import ThemeViewState from "./src/Models/ThemeViewState"
import SvelteUIElement from "./src/UI/Base/SvelteUIElement"
import ThemeViewGUI from "./src/UI/ThemeViewGUI.svelte"
import LayoutConfig from "./src/Models/ThemeConfig/LayoutConfig";
import MetaTagging from "./src/Logic/MetaTagging";
import { FixedUiElement } from "./src/UI/Base/FixedUiElement";
import { Utils } from "./src/Utils"
import Constants from "./src/Models/Constants"

function webgl_support() {
    try {
        var canvas = document.createElement("canvas")
        return (
            !!window.WebGLRenderingContext &&
            (canvas.getContext("webgl") || canvas.getContext("experimental-webgl"))
        )
    } catch (e) {
        return false
    }
}

async function timeout(timeMS: number): Promise<{ layers: string[] }> {
    await Utils.waitFor(timeMS)
    return { layers: [] }
}


async function getAvailableLayers(): Promise<Set<string>> {
    try {
        const host = new URL(Constants.VectorTileServer).host
        const status = await Promise.any([
                               //    Utils.downloadJson("https://" + host + "/summary/status.json"),
                                   timeout(0)
                               ])
        return new Set<string>(status.layers)
    } catch (e) {
        console.error("Could not get MVT available layers due to", e)
        return new Set<string>()
    }
}

async function main() {
    if (!webgl_support()) {
         new FixedUiElement("WebGL is not supported or not enabled. This is essential for MapComplete to function, please enable this.").SetClass("block alert").AttachTo("maindiv")
    }else{
        const availableLayers = await getAvailableLayers()
        MetaTagging.setThemeMetatagging(new ThemeMetaTagging())
        // LAYOUT.ADD_LAYERS
        const state = new ThemeViewState(new LayoutConfig(<any> layout), availableLayers)
        const main = new SvelteUIElement(ThemeViewGUI, { state })
        main.AttachTo("maindiv")
        Array.from(document.getElementsByClassName("delete-on-load")).forEach(el => {
                    el.parentElement.removeChild(el)
                })
    }
}
main()