"""
ScrAIbe Web GUI (Gradio) - Async Mode
-------------------------------------

Runs the Web GUI that:
- Accepts audio uploads
- Enqueues transcription jobs asynchronously via Celery
- Backend worker:
  - Transcribes (with diarization)
  - Optionally summarizes
  - Emails the user:
    - Immediately: confirmation + queue position
    - On success: transcript + JSON (+ summary if requested)
    - On error: error details

This is the default entrypoint when running in Docker.
"""

import os
import logging
import shutil
from datetime import datetime

import gradio as gr

from .misc import setup_logging

logger = logging.getLogger("scraibe.webui")


def load_config():
    """
    Load configuration from misc/config.yaml if present.
    Primary runtime configuration is via environment variables.
    """
    config_path = os.getenv("SCRAIBE_CONFIG", "/app/src/misc/config.yaml")
    config = {}
    if os.path.exists(config_path):
        try:
            import yaml
            with open(config_path, "r", encoding="utf-8") as f:
                config = yaml.safe_load(f) or {}
        except Exception as e:
            logger.warning("Failed to load config from %s: %s", config_path, e)
    return config


def create_app():
    """
    Create and launch the Gradio Web GUI (async mode).
    """

    # Logging
    log_level = os.getenv("LOG_LEVEL", "INFO")
    setup_logging(level=log_level)

    # Load config (branding, layout, etc.)
    config = load_config()
    layout_cfg = config.get("layout", {})
    launch_cfg = config.get("launch", {})

    logger.info("Starting ScrAIbe Web GUI (async mode).")

    # Ensure upload directory exists
    upload_dir = os.getenv("SCRAIBE_UPLOAD_DIR", "/tmp/scraibe_uploads")
    os.makedirs(upload_dir, exist_ok=True)

    # Load header/footer HTML if present
    header_path = layout_cfg.get("header", "/app/src/misc/header.html")
    footer_path = layout_cfg.get("footer", "/app/src/misc/footer.html")

    header_html = ""
    footer_html = ""

    if header_path and os.path.exists(header_path):
        with open(header_path, "r", encoding="utf-8") as f:
            header_html = f.read()

    if footer_path and os.path.exists(footer_path):
        with open(footer_path, "r", encoding="utf-8") as f:
            footer_html = f.read()

    # Build Gradio interface
    with gr.Blocks(
        title="A.P.Strom Transcription",
    ) as app:

        # Header
        if header_html:
            gr.HTML(header_html)

        with gr.Row():
            with gr.Column(scale=2):
                audio_input = gr.Audio(
                    label="Upload or record audio",
                    type="filepath",
                )

                with gr.Row():
                    task_choice = gr.Radio(
                        choices=[
                            ("Transcribe", "transcribe"),
                            ("Transcript & Summarize", "transcript_and_summarize"),
                        ],
                        value="transcribe",
                        label="Task",
                    )

                with gr.Row():
                    language_input = gr.Textbox(
                        label="Language (optional)",
                        placeholder="e.g., english, german",
                    )
                    num_speakers_input = gr.Number(
                        label="Number of speakers (optional)",
                        precision=0,
                    )

                # Email is required in async mode
                email_to = gr.Textbox(
                    label="Your email address (required)",
                    placeholder="e.g. your.name@example.com",
                )

                email_cc = gr.Textbox(
                    label="CC (optional, comma-separated)",
                    placeholder="e.g. manager@example.com",
                )

                submit_btn = gr.Button("Submit for transcription", variant="primary")

            with gr.Column(scale=3):
                status_text = gr.Textbox(
                    label="Status",
                    lines=6,
                    interactive=False,
                )

        # Footer
        if footer_html:
            gr.HTML(footer_html)

        # Events

        def on_task_change(value):
            # No special UI changes needed; both modes handled in backend
            return

        task_choice.change(
            fn=on_task_change,
            inputs=[task_choice],
            outputs=[],
        )

        def on_submit(
            audio,
            task,
            language,
            num_speakers,
            email_to_val,
            email_cc_val,
        ):
            if not audio:
                return "Please upload or record audio."

            email_to_val = (email_to_val or "").strip()
            if not email_to_val:
                return "Please enter your email address."

            # Copy uploaded file to a stable location
            try:
                ext = os.path.splitext(audio)[1] or ".wav"
                ts = datetime.utcnow().strftime("%Y%m%d%H%M%S%f")
                new_name = f"upload_{ts}{ext}"
                dest_path = os.path.join(upload_dir, new_name)
                shutil.copy2(audio, dest_path)
            except Exception as e:
                logger.error("Error copying uploaded file: %s", e)
                return f"Error saving your file: {e}"

            # Import Celery task
            try:
                from .tasks import process_transcription_task
            except ImportError:
                return (
                    "Error: async processing is not available (Celery not configured)."
                )

            # Enqueue transcription job
            try:
                task_result = process_transcription_task.delay(
                    audio_path=dest_path,
                    task_type=task,
                    language=language or None,
                    num_speakers=int(num_speakers) if num_speakers else None,
                    email_to=email_to_val,
                    email_cc=email_cc_val or None,
                    include_summary=(task == "transcript_and_summarize"),
                )
            except Exception as e:
                logger.error("Error enqueuing job: %s", e)
                return f"Error submitting your file: {e}"

            return (
                "Your audio file has been received and added to the queue.\n"
                "We have sent a confirmation email to you.\n"
                "You will receive another email with your transcript (and summary, if requested) "
                "once processing is complete.\n"
                f"Job ID: {task_result.id}"
            )

        submit_btn.click(
            fn=on_submit,
            inputs=[
                audio_input,
                task_choice,
                language_input,
                num_speakers_input,
                email_to,
                email_cc,
            ],
            outputs=[status_text],
        )

    # Launch options
    server_name = launch_cfg.get("server_name", os.getenv("GRADIO_SERVER_NAME", "0.0.0.0"))
    server_port = launch_cfg.get("server_port", 7860)
    favicon_path = launch_cfg.get("favicon_path", "/app/src/misc/logo.png")

    app.launch(
        server_name=str(server_name),
        server_port=int(server_port),
        favicon_path=favicon_path if os.path.exists(favicon_path) else None,
        css="body { font-family: Arial, sans-serif; }",
    )


if __name__ == "__main__":
    create_app()