import SessionView from "./session/SessionView.js";
import LoginView from "./login/LoginView.js";
import SessionPickerView from "./login/SessionPickerView.js";
import TemplateView from "./general/TemplateView.js";
import SwitchView from "./general/SwitchView.js";

export default class BrawlView {
    constructor(vm) {
        this._vm = vm;
        this._switcher = null;
        this._root = null;
        this._onViewModelChange = this._onViewModelChange.bind(this);
    }

    _getView() {
        switch (this._vm.activeSection) {
            case "error":
                return new StatusView({header: "Something went wrong", message: this._vm.errorText});
            case "loading":
                return new StatusView({header: "Loading", message: this._vm.loadingText});
            case "session":
                return new SessionView(this._vm.sessionViewModel);
            case "login":
                return new LoginView(this._vm.loginViewModel);
            case "picker":
                return new SessionPickerView(this._vm.sessionPickerViewModel);
            default:
                throw new Error(`Unknown section: ${this._vm.activeSection}`);
        }
    }

    _onViewModelChange(prop) {
        if (prop === "activeSection") {
            this._switcher.switch(this._getView());
        }
    }

    mount() {
        this._switcher = new SwitchView(this._getView());
        this._root = this._switcher.mount();
        this._vm.on("change", this._onViewModelChange);
        return this._root;
    }

    unmount() {
        this._vm.off("change", this._onViewModelChange);
        this._switcher.unmount();
    }

    root() {
        return this._root;
    }

    update() {}
}

class StatusView extends TemplateView {
    render(t, vm) {
        return t.div({className: "StatusView"}, [
            t.h1(vm.header),
            t.p(vm.message),
        ]);
    }
}