#!/usr/bin/python

from datetime import date
from gimpfu import *

def watermarkfu(timg, tdrawable,
                watermark,
                anotherline="<today>",
                scalefactor_text=12.0,
                scalefactor_boundry=2.3,
                watermark_opacity=16.66):

    # make copy of input
    img = pdb.gimp_image_duplicate(timg)

    # simplify source image
    img.flatten()

    # expand text macro
    anotherline = anotherline.replace("<today>",
                                      date.today().strftime("%Y-%m-%d"))

    # create text
    text = pdb.gimp_text_layer_new(img,
                                   "\n".join([watermark, anotherline]),
                                   "Iosevka Ultra-Bold",
                                   68, UNIT_POINT)

    # add to image, justification doesn't work otherwise
    img.add_layer(text, 0)

    # justify text
    pdb.gimp_text_layer_set_justification(img.layers[0], TEXT_JUSTIFY_CENTER)

    # scale down text layer, maintaining ratio
    pdb.gimp_layer_scale(img.layers[0],
                         ((float(text.width)/text.height)*(img.height/scalefactor_text)),
                         (img.height/scalefactor_text),
                         TRUE)

    # crate padding around text
    pdb.gimp_layer_resize(img.layers[0],
                          (text.width*scalefactor_boundry),
                          (text.height*scalefactor_boundry),
                          (((text.width*scalefactor_boundry)-text.width)/2),
                          (((text.height*scalefactor_boundry)-text.height)/2),
                          )

    pdb.plug_in_make_seamless(img, img.layers[0])
    pdb.plug_in_tile(img, img.layers[0], img.width, img.height, False)

    # move to 0,0
    (offx, offy) = pdb.gimp_drawable_offsets(img.layers[0])
    pdb.gimp_layer_translate(img.layers[0], (offx*-1), (offy*-1))

    # tune mode + opacity
    pdb.gimp_layer_set_opacity(img.layers[0], watermark_opacity)
    pdb.gimp_layer_set_mode(img.layers[0], HARDLIGHT_MODE)

    # show to user
    pdb.gimp_display_new(img)


register(
    "python_fu_watermark",
    "WatermarkFu",
    "WatermarkFu",
    "robertgzr",
    "robertgzr",
    "2023",
    "<Image>/Filters/Render/WatermarkFu",
    "RGB*, GRAY*",
    [
        (PF_STRING, "watermark", "watermark text", ""),
        (PF_STRING, "anotherline", "another line", "<today>"),
        (PF_FLOAT, "scalefactor_text", "scalefactor text", 12.0),
        (PF_FLOAT, "scalefactor_boundry", "scalefactor boundry", 2.3),
        (PF_FLOAT, "watermark_opacity", "watermark opacity", 16.66),
    ],
    [],
    watermarkfu,
)

main()