app.py

import json
import os
import time
import gradio as gr
from typing import Dict, Any, Tuple

# Sample prompt templates based on joeygambino/MiniMax-H3-Multishot-Workflow rules
DEFAULT_SHOTS = """[Shot 1] A detective in a dark trenchcoat walks down a dimly lit, rain-slicked alleyway in Neo-Tokyo. Neon signs reflect off the wet asphalt.
---
[Shot 2] The detective stops under a blue neon bar sign, reaches into his coat pocket, and pulls out a brass lighter.
---
[Shot 3] He flicks the lighter open. The flame briefly illuminates his sharp jawline and worn facial expression before a loud thunder crack echoes in the background."""

def parse_shot_script(script_text: str) -> list[str]:
    """Splits multi-shot prompt scripts delimited by '---'."""
    shots = [shot.strip() for shot in script_text.split("---") if shot.strip()]
    return shots if shots else ["A cinematic scene with continuous motion."]

def generate_multishot_video(
    prompts: str,
    resolution: str = "1280x736",
    continuity_mode: str = "first_frame",
    take_seconds: int = 15,
    fps: int = 24,
    steps: int = 30,
) -> Tuple[str, str, Dict[str, Any]]:
    """
    Main function for multi-shot video generation.
    Exposed as an agent-callable API via Gradio.
    """
    shots = parse_shot_script(prompts)
    width, height = map(int, resolution.split("x"))
    
    # Payload structured according to MiniMax-H3-Multishot node spec
    pipeline_payload = {
        "workflow_version": "2.7.0",
        "shots_count": len(shots),
        "shots": shots,
        "master_controls": {
            "width": width,
            "height": height,
            "fps": fps,
            "steps": steps,
            "take_seconds": take_seconds,
            "continuity": continuity_mode,
        }
    }
    
    # Simulated execution pipeline (connects to backend GPU ComfyUI instance/Inference Endpoint)
    time.sleep(2)  # Pipeline latency placeholder
    
    # Summary response
    execution_summary = {
        "status": "success",
        "processed_shots": len(shots),
        "total_duration_sec": take_seconds,
        "resolution": resolution,
        "continuity_applied": continuity_mode,
        "payload": pipeline_payload
    }
    
    # Dummy video path output for demo structure
    output_video = None  # Replace with actual output file path when backend runner is attached
    audio_track = None
    
    return output_video, audio_track, execution_summary


# Gradio UI Design
with gr.Blocks(title="MiniMax-H3 Multi-Shot Studio", theme=gr.themes.Soft()) as demo:
    gr.Markdown(
        """
        # 🎬 MiniMax-H3 Seamless Multi-Shot Studio
        Create continuous, multi-shot video takes with unified audio and character continuity using the **MiniMax-H3-Multishot** workflow.
        """
    )
    
    with gr.Row():
        with gr.Column(scale=2):
            prompts_input = gr.Textbox(
                label="Multi-Shot Script (Separate shots with '---')",
                value=DEFAULT_SHOTS,
                lines=10,
                placeholder="Write Shot 1...\n---\nWrite Shot 2...",
            )
            
            with gr.Accordion("⚙️ Master Controls & Parameters", open=True):
                with gr.Row():
                    resolution_dropdown = gr.Dropdown(
                        choices=["1280x736", "1024x576", "768x512"],
                        value="1280x736",
                        label="Resolution"
                    )
                    continuity_radio = gr.Radio(
                        choices=["first_frame", "context_pin"],
                        value="first_frame",
                        label="Continuity Mode",
                        info="first_frame = zero extra deps | context_pin = latent memory alignment"
                    )
                
                with gr.Row():
                    take_sec_slider = gr.Slider(
                        minimum=5, maximum=60, value=15, step=5, label="Take Duration (Seconds)"
                    )
                    steps_slider = gr.Slider(
                        minimum=15, maximum=50, value=30, step=1, label="Sampling Steps"
                    )

            generate_btn = gr.Button("🚀 Generate Multi-Shot Take", variant="primary")

        with gr.Column(scale=2):
            video_output = gr.Video(label="Generated Master Video")
            audio_output = gr.Audio(label="Master Audio Track")
            status_json = gr.JSON(label="Pipeline Execution & Agent Metadata")

    # Wire up the Gradio button action & API endpoint
    generate_btn.click(
        fn=generate_multishot_video,
        inputs=[
            prompts_input,
            resolution_dropdown,
            continuity_radio,
            take_sec_slider,
            steps_slider
        ],
        outputs=[video_output, audio_output, status_json],
        api_name="generate_multishot_video"  # Exposed for AI Agents
    )

    gr.Markdown(
        """
        ---
        ### 🤖 For AI Agents
        Access the automated `/agents.md` endpoint of this Space or query `/info` to retrieve JSON signatures.
        """
    )

if __name__ == "__main__":
    demo.launch()