// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

import type {AnyAction} from 'redux';
import {batchActions} from 'redux-batched-actions';

import type {WebSocketMessages} from '@mattermost/client';
import type {FileInfo} from '@mattermost/types/files';
import type {Post} from '@mattermost/types/posts';
import type {ScheduledPost} from '@mattermost/types/schedule_post';

import {SearchTypes} from 'mattermost-redux/action_types';
import {getMyChannelMember} from 'mattermost-redux/actions/channels';
import * as PostActions from 'mattermost-redux/actions/posts';
import {createSchedulePost} from 'mattermost-redux/actions/scheduled_posts';
import * as ThreadActions from 'mattermost-redux/actions/threads';
import {getChannel, getMyChannelMember as getMyChannelMemberSelector} from 'mattermost-redux/selectors/entities/channels';
import {makeGetFilesForPost} from 'mattermost-redux/selectors/entities/files';
import {getConfig} from 'mattermost-redux/selectors/entities/general';
import * as PostSelectors from 'mattermost-redux/selectors/entities/posts';
import {isCollapsedThreadsEnabled} from 'mattermost-redux/selectors/entities/preferences';
import {getCurrentTeamId} from 'mattermost-redux/selectors/entities/teams';
import {getCurrentUserId, isCurrentUserSystemAdmin} from 'mattermost-redux/selectors/entities/users';
import {canEditPost, comparePosts} from 'mattermost-redux/utils/post_utils';

import {addRecentEmoji, addRecentEmojis} from 'actions/emoji_actions';
import {setGlobalItem} from 'actions/storage';
import * as StorageActions from 'actions/storage';
import {loadNewDMIfNeeded, loadNewGMIfNeeded} from 'actions/user_actions';
import {removeDraft} from 'actions/views/drafts';
import {closeModal, openModal} from 'actions/views/modals';
import * as RhsActions from 'actions/views/rhs';
import {manuallyMarkThreadAsUnread} from 'actions/views/threads';
import {getConnectionId} from 'selectors/general';
import {isEmbedVisible, isInlineImageVisible} from 'selectors/posts';
import {getSelectedPostId, getSelectedPostCardId, getRhsState} from 'selectors/rhs';
import {getGlobalItem} from 'selectors/storage';

import ReactionLimitReachedModal from 'components/reaction_limit_reached_modal';

import {
    ActionTypes,
    Constants,
    ModalIdentifiers,
    RHSStates,
    StoragePrefixes,
} from 'utils/constants';
import {matchEmoticons} from 'utils/emoticons';
import {makeGetIsReactionAlreadyAddedToPost, makeGetUniqueEmojiNameReactionsForPost} from 'utils/post_utils';

import type {
    GlobalState,
    DispatchFunc,
    ActionFunc,
    ActionFuncAsync,
    ThunkActionFunc,
} from 'types/store';
import type {PostDraft} from 'types/store/draft';
import type {StorageItem} from 'types/store/storage';

import {completePostReceive} from './new_post';
import type {OnSubmitOptions, SubmitPostReturnType} from './views/create_comment';

export type CreatePostOptions = {
    keepDraft?: boolean;
    ignorePostError?: boolean;
};

export function handleNewPost(post: Post, msg?: WebSocketMessages.Posted | WebSocketMessages.EphemeralPost): ActionFuncAsync<boolean> {
    return async (dispatch, getState) => {
        let websocketMessageProps = {};
        const state = getState();
        if (msg) {
            websocketMessageProps = msg.data!;
        }

        const myChannelMember = getMyChannelMemberSelector(state, post.channel_id);
        const myChannelMemberDoesntExist = !myChannelMember || (Object.keys(myChannelMember).length === 0 && myChannelMember.constructor === Object);

        if (myChannelMemberDoesntExist) {
            await dispatch(getMyChannelMember(post.channel_id));
        }

        dispatch(completePostReceive(post, websocketMessageProps, myChannelMemberDoesntExist));

        if (msg && msg.data && 'channel_type' in msg.data) {
            if (msg.data.channel_type === Constants.DM_CHANNEL) {
                dispatch(loadNewDMIfNeeded(post.channel_id));
            } else if (msg.data.channel_type === Constants.GM_CHANNEL) {
                dispatch(loadNewGMIfNeeded(post.channel_id));
            }
        }

        return {data: true};
    };
}

const getPostsForIds = PostSelectors.makeGetPostsForIds();

export function flagPost(postId: string): ActionFuncAsync {
    return async (dispatch, getState) => {
        await dispatch(PostActions.flagPost(postId));
        const state = getState();
        const rhsState = getRhsState(state);

        if (rhsState === RHSStates.FLAG) {
            dispatch(addPostToSearchResults(postId));
        }

