import type { ReactNode } from "react";
import ReactMarkdown from "react-markdown";
import { renderToStaticMarkup } from "react-dom/server";
import { cleanup, fireEvent, render, screen } from "@testing-library/react";
import { afterEach, describe, expect, it, vi } from "vitest";

const openFile = vi.hoisted(() => vi.fn());
const appState = vi.hoisted(() => ({
  value: {
    tasks: { activeSessionId: "session-1" },
    taskSessions: {
      items: {
        "session-1": {
          worktree_path: "/root/.kandev/tasks/example/kandev",
        },
      } as Record<string, { worktree_path: string; workspace_path?: string }>,
    },
  },
}));

vi.mock("@/components/shared/mermaid-block", () => ({
  MermaidBlock: ({ code, taskId }: { code: string; taskId?: string | null }) => (
    <div data-kind="mermaid" data-task-id={taskId ?? undefined}>
      {code}
    </div>
  ),
}));

vi.mock("@/components/task/chat/messages/code-block", () => ({
  CodeBlock: ({ children, className }: { children: ReactNode; className?: string }) => (
    <pre data-kind="block" className={className}>
      <code>{children}</code>
    </pre>
  ),
}));

vi.mock("@/components/task/chat/messages/inline-code", () => ({
  InlineCode: ({ children }: { children: ReactNode }) => <code data-kind="inline">{children}</code>,
}));

vi.mock("@/hooks/use-panel-actions", () => ({
  usePanelActions: () => ({ openFile }),
}));

vi.mock("@/components/state-provider", () => ({
  useAppStore: (selector: (state: typeof appState.value) => unknown) => selector(appState.value),
}));

import {
  MarkdownFileLinkContext,
  MarkdownTaskContext,
  markdownComponents,
  normalizeMarkdown,
  remarkPlugins,
  type MarkdownFileLinkContextValue,
} from "./markdown-components";

function renderMarkdown(source: string): string {
  return renderToStaticMarkup(
    <ReactMarkdown remarkPlugins={remarkPlugins} components={markdownComponents}>
      {source}
    </ReactMarkdown>,
  );
}

function renderTaskMarkdown(source: string, taskId: string): string {
  return renderToStaticMarkup(
    <MarkdownTaskContext.Provider value={taskId}>
      <ReactMarkdown remarkPlugins={remarkPlugins} components={markdownComponents}>
        {source}
      </ReactMarkdown>
    </MarkdownTaskContext.Provider>,
  );
}

function Markdown({ children }: { children: string }) {
  return (
    <ReactMarkdown remarkPlugins={remarkPlugins} components={markdownComponents}>
      {children}
    </ReactMarkdown>
  );
}

function resetMarkdownComponentTestState() {
  cleanup();
  openFile.mockClear();
  appState.value.tasks.activeSessionId = "session-1";
  appState.value.taskSessions.items = {
    "session-1": {
      worktree_path: "/root/.kandev/tasks/example/kandev",
    },
  };
}

describe("markdownComponents", () => {
  afterEach(resetMarkdownComponentTestState);

  it("keeps mermaid keywords in inline code as inline code", () => {
    const html = renderMarkdown("Metadata comes from `kanban`, `kanbanMulti`, repositories.");

    expect(html).toContain('data-kind="inline"');
    expect(html).toContain("kanban");
    expect(html).not.toContain('data-kind="mermaid"');
  });

  it("renders fenced mermaid code as a mermaid block", () => {
    const html = renderMarkdown("```mermaid\ngraph LR\nA-->B\n```");

    expect(html).toContain('data-kind="mermaid"');
    expect(html).toContain("graph LR");
  });

  it("passes the owning task to a fenced Mermaid block", () => {
    const html = renderTaskMarkdown("```mermaid\ngraph LR\nA-->B\n```", "task-a");

    expect(html).toContain('data-task-id="task-a"');
  });

  it("renders non-mermaid fenced code as a code block", () => {
    const html = renderMarkdown("```ts\nconst source = 'kanban';\n```");

    expect(html).toContain('data-kind="block"');
    expect(html).toContain("language-ts");
    expect(html).toContain("const source");
    expect(html).not.toContain('data-kind="mermaid"');
  });

  it("opens absolute worktree file links in the editor", () => {
    render(
      <Markdown>
        {"[spec.md](/root/.kandev/tasks/example/kandev/docs/specs/native/spec.md)"}
      </Markdown>,
    );

    fireEvent.click(screen.getByRole("link", { name: "spec.md" }));

    expect(openFile).toHaveBeenCalledWith("docs/specs/native/spec.md");
  });

  it("opens absolute worktree file links with line suffixes in the editor", () => {
    render(
      <Markdown>
        {
          "[workflow](/root/.kandev/tasks/example/kandev/.github/workflows/opencode-code-review.yml:1)"
        }
      </Markdown>,
    );

    fireEvent.click(screen.getByRole("link", { name: "workflow" }));

