"use strict";

ChromeUtils.defineModuleGetter(this, "TelemetryController",
                               "resource://gre/modules/TelemetryController.jsm");
ChromeUtils.defineModuleGetter(this, "TelemetryUtils",
                               "resource://gre/modules/TelemetryUtils.jsm");
ChromeUtils.defineModuleGetter(this, "Services",
                               "resource://gre/modules/Services.jsm");
ChromeUtils.defineModuleGetter(this, "ExtensionUtils",
                               "resource://gre/modules/ExtensionUtils.jsm");

const SCALAR_TYPES = {
  count: Ci.nsITelemetry.SCALAR_TYPE_COUNT,
  string: Ci.nsITelemetry.SCALAR_TYPE_STRING,
  boolean: Ci.nsITelemetry.SCALAR_TYPE_BOOLEAN,
};

// Currently unsupported on Android: blocked on 1220177.
// See 1280234 c67 for discussion.
function desktopCheck() {
  if (AppConstants.MOZ_BUILD_APP !== "browser") {
    throw new ExtensionUtils.ExtensionError("This API is only supported on desktop");
  }
}

this.telemetry = class extends ExtensionAPI {
  getAPI(context) {
    return {
      telemetry: {
        submitPing(type, payload, options) {
          desktopCheck();
          try {
            TelemetryController.submitExternalPing(type, payload, options);
          } catch (ex) {
            throw new ExtensionUtils.ExtensionError(ex);
          }
        },
        canUpload() {
          desktopCheck();
          // Note: remove the ternary and direct pref check when
          // TelemetryController.canUpload() is implemented (bug 1440089).
          try {
            const result = ("canUpload" in TelemetryController) ?
              TelemetryController.canUpload() :
              Services.prefs.getBoolPref(TelemetryUtils.Preferences.FhrUploadEnabled, false);
            return result;
          } catch (ex) {
            throw new ExtensionUtils.ExtensionError(ex);
          }
        },
        scalarAdd(name, value) {
          desktopCheck();
          try {
            Services.telemetry.scalarAdd(name, value);
          } catch (ex) {
            throw new ExtensionUtils.ExtensionError(ex);
          }
        },
        scalarSet(name, value) {
          desktopCheck();
          try {
            Services.telemetry.scalarSet(name, value);
          } catch (ex) {
            throw new ExtensionUtils.ExtensionError(ex);
          }
        },
        scalarSetMaximum(name, value) {
          desktopCheck();
          try {
            Services.telemetry.scalarSetMaximum(name, value);
          } catch (ex) {
            throw new ExtensionUtils.ExtensionError(ex);
          }
        },
        recordEvent(category, method, object, value, extra) {
          desktopCheck();
          try {
            Services.telemetry.recordEvent(category, method, object, value, extra);
          } catch (ex) {
            throw new ExtensionUtils.ExtensionError(ex);
          }
        },
        registerScalars(category, data) {
          desktopCheck();
          try {
            // For each scalar in `data`, replace scalar.kind with
            // the appropriate nsITelemetry constant.
            Object.keys(data).forEach(scalar => {
              data[scalar].kind = SCALAR_TYPES[data[scalar].kind];
            });
            Services.telemetry.registerScalars(category, data);
          } catch (ex) {
            throw new ExtensionUtils.ExtensionError(ex);
          }
        },
        setEventRecordingEnabled(category, enabled) {
          desktopCheck();
          try {
            Services.telemetry.setEventRecordingEnabled(category, enabled);
          } catch (ex) {
            throw new ExtensionUtils.ExtensionError(ex);
          }
        },
        registerEvents(category, data) {
          desktopCheck();
          try {
            Services.telemetry.registerEvents(category, data);
          } catch (ex) {
            throw new ExtensionUtils.ExtensionError(ex);
          }
        },
      },
    };
  }
};