import './validator.css';

import { Ut } from '../utils/Ut';
import { El } from '../utils/dom';
import { Boot } from '../core/Boot';
import { Validator } from './Validator';

////////////////////////////
// Class Form Validator
////////////////////////////

export class FormValidator extends Validator {

	constructor(target, opts) {

		super(target);
		
		this.target = target;

		if (this.target.dxData('form')) {
			return;
		}

		this.target.dxData('form', this);

		this.opts = { ... {
			submit     : false,
			display_err: true,
			reset_form : false
		}, ... opts };

		Ut.trigger(this.opts.onInit, this.target.elements, this);

		this.setEvents();
	}

	setEvents() {

		// Click on error UI

		this.target.dxOn('click.ui', '.sp-has-error', (_, t) => this.target.dxFind('input[name="' + t.dxFind('input').name + '"', item => item.parentNode?.classList.remove('sp-has-error')) );

		// Input Focus - Handler

		this.target.dxOn('click.form', 'input, select, textarea', (_, t) => {

			if (this.opts.display_err) {

				let fieldWrapper = t.dxParents('.form-field');

				fieldWrapper?.classList.remove('form-field-error');

				fieldWrapper?.dxFind('.sp-label-error')?.remove();
			}
			
			Ut.trigger(this.opts.onClick);
		});

		// Submit - Handler
		this.target.dxOn('submit.form', e => {

			if (!this.opts.submit) {
				e.preventDefault();
			}

			this.entry = this.getData();

			if (Ut.isFn(this.opts.valid) && !this.valid()) {
				e.preventDefault();
				return;
			}
		
			if (Ut.isFn(this.opts.onSubmit) && !this.opts.onSubmit(this.entry, this)) {
				e.preventDefault();
				return;
			}

			if (this.opts.submit) {
				return;
			}

			if (Ut.isFn(this.opts.onSubmit)) {
				this.opts.onSubmit.call(this);
			}

			if (this.opts.reset_form) {
				this.target.dxResetForm();
			}
		});

		// Fix keydown enter bug
		
		let delayed = false;

		this.target.dxOn('keydown.form', e => {

			if (e.key == 'Enter' && e.target.tagName.toLowerCase() != 'textarea') {

				e.preventDefault();
				
				if (!e.target.readOnly && !this.pendingRequest && !delayed) {

					delayed = true;

					setTimeout(() => delayed = false, 200);
					this.target.dxTrigger('submit');
				}
			}
		});
	}
	valid () {

		let pass = true;

		this.target.dxFind('.form-field-error', item => item.classList.remove('form-field-error', 'sp-has-error'));
		this.target.dxFind('.sp-label-error', item => item.remove());

		let rules = this.opts.valid(this.entry);

		for (let name in rules) {

			if (!(name in this.target.elements)) {
				continue;
			}

			let el = this.target.elements[ name ];

			if (!('length' in el ) || el.nodeName.toLowerCase() == 'select') {
				el = [ el ];
			}

			for (let input of el) {

				let val = (input.type && input.type == 'checkbox')
					? (input.checked ? input.value : '')
					: El('p', {}, input.value).textContent.trim();

				let ruleList = rules[ name ].split('|');

				for (let tokenRule of ruleList) {

					let chunks = tokenRule.split(':');

					let args = chunks[1] ?? null;

					let rule = chunks[0];

					if (!this.handlers[rule]) {
						throw new Error(`The rule "{${rule}}" does not exist`);
					}

					let format = { value: Validator.INPUT_STR };

					let result = this.handlers[ rule ] (val ?? null, !!input, args, format);

					if (result === false) {

						pass = false;

						let emsg = this.renderRuleMsg(format, rule, args);

						if (this.opts.display_err) {
							this.inputError(input, emsg);
						}

						Ut.trigger(this.opts.onError, emsg);

						break;
					}

					if (result === null) {
						break;
					}
				}	
			}
		}

		return pass;
	}

	renderRuleMsg(format, rule, args) {

		args = args ? args.split(',') : null;

		return Boot.intData.error[ this.formatName(format.value) + '_' + rule ].replace(/\$(\d+)/g, (_, i) => args[i - 1] ?? '')
	}

	formatName(val) {

		switch (val) {
			case Validator.INPUT_STR: return 'str';
			case Validator.INPUT_NUM: return 'num';
			case Validator.INPUT_FILE: return 'file';
			default: return 'str';
		}
	}

	inputError(input, emsg) {

		if (input.type == 'checkbox' || input.type == 'radio') {
			input.parentNode.classList.add('sp-has-error');
		}
		else {

			let fieldWrapper = input.dxParents('.form-field');

			if (!fieldWrapper) {
				return false;
			}

			fieldWrapper.classList.add('form-field-error');

			fieldWrapper.append( El('div', { className: 'sp-label-error' }, emsg ) );
		}

		return false;
	}

	destroy() {
		this.target.dxOff('submit.form click.form keydown.form click.ui');
		this.target.dxRemoveData('form');
	}
}