//build +js,wasm

package navigation

import (
	"syscall/js"
)

type HistoryManager struct {
	router *Router
	window js.Value
}

func NewHistoryManager(router *Router) *HistoryManager {
	return &HistoryManager{
		router: router,
		window: js.Global().Get("window"),
	}
}

func (h *HistoryManager) Start() {
	// Handle initial navigation
	currentPath := h.getCurrentPath()
	h.router.Navigate(currentPath)
	
	// Listen for browser back/forward events
	h.window.Call("addEventListener", "popstate", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
		path := h.getCurrentPath()
		h.router.Navigate(path)
		return nil
	}))
}

func (h *HistoryManager) PushState(path string) {
	h.window.Get("history").Call("pushState", nil, "", path)
	h.router.Navigate(path)
}

func (h *HistoryManager) ReplaceState(path string) {
	h.window.Get("history").Call("replaceState", nil, "", path)
	h.router.Navigate(path)
}

func (h *HistoryManager) Back() {
	h.window.Get("history").Call("back")
}

func (h *HistoryManager) Forward() {
	h.window.Get("history").Call("forward")
}

func (h *HistoryManager) getCurrentPath() string {
	location := h.window.Get("location")
	pathname := location.Get("pathname").String()
	search := location.Get("search").String()
	
	path := pathname
	if search != "" {
		path += search
	}
	
	return path
}