import { ClosureComponent, Component } from "mithril";
import { m } from "./components.ts";
import config from "./config.ts";
import * as store from "./store.ts";
import pieChartComponent from "./pie-chart-component.ts";

const GROUPS = config.ui.overview.groups || {};
const CHARTS = {};
for (const group of Object.values(GROUPS)) {
  for (const chartName of Object.values(group["charts"]) as string[])
    CHARTS[chartName] = config.ui.overview.charts[chartName];
}

function queryCharts(charts: Record<string, unknown>): Record<string, unknown> {
  charts = Object.assign({}, charts);
  for (let [chartName, chart] of Object.entries(charts)) {
    charts[chartName] = chart = Object.assign({}, chart);
    chart["slices"] = Object.assign({}, chart["slices"]);
    for (let [sliceName, slice] of Object.entries(chart["slices"])) {
      const filter = slice["filter"];
      chart["slices"][sliceName] = slice = Object.assign({}, slice);
      slice["count"] = store.count("devices", filter);
    }
  }
  return charts;
}

export function init(): Promise<Record<string, unknown>> {
  if (!window.authorizer.hasAccess("devices", 1)) {
    return Promise.reject(
      new Error("You are not authorized to view this page"),
    );
  }

  return Promise.resolve({ charts: queryCharts(CHARTS) });
}

export const component: ClosureComponent = (): Component => {
  return {
    view: (vnode) => {
      document.title = "Overview - GenieACS";
      const children = [];
      for (const group of Object.values(GROUPS)) {
        if (group["label"])
          children.push(
            m("h1", store.evaluateExpression(group["label"], null)),
          );

        const groupChildren = [];
        for (const chartName of Object.values(group["charts"]) as string[]) {
          const chart = vnode.attrs["charts"][chartName];
          const chartChildren = [];
          if (chart.label)
            chartChildren.push(
              m("h2", store.evaluateExpression(chart.label, null)),
            );

          const attrs = {};
          attrs["chart"] = chart;
          chartChildren.push(m(pieChartComponent, attrs));

          groupChildren.push(m(".overview-chart", chartChildren));
        }

        children.push(m(".overview-chart-group", groupChildren));
      }

      return children;
    },
  };
};