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

import AgentPost from '@agents/components/agent_post';
import {isAgentPost} from '@agents/utils';
import React, {type ReactNode, useCallback, useEffect, useMemo, useRef, useState} from 'react';
import {useIntl} from 'react-intl';
import {Platform, type StyleProp, View, type ViewStyle, TouchableHighlight, type LayoutChangeEvent} from 'react-native';
import {KeyboardController} from 'react-native-keyboard-controller';

import {removePost} from '@actions/local/post';
import {showPermalink} from '@actions/remote/permalink';
import {fetchAndSwitchToThread} from '@actions/remote/thread';
import CallsCustomMessage from '@calls/components/calls_custom_message';
import {isCallsCustomMessage} from '@calls/utils';
import UnrevealedBurnOnReadPost from '@components/post_list/post/burn_on_read/unrevealed';
import SystemAvatar from '@components/system_avatar';
import SystemHeader from '@components/system_header';
import {POST_TIME_TO_FAIL} from '@constants/post';
import * as Screens from '@constants/screens';
import {useKeyboardAnimationContext} from '@context/keyboard_animation';
import {useServerUrl} from '@context/server';
import {useTheme} from '@context/theme';
import {useIsTablet} from '@hooks/device';
import useDidMount from '@hooks/did_mount';
import PerformanceMetricsManager from '@managers/performance_metrics_manager';
import {openAsBottomSheet} from '@screens/navigation';
import {isBoRPost, isUnrevealedBoRPost} from '@utils/bor';
import {hasJumboEmojiOnly} from '@utils/emoji/helpers';
import {fromAutoResponder, isFromWebhook, isPostFailed, isPostPendingOrFailed, isSystemMessage} from '@utils/post';
import {changeOpacity, makeStyleSheetFromTheme} from '@utils/theme';

import Avatar from './avatar';
import Body from './body';
import Footer from './footer';
import Header from './header';
import PreHeader from './pre_header';
import ShimmerAnimation from './shimmer_animation';
import SystemMessage from './system_message';
import UnreadDot from './unread_dot';
import useShimmerAnimation from './use_shimmer_animation';

import type PostModel from '@typings/database/models/servers/post';
import type ThreadModel from '@typings/database/models/servers/thread';
import type UserModel from '@typings/database/models/servers/user';
import type {SearchPattern} from '@typings/global/markdown';
import type {AvailableScreens} from '@typings/screens/navigation';

type PostProps = {
    appsEnabled: boolean;
    canDelete: boolean;
    currentUser?: UserModel;
    customEmojiNames: string[];
    differentThreadSequence: boolean;
    hasFiles: boolean;
    hasReplies: boolean;
    highlight?: boolean;
    highlightPinnedOrSaved?: boolean;
    highlightReplyBar: boolean;
    isConsecutivePost?: boolean;
    isCRTEnabled?: boolean;
    isEphemeral: boolean;
    isFirstReply?: boolean;
    isPostAcknowledgementEnabled?: boolean;
    isSaved?: boolean;
    isLastReply?: boolean;
    isPostAddChannelMember: boolean;
    isPostPriorityEnabled: boolean;
    location: AvailableScreens;
    post: PostModel;
    rootId?: string;
    previousPost?: PostModel;
    isLastPost: boolean;
    hasReactions: boolean;
    searchPatterns?: SearchPattern[];
    shouldRenderReplyButton?: boolean;
    showAddReaction?: boolean;
    skipSavedHeader?: boolean;
    skipPinnedHeader?: boolean;
    style?: StyleProp<ViewStyle>;
    testID?: string;
    thread?: ThreadModel;
    isChannelAutotranslated: boolean;
};

