import * as router from 'lib/router'

// Model

export type Route =
  | Login
  | Maps
  | Map;

type Login = {
    state: 'login'
}
export const login: Login = { state: 'login' }

type Maps = {
    state: 'maps'
}
export const maps: Maps = { state: 'maps' }

type Map = {
    state: 'map',
    id: string
}
export function map({ id }: { id: string }): Map {
    return { state: 'map', id }
}

// Serialization

export function get(url: string): Route | undefined {
    let res;

    if (url == '/login') {
        return { state: 'login' }
    } else if (url == '/') {
        return { state: 'maps' }
    } else if (res = router.matches(url, '/:id')) {
        return {
            state: 'map',
            id: res.data['id']
        }
    }
}

export function toString(route: Route): string {
    if (route.state == 'login') return '/login'
    else if (route.state == 'map') return `/${route.id}`
    else return '/'
}

// History

export function push(route: Route): void {
    history.pushState({}, '', toString(route))

    // Trigger pop state
    const popStateEvent = new PopStateEvent('popstate', {})
    dispatchEvent(popStateEvent)
}