    expect(openFile).toHaveBeenCalledWith(".github/workflows/opencode-code-review.yml");
  });

  it("opens relative file links in the editor", () => {
    render(<Markdown>{"[plan.md](docs/specs/native/plan.md)"}</Markdown>);

    const link = screen.getByRole("link", { name: "plan.md" });
    expect(link.getAttribute("target")).toBe("_self");

    fireEvent.click(link);

    expect(openFile).toHaveBeenCalledWith("docs/specs/native/plan.md");
  });

  it("opens repo-root file links in the editor", () => {
    render(<Markdown>{"[migration](/docs/nextjs-spa-migration.md)"}</Markdown>);

    const link = screen.getByRole("link", { name: "migration" });
    fireEvent.click(link);

    expect(openFile).toHaveBeenCalledWith("docs/nextjs-spa-migration.md");
  });

  it("opens repo-root file links with line and column suffixes in the editor", () => {
    render(<Markdown>{"[migration](/docs/nextjs-spa-migration.md:12:3)"}</Markdown>);

    fireEvent.click(screen.getByRole("link", { name: "migration" }));

    expect(openFile).toHaveBeenCalledWith("docs/nextjs-spa-migration.md");
  });

  it("opens repo-root file links when no worktree path is available", () => {
    appState.value.taskSessions.items = {};

    render(<Markdown>{"[migration](/docs/nextjs-spa-migration.md)"}</Markdown>);

    fireEvent.click(screen.getByRole("link", { name: "migration" }));

    expect(openFile).toHaveBeenCalledWith("docs/nextjs-spa-migration.md");
  });

  it("does not open host-absolute file links outside the worktree", () => {
    render(<Markdown>{"[secret](/root/other-project/secret.md)"}</Markdown>);

    fireEvent.click(screen.getByRole("link", { name: "secret" }));

    expect(openFile).not.toHaveBeenCalled();
  });

  it("does not treat sibling workspace paths as repo-root file links", () => {
    appState.value.taskSessions.items["session-1"].worktree_path = "/workspace/current-project";

    render(<Markdown>{"[schema](/workspace/sibling-project/schema.prisma)"}</Markdown>);

    fireEvent.click(screen.getByRole("link", { name: "schema" }));

    expect(openFile).not.toHaveBeenCalled();
  });

  it("does not open Windows drive-letter absolute file links", () => {
    render(<Markdown>{"[hosts](/C:/Windows/System32/drivers/etc/hosts)"}</Markdown>);

    const link = screen.getByRole("link", { name: "hosts" });
    fireEvent.click(link);

    expect(openFile).not.toHaveBeenCalled();
    expect(link.getAttribute("aria-disabled")).toBe("true");
  });

  it("does not treat bare domains as relative file links", () => {
    render(<Markdown>{"[service](api.service.com)"}</Markdown>);

    const link = screen.getByRole("link", { name: "service" });
    link.addEventListener("click", (event) => event.preventDefault());
    fireEvent.click(link);

    expect(openFile).not.toHaveBeenCalled();
    expect(link.getAttribute("target")).toBe("_blank");
  });
});

describe("markdownComponents registered source links", () => {
  afterEach(resetMarkdownComponentTestState);

  it("opens registered repository paths through the active task worktree", () => {
    const fileLinkContext: MarkdownFileLinkContextValue = {
      worktreePath: "/root/.kandev/tasks/example",
      onOpenFile: openFile,
      fileRootAliases: [
        {
          repositoryId: "repo-1",
          sourceRoot: "/home/jcfs/kandev-plugins/project",
          workspaceRelativeRoot: "kandev",
        },
      ],
    };

    render(
      <MarkdownFileLinkContext.Provider value={fileLinkContext}>
        <Markdown>{"[bundle](/home/jcfs/kandev-plugins/project/ui/bundle.js:61)"}</Markdown>
      </MarkdownFileLinkContext.Provider>,
    );

    fireEvent.click(screen.getByRole("link", { name: "bundle" }));

    expect(openFile).toHaveBeenCalledWith("kandev/ui/bundle.js");
  });

  it("keeps an unmatched host path inert", () => {
    render(<Markdown>{"[secret](/home/other-project/secret.md)"}</Markdown>);

    const link = screen.getByRole("link", { name: "secret" });
    expect(fireEvent.click(link)).toBe(false);
    expect(openFile).not.toHaveBeenCalled();
    expect(link.getAttribute("aria-disabled")).toBe("true");
  });
});

describe("markdownComponents workspace roots", () => {
  afterEach(resetMarkdownComponentTestState);

  it("opens multi-repository absolute links relative to the task workspace root", () => {
    appState.value.taskSessions.items["session-1"].workspace_path = "/root/.kandev/tasks/example";
    render(
      <Markdown>
        {
          "[primary](/root/.kandev/tasks/example/kandev/docs/specs/native/spec.md) [sibling](/root/.kandev/tasks/example/plugin/ui/bundle.js)"
        }
      </Markdown>,
    );

