import React from 'react';
import Author from 'app/components/elements/Author';
import ReplyEditor from 'app/components/elements/ReplyEditor';
import MarkdownViewer from 'app/components/cards/MarkdownViewer';
import shouldComponentUpdate from 'app/utils/shouldComponentUpdate';
import Voting from 'app/components/elements/Voting';
import { connect } from 'react-redux';
import { Link } from 'react-router';
import * as userActions from 'app/redux/UserReducer';
import TimeAgoWrapper from 'app/components/elements/TimeAgoWrapper';
import Userpic from 'app/components/elements/Userpic';
import * as transactionActions from 'app/redux/TransactionReducer';
import tt from 'counterpart';
import { parsePayoutAmount } from 'app/utils/ParsersAndFormatters';
import { Long } from 'bytebuffer';
import ImageUserBlockList from 'app/utils/ImageUserBlockList';

// returns true if the comment has a 'hide' flag AND has no descendants w/ positive payout
function hideSubtree(cont, c) {
    return cont.getIn([c, 'stats', 'hide']) && !hasPositivePayout(cont, c);
}

function hasPositivePayout(cont, c) {
    const post = cont.get(c);
    if (post.getIn(['stats', 'hasPendingPayout'])) {
        return true;
    }
    if (post.get('replies').find(reply => hasPositivePayout(cont, reply))) {
        return true;
    }
    return false;
}

export function sortComments(cont, comments, sort_order) {
    function netNegative(a) {
        return a.get('net_rshares') < 0;
    }
    function totalPayout(a) {
        return (
            parsePayoutAmount(a.get('pending_payout_value')) +
            parsePayoutAmount(a.get('total_payout_value')) +
            parsePayoutAmount(a.get('curator_payout_value'))
        );
    }
    function netRshares(a) {
        return Long.fromString(String(a.get('net_rshares')));
    }
    function countUpvotes(a) {
        return a.get('active_votes').filter(vote => vote.get('percent') > 0)
            .size;
    }

    /** sorts replies by upvotes, age, or payout */
    const sort_orders = {
        votes: (a, b) => {
            const aactive = countUpvotes(cont.get(a));
            const bactive = countUpvotes(cont.get(b));
            return bactive - aactive;
        },
        new: (a, b) => {
            const acontent = cont.get(a);
            const bcontent = cont.get(b);
            if (netNegative(acontent)) {
                return 1;
            } else if (netNegative(bcontent)) {
                return -1;
            }
            const aactive = Date.parse(acontent.get('created'));
            const bactive = Date.parse(bcontent.get('created'));
            return bactive - aactive;
        },
        trending: (a, b) => {
            const acontent = cont.get(a);
            const bcontent = cont.get(b);
            if (netNegative(acontent)) {
                return 1;
            } else if (netNegative(bcontent)) {
                return -1;
            }
            const apayout = totalPayout(acontent);
            const bpayout = totalPayout(bcontent);
            if (apayout !== bpayout) {
                return bpayout - apayout;
            }
            // If SBD payouts were equal, fall back to rshares sorting
            return netRshares(bcontent).compare(netRshares(acontent));
        },
    };
    comments.sort(sort_orders[sort_order]);
}

class CommentImpl extends React.Component {
    static propTypes = {
        // html props
        cont: React.PropTypes.object.isRequired,
        content: React.PropTypes.string.isRequired,
        sort_order: React.PropTypes.oneOf(['votes', 'new', 'trending'])
            .isRequired,
        root: React.PropTypes.bool,
        showNegativeComments: React.PropTypes.bool,
        onHide: React.PropTypes.func,
        noImage: React.PropTypes.bool,

