import * as d3 from 'd3';
import _ from 'lodash';
import { t } from '../util/locale';
import { d3combobox } from '../lib/d3.combobox.js';
import { osmChangeset } from '../osm';
import { modeSelect } from '../modes';
import { svgIcon } from '../svg';
import { tooltip } from '../util/tooltip';
import { uiRawTagEditor } from './raw_tag_editor';
import { utilDetect } from '../util/detect';
import {
    utilDisplayName,
    utilDisplayType,
    utilEntityOrMemberSelector,
    utilRebind,
    utilTriggerEvent
} from '../util';


var changeset;
var readOnlyTags = ['created_by', 'imagery_used', 'host', 'locale'];


export function uiCommit(context) {
    var dispatch = d3.dispatch('cancel', 'save');


    function commit(selection) {
        if (!changeset) {
            var detected = utilDetect(),
                tags = {
                    created_by: ('iD ' + context.version).substr(0, 255),
                    imagery_used: context.history().imageryUsed().join(';').substr(0, 255),
                    host: detected.host.substr(0, 255),
                    locale: detected.locale.substr(0, 255)
                };

            changeset = new osmChangeset({ tags: tags });
        }


        var changes = context.history().changes(),
            summary = context.history().difference().summary(),
            rawTagEditor = uiRawTagEditor(context).on('change', changeTags);

        selection
            .append('div')
            .attr('class', 'header fillL')
            .append('h3')
            .text(t('commit.title'));

        var body = selection
            .append('div')
            .attr('class', 'body');

        var commentSection = body
            .append('div')
            .attr('class', 'modal-section form-field commit-form');

        commentSection
            .append('label')
            .attr('class', 'form-label')
            .text(t('commit.message_label'));

        var commentField = commentSection
            .append('textarea')
            .attr('class', 'commit-form-comment')
            .attr('placeholder', t('commit.description_placeholder'))
            .attr('maxlength', 255)
            .property('value', context.storage('comment') || '')
            .on('input.save', change(true))
            .on('change.save', change())
            .on('blur.save', function() {
                context.storage('comment', this.value);
            });


        commentField.node().select();

        context.connection().userChangesets(function (err, changesets) {
            if (err) return;

            var comments = changesets.map(function(changeset) {
                return {
                    title: changeset.tags.comment,
                    value: changeset.tags.comment
                };
            });

            commentField
                .call(d3combobox()
                    .caseSensitive(true)
                    .data(_.uniqBy(comments, 'title'))
                );
        });

        var clippyArea = commentSection.append('div')
            .attr('class', 'clippy-area');

        var changeSetInfo = commentSection.append('div')
            .attr('class', 'changeset-info');

        changeSetInfo.append('a')
            .attr('target', '_blank')
            .attr('tabindex', -1)
            .call(svgIcon('#icon-out-link', 'inline'))
            .attr('href', t('commit.about_changeset_comments_link'))
            .append('span')
            .text(t('commit.about_changeset_comments'));


        // Warnings
        var warnings = body.selectAll('div.warning-section')
            .data([context.history().validate(changes)]);

        warnings = warnings.enter()
            .append('div')
            .attr('class', 'modal-section warning-section fillL2')
            .style('display', function(d) { return _.isEmpty(d) ? 'none' : null; })
            .style('background', '#ffb')
            .merge(warnings);

        warnings
            .append('h3')
            .text(t('commit.warnings'));

        warnings
            .append('ul')
            .attr('class', 'changeset-list');

        var warningLi = warnings.select('ul').selectAll('li')
            .data(function(d) { return d; });

        warningLi = warningLi.enter()
            .append('li')
            .on('mouseover', mouseover)
            .on('mouseout', mouseout)
            .on('click', warningClick)
            .merge(warningLi);

        warningLi
            .call(svgIcon('#icon-alert', 'pre-text'));

        warningLi
            .append('strong')
            .text(function(d) { return d.message; });

        warningLi.filter(function(d) { return d.tooltip; })
            .call(tooltip()
                .title(function(d) { return d.tooltip; })
                .placement('top')
            );


        // Upload Explanation
        var saveSection = body
            .append('div')
            .attr('class','modal-section save-section fillL cf');

        var prose = saveSection
            .append('p')
            .attr('class', 'commit-info')
            .html(t('commit.upload_explanation'));


        context.connection().userDetails(function(err, user) {
            if (err) return;

            var userLink = d3.select(document.createElement('div'));

            if (user.image_url) {
                userLink
                    .append('img')
                    .attr('src', user.image_url)
                    .attr('class', 'icon pre-text user-icon');
            }

            userLink
                .append('a')
                .attr('class','user-info')
                .text(user.display_name)
                .attr('href', context.connection().userURL(user.display_name))
                .attr('tabindex', -1)
                .attr('target', '_blank');

            prose
                .html(t('commit.upload_explanation_with_user', { user: userLink.html() }));
        });


