import os
# Force cache to /tmp before any imports
os.environ['HF_HOME'] = '/tmp/huggingface'
os.environ['TRANSFORMERS_CACHE'] = '/tmp/huggingface/transformers'
os.environ['TORCH_HOME'] = '/tmp/torch'

import gradio as gr
import tempfile
from pathlib import Path
from wrapper import run_pipeline_on_image
from PIL import Image

# Base directory for preset images
BASE_DIR = Path(__file__).resolve().parent

# Preset images available for selection
PRESET_IMAGES = {
    "Sorghum": str(BASE_DIR / "Sorghum.tif"),
    "Corn": str(BASE_DIR / "Corn.tif"),
    "Cotton": str(BASE_DIR / "Cotton.tif"),
}

# Path to header logo
LOGO_PATH = str(BASE_DIR / "logo.png")


def process(file_path, preset_choice):
    """Process image and yield results progressively for immediate display."""
    # Determine dataset type (single-plant mode for Corn, multi-plant for others)
    single_plant_mode = False
    if preset_choice:
        chosen = PRESET_IMAGES.get(preset_choice)
        if chosen:
            file_path = chosen
            # Corn uses single-plant mode
            single_plant_mode = (preset_choice == "Corn")

    if not file_path:
        # Return 10 outputs (removed YOLO tips)
        return None, None, None, None, None, None, None, [], None, ""

    with tempfile.TemporaryDirectory() as tmpdir:
        src = Path(file_path)
        ext = src.suffix.lstrip('.') or 'tif'
        img_path = Path(tmpdir) / f"input.{ext}"

        try:
            # Copy raw uploaded bytes
            img_bytes = src.read_bytes()
            img_path.write_bytes(img_bytes)
        except Exception:
            # Fallback: save via PIL if direct copy fails
            Image.open(src).save(img_path)

        # Don't show immediate preview - wait for pipeline's InputImage for correctness
        input_preview = None

        # Helper to load PIL images
        def load_pil(path_str):
            try:
                if not path_str:
                    return None
                im = Image.open(path_str)
                copied = im.copy()
                im.close()
                return copied
            except Exception:
                return None

        # Run the pipeline progressively (generator)
        for outputs in run_pipeline_on_image(str(img_path), tmpdir, save_artifacts=True, single_plant_mode=single_plant_mode):
            # Load all available outputs progressively
            composite = load_pil(outputs.get('Composite'))
            overlay = load_pil(outputs.get('Overlay'))
            mask = load_pil(outputs.get('Mask'))
            input_img = load_pil(outputs.get('InputImage')) or input_preview
            size_img = load_pil(str(Path(tmpdir) / 'results/size.size_analysis.png'))

            # Texture images (green band)
            lbp_path = Path(tmpdir) / 'texture_output/lbp_green.png'
            hog_path = Path(tmpdir) / 'texture_output/hog_green.png'
            lac1_path = Path(tmpdir) / 'texture_output/lac1_green.png'
            texture_img = load_pil(str(lbp_path)) if lbp_path.exists() else None
            hog_img = load_pil(str(hog_path)) if hog_path.exists() else None
            lac1_img = load_pil(str(lac1_path)) if lac1_path.exists() else None

            # Vegetation indices
            order = ['NDVI', 'GNDVI', 'SAVI']
            gallery_items = [load_pil(outputs[k]) for k in order if k in outputs]

            stats_text = outputs.get('StatsText', '')

            # Yield intermediate/final results as they become available
            yield (
                input_img,
                composite,
                mask,
                overlay,
                texture_img,
                hog_img,
                lac1_img,
                gallery_items,
                size_img,
                stats_text,
            )


with gr.Blocks(fill_width=True) as demo:
    # Header logo (no share/download/fullscreen buttons), full width
    gr.Image(
        value=LOGO_PATH,
        show_label=False,
        interactive=False,
        height=80,
        container=False,
        show_download_button=False,
        show_share_button=False,
        show_fullscreen_button=False,
    )
    gr.Markdown("# 🌿 Automated Plant Analysis Demo")
    gr.Markdown("Upload a plant image (TIFF preferred) to compute and visualize composite, mask, overlay, texture, vegetation indices, and statistics.")

    with gr.Row():
        with gr.Column():
            # Use File input to preserve raw TIFFs
            inp = gr.File(
                type="filepath",
                file_types=[".tif", ".tiff", ".png", ".jpg"],
                label="Upload Image"
            )
            preset = gr.Radio(
                choices=list(PRESET_IMAGES.keys()),
                label="Or choose a preset image",
                value=None
            )
            run = gr.Button("Run Pipeline", variant="primary")

    # Row 1: input image
    with gr.Row():
        input_img = gr.Image(type="pil", label="Input Image", interactive=False, height=380)
    
    # Row 2: composite, mask, overlay
    with gr.Row():
        composite_img = gr.Image(type="pil", label="Composite (Segmentation Input)", interactive=False)
        mask_img = gr.Image(type="pil", label="Mask", interactive=False)
        overlay_img = gr.Image(type="pil", label="Segmentation Overlay", interactive=False)

    # Row 3: textures
    with gr.Row():
        texture_img = gr.Image(type="pil", label="Texture LBP (Green Band)", interactive=False)
        hog_img = gr.Image(type="pil", label="Texture HOG (Green Band)", interactive=False)
        lac1_img = gr.Image(type="pil", label="Texture Lac1 (Green Band)", interactive=False)
    
    # Row 4: vegetation indices
    gallery = gr.Gallery(label="Vegetation Indices", columns=3, height="auto")

    # Row 5: morphology size (YOLO removed)
    with gr.Row():
        size_img = gr.Image(type="pil", label="Plant Morphology", interactive=False)

    # Final: statistics table
    stats = gr.Textbox(label="Statistics", lines=4)

    run.click(
        process,
        inputs=[inp, preset],
        outputs=[
            input_img,
            composite_img,
            mask_img,
            overlay_img,
            texture_img,
            hog_img,
            lac1_img,
            gallery,
            size_img,
            stats,
        ]
    )

if __name__ == "__main__":
    demo.launch()