import 'reflect-metadata';

import { ElementRef } from '@angular/core';

import {
    InputDecimalPlacesDirective,
} from './input-decimal-places.directive';

const initInputDecimalPlacesDirective = (
    elementRef?: ElementRef,
) => {
    return new InputDecimalPlacesDirective(elementRef);
};

describe('keydown', () => {
    const keydownTest = (
        key: string,
        expectPreventDefault = false,
        startingValue = '',
        selectionStart = null,
        selectionEnd = null,
    ) => {
        const elementRef = {
            nativeElement: {
                selectionEnd,
                selectionStart,
                value: startingValue,
            },
        } as ElementRef;
        const inputDecimalPlacesDirective = initInputDecimalPlacesDirective(
            elementRef,
        );
        const event = {
            key,
        } as KeyboardEvent;
        event.preventDefault = jest.fn();

        inputDecimalPlacesDirective.keydown(event);

        if (expectPreventDefault) {
            expect(event.preventDefault).toHaveBeenCalled();
        } else {
            expect(event.preventDefault).not.toHaveBeenCalled();
        }
    };

    test('Does not prevent default if key is backspace', () => {
        keydownTest('Backspace');
    });

    test('Does not prevent default if key is Tab', () => {
        keydownTest('Tab');
    });

    test('Does not prevent default if key is End', () => {
        keydownTest('End');
    });

    test('Does not prevent default if key is Home', () => {
        keydownTest('Home');
    });

    test('Does not prevent default if key is ArrowRight', () => {
        keydownTest('ArrowRight');
    });

    test('Does not prevent default if key is ArrowLeft', () => {
        keydownTest('ArrowLeft');
    });

    test('Does not prevent default if key is ArrowUp', () => {
        keydownTest('ArrowUp');
    });

    test('Does not prevent default if key is ArrowDown', () => {
        keydownTest('ArrowDown');
    });

    test('Does not prevent default is just numbers', () => {
        keydownTest('1');
    });

    test('Does not prevent adding a decimal point', () => {
        keydownTest('.', false, '1');
    });

    // tslint:disable-next-line
    test('Does not prevent default if numbers added do not take the numbers over 2dp', () => {
        keydownTest('1', false, '1.1');
    });

    test('Prevents default if numbers added takes the numbers over 2dp', () => {
        keydownTest('1', true, '1.11');
    });

    test('Prevents default if key is minus', () => {
        keydownTest('-', true);
    });

    test('Lets the user enter values if a selection is made', () => {
        keydownTest('1', false, '12.13', 1, 2);
    });

    // tslint:disable-next-line
    test('Does not let the user enter values if the field is full but the selection has a length of 0', () => {
        keydownTest('1', true, '12.13', 1, 1);
    });
});