/**
 * Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

const NS_ERROR_STORAGE_BUSY = SpecialPowers.Cr.NS_ERROR_STORAGE_BUSY;

var testGenerator = testSteps();

function clearAllDatabases(callback)
{
  let qms = SpecialPowers.Services.qms;
  let principal = SpecialPowers.wrap(document).nodePrincipal;
  let request = qms.clearStoragesForPrincipal(principal);
  let cb = SpecialPowers.wrapCallback(callback);
  request.callback = cb;
}

var testHarnessGenerator = testHarnessSteps();
testHarnessGenerator.next();

function* testHarnessSteps()
{
  function nextTestHarnessStep(val)
  {
    testHarnessGenerator.next(val);
  }

  let testScriptPath;
  let testScriptFilename;

  let scripts = document.getElementsByTagName("script");
  for (let i = 0; i < scripts.length; i++) {
    let src = scripts[i].src;
    let match = src.match(/quota\/test\/unit\/(test_[^\/]+\.js)$/);
    if (match && match.length == 2) {
      testScriptPath = src;
      testScriptFilename = match[1];
      break;
    }
  }

  yield undefined;

  info("Pushing preferences");

  SpecialPowers.pushPrefEnv(
    {
      "set": [
        ["dom.storageManager.enabled", true],
        ["dom.storageManager.prompt.testing", true],
        ["dom.simpleDB.enabled", true],
      ]
    },
    nextTestHarnessStep
  );
  yield undefined;

  info("Clearing old databases");

  clearAllDatabases(nextTestHarnessStep);
  yield undefined;

  info("Running" +
       (testScriptFilename ? " '" + testScriptFilename + "'" : ""));

  if (testScriptFilename && !window.disableWorkerTest) {
    info("Running test in a worker");

    let workerScriptBlob =
      new Blob([ "(" + workerScript.toString() + ")();" ],
               { type: "text/javascript" });
    let workerScriptURL = URL.createObjectURL(workerScriptBlob);

    let worker = new Worker(workerScriptURL);

    worker.onerror = function(event) {
      ok(false, "Worker had an error: " + event.message);
      worker.terminate();
      nextTestHarnessStep();
    };

    worker.onmessage = function(event) {
      let message = event.data;
      switch (message.op) {
        case "ok":
          ok(message.condition, message.name, message.diag);
          break;

        case "todo":
          todo(message.condition, message.name, message.diag);
          break;

        case "info":
          info(message.msg);
          break;

        case "ready":
          worker.postMessage({ op: "load", files: [ testScriptPath ] });
          break;

        case "loaded":
          worker.postMessage({ op: "start" });
          break;

        case "done":
          ok(true, "Worker finished");
          nextTestHarnessStep();
          break;

        case "clearAllDatabases":
          clearAllDatabases(function(){
            worker.postMessage({ op: "clearAllDatabasesDone" });
          });
          break;

        default:
          ok(false,
             "Received a bad message from worker: " + JSON.stringify(message));
          nextTestHarnessStep();
      }
    };

    URL.revokeObjectURL(workerScriptURL);

    yield undefined;

    worker.terminate();
    worker = null;

    clearAllDatabases(nextTestHarnessStep);
    yield undefined;
  } else if (testScriptFilename) {
    todo(false,
         "Skipping test in a worker because it is explicitly disabled: " +
         disableWorkerTest);
  } else {
    todo(false,
         "Skipping test in a worker because it's not structured properly");
  }

  info("Running test in main thread");

  let script = document.createElement("script");
  script.src = "head-shared.js";
  script.onload = nextTestHarnessStep;
  document.head.appendChild(script);
  yield undefined;

  // Now run the test script in the main thread.
  testGenerator.next();

  yield undefined;
}

if (!window.runTest) {
  window.runTest = function()
  {
    SimpleTest.waitForExplicitFinish();
    testHarnessGenerator.next();
  }
}

function finishTest()
{
  SimpleTest.executeSoon(function() {
    clearAllDatabases(function() { SimpleTest.finish(); });
  });
}

function grabArgAndContinueHandler(arg)
{
  testGenerator.next(arg);
}

function continueToNextStep()
{
  SimpleTest.executeSoon(function() {
    testGenerator.next();
  });
}

function continueToNextStepSync()
{
  testGenerator.next();
}

function workerScript()
{
  "use strict";

  self.repr = function(_thing_) {
    if (typeof(_thing_) == "undefined") {
      return "undefined";
    }

    let str;

    try {
      str = _thing_ + "";
    } catch (e) {
      return "[" + typeof(_thing_) + "]";
    }

    if (typeof(_thing_) == "function") {
      str = str.replace(/^\s+/, "");
      let idx = str.indexOf("{");
      if (idx != -1) {
        str = str.substr(0, idx) + "{...}";
      }
    }

