import io

from pypdf import PdfReader, PdfWriter
from reportlab.lib.colors import Color
from reportlab.lib.pagesizes import letter
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.pdfgen import canvas


def replace_pdf(input_pdf, output_pdf):
    # テキスト変換器の設定
    outfp = io.StringIO()

    pdfmetrics.registerFont(TTFont("TakaoGothic", "/usr/share/fonts/truetype/takao-gothic/TakaoGothic.ttf"))

    # ページ単位でテキスト変換

    reader = PdfReader(input_pdf)
    page_number = len(reader.pages)
    output = PdfWriter()

    for page_num in range(page_number):
        page = reader.pages[page_num]
        packet = io.BytesIO()
        can = canvas.Canvas(packet, pagesize=letter)

        # todo
        print(f"{page.mediabox.width=}")
        print(f"{page.mediabox.height=}")
        print(f"{page.mediabox.top=}")

        font_size = 16
        can.setFont("TakaoGothic", font_size)
        can.setFillColor(Color(0, 0, 0, alpha=1))
        can.drawString(
            0,
            0,
            "こんにちは世界！",
        )
        can.save()

        packet.seek(0)
        new_pdf = PdfReader(packet)
        page.merge_page(new_pdf.pages[0])

        output.add_page(page)

    with open(output_pdf, "wb") as f:
        output.write(f)


replace_pdf("tests/sample.pdf", "data/output1.pdf")

# transformation = Transformation().rotate(90)
# new_pdf.pages[0].add_transformation(transformation, expand=True)
# page.merge_translated_page(new_pdf.pages[0], tx=page.mediabox.width, ty=0, expand=True)