const RANGE_1 = 1;
const RANGE_2 = 2;

function testBlob(file, contents, testName) {
  // Load file using FileReader
  return (
    new Promise(resolve => {
      let r = new FileReader();
      r.onload = event => {
        is(
          event.target.readyState,
          FileReader.DONE,
          "[FileReader] readyState in test FileReader.readAsBinaryString of " +
            testName
        );
        is(
          event.target.error,
          null,
          "[FileReader] no error in test FileReader.readAsBinaryString of " +
            testName
        );
        // Do not use |is(event.target.result, contents, "...");| that may output raw binary data.
        is(
          event.target.result.length,
          contents.length,
          "[FileReader] Length of result in test FileReader.readAsBinaryString of " +
            testName
        );
        ok(
          event.target.result == contents,
          "[FileReader] Content of result in test FileReader.readAsBinaryString of " +
            testName
        );
        is(
          event.lengthComputable,
          true,
          "[FileReader] lengthComputable in test FileReader.readAsBinaryString of " +
            testName
        );
        is(
          event.loaded,
          contents.length,
          "[FileReader] Loaded length in test FileReader.readAsBinaryString of " +
            testName
        );
        is(
          event.total,
          contents.length,
          "[FileReader] Total length in test FileReader.readAsBinaryString of " +
            testName
        );
        resolve();
      };
      r.readAsBinaryString(file);
    })

      // Load file using URL.createObjectURL and XMLHttpRequest
      .then(() => {
        return new Promise(resolve => {
          let xhr = new XMLHttpRequest();
          xhr.open("GET", URL.createObjectURL(file));
          xhr.onload = event => {
            XHRLoadHandler(
              event,
              resolve,
              contents,
              "XMLHttpRequest load of " + testName
            );
          };
          xhr.overrideMimeType("text/plain; charset=x-user-defined");
          xhr.send();
        });
      })

      // Send file to server using FormData and XMLHttpRequest
      .then(() => {
        return new Promise(resolve => {
          let xhr = new XMLHttpRequest();
          xhr.onload = function(event) {
            checkMPSubmission(JSON.parse(event.target.responseText), [
              { name: "hello", value: "world" },
              {
                name: "myfile",
                value: contents,
                fileName: file.name || "blob",
                contentType: file.type || "application/octet-stream",
              },
            ]);
            resolve();
          };
          xhr.open("POST", "../../../dom/html/test/form_submit_server.sjs");

          let fd = new FormData();
          fd.append("hello", "world");
          fd.append("myfile", file);

          xhr.send(fd);
        });
      })

      // Send file to server using plain XMLHttpRequest
      .then(() => {
        return new Promise(resolve => {
          let xhr = new XMLHttpRequest();
          xhr.open("POST", "../../../dom/xhr/tests/file_XHRSendData.sjs");

          xhr.onload = function(event) {
            is(
              event.target.getResponseHeader("Result-Content-Type"),
              file.type ? file.type : null,
              "request content-type in XMLHttpRequest send of " + testName
            );
            is(
              event.target.getResponseHeader("Result-Content-Length"),
              String(file.size),
              "request content-length in XMLHttpRequest send of " + testName
            );
          };

          xhr.addEventListener("load", event => {
            XHRLoadHandler(
              event,
              resolve,
              contents,
              "XMLHttpRequest send of " + testName
            );
          });
          xhr.overrideMimeType("text/plain; charset=x-user-defined");
          xhr.send(file);
        });
      })
  );
}

function testSlice(file, size, type, contents, fileType, range) {
  is(file.type, type, fileType + " file is correct type");
  is(file.size, size, fileType + " file is correct size");
  if (fileType == "fileFile") {
    ok(file instanceof File, fileType + " file is a File");
  } else if (fileType == "memFile") {
    ok(!(file instanceof File), fileType + " file is not a File");
  }
  ok(file instanceof Blob, fileType + " file is also a Blob");

