from pyPdf import PdfFileWriter, PdfFileReader
import StringIO
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import letter

import json
import sys

json_file = sys.argv[1]

data = json.load(open(json_file))

packet = StringIO.StringIO()
can = canvas.Canvas(packet)
for value in data["objects"]:
    if value["type"] == "text":
        can.drawString(value["x"], value["y"], value["value"])
        print("write {0}".format(value["value"]))
    else:
        if value["type"] == "image":
            can.drawImage(value["value"], value["x"], value["y"], value["size_x"], value["size_y"])
can.save()

packet.seek(0)
new_pdf = PdfFileReader(packet)
existing_pdf = PdfFileReader(file(data["template"], "rb"))
output = PdfFileWriter()
page = existing_pdf.getPage(0)
page.mergePage(new_pdf.getPage(0))
output.addPage(page)
outputStream = file(data["outfile"], "wb")
output.write(outputStream)
outputStream.close()