/* Copyright 2017 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {
  bytesToString,
  createPromiseCapability,
  createValidAbsoluteUrl,
  isArrayBuffer,
  isBool,
  isEmptyObj,
  isNum,
  isSameOrigin,
  isSpace,
  isString,
  log2,
  removeNullCharacters,
  string32,
  stringToBytes,
  stringToPDFString,
} from "../../src/shared/util";

describe("util", function() {
  describe("bytesToString", function() {
    it("handles non-array arguments", function() {
      expect(function() {
        bytesToString(null);
      }).toThrow(new Error("Invalid argument for bytesToString"));
    });

    it("handles array arguments with a length not exceeding the maximum", function() {
      expect(bytesToString(new Uint8Array([]))).toEqual("");
      expect(bytesToString(new Uint8Array([102, 111, 111]))).toEqual("foo");
    });

    it("handles array arguments with a length exceeding the maximum", function() {
      const length = 10000; // Larger than MAX_ARGUMENT_COUNT = 8192.

      // Create an array with `length` 'a' character codes.
      let bytes = new Uint8Array(length);
      for (let i = 0; i < length; i++) {
        bytes[i] = "a".charCodeAt(0);
      }

      // Create a string with `length` 'a' characters. We need an array of size
      // `length + 1` since `join` puts the argument between the array elements.
      let string = Array(length + 1).join("a");

      expect(bytesToString(bytes)).toEqual(string);
    });
  });

  describe("isArrayBuffer", function() {
    it("handles array buffer values", function() {
      expect(isArrayBuffer(new ArrayBuffer(0))).toEqual(true);
      expect(isArrayBuffer(new Uint8Array(0))).toEqual(true);
    });

    it("handles non-array buffer values", function() {
      expect(isArrayBuffer("true")).toEqual(false);
      expect(isArrayBuffer(1)).toEqual(false);
      expect(isArrayBuffer(null)).toEqual(false);
      expect(isArrayBuffer(undefined)).toEqual(false);
    });
  });

  describe("isBool", function() {
    it("handles boolean values", function() {
      expect(isBool(true)).toEqual(true);
      expect(isBool(false)).toEqual(true);
    });

    it("handles non-boolean values", function() {
      expect(isBool("true")).toEqual(false);
      expect(isBool("false")).toEqual(false);
      expect(isBool(1)).toEqual(false);
      expect(isBool(0)).toEqual(false);
      expect(isBool(null)).toEqual(false);
      expect(isBool(undefined)).toEqual(false);
    });
  });

  describe("isEmptyObj", function() {
    it("handles empty objects", function() {
      expect(isEmptyObj({})).toEqual(true);
    });

    it("handles non-empty objects", function() {
      expect(isEmptyObj({ foo: "bar" })).toEqual(false);
    });
  });

  describe("isNum", function() {
    it("handles numeric values", function() {
      expect(isNum(1)).toEqual(true);
      expect(isNum(0)).toEqual(true);
      expect(isNum(-1)).toEqual(true);
      expect(isNum(1000000000000000000)).toEqual(true);
      expect(isNum(12.34)).toEqual(true);
    });

    it("handles non-numeric values", function() {
      expect(isNum("true")).toEqual(false);
      expect(isNum(true)).toEqual(false);
      expect(isNum(null)).toEqual(false);
      expect(isNum(undefined)).toEqual(false);
    });
  });

  describe("isSpace", function() {
    it("handles space characters", function() {
      expect(isSpace(0x20)).toEqual(true);
      expect(isSpace(0x09)).toEqual(true);
      expect(isSpace(0x0d)).toEqual(true);
      expect(isSpace(0x0a)).toEqual(true);
    });

    it("handles non-space characters", function() {
      expect(isSpace(0x0b)).toEqual(false);
      expect(isSpace(null)).toEqual(false);
      expect(isSpace(undefined)).toEqual(false);
    });
  });

  describe("isString", function() {
    it("handles string values", function() {
      expect(isString("foo")).toEqual(true);
      expect(isString("")).toEqual(true);
    });

    it("handles non-string values", function() {
      expect(isString(true)).toEqual(false);
      expect(isString(1)).toEqual(false);
      expect(isString(null)).toEqual(false);
      expect(isString(undefined)).toEqual(false);
    });
  });

  describe("log2", function() {
    it("handles values smaller than/equal to zero", function() {
      expect(log2(0)).toEqual(0);
      expect(log2(-1)).toEqual(0);
    });

    it("handles values larger than zero", function() {
      expect(log2(1)).toEqual(0);
      expect(log2(2)).toEqual(1);
      expect(log2(3)).toEqual(2);
      expect(log2(3.14)).toEqual(2);
    });
  });

  describe("string32", function() {
    it("converts unsigned 32-bit integers to strings", function() {
      expect(string32(0x74727565)).toEqual("true");
      expect(string32(0x74797031)).toEqual("typ1");
      expect(string32(0x4f54544f)).toEqual("OTTO");
    });
  });

  describe("stringToBytes", function() {
    it("handles non-string arguments", function() {
      expect(function() {
        stringToBytes(null);
      }).toThrow(new Error("Invalid argument for stringToBytes"));
    });

    it("handles string arguments", function() {
      expect(stringToBytes("")).toEqual(new Uint8Array([]));
      expect(stringToBytes("foo")).toEqual(new Uint8Array([102, 111, 111]));
    });
  });

  describe("stringToPDFString", function() {
    it("handles ISO Latin 1 strings", function() {
      let str = "\x8Dstring\x8E";
      expect(stringToPDFString(str)).toEqual("\u201Cstring\u201D");
    });

    it("handles UTF-16 big-endian strings", function() {
      let str = "\xFE\xFF\x00\x73\x00\x74\x00\x72\x00\x69\x00\x6E\x00\x67";
      expect(stringToPDFString(str)).toEqual("string");
    });

    it("handles UTF-16 little-endian strings", function() {
      let str = "\xFF\xFE\x73\x00\x74\x00\x72\x00\x69\x00\x6E\x00\x67\x00";
      expect(stringToPDFString(str)).toEqual("string");
    });

    it("handles empty strings", function() {
      // ISO Latin 1
      let str1 = "";
      expect(stringToPDFString(str1)).toEqual("");