        // component props (for recursion)
        depth: React.PropTypes.number,

        // redux props
        username: React.PropTypes.string,
        rootComment: React.PropTypes.string,
        anchor_link: React.PropTypes.string.isRequired,
        deletePost: React.PropTypes.func.isRequired,
    };
    static defaultProps = {
        depth: 1,
    };

    constructor() {
        super();
        this.state = { collapsed: false, hide_body: false, highlight: false };
        this.revealBody = this.revealBody.bind(this);
        this.shouldComponentUpdate = shouldComponentUpdate(this, 'Comment');
        this.onShowReply = () => {
            const { showReply } = this.state;
            this.setState({ showReply: !showReply, showEdit: false });
            this.saveOnShow(!showReply ? 'reply' : null);
        };
        this.onShowEdit = () => {
            const { showEdit } = this.state;
            this.setState({ showEdit: !showEdit, showReply: false });
            this.saveOnShow(!showEdit ? 'edit' : null);
        };
        this.saveOnShow = type => {
            if (process.env.BROWSER) {
                const { cont } = this.props;
                const content = cont.get(this.props.content);
                const formId =
                    content.get('author') + '/' + content.get('permlink');
                if (type)
                    localStorage.setItem(
                        'showEditor-' + formId,
                        JSON.stringify({ type }, null, 0)
                    );
                else {
                    localStorage.removeItem('showEditor-' + formId);
                    localStorage.removeItem(
                        'replyEditorData-' + formId + '-reply'
                    );
                    localStorage.removeItem(
                        'replyEditorData-' + formId + '-edit'
                    );
                }
            }
        };
        this.saveOnShow = this.saveOnShow.bind(this);
        this.onDeletePost = () => {
            const { props: { deletePost } } = this;
            const content = this.props.cont.get(this.props.content);
            deletePost(content.get('author'), content.get('permlink'));
        };
        this.toggleCollapsed = this.toggleCollapsed.bind(this);
    }

    componentWillMount() {
        this.initEditor(this.props);
        this._checkHide(this.props);
    }

    componentDidMount() {
        if (window.location.hash == this.props.anchor_link) {
            this.setState({ highlight: true }); // eslint-disable-line react/no-did-mount-set-state
        }
    }

    /**
     * - `hide` is based on author reputation, and will hide the entire post on initial render.
     * - `hide_body` is true when comment rshares OR author rep is negative.
     *    it hides the comment body (but not the header) until the "reveal comment" link is clicked.
     */
    _checkHide(props) {
        const content = props.cont.get(props.content);
        if (content) {
            const hide = hideSubtree(props.cont, props.content);
            const gray = content.getIn(['stats', 'gray']);
            if (hide) {
                const { onHide } = this.props;
                // console.log('Comment --> onHide')
                if (onHide) onHide();
            }
            this.setState({ hide, hide_body: hide || gray });
        }
    }

    toggleCollapsed() {
        this.setState({ collapsed: !this.state.collapsed });
    }
    revealBody() {
        this.setState({ hide_body: false });
    }
    initEditor(props) {
        if (this.state.PostReplyEditor) return;
        const { cont } = this.props;
        const content = cont.get(props.content);
        if (!content) return;
        const post = content.get('author') + '/' + content.get('permlink');
        const PostReplyEditor = ReplyEditor(post + '-reply');
        const PostEditEditor = ReplyEditor(post + '-edit');
        if (process.env.BROWSER) {
            const formId = post;
            let showEditor = localStorage.getItem('showEditor-' + formId);
            if (showEditor) {
                showEditor = JSON.parse(showEditor);
                if (showEditor.type === 'reply') {
                    this.setState({ showReply: true });
                }
                if (showEditor.type === 'edit') {
                    this.setState({ showEdit: true });
                }
            }
        }
        this.setState({ PostReplyEditor, PostEditEditor });
    }
    render() {
        const { cont } = this.props;
        const dis = cont.get(this.props.content);
        if (!dis) {
            return <div>{tt('g.loading')}...</div>;
        }
        const comment = dis.toJS();
        if (!comment.stats) {
            console.error('Comment -- missing stats object');
            comment.stats = {};
        }
        const { allowDelete, authorRepLog10, gray } = comment.stats;
        const { author, json_metadata } = comment;
        const {
            username,
            depth,
            anchor_link,
            showNegativeComments,
            ignore_list,
            noImage,
        } = this.props;
        const { onShowReply, onShowEdit, onDeletePost } = this;
        const post = comment.author + '/' + comment.permlink;
        const {
            PostReplyEditor,
            PostEditEditor,
            showReply,
            showEdit,
            hide,
            hide_body,
        } = this.state;
        const Editor = showReply ? PostReplyEditor : PostEditEditor;

