import os
os.environ["GRADIO_API_FORCE_3"] = "1"
import gradio as gr
import sys
import json
import shutil
import gdown
import time
from PIL import Image
from io import BytesIO

# ==================================
# SETUP
# ==================================

print("🚀 Gradio App Starting...")

BASE_DIR = os.path.dirname(os.path.abspath(__file__))

# Paths
UPLOAD_DIR = "/tmp/uploads/"
JSON_DIR = "/tmp/results/"
OUTPUT_DIR = "/tmp/output/"
MODEL_DIR = os.path.join(BASE_DIR, "rcnn_model", "scripts")
logo_path = os.path.join(BASE_DIR, "public", "logo.png")
model_path = os.path.join(OUTPUT_DIR, "model_final.pth")

# Google Drive model
GOOGLE_DRIVE_FILE_ID = "1yr64AOgaYZPTcQzG6cxG6lWBENHR9qjW"
GDRIVE_URL = f"https://drive.google.com/uc?id={GOOGLE_DRIVE_FILE_ID}"

# Create folders
os.makedirs(UPLOAD_DIR, exist_ok=True)
os.makedirs(JSON_DIR, exist_ok=True)
os.makedirs(OUTPUT_DIR, exist_ok=True)

# Copy logo.png to /tmp
logo_src = os.path.join(BASE_DIR, "public", "logo.png")
logo_dst = "/tmp/logo.png"

# Only copy if not already there
if not os.path.exists(logo_dst):
    shutil.copy(logo_src, logo_dst)

# Download model if missing
if not os.path.exists(model_path):
    print("🚀 Model file not found! Downloading...")
    try:
        gdown.download(GDRIVE_URL, model_path, quiet=False, use_cookies=False)
        print("✅ Model downloaded successfully.")
    except Exception as e:
        print(f"❌ Failed to download model: {e}")

# Import model
sys.path.append(MODEL_DIR)
from rcnn_model.scripts.rcnn_run import main, write_config

cfg = write_config()

# ==================================
# MAIN PREDICTION FUNCTION
# ==================================

def predict(uploaded_file_path):
    print("Inside Predict:" + uploaded_file_path)
    if uploaded_file_path is None:
        return None, None, "No file uploaded.", None

    # Save uploaded file to temp
    uploaded_path = os.path.join(UPLOAD_DIR, "input_image.png")
    shutil.copy(uploaded_file_path, uploaded_path)

    input_filename = "input_image.png"

    output_json_name = input_filename.replace(".png", "_result.json").replace(".jpg", "_result.json").replace(".jpeg", "_result.json")
    output_image_name = input_filename.replace(".png", "_result.png").replace(".jpg", "_result.png").replace(".jpeg", "_result.png")

    output_json_path = os.path.join(JSON_DIR, output_json_name)
    output_image_path = os.path.join(JSON_DIR, output_image_name)

    # Run model
    main(cfg, uploaded_path, output_json_name, output_image_name)

    # Read outputs
    result_img = Image.open(output_image_path) if os.path.exists(output_image_path) else None
    result_json = {}
    if os.path.exists(output_json_path):
        with open(output_json_path, "r") as jf:
            result_json = json.load(jf)

    # Save JSON to file for download
    download_json_path = os.path.join(JSON_DIR, "output_for_download.json")
    with open(download_json_path, "w") as f:
        json.dump(result_json, f, indent=2)

    return result_img, json.dumps(result_json, indent=2), None, download_json_path, uploaded_path

# ==================================
# GRADIO UI
# ==================================

with gr.Blocks() as demo:
    # Header
    with gr.Row():
        gr.Markdown(
            f"""
    <div style='display: flex; align-items: center; justify-content: center;'>
        <img src='file/tmp/logo.png' style='height: 50px; margin-right: 10px;'/>
        <h1>Inovonics 2D Floorplan Vectorizer</h1>
    </div>
    """
        )

    with gr.Row():
        with gr.Column():
            uploaded_file = gr.File(label="Upload your Floorplan Image", type="filepath")
            uploaded_image_display = gr.Image(label="Uploaded Image", visible=True)
            run_button = gr.Button("Run Vectorizer 🔥")

        with gr.Column():
            output_image = gr.Image(label="🖼 Output Vectorized Image")
            download_button = gr.File(label="⬇️ Download JSON", visible=True)
            output_json = gr.JSON(label="🧾 Output JSON")

    error_output = gr.Textbox(label="Error Message", visible=False)

    # Logic binding
    # run_button.click(
    #     predict,
    #     inputs=[uploaded_file],
    #     outputs=[output_image, output_json, error_output, download_button, uploaded_image_display]
    # )

    run_button.click(
    lambda x: (x, gr.update(interactive=False)),
    inputs=[uploaded_file],
    outputs=[uploaded_file, run_button],
    ).then(
        predict,
        inputs=[uploaded_file],
        outputs=[output_image, output_json, error_output, download_button, uploaded_image_display]
    ).then(
    lambda: gr.update(interactive=True),
    None,
    [run_button],
    )
demo.launch(server_name="0.0.0.0", server_port=7860, share=True)