"""
Flyer builder module - assembles the final adoption flyer.
"""

from PIL import Image, ImageDraw, ImageFont
import textwrap
import os
from pathlib import Path


def build_flyer(image, bio_text, flyer_data):
    """
    Build the final adoption flyer with image, text, and shelter info.
    
    Args:
        image: PIL Image of the composited animal photo
        bio_text: str, the generated bio
        flyer_data: dict with animal and shelter information
        
    Returns:
        tuple: (flyer_image, png_path, pdf_path)
    """
    
    # Create flyer canvas (8.5" x 11" at 300 DPI = 2550 x 3300, but we'll use 1200x1600 for digital)
    canvas_width = 1200
    canvas_height = 1600
    
    # Create white canvas
    canvas = Image.new('RGB', (canvas_width, canvas_height), 'white')
    draw = ImageDraw.Draw(canvas)
    
    # Define layout areas
    header_height = 120
    photo_top = header_height + 20
    photo_height = 700
    details_top = photo_top + photo_height + 30
    bio_top = details_top + 120
    footer_top = canvas_height - 100
    
    # Try to load fonts, fall back to default if not available
    try:
        # These are common system fonts
        title_font = _get_font(size=60, bold=True)
        heading_font = _get_font(size=28, bold=True)
        body_font = _get_font(size=22)
        detail_font = _get_font(size=20)
        footer_font = _get_font(size=18)
    except Exception as e:
        print(f"Font loading issue: {e}")
        title_font = heading_font = body_font = detail_font = footer_font = None
    
    # 1. Header - "ADOPT ME!"
    header_text = "🐾 ADOPT ME! 🐾"
    _draw_centered_text(draw, header_text, canvas_width // 2, 60, title_font, fill='#2E86AB')
    
    # 2. Animal Photo (centered)
    photo_width = 900
    photo = image.copy()
    photo.thumbnail((photo_width, photo_height), Image.Resampling.LANCZOS)
    
    photo_x = (canvas_width - photo.width) // 2
    photo_y = photo_top + (photo_height - photo.height) // 2
    
    # Add subtle border around photo
    border_padding = 10
    draw.rectangle(
        [photo_x - border_padding, photo_y - border_padding,
         photo_x + photo.width + border_padding, photo_y + photo.height + border_padding],
        outline='#cccccc',
        width=3
    )
    
    canvas.paste(photo, (photo_x, photo_y))
    
    # 3. Animal Details (name, breed, age, gender)
    name = flyer_data.get("name", "Unknown")
    breed = flyer_data.get("breed", "Mixed Breed")
    age = flyer_data.get("age", "Unknown")
    gender = flyer_data.get("gender", "")
    species = flyer_data.get("species", "Pet")
    
    # Name (large and centered)
    _draw_centered_text(draw, name, canvas_width // 2, details_top, heading_font, fill='#333333')
    
    # Details line
    details = f"{species} • {breed} • {age} • {gender}"
    _draw_centered_text(draw, details, canvas_width // 2, details_top + 40, detail_font, fill='#666666')
    
    # 4. Bio Text (wrapped)
    bio_y = bio_top
    bio_margin = 80
    bio_width = canvas_width - (bio_margin * 2)
    
    wrapped_bio = textwrap.fill(bio_text, width=60)
    
    for line in wrapped_bio.split('\n'):
        if bio_y > footer_top - 50:  # Don't overflow into footer
            break
        _draw_centered_text(draw, line, canvas_width // 2, bio_y, body_font, fill='#444444')
        bio_y += 35
    
    # 5. Footer - Shelter Contact Info
    draw.line([(100, footer_top - 30), (canvas_width - 100, footer_top - 30)], fill='#cccccc', width=2)
    
    shelter_name = flyer_data.get("shelter_name", "Animal Shelter")
    shelter_phone = flyer_data.get("shelter_phone", "")
    shelter_website = flyer_data.get("shelter_website", "")
    
