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import gradio as gr
import torch
import numpy as np
import os
from PIL import Image


class DynamicsVisualizer:

    def __init__(self):
        device = torch.device("cpu")
        self.device = device

        self.width = 640
        self.height = 480

        self.vis_cam_id = 1
        self.bg_id = 0  # 0: black, 1: white

        self.imgs = None
        self.gs_orig = None
        self.gs_pred = None
        self.actions = None
        self.videos = None

        self.example_name = None
        self.action_name = None

        self.form_image_is_set = False
        self.form_video_is_set = False
        self.form_3dgs_orig_is_set = False
        self.form_3dgs_pred_is_set = False

    def load_example(self):
        example_path = os.path.join('data', self.example_name)

        self.imgs = [Image.open(os.path.join(example_path, f'img_{i}.png')) for i in range(4)]
        self.gs_orig = os.path.join(example_path, 'gs_orig.splat')
    
    def load_action(self):
        action_path = os.path.join('data', self.action_name)

        self.imgs = [Image.open(os.path.join(action_path, f'img_{i}.png')) for i in range(4)]
        self.videos = [os.path.join(action_path, f'video_{i}.mp4') for i in range(4)]
        self.gs_pred = os.path.join(action_path, 'gs_pred.splat')

    def reset(self):
        self.imgs = None
        self.gs_orig = None
        self.gs_pred = None
        self.actions = None
        self.videos = None
        self.vis_cam_id = 1
        self.bg_id = 0  # 0: black, 1: white
        self.example_name = None
        self.action_name = None
        form_image = gr.Image(label='Initial state and actions', value=None, width=self.width, height=self.height)
        form_video = gr.Video(label='Predicted video', value=None, width=self.width, height=self.height)
        form_3dgs_orig = gr.Model3D(label='Original Gaussian Splats', value=None)
        form_3dgs_pred = gr.Model3D(label='Predicted Gaussian Splats', value=None)
        self.form_image_is_set = False
        self.form_video_is_set = False
        self.form_3dgs_orig_is_set = False
        self.form_3dgs_pred_is_set = False
        return form_image, form_video, form_3dgs_orig, form_3dgs_pred

    def on_click_set_example(self, state):
        self.example_name = f"{int(state['example_id'])}"
        self.load_example()

        init_image = self.imgs[self.vis_cam_id]
        form_image = gr.Image(label='Initial state and actions', value=init_image, width=self.width, height=self.height)
        
        form_video = gr.Video(label='Predicted video', value=None, width=self.width, height=self.height)
        form_3dgs_orig = gr.Model3D(label='Original Gaussian Splats', value=self.gs_orig, clear_color=[self.bg_id, self.bg_id, self.bg_id, 0])
        form_3dgs_pred = gr.Model3D(label='Predicted Gaussian Splats', value=None)

        self.form_image_is_set = True
        self.form_video_is_set = False
        self.form_3dgs_orig_is_set = True
        self.form_3dgs_pred_is_set = False
        
        return form_image, form_video, form_3dgs_orig, form_3dgs_pred
    
    def on_click_set_action(self, state):
        self.action_name = f"{self.example_name}/action-{int(state['action_id'])}"
        self.load_action()

        action_image = self.imgs[self.vis_cam_id]
        form_image = gr.Image(label='Initial state and actions', value=action_image, width=self.width, height=self.height)
        self.form_image_is_set = True

        return form_image

    def on_click_run(self):
        form_video = gr.Video(label='Predicted video', value=self.videos[self.vis_cam_id], width=self.width, height=self.height)
        form_3dgs_pred = gr.Model3D(label='Predicted Gaussian Splats', value=self.gs_pred, clear_color=[self.bg_id, self.bg_id, self.bg_id, 0])
        self.form_video_is_set = True
        self.form_3dgs_pred_is_set = True

        return form_video, form_3dgs_pred

    def on_click_change_view(self, state):
        self.vis_cam_id = int(state['view_id'])
        form_image = gr.Image(label='Initial state and actions', value=self.imgs[self.vis_cam_id], width=self.width, height=self.height)
        if self.form_video_is_set:
            form_video = gr.Video(label='Predicted video', value=self.videos[self.vis_cam_id], width=self.width, height=self.height)
        else:
            form_video = gr.Video(label='Predicted video', value=None, width=self.width, height=self.height)
        return form_image, form_video
    