    fireEvent.click(screen.getByRole("link", { name: "primary" }));
    fireEvent.click(screen.getByRole("link", { name: "sibling" }));

    expect(openFile).toHaveBeenNthCalledWith(1, "kandev/docs/specs/native/spec.md");
    expect(openFile).toHaveBeenNthCalledWith(2, "plugin/ui/bundle.js");
  });
});

describe("markdownComponents omp read selectors", () => {
  afterEach(() => {
    cleanup();
    openFile.mockClear();
    appState.value.tasks.activeSessionId = "session-1";
    appState.value.taskSessions.items = {
      "session-1": { worktree_path: "/root/.kandev/tasks/example/kandev" },
    };
  });

  it("opens file links with omp range selectors in the editor", () => {
    render(<Markdown>{"[readme](docs/README.md:16-20)"}</Markdown>);
    fireEvent.click(screen.getByRole("link", { name: "readme" }));
    expect(openFile).toHaveBeenCalledWith("docs/README.md");
  });

  it("opens file links with omp multi-range and mode selectors in the editor", () => {
    render(<Markdown>{"[readme](docs/README.md:5-16,960-973:raw)"}</Markdown>);
    fireEvent.click(screen.getByRole("link", { name: "readme" }));
    expect(openFile).toHaveBeenCalledWith("docs/README.md");
  });
});

describe("normalizeMarkdown", () => {
  it("splits a glued 4-backtick close", () => {
    const input = "````go\nfunc f() {\n  ...\n}````\nprose continues here";
    const expected = "````go\nfunc f() {\n  ...\n}\n````\nprose continues here";
    expect(normalizeMarkdown(input)).toBe(expected);
  });

  it("splits a glued 3-backtick close", () => {
    const input = "```go\nfunc f() {}```\nprose";
    const expected = "```go\nfunc f() {}\n```\nprose";
    expect(normalizeMarkdown(input)).toBe(expected);
  });

  it("leaves a valid fence (close on its own line) unchanged", () => {
    const input = "```go\nfunc f() {}\n```\nprose";
    expect(normalizeMarkdown(input)).toBe(input);
  });

  it("leaves inline-code prose outside any fence unchanged", () => {
    const input = "Use `code` inline in a paragraph.";
    expect(normalizeMarkdown(input)).toBe(input);
  });

  it("does not split when trailing run is shorter than opener", () => {
    // Opens with 4, line ends with 3 — those 3 backticks would not close, so
    // we must not split. The parser will keep gobbling, but at least we don't
    // invent a false close.
    const input = "````go\nfunc f() {}```\nstill code";
    expect(normalizeMarkdown(input)).toBe(input);
  });

  it("splits only the malformed fence when multiple fences appear", () => {
    const input = ["```go", "func f() {}```", "prose", "", "```ts", "const x = 1;", "```"].join(
      "\n",
    );
    const expected = [
      "```go",
      "func f() {}",
      "```",
      "prose",
      "",
      "```ts",
      "const x = 1;",
      "```",
    ].join("\n");
    expect(normalizeMarkdown(input)).toBe(expected);
  });

  it("handles up to 3 leading spaces on the opener", () => {
    const input = "   ```go\nfunc f() {}```\nprose";
    const expected = "   ```go\nfunc f() {}\n```\nprose";
    expect(normalizeMarkdown(input)).toBe(expected);
  });

  it("returns pure prose unchanged", () => {
    const input = "Just some paragraph text with no fences.\nSecond line.";
    expect(normalizeMarkdown(input)).toBe(input);
  });

  it("returns empty and single-line input unchanged", () => {
    expect(normalizeMarkdown("")).toBe("");
    expect(normalizeMarkdown("single line")).toBe("single line");
  });

  it("preserves a trailing newline if present", () => {
    const input = "```go\nx```\nprose\n";
    const expected = "```go\nx\n```\nprose\n";
    expect(normalizeMarkdown(input)).toBe(expected);
  });

  it("renders malformed fence + prose as two code blocks plus a paragraph", () => {
    const malformed = "```go\nfunc f() {}```\nprose continues here\n```ts\nconst x = 1;\n```";
    const htmlRaw = renderMarkdown(malformed);
    const htmlFixed = renderMarkdown(normalizeMarkdown(malformed));

    // Without normalization the parser swallows the prose into one code node.
    const rawBlockCount = (htmlRaw.match(/data-kind="block"/g) ?? []).length;
    const fixedBlockCount = (htmlFixed.match(/data-kind="block"/g) ?? []).length;
    expect(fixedBlockCount).toBeGreaterThan(rawBlockCount);
    expect(fixedBlockCount).toBe(2);

    // Prose paragraph is visible as its own node, not inside a code block.
    expect(htmlFixed).toContain("prose continues here");
    expect(htmlFixed).toContain("language-go");
    expect(htmlFixed).toContain("language-ts");
  });
});