/**
 * Dashboard page.
 *
 * Composes the fail2ban server status bar at the top, a shared time-range
 * selector, and the ban list showing aggregate bans from the fail2ban
 * database.  The time-range selection controls how far back to look.
 *
 * Sections are wrapped with SectionErrorBoundary to provide graceful
 * degradation if individual charts or tables fail to render.
 */

import { Text, makeStyles, tokens } from "@fluentui/react-components";
import { BanTable } from "../components/BanTable";
import { BanTrendChart } from "../components/BanTrendChart";
import { ChartStateWrapper } from "../components/ChartStateWrapper";
import { DashboardFilterBar } from "../components/DashboardFilterBar";
import { ServerStatusBar } from "../components/ServerStatusBar";
import { TopCountriesBarChart } from "../components/TopCountriesBarChart";
import { TopCountriesPieChart } from "../components/TopCountriesPieChart";
import { SectionErrorBoundary } from "../components/SectionErrorBoundary";
import { useCommonSectionStyles } from "../components/commonStyles";
import { useDashboardCountryData } from "../hooks/useDashboardCountryData";
import { DashboardFilterProvider, useDashboardFilters } from "./DashboardFilterProvider";


// ---------------------------------------------------------------------------
// Styles
// ---------------------------------------------------------------------------

const useStyles = makeStyles({
  root: {
    display: "flex",
    flexDirection: "column",
    gap: tokens.spacingVerticalM,
  },
  filterRow: {
    display: "flex",
    alignItems: "center",
    gap: tokens.spacingHorizontalM,
    flexWrap: "wrap",
  },
  sectionHeader: {
    display: "flex",
    alignItems: "center",
    justifyContent: "space-between",
    flexWrap: "wrap",
    gap: tokens.spacingHorizontalM,
    paddingBottom: tokens.spacingVerticalS,
    borderBottomWidth: "1px",
    borderBottomStyle: "solid",
    borderBottomColor: tokens.colorNeutralStroke2,
  },
  tabContent: {
    paddingTop: tokens.spacingVerticalS,
  },
  chartsRow: {
    display: "flex",
    flexDirection: "row",
    gap: tokens.spacingHorizontalL,
    flexWrap: "wrap",
  },
  chartCard: {
    flex: "1 1 300px",
    minWidth: "280px",
  },
});

// ---------------------------------------------------------------------------
// Component
// ---------------------------------------------------------------------------

/**
 * Main dashboard landing page.
 *
 * Displays the fail2ban server status, a time-range selector, and the
 * ban list table. Each section is protected with a SectionErrorBoundary
 * so that a failure in one section does not crash the entire page.
 */
function DashboardPageContent(): React.JSX.Element {
  const styles = useStyles();
  const { timeRange, originFilter, source, setTimeRange, setOriginFilter } = useDashboardFilters();

  const { countries, countryNames, loading: countryLoading, error: countryError, reload: reloadCountry } =
    useDashboardCountryData(timeRange, originFilter, source);

  const sectionStyles = useCommonSectionStyles();

  return (
    <div className={styles.root} data-testid="dashboard">
      {/* ------------------------------------------------------------------ */}
      {/* Server status bar                                                   */}
      {/* ------------------------------------------------------------------ */}
      <SectionErrorBoundary sectionName="Server Status">
        <ServerStatusBar />
      </SectionErrorBoundary>

      {/* ------------------------------------------------------------------ */}
      {/* Global filter bar                                                  */}
      {/* ------------------------------------------------------------------ */}
      <div className={styles.filterRow}>
        <DashboardFilterBar
          timeRange={timeRange}
          onTimeRangeChange={setTimeRange}
          originFilter={originFilter}
          onOriginFilterChange={setOriginFilter}
        />
      </div>

      {/* ------------------------------------------------------------------ */}
      {/* Ban Trend section                                                   */}
      {/* ------------------------------------------------------------------ */}
      <div className={sectionStyles.section}>
        <div className={styles.sectionHeader}>
          <Text as="h2" size={500} weight="semibold">
            Ban Trend
          </Text>
        </div>
        <div className={styles.tabContent}>
          <SectionErrorBoundary sectionName="Ban Trend Chart">
            <BanTrendChart
              timeRange={timeRange}
              origin={originFilter}
              source={source}
            />
          </SectionErrorBoundary>
        </div>
      </div>

      {/* ------------------------------------------------------------------ */}
      {/* Charts section                                                      */}
      {/* ------------------------------------------------------------------ */}
      <div className={sectionStyles.section}>
        <div className={styles.sectionHeader}>
          <Text as="h2" size={500} weight="semibold">
            Top Countries
          </Text>
        </div>
        <div className={styles.tabContent}>
          <SectionErrorBoundary sectionName="Country Charts">
            <ChartStateWrapper
              isLoading={countryLoading}
              error={countryError}
              onRetry={reloadCountry}
              isEmpty={!countryLoading && Object.keys(countries).length === 0}
              emptyMessage="No ban data for the selected period."
            >
              <div className={styles.chartsRow}>
                <div className={styles.chartCard}>
                  <TopCountriesPieChart
                    countries={countries}
                    countryNames={countryNames}
                  />
                </div>
                <div className={styles.chartCard}>
                  <TopCountriesBarChart
                    countries={countries}
                    countryNames={countryNames}
                  />
                </div>
              </div>
            </ChartStateWrapper>
          </SectionErrorBoundary>
        </div>
      </div>

      {/* ------------------------------------------------------------------ */}
      {/* Ban list section                                                    */}
      {/* ------------------------------------------------------------------ */}
      <div className={sectionStyles.section}>
        <div className={styles.sectionHeader}>
          <Text as="h2" size={500} weight="semibold">
            Ban List
          </Text>
        </div>

        {/* Ban table */}
        <div className={styles.tabContent}>
          <SectionErrorBoundary sectionName="Ban List">
            <BanTable
              timeRange={timeRange}
              origin={originFilter}
              source={source}
            />
          </SectionErrorBoundary>
        </div>
      </div>
    </div>
  );
}

export function DashboardPage(): React.JSX.Element {
  return (
    <DashboardFilterProvider>
      <DashboardPageContent />
    </DashboardFilterProvider>
  );
}