import spaces
import os
import subprocess
import tempfile
import uuid
import glob
import shutil
import time
import gradio as gr
import sys
from PIL import Image

# Set environment variables
os.environ["PIXEL3DMM_CODE_BASE"] = f"{os.getcwd()}"
os.environ["PIXEL3DMM_PREPROCESSED_DATA"] = f"{os.getcwd()}/proprocess_results"
os.environ["PIXEL3DMM_TRACKING_OUTPUT"] = f"{os.getcwd()}/tracking_results"

def sh(cmd): subprocess.check_call(cmd, shell=True)

os.system(f"pip install -e {os.getcwd()}")

from pixel3dmm import env_paths

sh("cd src/pixel3dmm/preprocessing/facer && pip install -e .")
sh("cd src/pixel3dmm/preprocessing/PIPNet/FaceBoxesV2/utils && sh make.sh")


def install_cuda_toolkit():
    CUDA_TOOLKIT_URL = "https://developer.download.nvidia.com/compute/cuda/12.1.0/local_installers/cuda_12.1.0_530.30.02_linux.run"
    CUDA_TOOLKIT_FILE = "/tmp/%s" % os.path.basename(CUDA_TOOLKIT_URL)
    subprocess.call(["wget", "-q", CUDA_TOOLKIT_URL, "-O", CUDA_TOOLKIT_FILE])
    subprocess.call(["chmod", "+x", CUDA_TOOLKIT_FILE])
    subprocess.call([CUDA_TOOLKIT_FILE, "--silent", "--toolkit"])

    os.environ["CUDA_HOME"] = "/usr/local/cuda"
    os.environ["PATH"] = "%s/bin:%s" % (os.environ["CUDA_HOME"], os.environ["PATH"])
    os.environ["LD_LIBRARY_PATH"] = "%s/lib:%s" % (
        os.environ["CUDA_HOME"],
        "" if "LD_LIBRARY_PATH" not in os.environ else os.environ["LD_LIBRARY_PATH"],
    )
    # Fix: arch_list[-1] += '+PTX'; IndexError: list index out of range
    os.environ["TORCH_CUDA_ARCH_LIST"] = "9.0"
    print("==> finished installation")
    
install_cuda_toolkit()

import os
import torch
import numpy as np
import trimesh
from pytorch3d.io import load_obj
from pixel3dmm.tracking.renderer_nvdiffrast import NVDRenderer
from pixel3dmm.tracking.flame.FLAME import FLAME
from pixel3dmm.tracking.tracker import Tracker
from omegaconf import OmegaConf


DEVICE = "cuda"

base_conf = OmegaConf.load(f'{env_paths.CODE_BASE}/configs/tracking.yaml')

_mesh_file = env_paths.head_template
flame_model = FLAME(base_conf).to(DEVICE)

_obj_faces = load_obj(_mesh_file)[1]

diff_renderer = NVDRenderer(
    image_size=base_conf.size, 
    obj_filename=_mesh_file,
    no_sh=False,
    white_bg=True
).to(DEVICE)


# Utility to select first image from a folder
def first_image_from_dir(directory):
    patterns = ["*.jpg", "*.png", "*.jpeg"]
    files = []
    for p in patterns:
        files.extend(glob.glob(os.path.join(directory, p)))
    if not files:
        return None
    return sorted(files)[0]

# Function to reset the UI and state
def reset_all():
    return (
        None,  # crop_img
        None,  # normals_img
        None,  # uv_img
        None,  # track_img
        "Awaiting new image upload...",  # status
        {},    # state
        gr.update(interactive=True),   # preprocess_btn
        gr.update(interactive=False),  # normals_btn
        gr.update(interactive=False),  # uv_map_btn
        gr.update(interactive=False)   # track_btn
    )

# Step 1: Preprocess the input image (Save and Crop)
# @spaces.GPU()
def preprocess_image(image_array, state):
    if image_array is None:
        return "❌ Please upload an image first.", None, state, gr.update(interactive=True), gr.update(interactive=False)

    session_id = str(uuid.uuid4())
    base_dir = os.path.join(os.environ["PIXEL3DMM_PREPROCESSED_DATA"], session_id)
    os.makedirs(base_dir, exist_ok=True)
    state.update({"session_id": session_id, "base_dir": base_dir})

    img = Image.fromarray(image_array)
    saved_image_path = os.path.join(base_dir, f"{session_id}.png")
    img.save(saved_image_path)
    state["image_path"] = saved_image_path
    
    try:
        p = subprocess.run([
            "python", "scripts/run_preprocessing.py", "--video_or_images_path", saved_image_path
        ], check=True, capture_output=True, text=True)
    except subprocess.CalledProcessError as e:
        err = f"❌ Preprocess failed (exit {e.returncode}).\n\n{e.stdout}\n{e.stderr}"
        shutil.rmtree(base_dir)
        return err, None, {}, gr.update(interactive=True), gr.update(interactive=False)

    crop_dir = os.path.join(base_dir, "cropped")
    image = first_image_from_dir(crop_dir)
    return "✅ Step 1 complete. Ready for Normals.", image, state, gr.update(interactive=False), gr.update(interactive=True)

