'use strict';

const events = require('../events.js');
const api = require('../api.js');
const misc = require('../util/misc.js');
const views = require('../util/views.js');
const TagInputControl = require('../controls/tag_input_control.js');

const template = views.getTemplate('tag-edit');

class TagEditView extends events.EventTarget {
    constructor(ctx) {
        super();

        this._tag = ctx.tag;
        this._hostNode = ctx.hostNode;
        views.replaceContent(this._hostNode, template(ctx));

        views.decorateValidator(this._formNode);

        if (this._namesFieldNode) {
            this._namesFieldNode.addEventListener(
                'input', e => this._evtNameInput(e));
        }

        if (this._implicationsFieldNode) {
            new TagInputControl(
                this._implicationsFieldNode, this._tag.implications);
        }
        if (this._suggestionsFieldNode) {
            new TagInputControl(
                this._suggestionsFieldNode, this._tag.suggestions);
        }

        for (let node of this._formNode.querySelectorAll(
                'input, select, textarea')) {
            node.addEventListener(
                'change', e => {
                    this.dispatchEvent(new CustomEvent('change'));
                });
        }

        this._formNode.addEventListener('submit', e => this._evtSubmit(e));
    }

    clearMessages() {
        views.clearMessages(this._hostNode);
    }

    enableForm() {
        views.enableForm(this._formNode);
    }

    disableForm() {
        views.disableForm(this._formNode);
    }

    showSuccess(message) {
        views.showSuccess(this._hostNode, message);
    }

    showError(message) {
        views.showError(this._hostNode, message);
    }

    _evtNameInput(e) {
        const regex = new RegExp(api.getTagNameRegex());
        const list = misc.splitByWhitespace(this._namesFieldNode.value);

        if (!list.length) {
            this._namesFieldNode.setCustomValidity(
                'Tags must have at least one name.');
            return;
        }

        for (let item of list) {
            if (!regex.test(item)) {
                this._namesFieldNode.setCustomValidity(
                    `Tag name "${item}" contains invalid symbols.`);
                return;
            }
        }

        this._namesFieldNode.setCustomValidity('');
    }

    _evtSubmit(e) {
        e.preventDefault();
        this.dispatchEvent(new CustomEvent('submit', {
            detail: {
                tag: this._tag,

                names: this._namesFieldNode ?
                    misc.splitByWhitespace(this._namesFieldNode.value) :
                    undefined,

                category: this._categoryFieldNode ?
                    this._categoryFieldNode.value :
                    undefined,

                implications: this._implicationsFieldNode ?
                    misc.splitByWhitespace(this._implicationsFieldNode.value) :
                    undefined,

                suggestions: this._suggestionsFieldNode ?
                    misc.splitByWhitespace(this._suggestionsFieldNode.value) :
                    undefined,

                description: this._descriptionFieldNode ?
                    this._descriptionFieldNode.value :
                    undefined,
            },
        }));
    }

    get _formNode() {
        return this._hostNode.querySelector('form');
    }

    get _namesFieldNode() {
        return this._formNode.querySelector('.names input');
    }

    get _categoryFieldNode() {
        return this._formNode.querySelector('.category select');
    }

    get _implicationsFieldNode() {
        return this._formNode.querySelector('.implications input');
    }

    get _suggestionsFieldNode() {
        return this._formNode.querySelector('.suggestions input');
    }

    get _descriptionFieldNode() {
        return this._formNode.querySelector('.description textarea');
    }
}

module.exports = TagEditView;