        let { rootComment } = this.props;
        if (!rootComment && depth === 1) {
            rootComment = comment.parent_author + '/' + comment.parent_permlink;
        }
        const comment_link = `/${comment.category}/@${rootComment}#@${
            comment.author
        }/${comment.permlink}`;
        const ignore = ignore_list && ignore_list.has(comment.author);

        if (!showNegativeComments && (hide || ignore)) {
            return null;
        }

        let jsonMetadata = null;
        try {
            if (!showReply) jsonMetadata = JSON.parse(json_metadata);
        } catch (error) {
            // console.error('Invalid json metadata string', json_metadata, 'in post', this.props.content);
        }
        // const get_asset_value = ( asset_str ) => { return parseFloat( asset_str.split(' ')[0] ); }
        // const steem_supply = this.props.global.getIn(['props','current_supply']);

        // hide images if author is in blacklist
        const hideImages = ImageUserBlockList.includes(author);

        const showDeleteOption = username === author && allowDelete;
        const showEditOption = username === author;
        const showReplyOption = comment.depth < 255;
        const archived = comment.cashout_time === '1969-12-31T23:59:59'; // TODO: audit after HF19. #1259
        const readonly = archived || $STM_Config.read_only_mode;

        let body = null;
        let controls = null;

        if (!this.state.collapsed && !hide_body) {
            body = (
                <MarkdownViewer
                    formId={post + '-viewer'}
                    text={comment.body}
                    noImage={noImage || gray}
                    hideImages={hideImages}
                    jsonMetadata={jsonMetadata}
                />
            );
            controls = (
                <div>
                    <Voting post={post} />
                    <span className="Comment__footer__controls">
                        {showReplyOption && (
                            <a onClick={onShowReply}>{tt('g.reply')}</a>
                        )}{' '}
                        {!readonly &&
                            showEditOption && (
                                <a onClick={onShowEdit}>{tt('g.edit')}</a>
                            )}{' '}
                        {!readonly &&
                            showDeleteOption && (
                                <a onClick={onDeletePost}>{tt('g.delete')}</a>
                            )}
                    </span>
                </div>
            );
        }

        let replies = null;
        if (!this.state.collapsed && comment.children > 0) {
            if (depth > 7) {
                const comment_permlink = `/${comment.category}/@${
                    comment.author
                }/${comment.permlink}`;
                replies = (
                    <Link to={comment_permlink}>
                        Show {comment.children} more{' '}
                        {comment.children == 1 ? 'reply' : 'replies'}
                    </Link>
                );
            } else {
                replies = comment.replies;
                sortComments(cont, replies, this.props.sort_order);
                // When a comment has hidden replies and is collapsed, the reply count is off
                //console.log("replies:", replies.length, "num_visible:", replies.filter( reply => !cont.get(reply).getIn(['stats', 'hide'])).length)
                replies = replies.map((reply, idx) => (
                    <Comment
                        key={idx}
                        content={reply}
                        cont={cont}
                        sort_order={this.props.sort_order}
                        depth={depth + 1}
                        rootComment={rootComment}
                        showNegativeComments={showNegativeComments}
                        onHide={this.props.onHide}
                    />
                ));
            }
        }

        const commentClasses = ['hentry'];
        commentClasses.push('Comment');
        commentClasses.push(this.props.root ? 'root' : 'reply');
        if (hide_body || this.state.collapsed) commentClasses.push('collapsed');

        let innerCommentClass = ignore || gray ? 'downvoted clearfix' : '';
        if (this.state.highlight) innerCommentClass += ' highlighted';

