package webdemo

import (
	"net/http"

	"billing/internal/web"
)

const managementBase = "/v0/management/plugins/billing"
const resourceUI = "/v0/resource/plugins/billing/ui"

type Input interface {
	ServeHTTP(http.ResponseWriter, *http.Request)
}

func NewServer(input Input) http.Handler {
	mux := http.NewServeMux()
	mux.HandleFunc("GET /{$}", func(response http.ResponseWriter, request *http.Request) {
		http.Redirect(response, request, "/ui", http.StatusTemporaryRedirect)
	})
	mux.HandleFunc("GET /ui", asset("text/html; charset=utf-8", web.UI()))
	mux.HandleFunc("GET /ui-config.js", asset("text/javascript; charset=utf-8", []byte(`window.BILLING_UI_CONFIG = Object.freeze({managementBase:"/v0/management/plugins/billing",readOnlyBase:"/v0/resource/plugins/billing/ui",managementKey:"demo",lockManagementKey:true,hideManagementKey:true,demoPerspectives:true});`)))
	mux.HandleFunc("GET /styles/{name}", embeddedAsset("styles/"))
	mux.HandleFunc("GET /app/{path...}", embeddedAsset("app/"))
	mux.HandleFunc("GET /v0/resource/plugins/billing/ui-config.js", asset("text/javascript; charset=utf-8", []byte(`window.BILLING_UI_CONFIG = Object.freeze({managementBase:"/v0/management/plugins/billing",readOnlyBase:"/v0/resource/plugins/billing/ui",managementKey:"demo",lockManagementKey:true,hideManagementKey:true,demoPerspectives:true});`)))
	mux.HandleFunc("GET /v0/resource/plugins/billing/styles/{name}", embeddedAsset("styles/"))
	mux.HandleFunc("GET /v0/resource/plugins/billing/app/{path...}", embeddedAsset("app/"))
	mux.Handle(managementBase+"/", input)
	mux.Handle(resourceUI, input)
	return mux
}

func embeddedAsset(prefix string) http.HandlerFunc {
	return func(response http.ResponseWriter, request *http.Request) {
		name := request.PathValue("name")
		if path := request.PathValue("path"); path != "" {
			name = path
		}
		body, contentType, found := web.Asset(prefix + name)
		if !found {
			http.NotFound(response, request)
			return
		}
		asset(contentType, body)(response, request)
	}
}

func asset(contentType string, body []byte) http.HandlerFunc {
	return func(response http.ResponseWriter, _ *http.Request) {
		response.Header().Set("Content-Type", contentType)
		response.Header().Set("Cache-Control", "no-store")
		response.WriteHeader(http.StatusOK)
		_, _ = response.Write(body)
	}
}