'use strict';
const React = require('react');
const moment = require('moment');

const DIFF_PREFIXES = {
    A: ' ',
    E: ' ',
    D: '-',
    N: '+',
};

const SPADEN_CLASS = {
    A: 'blue', // array edited
    E: 'blue', // edited
    D: 'negative', // deleted
    N: 'positive', // added
};

const LogEntry = React.createClass({
    propTypes: {
        event: React.PropTypes.object.isRequired,
    },

    render () {
        const date = moment(this.props.event.createdAt);

        return (
            <tr>
            <td>
              {date.format('ll')}<br />
              {date.format('HH:mm')}
            </td>
            <td>
            <strong>{this.props.event.data.name}</strong><em>[{this.props.event.type}]</em>
            </td>
            <td style={{ maxWidth: 300 }}>
              {this.renderEventDiff()}
            </td>
            <td>{this.props.event.createdBy}</td>
            </tr>
        );
    },

    renderFullEventData () {
        const localEventData = JSON.parse(JSON.stringify(this.props.event.data));
        delete localEventData.description;
        delete localEventData.name;

        const prettyPrinted = JSON.stringify(localEventData, null, 2);

        return (<code className="JSON smalltext man">{prettyPrinted}</code>);
    },

    renderEventDiff () {
        if (!this.props.showFullEvents && this.props.event.diffs) {
            const changes = this.props.event.diffs.map(this.buildDiff);
            return (
                <code className="smalltext man">{changes.length === 0 ? '(no changes)' : changes}</code>
            );
        }
        return this.renderFullEventData();
    },

    buildDiff (diff, idx) {
        let change;
        const key = diff.path.join('.');

        if (diff.lhs !== undefined && diff.rhs !== undefined) {
            change = (
                <div>
                  <div className={SPADEN_CLASS.D}>- {key}: {JSON.stringify(diff.lhs)}</div>
                  <div className={SPADEN_CLASS.N}>+ {key}: {JSON.stringify(diff.rhs)}</div>
                </div>
            );
        } else {
            const spadenClass = SPADEN_CLASS[diff.kind];
            const prefix      = DIFF_PREFIXES[diff.kind];

            change = (<div className={spadenClass}>{prefix} {key}: {JSON.stringify(diff.rhs)}</div>);
        }

        return (<div key={idx}>{change}</div>);
    },

});

module.exports = LogEntry;