//go:build js && wasm

// Command wasm is the client entry point: it wires client capabilities into the
// (generated) routes, then hydrates the server-rendered DOM or renders fresh.
package main

import (
	"kjolweb/app"
	"kjol/vdom"
	"kjol/wasmruntime"
)

func main() {
	// (The client transport for httputil.FetchGob / FetchJSON needs no wiring —
	// importing wasmruntime installs it. On the server it stays nil, so those
	// fetches no-op during SSR and the page ships its loading state.)
	//
	// Collect the signals created during setup so their values can be preserved
	// across an in-place hot swap. On a normal load RestoreState is nil (fresh
	// state); after a dev hot-reload it carries the previous instance's values,
	// which NewSignal restores by creation order.
	collector := vdom.BeginCollect(wasmruntime.RestoreState())
	router := wasmruntime.NewRouter()
	deps := app.Deps{Path: router.Path, Navigate: router.Navigate}
	routes := app.Routes(deps)
	vdom.EndCollect() // signals created later (during renders) aren't preserved
	wasmruntime.PreserveState(collector)

	render := func() *vdom.VNode { return app.Shell(deps, routes) }
	if wasmruntime.HasServerContent() {
		wasmruntime.Hydrate(render) // static route: adopt the server-rendered DOM
	} else {
		wasmruntime.Run(render) // client-rendered route
	}

	// Adopt the theme AFTER mounting. The class is already on <html> — the document's
	// boot script put it there before the first paint — so this is not what makes the
	// page dark; it is what makes the SWITCH know which way it is pointing, and what
	// keeps the page following the OS if the user never touched the switch.
	//
	// The server rendered this button not knowing the theme (it cannot: the preference is
	// in localStorage), so it drew the wrong icon. Init's signal write re-renders it, and
	// the reconciler patches the one button. That mismatch is inherent, not a bug — it is
	// the same reason the boot script has to exist at all.
	//
	// This line used to be unreachable: Hydrate ended in a `select {}` and never returned.
	// See wasmruntime.Wait.
	app.Theme.Init()

	// Last line, always: a Go/wasm main that returns is a dead program, and every event
	// handler on the page dies with it.
	wasmruntime.Wait()
}
