/** Unit tests for the TS LanceDB client. */

import { describe, it, expect, vi, beforeEach } from "vitest";
import { resolve } from "path";

// ------------------------------------------------------------------
// resolveVectorDbPath — test the standalone logic
// ------------------------------------------------------------------

function resolveVectorDbPath(config: {
  vector_store: { path: string };
}): string {
  const vsp = config.vector_store.path;
  if (vsp.startsWith("./obsidian-rag/") || vsp.includes("../"))
    return resolve(process.cwd(), vsp);
  if (vsp.startsWith("/") || /^[A-Za-z]:/.test(vsp)) return vsp;
  return resolve(process.cwd(), vsp);
}

const makeConfig = (vectorPath: string) => ({
  vault_path: "./KnowledgeVault/Default",
  embedding: {
    provider: "ollama",
    model: "mxbai-embed-large",
    base_url: "http://localhost:11434",
    dimensions: 1024,
    batch_size: 64,
  },
  vector_store: { type: "lancedb", path: vectorPath },
  indexing: {
    chunk_size: 500,
    chunk_overlap: 100,
    file_patterns: ["*.md"],
    deny_dirs: [],
    allow_dirs: [],
  },
  security: {
    require_confirmation_for: [],
    sensitive_sections: [],
    local_only: true,
  },
  memory: {
    auto_suggest: true,
    patterns: { financial: [], health: [], commitments: [] },
  },
});

describe("resolveVectorDbPath", () => {
  it("returns absolute paths unchanged", () => {
    const result = resolveVectorDbPath(makeConfig("/absolute/path/to/db.lance"));
    expect(result).toBe("/absolute/path/to/db.lance");
  });

  it("resolves relative paths against cwd", () => {
    const result = resolveVectorDbPath(makeConfig("./local/path.db"));
    expect(result).toContain("local/path.db");
  });

  it("detects nested obsidian-rag path prefix", () => {
    const result = resolveVectorDbPath(makeConfig("./obsidian-rag/vectors.lance"));
    expect(result).toContain("obsidian-rag/vectors.lance");
  });

  it("resolves parent traversal paths normally (resolve() strips ..)", () => {
    // After resolve(), ../escape/path.db becomes /cwd/escape/path.db
    // The function resolves it as-is; the TS path is a simple passthrough
    const result = resolveVectorDbPath(makeConfig("../escape/path.db"));
    expect(result).toContain("escape");
  });
});

// ------------------------------------------------------------------
// embedQuery — test the standalone logic
// ------------------------------------------------------------------

async function embedQuery(
  text: string,
  config: { embedding: { base_url: string; model: string } }
): Promise<number[]> {
  const url = `${config.embedding.base_url}/api/embeddings`;
  const response = await fetch(url, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ model: config.embedding.model, prompt: text }),
    signal: AbortSignal.timeout(30_000),
  });
  if (!response.ok) {
    throw new Error(
      `Embedding request failed: ${response.status} ${response.statusText}`
    );
  }
  const data = (await response.json()) as {
    embedding?: number[];
    embeddings?: number[][];
  };
  return data.embedding ?? data.embeddings?.[0] ?? [];
}

describe("embedQuery", () => {
  beforeEach(() => {
    global.fetch = vi.fn();
  });

  it("posts to the correct embeddings endpoint", async () => {
    (global.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce({
      ok: true,
      json: async () => ({ embedding: [0.1, 0.2, 0.3] }),
    } as Response);

    const config = makeConfig("./vectors.lance");
    await embedQuery("hello world", config);

    expect(global.fetch).toHaveBeenCalledWith(
      "http://localhost:11434/api/embeddings",
      expect.objectContaining({
        method: "POST",
        body: JSON.stringify({
          model: "mxbai-embed-large",
          prompt: "hello world",
        }),
      })
    );
  });

  it("throws on non-ok response", async () => {
    (global.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce({
      ok: false,
      status: 500,
      statusText: "Internal Server Error",
    } as Response);

    await expect(
      embedQuery("test", makeConfig("./vectors.lance"))
    ).rejects.toThrow("Embedding request failed: 500 Internal Server Error");
  });

  it("falls back to embeddings[0] when top-level embedding absent", async () => {
    (global.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce({
      ok: true,
      json: async () => ({ embeddings: [[0.5, 0.6, 0.7]] }),
    } as Response);

    const result = await embedQuery("test", makeConfig("./vectors.lance"));
    expect(result).toEqual([0.5, 0.6, 0.7]);
  });

  it("returns empty array when no embedding in response", async () => {
    (global.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce({
      ok: true,
      json: async () => ({}),
    } as Response);

    const result = await embedQuery("test", makeConfig("./vectors.lance"));
    expect(result).toEqual([]);
  });
});