        //console.log(comment);
        let renderedEditor = null;
        if (showReply || showEdit) {
            renderedEditor = (
                <div key="editor">
                    <Editor
                        {...comment}
                        type={showReply ? 'submit_comment' : 'edit'}
                        successCallback={() => {
                            this.setState({
                                showReply: false,
                                showEdit: false,
                            });
                            this.saveOnShow(null);
                        }}
                        onCancel={() => {
                            this.setState({
                                showReply: false,
                                showEdit: false,
                            });
                            this.saveOnShow(null);
                        }}
                        jsonMetadata={jsonMetadata}
                    />
                </div>
            );
        }

        const depth_indicator = [];
        if (depth > 1) {
            for (let i = 1; i < depth; ++i) {
                depth_indicator.push(
                    <div key={i} className={`depth di-${i}`}>
                        &middot;
                    </div>
                );
            }
        }

        return (
            <div
                className={commentClasses.join(' ')}
                id={anchor_link}
                itemScope
                itemType="http://schema.org/comment"
            >
                {depth_indicator}
                <div className={innerCommentClass}>
                    <div className="Comment__Userpic show-for-medium">
                        <Userpic account={comment.author} />
                    </div>
                    <div className="Comment__header">
                        <div className="Comment__header_collapse">
                            <Voting post={post} flag />
                            <a
                                title={tt('g.collapse_or_expand')}
                                onClick={this.toggleCollapsed}
                            >
                                {this.state.collapsed ? '[+]' : '[-]'}
                            </a>
                        </div>
                        <span className="Comment__header-user">
                            <div className="Comment__Userpic-small">
                                <Userpic account={comment.author} />
                            </div>
                            <Author
                                author={comment.author}
                                authorRepLog10={authorRepLog10}
                            />
                        </span>
                        &nbsp; &middot; &nbsp;
                        <Link to={comment_link} className="PlainLink">
                            <TimeAgoWrapper
                                date={comment.created}
                                className="updated"
                            />
                        </Link>
                        {(this.state.collapsed || hide_body) && (
                            <Voting post={post} showList={false} />
                        )}
                        {this.state.collapsed &&
                            comment.children > 0 && (
                                <span className="marginLeft1rem">
                                    {tt('g.reply_count', {
                                        count: comment.children,
                                    })}
                                </span>
                            )}
                        {!this.state.collapsed &&
                            hide_body && (
                                <a
                                    className="marginLeft1rem"
                                    onClick={this.revealBody}
                                >
                                    {tt('g.reveal_comment')}
                                </a>
                            )}
                    </div>
                    <div className="Comment__body entry-content">
                        {showEdit ? renderedEditor : body}
                    </div>
                    <div className="Comment__footer">{controls}</div>
                </div>
                <div className="Comment__replies hfeed">
                    {showReply && renderedEditor}
                    {replies}
                </div>
            </div>
        );
    }
}

const Comment = connect(
    // mapStateToProps
    (state, ownProps) => {
        const { content } = ownProps;

        const username = state.user.getIn(['current', 'username']);
        const ignore_list = username
            ? state.global.getIn([
                  'follow',
                  'getFollowingAsync',
                  username,
                  'ignore_result',
              ])
            : null;

        return {
            ...ownProps,
            anchor_link: '#@' + content, // Using a hash here is not standard but intentional; see issue #124 for details
            username,
            ignore_list,
        };
    },

    // mapDispatchToProps
    dispatch => ({
        unlock: () => {
            dispatch(userActions.showLogin());
        },
        deletePost: (author, permlink) => {
            dispatch(
                transactionActions.broadcastOperation({
                    type: 'delete_comment',
                    operation: { author, permlink },
                    confirm: tt('g.are_you_sure'),
                })
            );
        },
    })
)(CommentImpl);
export default Comment;
