///<reference path="../../headers/common.d.ts" />

import angular from 'angular';
import $ from 'jquery';
import _ from 'lodash';
import Drop from 'tether-drop';

var module = angular.module('grafana.directives');

var panelTemplate = `
  <div class="panel-container">
    <div class="panel-header">
      <span class="panel-info-corner">
        <i class="fa"></i>
        <span class="panel-info-corner-inner"></span>
      </span>

      <span class="panel-loading" ng-show="ctrl.loading">
        <i class="fa fa-spinner fa-spin"></i>
      </span>

      <div class="panel-title-container drag-handle" panel-menu></div>
    </div>

    <div class="panel-content">
      <ng-transclude></ng-transclude>
    </div>
    <panel-resizer></panel-resizer>
  </div>

  <div class="panel-full-edit" ng-if="ctrl.editMode">
    <div class="tabbed-view tabbed-view--panel-edit">
      <div class="tabbed-view-header">
        <h2 class="tabbed-view-title">
          {{ctrl.pluginName}}
        </h2>

        <ul class="gf-tabs">
          <li class="gf-tabs-item" ng-repeat="tab in ::ctrl.editorTabs">
            <a class="gf-tabs-link" ng-click="ctrl.changeTab($index)" ng-class="{active: ctrl.editorTabIndex === $index}">
              {{::tab.title}}
            </a>
          </li>
        </ul>

        <button class="tabbed-view-close-btn" ng-click="ctrl.exitFullscreen();">
          <i class="fa fa-remove"></i>
        </button>
      </div>

      <div class="tabbed-view-body">
        <div ng-repeat="tab in ctrl.editorTabs" ng-if="ctrl.editorTabIndex === $index">
          <panel-editor-tab editor-tab="tab" ctrl="ctrl" index="$index"></panel-editor-tab>
        </div>
      </div>
    </div>
  </div>
`;

module.directive('grafanaPanel', function($rootScope, $document) {
  return {
    restrict: 'E',
    template: panelTemplate,
    transclude: true,
    scope: { ctrl: "=" },
    link: function(scope, elem) {
      var panelContainer = elem.find('.panel-container');
      var cornerInfoElem = elem.find('.panel-info-corner');
      var ctrl = scope.ctrl;
      var infoDrop;

      // the reason for handling these classes this way is for performance
      // limit the watchers on panels etc
      var transparentLastState = false;
      var lastHasAlertRule = false;
      var lastAlertState;
      var hasAlertRule;
      var lastHeight = 0;

      function mouseEnter() {
        panelContainer.toggleClass('panel-hover-highlight', true);
        ctrl.dashboard.setPanelFocus(ctrl.panel.id);
      }

      function mouseLeave() {
        panelContainer.toggleClass('panel-hover-highlight', false);
        ctrl.dashboard.setPanelFocus(0);
      }

      // set initial height
      if (!ctrl.containerHeight) {
        ctrl.calculatePanelHeight();
        panelContainer.css({minHeight: ctrl.containerHeight});
        lastHeight = ctrl.containerHeight;
      }

      // set initial transparency
      if (ctrl.panel.transparent) {
        transparentLastState = true;
        panelContainer.addClass('panel-transparent', true);
      }

      ctrl.events.on('render', () => {
        if (lastHeight !== ctrl.containerHeight) {
          panelContainer.css({minHeight: ctrl.containerHeight});
          lastHeight = ctrl.containerHeight;
        }

        if (transparentLastState !== ctrl.panel.transparent) {
          panelContainer.toggleClass('panel-transparent', ctrl.panel.transparent === true);
          transparentLastState = ctrl.panel.transparent;
        }

        hasAlertRule = ctrl.panel.alert !== undefined;
        if (lastHasAlertRule !== hasAlertRule) {
          panelContainer.toggleClass('panel-has-alert', hasAlertRule);

          lastHasAlertRule = hasAlertRule;
        }

        if (ctrl.alertState) {
          if (lastAlertState) {
            panelContainer.removeClass('panel-alert-state--' + lastAlertState);
          }

          if (ctrl.alertState.state === 'ok' || ctrl.alertState.state === 'alerting') {
            panelContainer.addClass('panel-alert-state--' + ctrl.alertState.state);
          }

          lastAlertState = ctrl.alertState.state;
        } else if (lastAlertState) {
          panelContainer.removeClass('panel-alert-state--' + lastAlertState);
          lastAlertState = null;
        }
      });

      var lastFullscreen;
      $rootScope.onAppEvent('panel-change-view', function(evt, payload) {
        if (lastFullscreen !== ctrl.fullscreen) {
          elem.toggleClass('panel-fullscreen', ctrl.fullscreen ? true : false);
          lastFullscreen = ctrl.fullscreen;
        }
      }, scope);

