from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import letter
from reportlab.lib.utils import ImageReader
from io import BytesIO
from models.schemas import MeasurementMetadata, MeasurementResult
from PIL import Image, ImageDraw
import logging

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

class PdfService:
    """
    A service to generate PDF reports.
    """
    def create_report(
        self, 
        image_bytes: bytes, 
        metadata: MeasurementMetadata, 
        results: MeasurementResult,
        ml_results: dict
    ) -> bytes:
        """
        Generates a PDF report with the measurement data.
        """
        logger.info(f"Creating PDF with metadata: {metadata}")
        logger.info(f"Creating PDF with results: {results}")

        buffer = BytesIO()
        p = canvas.Canvas(buffer, pagesize=letter)
        width, height = letter

        # Title
        p.setFont("Helvetica-Bold", 16)
        p.drawString(72, height - 72, "Ship Draft Measurement Report")

        # Metadata
        p.setFont("Helvetica", 12)
        p.drawString(72, height - 108, f"Ship ID: {metadata.ship_id}")
        p.drawString(72, height - 126, f"Timestamp: {metadata.timestamp.strftime('%Y-%m-%d %H:%M:%S')}")
        p.drawString(72, height - 144, f"Latitude: {metadata.latitude}")
        p.drawString(72, height - 162, f"Longitude: {metadata.longitude}")

        # # Measurement Results
        # p.setFont("Helvetica-Bold", 14)
        # p.drawString(72, height - 198, "Measurement Results")
        # p.setFont("Helvetica", 12)
        # p.drawString(90, height - 218, f"Draft Measurement: {results.draft_measurement:.1f} meters")
        # p.drawString(90, height - 236, f"Confidence Score: {results.confidence_score:.2%}")

        # ML Results
        p.setFont("Helvetica-Bold", 14)
        y_position = height - 270
        p.drawString(72, y_position, "ML Results")
        y_position -= 18
        p.setFont("Helvetica", 12)

        # Highlight draft from ML results
        if 'draft' in ml_results:
            p.setFont("Helvetica-Bold", 12) # Highlight
            p.drawString(90, y_position, f"ML Draft: {ml_results['draft']:.2f} meters")
            p.setFont("Helvetica", 12) # Reset font
            y_position -= 18

        # Add other ML results (excluding arrays and images)
        for key, value in ml_results.items():
            if key in ['pose_results', 'segment_results', 'original_image', 'pose_image_result', 'segment_image_result', 'final_image_result']:
                continue
            p.drawString(90, y_position, f"{key.replace('_', ' ').title()}: {value}")
            y_position -= 18

        # Images
        p.setFont("Helvetica-Bold", 14)
        y_position -= 18
        p.drawString(72, y_position, "Images")
        y_position -= 18
        p.setFont("Helvetica", 12)

        # Convert numpy arrays to PIL Image and then to bytes for ReportLab
        def get_image_bytes(np_array):
            if np_array is None:
                return None
            img = Image.fromarray(np_array.astype('uint8'))
            img_byte_arr = BytesIO()
            img.save(img_byte_arr, format='PNG')
            return img_byte_arr.getvalue()

        # Define starting positions and dimensions for horizontal layout
        x_start = 72
        image_width = 150
        image_height = 150 # Assuming square or adjust as needed
        y_image_row = y_position - image_height - 20 # Position for the bottom of the images

        current_x = x_start

        # Draw original image
        if 'original_image' in ml_results and ml_results['original_image'] is not None:
            original_img_bytes = get_image_bytes(ml_results['original_image'])
            if original_img_bytes:
                p.drawString(current_x, y_image_row + image_height + 5, "Original Image:") # Label above image
                p.drawImage(ImageReader(BytesIO(original_img_bytes)), current_x, y_image_row, width=image_width, height=image_height, preserveAspectRatio=True)
                current_x += image_width + 20 # Move x for next image

        # Draw pose image result
        if 'pose_image_result' in ml_results and ml_results['pose_image_result'] is not None:
            pose_img_bytes = get_image_bytes(ml_results['pose_image_result'])
            if pose_img_bytes:
                p.drawString(current_x, y_image_row + image_height + 5, "Pose Image Result:")
                p.drawImage(ImageReader(BytesIO(pose_img_bytes)), current_x, y_image_row, width=image_width, height=image_height, preserveAspectRatio=True)
                current_x += image_width + 20

        # Draw segment image result
        if 'segment_image_result' in ml_results and ml_results['segment_image_result'] is not None:
            segment_img_bytes = get_image_bytes(ml_results['segment_image_result'])
            if segment_img_bytes:
                p.drawString(current_x, y_image_row + image_height + 5, "Segment Image Result:")
                p.drawImage(ImageReader(BytesIO(segment_img_bytes)), current_x, y_image_row, width=image_width, height=image_height, preserveAspectRatio=True)
                # No need to update current_x as it's the last image in the row

        # Update y_position for content after images
        y_position = y_image_row - 20 # Adjust y_position to be below the images

        p.showPage()
        p.save()

        pdf_bytes = buffer.getvalue()
        buffer.close()
        return pdf_bytes