  let slice = file.slice(0, size);
  ok(slice instanceof Blob, fileType + " fullsize slice is a Blob");
  ok(!(slice instanceof File), fileType + " fullsize slice is not a File");

  slice = file.slice(0, 1234);
  ok(slice instanceof Blob, fileType + " sized slice is a Blob");
  ok(!(slice instanceof File), fileType + " sized slice is not a File");

  slice = file.slice(0, size, "foo/bar");
  is(slice.type, "foo/bar", fileType + " fullsize slice foo/bar type");

  slice = file.slice(0, 5432, "foo/bar");
  is(slice.type, "foo/bar", fileType + " sized slice foo/bar type");

  is(slice.slice(0, 10).type, "", fileType + " slice-slice type");
  is(slice.slice(0, 10).size, 10, fileType + " slice-slice size");
  is(
    slice.slice(0, 10, "hello/world").type,
    "hello/world",
    fileType + " slice-slice hello/world type"
  );
  is(
    slice.slice(0, 10, "hello/world").size,
    10,
    fileType + " slice-slice hello/world size"
  );

  // Start, end, expected size
  var indexes_range_1 = [
    [0, size, size],
    [0, 1234, 1234],
    [size - 500, size, 500],
    [size - 500, size + 500, 500],
    [size + 500, size + 1500, 0],
    [0, 0, 0],
    [1000, 1000, 0],
    [size, size, 0],
    [undefined, undefined, size],
    [0, undefined, size],
  ];

  var indexes_range_2 = [
    [100, undefined, size - 100],
    [-100, undefined, 100],
    [100, -100, size - 200],
    [-size - 100, undefined, size],
    [-2 * size - 100, 500, 500],
    [0, -size - 100, 0],
    [100, -size - 100, 0],
    [50, -size + 100, 50],
    [0, 33000, 33000],
    [1000, 34000, 33000],
  ];

  let indexes;
  if (range == RANGE_1) {
    indexes = indexes_range_1;
  } else if (range == RANGE_2) {
    indexes = indexes_range_2;
  } else {
    throw "Invalid range!";
  }

  function runNextTest() {
    if (!indexes.length) {
      return Promise.resolve(true);
    }

    let index = indexes.shift();

    let sliceContents;
    let testName;
    if (index[0] == undefined) {
      slice = file.slice();
      sliceContents = contents.slice();
      testName = fileType + " slice()";
    } else if (index[1] == undefined) {
      slice = file.slice(index[0]);
      sliceContents = contents.slice(index[0]);
      testName = fileType + " slice(" + index[0] + ")";
    } else {
      slice = file.slice(index[0], index[1]);
      sliceContents = contents.slice(index[0], index[1]);
      testName = fileType + " slice(" + index[0] + ", " + index[1] + ")";
    }

    is(slice.type, "", testName + " type");
    is(slice.size, index[2], testName + " size");
    is(sliceContents.length, index[2], testName + " data size");

    return testBlob(slice, sliceContents, testName).then(runNextTest);
  }

  return runNextTest()
    .then(() => {
      // Slice of slice
      let sliceOfSlice = file.slice(0, 40000);
      return testBlob(
        sliceOfSlice.slice(5000, 42000),
        contents.slice(5000, 40000),
        "file slice slice"
      );
    })
    .then(() => {
      // ...of slice of slice
      let sliceOfSlice = file
        .slice(0, 40000)
        .slice(5000, 42000)
        .slice(400, 700);
      SpecialPowers.gc();
      return testBlob(
        sliceOfSlice,
        contents.slice(5400, 5700),
        "file slice slice slice"
      );
    });
}

function convertXHRBinary(s) {
  let res = "";
  for (let i = 0; i < s.length; ++i) {
    res += String.fromCharCode(s.charCodeAt(i) & 255);
  }
  return res;
}

