#!/usr/bin/env python3
import sys
from pathlib import Path
import textwrap
import re

try:
    from reportlab.lib.pagesizes import letter
    from reportlab.pdfgen import canvas
    from reportlab.lib.units import inch
    from reportlab.lib import colors
except Exception as e:
    print('Missing reportlab:', e)
    sys.exit(2)


def wrap_text(text, max_chars):
    return textwrap.wrap(text, width=max_chars)


def draw_wrapped(c, text, x, y, font_name, font_size, max_width, indent=0):
    # Estimate chars per line roughly
    approx_char_width = font_size * 0.55
    max_chars = max(20, int((max_width - indent) / approx_char_width))
    wrapped = wrap_text(text, max_chars)
    line_height = font_size * 1.25
    for line in wrapped:
        c.drawString(x + indent, y, line)
        y -= line_height
    return y
#!/usr/bin/env python3
import sys
from pathlib import Path
import textwrap

try:
    from reportlab.lib.pagesizes import letter
    from reportlab.pdfgen import canvas
    from reportlab.lib.units import inch
    from reportlab.lib import colors
except Exception as e:
    print('Missing reportlab:', e)
    sys.exit(2)


def wrap_text(text, max_chars):
    return textwrap.wrap(text, width=max_chars)


def draw_wrapped(c, text, x, y, font_name, font_size, max_width, indent=0):
    # Estimate chars per line roughly
    approx_char_width = font_size * 0.55
    max_chars = max(20, int((max_width - indent) / approx_char_width))
    wrapped = wrap_text(text, max_chars)
    line_height = font_size * 1.25
    for line in wrapped:
        c.drawString(x + indent, y, line)
        y -= line_height
    return y


if len(sys.argv) < 3:
    print('Usage: md_to_pdf.py input.md output.pdf')
    sys.exit(1)

in_path = Path(sys.argv[1])
out_path = Path(sys.argv[2])

if not in_path.exists():
    print('Input file not found:', in_path)
    sys.exit(1)

text = in_path.read_text(encoding='utf-8')
lines = text.splitlines()

c = canvas.Canvas(str(out_path), pagesize=letter)
width, height = letter
left = inch * 0.75
right = inch * 0.75
top = height - inch * 0.75
bottom = inch * 0.75
max_width = width - left - right

# default fonts
REGULAR = 'Helvetica'
BOLD = 'Helvetica-Bold'
MONO = 'Courier'

y = top

in_code = False
code_font_size = 8
para_font_size = 10

for raw in lines:
    line = raw.rstrip('\n')
    if line.strip() == '':
        y -= para_font_size * 0.6
        if y < bottom:
            c.showPage()
            y = top
        continue

    # Code fence toggle
    if line.strip().startswith('```'):
        in_code = not in_code
        if in_code:
            y -= 6
        else:
            y -= 6
        if y < bottom:
            c.showPage()
            y = top
        continue

    if in_code:
        c.setFont(MONO, code_font_size)
        # draw code line with small left indent
        y = draw_wrapped(c, line, left, y, MONO, code_font_size, max_width, indent=10)
        c.setFont(REGULAR, para_font_size)
        if y < bottom:
            c.showPage()
            y = top
        continue

    # Headings
    if line.lstrip().startswith('#'):
        hashes, _, rest = line.partition(' ')
        level = hashes.count('#')
        text = rest.strip()
        # add extra space BEFORE top-level headings so they don't butt against previous paragraph
        if level == 1:
            y -= para_font_size * 1.8
        elif level == 2:
            y -= para_font_size * 0.8
        else:
            y -= para_font_size * 0.6

        if level == 1:
            font_size = 18
            font = BOLD
        elif level == 2:
            font_size = 14
            font = BOLD
        else:
            font_size = 12
            font = BOLD
        c.setFont(font, font_size)
        y = draw_wrapped(c, text, left, y, font, font_size, max_width)
        # modest spacing after headings
        y -= para_font_size * 0.6
        c.setFont(REGULAR, para_font_size)
        if y < bottom:
            c.showPage()
            y = top
        continue

    # Horizontal rule
    if line.strip() in ('---', '***', '___'):
        c.setStrokeColor(colors.black)
        c.setLineWidth(1)
        y -= 6
        c.line(left, y, left + max_width, y)
        y -= 12
        if y < bottom:
            c.showPage()
            y = top
        continue

    # Lists
    stripped = line.lstrip()
    if stripped.startswith(('- ', '* ', '+ ')) or stripped[:2].isdigit() and stripped[2:].startswith('. '):
        bullet = '•'
        content = stripped[2:].strip() if not stripped[0].isdigit() else stripped.split('.', 1)[1].strip()
        c.setFont(REGULAR, para_font_size)
        # draw bullet and wrapped content with indent
        c.drawString(left, y, bullet)
        y = draw_wrapped(c, content, left + 12, y, REGULAR, para_font_size, max_width, indent=0)
        if y < bottom:
            c.showPage()
            y = top
        continue

    # Paragraph
    c.setFont(REGULAR, para_font_size)
    y = draw_wrapped(c, line, left, y, REGULAR, para_font_size, max_width)
    if y < bottom:
        c.showPage()
        y = top

c.save()
print('Wrote PDF:', out_path)