app.py

from app.logger_config import (
    logger as logging,
    DEBUG
) 
import numpy as np
import gradio as gr
import asyncio
from fastrtc.webrtc import WebRTC
from fastrtc.utils import AdditionalOutputs
from pydub import AudioSegment
import time
import os
from gradio.utils import get_space

from app.utils import (
    generate_coturn_config,
    raise_function
)
from app.session_utils import (
    on_load,
    on_unload,
    get_active_sessions,
    register_session,
    reset_all_active_sessions,
)

from app.ui_utils import (
    SUPPORTED_LANGS_MAP,
    EXAMPLE_CONFIGS,
    apply_preset_if_example,
    reset_to_defaults,
    summarize_config,
    handle_additional_outputs,
    get_custom_theme,
    on_file_load
)

from app.stream_utils import (
    read_and_stream_audio,
    stop_streaming
)

# --------------------------------------------------------
# Initialization
# --------------------------------------------------------
reset_all_active_sessions()

theme,css_style = get_custom_theme()

with gr.Blocks(theme=theme, css=css_style) as demo:
    session_hash = gr.State()
    session_hash_box = gr.Textbox(label="Session ID", interactive=False, visible=DEBUG)
    with gr.Accordion("📊 Active Sessions", open=True ,visible=DEBUG):
        sessions_table = gr.DataFrame(
            headers=["session_hash", "file", "start_time", "status"],
            interactive=False,
            wrap=True,
            max_height=200,
        )
        gr.Timer(3.0).tick(fn=get_active_sessions, outputs=sessions_table)

    demo.load(fn=on_load, inputs=None, outputs=[session_hash, session_hash_box])
    demo.unload(on_unload)
    stop_streaming_flags = gr.State(value={"stop": False})
    active_filepath = gr.State(value=next(iter(EXAMPLE_CONFIGS)))

    with gr.Walkthrough(selected=0) as walkthrough:
        # === STEP 1 ===
        with gr.Step("Audio", id=0) as audio_source_step:
            gr.Markdown(
                """
                ### Step 1: Upload or Record an Audio File
                You can upload an existing file or record directly from your microphone.  
                Accepted formats: **.wav**, **.mp3**, **.flac**  
                Maximum length recommended: **60 seconds**
                """
            )

            with gr.Group():
                with gr.Column():
                    main_audio = gr.Audio(
                        label="Audio Input",
                        sources=["upload", "microphone"],
                        type="filepath",
                        interactive=True
                    )

                    with gr.Accordion("Need a quick test? Try one of the sample audios below", open=True):
                        examples = gr.Examples(
                            examples=list(EXAMPLE_CONFIGS.keys()),
                            inputs=main_audio,
                            label=None,
                            examples_per_page=3
                        )
                        gr.Markdown(
                            """
                            🔹 **english_meeting.wav** – Short business meeting in English  
                            🔹 **french_news.wav** – Excerpt from a French radio broadcast  
                            🔹 **spanish_podcast.wav** – Segment from a Spanish-language podcast  
                            """
                        )

            btn = gr.Button("Proceed to Streaming", visible=True)

            # ui_components_one = [active_filepath, btn]
            # main_audio.change(fn=on_file_load, inputs=[main_audio], outputs=ui_components_one)
            # main_audio.stop_recording(fn=on_file_load, inputs=[main_audio], outputs=ui_components_one)
            # main_audio.clear(fn=on_file_load, inputs=[main_audio], outputs=ui_components_one)

            btn.click(lambda: gr.Walkthrough(selected=1), outputs=walkthrough)

         # === STEP 2 ===
        with gr.Step("Stream", id=1) as audio_stream:
            gr.Markdown("### Step 2: Start audio streaming")
            with gr.Group():
                with gr.Column():
                    webrtc_stream = WebRTC(
                        label="Live Stream",
                        mode="receive",
                        modality="audio",
                        rtc_configuration=generate_coturn_config(),
                        visible=True,
                    )
            start_button = gr.Button("Start Streaming")

            webrtc_stream.stream(
                fn=read_and_stream_audio,
                inputs=[active_filepath, session_hash, stop_streaming_flags],
                outputs=[webrtc_stream],
                trigger=start_button.click,
                concurrency_id="audio_stream",
                concurrency_limit=10,
            )

            go_to_config = gr.Button("Go to Configuration", visible=False)
            go_to_config.click(lambda: gr.Walkthrough(selected=2), outputs=walkthrough)

        # === STEP 3 ===
        with gr.Step("Configuration", id=2):
            gr.Markdown("## Step 3: Configure the Task")

            task_type = gr.Radio(["Transcription", "Translation"], value="Transcription", label="Task Type")
            lang_source = gr.Dropdown(list(SUPPORTED_LANGS_MAP.keys()), value="French", label="Source Language")
            lang_target = gr.Dropdown(list(SUPPORTED_LANGS_MAP.keys()), value="English", label="Target Language", visible=False)

            with gr.Accordion("Advanced Configuration", open=False):
                chunk_secs = gr.Number(value=1.0, label="chunk_secs", precision=1)
                left_context_secs = gr.Number(value=20.0, label="left_context_secs", precision=1)
                right_context_secs = gr.Number(value=0.5, label="right_context_secs", precision=1)
                streaming_policy = gr.Dropdown(["waitk", "alignatt"], value="waitk", label="decoding.streaming_policy")
                alignatt_thr = gr.Number(value=8, label="alignatt_thr", precision=0)
                waitk_lagging = gr.Number(value=2, label="waitk_lagging", precision=0)
                exclude_sink_frames = gr.Number(value=8, label="exclude_sink_frames", precision=0)
                xatt_scores_layer = gr.Number(value=-2, label="xatt_scores_layer", precision=0)
                hallucinations_detector = gr.Checkbox(value=True, label="hallucinations_detector")

            with gr.Row():
                auto_apply_presets = gr.Checkbox(value=True, label="Auto-apply presets for sample audios")
                reset_btn = gr.Button("Reset to defaults")

            summary_box = gr.Textbox(label="Configuration Summary", lines=10, interactive=False)

