app.py

import cv2
import numpy as np
import gradio as gr
from pdf2image import convert_from_path
import os
import tempfile
import logging

# Set up logging to debug.log for debugging without affecting output
logging.basicConfig(
    filename='debug.log',
    level=logging.DEBUG,
    format='%(asctime)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)

# Function to validate poppler_path
def validate_poppler_path(poppler_path):
    """
    Validate if the provided poppler_path is valid and contains pdftoppm.
    Args:
        poppler_path (str): Path to poppler binaries.
    Returns:
        str or None: Valid poppler_path or None if invalid.
    """
    if not poppler_path:
        return None
    poppler_path = poppler_path.replace('\\', '/')  # Normalize path
    if not os.path.isdir(poppler_path):
        logger.error("Invalid poppler_path: %s is not a directory", poppler_path)
        return None
    pdftoppm_path = os.path.join(poppler_path, "pdftoppm" + (".exe" if os.name == "nt" else ""))
    if not os.path.isfile(pdftoppm_path):
        logger.error("pdftoppm not found in poppler_path: %s", poppler_path)
        return None
    logger.debug("Valid poppler_path: %s", poppler_path)
    return poppler_path

# Function to calculate materials based on blueprint dimensions
def calculate_materials_from_dimensions(wall_area, foundation_area):
    """
    Calculate required materials based on wall and foundation areas.
    Args:
        wall_area (float): Wall area in square meters.
        foundation_area (float): Foundation area in square meters.
    Returns:
        dict: Material quantities (cement in kg, bricks in units, steel in kg).
    """
    logger.debug(f"Calculating materials for wall_area={wall_area}, foundation_area={foundation_area}")
    
    # Validate inputs
    if not isinstance(wall_area, (int, float)) or not isinstance(foundation_area, (int, float)):
        logger.error("Invalid area type: wall_area=%s, foundation_area=%s", wall_area, foundation_area)
        raise ValueError("Wall and foundation areas must be numeric")
    if wall_area < 0 or foundation_area < 0:
        logger.error("Negative areas: wall_area=%s, foundation_area=%s", wall_area, foundation_area)
        raise ValueError("Wall and foundation areas must be non-negative")

    materials = {
        "cement": 0,
        "bricks": 0,
        "steel": 0
    }

    # Wall calculations (in m²)
    if wall_area > 0:
        materials['cement'] += wall_area * 10  # 10 kg cement per m²
        materials['bricks'] += wall_area * 500  # 500 bricks per m²
        materials['steel'] += wall_area * 2    # 2 kg steel per m²
        logger.debug("Wall materials: cement=%s kg, bricks=%s, steel=%s kg",
                     materials['cement'], materials['bricks'], materials['steel'])

    # Foundation calculations (in m²)
    if foundation_area > 0:
        materials['cement'] += foundation_area * 20  # 20 kg cement per m²
        materials['bricks'] += foundation_area * 750  # 750 bricks per m²
        materials['steel'] += foundation_area * 5     # 5 kg steel per m²
        logger.debug("Foundation materials: cement=%s kg, bricks=%s, steel=%s kg",
                     materials['cement'], materials['bricks'], materials['steel'])

    logger.info("Material calculation complete: %s", materials)
    return materials

# Function to process the blueprint from a single-page PDF
def process_blueprint(pdf_path, blueprint_width_m=27, blueprint_height_m=9.78, poppler_path=None):
    """
    Process a single-page PDF blueprint to estimate construction materials.
    Args:
        pdf_path (str): Path to the PDF file (single-page).
        blueprint_width_m (float): Blueprint width in meters (default: 27).
        blueprint_height_m (float): Blueprint height in meters (default: 9.78).
        poppler_path (str, optional): Path to poppler binaries.
    Returns:
        dict: Formatted material estimates or error message.
    """
    logger.info("Starting blueprint processing for PDF: %s", pdf_path)
    
    # Validate PDF file
    if not os.path.exists(pdf_path):
        logger.error("PDF file does not exist: %s", pdf_path)
        return {"error": f"PDF file not found: {pdf_path}"}
    
    # Validate blueprint dimensions
    if not isinstance(blueprint_width_m, (int, float)) or not isinstance(blueprint_height_m, (int, float)):
        logger.error("Invalid dimensions: width=%s, height=%s", blueprint_width_m, blueprint_height_m)
        return {"error": "Blueprint width and height must be numeric"}
    if blueprint_width_m <= 0 or blueprint_height_m <= 0:
        logger.error("Invalid dimensions: width=%s, height=%s", blueprint_width_m, blueprint_height_m)
        return {"error": "Blueprint width and height must be positive"}

    # Validate poppler_path
    poppler_path = validate_poppler_path(poppler_path)
    logger.debug("Using poppler_path: %s", poppler_path)

    try:
        # Convert single-page PDF to image
        logger.debug("Converting single-page PDF with poppler_path=%s", poppler_path)
        images = convert_from_path(
            pdf_path,
            first_page=1,
            last_page=1,
            poppler_path=poppler_path
        )
        if not images:
            logger.error("No image extracted from PDF")
            return {"error": "Failed to extract image from PDF (empty or invalid PDF)"}

        logger.info("Extracted 1 image from PDF")

