first sample
    example = common_voice.shuffle()[0]
    audio = example["audio"]

    # Ground truth transcription (for WER/CER calculations)
    reference_text = normalizer(example["sentence"])

    # Prepare audio data for ASR
    audio_data = {
        "array": audio["array"],
        "sampling_rate": audio["sampling_rate"]
    }

    audio_data_turbo = {
        "raw": audio["array"],
        "sampling_rate": audio["sampling_rate"]
    }

    # Perform automatic speech recognition (ASR) directly on the resampled audio array
    asr_output = asr_whisper_large(audio_data)

    asr_output_turbo = asr_whisper_large_turbo(audio_data_turbo)

    # Extract the transcription from the ASR model output
    predicted_text = normalizer(asr_output["text"])
    predicted_text_turbo = normalizer(asr_output_turbo["text"])

    # Compute WER, Word Accuracy, and CER
    wer_score = wer(reference_text, predicted_text)
    cer_score = cer(reference_text, predicted_text)

    wer_score_turbo = wer(reference_text, predicted_text_turbo)
    cer_score_turbo = cer(reference_text, predicted_text_turbo)

    # Prepare display data: original sentence, sampling rate, ASR transcription, and metrics
    sentence_info = "-".join([reference_text, str(audio["sampling_rate"])])

    return ((
                audio["sampling_rate"],
                audio["array"]
            ), sentence_info, predicted_text, wer_score, cer_score, predicted_text_turbo,
            wer_score_turbo, cer_score_turbo)

def update_ui():
    res = []
    for i in range(4):
        res.append(gr.Textbox(label=f"Label {i}"))
    return res

with (gr.Blocks() as demo):
    gr.HTML("""
        <h1>Whisper Arabic: ASR Comparison (large and large turbo)</h1>""")
    gr.Markdown("""
        This is a demo to compare the outputs, WER & CER of two ASR models (Whisper large and large turbo) using 
        arabic dataset from mozilla-foundation/common_voice_11_0
    """)
    num_samples_input = gr.Slider(minimum=1, maximum=10, step=1, value=4, label="Number of audio samples")
    generate_button = gr.Button("Generate Samples")


    @gr.render(inputs=num_samples_input, triggers=[generate_button.click])
    def render(num_samples):
        with gr.Column():
            for i in range(num_samples):
                # Generate audio and associated data
                _audio, label, asr_text, wer_score, cer_score, asr_text_turbo, wer_score_turbo, cer_score_turbo =generate_audio()

                # Create Gradio components to display the audio, transcription, and metrics
                gr.Audio(_audio, label = label)
                with gr.Row():
                    with gr.Column():
                        gr.Textbox(value = asr_text, label = "Whisper large output"),
                        gr.Textbox(value = f"WER: {wer_score:.2f}", label = "Word Error Rate"),
                        gr.Textbox(value = f"CER: {cer_score:.2f}", label = "Character Error Rate"),
                    with gr.Column():
                        gr.Textbox(value = asr_text_turbo, label = "Whisper large turbo output"),
                        gr.Textbox(value = f"WER: {wer_score_turbo:.2f}", label = "Word Error Rate - "
                                                                                                   "TURBO  "),
                        gr.Textbox(value = f"CER: {cer_score_turbo:.2f}", label = "Character Error "
                                                                                                      "Rate - TURBO")

if __name__ == '__main__':
    demo.launch(show_error = True)