// ImportEmptyState — unit tests (#356).
//
// FilterPanel.test.tsx pattern: no jsdom, `react-i18next` and `lucide-react`
// mocked, the component called as a function and its element tree walked.
// `t` returns the key, with the interpolation values appended, so the asserts
// read the i18n keys and never a hard-coded string. The inner `EmptyState` is
// expanded (called as a function too) so its buttons and links are visible.
import { describe, it, expect, vi } from "vitest";
import { isValidElement, type ReactElement, type ReactNode } from "react";
import { Link } from "react-router-dom";

vi.mock("react-i18next", async () => (await import("../../test/i18nMock")).i18nMock());

vi.mock("lucide-react", () => ({
  FolderOpen: () => null,
  Inbox: () => null,
}));

import { FolderOpen, Inbox } from "lucide-react";
import ImportEmptyState, {
  CSV_EXPORT_GUIDE_PATH,
  folderNameFromPath,
  type ImportEmptyStateProps,
} from "./ImportEmptyState";

type AnyElement = ReactElement<Record<string, unknown> & { children?: ReactNode }>;

function find(node: ReactNode, pred: (el: AnyElement) => boolean): AnyElement[] {
  if (Array.isArray(node)) return node.flatMap((n) => find(n, pred));
  if (!isValidElement(node)) return [];
  const el = node as AnyElement;
  return [...(pred(el) ? [el] : []), ...find(el.props.children, pred)];
}

function texts(node: ReactNode): string[] {
  if (Array.isArray(node)) return node.flatMap(texts);
  if (typeof node === "string") return [node];
  if (!isValidElement(node)) return [];
  return texts((node as AnyElement).props.children);
}

// Leaves of the walk: react-router's Link and the mocked icons keep their type.
const LEAVES = new Set<unknown>([Link, FolderOpen, Inbox]);

/** Resolves the inner `EmptyState` component so its buttons and links are visible. */
function expand(node: ReactNode): ReactNode {
  if (Array.isArray(node)) return node.map(expand);
  if (!isValidElement(node)) return node;
  const el = node as AnyElement;
  if (typeof el.type === "function" && !LEAVES.has(el.type)) {
    const render = el.type as (props: Record<string, unknown>) => ReactNode;
    return expand(render(el.props));
  }
  return { ...el, props: { ...el.props, children: expand(el.props.children) } } as ReactNode;
}

type ButtonEl = ReactElement<{ type: string; disabled: boolean; onClick: () => void; children?: ReactNode }>;
type LinkEl = ReactElement<{ to: string; children?: ReactNode }>;

function render(overrides: Partial<ImportEmptyStateProps> = {}) {
  const props: ImportEmptyStateProps = {
    hasFolder: false,
    folderName: null,
    onBrowse: vi.fn(),
    onCreateSample: vi.fn(),
    onRefresh: vi.fn(),
    isCreatingSample: false,
    ...overrides,
  };
  const tree = expand(ImportEmptyState(props));
  const buttons = find(tree, (e) => e.type === "button") as ButtonEl[];
  const links = find(tree, (e) => e.type === Link) as LinkEl[];
  return { props, tree, buttons, links };
}

describe("ImportEmptyState — no folder (#356)", () => {
  it("offers one primary 'choose a folder' button wired to onBrowse, and the guide link", () => {
    const { props, tree, buttons, links } = render({ hasFolder: false });

    expect(texts(tree)).toContain("t(import.empty.noFolder.title)");
    expect(texts(tree)).toContain("t(import.empty.noFolder.description)");

    expect(buttons).toHaveLength(1);
    expect(texts(buttons[0].props.children)).toContain("t(import.empty.noFolder.cta)");
    expect(buttons[0].props.disabled).toBe(false);
    buttons[0].props.onClick();
    expect(props.onBrowse).toHaveBeenCalledTimes(1);
    expect(props.onCreateSample).not.toHaveBeenCalled();

    expect(links).toHaveLength(1);
    expect(links[0].props.to).toBe(CSV_EXPORT_GUIDE_PATH);
    expect(links[0].props.to).toBe("/settings/users#import-export");
    expect(texts(links[0].props.children)).toContain("t(import.empty.guideLink)");
  });