      function updatePanelCornerInfo() {
        var cornerMode = ctrl.getInfoMode();
        cornerInfoElem[0].className = 'panel-info-corner panel-info-corner--' + cornerMode;

        if (cornerMode) {
          if (infoDrop) {
            infoDrop.destroy();
          }

          infoDrop = new Drop({
            target: cornerInfoElem[0],
            content: function() {
              return ctrl.getInfoContent({mode: 'tooltip'});
            },
            classes: ctrl.error ? 'drop-error' : 'drop-help',
            openOn: 'hover',
            hoverOpenDelay: 100,
            tetherOptions: {
              attachment: 'bottom left',
              targetAttachment: 'top left',
              constraints: [
                {
                  to: 'window',
                  attachment: 'together',
                  pin: true
                }
              ],
            }
          });
        }
      }

      scope.$watchGroup(['ctrl.error', 'ctrl.panel.description'], updatePanelCornerInfo);
      scope.$watchCollection('ctrl.panel.links', updatePanelCornerInfo);

      cornerInfoElem.on('click', function() {
        infoDrop.close();
        scope.$apply(ctrl.openInspector.bind(ctrl));
      });

      elem.on('mouseenter', mouseEnter);
      elem.on('mouseleave', mouseLeave);

      ctrl.isPanelVisible = function () {
        var position = panelContainer[0].getBoundingClientRect();
        return (0 < position.top) && (position.top < window.innerHeight);
      };

      const refreshOnScroll = function () {
        if (ctrl.skippedLastRefresh) {
          ctrl.refresh();
        }
      };

      $document.on('scroll', refreshOnScroll);

      scope.$on('$destroy', function() {
        elem.off();
        cornerInfoElem.off();
        $document.off('scroll', refreshOnScroll);

        if (infoDrop) {
          infoDrop.destroy();
        }
      });
    }
  };
});

module.directive('panelResizer', function($rootScope) {
  return {
    restrict: 'E',
    template: '<span class="resize-panel-handle icon-gf icon-gf-grabber"></span>',
    link: function(scope, elem) {
      var resizing = false;
      var lastPanel;
      var ctrl = scope.ctrl;
      var handleOffset;
      var originalHeight;
      var originalWidth;
      var maxWidth;

      function dragStartHandler(e) {
        e.preventDefault();
        resizing = true;

        handleOffset = $(e.target).offset();
        originalHeight = parseInt(ctrl.row.height);
        originalWidth = ctrl.panel.span;
        maxWidth = $(document).width();

        lastPanel = ctrl.row.panels[ctrl.row.panels.length - 1];

        $('body').on('mousemove', moveHandler);
        $('body').on('mouseup', dragEndHandler);
      }

      function moveHandler(e) {
        ctrl.row.height = Math.round(originalHeight + (e.pageY - handleOffset.top));
        ctrl.panel.span = originalWidth + (((e.pageX - handleOffset.left) / maxWidth) * 12);
        ctrl.panel.span = Math.min(Math.max(ctrl.panel.span, 1), 12);

        ctrl.row.updateRowSpan();
        var rowSpan = ctrl.row.span;

        // auto adjust other panels
        if (Math.floor(rowSpan) < 14) {
          // last panel should not push row down
          if (lastPanel === ctrl.panel && rowSpan > 12) {
            lastPanel.span -= rowSpan - 12;
          } else if (lastPanel !== ctrl.panel) {
            // reduce width of last panel so total in row is 12
            lastPanel.span = lastPanel.span - (rowSpan - 12);
            lastPanel.span = Math.min(Math.max(lastPanel.span, 1), 12);
          }
        }

        ctrl.row.panelSpanChanged(true);

        scope.$apply(function() {
          ctrl.render();
        });
      }

      function dragEndHandler() {
        ctrl.panel.span = Math.round(ctrl.panel.span);
        if (lastPanel) {
          lastPanel.span = Math.round(lastPanel.span);
        }

        // first digest to propagate panel width change
        // then render
        $rootScope.$apply(function() {
          ctrl.row.panelSpanChanged();
          setTimeout(function() {
            $rootScope.$broadcast('render');
          });
        });

        $('body').off('mousemove', moveHandler);
        $('body').off('mouseup', dragEndHandler);
      }

      elem.on('mousedown', dragStartHandler);

      var unbind = scope.$on("$destroy", function() {
        elem.off('mousedown', dragStartHandler);
        unbind();
      });
    }
  };
});

module.directive('panelHelpCorner', function($rootScope) {
  return {
    restrict: 'E',
    template: `
      <span class="alert-error panel-error small pointer" ng-if="ctrl.error" ng-click="ctrl.openInspector()">
        <span data-placement="top" bs-tooltip="ctrl.error">
          <i class="fa fa-exclamation"></i><span class="panel-error-arrow"></span>
        </span>
      </span>
    `,
    link: function(scope, elem) {
    }
  };
});