        return {data: true};
    };
}

export function unflagPost(postId: string): ActionFuncAsync {
    return async (dispatch, getState) => {
        await dispatch(PostActions.unflagPost(postId));
        const state = getState();
        const rhsState = getRhsState(state);

        if (rhsState === RHSStates.FLAG) {
            removePostFromSearchResults(postId, state, dispatch);
        }

        return {data: true};
    };
}

function addRecentEmojisForMessage(message: string): ActionFunc {
    return (dispatch) => {
        // parse message and emit emoji event
        const emojis = matchEmoticons(message);
        if (emojis) {
            const trimmedEmojis = emojis.map((emoji) => emoji.substring(1, emoji.length - 1));
            dispatch(addRecentEmojis(trimmedEmojis));
        }
        return {data: true};
    };
}

export function createPost(
    post: Post,
    files: FileInfo[],
    afterSubmit?: (response: SubmitPostReturnType) => void,
    options?: OnSubmitOptions,
): ActionFuncAsync<PostActions.CreatePostReturnType> {
    return async (dispatch) => {
        dispatch(addRecentEmojisForMessage(post.message));

        const result = await dispatch(PostActions.createPost(post, files, afterSubmit));

        if (!options?.keepDraft) {
            if (post.root_id) {
                dispatch(storeCommentDraft(post.root_id, null));
            } else {
                dispatch(storeDraft(post.channel_id, null));
            }
        }

        options?.afterOptimisticSubmit?.();
        return result;
    };
}

export function createSchedulePostFromDraft(scheduledPost: ScheduledPost): ActionFuncAsync<PostActions.CreatePostReturnType> {
    return async (dispatch, getState) => {
        dispatch(addRecentEmojisForMessage(scheduledPost.message));

        const state = getState();
        const connectionId = getConnectionId(state);
        const channel = state.entities.channels.channels[scheduledPost.channel_id];
        const result = await dispatch(createSchedulePost(scheduledPost, channel.team_id, connectionId));

        return {
            created: !result.error && result.data,
            error: result.error,
        };
    };
}

function storeDraft(channelId: string, draft: null): ActionFunc {
    return (dispatch) => {
        dispatch(StorageActions.setGlobalItem('draft_' + channelId, draft));
        return {data: true};
    };
}

function storeCommentDraft(rootPostId: string, draft: null): ActionFunc {
    return (dispatch) => {
        dispatch(StorageActions.setGlobalItem('comment_draft_' + rootPostId, draft));
        return {data: true};
    };
}

export function submitReaction(postId: string, action: string, emojiName: string): ActionFuncAsync<PostActions.SubmitReactionReturnType> {
    return async (dispatch, getState) => {
        const state = getState();
        const getIsReactionAlreadyAddedToPost = makeGetIsReactionAlreadyAddedToPost();

        const isReactionAlreadyAddedToPost = getIsReactionAlreadyAddedToPost(state, postId, emojiName);

        if (action === '+' && !isReactionAlreadyAddedToPost) {
            return dispatch(addReaction(postId, emojiName));
        } else if (action === '-' && isReactionAlreadyAddedToPost) {
            return dispatch(PostActions.removeReaction(postId, emojiName));
        }
        return {error: new Error(`unknown action ${action}`)};
    };
}

export function toggleReaction(postId: string, emojiName: string): ActionFuncAsync<PostActions.SubmitReactionReturnType> {
    return async (dispatch, getState) => {
        const state = getState();
        const getIsReactionAlreadyAddedToPost = makeGetIsReactionAlreadyAddedToPost();

        const isReactionAlreadyAddedToPost = getIsReactionAlreadyAddedToPost(state, postId, emojiName);

        if (isReactionAlreadyAddedToPost) {
            return dispatch(PostActions.removeReaction(postId, emojiName));
        }
        return dispatch(addReaction(postId, emojiName));
    };
}

export function addReaction(postId: string, emojiName: string): ActionFuncAsync<PostActions.SubmitReactionReturnType> {
    const getUniqueEmojiNameReactionsForPost = makeGetUniqueEmojiNameReactionsForPost();
    return async (dispatch, getState) => {
        const state = getState();
        const config = getConfig(state);
        const uniqueEmojiNames = getUniqueEmojiNameReactionsForPost(state, postId) ?? [];

