import { expect, it } from "vitest";
import { fat } from "../../../src/domain/binaryTarget.fixture.js";
import {
  createRustImage,
  createRustHashOverflowImage,
  RUSTC_HASH,
  rustDependencyPayload,
} from "../../fixtures/rust/image.js";
import { readRustBinaryImage } from "../../../src/rust/RustBinaryImage.js";
import { RustAuditableFormatFailure } from "../../../src/rust/RustAuditableReader.js";

const packages = [
  {
    name: "itoa",
    version: "1.0.18",
    source: "crates.io",
    kind: null,
    dependencies: [],
    root: false,
  },
  {
    name: "sample",
    version: "0.1.0",
    source: "local",
    kind: null,
    dependencies: [0],
    root: true,
  },
];

it.each(["elf", "pe"] as const)(
  "reads a .dep-v0 section and an inferred rustc hash from %s",
  (format) => {
    const image = readRustBinaryImage(createRustImage({ format }));
    expect(image.format).toBe(format);
    expect(image.auditable_metadata).toMatchObject({
      section_name: ".dep-v0",
      file_offset: 1024,
      section_bytes: rustDependencyPayload().length,
      format_version: 1,
      root_package_index: 1,
      packages,
      dependency_edges: [{ from_index: 1, to_index: 0 }],
    });
    expect(image.rustc_commit).toEqual({
      evidence_kind: "inferred",
      hashes: [{ hash: RUSTC_HASH, file_offset: 2048 }],
    });
  },
);

it("reads a Mach-O __DATA,.dep-v0 section", () => {
  const image = readRustBinaryImage(createRustImage({ format: "macho" }));
  expect(image).toMatchObject({
    format: "macho",
    architecture: "arm64",
    auditable_metadata: {
      section_name: "__DATA,.dep-v0",
      file_offset: 1024,
      root_package_index: 1,
      packages,
    },
    rustc_commit: {
      evidence_kind: "inferred",
      hashes: [{ hash: RUSTC_HASH, file_offset: 2048 }],
    },
  });
});

it("ignores PE file-alignment padding after the dependency content", () => {
  const bytes = createRustImage({ format: "pe", includeRustc: false });
  const payloadBytes = rustDependencyPayload().length;
  const entry = 264;
  expect(bytes.readUInt32LE(entry + 8)).toBe(payloadBytes);
  bytes.writeUInt32LE(512, entry + 16);
  const image = readRustBinaryImage(bytes);
  expect(image.auditable_metadata).toMatchObject({
    section_name: ".dep-v0",
    section_bytes: payloadBytes,
    packages,
  });
});

it("returns null metadata when the dependency section is absent", () => {
  const image = readRustBinaryImage(
    createRustImage({ format: "elf", omitSection: true }),
  );
  expect(image.auditable_metadata).toBeNull();
  expect(image.rustc_commit?.hashes).toEqual([
    { hash: RUSTC_HASH, file_offset: 2048 },
  ]);
});

it("refuses a universal Mach-O container", () => {
  expect(() => readRustBinaryImage(fat([0x0100000c]))).toThrow(
    RustAuditableFormatFailure,
  );
  expect(() => readRustBinaryImage(fat([0x0100000c]))).toThrow(/thin slice/);
});

it("does not read SHT_NOBITS dependency sections as stored bytes", () => {
  const bytes = createRustImage({ format: "elf" });
  // The fixture writes the .dep-v0 section header at byte 384.
  bytes.writeUInt32LE(8, 384 + 4);
  let metadata: unknown;
  try {
    metadata = readRustBinaryImage(bytes).auditable_metadata;
  } catch (cause: unknown) {
    expect(cause).toBeInstanceOf(RustAuditableFormatFailure);
    return;
  }
  expect(metadata).toBeNull();
});

it("reads a rustc path from a read-only ELF section whose name exceeds 64 bytes", () => {
  const bytes = createRustImage({ format: "elf", omitSection: true });
  // omitSection places the rustc section header at 384 and shstrtab at 320.
  const nameOffset = bytes.readUInt32LE(384);
  const tableOffset = Number(bytes.readBigUInt64LE(320 + 24));
  const longName = Buffer.concat([Buffer.alloc(65, 0x61), Buffer.from([0])]);
  longName.copy(bytes, tableOffset + nameOffset);
  bytes.writeBigUInt64LE(BigInt(nameOffset + longName.length), 320 + 32);
  const image = readRustBinaryImage(bytes);
  expect(image.auditable_metadata).toBeNull();
  expect(image.rustc_commit).toEqual({
    evidence_kind: "inferred",
    hashes: [{ hash: RUSTC_HASH, file_offset: 2048 }],
  });
});

it("refuses read-only data with more distinct rustc paths than it retains", () => {
  const bytes = createRustHashOverflowImage();
  expect(() => readRustBinaryImage(bytes)).toThrow(
    expect.objectContaining({
      constraint: {
        resource: "capacity",
        reported_limits: { maximum_rustc_hashes: 64 },
      },
    }),
  );
});