import tailwindcss from "@tailwindcss/vite";
import { sveltekit } from "@sveltejs/kit/vite";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { defineConfig } from "vite";
import { DEV_API_PROXY_TARGET, DEV_WEB_PORT } from "../../scripts/dev-ports.mjs";
import { detectHostProfile } from "../../scripts/lowmem-env.mjs";

const monorepoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");

const profile = detectHostProfile();
/** Env wins; otherwise follow auto RAM/CPU tier. */
const lowMem =
	process.env.BUILD_LOW_MEM != null && process.env.BUILD_LOW_MEM !== ""
		? process.env.BUILD_LOW_MEM !== "0"
		: profile.lowMem;

export default defineConfig({
	// Load PUBLIC_* from monorepo-root .env (same file as the Go API).
	envDir: monorepoRoot,
	plugins: [tailwindcss(), sveltekit()],
	build: {
		// Gzip size reporting double-reads output and spikes peak RSS on tiny hosts.
		reportCompressedSize: !lowMem,
		// Production maps are opt-in; maps roughly double transform memory.
		sourcemap: process.env.BUILD_SOURCEMAP === "1",
		// Smaller inlined assets → less heap during transform on 4GB boxes.
		assetsInlineLimit: lowMem ? 1024 : 4096,
		rolldownOptions: {
			checks: {
				// Informative only; sveltekit-guard resolveId dominates wall time (see Rolldown docs).
				pluginTimings: process.env.BUILD_PLUGIN_TIMINGS === "1"
			}
		}
	},
	server: {
		// true → all interfaces (IPv4 + IPv6). Default localhost is ::1-only on Windows,
		// which breaks 127.0.0.1 probes and some browser Happy Eyeballs paths.
		host: true,
		port: DEV_WEB_PORT,
		strictPort: true,
		proxy: {
			"/api": { target: DEV_API_PROXY_TARGET, changeOrigin: true },
			"/healthz": { target: DEV_API_PROXY_TARGET, changeOrigin: true },
			"/readyz": { target: DEV_API_PROXY_TARGET, changeOrigin: true }
		}
	}
});