import os
import re
import shutil
import time
from types import SimpleNamespace
from typing import Any

import gradio as gr
import numpy as np
from detectron2 import engine
from PIL import Image

from inference import main, setup_cfg

# internal settings
NUM_PROCESSES = 1
CROP = False
SCORE_THRESHOLD = 0.8
MAX_PARTS = 5
ARGS = SimpleNamespace(
    config_file="configs/coco/instance-segmentation/swin/opd_v1_real.yaml",
    model="../data/models/motion_state_pred_opdformerp_rgb.pth",
    input_format="RGB",
    output=".output",
    cpu=True,
)
NUM_SAMPLES = 10

outputs = []


def predict(rgb_image: str, depth_image: str, intrinsics: np.ndarray, num_samples: int) -> list[Any]:
    global outputs

    def find_gifs(path: str) -> list[str]:
        """Scrape folders for all generated gif files."""
        for file in os.listdir(path):
            sub_path = os.path.join(path, file)
            if os.path.isdir(sub_path):
                for image_file in os.listdir(sub_path):
                    if re.match(r".*\.gif$", image_file):
                        yield os.path.join(sub_path, image_file)

    def find_images(path: str) -> list[str]:
        """Scrape folders for all generated gif files."""
        images = {}
        for file in os.listdir(path):
            sub_path = os.path.join(path, file)
            if os.path.isdir(sub_path):
                images[file] = []
                for image_file in sorted(os.listdir(sub_path)):
                    if re.match(r".*\.png$", image_file):
                        images[file].append(os.path.join(sub_path, image_file))
        return images

    # clear old predictions
    for path in os.listdir(ARGS.output):
        full_path = os.path.join(ARGS.output, path)
        if os.path.isdir(full_path):
            shutil.rmtree(full_path)
        else:
            os.remove(full_path)

    cfg = setup_cfg(ARGS)

    engine.launch(
        main,
        NUM_PROCESSES,
        args=(
            cfg,
            rgb_image,
            depth_image,
            intrinsics,
            num_samples,
            CROP,
            SCORE_THRESHOLD,
        ),
    )

    # process output
    # TODO: may want to select these in decreasing order of score
    image_files = find_images(ARGS.output)
    outputs = []
    for count, part in enumerate(image_files):
        if count < MAX_PARTS:
            outputs.append([Image.open(im) for im in image_files[part]])

    return [
        *[gr.update(value=out[0], visible=True) for out in outputs],
        *[gr.update(visible=False) for _ in range(MAX_PARTS - len(outputs))],
    ]


def get_trigger(idx: int, fps: int = 40, oscillate: bool = True):
    def iter_images(*args, **kwargs):
        if idx < len(outputs):
            for im in outputs[idx]:
                time.sleep(1.0 / fps)
                yield im
            if oscillate:
                for im in reversed(outputs[idx]):
                    time.sleep(1.0 / fps)
                    yield im

        else:
            raise ValueError("Could not find any images to load into this module.")

    return iter_images


with gr.Blocks() as demo:
    gr.Markdown(
        """
    # OPDMulti Demo
    Upload an image to see its range of motion.
    """
    )

    # TODO: add gr.Examples

    with gr.Row():
        rgb_image = gr.Image(
            image_mode="RGB", source="upload", type="filepath", label="RGB Image", show_label=True, interactive=True
        )
        depth_image = gr.Image(
            image_mode="I;16", source="upload", type="filepath", label="Depth Image", show_label=True, interactive=True
        )

    intrinsics = gr.Dataframe(
        value=[
            [
                214.85935872395834,
                0.0,
                125.90160319010417,
            ],
            [
                0.0,
                214.85935872395834,
                95.13726399739583,
            ],
            [
                0.0,
                0.0,
                1.0,
            ],
        ],
        row_count=(3, "fixed"),
        col_count=(3, "fixed"),
        datatype="number",
        type="numpy",
        label="Intrinsics matrix",
        show_label=True,
        interactive=True,
    )
    num_samples = gr.Number(
        value=NUM_SAMPLES,
        label="Number of samples",
        show_label=True,
        interactive=True,
        precision=0,
        minimum=3,
        maximum=20,
    )

    examples = gr.Examples(
        examples=[
            ["examples/59-4860.png", "examples/59-4860_d.png"],
            ["examples/174-8460.png", "examples/174-8460_d.png"],
            ["examples/187-0.png", "examples/187-0_d.png"],
            ["examples/187-23040.png", "examples/187-23040_d.png"],
        ],
        inputs=[rgb_image, depth_image],
        api_name=False,
        examples_per_page=2,
    )

    submit_btn = gr.Button("Run model")

    # TODO: do we want to set a maximum limit on how many parts we render? We could also show the number of components
    # identified.
    images = [gr.Image(type="pil", label=f"Part {idx + 1}", visible=False) for idx in range(MAX_PARTS)]
    for idx, image_comp in enumerate(images):
        image_comp.select(get_trigger(idx), inputs=[], outputs=image_comp, api_name=False)

    submit_btn.click(
        fn=predict, inputs=[rgb_image, depth_image, intrinsics, num_samples], outputs=images, api_name=False
    )

demo.queue(api_open=False)
demo.launch()