import { describe, expect, it } from "vitest";

import { exportArchivedThreadMarkdown } from "../../src/app-server/services/thread-archive-markdown";
import type { ArchiveExportAdapter, ArchiveThreadInput } from "../../src/domain/threads/archive-markdown";
import type { ThreadTranscriptEntry } from "../../src/domain/threads/transcript";

describe("thread archive markdown export service", () => {
  it("expands templates, sanitizes paths, creates folders, and preserves existing files", async () => {
    const adapter = new MemoryAdapter(["Codex Archives/2026-05-18/My-Thread- abcdef12.md"]);

    const result = await exportArchivedThreadMarkdown(
      thread({ id: "abcdef12-9999", name: "My/Thread?" }),
      {
        archiveExportFolderTemplate: "Codex Archives/{{date}}",
        archiveExportFilenameTemplate: "{{title}} {{shortId}}",
        archiveExportTags: "codex, archive",
      },
      adapter,
      new Date(2026, 4, 18, 9, 8, 7),
    );

    expect(result.path).toBe("Codex Archives/2026-05-18/My-Thread- abcdef12 2.md");
    expect(adapter.folders).toContain("Codex Archives");
    expect(adapter.folders).toContain("Codex Archives/2026-05-18");
    expect(adapter.files.get(result.path)).toContain('thread_id: "abcdef12-9999"');
    expect(adapter.files.get(result.path)).toContain('tags: ["codex", "archive"]');
  });

  it("rejects vault-external or empty export paths", async () => {
    const adapter = new MemoryAdapter();
    await expect(
      exportArchivedThreadMarkdown(
        thread(),
        { archiveExportFolderTemplate: "../outside", archiveExportFilenameTemplate: "{{title}}.md" },
        adapter,
      ),
    ).rejects.toThrow("relative path segments");
    await expect(
      exportArchivedThreadMarkdown(thread(), { archiveExportFolderTemplate: "Exports", archiveExportFilenameTemplate: "   " }, adapter),
    ).rejects.toThrow("empty filename");
  });
});

function thread(overrides: Partial<ArchiveThreadInput> = {}): ArchiveThreadInput {
  return {
    id: "019e0182-cb70-7a72-ab48-8bc9d0b0d781",
    preview: "Preview",
    createdAt: 1,
    updatedAt: 1,
    name: "Thread",
    archived: false,
    transcriptEntries: [transcriptEntry("user", "Hello", 1)],
    ...overrides,
  };
}

function transcriptEntry(kind: ThreadTranscriptEntry["kind"], text: string, timestamp: number | null): ThreadTranscriptEntry {
  return { kind, text, timestamp };
}

class MemoryAdapter implements ArchiveExportAdapter {
  readonly files = new Map<string, string>();
  readonly folders = new Set<string>();

  constructor(existingFiles: string[] = []) {
    for (const file of existingFiles) {
      this.files.set(file, "");
      const parts = file.split("/");
      for (let index = 1; index < parts.length; index += 1) {
        this.folders.add(parts.slice(0, index).join("/"));
      }
    }
  }

  async exists(path: string): Promise<boolean> {
    return this.files.has(path) || this.folders.has(path);
  }

  async mkdir(path: string): Promise<void> {
    this.folders.add(path);
  }

  async write(path: string, data: string): Promise<void> {
    this.files.set(path, data);
  }
}