#!/usr/bin/env python

from __future__ import annotations

import os

import gradio as gr
import torch

from inference import InferencePipeline


class InferenceUtil:
    def __init__(self, hf_token: str | None):
        self.hf_token = hf_token

    def load_model_info(self, model_id: str) -> tuple[str, str]:
        try:
            card = InferencePipeline.get_model_card(model_id, self.hf_token)
        except Exception:
            return "", ""
        base_model = getattr(card.data, "base_model", "")
        training_prompt = getattr(card.data, "training_prompt", "")
        return base_model, training_prompt


DESCRIPTION = "# [Tune-A-Video](https://tuneavideo.github.io/)"
if not torch.cuda.is_available():
    DESCRIPTION += "\n<p>Running on CPU 🥶 This demo does not work on CPU.</p>"

CACHE_EXAMPLES = torch.cuda.is_available() and os.getenv("CACHE_EXAMPLES") == "1"

HF_TOKEN = os.getenv("HF_TOKEN")
pipe = InferencePipeline(HF_TOKEN)
app = InferenceUtil(HF_TOKEN)

with gr.Blocks(css="style.css") as demo:
    gr.Markdown(DESCRIPTION)
    gr.DuplicateButton(
        value="Duplicate Space for private use",
        elem_id="duplicate-button",
        visible=os.getenv("SHOW_DUPLICATE_BUTTON") == "1",
    )

    with gr.Row():
        with gr.Column():
            with gr.Box():
                model_id = gr.Dropdown(
                    label="Model ID",
                    choices=[
                        "Tune-A-Video-library/a-man-is-surfing",
                        "Tune-A-Video-library/mo-di-bear-guitar",
                        "Tune-A-Video-library/redshift-man-skiing",
                    ],
                    value="Tune-A-Video-library/a-man-is-surfing",
                )
                with gr.Accordion(label="Model info (Base model and prompt used for training)", open=False):
                    with gr.Row():
                        base_model_used_for_training = gr.Text(label="Base model", interactive=False)
                        prompt_used_for_training = gr.Text(label="Training prompt", interactive=False)
            prompt = gr.Textbox(label="Prompt", max_lines=1, placeholder='Example: "A panda is surfing"')
            video_length = gr.Slider(label="Video length", minimum=4, maximum=12, step=1, value=8)
            fps = gr.Slider(label="FPS", minimum=1, maximum=12, step=1, value=1)
            seed = gr.Slider(label="Seed", minimum=0, maximum=100000, step=1, value=0)
            with gr.Accordion("Other Parameters", open=False):
                num_steps = gr.Slider(label="Number of Steps", minimum=0, maximum=100, step=1, value=50)
                guidance_scale = gr.Slider(label="CFG Scale", minimum=0, maximum=50, step=0.1, value=7.5)

            run_button = gr.Button("Generate")

            gr.Markdown(
                """
            - It takes a few minutes to download model first.
            - Expected time to generate an 8-frame video: 70 seconds with T4, 24 seconds with A10G, (10 seconds with A100)
            """
            )
        with gr.Column():
            result = gr.Video(label="Result")
    with gr.Row():
        examples = [
            [
                "Tune-A-Video-library/a-man-is-surfing",
                "A panda is surfing.",
                8,
                1,
                3,
                50,
                7.5,
            ],
            [
                "Tune-A-Video-library/a-man-is-surfing",
                "A racoon is surfing, cartoon style.",
                8,
                1,
                3,
                50,
                7.5,
            ],
            [
                "Tune-A-Video-library/mo-di-bear-guitar",
                "a handsome prince is playing guitar, modern disney style.",
                8,
                1,
                123,
                50,
                7.5,
            ],
            [
                "Tune-A-Video-library/mo-di-bear-guitar",
                "a magical princess is playing guitar, modern disney style.",
                8,
                1,
                123,
                50,
                7.5,
            ],
            [
                "Tune-A-Video-library/mo-di-bear-guitar",
                "a rabbit is playing guitar, modern disney style.",
                8,
                1,
                123,
                50,
                7.5,
            ],
            [
                "Tune-A-Video-library/mo-di-bear-guitar",
                "a baby is playing guitar, modern disney style.",
                8,
                1,
                123,
                50,
                7.5,
            ],
            [
                "Tune-A-Video-library/redshift-man-skiing",
                "(redshift style) spider man is skiing.",
                8,
                1,
                123,
                50,
                7.5,
            ],
            [
                "Tune-A-Video-library/redshift-man-skiing",
                "(redshift style) black widow is skiing.",
                8,
                1,
                123,
                50,
                7.5,
            ],
            [
                "Tune-A-Video-library/redshift-man-skiing",
                "(redshift style) batman is skiing.",
                8,
                1,
                123,
                50,
                7.5,
            ],
            [
                "Tune-A-Video-library/redshift-man-skiing",
                "(redshift style) hulk is skiing.",
                8,
                1,
                123,
                50,
                7.5,
            ],
        ]
        gr.Examples(
            examples=examples,
            inputs=[
                model_id,
                prompt,
                video_length,
                fps,
                seed,
                num_steps,
                guidance_scale,
            ],
            outputs=result,
            fn=pipe.run,
            cache_examples=CACHE_EXAMPLES,
        )

    model_id.change(
        fn=app.load_model_info,
        inputs=model_id,
        outputs=[
            base_model_used_for_training,
            prompt_used_for_training,
        ],
        api_name=False,
    )
    inputs = [
        model_id,
        prompt,
        video_length,
        fps,
        seed,
        num_steps,
        guidance_scale,
    ]
    prompt.submit(
        fn=pipe.run,
        inputs=inputs,
        outputs=result,
        api_name=False,
    )
    run_button.click(
        fn=pipe.run,
        inputs=inputs,
        outputs=result,
        api_name="run",
    )

if __name__ == "__main__":
    demo.queue(max_size=20).launch()