import random
from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.platypus import SimpleDocTemplate, Table, TableStyle, Paragraph, Spacer, PageBreak
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont
import argparse

def format_and_return(a, b, operation, result):
    """
    Formats and returns a math problem string along with its result.
    
    Args:
        a (int): The first operand in the math problem.
        b (int): The second operand in the math problem.
        operation (str): The mathematical operation ('+', '-', '*', '/') to be performed.
        result (int): The result of the math problem.
        
    Returns:
        tuple: A tuple containing the formatted math problem string and its result.
    """
    a_str, b_str = str(a).rjust(2, ' '), str(b).rjust(2, ' ')
    return f"{a_str} {operation} {b_str} =", result

def generate_math_problem():
    """
    Generates a random math problem with an operation chosen from addition, subtraction, multiplication, or division.
    
    The operands are randomly generated integers, with the following constraints:
        - Both operands are within the range [0, 20] for addition and subtraction.
        - Both operands are within the range [0, 20] for multiplication.
        - For division, the divisor is within the range [1, 5] and the dividend is a multiple of the divisor, within the range [1, 40].

    Returns:
        tuple: A tuple containing the formatted math problem string and the correct result (integer).
    """
    operation = random.choice(['+', '-', '*', '/'])
    a, b = random.randint(0, 20), random.randint(0, 20)

    if operation == '+':
        return format_and_return(a, b, operation, a + b)
    elif operation == '-':
        a, b = max(a, b), min(a, b)
        return format_and_return(a, b, operation, a - b)
    elif operation == '*':
        return format_and_return(a, b, operation, a * b)
    elif operation == '/':
        b = random.randint(1, 5)
        a = b * random.randint(1, 40 // b)
        return format_and_return(a, b, operation, a // b)

def create_brain_jogging_pdf(filename):
    """
    Creates a brain jogging PDF with math problems and saves it to the specified filename.

    The PDF contains 20 rows with 4 math problems per row, chosen randomly from addition, subtraction, multiplication, and division.
    The PDF has two pages: the first page contains only the math problems, and the second page includes the problems along with their results.

    Args:
        filename (str): The output PDF filename.

    Dependencies:
        - reportlab.lib.pagesizes.A4
        - reportlab.platypus.SimpleDocTemplate
        - reportlab.platypus.Paragraph
        - reportlab.platypus.Spacer
        - reportlab.platypus.Table
        - reportlab.platypus.PageBreak
        - reportlab.lib.colors
        - reportlab.platypus.TableStyle
        - reportlab.lib.styles.getSampleStyleSheet
        - reportlab.pdfbase.pdfmetrics
        - reportlab.pdfbase.ttfonts.TTFont
    """
    problems = [[generate_math_problem() for _ in range(4)] for _ in range(20)]
    data = [[problem[0] for problem in row] for row in problems]
    data_with_results = [[f"{problem[0]} {problem[1]}" for problem in row] for row in problems]

    doc = SimpleDocTemplate(filename, pagesize=A4)
    styles = getSampleStyleSheet()

    # Add title and time line
    title = Paragraph("Brain Jogging Exercises", styles['Heading1'])
    time_line = Paragraph("Time: _______________", styles['BodyText'])

    # Create a table for the title and time line
    title_table = Table([[title, time_line]], colWidths=(A4[0] / 2) * 0.75)
    
    title_table_style = TableStyle([
        ('GRID', (0, 0), (-1, -1), 1, colors.white),
        ('ALIGN', (0, 0), (-1, -1), 'LEFT'),
        ('FONTNAME', (0, 0), (-1, -1), 'Helvetica'),
        ('FONTSIZE', (0, 0), (-1, -1), 12),
        ('BOTTOMPADDING', (0, 0), (-1, -1), 12),
    ])

    title_table.setStyle(title_table_style)

    table = Table(data, colWidths=(A4[0] / 4) * 0.75)
    table_with_results = Table(data_with_results, colWidths=(A4[0] / 4) * 0.75)

    font_name = 'Consolas'  # Change this to the desired name for your font
    font_path = './Consolas.ttf'  # Change this to the path of the font file

    custom_font = TTFont(font_name, font_path)
    pdfmetrics.registerFont(custom_font)

    # Define table style
    table_style = TableStyle([
        ('GRID', (0, 0), (-1, -1), 1, colors.white),
        ('ALIGN', (0, 0), (-1, -1), 'LEFT'),
        ('FONTNAME', (0, 0), (-1, -1), 'Consolas'),
        ('FONTSIZE', (0, 0), (-1, -1), 12),
        ('BOTTOMPADDING', (0, 0), (-1, -1), 16),
    ])
    table.setStyle(table_style)
    table_with_results.setStyle(table_style)

    # Add tables to the PDF
    doc.build([
        title_table,
        Spacer(1, 12),
        table,
        PageBreak(),
        title_table,
        Spacer(1, 12),
        table_with_results
    ])

def main():
    parser = argparse.ArgumentParser(description="Create a brain jogging PDF.")
    parser.add_argument("filename", nargs="?", default="brain-jogging.pdf",
                        help="The output PDF filename. (default: %(default)s)")

    args = parser.parse_args()
    create_brain_jogging_pdf(args.filename)

if __name__ == "__main__":
    main()