"""Extract notation glyph bounds from the shipped OTF, in staff-space units."""
import argparse
from pathlib import Path

from fontTools.pens.boundsPen import BoundsPen
from fontTools.ttLib import TTFont


def generate(font_path, output):
    with TTFont(font_path) as font:
        glyphs, cmap = font.getGlyphSet(), font.getBestCmap()
        units = font['head'].unitsPerEm / 4
        ranges = [(0xE050, 0xE06F), (0xE080, 0xE09F), (0xE0A0, 0xE0A5),
                  (0xE101, 0xE102), (0xE1E7, 0xE1E8), (0xE240, 0xE250),
                  (0xE260, 0xE270), (0xE4E0, 0xE4EE)]
        records = []
        for start, end in ranges:
            for codepoint in range(start, end):
                if codepoint not in cmap:
                    continue
                pen = BoundsPen(glyphs)
                glyphs[cmap[codepoint]].draw(pen)
                if pen.bounds:
                    box = ', '.join(f'{v / units:.8f}F' for v in pen.bounds)
                    records.append(f'  {{{codepoint}, {{{box}}}}},')
    output.parent.mkdir(parents=True, exist_ok=True)
    output.write_text('#pragma once\n#include <array>\nnamespace vamp_zero::font_data {\n'
                      'struct glyph { int codepoint; std::array<float, 4> bounds; };\n'
                      f'inline constexpr std::array<glyph, {len(records)}> glyphs = {{{{\n'
                      + '\n'.join(records) + '\n}};\n}\n', encoding='ascii')


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('--font', type=Path, required=True)
    parser.add_argument('--output', type=Path, required=True)
    args = parser.parse_args()
    generate(args.font, args.output)