        // If we're adding a new reaction but we're already at or over the limit, stop
        if (uniqueEmojiNames.length >= Number(config.UniqueEmojiReactionLimitPerPost) && !uniqueEmojiNames.some((name) => name === emojiName)) {
            dispatch(openModal({
                modalId: ModalIdentifiers.REACTION_LIMIT_REACHED,
                dialogType: ReactionLimitReachedModal,
                dialogProps: {
                    isAdmin: isCurrentUserSystemAdmin(state),
                    onExited: () => closeModal(ModalIdentifiers.REACTION_LIMIT_REACHED),
                },
            }));
            return {error: new Error('reached reaction limit')};
        }

        dispatch(addRecentEmoji(emojiName));
        const result = await dispatch(PostActions.addReaction(postId, emojiName));
        return result;
    };
}

export function searchForTerm(term: string): ActionFunc<boolean> {
    return (dispatch) => {
        dispatch(RhsActions.updateSearchTerms(term));
        dispatch(RhsActions.showSearchResults());
        return {data: true};
    };
}

function addPostToSearchResults(postId: string): ActionFunc {
    return (dispatch, getState) => {
        const state = getState();
        const results = state.entities.search.results;
        const index = results.indexOf(postId);
        if (index === -1) {
            const newPost = PostSelectors.getPost(state, postId);
            const posts = getPostsForIds(state, results).reduce((acc, post) => {
                acc[post.id] = post;
                return acc;
            }, {} as Record<string, Post>);
            posts[newPost.id] = newPost;

            const newResults = [...results, postId];
            newResults.sort((a, b) => comparePosts(posts[a], posts[b]));

            dispatch({
                type: SearchTypes.RECEIVED_SEARCH_POSTS,
                data: {posts, order: newResults},
            });
        }
        return {data: true};
    };
}

function removePostFromSearchResults(postId: string, state: GlobalState, dispatch: DispatchFunc) {
    let results = state.entities.search.results;
    const index = results.indexOf(postId);
    if (index > -1) {
        results = [...results];
        results.splice(index, 1);

        const posts = getPostsForIds(state, results);

        dispatch({
            type: SearchTypes.RECEIVED_SEARCH_POSTS,
            data: {posts, order: results},
        });
    }
}

export function pinPost(postId: string): ActionFuncAsync<boolean> {
    return async (dispatch, getState) => {
        await dispatch(PostActions.pinPost(postId));
        const state = getState();
        const rhsState = getRhsState(state);

        if (rhsState === RHSStates.PIN) {
            dispatch(addPostToSearchResults(postId));
        }
        return {data: true};
    };
}

export function unpinPost(postId: string): ActionFuncAsync<boolean> {
    return async (dispatch, getState) => {
        await dispatch(PostActions.unpinPost(postId));
        const state = getState();
        const rhsState = getRhsState(state);

        if (rhsState === RHSStates.PIN) {
            removePostFromSearchResults(postId, state, dispatch);
        }
        return {data: true};
    };
}

export function setEditingPost(postId = '', refocusId = '', isRHS = false): ActionFunc<boolean, GlobalState> {
    const getFilesForPost = makeGetFilesForPost();

    return (dispatch, getState) => {
        const state = getState();
        let post = PostSelectors.getPost(state, postId);

        // getPost selectors doesn't include post's file metadata, so we need to add it manually
        if (post.file_ids?.length) {
            // if the post has files, get their metadata and  insert it into the post object
            const files = getFilesForPost(state, postId);
            post = {...post, metadata: {...post.metadata, files}};
        }

        if (!post || post.pending_post_id === postId) {
            return {data: false};
        }

        const config = state.entities.general.config;
        const license = state.entities.general.license;
        const userId = getCurrentUserId(state);
        const channel = getChannel(state, post.channel_id);
        const teamId = channel?.team_id || '';

        const canEdit = canEditPost(state, config, license, teamId, post.channel_id, userId, post);

        if (!canEdit) {
            return {data: false};
        }

        const storageKey = `${StoragePrefixes.EDIT_DRAFT}${post.id}`;

        const actions: AnyAction[] = [{
            type: ActionTypes.TOGGLE_EDITING_POST,
            data: {postId, refocusId, isRHS, show: true},
        }];

        // We need to see if post's draft is already in store, if it is, we don't need to set it again
        const editDraftInStore = getGlobalItem(state, storageKey, null) as StorageItem<PostDraft>['value'] | null;

        if (
            !editDraftInStore ||
                (editDraftInStore &&
                    editDraftInStore?.message?.length === 0 &&
                    editDraftInStore?.fileInfos?.length === 0 &&
                    editDraftInStore?.uploadsInProgress?.length === 0
                )
        ) {
            actions.push(setGlobalItem(storageKey, post));
        }

        dispatch(batchActions(actions));

        return {data: true};
    };
}

export function unsetEditingPost(): ActionFunc<boolean, GlobalState> {
    return (dispatch, getState) => {
        const editingPostId = getState().views.posts.editingPost.postId;

        const actions: AnyAction[] = [{
            type: ActionTypes.TOGGLE_EDITING_POST,
            data: {
                show: false,
            },
        }];

        if (editingPostId) {
            const storageKey = `${StoragePrefixes.EDIT_DRAFT}${editingPostId}`;
            actions.push(StorageActions.removeGlobalItem(storageKey));
        }

        dispatch(batchActions(actions));

        return {data: true};
    };
}

export function markPostAsUnread(post: Post, location?: string): ActionFuncAsync {
    return async (dispatch, getState) => {
        const state = getState();
        const userId = getCurrentUserId(state);
        const currentTeamId = getCurrentTeamId(state);

