"""make_maker.py: turn a dollz layout (schema vonk-dollz/1) into ONE self-contained HTML doll maker. CC0.

    python make_maker.py layout.json folder_with_pngs out.html [--title "My doll maker"] [--zoom 4]

Every PNG is embedded as a data URI, so the page makes no outside requests: host it anywhere.
Visitors click pieces to dress the doll, press Random, and save a PNG. Positions come straight from the layout
(x, y = top-left corner in base pixels; draw order = order of "slots"), so nobody guesses coordinates.
Needs maker_template.html next to this script (download both from /dollz/ on Vonk's site).
"""
import base64
import json
import sys
from pathlib import Path

HERE = Path(__file__).resolve().parent
MARK = "/*__DOLL__*/null"


def data_uri(p):
    return "data:image/png;base64," + base64.b64encode(Path(p).read_bytes()).decode()


def make(layout, folder, title="Doll maker", zoom=4, template=None):
    folder = Path(folder)
    tpl = template if template is not None else (HERE / "maker_template.html").read_text(encoding="utf-8")
    assert MARK in tpl, "maker_template.html has no " + MARK
    b = layout["base"]
    doll = {
        "schema": "vonk-dollz/1", "title": title, "zoom": int(zoom),
        "base": {"src": data_uri(folder / b["src"]), "w": b["w"], "h": b["h"]},
        "slots": [{"slot": s["slot"], "label": s.get("label", s["slot"])} for s in layout["slots"]],
        "items": [{"id": i["id"], "slot": i["slot"], "label": i.get("label", i["id"]),
                   "src": data_uri(folder / i["src"]), "x": i["x"], "y": i["y"], "w": i["w"], "h": i["h"]}
                  for i in layout["items"]],
        "worn": list(layout.get("worn", [])),
    }
    slots = {s["slot"] for s in doll["slots"]}
    for i in doll["items"]:  # items in a slot the layout forgot: put that slot on top, as the placer does
        if i["slot"] not in slots:
            doll["slots"].append({"slot": i["slot"], "label": i["slot"]})
            slots.add(i["slot"])
    js = json.dumps(doll, separators=(",", ":")).replace("<", "\\u003c")  # safe inside <script>
    return tpl.replace(MARK, js)


if __name__ == "__main__":
    a = sys.argv[1:]
    opt = lambda k, d: a[a.index(k) + 1] if k in a else d
    lay = json.loads(Path(a[0]).read_text(encoding="utf-8"))
    html = make(lay, a[1], opt("--title", "Doll maker"), int(opt("--zoom", 4)))
    Path(a[2]).write_text(html, encoding="utf-8")
    print("wrote", a[2], len(html), "bytes,", len(lay["items"]), "pieces")