import { sveltekit } from '@sveltejs/kit/vite';
import tailwindcss from '@tailwindcss/vite';
import { defineConfig, type Plugin } from 'vite';
import { execSync } from 'child_process';
import { fontSubsetPlugin, type FontSubsetConfig } from './vite-plugin-font-subset';

// Character sets for font subsetting
const TITLE_CHARS = 'PACMN-';
const COMMON_CHARS =
	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 .,!?':;-_()\/@#&*+=%<>";

const fontConfig: FontSubsetConfig = {
	fonts: [
		{
			source: '@fontsource/russo-one/files/russo-one-latin-400-normal.woff2',
			whitelist: TITLE_CHARS
		},
		{
			source: '@fontsource/outfit/files/outfit-latin-400-normal.woff2',
			whitelist: COMMON_CHARS,
			family: 'Outfit'
		},
		{
			source: '@fontsource/outfit/files/outfit-latin-500-normal.woff2',
			whitelist: COMMON_CHARS,
			family: 'Outfit'
		}
	]
};

/**
 * Vite plugin that injects the Pacman version hash at build time.
 * Uses git commit hash in production/dev, falls back to timestamp if git unavailable.
 */
function pacmanVersionPlugin(): Plugin {
	function getVersion(mode: string): string {
		if (mode === 'development') {
			return 'dev';
		}

		try {
			const hash = execSync('git rev-parse --short HEAD', {
				encoding: 'utf8',
				stdio: ['pipe', 'pipe', 'pipe']
			}).trim();

			if (hash) {
				return hash;
			}
		} catch {
			// Git not available or command failed
		}

		return Date.now().toString(36);
	}

	return {
		name: 'pacman-version',
		config(_, { mode }) {
			const version = getVersion(mode);
			console.log(`[pacman-version] Using version: ${version}`);

			return {
				define: {
					'import.meta.env.VITE_PACMAN_VERSION': JSON.stringify(version)
				}
			};
		}
	};
}

export default defineConfig({
	plugins: [fontSubsetPlugin(fontConfig), pacmanVersionPlugin(), sveltekit(), tailwindcss()],
	build: {
		target: 'es2022'
	},
	server: {
		proxy: {
			'/api': {
				target: process.env.VITE_API_TARGET || 'http://localhost:3001',
				changeOrigin: true
			}
		}
	}
});