import { Result } from 'axe-core';
import { Options } from 'cypress-axe';

// Log violations to terminal/commandline in a table format.
// Uses 'log' and 'table' tasks defined in ../plugins/index.ts
// Borrowed from https://github.com/component-driven/cypress-axe#in-your-spec-file
function terminalLog(violations: Result[]) {
    cy.task(
        'log',
        `${violations.length} accessibility violation${violations.length === 1 ? '' : 's'} ${violations.length === 1 ? 'was' : 'were'} detected`
    );
    // pluck specific keys to keep the table readable
    const violationData = violations.map(
        ({ id, impact, description, helpUrl, nodes }) => ({
            id,
            impact,
            description,
            helpUrl,
            nodes: nodes.length,
            html: nodes.map(node => node.html)
        })
    );

    // Print violations as an array, since 'node.html' above often breaks table alignment
    cy.task('log', violationData);
    // Optionally, uncomment to print as a table
    // cy.task('table', violationData);

}

// Custom "testA11y()" method which checks accessibility using cypress-axe
// while also ensuring any violations are logged to the terminal (see terminalLog above)
// This method MUST be called after cy.visit(), as cy.injectAxe() must be called after page load
export const testA11y = (context?: any, options?: Options) => {
    cy.injectAxe();
    cy.configureAxe({
        rules: [
            // Disable color contrast checks as they are inaccurate / result in a lot of false positives
            // See also open issues in axe-core: https://github.com/dequelabs/axe-core/labels/color%20contrast
            { id: 'color-contrast', enabled: false },
        ]
    });
    cy.checkA11y(context, options, terminalLog);
};