import { spawnSync } from "node:child_process";
import { readFile, readdir } from "node:fs/promises";
import path from "node:path";

function requiredPnpmCli(): string {
  const executable = process.env.npm_execpath;
  if (!executable) {
    throw new Error(
      "check:browser-file-storage-boundaries must run through pnpm",
    );
  }
  return executable;
}

function runEslint(path: string) {
  return spawnSync(
    process.execPath,
    [
      requiredPnpmCli(),
      "exec",
      "eslint",
      path,
      "--no-ignore",
      "--max-warnings=0",
    ],
    { encoding: "utf8" },
  );
}

function runEslintSource(source: string, virtualPath: string) {
  return spawnSync(
    process.execPath,
    [
      requiredPnpmCli(),
      "exec",
      "eslint",
      "--stdin",
      "--stdin-filename",
      virtualPath,
      "--no-ignore",
      "--max-warnings=0",
    ],
    { encoding: "utf8", input: source },
  );
}

const allowed = runEslint(
  "tests/fixtures/browser-file-storage-boundaries/allowed",
);
const forbiddenRoot =
  "tests/fixtures/browser-file-storage-boundaries/forbidden";
const forbiddenFiles = (
  await readdir(forbiddenRoot, { withFileTypes: true })
)
  .filter((entry) => entry.isFile() && /\.tsx?$/u.test(entry.name))
  .map((entry) => path.join(forbiddenRoot, entry.name));
const forbiddenResults = forbiddenFiles.map((file) => ({
  file,
  result: runEslint(file),
}));
const acceptedForbidden = forbiddenResults.filter(
  ({ result }) => result.status === 0,
);
const indexedDbBypassSource = await readFile(
  path.join(forbiddenRoot, "direct-indexeddb.ts"),
  "utf8",
);
const objectUrlBypassSource = await readFile(
  path.join(forbiddenRoot, "object-url.ts"),
  "utf8",
);
const blobBypassSource = await readFile(
  path.join(forbiddenRoot, "direct-blob.ts"),
  "utf8",
);
const crossContextAdapterSource = await readFile(
  "tests/fixtures/browser-file-storage-boundaries/allowed/cross-context-host.ts",
  "utf8",
);
const browserStorageAdapterSource = await readFile(
  "tests/fixtures/browser-file-storage-boundaries/allowed/browser-storage-host.ts",
  "utf8",
);
const protectedSourceFixtureNames = [
  "aliased-globalthis.ts",
  "class-field-alias.ts",
  "constructor-root-escape.ts",
  "default-parameter-alias.ts",
  "direct-blob.ts",
  "dynamic-capability-key.ts",
  "global-object-container.ts",
  "identity-wrapped-global.ts",
  "instance-property-alias.ts",
  "property-descriptor-access.ts",
] as const;
const protectedSourceFixtures = await Promise.all(
  protectedSourceFixtureNames.map(async (file) => ({
    file,
    source: await readFile(path.join(forbiddenRoot, file), "utf8"),
  })),
);
const approvedAdapterResults = [
  {
    file: "src/adapters/storage/indexeddb/boundary-fixture.ts",
    result: runEslintSource(
      indexedDbBypassSource,
      "src/adapters/storage/indexeddb/boundary-fixture.ts",
    ),
  },
  {
    file: "src/adapters/cross-context-invalidation/boundary-fixture.ts",
    result: runEslintSource(
      crossContextAdapterSource,
      "src/adapters/cross-context-invalidation/boundary-fixture.ts",
    ),
  },
  {
    file: "src/adapters/storage/boundary-fixture.ts",
    result: runEslintSource(
      browserStorageAdapterSource,
      "src/adapters/storage/boundary-fixture.ts",
    ),
  },
  {
    file: "src/adapters/browser-transfer/boundary-fixture.ts",
    result: runEslintSource(
      blobBypassSource,
      "src/adapters/browser-transfer/boundary-fixture.ts",
    ),
  },
];
const rejectedApprovedAdapters = approvedAdapterResults.filter(
  ({ result }) => result.status !== 0,
);
const misplacedAdapterResults = [
  {
    file: "src/adapters/http/boundary-fixture.ts",
    result: runEslintSource(
      indexedDbBypassSource,
      "src/adapters/http/boundary-fixture.ts",
    ),
  },
  {
    file: "src/features/reference-feature/adapters/boundary-fixture.ts",
    result: runEslintSource(
      objectUrlBypassSource,
      "src/features/reference-feature/adapters/boundary-fixture.ts",
    ),
  },
  {
    file: "src/adapters/http/cross-context-boundary-fixture.ts",
    result: runEslintSource(
      crossContextAdapterSource,
      "src/adapters/http/cross-context-boundary-fixture.ts",
    ),
  },
  {
    file: "src/adapters/http/browser-storage-boundary-fixture.ts",
    result: runEslintSource(
      browserStorageAdapterSource,
      "src/adapters/http/browser-storage-boundary-fixture.ts",
    ),
  },
  ...protectedSourceFixtures.map(({ file, source }) => {
    const virtualPath = `src/presentation/${file}`;
    return {
      file: virtualPath,
      result: runEslintSource(source, virtualPath),
    };
  }),
];
const acceptedMisplacedAdapters = misplacedAdapterResults.filter(
  ({ result }) => result.status === 0,
);

if (
  allowed.status !== 0 ||
  rejectedApprovedAdapters.length > 0 ||
  forbiddenFiles.length === 0 ||
  acceptedForbidden.length > 0 ||
  acceptedMisplacedAdapters.length > 0
) {
  process.stderr.write(allowed.stderr || allowed.stdout);
  for (const { file, result } of rejectedApprovedAdapters) {
    process.stderr.write(
      `${file}: owned browser capability adapter was rejected\n`,
    );
    process.stderr.write(result.stderr || result.stdout);
  }
  for (const { file, result } of acceptedForbidden) {
    process.stderr.write(
      `${file}: forbidden browser API fixture was accepted\n`,
    );
    process.stderr.write(result.stderr || result.stdout);
  }
  for (const { file, result } of acceptedMisplacedAdapters) {
    process.stderr.write(
      `${file}: native browser storage access outside its owned adapter was accepted\n`,
    );
    process.stderr.write(result.stderr || result.stdout);
  }
  process.exit(1);
}

process.stdout.write(
  `Browser file/storage boundaries: PASS (owned adapter allowed, ${forbiddenFiles.length + misplacedAdapterResults.length} direct or misplaced native access cases rejected)\n`,
);