import React, {Component} from 'react';
import PropTypes from 'prop-types';

import Q from 'q';

import Dialog from '@material-ui/core/Dialog';
import DialogActions from '@material-ui/core/DialogActions';
import DialogContent from '@material-ui/core/DialogContent';
import DialogTitle from '@material-ui/core/DialogTitle';
import moment from 'moment';
import Button from '@material-ui/core/Button';
import Badge from '@material-ui/core/Badge';
import IconButton from '@material-ui/core/IconButton';
import Visibility from '@material-ui/icons/Visibility';
import PlayArrow from '@material-ui/icons/PlayArrow';
import Grid from '@material-ui/core/Grid';
import Tooltip from '@material-ui/core/Tooltip';
import Paper from '@material-ui/core/Paper';
import getUserIconSource from '../../gme/utils/getUserIconSource';

import DiffViewer from '../../Dialogs/DiffViewer';

const SAVE_PREFIX = 'save: ';

export default class ProjectHistory extends Component {
    static propTypes = {
        gmeClient: PropTypes.object.isRequired,
        onOK: PropTypes.func.isRequired,
        batchSize: PropTypes.number,
        userIdToDisplayName: PropTypes.object,
    };

    static defaultProps = {
        batchSize: 200,
        userIdToDisplayName: {},
    };

    state = {
        commits: [],
        activeCommit: this.props.gmeClient.getActiveCommitHash(),
        showDiff: false,
        diffWithRoot: null,
        detailed: false,
        noMore: false,
    };

    componentDidMount() {
        const {gmeClient, batchSize} = this.props;
        const {activeCommit} = this.state;

        gmeClient.getHistory(gmeClient.getProjectObject().projectId, activeCommit, batchSize, this.newHistoryItems);
    }

    showDiff = (oldRootHash) => {
        this.setState({
            showDiff: true,
            diffWithRoot: oldRootHash,
        });
    };

    closeDiff = () => {
        this.setState({
            showDiff: false,
            diffWithRoot: null,
        });
    };

    newHistoryItems = (err, items) => {
        // console.log(JSON.stringify(items, null, 2));
        if (!err) {
            this.setState({
                commits: this.state.commits.concat(items),
                noMore: items.length < this.props.batchSize,
            });
        }
    };

    revertToCommit = (revertCommit) => {
        const {gmeClient} = this.props;

        if (this.reverting) {
            return;
        }

        this.reverting = true;
        const project = gmeClient.getProjectObject();
        const {activeCommit} = this.state;

        let tags;

        // FIXME: This idea with tagging domains might not that good of an idea after all..
        project.setBranchHash('master', revertCommit._id, activeCommit)
            .then((result) => {
                if (result.status !== gmeClient.CONSTANTS.STORAGE.SYNCED) {
                    throw new Error('Could not synchronize reverting of commit');
                }

                // The branch moved backwards - now make sure we clean up all obsolete domain tags
                return project.getTags();
            })
            .then((tags_) => {
                tags = tags_;

                const tagHashes = Object.keys(tags)
                    .filter(tagName => tagName.startsWith('Domain_'))
                    .map(tagName => tags[tagName]);

                return Q.all(tagHashes.map(tagHash => project.getHistory(tagHash, 1)
                    .then(commits => commits[0])));
            })
            .then((tagCommits) => {
                const tagsToRemove = tagCommits
                    .filter(tagCommit => tagCommit.time > revertCommit.time)
                    .map((tagCommit) => {
                        const tagNames = Object.keys(tags);
                        let i;

                        for (i = 0; i < tagNames.length; i += 1) {
                            if (tags[tagNames[i]] === tagCommit._id) {
                                return tagNames[i];
                            }
                        }

