import ngModule from '../../module';
import Component from '../../lib/component';
import './style.scss';

export default class Field extends Component {
    constructor($element, $scope, $compile) {
        super($element, $scope);
        this.$compile = $compile;

        this.prefix = null;
        this.suffix = null;

        this.control = this.element.querySelector('.control');
        this.classList = this.element.classList;
        this.classList.add('vn-field');
        this.element.addEventListener('click', e => this.onClick(e));

        let container = this.element.querySelector('.container');
        container.addEventListener('mousedown', e => this.onMouseDown(e));
    }

    $onInit() {
        if (this.info) this.classList.add('has-icons');

        this.input.addEventListener('focus', () => this.onFocus(true));
        this.input.addEventListener('blur', () => this.onFocus(false));
        this.input.addEventListener('change', e => {
            this.emit('change', {event: e});
        });

        // XXX: Compatibility with old inputs
        let attrs = this.$element[0].attributes;
        if (!this.name && attrs.field) {
            let split = attrs.field.nodeValue.split('.');
            this.name = split[split.length - 1];
        }
    }

    set field(value) {
        this._field = value;
        this.classList.toggle('not-empty', value != null && value !== '');
        if (this.form) this.form.$setDirty();
        this.validateValue();
    }

    get field() {
        return this._field;
    }

    set value(value) {
        this.field = value;
    }

    get value() {
        return this.input.value;
    }

    set type(value) {
        this.input.type = value;
    }

    get type() {
        return this.input.type;
    }

    set name(value) {
        this.input.name = value;
    }

    get name() {
        return this.input.name;
    }

    set disabled(value) {
        this._disabled = boolTag(value);
        this.input.disabled = this._disabled;
        this.classList.toggle('disabled', this._disabled);
    }

    get disabled() {
        return this._disabled;
    }

    set readonly(value) {
        this._readonly = boolTag(value);
        this.input.readOnly = this._readonly;
        this.classList.toggle('readonly', this._readonly);
    }

    get readonly() {
        return this._readonly;
    }

    set required(value) {
        this._required = boolTag(value);
        let required = this.element.querySelector('.required');
        display(required, this._required);
    }

    get required() {
        return this._required;
    }

    set prefix(value) {
        this._prefix = value;
        this.refreshFix('.prefix', value);
    }

    get prefix() {
        return this._prefix;
    }

    set suffix(value) {
        this._suffix = value;
        this.refreshFix('.suffix', value);
    }

    get suffix() {
        return this._suffix;
    }

    set hint(value) {
        this._hint = value;
        this.refreshHint();
    }

    get hint() {
        return this._hint;
    }

    set error(value) {
        this._error = value;
        this.refreshHint();
        this.classList.toggle('invalid', Boolean(value));
    }

    get error() {
        return this._error;
    }

    refreshHint() {
        let hint = this.error || this.hint || '';
        let hintEl = this.element.querySelector('.hint');
        hintEl.innerText = hint;
        hintEl.classList.toggle('filled', Boolean(hint));
    }

    refreshFix(selector, text) {
        let fix = this.element.querySelector(selector);
        display(fix, text);
        fix.innerText = text || '';
    }

    onClick() {
        if (event.defaultPrevented) return;
        event.preventDefault();

        if (this.input !== document.activeElement)
            this.focus();
    }

    onMouseDown(event) {
        if (event.target == this.input) return;
        event.preventDefault();
        this.focus();
    }

    onFocus(hasFocus) {
        this.classList.toggle('focused', hasFocus);
    }

    onClear(event) {
        if (event.defaultPrevented) return;
        event.preventDefault();
        this.field = null;
        this.input.dispatchEvent(new Event('change'));
    }

    focus() {
        this.input.focus();
    }

    select() {
        this.input.select();
    }

    buildInput(type) {
        let template = `<input type="${type}" ng-model="$ctrl.field"></input>`;
        this.input = this.$compile(template)(this.$)[0];
        this.control.appendChild(this.input);
    }

    /**
     * If input value is invalid, sets the error message as hint.
     */
    validateValue() {
        this.error = this.input.checkValidity()
            ? null
            : this.input.validationMessage;
    }
}
Field.$inject = ['$element', '$scope', '$compile'];

ngModule.vnComponent('vnField', {
    template: require('./index.html'),
    transclude: {
        prepend: '?prepend',
        append: '?append'
    },
    controller: Field,
    bindings: {
        field: '=?',
        label: '@?',
        name: '@?',
        type: '@?',
        value: '=?',
        info: '@?',
        disabled: '<?',
        readonly: '<?',
        required: '<?',
        prefix: '@?',
        suffix: '@?',
        hint: '@?',
        error: '<?',
        onChange: '&?'
    },
    require: {
        form: '?^form'
    }
});

function boolTag(value) {
    return Boolean(value || value === '');
}

function display(element, display) {
    element.style.display = display ? 'initial' : 'none';
}