            # --- Events ---
            task_type.change(
                fn=lambda t: gr.update(visible=(t == "Translation")),
                inputs=task_type,
                outputs=lang_target,
                queue=False
            )

            inputs_list = [
                task_type, lang_source, lang_target,
                chunk_secs, left_context_secs, right_context_secs,
                streaming_policy, alignatt_thr, waitk_lagging,
                exclude_sink_frames, xatt_scores_layer, hallucinations_detector
            ]
            for inp in inputs_list:
                inp.change(
                    fn=summarize_config,
                    inputs=inputs_list,
                    outputs=summary_box,
                    queue=False
                )

            # Apply preset or not
            main_audio.change(
                fn=apply_preset_if_example,
                inputs=[main_audio, auto_apply_presets],
                outputs=[
                    task_type, lang_source, lang_target,
                    chunk_secs, left_context_secs, right_context_secs,
                    streaming_policy, alignatt_thr, waitk_lagging,
                    exclude_sink_frames, xatt_scores_layer, hallucinations_detector,
                    summary_box
                ],
                queue=False
            )

            # Reset defaults
            reset_btn.click(
                fn=reset_to_defaults,
                inputs=None,
                outputs=[
                    task_type, lang_source, lang_target,
                    chunk_secs, left_context_secs, right_context_secs,
                    streaming_policy, alignatt_thr, waitk_lagging,
                    exclude_sink_frames, xatt_scores_layer, hallucinations_detector,
                    summary_box
                ],
                queue=False
            )

            go_to_task = gr.Button("Go to Task")
            go_to_task.click(lambda: gr.Walkthrough(selected=3), outputs=walkthrough)

        # === STEP 4 ===
        with gr.Step("Task", id=3) as task_step:
            gr.Markdown("## Step 4: Start the Task")

            with gr.Group():
                with gr.Column():
                    status_slider = gr.Slider(
                        0, 100,
                        value=0,
                        label="Streaming Progress",
                        interactive=False,
                        visible=False
                    )

                    transcription_output = gr.Textbox(
                        label="Transcription / Translation Result",
                        placeholder="The output text will appear here...",
                        lines=10,
                        interactive=False,
                        visible=True
                    )

                    start_task_button = gr.Button("Start Task", visible=True)
                    stop_button = gr.Button("Stop Streaming", visible=False)
                    stop_task_button = gr.Button("Stop Task", visible=False)

                    stop_button.click(
                        fn=stop_streaming,
                        inputs=[session_hash, stop_streaming_flags],
                        outputs=[stop_streaming_flags],
                    )

                    def stop_task_fn():
                        return "Task stopped by user."

                    stop_task_button.click(
                        fn=stop_task_fn,
                        inputs=None,
                        outputs=transcription_output
                    )

                    ui_components = [
                        start_button, stop_button,
                        go_to_config, audio_source_step, status_slider
                    ]

                    webrtc_stream.on_additional_outputs(
                        fn=handle_additional_outputs,
                        outputs=ui_components,
                        concurrency_id="additional_outputs_audio_stream",
                        concurrency_limit=10,
                    )

                    # def start_transcription(
                    #     session_hash, stop_streaming_flags,
                    #     task_type, lang_source, lang_target,
                    #     chunk_secs, left_context_secs, right_context_secs,
                    #     streaming_policy, alignatt_thr, waitk_lagging,
                    #     exclude_sink_frames, xatt_scores_layer, hallucinations_detector
                    # ):
                    #     if task_type == "Translation":
                    #         return f"Translation completed ({lang_source} → {lang_target})\n\nTranslated text:\nLorem ipsum..."
                    #     else:
                    #         return f"Transcription completed ({lang_source})\n\nTranscribed text:\nHello everyone, this is a test audio stream..."

                    # start_task_button.click(
                    #     fn=start_transcription,
                    #     inputs=[
                    #         session_hash, stop_streaming_flags,
                    #         task_type, lang_source, lang_target,
                    #         chunk_secs, left_context_secs, right_context_secs,
                    #         streaming_policy, alignatt_thr, waitk_lagging,
                    #         exclude_sink_frames, xatt_scores_layer, hallucinations_detector
                    #     ],
                    #     outputs=transcription_output
                    # )

                    # def toggle_task_buttons():
                    #     return (
                    #         gr.update(visible=False),
                    #         gr.update(visible=True),
                    #         gr.update(visible=True)
                    #     )

                    # start_task_button.click(
                    #     fn=toggle_task_buttons,
                    #     inputs=None,
                    #     outputs=[start_task_button, stop_task_button, stop_button],
                    #     queue=False
                    # )


if __name__ == "__main__":
    demo.queue(max_size=10, api_open=False).launch(show_api=False, debug=True)