(function(angular, $, _) {
  // Declare a list of dependencies.
  angular.module("crmContactcats", CRM.angRequires("crmContactcats"));
  angular.module("crmContactcats").component("crmContactCategorySettings", {
    templateUrl: "~/crmContactcats/crmContactCategorySettings.html",
    bindings: {
      // things listed here become properties on the controller using
      // values from attributes. @ means a fixed string is passed
      // e.g. <crm-reset-password token='foo' />
      // token: '@',
      // & is special. In the child, call ctrl.onMyAction with an
      // Object whose keys provide parameter names for the code in the parent.
      // onMyAction: '&',
      // '<' means one-way binding (parent»child) and I think is what you are
      // supposed to use for components.
      // v: '<'
    },
    controller: function($scope, $timeout, crmApi4, crmStatus, $document) {
      var ts = ($scope.ts = CRM.ts(null)),
        ctrl = this;

      // this.$onInit gets run after the this controller is called, and after the bindings have been applied.
      this.$onInit = async function() {
        ctrl.dirty = 'pristine'; //pristine|dirty
        ctrl.view = 'list';
        ctrl.moveIdx = null;
        ctrl.categoryToEdit = null;
        ctrl.categoryDefinitions = null;
        ctrl.categoryDefinitions = await crmApi4("ContactCategoryDefinition", 'get', { orderBy: { label: 'ASC' }, withLabels: true });
        updateOrders();
        console.log("Got", ctrl.categoryDefinitions);

        $scope.$digest();

        /**
         * Presentation order is by label. Promoting "0123 label" type labels.
         *
         * We set execution_order to the array index to keep things simpler.
         */
        function updateOrders() {

          // re-set execution_order.
          ctrl.categoryDefinitions.forEach((item, idx) => {
            item.execution_order = idx;
          });

          const po = ctrl.categoryDefinitions.slice();
          po.sort((a, b) => {
            if (a.label < b.label) return -1;
            if (a.label > b.label) return 1;
            return (a.execution_order ?? 1) - (b.execution_order ?? 1);
          });
          ctrl.presentationOrder = po;
        }

        ctrl.edit = idx => {
          if (idx === -1) {
            // New item.

            // Create a random dark colour
            let [r, g, b] = [Math.random(), Math.random(), Math.random()],
              min = Math.min(r, g, b),
              range = Math.max(r, g, b) - min,
              conv = (x) => ('0' + Math.ceil((x-min)/range * 128).toString(16)).replace(/^.*(..)$/, '$1');

            // Create a blank
            ctrl.categoryToEdit = {
              id: 0,
              execution_order: ctrl.categoryDefinitions.length,
              label: '',
              search_type: 'search',
              search_data: { saved_search_id: null },
              color: '#' + [r, g, b].map(conv).join(''),
              icon: '',
              description: '',
            };
          }
          else {
            ctrl.categoryToEdit = Object.assign({}, JSON.parse(JSON.stringify(ctrl.categoryDefinitions[idx])));
          }
          ctrl.view = 'edit';
        };

        ctrl.moveTo = idx => {
          let item = ctrl.categoryDefinitions.splice(ctrl.moveIdx, 1)[0];
          if (idx > ctrl.moveIdx) {
            idx--;
          }
          ctrl.categoryDefinitions.splice(idx, 0, item);
          ctrl.moveIdx = null;
          updateOrders();
          $ctrl.dirty = 'dirty';
        };

        ctrl.deleteCategory = idx => {
          if (!confirm(ts(
            'Confirm deleting category ‘%1’. You will lose history related to this category. Sure?',
            {1: ctrl.categoryDefinitions[idx].label}
          ))) {
            return;
          }
          ctrl.categoryDefinitions[idx].deleted = true;
          ctrl.categoryToEdit = null;
          updateOrders();
          ctrl.view = 'list';
          ctrl.dirty = 'dirty';
        };

        ctrl.updateEditedThing = () => {
          const edited = ctrl.categoryToEdit;
          // @todo validate, e.g.
          if (!edited.label) {
            alert("No name");
            return;
          }

          const search_data = edited.search_data;
          if (edited.search_type === 'group') {
            // Only store what we need.
            const {group_id} = search_data;
            edited.search_data = {group_id};
          }
          else if (edited.search_type === 'search') {
            const {saved_search_id} = search_data;
            edited.search_data = {saved_search_id};
          }

          const idx = edited.execution_order;
          ctrl.categoryDefinitions[idx] = edited;
          ctrl.categoryToEdit = null;
          updateOrders();
          ctrl.dirty = 'dirty';
          ctrl.view = 'list';
        }

        // We need to ensure the search_data object contains the fields required for the selected search_type
        ctrl.fixSearchData = () => {
          const search_data = ctrl.categoryToEdit.search_data;
          if (ctrl.categoryToEdit.search_type === 'group') {
            if (!('group_id' in search_data)) {
              search_data.group_id = null;
            }
          }
          else if (ctrl.categoryToEdit.search_type === 'search') {
            if (!('saved_search_id' in search_data)) {
              search_data.saved_search_id = null;
            }
          }
        };

        ctrl.save = () => {
          if (!confirm(ts("Confirm saving changes to categories? Note that categories will not be fully applied until tomorrow."))) { return; }

          
          // Handle deletions first.
          const deletedIds = ctrl.categoryDefinitions.filter(d => d.deleted && d.id > 0).map(d => d.id);

          const chain = Promise.resolve();
          if (deletedIds.length) {
            chain.then(() => crmApi4('ContactCategoryDefinition', 'delete', { where: [ ['id', 'IN', deletedIds] ] }));
          }
          // Now enact the deletions on our local model.
          ctrl.categoryDefinitions = ctrl.categoryDefinitions.filter(d => !d.deleted);
          // Tidy execution_order
          updateOrders();
          if (ctrl.categoryDefinitions.length) {
            chain.then(() => crmApi4('ContactCategoryDefinition', 'save', {records:ctrl.categoryDefinitions}));
          }
          chain.then(() => {
            ctrl.dirty = 'pristine';
          })
          crmStatus({ start: ts('Saving...'), success: ts('Saved')}, chain);
        };
      };
      // this.$onChange = function(changes) {
      //   // changes is object keyed by name what '<' binding changed in
      //   // the parent (e.g. 'v'), and value is another obj with keys
      //   // something like previous, new, ...?...
      // };
    }
  });
})(angular, CRM.$, CRM._);