#!/usr/bin/env python3

import sys, os, subprocess, shutil, glob
import xml.etree.ElementTree as ET

# Can we extract this from HTML element itself? I couldn't.
namespaces = {
    "ft": "https://github.com/OpenType/fonttest",
    "xlink": "http://www.w3.org/1999/xlink",
}


def ns(s):
    ns, s = s.split(":")
    return "{%s}%s" % (namespaces[ns], s)


def unistr(s):
    return ",".join("U+%04X" % ord(c) for c in s)


def glyphstr(glyphs):
    out = []
    for glyphname, x, y in glyphs:
        if x or y:
            out.append("%s@%d,%d" % (glyphname, x, y))
        else:
            out.append(glyphname)
    return "[" + "|".join(out) + "]"


def extract_tests(input):
    html = ET.fromstring(input)
    found = False

    result = []

    for elt in html.findall(".//*[@class='expected'][@ft:id]", namespaces):
        found = True
        name = elt.get(ns("ft:id"))
        text = elt.get(ns("ft:render"))
        font = elt.get(ns("ft:font"))
        variations = elt.get(ns("ft:var"), "").replace(":", "=").replace(";", ",")
        glyphs = []
        for use in elt.findall(".//use"):
            x = int(use.get("x"))
            y = int(use.get("y"))
            href = use.get(ns("xlink:href"))
            assert href[0] == "#"
            glyphname = ".".join(href[1:].split("/")[1].split(".")[1:])
            glyphs.append((glyphname, x, y))
        opts = "--font-size=1000 --ned --remove-default-ignorables"
        if variations:
            opts = opts + " --variations=%s" % variations
        result.append(
            "../fonts/%s;%s;%s;%s" % (font, opts, unistr(text), glyphstr(glyphs))
        )

    for elt in html.findall(".//*[@class='expected-no-crash'][@ft:id]", namespaces):
        found = True
        name = elt.get(ns("ft:id"))
        text = elt.get(ns("ft:render"))
        font = elt.get(ns("ft:font"))
        variations = elt.get(ns("ft:var"), "").replace(":", "=").replace(";", ",")
        opts = ""
        if variations:
            opts = "--variations=%s" % variations
        result.append("../fonts/%s;%s;%s;*" % (font, opts, unistr(text)))

    assert found
    return "\n".join(result) + "\n"


os.chdir(os.getenv("srcdir", os.path.dirname(__file__)))

git = shutil.which("git")
assert git

if os.path.isdir("./text-rendering-tests"):
    subprocess.run([git, "pull"], cwd="text-rendering-tests", check=True)
else:
    subprocess.run(
        [git, "clone", "https://github.com/unicode-org/text-rendering-tests"],
        check=True,
    )

shutil.rmtree("fonts", ignore_errors=True)
assert not os.path.exists("fonts")
shutil.copytree("text-rendering-tests/fonts", "fonts")
subprocess.run([git, "add", "fonts"], check=True)

shutil.rmtree("tests", ignore_errors=True)
assert not os.path.isdir("tests")
os.mkdir("tests")

with open("DISABLED", "r") as f:
    disabled = f.read()

tests = []
disabled_tests = []

for x in sorted(os.listdir("text-rendering-tests/testcases")):
    if not x.endswith(".html") or x == "index.html":
        continue
    out = "tests/%s.tests" % x.split(".html")[0]
    with open("text-rendering-tests/testcases/" + x, "r") as f:
        content = f.read()
    with open(out, "w") as f:
        f.write("@font-funcs=ot,ft\n")
        f.write(extract_tests(content))
    if out in disabled:
        disabled_tests.append(out)
    else:
        tests.append(out)

subprocess.run([git, "add", "tests"], check=True)

with open("meson.build", "w") as f:
    f.write(
        "\n".join(
            ["text_rendering_tests_tests = ["]
            + ["  '%s'," % x.split("tests/")[1] for x in tests]
            + ["]", "", "disabled_text_rendering_tests_tests = ["]
            + ["  '%s'," % x.split("tests/")[1] for x in disabled_tests]
            + ["]", ""]
        )
    )

subprocess.run([git, "add", "meson.build"], check=True)

print(
    'Updated the testsuit, now run `git commit -e -m "[test/text-rendering-tests] Update from upstream"`'
)