import { dispatch as d3_dispatch } from 'd3-dispatch';

import {
    event as d3_event,
    select as d3_select
} from 'd3-selection';

import { t } from '../util/locale';
import { svgIcon } from '../svg';
import { services } from '../services';

import { uiNoteComments } from './note_comments';
import { uiNoteHeader } from './note_header';

import {
    utilNoAuto,
    utilRebind
} from '../util';

import { utilDetect } from '../util/detect';
import { modeBrowse } from '../modes';


export function uiNoteEditor(context) {
    // TODO: use 'toggleNote' and 'saveNote' to add 'thank you' warning to the sidebar
    var dispatch = d3_dispatch('change', 'cancel', 'save', 'modifiedInput', 'updateNote', 'toggleNote', 'saveNote');
    var noteHeader = uiNoteHeader();
    var noteComments = uiNoteComments();
    var _inputValue;
    var _newComment;
    var _note;
    var _modified;


    function noteEditor(selection) {
        render(selection);
    }

    function cancel() {
        _newComment = false;
        context.selectedNoteID(null);
        context.enter(modeBrowse(context));
    }

    function save(updateFunction) {
        var osm = context.connection();
        if (!osm) {
            context.enter(modeBrowse(context));
            return;
        }

        // If user somehow got logged out mid-save, try to reauthenticate..
        // This can happen if they were logged in from before, but the tokens are no longer valid.
        if (!osm.authenticated()) {

            // TODO: dispatch 'notAuthenticated' to give warning

            osm.authenticate(function(err) {
                if (err) {    // quit save mode..
                    context.enter(modeBrowse(context));
                    return;
                } else {
                    save(updateFunction);  // continue where we left off..
                }
            });
            return;
        }

        function parseResults(results) { // TODO: simplify result parsing
            dispatch.call('change', results);

            // call success
            if (results) {
                success(results);
            }
            // otherwise, call failure
            else {
                failure(results);
            }
        }

        function success(results) {
            console.log('success!', results); // TODO: handle success
            dispatch.apply('updateNote');
        }

        function failure(results) { // TODO: handle failure & errors
            console.log('failure!', results);
        }

        updateFunction(parseResults);
    }


    function toggleNoteStatus(parseResults) {
        if (!_note || !_note.status || !context.selectedNoteID) return;
        services.osm.toggleNoteStatus(_note, _inputValue, parseResults);
    }


    function addNoteComment(parseResults) {
        if (!_note || !_note.status || !context.selectedNoteID) return;
        services.osm.addNoteComment(_note, _inputValue, parseResults);
    }


    function newComment(selection) {
        if (!context.selectedNoteID()) return;
        // New Comment
        var saveSection = selection.selectAll('.save-section')
            .data([0]);

        saveSection = saveSection.enter()
            .append('div')
            .attr('class','save-section cf')
            .merge(saveSection);

        saveSection
            .call(saveHeader)
            .call(input)
            .call(buttons);
    }


    function saveHeader(selection) {
        var header = selection.selectAll('.notesSaveHeader')
            .data([0]);

        header.enter()
            .append('h4')
            .attr('class', '.notesSaveHeader')
            .text(t('note.newComment'))
            .merge(header);
    }


    function input(selection) {
        var input = selection.selectAll('textarea')
            .data([0]);

        input.enter()
            .append('textarea')
            .attr('id', 'new-comment-input')
            .attr('placeholder', t('note.inputPlaceholder'))
            .attr('maxlength', 1000)
            .call(utilNoAuto)
            .on('input', change)
            .on('blur', change)
            .merge(input);


        function change() {
            _inputValue = this.value;
            console.log(_inputValue);
            dispatch.apply('modifiedInput');
        }
    }


    function buttons(selection) {
        // Buttons
        var buttonSection = selection.selectAll('.buttons')
            .data([0]);

        // enter
        var buttonEnter = buttonSection.enter()
            .append('div')
            .attr('class', 'buttons cf');

        buttonEnter
            .append('button')
            .attr('class', 'secondary-action button cancel-button')
            .append('span')
            .attr('class', 'label')
            .text(t('note.cancel'));

        buttonEnter
            .append('button')
            .attr('class', 'action button save-button')
            .append('span')
            .attr('class', 'label')
            .text(t('note.save'));

        var status;
        if (_note.status) {
            status = _note.status === 'open' ? t('note.close') : t('note.reopen');
        }

        buttonEnter
            .append('button')
            .attr('class', _note.status + '-button status-button action button')
            .append('span')
            .attr('class', 'label')
            .text(status);


        // update
        buttonSection = buttonSection
            .merge(buttonEnter);

        buttonSection.selectAll('.closed-button,.open-button')
            .on('click', function() {
                save(toggleNoteStatus);
                dispatch.apply('toggleNote', this); // TODO: dispatch toggleNote event
            });

        buttonSection.selectAll('.cancel-button')
            .on('click.cancel', cancel);

        buttonSection.selectAll('.save-button')
            .attr('disabled', function() {
                var n = d3_select('#new-comment-input').node();
                return (n && n.value.length) ? null : true;
            })
            .on('modifiedInput', function() {
                // TODO: determine how to toggle button on input via triggering 'modifiedInput' event
            })
            .on('click.save', function() {
                this.blur();    // avoid keeping focus on the button - #4641
                save(addNoteComment);
                dispatch.apply('saveNote', this, _newComment); // TODO: dispatch saveNote event
            });
    }


    function render(selection) {
        var header = selection.selectAll('.header')
            .data([0]);

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


        var body = selection.selectAll('.body')
            .data([0]);

        body = body.enter()
            .append('div')
            .attr('class', 'body')
            .merge(body);

        body.selectAll('.note-editor')
            .data([0])
            .enter()
            .append('div')
            .attr('class', 'modal-section note-editor')
            .call(noteHeader.note(_note))
            .call(noteComments.note(_note))
            .call(newComment);
    }


    noteEditor.note = function(_) {
        if (!arguments.length) return _note;
        _note = _;
        return noteEditor;
    };


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