plot_utils.py

import streamlit as st
import matplotlib.pyplot as plt
import numpy as np
import plotly.graph_objects as go
import cartopy.crs as ccrs

def plot_prithvi_output(out_tensor):
    if out_tensor is None:
        st.warning("No output available for plotting.")
        return

    # Example visualization UI for Prithvi:
    st.markdown("## 📊 Visualization Settings")
    # Extract shape and variable names as needed
    if out_tensor.ndim < 4:
        st.error("The output tensor does not have the expected dimensions.")
        return

    num_variables = out_tensor.shape[1]
    variable_names = [f"Variable_{i}" for i in range(num_variables)]

    col1, col2 = st.columns(2)
    with col1:
        selected_variable_name = st.selectbox(
            "Select Variable to Plot",
            options=variable_names,
            index=0,
            help="Choose the variable to visualize."
        )
        plot_type = st.selectbox("Select Plot Type", ["Contour", "Heatmap"], index=0)

    with col2:
        cmap = st.selectbox("Select Color Map", options=plt.colormaps(), index=plt.colormaps().index("viridis"))
        if plot_type == "Contour":
            num_levels = st.slider("Number of Contour Levels", 5, 100, 20, 5)
        else:
            num_levels = None

    variable_index = variable_names.index(selected_variable_name)
    selected_variable = out_tensor[0, variable_index].cpu().numpy()
    lat = np.linspace(-90, 90, selected_variable.shape[0])
    lon = np.linspace(-180, 180, selected_variable.shape[1])
    X, Y = np.meshgrid(lon, lat)

    st.markdown(f"### Plot of {selected_variable_name}")
    fig, ax = plt.subplots(figsize=(10, 6))
    if plot_type == "Contour":
        contour = ax.contourf(X, Y, selected_variable, levels=num_levels, cmap=cmap)
    else:
        contour = ax.imshow(selected_variable, extent=[-180, 180, -90, 90], cmap=cmap, origin='lower', aspect='auto')

    cbar = plt.colorbar(contour, ax=ax)
    cbar.set_label(f'{selected_variable_name}', fontsize=12)
    ax.set_xlabel("Longitude", fontsize=12)
    ax.set_ylabel("Latitude", fontsize=12)
    ax.set_title(selected_variable_name, fontsize=14)
    st.pyplot(fig)

    # Plotly interactive plot
    st.markdown("#### Interactive Plot")
    if plot_type == "Contour":
        fig_plotly = go.Figure(data=go.Contour(
            z=selected_variable,
            x=lon,
            y=lat,
            colorscale=cmap,
            contours=dict(coloring='fill', showlabels=True, labelfont=dict(size=12, color='white'), ncontours=num_levels)
        ))
    else:
        fig_plotly = go.Figure(data=go.Heatmap(z=selected_variable, x=lon, y=lat, colorscale=cmap))

    fig_plotly.update_layout(
        xaxis_title="Longitude",
        yaxis_title="Latitude",
        width=800,
        height=600,
    )
    st.plotly_chart(fig_plotly)


def plot_aurora_output(preds, ds_subset):
    if preds is None or ds_subset is None:
        st.error("No predictions or dataset subset available for visualization.")
        return

    try:
        levels = preds[0].atmos_vars["t"].shape[2]
    except:
        st.error("Could not determine available levels in the data.")
        return

    selected_level = st.slider('Select Level', 0, levels - 1, 11, 1)

    for idx, pred in enumerate(preds):
        pred_time = pred.metadata.time[0]

        try:
            pred_data = pred.atmos_vars["t"][0][0][selected_level].numpy() - 273.15
            truth_data = ds_subset.T.isel(lev=selected_level)[idx].values - 273.15
        except Exception as e:
            st.error("Error extracting data for plotting:")
            st.error(e)
            continue

        lat = np.array(pred.metadata.lat)
        lon = np.array(pred.metadata.lon)

        fig, axes = plt.subplots(1, 3, figsize=(18, 6), subplot_kw={'projection': ccrs.PlateCarree()})

        # Ground Truth
        im1 = axes[0].imshow(
            truth_data, extent=[lon.min(), lon.max(), lat.min(), lat.max()],
            origin='lower', cmap='coolwarm', transform=ccrs.PlateCarree()
        )
        axes[0].set_title(f"Ground Truth at Level {selected_level} - {pred_time}")
        plt.colorbar(im1, ax=axes[0], orientation='horizontal', pad=0.05)

        # Prediction
        im2 = axes[1].imshow(
            pred_data, extent=[lon.min(), lon.max(), lat.min(), lat.max()],
            origin='lower', cmap='coolwarm', transform=ccrs.PlateCarree()
        )
        axes[1].set_title(f"Prediction at Level {selected_level} - {pred_time}")
        plt.colorbar(im2, ax=axes[1], orientation='horizontal', pad=0.05)

        plt.tight_layout()
        st.pyplot(fig)