// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { assert, assertEquals, assertThrows, unitTest } from "./test_util.ts";

function assertMissing(path: string): void {
  let caughtErr = false;
  let info;
  try {
    info = Deno.lstatSync(path);
  } catch (e) {
    caughtErr = true;
    assert(e instanceof Deno.errors.NotFound);
  }
  assert(caughtErr);
  assertEquals(info, undefined);
}

function assertFile(path: string): void {
  const info = Deno.lstatSync(path);
  assert(info.isFile);
}

function assertDirectory(path: string, mode?: number): void {
  const info = Deno.lstatSync(path);
  assert(info.isDirectory);
  if (Deno.build.os !== "windows" && mode !== undefined) {
    assertEquals(info.mode! & 0o777, mode & ~Deno.umask());
  }
}

unitTest(
  { perms: { read: true, write: true } },
  function renameSyncSuccess(): void {
    const testDir = Deno.makeTempDirSync();
    const oldpath = testDir + "/oldpath";
    const newpath = testDir + "/newpath";
    Deno.mkdirSync(oldpath);
    Deno.renameSync(oldpath, newpath);
    assertDirectory(newpath);
    assertMissing(oldpath);
  },
);

unitTest(
  { perms: { read: false, write: true } },
  function renameSyncReadPerm(): void {
    assertThrows(() => {
      const oldpath = "/oldbaddir";
      const newpath = "/newbaddir";
      Deno.renameSync(oldpath, newpath);
    }, Deno.errors.PermissionDenied);
  },
);

unitTest(
  { perms: { read: true, write: false } },
  function renameSyncWritePerm(): void {
    assertThrows(() => {
      const oldpath = "/oldbaddir";
      const newpath = "/newbaddir";
      Deno.renameSync(oldpath, newpath);
    }, Deno.errors.PermissionDenied);
  },
);

unitTest(
  { perms: { read: true, write: true } },
  async function renameSuccess(): Promise<void> {
    const testDir = Deno.makeTempDirSync();
    const oldpath = testDir + "/oldpath";
    const newpath = testDir + "/newpath";
    Deno.mkdirSync(oldpath);
    await Deno.rename(oldpath, newpath);
    assertDirectory(newpath);
    assertMissing(oldpath);
  },
);

function readFileString(filename: string): string {
  const dataRead = Deno.readFileSync(filename);
  const dec = new TextDecoder("utf-8");
  return dec.decode(dataRead);
}

function writeFileString(filename: string, s: string): void {
  const enc = new TextEncoder();
  const data = enc.encode(s);
  Deno.writeFileSync(filename, data, { mode: 0o666 });
}

unitTest(
  { ignore: Deno.build.os === "windows", perms: { read: true, write: true } },
  function renameSyncErrorsUnix(): void {
    const testDir = Deno.makeTempDirSync();
    const oldfile = testDir + "/oldfile";
    const olddir = testDir + "/olddir";
    const emptydir = testDir + "/empty";
    const fulldir = testDir + "/dir";
    const file = fulldir + "/file";
    writeFileString(oldfile, "Hello");
    Deno.mkdirSync(olddir);
    Deno.mkdirSync(emptydir);
    Deno.mkdirSync(fulldir);
    writeFileString(file, "world");

    assertThrows(
      (): void => {
        Deno.renameSync(oldfile, emptydir);
      },
      Error,
      "Is a directory",
    );
    assertThrows(
      (): void => {
        Deno.renameSync(olddir, fulldir);
      },
      Error,
      "Directory not empty",
    );
    assertThrows(
      (): void => {
        Deno.renameSync(olddir, file);
      },
      Error,
      "Not a directory",
    );

    const fileLink = testDir + "/fileLink";
    const dirLink = testDir + "/dirLink";
    const danglingLink = testDir + "/danglingLink";
    Deno.symlinkSync(file, fileLink);
    Deno.symlinkSync(emptydir, dirLink);
    Deno.symlinkSync(testDir + "/nonexistent", danglingLink);

    assertThrows(
      (): void => {
        Deno.renameSync(olddir, fileLink);
      },
      Error,
      "Not a directory",
    );
    assertThrows(
      (): void => {
        Deno.renameSync(olddir, dirLink);
      },
      Error,
      "Not a directory",
    );
    assertThrows(
      (): void => {
        Deno.renameSync(olddir, danglingLink);
      },
      Error,
      "Not a directory",
    );

    // should succeed on Unix
    Deno.renameSync(olddir, emptydir);
    Deno.renameSync(oldfile, dirLink);
    Deno.renameSync(dirLink, danglingLink);
    assertFile(danglingLink);
    assertEquals("Hello", readFileString(danglingLink));
  },
);

unitTest(
  { ignore: Deno.build.os !== "windows", perms: { read: true, write: true } },
  function renameSyncErrorsWin(): void {
    const testDir = Deno.makeTempDirSync();
    const oldfile = testDir + "/oldfile";
    const olddir = testDir + "/olddir";
    const emptydir = testDir + "/empty";
    const fulldir = testDir + "/dir";
    const file = fulldir + "/file";
    writeFileString(oldfile, "Hello");
    Deno.mkdirSync(olddir);
    Deno.mkdirSync(emptydir);
    Deno.mkdirSync(fulldir);
    writeFileString(file, "world");

    assertThrows(
      (): void => {
        Deno.renameSync(oldfile, emptydir);
      },
      Deno.errors.PermissionDenied,
      "Access is denied",
    );
    assertThrows(
      (): void => {
        Deno.renameSync(olddir, fulldir);
      },
      Deno.errors.PermissionDenied,
      "Access is denied",
    );
    assertThrows(
      (): void => {
        Deno.renameSync(olddir, emptydir);
      },
      Deno.errors.PermissionDenied,
      "Access is denied",
    );

    // should succeed on Windows
    Deno.renameSync(olddir, file);
    assertDirectory(file);
  },
);