import streamlit as st
import os

# Video folder path
VIDEO_FOLDER = "./src/synthda_falling_realreal/"

# Streamlit page setup
st.set_page_config(layout="wide")
st.title("AutoSynthDa Pose Interpolation Viewer")

st.markdown("""
### AutoSynthDa Interpolation Viewer

AutoSynthDa blends two input motion videos to **generate kinematically coherent, synthetic action videos**.
Use the slider below to explore how the system interpolates motion from one video to another.  
Source: [github.com/nvidia/synthda](https://github.com/nvidia/synthda)
""")

# Slider explanation
st.markdown(
    '<p style="text-align:center;"><strong>Use the slider to control the interpolation between Input Video 1 (left) and Input Video 2 (right).</strong></p>',
    unsafe_allow_html=True
)

# Slider (starts at 0.5)
weight = st.slider("Interpolation Weight", 0.0, 1.0, 0.5, step=0.1)

# Filenames
filename_interp = f"videos_generated_{weight:.1f}.mp4"
filename_input1 = "videos_generated_0.0.mp4"
filename_input2 = "videos_generated_1.0.mp4"

# Full paths
video_interp = os.path.join(VIDEO_FOLDER, filename_interp)
video_input1 = os.path.join(VIDEO_FOLDER, filename_input1)
video_input2 = os.path.join(VIDEO_FOLDER, filename_input2)

# File checks
exists_interp = os.path.exists(video_interp)
exists_1 = os.path.exists(video_input1)
exists_2 = os.path.exists(video_input2)

# Interpolation status
if weight == 0.0:
    st.success("Showing Input Video 1 (no interpolation)")
elif weight == 1.0:
    st.success("Showing Input Video 2 (no interpolation)")
else:
    w2 = round(1.0 - weight, 1)
    st.info(
        f"Generated motion: {weight:.1f} from Input Video 1 + {w2:.1f} from Input Video 2"
    )

# Layout: 3 columns for videos
col1, col2, col3 = st.columns(3)

# Helper to show video with autoplay
def render_video_column(col, label, video_path, exists):
    with col:
        st.markdown(f"<div style='text-align: center; font-weight: bold;'>{label}</div>", unsafe_allow_html=True)
        if exists:
            st.markdown(
                f"""
                <video width="100%" autoplay loop muted playsinline>
                    <source src="{video_path}" type="video/mp4">
                    Your browser does not support the video tag.
                </video>
                """,
                unsafe_allow_html=True
            )
        else:
            st.error(f"{label} not found")

# Show videos
render_video_column(col1, "Input Video 1", video_input1, exists_1)
render_video_column(col2, "Interpolated Video", video_interp, exists_interp)
render_video_column(col3, "Input Video 2", video_input2, exists_2)