import { render } from "@testing-library/react";
import fc from "fast-check";
import Footer from "./Footer";

describe("Property 2: Social Links Open in New Tab", () => {
  it('should have target="_blank" and rel="noopener noreferrer" for all social links', () => {
    /**
     * **Validates: Requirements 2.7**
     *
     * Property: For any social media link in the Footer component, it should have
     * target="_blank" and rel="noopener noreferrer" attributes to open in a new tab
     * securely. This ensures consistent behavior across all social links and prevents
     * security vulnerabilities (tabnabbing).
     */
    fc.assert(
      fc.property(
        fc.constant(null), // No random input needed, testing static component
        () => {
          const { container } = render(<Footer />);

          // Find all social media links (they are within the "Connect" section)
          const socialLinks = container.querySelectorAll(
            'a[aria-label*="Visit"]',
          );

          // Verify we found social links
          if (socialLinks.length === 0) {
            return false;
          }

          // Check each social link
          let allLinksValid = true;

          socialLinks.forEach((link) => {
            const target = link.getAttribute("target");
            const rel = link.getAttribute("rel");

            // Both attributes must be present and correct
            if (target !== "_blank" || rel !== "noopener noreferrer") {
              allLinksValid = false;
            }
          });

          return allLinksValid;
        },
      ),
      { numRuns: 100 },
    );
  });

  it("should consistently apply security attributes across all social link variations", () => {
    /**
     * **Validates: Requirements 2.7**
     *
     * Property: For any subset of social links rendered, each link should maintain
     * the security attributes (target="_blank" and rel="noopener noreferrer").
     * This property verifies that the security pattern is consistently applied
     * regardless of which social platforms are included.
     */
    fc.assert(
      fc.property(
        fc.integer({ min: 0, max: 10 }), // Random seed for variation
        () => {
          const { container } = render(<Footer />);

          // Get all anchor tags in the footer
          const allLinks = container.querySelectorAll("footer a");

          // Filter to only social links (those with SVG icons and aria-labels about visiting profiles)
          const socialLinks = Array.from(allLinks).filter((link) => {
            const ariaLabel = link.getAttribute("aria-label");
            const hasSvg = link.querySelector("svg") !== null;
            return ariaLabel && ariaLabel.includes("Visit") && hasSvg;
          });

          // Verify we found social links
          if (socialLinks.length === 0) {
            return false;
          }

          // Check that ALL social links have the required attributes
          return socialLinks.every((link) => {
            const target = link.getAttribute("target");
            const rel = link.getAttribute("rel");
            return target === "_blank" && rel === "noopener noreferrer";
          });
        },
      ),
      { numRuns: 100 },
    );
  });

  it("should not apply new tab attributes to non-social links", () => {
    /**
     * **Validates: Requirements 2.7**
     *
     * Property: Only social media links should have target="_blank". Other links
     * in the footer (like email) should not force new tab behavior. This ensures
     * the new tab behavior is intentionally applied only where appropriate.
     */
    fc.assert(
      fc.property(fc.constant(null), () => {
        const { container } = render(<Footer />);

        // Get all anchor tags in the footer
        const allLinks = container.querySelectorAll("footer a");

        // Separate social links from other links
        const socialLinks: Element[] = [];
        const otherLinks: Element[] = [];

        allLinks.forEach((link) => {
          const ariaLabel = link.getAttribute("aria-label");
          const hasSvg = link.querySelector("svg") !== null;

          if (ariaLabel && ariaLabel.includes("Visit") && hasSvg) {
            socialLinks.push(link);
          } else {
            otherLinks.push(link);
          }
        });

        // All social links should have target="_blank"
        const allSocialLinksHaveTarget = socialLinks.every((link) => {
          return link.getAttribute("target") === "_blank";
        });

        // Non-social links (like email) should NOT have target="_blank"
        const noOtherLinksHaveTarget = otherLinks.every((link) => {
          return link.getAttribute("target") !== "_blank";
        });

        return allSocialLinksHaveTarget && noOtherLinksHaveTarget;
      }),
      { numRuns: 100 },
    );
  });

  it("should maintain security attributes after multiple renders", () => {
    /**
     * **Validates: Requirements 2.7**
     *
     * Property: For any number of component renders, social links should consistently
     * maintain their security attributes. This verifies that the attributes are not
     * accidentally removed or modified during re-renders.
     */
    fc.assert(
      fc.property(
        fc.integer({ min: 1, max: 5 }), // Test 1-5 renders
        (numRenders) => {
          let allRendersValid = true;

          for (let i = 0; i < numRenders; i++) {
            const { container, unmount } = render(<Footer />);

            // Find social links
            const socialLinks = container.querySelectorAll(
              'a[aria-label*="Visit"]',
            );

            // Check each link
            socialLinks.forEach((link) => {
              const target = link.getAttribute("target");
              const rel = link.getAttribute("rel");

              if (target !== "_blank" || rel !== "noopener noreferrer") {
                allRendersValid = false;
              }
            });

            unmount();
          }

          return allRendersValid;
        },
      ),
      { numRuns: 100 },
    );
  });

  it("should have both target and rel attributes present together", () => {
    /**
     * **Validates: Requirements 2.7**
     *
     * Property: For any social link, if target="_blank" is present, then
     * rel="noopener noreferrer" must also be present. These attributes work
     * together to provide secure new tab behavior, and one without the other
     * creates a security vulnerability.
     */
    fc.assert(
      fc.property(fc.constant(null), () => {
        const { container } = render(<Footer />);

        // Find all links with target="_blank"
        const linksWithTarget = container.querySelectorAll(
          'footer a[target="_blank"]',
        );

        // Verify we found links
        if (linksWithTarget.length === 0) {
          return false;
        }

        // Each link with target="_blank" must have rel="noopener noreferrer"
        return Array.from(linksWithTarget).every((link) => {
          const rel = link.getAttribute("rel");
          return rel === "noopener noreferrer";
        });
      }),
      { numRuns: 100 },
    );
  });

  it("should have exactly the expected number of social links with security attributes", () => {
    /**
     * **Validates: Requirements 2.7**
     *
     * Property: The Footer should render a specific number of social links (based on
     * the socialLinks array), and all of them should have the security attributes.
     * This ensures no links are accidentally missing the attributes.
     */
    fc.assert(
      fc.property(fc.constant(null), () => {
        const { container } = render(<Footer />);

        // Find all social links with security attributes
        const secureLinks = container.querySelectorAll(
          'footer a[target="_blank"][rel="noopener noreferrer"]',
        );

        // Find all social links (with aria-label containing "Visit")
        const allSocialLinks = container.querySelectorAll(
          'footer a[aria-label*="Visit"]',
        );

        // The number of secure links should equal the number of social links
        // This ensures ALL social links have the security attributes
        return (
          secureLinks.length === allSocialLinks.length &&
          allSocialLinks.length > 0
        );
      }),
      { numRuns: 100 },
    );
  });
});