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

/** Coerces a data-bound value (typically a string) to a boolean. */
function coerceBooleanProperty(value) {
    return value != null && `${value}` !== 'false';
}

function coerceNumberProperty(value, fallbackValue = 0) {
    return _isNumberValue(value) ? Number(value) : fallbackValue;
}
/**
 * Whether the provided value is considered a number.
 * @docs-private
 */
function _isNumberValue(value) {
    // parseFloat(value) handles most of the cases we're interested in (it treats null, empty string,
    // and other non-number values as NaN, where Number just uses 0) but it considers the string
    // '123hello' to be a valid number. Therefore we also check if Number(value) is NaN.
    return !isNaN(parseFloat(value)) && !isNaN(Number(value));
}

function coerceArray(value) {
    return Array.isArray(value) ? value : [value];
}

/** Coerces a value to a CSS pixel value. */
function coerceCssPixelValue(value) {
    if (value == null) {
        return '';
    }
    return typeof value === 'string' ? value : `${value}px`;
}

/**
 * Coerces an ElementRef or an Element into an element.
 * Useful for APIs that can accept either a ref or the native element itself.
 */
function coerceElement(elementOrRef) {
    return elementOrRef instanceof ElementRef ? elementOrRef.nativeElement : elementOrRef;
}

/**
 * Coerces a value to an array of trimmed non-empty strings.
 * Any input that is not an array, `null` or `undefined` will be turned into a string
 * via `toString()` and subsequently split with the given separator.
 * `null` and `undefined` will result in an empty array.
 * This results in the following outcomes:
 * - `null` -> `[]`
 * - `[null]` -> `["null"]`
 * - `["a", "b ", " "]` -> `["a", "b"]`
 * - `[1, [2, 3]]` -> `["1", "2,3"]`
 * - `[{ a: 0 }]` -> `["[object Object]"]`
 * - `{ a: 0 }` -> `["[object", "Object]"]`
 *
 * Useful for defining CSS classes or table columns.
 * @param value the value to coerce into an array of strings
 * @param separator split-separator if value isn't an array
 */
function coerceStringArray(value, separator = /\s+/) {
    const result = [];
    if (value != null) {
        const sourceValues = Array.isArray(value) ? value : `${value}`.split(separator);
        for (const sourceValue of sourceValues) {
            const trimmedString = `${sourceValue}`.trim();
            if (trimmedString) {
                result.push(trimmedString);
            }
        }
    }
    return result;
}

export { _isNumberValue, coerceArray, coerceBooleanProperty, coerceCssPixelValue, coerceElement, coerceNumberProperty, coerceStringArray };
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