        # Save the image to a temporary file
        with tempfile.NamedTemporaryFile(suffix=".png", delete=False) as temp_file:
            images[0].save(temp_file.name, 'PNG')
            temp_image_path = temp_file.name
            logger.debug("Saved temporary image to: %s", temp_image_path)

        # Verify temporary file
        if not os.path.exists(temp_image_path):
            logger.error("Temporary image file not created: %s", temp_image_path)
            return {"error": "Failed to create temporary image file"}

        # Load image with OpenCV
        image = cv2.imread(temp_image_path)
        if image is None:
            logger.error("Failed to load image: %s", temp_image_path)
            return {"error": "Could not load image from PDF"}

        logger.info("Loaded image with dimensions: %s", image.shape)

        # Clean up temporary file
        os.unlink(temp_image_path)
        logger.debug("Deleted temporary image: %s", temp_image_path)

        # Convert to grayscale
        gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
        logger.debug("Converted image to grayscale")

        # Apply edge detection
        edges = cv2.Canny(gray, 50, 150, apertureSize=3)
        logger.debug("Applied Canny edge detection")

        # Detect lines (walls) with Hough Transform
        lines = cv2.HoughLinesP(edges, 1, np.pi / 180, threshold=100, minLineLength=50, maxLineGap=10)
        logger.debug("Detected %s lines", len(lines) if lines is not None else 0)

        # Calculate total wall length (in pixels)
        total_wall_length_pixels = 0
        if lines is not None:
            for line in lines:
                x1, y1, x2, y2 = line[0]
                length = np.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)
                total_wall_length_pixels += length
                logger.debug("Line from (%d,%d) to (%d,%d), length=%f pixels", x1, y1, x2, y2, length)
        else:
            logger.warning("No lines detected in blueprint")

        logger.info("Total wall length: %f pixels", total_wall_length_pixels)

        # Get image dimensions
        image_height, image_width = image.shape[:2]
        logger.debug("Image dimensions: width=%d, height=%d pixels", image_width, image_height)

        # Calculate pixel-to-meter ratio
        pixel_to_meter_width = blueprint_width_m / image_width
        pixel_to_meter_height = blueprint_height_m / image_height
        pixel_to_meter = (pixel_to_meter_width + pixel_to_meter_height) / 2
        logger.debug("Pixel-to-meter ratios: width=%f, height=%f, average=%f",
                     pixel_to_meter_width, pixel_to_meter_height, pixel_to_meter)

        # Convert wall length to meters
        total_wall_length_m = total_wall_length_pixels * pixel_to_meter
        logger.info("Total wall length: %f meters", total_wall_length_m)

        # Estimate wall area (wall height = 3 m)
        wall_height_m = 3
        wall_area = total_wall_length_m * wall_height_m
        logger.info("Wall area: %f m² (length=%f m, height=%f m)",
                    wall_area, total_wall_length_m, wall_height_m)

        # Estimate foundation area (10% of total area)
        total_area = blueprint_width_m * blueprint_height_m
        foundation_area = total_area * 0.1
        logger.info("Total area: %f m², Foundation area: %f m²", total_area, foundation_area)

        # Calculate materials
        materials = calculate_materials_from_dimensions(wall_area, foundation_area)
        logger.info("Raw materials: %s", materials)

        # Format output (same as image-based app)
        formatted_materials = {
            "cement": f"{materials['cement']:.2f} kg",
            "bricks": f"{materials['bricks']:.0f} units",
            "steel": f"{materials['steel']:.2f} kg"
        }
        logger.info("Formatted materials: %s", formatted_materials)

        return formatted_materials

    except Exception as e:
        # Handle poppler and other errors
        error_msg = str(e)
        if "Unable to get page count" in error_msg or "poppler" in error_msg.lower():
            error_msg = (
                "Cannot convert PDF to image. Ensure poppler-utils is installed:\n"
                "- Windows: Download from https://github.com/oschwartz10612/poppler-windows, extract, "
                "and add the 'bin' folder (e.g., C:/poppler/bin) to PATH.\n"
                "- Linux: Run 'sudo apt-get install poppler-utils'.\n"
                "- Mac: Run 'brew install poppler'.\n"
                "Alternatively, enter the poppler 'bin' folder path in the Poppler Path field "
                "(e.g., C:/poppler/bin). Current poppler_path: %s" % poppler_path
            )
        logger.error("Processing failed: %s", error_msg)
        return {"error": f"Failed to process PDF: {error_msg}"}

# Set up Gradio interface
interface = gr.Interface(
    fn=process_blueprint,
    inputs=[
        gr.File(file_types=[".pdf"], label="Upload Single-Page Blueprint PDF"),
        gr.Number(label="Blueprint Width (meters)", value=27),
        gr.Number(label="Blueprint Height (meters)", value=9.78),
        gr.Textbox(label="Poppler Path (optional)", placeholder="e.g., C:/poppler/bin")
    ],
    outputs=gr.JSON(label="Material Estimates"),
    title="Blueprint Material Estimator",
    description=(
        "Upload a single-page PDF blueprint to estimate construction materials. "
        "Enter blueprint dimensions and, if poppler-utils is not in PATH, provide the path to poppler's 'bin' folder."
    )
)

# Launch the interface
if __name__ == "__main__":
    logger.info("Launching Gradio interface")
    interface.launch(share=False)