const getStyleSheet = makeStyleSheetFromTheme((theme: Theme) => {
    return {
        consecutive: {marginTop: 0},
        consecutivePostContainer: {
            marginBottom: 10,
            marginRight: 10,
            marginLeft: Platform.select({ios: 34, android: 33}),
            marginTop: 10,
        },
        container: {flexDirection: 'row'},
        highlight: {backgroundColor: changeOpacity(theme.mentionHighlightBg, 0.5)},
        highlightBar: {
            backgroundColor: theme.mentionHighlightBg,
            opacity: 1,
        },
        highlightPinnedOrSaved: {
            backgroundColor: changeOpacity(theme.mentionHighlightBg, 0.2),
        },
        pendingPost: {opacity: 0.5},
        postContent: {paddingHorizontal: 16},
        postStyle: {
            overflow: 'hidden',
            flex: 1,
        },
        profilePictureContainer: {
            marginBottom: 5,
            marginRight: 10,
            marginTop: 10,
        },
        rightColumn: {
            flex: 1,
            flexDirection: 'column',
        },
        rightColumnPadding: {paddingBottom: 3},
    };
});

const Post = ({
    appsEnabled,
    canDelete,
    currentUser,
    customEmojiNames,
    differentThreadSequence,
    hasFiles,
    hasReplies,
    highlight,
    highlightPinnedOrSaved = true,
    highlightReplyBar,
    isCRTEnabled,
    isConsecutivePost,
    isEphemeral,
    isFirstReply,
    isSaved,
    isLastReply,
    isPostAcknowledgementEnabled,
    isPostAddChannelMember,
    isPostPriorityEnabled,
    location,
    post,
    rootId,
    hasReactions,
    searchPatterns,
    shouldRenderReplyButton,
    skipSavedHeader,
    skipPinnedHeader,
    showAddReaction = true,
    style,
    testID,
    thread,
    previousPost,
    isLastPost,
    isChannelAutotranslated,
}: PostProps) => {
    const pressDetected = useRef(false);
    const intl = useIntl();
    const serverUrl = useServerUrl();
    const theme = useTheme();
    const isTablet = useIsTablet();
    const {blurAndDismissKeyboard, closeInputAccessoryView, showInputAccessoryView} = useKeyboardAnimationContext();
    const styles = getStyleSheet(theme);
    const isAutoResponder = fromAutoResponder(post);
    const isPendingOrFailed = isPostPendingOrFailed(post);
    const isFailed = isPostFailed(post);
    const isSystemPost = isSystemMessage(post);
    const isCallsPost = isCallsCustomMessage(post);
    const borPost = isBoRPost(post);
    const isUnrevealedPost = isUnrevealedBoRPost(post);
    const isOwnPost = Boolean(currentUser && post.userId === currentUser.id);
    const isAgentPostType = isAgentPost(post);
    const hasBeenDeleted = (post.deleteAt !== 0);
    const isWebHook = isFromWebhook(post);
    const [layoutWidth, setLayoutWidth] = useState(0);
    const shimmerAnimationProps = useShimmerAnimation(post, isChannelAutotranslated, intl.locale, layoutWidth, theme);
    const hasSameRoot = useMemo(() => {
        if (isFirstReply) {
            return false;
        } else if (!post.rootId && !previousPost?.rootId && isConsecutivePost) {
            return true;
        } else if (post.rootId) {
            return true;
        }

        return false;
    }, [isConsecutivePost, post, previousPost, isFirstReply]);
    const isJumboEmoji = useMemo(() => {
        if (post.message.length && !(/^\s{4}/).test(post.message)) {
            return hasJumboEmojiOnly(post.message, customEmojiNames);
        }
        return false;
    }, [customEmojiNames, post.message]);

    const handlePostPress = useCallback(async () => {
        if ([Screens.SAVED_MESSAGES, Screens.MENTIONS, Screens.SEARCH, Screens.PINNED_MESSAGES].includes(location)) {
            showPermalink(serverUrl, '', post.id);
            return;
        }

        const isValidSystemMessage = isAutoResponder || !isSystemPost;
        if (isEphemeral || hasBeenDeleted) {
            removePost(serverUrl, post);
        } else if (isValidSystemMessage && !hasBeenDeleted && !isPendingOrFailed) {
            // BoR posts cannot have replies, so don't open threads screen for them
            if (!borPost && [Screens.CHANNEL, Screens.PERMALINK].includes(location)) {
                await blurAndDismissKeyboard();
                const postRootId = post.rootId || post.id;
                fetchAndSwitchToThread(serverUrl, postRootId);
            }
        }

        setTimeout(() => {
            pressDetected.current = false;
        }, 300);
    }, [location, isAutoResponder, isSystemPost, isEphemeral, hasBeenDeleted, isPendingOrFailed, serverUrl, post, borPost, blurAndDismissKeyboard]);

    const handlePress = useCallback(() => {
        if (isBoRPost(post)) {
            return;
        }

        pressDetected.current = true;

