"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.nextFontError = exports.calculateFallbackFontValues = void 0;
const DEFAULT_SANS_SERIF_FONT = {
    name: 'Arial',
    azAvgWidth: 934.5116279069767,
    unitsPerEm: 2048,
};
const DEFAULT_SERIF_FONT = {
    name: 'Times New Roman',
    azAvgWidth: 854.3953488372093,
    unitsPerEm: 2048,
};
function calcAverageWidth(font) {
    try {
        const avgCharacters = 'aaabcdeeeefghiijklmnnoopqrrssttuvwxyz      ';
        const hasAllChars = font
            .glyphsForString(avgCharacters)
            .flatMap((glyph) => glyph.codePoints)
            .every((codePoint) => font.hasGlyphForCodePoint(codePoint));
        if (!hasAllChars)
            return undefined;
        const widths = font
            .glyphsForString(avgCharacters)
            .map((glyph) => glyph.advanceWidth);
        const totalWidth = widths.reduce((sum, width) => sum + width, 0);
        return totalWidth / widths.length;
    }
    catch {
        // Could not calculate average width from the font file, skip size-adjust
        return undefined;
    }
}
function formatOverrideValue(val) {
    return Math.abs(val * 100).toFixed(2) + '%';
}
function calculateFallbackFontValues(font, category = 'serif') {
    const fallbackFont = category === 'serif' ? DEFAULT_SERIF_FONT : DEFAULT_SANS_SERIF_FONT;
    const azAvgWidth = calcAverageWidth(font);
    const { ascent, descent, lineGap, unitsPerEm } = font;
    const fallbackFontAvgWidth = fallbackFont.azAvgWidth / fallbackFont.unitsPerEm;
    let sizeAdjust = azAvgWidth
        ? azAvgWidth / unitsPerEm / fallbackFontAvgWidth
        : 1;
    return {
        ascentOverride: formatOverrideValue(ascent / (unitsPerEm * sizeAdjust)),
        descentOverride: formatOverrideValue(descent / (unitsPerEm * sizeAdjust)),
        lineGapOverride: formatOverrideValue(lineGap / (unitsPerEm * sizeAdjust)),
        fallbackFont: fallbackFont.name,
        sizeAdjust: formatOverrideValue(sizeAdjust),
    };
}
exports.calculateFallbackFontValues = calculateFallbackFontValues;
function nextFontError(message) {
    const err = new Error(message);
    err.name = 'NextFontError';
    throw err;
}
exports.nextFontError = nextFontError;