import { describe, it, expect } from "vitest";
import { readFileSync } from "fs";
import { resolve } from "path";

/**
 * Stylesheet regression test for Activity Log mobile layout.
 *
 * Parses `packages/dashboard/app/styles.css` and asserts that an
 * `@media (max-width: 768px)` block contains Activity Log mobile rules
 * for stacked/wrapped controls and entry layout. These selectors must
 * remain inside a mobile media query so the Activity Log renders
 * correctly on narrow screens.
 */

describe("activity-log-mobile-layout.css", () => {
  const cssPath = resolve(__dirname, "../styles.css");
  const cssContent = readFileSync(cssPath, "utf-8");

  /** Extract all content inside @media (max-width: 768px) blocks. */
  function extractMobileMediaBlocks(content: string): string {
    const blocks: string[] = [];
    const regex = /@media\s*\(\s*max-width:\s*768px\s*\)\s*\{/g;
    let match;

    while ((match = regex.exec(content)) !== null) {
      const startIdx = match.index + match[0].length;
      let braceCount = 1;
      let endIdx = startIdx;
      while (braceCount > 0 && endIdx < content.length) {
        if (content[endIdx] === "{") braceCount++;
        if (content[endIdx] === "}") braceCount--;
        endIdx++;
      }
      if (braceCount === 0) {
        blocks.push(content.slice(startIdx, endIdx - 1));
      }
    }
    return blocks.join("\n");
  }

  const mobileCss = extractMobileMediaBlocks(cssContent);

  // ── Modal sizing ────────────────────────────────────────────────────

  it("uses modal-lg base class for consistent wide sizing", () => {
    // The activity-log-modal should NOT set its own max-width; modal-lg handles width
    const modalBlock = cssContent.match(/\.activity-log-modal\s*\{[^}]*\}/)?.[0];
    expect(modalBlock).toBeTruthy();
    // Should NOT contain max-width (handled by modal-lg base class)
    expect(modalBlock).not.toMatch(/max-width:\s*\d+px/);
  });

  // ── Close button ────────────────────────────────────────────────────

  it("does not define a custom activity-log-close style (uses shared modal-close)", () => {
    // The modal should use the shared .modal-close class instead of a custom close button
    expect(cssContent).not.toMatch(/\.activity-log-close\s*\{/);
  });

  it("keeps close button on top row with title via order:-1", () => {
    // The .modal-close inside activity-log-header must appear before .activity-log-actions
    // in visual order to stay on the first row with the title
    expect(mobileCss).toMatch(/\.activity-log-header\s+\.modal-close\s*\{[^}]*order:\s*-1/);
  });

  it("pins close button to right edge via margin-left:auto", () => {
    // The .modal-close inside activity-log-header must be pushed to the right edge
    // of the first row using margin-left:auto
    expect(mobileCss).toMatch(/\.activity-log-header\s+\.modal-close\s*\{[^}]*margin-left:\s*auto/);
  });

  it("title participates in top row via flex:1 1 auto", () => {
    // The .activity-log-title should flex to fill available space in the top row
    expect(mobileCss).toMatch(/\.activity-log-title\s*\{[^}]*flex:\s*1\s+1\s+auto/);
  });

  // ── Modal header / actions ──────────────────────────────────────────

  it("has mobile rule for activity-log-header to wrap on narrow screens", () => {
    expect(mobileCss).toMatch(/\.activity-log-header\s*\{[^}]*flex-wrap:\s*wrap/);
  });

  it("has mobile rule for activity-log-actions to wrap and fill full width", () => {
    expect(mobileCss).toMatch(/\.activity-log-actions\s*\{[^}]*flex-wrap:\s*wrap/);
    expect(mobileCss).toMatch(/\.activity-log-actions\s*\{[^}]*flex:\s*1\s+1\s+100%/);
  });

  // ── Filter controls ─────────────────────────────────────────────────

  it("has mobile rule for filter containers to fill available width", () => {
    expect(mobileCss).toMatch(/\.activity-log-filter/);
    expect(mobileCss).toMatch(/\.activity-log-filter--project/);
  });

  it("has mobile rule for project filter to fill available width", () => {
    // Project filter selector must have mobile-specific width handling
    expect(mobileCss).toMatch(/\.activity-log-filter--project\s*\{[^}]*flex:\s*1\s+1\s+0/);
  });

  it("has mobile rule for filter selects to fill width", () => {
    expect(mobileCss).toMatch(/\.activity-log-filter-select\s*\{[^}]*width:\s*100%/);
  });

  // ── Active filters bar ──────────────────────────────────────────────

  it("has mobile rule for active-filters bar to wrap", () => {
    expect(mobileCss).toMatch(/\.activity-log-active-filters\s*\{[^}]*flex-wrap:\s*wrap/);
  });

  it("resets clear-filters margin-left on mobile so it doesn't force right", () => {
    expect(mobileCss).toMatch(/\.activity-log-clear-filters\s*\{[^}]*margin-left:\s*0/);
  });

  // ── Entry layout ────────────────────────────────────────────────────

  it("has mobile rule for entry details to wrap with word-break", () => {
    expect(mobileCss).toMatch(/\.activity-log-entry-details\s*\{[^}]*word-break:\s*break-word/);
  });

  it("has mobile rule for entry text to break words", () => {
    expect(mobileCss).toMatch(/\.activity-log-entry-text\s*\{[^}]*word-break:\s*break-word/);
  });

  it("has mobile rule for entry headers to wrap", () => {
    expect(mobileCss).toMatch(/\.activity-log-entry-header\s*\{[^}]*flex-wrap:\s*wrap/);
  });

  // ── Confirmation dialog ─────────────────────────────────────────────

  it("has mobile rule for confirm actions to stack vertically", () => {
    expect(mobileCss).toMatch(/\.activity-log-confirm-actions\s*\{[^}]*flex-direction:\s*column/);
  });

  it("has mobile rule for confirm buttons to fill width", () => {
    expect(mobileCss).toMatch(/\.activity-log-confirm-cancel[^}]*width:\s*100%/);
    expect(mobileCss).toMatch(/\.activity-log-confirm-clear[^}]*width:\s*100%/);
  });
});