package og;

import java.awt.Font;

import java.awt.FontFormatException;

import java.awt.GraphicsEnvironment;

import java.io.IOException;

import java.net.URI;

import java.nio.file.Files;

import java.nio.file.Path;

import java.util.Map;

/** Downloads and registers Inter + JetBrains Mono fonts. */

public final class FontManager {

static final Path FONT_CACHE = Path.of(

System.getProperty("user.home"), ".cache", "javaevolved-fonts");

static final Map<String, String> FONT_URLS = Map.of(

"Inter-Regular.ttf",

"https://fonts.gstatic.com/s/inter/v20/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuLyfMZg.ttf",

"Inter-Medium.ttf",

"https://fonts.gstatic.com/s/inter/v20/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuI6fMZg.ttf",

"Inter-SemiBold.ttf",

"https://fonts.gstatic.com/s/inter/v20/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuGKYMZg.ttf",

"Inter-Bold.ttf",

"https://fonts.gstatic.com/s/inter/v20/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuFuYMZg.ttf",

"JetBrainsMono-Regular.ttf",

"https://fonts.gstatic.com/s/jetbrainsmono/v24/tDbY2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKxjPQ.ttf",

"JetBrainsMono-Medium.ttf",

"https://fonts.gstatic.com/s/jetbrainsmono/v24/tDbY2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8-qxjPQ.ttf"

);

/** Download fonts to cache and register with Java's graphics environment. */

public static void ensureFonts() throws IOException {

Files.createDirectories(FONT_CACHE);

var ge = GraphicsEnvironment.getLocalGraphicsEnvironment();

for (var entry : FONT_URLS.entrySet()) {

var file = FONT_CACHE.resolve(entry.getKey());

if (!Files.exists(file)) {

System.out.println("Downloading %s...".formatted(entry.getKey()));

try (var in = URI.create(entry.getValue()).tourl().openStream()) {

Files.copy(in, file);

}

}

try {

var font = Font.createFont(Font.TRUETYPE_FONT, file.toFile());

ge.registerFont(font);

} catch (FontFormatException e) {

System.out.println("[WARN] Could not register font %s: %s"

.formatted(entry.getKey(), e.getMessage()));

}

}

}

/** Load a specific font file at the given size. */

public static Font getFont(String filename, float size) {

try {

var path = FONT_CACHE.resolve(filename);

return Font.createFont(Font.TRUETYPE_FONT, path.toFile()).deriveFont(size);

} catch (FontFormatException | IOException e) {

throw new RuntimeException("Cannot load font: " + filename, e);

}

}

private FontManager() {}

}