#!/usr/bin/env python3
"""Generate the light colour scheme from the dark one.

There is one set of design tokens, not two themes. The light scheme is the
same file with the roles swapped, so a colour can only be changed in one
place and the two can never drift apart.
"""

import pathlib
import re

ROOT = pathlib.Path(__file__).resolve().parent.parent
COLORS = ROOT / "config" / "plasma" / "colors"

# dark value -> light value
ROLES = {
    "20,28,32": "242,245,244",      # window background
    "25,35,40": "233,238,237",      # alternate
    "15,23,26": "255,255,255",      # view background
    "18,26,30": "236,241,240",      # header
    "16,23,26": "228,234,233",      # header, inactive
    "30,42,47": "225,231,230",      # button alternate
    "230,237,239": "22,35,42",      # normal text
    "147,165,170": "96,116,122",    # inactive text
    "170,186,191": "80,99,105",     # inactive header text
    "125,142,147": "120,138,144",
    "79,179,168": "46,140,130",     # accent
    "126,196,255": "26,110,180",    # link
    "227,106,106": "192,57,57",     # negative
    "224,177,92": "166,116,24",     # neutral
    "111,207,151": "38,142,86",     # positive
    "156,138,222": "104,80,180",    # visited
    "14,21,24": "255,255,255",      # text on a selection
    "10,16,18": "255,255,255",
}

HEADER = (
    "# Ekklesia Classroom — light.\n"
    "#\n"
    "# GENERATED from EkklesiaDark.colors by tools/build-light-scheme.\n"
    "# Edit the dark scheme and regenerate; do not edit this file by hand."
)


def main():
    dark = (COLORS / "EkklesiaDark.colors").read_text()

    light = dark
    for old, new in sorted(ROLES.items(), key=lambda item: -len(item[0])):
        light = re.sub(rf"(?<![\d,]){re.escape(old)}(?![\d,])", "\0" + new, light)

    light = light.replace("\0", "")
    light = light.replace("Ekklesia Classroom Dark", "Ekklesia Classroom Light")
    light = light.replace("ColorScheme=EkklesiaDark", "ColorScheme=EkklesiaLight")
    light = light.replace("# Ekklesia Classroom — dark. The default.", HEADER)

    (COLORS / "EkklesiaLight.colors").write_text(light)
    print("wrote", COLORS / "EkklesiaLight.colors")


if __name__ == "__main__":
    main()