      // UTF-16BE
      let str2 = "\xFE\xFF";
      expect(stringToPDFString(str2)).toEqual("");

      // UTF-16LE
      let str3 = "\xFF\xFE";
      expect(stringToPDFString(str3)).toEqual("");
    });
  });

  describe("removeNullCharacters", function() {
    it("should not modify string without null characters", function() {
      let str = "string without null chars";
      expect(removeNullCharacters(str)).toEqual("string without null chars");
    });

    it("should modify string with null characters", function() {
      let str = "string\x00With\x00Null\x00Chars";
      expect(removeNullCharacters(str)).toEqual("stringWithNullChars");
    });
  });

  describe("ReadableStream", function() {
    it("should return an Object", function() {
      let readable = new ReadableStream();
      expect(typeof readable).toEqual("object");
    });

    it("should have property getReader", function() {
      let readable = new ReadableStream();
      expect(typeof readable.getReader).toEqual("function");
    });
  });

  describe("URL", function() {
    it("should return an Object", function() {
      const url = new URL("https://example.com");
      expect(typeof url).toEqual("object");
    });

    it("should have property `href`", function() {
      const url = new URL("https://example.com");
      expect(typeof url.href).toEqual("string");
    });
  });

  describe("isSameOrigin", function() {
    it("handles invalid base URLs", function() {
      // The base URL is not valid.
      expect(isSameOrigin("/foo", "/bar")).toEqual(false);

      // The base URL has no origin.
      expect(isSameOrigin("blob:foo", "/bar")).toEqual(false);
    });

    it("correctly checks if the origin of both URLs matches", function() {
      expect(
        isSameOrigin(
          "https://www.mozilla.org/foo",
          "https://www.mozilla.org/bar"
        )
      ).toEqual(true);
      expect(
        isSameOrigin(
          "https://www.mozilla.org/foo",
          "https://www.example.com/bar"
        )
      ).toEqual(false);
    });
  });

  describe("createValidAbsoluteUrl", function() {
    it("handles invalid URLs", function() {
      expect(createValidAbsoluteUrl(undefined, undefined)).toEqual(null);
      expect(createValidAbsoluteUrl(null, null)).toEqual(null);
      expect(createValidAbsoluteUrl("/foo", "/bar")).toEqual(null);
    });

    it("handles URLs that do not use a whitelisted protocol", function() {
      expect(createValidAbsoluteUrl("magnet:?foo", null)).toEqual(null);
    });

    it("correctly creates a valid URL for whitelisted protocols", function() {
      // `http` protocol
      expect(
        createValidAbsoluteUrl("http://www.mozilla.org/foo", null)
      ).toEqual(new URL("http://www.mozilla.org/foo"));
      expect(createValidAbsoluteUrl("/foo", "http://www.mozilla.org")).toEqual(
        new URL("http://www.mozilla.org/foo")
      );

      // `https` protocol
      expect(
        createValidAbsoluteUrl("https://www.mozilla.org/foo", null)
      ).toEqual(new URL("https://www.mozilla.org/foo"));
      expect(createValidAbsoluteUrl("/foo", "https://www.mozilla.org")).toEqual(
        new URL("https://www.mozilla.org/foo")
      );

      // `ftp` protocol
      expect(createValidAbsoluteUrl("ftp://www.mozilla.org/foo", null)).toEqual(
        new URL("ftp://www.mozilla.org/foo")
      );
      expect(createValidAbsoluteUrl("/foo", "ftp://www.mozilla.org")).toEqual(
        new URL("ftp://www.mozilla.org/foo")
      );

      // `mailto` protocol (base URLs have no meaning and should yield `null`)
      expect(createValidAbsoluteUrl("mailto:foo@bar.baz", null)).toEqual(
        new URL("mailto:foo@bar.baz")
      );
      expect(createValidAbsoluteUrl("/foo", "mailto:foo@bar.baz")).toEqual(
        null
      );

      // `tel` protocol (base URLs have no meaning and should yield `null`)
      expect(createValidAbsoluteUrl("tel:+0123456789", null)).toEqual(
        new URL("tel:+0123456789")
      );
      expect(createValidAbsoluteUrl("/foo", "tel:0123456789")).toEqual(null);
    });
  });

  describe("createPromiseCapability", function() {
    it("should resolve with correct data", function(done) {
      const promiseCapability = createPromiseCapability();
      expect(promiseCapability.settled).toEqual(false);

      promiseCapability.resolve({ test: "abc" });

      promiseCapability.promise.then(function(data) {
        expect(promiseCapability.settled).toEqual(true);

        expect(data).toEqual({ test: "abc" });
        done();
      }, done.fail);
    });

    it("should reject with correct reason", function(done) {
      const promiseCapability = createPromiseCapability();
      expect(promiseCapability.settled).toEqual(false);

      promiseCapability.reject(new Error("reason"));

      promiseCapability.promise.then(done.fail, function(reason) {
        expect(promiseCapability.settled).toEqual(true);

        expect(reason instanceof Error).toEqual(true);
        expect(reason.message).toEqual("reason");
        done();
      });
    });
  });
});