    # def on_click_change_bg(self):
    #     if self.bg_id == 0:
    #         self.bg_id = 1
    #     else:
    #         self.bg_id = 0
    
    #     if self.form_3dgs_orig_is_set:
    #         form_3dgs_orig = gr.Model3D(value=self.gs_orig, clear_color=[self.bg_id, self.bg_id, self.bg_id, 0])
    #     else:
    #         form_3dgs_orig = gr.Model3D(value=None)
        
    #     if self.form_3dgs_pred_is_set:
    #         form_3dgs_pred = gr.Model3D(value=self.gs_pred, clear_color=[self.bg_id, self.bg_id, self.bg_id, 0])
    #     else:
    #         form_3dgs_pred = gr.Model3D(value=None)

    #     return form_3dgs_orig, form_3dgs_pred

    def launch(self, share=False):
        with gr.Blocks() as app:

            # with gr.Row():
            #     with gr.Column(scale=2):
            #         run_reset = gr.Button('Clear All')

            #     with gr.Column(scale=2):
            #         run_set_example = gr.Button('Set Example')

            #     with gr.Column(scale=2):
            #         run_set_action = gr.Button('Set Action')

            #     with gr.Column(scale=2):
            #         run_run = gr.Button('Run')

            # with gr.Row():
            #     with gr.Column(scale=1, min_width=20):
            #         with gr.Row():
            #             run_view_0 = gr.Button('View 0')
                    
            #         with gr.Row():
            #             run_view_1 = gr.Button('View 1')
                    
            #         with gr.Row():
            #             run_view_2 = gr.Button('View 2')
                    
            #         with gr.Row():
            #             run_view_3 = gr.Button('View 3')

            with gr.Row():
                gr.Markdown("# Dynamic 3D Gaussian Tracking for Graph-Based Neural Dynamics Modeling")
            
            with gr.Row():
                gr.Markdown('Project page: [https://gs-dynamics.github.io/](https://gs-dynamics.github.io/)')
            
            with gr.Row():
                gr.Markdown()
            
            with gr.Row():
                gr.Markdown()

            with gr.Row():
                with gr.Column(scale=1):
                    gr.Markdown("**Step 0**: click **Clear All** to clear all window and reset the visualizer.")
                
                with gr.Column(scale=1):
                    run_reset = gr.Button('Clear All')
            
            
            with gr.Row():
                with gr.Column(scale=1):
                    gr.Markdown("**Step 1**: select the object.")
 
                with gr.Column(scale=1):
                    run_set_example_0 = gr.Button('Rope')
                
                with gr.Column(scale=1):
                    run_set_example_1 = gr.Button('Rope - Long')
                
                with gr.Column(scale=1):
                    run_set_example_2 = gr.Button('Toy Animal')
            
            with gr.Row():
                with gr.Column(scale=1):
                    gr.Markdown("**Step 2**: select the action.")
 
                with gr.Column(scale=1):
                    run_set_action_0 = gr.Button('Action 1')
                
                with gr.Column(scale=1):
                    run_set_action_1 = gr.Button('Action 2')
                
                with gr.Column(scale=1):
                    run_set_action_2 = gr.Button('Action 3')

            with gr.Row():
                with gr.Column(scale=1):
                    gr.Markdown("**Step 3**: click **Run** to visualize the predicted video and Splats.")
                
                with gr.Column(scale=1):
                    run_run = gr.Button('Run')

            with gr.Row():
                with gr.Column(scale=1, min_width=20):
                    with gr.Row():
                        gr.Markdown()
                    
                    with gr.Row():
                        gr.Markdown()
                    
                    with gr.Row():
                        gr.Markdown()
                    
                    with gr.Row():
                        gr.Markdown()
                    
                    # with gr.Row():
                    #     gr.Markdown()
                    
                    # with gr.Row():
                    #     gr.Markdown()
                    
                    with gr.Row():
                        gr.Markdown("Our model uses only 4 cameras for reconstructing the Gaussian Splats. Click the buttons below to change the view.")
                    