                        return null;
                    });

                function removeTagsThrottle() {
                    const tagName = tagsToRemove.pop();
                    if (tagName) {
                        return project.deleteTag(tagName)
                            .then(removeTagsThrottle);
                    }

                    return null;
                }

                return removeTagsThrottle();
            })
            .then(() => {
                this.props.onOK();
            })
            .catch((err) => {
                console.error(err);
            });
    };

    render() {
        const {gmeClient, batchSize, userIdToDisplayName} = this.props;
        const {
            commits,
            showDiff,
            diffWithRoot,
            activeCommit,
            detailed,
            noMore,
        } = this.state;
        const items = [];

        commits.forEach((commit) => {
            const when = new Date(parseInt(commit.time, 10));
            const current = commit._id === activeCommit;
            const saveMsg = commit.message.startsWith(SAVE_PREFIX);
            const regularCommit = !(current || saveMsg);

            const updaterName = userIdToDisplayName[commit.updater[0]] || commit.updater[0];

            if (detailed || current || saveMsg) {
                items.push((
                    <Paper
                        key={commit._id}
                        style={{width: '100%', marginBottom: 4, backgroundColor: current ? 'aliceblue' : undefined}}
                        elevation={regularCommit ? 0 : 2}
                    >
                        <Grid
                            container
                            wrap="wrap"
                            spacing={0}
                            style={{
                                color: regularCommit ? 'grey' : 'black',
                                minWidth: '800px',
                                minHeight: '50px',
                            }}
                            alignItems="center"
                        >
                            <Grid item xs={2} style={{cursor: 'help'}}>
                                <Tooltip
                                    id="time-tooltip"
                                    title={moment(when)
                                        .local()
                                        .format('dddd, MMMM Do YYYY, h:mm:ss a')}
                                >
                                    <Badge badgeContent="">
                                        <img
                                            style={{
                                                width: 18,
                                                height: 18,
                                                marginLeft: 6,
                                                marginRight: 4,
                                                opacity: regularCommit ? 0.6 : 1,
                                            }}
                                            src={getUserIconSource(commit.updater[0])}
                                            alt="i"
                                        />
                                        {updaterName}
                                    </Badge>
                                </Tooltip>
                            </Grid>
                            <Grid
                                item
                                xs={2}
                                style={{fontSize: 14}}
                            >
                                {moment(when).fromNow()}
                            </Grid>
                            <Grid
                                item
                                xs={7}
                                style={{fontSize: regularCommit ? 12 : 14}}
                            >
                                {saveMsg ? commit.message.substr(SAVE_PREFIX.length) : commit.message}
                            </Grid>
                            <Grid item xs={1} zeroMinWidth>
                                <Tooltip id="revert-tooltip" title="Revert back to this">
                                    <IconButton
                                        style={{height: 22, width: 30, visibility: current ? 'hidden' : undefined}}
                                        onClick={() => {
                                            this.revertToCommit(commit);
                                        }}
                                    >
                                        <PlayArrow/>
                                    </IconButton>
                                </Tooltip>
                                <Tooltip id="read-only-view-tooltip" title="Check what is different in this version">
                                    <IconButton
                                        style={{height: 22, width: 30, visibility: current ? 'hidden' : undefined}}
                                        onClick={() => {
                                            this.showDiff(commit.root);
                                        }}
                                    >
                                        <Visibility/>
                                    </IconButton>
                                </Tooltip>
                            </Grid>
                        </Grid>
                    </Paper>));
            }
        });

        return (
            <Dialog maxWidth="md" open>
                <DialogTitle>
                    Project History
                </DialogTitle>
                <DialogContent>
                    <Grid container style={{paddingTop: '12px'}} spacing={16}>
                        {items}
                    </Grid>
                </DialogContent>
                <DialogActions>
                    <Button
                        onClick={() => {
                            this.setState({detailed: !detailed});
                        }}
                    >{detailed ? 'Hide details' : 'Show details'}
                    </Button>
                    <Button
                        disabled={noMore}
                        onClick={() => {
                            const lastCommit = commits.length === 0 ? gmeClient.getActiveCommitHash() :
                                commits[commits.length - 1].parents[0];

                            gmeClient.getHistory(
                                gmeClient.getProjectObject().projectId,
                                lastCommit,
                                batchSize,
                                this.newHistoryItems,
                            );
                        }}
                        color="secondary"
                    >getMore
                    </Button>
                    <Button onClick={this.props.onOK} color="primary">OK</Button>
                </DialogActions>
                {showDiff ? <DiffViewer gmeClient={gmeClient} oldRootHash={diffWithRoot} onOK={this.closeDiff}/> : null}
            </Dialog>
        );
    }
}