    return str;
  };

  self.ok = function(_condition_, _name_, _diag_) {
    self.postMessage({ op: "ok",
                       condition: !!_condition_,
                       name: _name_,
                       diag: _diag_ });
  };

  self.is = function(_a_, _b_, _name_) {
    let pass = (_a_ == _b_);
    let diag = pass ? "" : "got " + repr(_a_) + ", expected " + repr(_b_);
    ok(pass, _name_, diag);
  };

  self.isnot = function(_a_, _b_, _name_) {
    let pass = (_a_ != _b_);
    let diag = pass ? "" : "didn't expect " + repr(_a_) + ", but got it";
    ok(pass, _name_, diag);
  };

  self.todo = function(_condition_, _name_, _diag_) {
    self.postMessage({ op: "todo",
                       condition: !!_condition_,
                       name: _name_,
                       diag: _diag_ });
  };

  self.info = function(_msg_) {
    self.postMessage({ op: "info", msg: _msg_ });
  };

  self.executeSoon = function(_fun_) {
    var channel = new MessageChannel();
    channel.port1.postMessage("");
    channel.port2.onmessage = function(event) { _fun_(); };
  };

  self.finishTest = function() {
    self.postMessage({ op: "done" });
  };

  self.grabArgAndContinueHandler = function(_arg_) {
    testGenerator.next(_arg_);
  };

  self.continueToNextStep = function() {
    executeSoon(function() {
      testGenerator.next();
    });
  };

  self.continueToNextStepSync = function() {
    testGenerator.next();
  };

  self._clearAllDatabasesCallback = undefined;
  self.clearAllDatabases = function(_callback_) {
    self._clearAllDatabasesCallback = _callback_;
    self.postMessage({ op: "clearAllDatabases" });
  }

  self.onerror = function(_message_, _file_, _line_) {
    ok(false,
       "Worker: uncaught exception [" + _file_ + ":" + _line_ + "]: '" +
         _message_ + "'");
    self.finishTest();
    self.close();
    return true;
  };

  self.onmessage = function(_event_) {
    let message = _event_.data;
    switch (message.op) {
      case "load":
        info("Worker: loading " + JSON.stringify(message.files));
        self.importScripts(message.files);
        self.postMessage({ op: "loaded" });
        break;

      case "start":
        executeSoon(function() {
          info("Worker: starting tests");
          testGenerator.next();
        });
        break;

      case "clearAllDatabasesDone":
        info("Worker: all databases are cleared");
        if (self._clearAllDatabasesCallback) {
          self._clearAllDatabasesCallback();
        }
        break;

      default:
        throw new Error("Received a bad message from parent: " +
                        JSON.stringify(message));
    }
  };

  self.postMessage({ op: "ready" });
}

// SimpleDB connections and SpecialPowers wrapping:
//
// SpecialPowers provides a SpecialPowersHandler Proxy mechanism that lets our
// content-privileged code borrow its chrome-privileged principal to access
// things we shouldn't be able to access.  The proxies wrap their returned
// values, so once we have something wrapped we can rely on returned objects
// being wrapped as well.  The proxy will also automatically unwrap wrapped
// arguments we pass in.  However, we need to invoke wrapCallback on callback
// functions so that the arguments they receive will be wrapped because the
// proxy does not automatically wrap content-privileged functions.
//
// Our use of (wrapped) SpecialPowers.Cc results in getSimpleDatabase()
// producing a wrapped nsISDBConnection instance.  The nsISDBResult instances
// exposed on the (wrapped) nsISDBRequest are also wrapped, so our
// requestFinished helper wraps the results in helper objects that behave the
// same as the result, automatically unwrapping the wrapped array/arraybuffer
// results.

function getSimpleDatabase()
{
  let connection = SpecialPowers.Cc["@mozilla.org/dom/sdb-connection;1"]
    .createInstance(SpecialPowers.Ci.nsISDBConnection);

  let principal = SpecialPowers.wrap(document).nodePrincipal;

  connection.init(principal);

  return connection;
}

function* requestFinished(request) {
  request.callback = SpecialPowers.wrapCallback(continueToNextStepSync);
  yield undefined;
  if (request.resultCode == SpecialPowers.Cr.NS_OK) {
    let result = request.result;
    if (SpecialPowers.call_Instanceof(result, SpecialPowers.Ci.nsISDBResult)) {
      let wrapper = {};
      for (let i in result) {
        if (typeof result[i] == "function") {
          wrapper[i] = SpecialPowers.unwrap(result[i]);
        } else {
          wrapper[i] = result[i];
        }
      }
      return wrapper;
    }
    return result;
  }
  throw request.resultCode;
}