        KeyboardController.dismiss();

        if (post) {
            setTimeout(handlePostPress, 300);
        }
    }, [handlePostPress, post]);

    const showPostOptions = useCallback(async () => {
        if (!post) {
            return;
        }

        if (isSystemPost && (!canDelete || hasBeenDeleted)) {
            return;
        }

        if (isPendingOrFailed || isEphemeral) {
            return;
        }

        if (showInputAccessoryView) {
            closeInputAccessoryView();
        }

        await blurAndDismissKeyboard();
        const passProps = {sourceScreen: location, post, showAddReaction, serverUrl};
        const title = isTablet ? intl.formatMessage({id: 'post.options.title', defaultMessage: 'Options'}) : '';

        openAsBottomSheet({
            closeButtonId: 'close-post-options',
            screen: Screens.POST_OPTIONS,
            theme,
            title,
            props: passProps,
        });
    }, [post, isSystemPost, canDelete, hasBeenDeleted, isPendingOrFailed, isEphemeral, blurAndDismissKeyboard, closeInputAccessoryView, showInputAccessoryView, location, showAddReaction, serverUrl, isTablet, intl, theme]);

    const [, rerender] = useState(false);
    useEffect(() => {
        let t: NodeJS.Timeout|undefined;
        if (post.pendingPostId === post.id && !isFailed) {
            t = setTimeout(() => rerender(true), POST_TIME_TO_FAIL - (Date.now() - post.updateAt));
        }

        return () => {
            if (t) {
                clearTimeout(t);
            }
        };

    // Timer only needs to reset when post.id changes, not on other prop updates
    // eslint-disable-next-line react-hooks/exhaustive-deps
    }, [post.id]);

    useDidMount(() => {
        if (!isLastPost) {
            return;
        }

        if (location !== 'Channel' && location !== 'Thread') {
            return;
        }

        PerformanceMetricsManager.finishLoad(location === 'Thread' ? 'THREAD' : 'CHANNEL', serverUrl);
        PerformanceMetricsManager.endMetric('mobile_channel_switch', serverUrl);
    });

    const onLayout = useCallback((e: LayoutChangeEvent) => {
        setLayoutWidth(e.nativeEvent.layout.width);
    }, []);

    const highlightSaved = isSaved && !skipSavedHeader;
    const hightlightPinned = post.isPinned && !skipPinnedHeader;
    const itemTestID = `${testID}.${post.id}`;
    const rightColumnStyle: StyleProp<ViewStyle> = [styles.rightColumn, (Boolean(post.rootId) && isLastReply && styles.rightColumnPadding)];
    const pendingPostStyle: StyleProp<ViewStyle> | undefined = isPendingOrFailed ? styles.pendingPost : undefined;

    let highlightedStyle: StyleProp<ViewStyle>;
    if (highlight) {
        highlightedStyle = styles.highlight;
    } else if ((highlightSaved || hightlightPinned) && highlightPinnedOrSaved) {
        highlightedStyle = styles.highlightPinnedOrSaved;
    }

    let header: ReactNode;
    let postAvatar: ReactNode;
    let consecutiveStyle: StyleProp<ViewStyle>;

    // If the post is a priority post:
    // 1. Show the priority label in channel screen
    // 2. Show the priority label in thread screen for the root post
    const showPostPriority = Boolean(isPostPriorityEnabled && post.metadata?.priority?.priority) && (location !== Screens.THREAD || !post.rootId);

    const sameSequence = hasReplies ? (hasReplies && post.rootId) : !post.rootId;
    if (!showPostPriority && hasSameRoot && isConsecutivePost && sameSequence) {
        consecutiveStyle = styles.consecutive;
        postAvatar = <View style={styles.consecutivePostContainer}/>;
    } else {
        postAvatar = (
            <View style={[styles.profilePictureContainer, pendingPostStyle]}>
                {(isAutoResponder || isSystemPost) ? (
                    <SystemAvatar theme={theme}/>
                ) : (
                    <Avatar
                        isAutoReponse={isAutoResponder}
                        location={location}
                        post={post}
                    />
                )}
            </View>
        );