function XHRLoadHandler(event, resolve, contents, testName) {
  is(event.target.readyState, 4, "[XHR] readyState in test " + testName);
  is(event.target.status, 200, "[XHR] no error in test " + testName);
  // Do not use |is(convertXHRBinary(event.target.responseText), contents, "...");| that may output raw binary data.
  let convertedData = convertXHRBinary(event.target.responseText);
  is(
    convertedData.length,
    contents.length,
    "[XHR] Length of result in test " + testName
  );
  ok(convertedData == contents, "[XHR] Content of result in test " + testName);
  is(
    event.lengthComputable,
    event.total != 0,
    "[XHR] lengthComputable in test " + testName
  );
  is(event.loaded, contents.length, "[XHR] Loaded length in test " + testName);
  is(event.total, contents.length, "[XHR] Total length in test " + testName);
  resolve();
}

function checkMPSubmission(sub, expected) {
  function getPropCount(o) {
    let x,
      l = 0;
    for (x in o) {
      ++l;
    }
    return l;
  }

  is(sub.length, expected.length, "Correct number of items");
  let i;
  for (i = 0; i < expected.length; ++i) {
    if (!("fileName" in expected[i])) {
      is(
        sub[i].headers["Content-Disposition"],
        'form-data; name="' + expected[i].name + '"',
        "Correct name (A)"
      );
      is(getPropCount(sub[i].headers), 1, "Wrong number of headers (A)");
    } else {
      is(
        sub[i].headers["Content-Disposition"],
        'form-data; name="' +
          expected[i].name +
          '"; filename="' +
          expected[i].fileName +
          '"',
        "Correct name (B)"
      );
      is(
        sub[i].headers["Content-Type"],
        expected[i].contentType,
        "Correct content type (B)"
      );
      is(getPropCount(sub[i].headers), 2, "Wrong number of headers (B)");
    }
    // Do not use |is(sub[i].body, expected[i].value, "...");| that may output raw binary data.
    is(sub[i].body.length, expected[i].value.length, "Length of correct value");
    ok(sub[i].body == expected[i].value, "Content of correct value");
  }
}

function createCanvasURL() {
  return new Promise(resolve => {
    // Create a decent-sized image
    let cx = $("canvas").getContext("2d");
    let s = cx.canvas.width;
    let grad = cx.createLinearGradient(0, 0, s - 1, s - 1);
    for (i = 0; i < 0.95; i += 0.1) {
      grad.addColorStop(i, "white");
      grad.addColorStop(i + 0.05, "black");
    }
    grad.addColorStop(1, "white");
    cx.fillStyle = grad;
    cx.fillRect(0, 0, s - 1, s - 1);
    cx.fillStyle = "rgba(200, 0, 0, 0.9)";
    cx.fillRect(0.1 * s, 0.1 * s, 0.7 * s, 0.7 * s);
    cx.strokeStyle = "rgba(0, 0, 130, 0.5)";
    cx.lineWidth = 0.14 * s;
    cx.beginPath();
    cx.arc(0.6 * s, 0.6 * s, 0.3 * s, 0, Math.PI * 2, true);
    cx.stroke();
    cx.closePath();
    cx.fillStyle = "rgb(0, 255, 0)";
    cx.beginPath();
    cx.arc(0.1 * s, 0.8 * s, 0.1 * s, 0, Math.PI * 2, true);
    cx.fill();
    cx.closePath();

    let data = atob(
      cx.canvas
        .toDataURL("image/png")
        .substring("data:text/png;base64,".length + 1)
    );

    // This might fail if we dramatically improve the png encoder. If that happens
    // please increase the complexity or size of the image generated above to ensure
    // that we're testing with files that are large enough.
    ok(data.length > 65536, "test data sufficiently large");

    resolve(data);
  });
}

function createFile(data, name) {
  return new Promise(resolve => {
    SpecialPowers.createFiles([{ name, data }], files => {
      resolve(files[0]);
    });
  });
}

function toBlobPromise(canvas) {
  function BlobListener(callback, file) {
    var reader = new FileReader();
    reader.onload = () => callback(file);
    reader.readAsDataURL(file);
  }

  return new Promise(resolve => {
    canvas.toBlob(BlobListener.bind(undefined, resolve));
  });
}