/*
Copyright 2020 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import * as React from "react";
import { useContext, useState } from "react";

import AutoHideScrollbar from "./AutoHideScrollbar";
import { getHomePageUrl } from "../../utils/pages";
import { _tDom } from "../../languageHandler";
import SdkConfig from "../../SdkConfig";
import dis from "../../dispatcher/dispatcher";
import { Action } from "../../dispatcher/actions";
import BaseAvatar from "../views/avatars/BaseAvatar";
import { OwnProfileStore } from "../../stores/OwnProfileStore";
import AccessibleButton, { ButtonEvent } from "../views/elements/AccessibleButton";
import { UPDATE_EVENT } from "../../stores/AsyncStore";
import { useEventEmitter } from "../../hooks/useEventEmitter";
import MatrixClientContext from "../../contexts/MatrixClientContext";
import MiniAvatarUploader, { AVATAR_SIZE } from "../views/elements/MiniAvatarUploader";
import PosthogTrackers from "../../PosthogTrackers";
import EmbeddedPage from "./EmbeddedPage";

const onClickSendDm = (ev: ButtonEvent) => {
    PosthogTrackers.trackInteraction("WebHomeCreateChatButton", ev);
    dis.dispatch({ action: "view_create_chat" });
};

const onClickExplore = (ev: ButtonEvent) => {
    PosthogTrackers.trackInteraction("WebHomeExploreRoomsButton", ev);
    dis.fire(Action.ViewRoomDirectory);
};

const onClickNewRoom = (ev: ButtonEvent) => {
    PosthogTrackers.trackInteraction("WebHomeCreateRoomButton", ev);
    dis.dispatch({ action: "view_create_room" });
};

interface IProps {
    justRegistered?: boolean;
}

const getOwnProfile = (userId: string) => ({
    displayName: OwnProfileStore.instance.displayName || userId,
    avatarUrl: OwnProfileStore.instance.getHttpAvatarUrl(AVATAR_SIZE),
});

const UserWelcomeTop = () => {
    const cli = useContext(MatrixClientContext);
    const userId = cli.getUserId();
    const [ownProfile, setOwnProfile] = useState(getOwnProfile(userId));
    useEventEmitter(OwnProfileStore.instance, UPDATE_EVENT, () => {
        setOwnProfile(getOwnProfile(userId));
    });

    return (
        <div>
            <MiniAvatarUploader
                hasAvatar={!!ownProfile.avatarUrl}
                hasAvatarLabel={_tDom("Great, that'll help people know it's you")}
                noAvatarLabel={_tDom("Add a photo so people know it's you.")}
                setAvatarUrl={(url) => cli.setAvatarUrl(url)}
                isUserAvatar
                onClick={(ev) => PosthogTrackers.trackInteraction("WebHomeMiniAvatarUploadButton", ev)}
            >
                <BaseAvatar
                    idName={userId}
                    name={ownProfile.displayName}
                    url={ownProfile.avatarUrl}
                    width={AVATAR_SIZE}
                    height={AVATAR_SIZE}
                    resizeMethod="crop"
                />
            </MiniAvatarUploader>

            <h1>{_tDom("Welcome %(name)s", { name: ownProfile.displayName })}</h1>
            <h2>{_tDom("Now, let's help you get started")}</h2>
        </div>
    );
};

const HomePage: React.FC<IProps> = ({ justRegistered = false }) => {
    const config = SdkConfig.get();
    const pageUrl = getHomePageUrl(config);

    if (pageUrl) {
        return <EmbeddedPage className="mx_HomePage" url={pageUrl} scrollbar={true} />;
    }

    let introSection: JSX.Element;
    if (justRegistered || !OwnProfileStore.instance.getHttpAvatarUrl(AVATAR_SIZE)) {
        introSection = <UserWelcomeTop />;
    } else {
        const brandingConfig = SdkConfig.getObject("branding");
        const logoUrl = brandingConfig?.get("auth_header_logo_url") ?? "themes/element/img/logos/element-logo.svg";

        introSection = (
            <React.Fragment>
                <img src={logoUrl} alt={config.brand} />
                <h1>{_tDom("Welcome to %(appName)s", { appName: config.brand })}</h1>
                <h2>{_tDom("Own your conversations.")}</h2>
            </React.Fragment>
        );
    }

    return (
        <AutoHideScrollbar className="mx_HomePage mx_HomePage_default" element="main">
            <div className="mx_HomePage_default_wrapper">
                {introSection}
                <div className="mx_HomePage_default_buttons">
                    <AccessibleButton onClick={onClickSendDm} className="mx_HomePage_button_sendDm">
                        {_tDom("Send a Direct Message")}
                    </AccessibleButton>
                    <AccessibleButton onClick={onClickExplore} className="mx_HomePage_button_explore">
                        {_tDom("Explore Public Rooms")}
                    </AccessibleButton>
                    <AccessibleButton onClick={onClickNewRoom} className="mx_HomePage_button_createGroup">
                        {_tDom("Create a Group Chat")}
                    </AccessibleButton>
                </div>
            </div>
        </AutoHideScrollbar>
    );
};

export default HomePage;