        if (isSystemPost && !isAutoResponder) {
            header = (
                <SystemHeader
                    createAt={post.createAt}
                    theme={theme}
                    isEphemeral={isEphemeral}
                />
            );
        } else {
            header = (
                <Header
                    currentUser={currentUser}
                    differentThreadSequence={differentThreadSequence}
                    isAutoResponse={isAutoResponder}
                    isCRTEnabled={isCRTEnabled}
                    isEphemeral={isEphemeral}
                    isPendingOrFailed={isPendingOrFailed}
                    isSystemPost={isSystemPost}
                    isWebHook={isWebHook}
                    location={location}
                    post={post}
                    showPostPriority={showPostPriority}
                    shouldRenderReplyButton={shouldRenderReplyButton}
                    isChannelAutotranslated={isChannelAutotranslated}
                />
            );
        }
    }

    let body;
    if (isSystemPost && !isEphemeral && !isAutoResponder) {
        body = (
            <SystemMessage
                location={location}
                post={post}
            />
        );
    } else if (isCallsPost && !hasBeenDeleted) {
        body = (
            <CallsCustomMessage
                serverUrl={serverUrl}
                post={post}

                // Note: the below are provided by the index, but typescript seems to be having problems.
                otherParticipants={false}
                isAdmin={false}
                isHost={false}
                joiningChannelId={null}
            />
        );
    } else if (isUnrevealedPost && !isOwnPost) {
        body = (
            <UnrevealedBurnOnReadPost post={post}/>
        );
    } else if (isAgentPostType && !hasBeenDeleted) {
        body = (
            <AgentPost
                post={post}
                currentUserId={currentUser?.id}
                location={location}
            />
        );
    } else {
        body = (
            <Body
                appsEnabled={appsEnabled}
                hasFiles={hasFiles}
                hasReactions={hasReactions}
                highlight={Boolean(highlightedStyle)}
                highlightReplyBar={highlightReplyBar}
                isCRTEnabled={isCRTEnabled}
                isEphemeral={isEphemeral}
                isFirstReply={isFirstReply}
                isJumboEmoji={isJumboEmoji}
                isLastReply={isLastReply}
                isPendingOrFailed={isPendingOrFailed}
                isPostAcknowledgementEnabled={isPostAcknowledgementEnabled}
                isPostAddChannelMember={isPostAddChannelMember}
                location={location}
                post={post}
                searchPatterns={searchPatterns}
                showAddReaction={showAddReaction}
                theme={theme}
                isChannelAutotranslated={isChannelAutotranslated}
            />
        );
    }

    let unreadDot;
    let footer;
    if (isCRTEnabled && thread && location !== Screens.THREAD && !(rootId && location === Screens.PERMALINK)) {
        if (thread.replyCount > 0 || thread.isFollowing) {
            footer = (
                <Footer
                    channelId={post.channelId}
                    location={location}
                    thread={thread}
                />
            );
        }
        if (thread.unreadMentions || thread.unreadReplies) {
            unreadDot = (
                <UnreadDot/>
            );
        }
    }

    return (
        <View
            testID={testID}
            style={[styles.postStyle, style, highlightedStyle]}
            onLayout={onLayout}
        >
            <TouchableHighlight
                testID={itemTestID}
                onPress={handlePress}
                onLongPress={showPostOptions}
                delayLongPress={200}
                underlayColor={changeOpacity(theme.centerChannelColor, 0.1)}
                style={styles.postContent}
            >
                <>
                    <PreHeader
                        isConsecutivePost={isConsecutivePost}
                        isSaved={isSaved}
                        isPinned={post.isPinned}
                        skipSavedHeader={skipSavedHeader}
                        skipPinnedHeader={skipPinnedHeader}
                    />
                    <View style={[styles.container, consecutiveStyle]}>
                        {postAvatar}
                        <View style={rightColumnStyle}>
                            {header}
                            {body}
                            {footer}
                        </View>
                        {unreadDot}
                    </View>
                </>
            </TouchableHighlight>
            <ShimmerAnimation {...shimmerAnimationProps}/>
        </View>
    );
};

export default Post;