    _draw_centered_text(draw, shelter_name, canvas_width // 2, footer_top, footer_font, fill='#2E86AB')
    
    contact_text = f"📞 {shelter_phone} • 🌐 {shelter_website}"
    _draw_centered_text(draw, contact_text, canvas_width // 2, footer_top + 35, footer_font, fill='#666666')
    
    # Save outputs
    output_dir = Path(__file__).parent.parent / "output"
    output_dir.mkdir(exist_ok=True)
    
    # Generate filename from animal name
    safe_name = "".join(c for c in name if c.isalnum() or c in (' ', '-', '_')).strip()
    safe_name = safe_name.replace(' ', '_')
    
    png_path = output_dir / f"{safe_name}_flyer.png"
    pdf_path = output_dir / f"{safe_name}_flyer.pdf"
    
    # Save PNG
    canvas.save(str(png_path), 'PNG', quality=95)
    print(f"Saved PNG to {png_path}")
    
    # Save PDF using reportlab
    try:
        _save_as_pdf(canvas, str(pdf_path))
        print(f"Saved PDF to {pdf_path}")
    except Exception as e:
        print(f"PDF generation failed: {e}")
        pdf_path = None
    
    return canvas, str(png_path), str(pdf_path) if pdf_path else None


def _get_font(size=20, bold=False):
    """
    Try to load a system font, fall back to default if unavailable.
    
    Args:
        size: int, font size
        bold: bool, whether to use bold variant
        
    Returns:
        ImageFont object
    """
    
    # Common font paths by OS
    font_options = [
        # Windows
        "C:/Windows/Fonts/arial.ttf",
        "C:/Windows/Fonts/arialbd.ttf" if bold else "C:/Windows/Fonts/arial.ttf",
        # macOS
        "/System/Library/Fonts/Helvetica.ttc",
        "/Library/Fonts/Arial.ttf",
        # Linux
        "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf",
        "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf" if bold else "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf",
    ]
    
    for font_path in font_options:
        if os.path.exists(font_path):
            try:
                return ImageFont.truetype(font_path, size)
            except Exception:
                continue
    
    # Fall back to default font
    try:
        return ImageFont.load_default()
    except Exception:
        return None


def _draw_centered_text(draw, text, x, y, font, fill='black'):
    """
    Draw text centered at the given x, y position.
    
    Args:
        draw: ImageDraw object
        text: str, text to draw
        x: int, center x position
        y: int, top y position
        font: ImageFont object
        fill: color for text
    """
    
    if font:
        bbox = draw.textbbox((0, 0), text, font=font)
        text_width = bbox[2] - bbox[0]
        text_x = x - text_width // 2
        draw.text((text_x, y), text, font=font, fill=fill)
    else:
        # Fallback without font (approximation)
        text_width = len(text) * 8  # Rough approximation
        text_x = x - text_width // 2
        draw.text((text_x, y), text, fill=fill)


def _save_as_pdf(image, pdf_path):
    """
    Save the flyer image as a PDF.
    
    Args:
        image: PIL Image
        pdf_path: str, output path for PDF
    """
    
    from reportlab.pdfgen import canvas as pdf_canvas
    from reportlab.lib.pagesizes import letter
    from reportlab.lib.units import inch
    import io
    
    # Create PDF
    c = pdf_canvas.Canvas(pdf_path, pagesize=letter)
    width, height = letter
    
    # Convert PIL image to bytes
    img_buffer = io.BytesIO()
    image.save(img_buffer, format='PNG')
    img_buffer.seek(0)
    
    # Calculate dimensions to fit letter size while maintaining aspect ratio
    img_width, img_height = image.size
    aspect = img_width / img_height
    
    target_width = width - (1 * inch)
    target_height = target_width / aspect
    
    if target_height > height - (1 * inch):
        target_height = height - (1 * inch)
        target_width = target_height * aspect
    
    # Center on page
    x = (width - target_width) / 2
    y = (height - target_height) / 2
    
    # Draw image
    c.drawImage(img_buffer, x, y, width=target_width, height=target_height)
    
    # Save PDF
    c.save()