        // Buttons
        var buttonSection = saveSection
            .append('div')
            .attr('class', 'buttons fillL cf');

        var cancelButton = buttonSection
            .append('button')
            .attr('class', 'secondary-action col5 button cancel-button')
            .on('click.cancel', function() {
                dispatch.call('cancel');
            });

        cancelButton
            .append('span')
            .attr('class', 'label')
            .text(t('commit.cancel'));

        var saveButton = buttonSection
            .append('button')
            .attr('class', 'action col5 button save-button')
            .attr('disabled', function() {
                var n = d3.select('.commit-form textarea').node();
                return (n && n.value.length) ? null : true;
            })
            .on('click.save', function() {
                dispatch.call('save', this, changeset);
                changeset = null;
            });

        saveButton
            .append('span')
            .attr('class', 'label')
            .text(t('commit.save'));


        // Raw Tag Editor
        var tagSection = body
            .append('div')
            .attr('class', 'modal-section tag-section raw-tag-editor');


        // Changes
        var changeSection = body
            .append('div')
            .attr('class', 'commit-section modal-section fillL2');

        changeSection.append('h3')
            .text(t('commit.changes', { count: summary.length }));

        var li = changeSection
            .append('ul')
            .attr('class', 'changeset-list')
            .selectAll('li')
            .data(summary);

        li = li.enter()
            .append('li')
            .on('mouseover', mouseover)
            .on('mouseout', mouseout)
            .on('click', zoomToEntity)
            .merge(li);

        li.each(function(d) {
            d3.select(this)
                .call(svgIcon('#icon-' + d.entity.geometry(d.graph), 'pre-text ' + d.changeType));
        });

        li.append('span')
            .attr('class', 'change-type')
            .text(function(d) { return t('commit.' + d.changeType) + ' '; });

        li.append('strong')
            .attr('class', 'entity-type')
            .text(function(d) {
                var matched = context.presets().match(d.entity, d.graph);
                return (matched && matched.name()) || utilDisplayType(d.entity.id);
            });

        li.append('span')
            .attr('class', 'entity-name')
            .text(function(d) {
                var name = utilDisplayName(d.entity) || '',
                    string = '';
                if (name !== '') string += ':';
                return string += ' ' + name;
            });

        li.style('opacity', 0)
            .transition()
            .style('opacity', 1);


        // Call change() off the bat, in case a changeset
        // comment is recovered from localStorage
        utilTriggerEvent(commentField, 'input');


        function mouseover(d) {
            if (d.entity) {
                context.surface().selectAll(
                    utilEntityOrMemberSelector([d.entity.id], context.graph())
                ).classed('hover', true);
            }
        }


        function mouseout() {
            context.surface().selectAll('.hover')
                .classed('hover', false);
        }


        function warningClick(d) {
            if (d.entity) {
                context.map().zoomTo(d.entity);
                context.enter(modeSelect(context, [d.entity.id]));
            }
        }


        function zoomToEntity(change) {
            var entity = change.entity;
            if (change.changeType !== 'deleted' &&
                context.graph().entity(entity.id).geometry(context.graph()) !== 'vertex') {
                context.map().zoomTo(entity);
                context.surface().selectAll(utilEntityOrMemberSelector([entity.id], context.graph()))
                    .classed('hover', true);
            }
        }


        function checkComment(comment) {
            // Save button disabled if there is no comment..
            d3.selectAll('.save-section .save-button')
                .attr('disabled', (comment.length ? null : true));

            // Warn if comment mentions Google..
            var googleWarning = clippyArea
               .html('')
               .selectAll('a')
               .data(comment.match(/google/i) ? [true] : []);

            googleWarning.exit()
                .remove();

            googleWarning.enter()
               .append('a')
               .attr('target', '_blank')
               .attr('tabindex', -1)
               .call(svgIcon('#icon-alert', 'inline'))
               .attr('href', t('commit.google_warning_link'))
               .append('span')
               .text(t('commit.google_warning'));
        }


        function change(onInput) {
            return function() {
                var comment = commentField.property('value').trim();
                if (!onInput) {
                    commentField.property('value', comment);
                }

                checkComment(comment);

                var changeset = updateChangeset({ comment: comment });
                var expanded = !tagSection.selectAll('a.hide-toggle.expanded').empty();

                tagSection
                    .call(rawTagEditor
                        .expanded(expanded)
                        .readOnlyTags(readOnlyTags)
                        .tags(_.clone(changeset.tags))
                    );
            };
        }


        function changeTags(changed) {
            if (changed.hasOwnProperty('comment')) {
                if (changed.comment === undefined) {
                    changed.comment = '';
                }
                changed.comment = changed.comment.trim();
                commentField.property('value', changed.comment);
            }
            updateChangeset(changed);
            utilTriggerEvent(commentField, 'input');
        }


        function updateChangeset(changed) {
            var tags = _.clone(changeset.tags);

            _.forEach(changed, function(v, k) {
                k = k.trim();
                if (readOnlyTags.indexOf(k) !== -1) return;

                if (k !== '' && v !== undefined) {
                    tags[k] = v.trim();
                } else {
                    delete tags[k];
                }
            });

            if (!_.isEqual(changeset.tags, tags)) {
                changeset = changeset.update({ tags: tags });
            }

            return changeset;
        }

    }

    return utilRebind(commit, dispatch, 'on');
}