                    with gr.Row():
                        run_view_0 = gr.Button('View 0')
                    
                    with gr.Row():
                        run_view_1 = gr.Button('View 1')
                    
                    with gr.Row():
                        run_view_2 = gr.Button('View 2')
                    
                    with gr.Row():
                        run_view_3 = gr.Button('View 3')
                
                with gr.Column(scale=4):
                    with gr.Row():
                        with gr.Column(scale=2):
                            form_image = gr.Image(
                                label='Initial state and actions',
                                value=None,
                                width=self.width,
                                height=self.height,
                            )
                        
                        with gr.Column(scale=2):
                            form_video = gr.Video(
                                label='Predicted video',
                                value=None,
                                width=self.width,
                                height=self.height,
                            )

                    with gr.Row():
                        # with gr.Column(scale=1, min_width=20):
                        #     pass
                            # with gr.Row():
                            #     change_bg = gr.Button('Black/White Background')
                        
                        with gr.Column(scale=2):
                            form_3dgs_orig = gr.Model3D(
                                label='Original Gaussian Splats',
                                value=None,
                            )
                        
                        with gr.Column(scale=2):
                            form_3dgs_pred = gr.Model3D(
                                label='Predicted Gaussian Splats',
                                value=None,
                            )
            
            with gr.Row():
                gr.Markdown("## Notes:")
            
            with gr.Row():
                gr.Markdown("- Due to the computation constraints of Hugging Face Space, all results are precomputed. ")

            with gr.Row():
                gr.Markdown("- Training a GS for an object takes around 30 seconds. Prediction typically takes only 1-2 seconds for each push!")
            
            with gr.Row():
                gr.Markdown("- More examples may be added in the future. Stay tuned!")
            
            # with gr.Row():
            #     with gr.Column(scale=1):
            #         gr.Markdown("You can change the view to any of the 4 cameras.")
                
            #     with gr.Column(scale=1):
            #         run_view_0 = gr.Button('View 1')
                
            #     with gr.Column(scale=1):
            #         run_view_1 = gr.Button('View 2')
                
            #     with gr.Column(scale=1):
            #         run_view_2 = gr.Button('View 3')
                
            #     with gr.Column(scale=1):
            #         run_view_3 = gr.Button('View 4')

            # Set up callbacks

            run_reset.click(self.reset,
                    inputs=[],
                    outputs=[form_image, form_video, form_3dgs_orig, form_3dgs_pred])

            run_set_example_0.click(self.on_click_set_example,
                    inputs=[gr.State({'example_id': 0})],
                    outputs=[form_image, form_video, form_3dgs_orig, form_3dgs_pred])
            
            run_set_example_1.click(self.on_click_set_example,
                    inputs=[gr.State({'example_id': 1})],
                    outputs=[form_image, form_video, form_3dgs_orig, form_3dgs_pred])
            
            run_set_example_2.click(self.on_click_set_example,
                    inputs=[gr.State({'example_id': 2})],
                    outputs=[form_image, form_video, form_3dgs_orig, form_3dgs_pred])
            
            run_set_action_0.click(self.on_click_set_action,
                    inputs=[gr.State({'action_id': 0})],
                    outputs=[form_image])
            
            run_set_action_1.click(self.on_click_set_action,
                    inputs=[gr.State({'action_id': 1})],
                    outputs=[form_image])

            run_set_action_2.click(self.on_click_set_action,
                    inputs=[gr.State({'action_id': 2})],
                    outputs=[form_image])
            
            run_run.click(self.on_click_run,
                    inputs=[],
                    outputs=[form_video, form_3dgs_pred])
            
            run_view_0.click(self.on_click_change_view,
                    inputs=[gr.State({'view_id': 1})],
                    outputs=[form_image, form_video])
            
            run_view_1.click(self.on_click_change_view,
                    inputs=[gr.State({'view_id': 2})],
                    outputs=[form_image, form_video])

            run_view_2.click(self.on_click_change_view,
                    inputs=[gr.State({'view_id': 3})],
                    outputs=[form_image, form_video])
            
            run_view_3.click(self.on_click_change_view,
                    inputs=[gr.State({'view_id': 0})],
                    outputs=[form_image, form_video])
            
            # change_bg.click(self.on_click_change_bg,
            #         inputs=[],
            #         outputs=[form_3dgs_orig, form_3dgs_pred])

        app.launch(share=share)


if __name__ == '__main__':
    visualizer = DynamicsVisualizer()
    visualizer.launch(share=True)