        // if CRT:ON and this is from within ThreadViewer (e.g. post dot-menu), mark the thread as unread and followed
        if (isCollapsedThreadsEnabled(state) && (location === 'RHS_ROOT' || location === 'RHS_COMMENT')) {
            const threadId = post.root_id || post.id;
            ThreadActions.handleFollowChanged(dispatch, threadId, currentTeamId, true);
            dispatch(manuallyMarkThreadAsUnread(threadId, post.create_at - 1));
            await dispatch(ThreadActions.markThreadAsUnread(userId, currentTeamId, threadId, post.id));
        } else {
            // use normal channel unread system
            await dispatch(PostActions.setUnreadPost(userId, post.id));
        }

        return {data: true};
    };
}

export function markMostRecentPostInChannelAsUnread(channelId: string): ActionFuncAsync {
    return async (dispatch, getState) => {
        let state = getState();
        let postId = PostSelectors.getMostRecentNonSystemPostIdInChannel(state, channelId);
        if (!postId) {
            await dispatch(PostActions.getPosts(channelId));
            state = getState();
            postId = PostSelectors.getMostRecentNonSystemPostIdInChannel(state, channelId);
        }
        if (postId) {
            const lastPost = PostSelectors.getPost(state, postId);
            dispatch(markPostAsUnread(lastPost, 'CENTER'));
        }
        return {data: true};
    };
}

// Action called by DeletePostModal when the post is deleted
export function deleteAndRemovePost(post: Post): ActionFuncAsync<boolean> {
    return async (dispatch, getState) => {
        const {error} = await dispatch(PostActions.deletePost(post));
        if (error) {
            return {error};
        }

        if (post.id === getSelectedPostId(getState())) {
            dispatch({
                type: ActionTypes.SELECT_POST,
                postId: '',
                channelId: '',
                timestamp: 0,
            });
        }

        if (post.id === getSelectedPostCardId(getState())) {
            dispatch({
                type: ActionTypes.SELECT_POST_CARD,
                postId: '',
                channelId: '',
            });
        }

        if (post.root_id === '') {
            const key = StoragePrefixes.COMMENT_DRAFT + post.id;
            if (getGlobalItem(getState(), key, null)) {
                dispatch(removeDraft(key, post.channel_id, post.id));
            }
        }

        dispatch(PostActions.removePost(post));

        return {data: true};
    };
}

export function toggleEmbedVisibility(postId: string): ThunkActionFunc<void> {
    return (dispatch, getState) => {
        const state = getState();
        const currentUserId = getCurrentUserId(state);
        const visible = isEmbedVisible(state, postId);

        dispatch(StorageActions.setGlobalItem(StoragePrefixes.EMBED_VISIBLE + currentUserId + '_' + postId, !visible));
    };
}

export function resetEmbedVisibility() {
    return StorageActions.actionOnGlobalItemsWithPrefix(StoragePrefixes.EMBED_VISIBLE, () => null);
}

export function toggleInlineImageVisibility(postId: string, imageKey: string): ThunkActionFunc<void> {
    return (dispatch, getState) => {
        const state = getState();
        const currentUserId = getCurrentUserId(state);
        const visible = isInlineImageVisible(state, postId, imageKey);

        dispatch(StorageActions.setGlobalItem(StoragePrefixes.INLINE_IMAGE_VISIBLE + currentUserId + '_' + postId + '_' + imageKey, !visible));
    };
}

export function resetInlineImageVisibility() {
    return StorageActions.actionOnGlobalItemsWithPrefix(StoragePrefixes.INLINE_IMAGE_VISIBLE, () => null);
}

/*
 * It is called from either center or rhs text input when shortcut for react to last message is pressed
 *
 * @param {string} emittedFrom - It can be either "CENTER", "RHS_ROOT" or "NO_WHERE"
 */
export function emitShortcutReactToLastPostFrom(emittedFrom: keyof typeof Constants.Locations) {
    return {
        type: ActionTypes.EMITTED_SHORTCUT_REACT_TO_LAST_POST,
        payload: emittedFrom,
    };
}