  it("never shows the sample or refresh actions without a folder", () => {
    const { tree } = render({ hasFolder: false });
    expect(texts(tree)).not.toContain("t(import.empty.createSample)");
    expect(texts(tree)).not.toContain("t(import.empty.refresh)");
  });
});

describe("ImportEmptyState — folder without sources (#356)", () => {
  it("offers 'create a sample folder' as primary, 'refresh' as secondary, and the guide link", () => {
    const { props, tree, buttons, links } = render({ hasFolder: true, folderName: "Relevés" });

    expect(texts(tree)).toContain("t(import.empty.noSources.title)");

    expect(buttons).toHaveLength(2);
    expect(texts(buttons[0].props.children)).toContain("t(import.empty.createSample)");
    expect(buttons[0].props.disabled).toBe(false);
    buttons[0].props.onClick();
    expect(props.onCreateSample).toHaveBeenCalledTimes(1);

    expect(texts(buttons[1].props.children)).toContain("t(import.empty.refresh)");
    buttons[1].props.onClick();
    expect(props.onRefresh).toHaveBeenCalledTimes(1);
    expect(props.onBrowse).not.toHaveBeenCalled();

    expect(links).toHaveLength(1);
    expect(links[0].props.to).toBe("/settings/users#import-export");
    expect(texts(links[0].props.children)).toContain("t(import.empty.guideLink)");
  });

  it("disables the create button while the sample folders are being written", () => {
    const { buttons } = render({ hasFolder: true, folderName: "Relevés", isCreatingSample: true });
    expect(buttons[0].props.disabled).toBe(true);
    // Refresh stays available: it is not the action in flight.
    expect(buttons[1].props.disabled).toBe(false);
  });

  it("names the folder in the description, never the full path", () => {
    const folderName = folderNameFromPath("C:\\Users\\max\\Documents\\Relevés");
    const { tree } = render({ hasFolder: true, folderName });
    const description = texts(tree).find((s) => s.startsWith("t(import.empty.noSources.description"));

    expect(description).toBe("t(import.empty.noSources.description[folderName=Relevés])");
    expect(description).not.toContain("Users");
  });
});

describe("ImportEmptyState — getting-started target (#398)", () => {
  const highlighted = (tree: ReactNode) =>
    find(tree, (e) => e.props["data-onboarding-highlight"] === "true");

  it("highlights 'Choose a folder' without a folder, and only it", () => {
    const { tree } = render({ hasFolder: false, onboardingTarget: true });
    const targets = highlighted(tree);
    expect(targets).toHaveLength(1);
    expect(targets[0].type).toBe("button");
    expect(texts(targets[0].props.children)).toContain("t(import.empty.noFolder.cta)");
  });

  it("highlights 'Create a sample folder' in a folder without sources, not 'Refresh'", () => {
    const { tree } = render({ hasFolder: true, folderName: "Relevés", onboardingTarget: true });
    const targets = highlighted(tree);
    expect(targets).toHaveLength(1);
    expect(texts(targets[0].props.children)).toContain("t(import.empty.createSample)");
  });

  it("highlights nothing without the property", () => {
    expect(highlighted(render({ hasFolder: false }).tree)).toHaveLength(0);
    expect(highlighted(render({ hasFolder: true, folderName: "Relevés" }).tree)).toHaveLength(0);
    expect(highlighted(render({ hasFolder: true, onboardingTarget: false }).tree)).toHaveLength(0);
  });
});

describe("folderNameFromPath (#356)", () => {
  it("returns the last segment for POSIX and Windows paths", () => {
    expect(folderNameFromPath("/home/max/releves")).toBe("releves");
    expect(folderNameFromPath("C:\\Users\\max\\Relevés")).toBe("Relevés");
  });

  it("ignores trailing separators", () => {
    expect(folderNameFromPath("/home/max/releves/")).toBe("releves");
    expect(folderNameFromPath("C:\\Users\\max\\Relevés\\")).toBe("Relevés");
  });

  it("falls back to the path itself when it has no segment", () => {
    expect(folderNameFromPath("/")).toBe("/");
    expect(folderNameFromPath("")).toBe("");
  });
});