// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright The LanceDB Authors

import { Field, Int64, List, Schema, Struct, Utf8 } from "apache-arrow";
import { makeArrowTable } from "../lancedb/arrow";
import { BlobFile, blob, coerceBlobValue, isBlobField } from "../lancedb/blob";

describe("blob()", () => {
  it("marks the field as lance.blob.v2", () => {
    const field = blob("image", { nullable: false });
    expect(field.nullable).toBe(false);
    expect(isBlobField(field)).toBe(true);
    expect(field.metadata.get("ARROW:extension:name")).toBe("lance.blob.v2");
  });

  it("writes encoding thresholds as field metadata", () => {
    const field = blob("video", {
      inlineSizeThreshold: 1024,
      dedicatedSizeThreshold: 2 * 1024 * 1024,
      packFileSizeThreshold: 64 * 1024 * 1024,
    });
    expect(
      field.metadata.get("lance-encoding:blob-inline-size-threshold"),
    ).toBe("1024");
    expect(
      field.metadata.get("lance-encoding:blob-dedicated-size-threshold"),
    ).toBe(String(2 * 1024 * 1024));
    expect(
      field.metadata.get("lance-encoding:blob-pack-file-size-threshold"),
    ).toBe(String(64 * 1024 * 1024));
  });

  it("rejects invalid thresholds", () => {
    expect(() => blob("image", { inlineSizeThreshold: -1 })).toThrow(
      /inlineSizeThreshold must be non-negative/,
    );
    expect(() => blob("image", { dedicatedSizeThreshold: 0 })).toThrow(
      /dedicatedSizeThreshold must be positive/,
    );
    expect(() => blob("image", { packFileSizeThreshold: 1.5 })).toThrow(
      /packFileSizeThreshold must be a safe integer/,
    );
    expect(() =>
      blob("image", { dedicatedSizeThreshold: Number.MAX_SAFE_INTEGER + 1 }),
    ).toThrow(/dedicatedSizeThreshold must be a safe integer/);
  });
});

describe("coerceBlobValue", () => {
  it.each([
    ["Buffer", Buffer.from("x"), { data: Buffer.from("x"), uri: null }],
    [
      "Uint8Array",
      new Uint8Array([120]),
      { data: new Uint8Array([120]), uri: null },
    ],
    ["URI string", "s3://bucket/key", { data: null, uri: "s3://bucket/key" }],
    [
      "data struct",
      { data: Buffer.from("y") },
      { data: Buffer.from("y"), uri: null },
    ],
    [
      "uri struct",
      { uri: "s3://bucket/key" },
      { data: null, uri: "s3://bucket/key" },
    ],
    ["null", null, null],
  ])("accepts %s", (_name, input, expected) => {
    expect(coerceBlobValue(input)).toEqual(expected);
  });

  it.each([
    ["empty URI", "", /uri cannot be empty/],
    ["object without data or uri", { position: 0 }, /data' or 'uri/],
    [
      "Int16Array",
      new Int16Array([1]),
      /Blob data must be Buffer or Uint8Array/,
    ],
    [
      "both data and uri",
      { data: Buffer.from("y"), uri: "s3://bucket/key" },
      /exactly one of 'data' or 'uri'/,
    ],
    [
      "neither data nor uri",
      { data: null, uri: null },
      /exactly one of 'data' or 'uri'/,
    ],
  ])("rejects %s", (_name, input, message) => {
    expect(() => coerceBlobValue(input)).toThrow(message);
  });
});

describe("BlobFile", () => {
  it("rejects constructing BlobFile without a native handle", () => {
    expect(() => new (BlobFile as unknown as { new (): BlobFile })()).toThrow(
      /fetchBlobFiles/,
    );
  });
});

describe("makeArrowTable blob columns", () => {
  it("coerces Buffer input onto a blob field", () => {
    const schema = new Schema([
      new Field("id", new Int64(), true),
      blob("image"),
    ]);
    const table = makeArrowTable([{ id: 1n, image: Buffer.from("hello") }], {
      schema,
    });
    expect(isBlobField(table.schema.fields[1])).toBe(true);
    const image = table.getChild("image")!;
    expect(image.nullCount).toBe(0);
    expect(image.getChild("uri")!.get(0)).toBeNull();
    expect(image.getChild("data")!.nullCount).toBe(0);
    expect(Buffer.from(image.getChild("data")!.get(0)!).toString()).toBe(
      "hello",
    );
  });

  it("coerces Buffer elements inside a list and keeps null slots", () => {
    const schema = new Schema([
      new Field("id", new Int64(), true),
      new Field("images", new List(blob("image")), true),
    ]);
    const table = makeArrowTable(
      [
        { id: 1n, images: [Buffer.from("a"), Buffer.from("bb")] },
        { id: 2n, images: null },
        { id: 3n, images: [Buffer.from("c"), null] },
        { id: 4n, images: [] },
      ],
      { schema },
    );
    const images = table.getChild("images")!;
    expect(images.nullCount).toBe(1);
    const rows = images.toArray();
    expect(rows[1]).toBeNull();
    expect(Array.from(rows[3] as Iterable<unknown>)).toHaveLength(0);
    const first = Array.from(rows[0] as Iterable<{ data: Uint8Array | null }>);
    expect(Buffer.from(first[0].data!).toString()).toBe("a");
    expect(Buffer.from(first[1].data!).toString()).toBe("bb");
    const third = Array.from(
      rows[2] as Iterable<{ data: Uint8Array | null } | null>,
    );
    expect(Buffer.from(third[0]!.data!).toString()).toBe("c");
    expect(third[1]).toBeNull();
  });

  it("coerces Buffer fields inside list structs", () => {
    const schema = new Schema([
      new Field("id", new Int64(), true),
      new Field(
        "items",
        new List(
          new Field(
            "item",
            new Struct([new Field("name", new Utf8(), true), blob("image")]),
            true,
          ),
        ),
        true,
      ),
    ]);
    const table = makeArrowTable(
      [
        {
          id: 1n,
          items: [{ name: "one", image: Buffer.from("alpha") }],
        },
      ],
      { schema },
    );
    const items = Array.from(
      table.getChild("items")!.toArray()[0] as Iterable<{
        name: string;
        image: { data: Uint8Array | null };
      }>,
    );
    expect(items[0].name).toBe("one");
    expect(Buffer.from(items[0].image.data!).toString()).toBe("alpha");
  });
});