# Step 2: Normals inference → normals image
@spaces.GPU()
def step2_normals(state):
    session_id = state.get("session_id")
    if not session_id:
        return "❌ State lost. Please start from Step 1.", None, state, gr.update(interactive=False), gr.update(interactive=False)

    try:
        p = subprocess.run([
            "python", "scripts/network_inference.py", "model.prediction_type=normals", f"video_name={session_id}"
        ], check=True, capture_output=True, text=True)
    except subprocess.CalledProcessError as e:
        err = f"❌ Normal map failed (exit {e.returncode}).\n\n{e.stdout}\n{e.stderr}"
        return err, None, state, gr.update(interactive=True), gr.update(interactive=False)

    normals_dir = os.path.join(state["base_dir"], "p3dmm", "normals")
    image = first_image_from_dir(normals_dir)
    return "✅ Step 2 complete. Ready for UV Map.", image, state, gr.update(interactive=False), gr.update(interactive=True)

# Step 3: UV map inference → uv map image
@spaces.GPU()
def step3_uv_map(state):
    session_id = state.get("session_id")
    if not session_id:
        return "❌ State lost. Please start from Step 1.", None, state, gr.update(interactive=False), gr.update(interactive=False)

    try:
        p = subprocess.run([
            "python", "scripts/network_inference.py", "model.prediction_type=uv_map", f"video_name={session_id}"
        ], check=True, capture_output=True, text=True)
    except subprocess.CalledProcessError as e:
        err = f"❌ UV map failed (exit {e.returncode}).\n\n{e.stdout}\n{e.stderr}"
        return err, None, state, gr.update(interactive=True), gr.update(interactive=False)

    uv_dir = os.path.join(state["base_dir"], "p3dmm", "uv_map")
    image = first_image_from_dir(uv_dir)
    return "✅ Step 3 complete. Ready for Tracking.", image, state, gr.update(interactive=False), gr.update(interactive=True)

# Step 4: Tracking → final tracking image
@spaces.GPU()
def step4_track(state):
    session_id = state.get("session_id")
    base_conf.video_name = f'{session_id}'
    tracker = Tracker(base_conf, flame_model, diff_renderer)
    tracker.run()

    tracking_dir = os.path.join(os.environ["PIXEL3DMM_TRACKING_OUTPUT"], session_id, "frames")
    image = first_image_from_dir(tracking_dir)

    return "✅ Pipeline complete!", image, state, gr.update(interactive=False)

# Build Gradio UI
demo = gr.Blocks()

with demo:
    gr.Markdown("## Image Processing Pipeline")
    gr.Markdown("Upload an image, then click the buttons in order. Uploading a new image will reset the process.")
    with gr.Row():
        with gr.Column():
            image_in = gr.Image(label="Upload Image", type="numpy", height=512)
            status = gr.Textbox(label="Status", lines=2, interactive=False, value="Upload an image to start.")
            state = gr.State({})
        with gr.Column():
            with gr.Row():
                crop_img = gr.Image(label="Preprocessed", height=256)
                normals_img = gr.Image(label="Normals", height=256)
            with gr.Row():
                uv_img = gr.Image(label="UV Map", height=256)
                track_img = gr.Image(label="Tracking", height=256)

    with gr.Row():
        preprocess_btn = gr.Button("Step 1: Preprocess", interactive=True)
        normals_btn = gr.Button("Step 2: Normals", interactive=False)
        uv_map_btn = gr.Button("Step 3: UV Map", interactive=False)
        track_btn = gr.Button("Step 4: Track", interactive=False)

    # Define component list for reset
    outputs_for_reset = [crop_img, normals_img, uv_img, track_img, status, state, preprocess_btn, normals_btn, uv_map_btn, track_btn]

    # Pipeline execution logic
    preprocess_btn.click(
        fn=preprocess_image,
        inputs=[image_in, state],
        outputs=[status, crop_img, state, preprocess_btn, normals_btn]
    )
    normals_btn.click(
        fn=step2_normals,
        inputs=[state],
        outputs=[status, normals_img, state, normals_btn, uv_map_btn]
    )
    uv_map_btn.click(
        fn=step3_uv_map,
        inputs=[state],
        outputs=[status, uv_img, state, uv_map_btn, track_btn]
    )
    track_btn.click(
        fn=step4_track,
        inputs=[state],
        outputs=[status, track_img, state, track_btn]
    )

    # Event to reset everything when a new image is uploaded
    image_in.upload(fn=reset_all, inputs=None, outputs=outputs_for_reset)

# ------------------------------------------------------------------
# START THE GRADIO SERVER
# ------------------------------------------------------------------
demo.queue()
demo.launch(share=True, ssr_mode=False)