import * as React from 'react';
import {
  Activity,
  BarChart3,
  Clock,
  HelpCircle,
  MessageSquare,
  ThumbsDown,
  ThumbsUp,
  Wrench,
} from 'lucide-react';
import { Badge, EmptyState } from '@/components/ds';
import { readHistory } from '@/components/ai-assistant/history';
import { conversationStats, reviewRow } from '@/lib/agents/conversationInsights';
import { allSkills } from '@/lib/skills/registry';
import { usePreferences } from '@/lib/krowHooks';
import { cn } from '@/lib/utils';

/**
 * What this agent has actually been asked.
 *
 * Real-time usage analytics computed directly from the local telemetry log.
 */

function MetricCard({ icon: Icon, label, value, detail, highlight }: any) {
  return (
    <div className="rounded-2xl border border-border bg-surface p-5 shadow-xs space-y-2">
      <div className="flex items-center justify-between gap-2">
        <span className="text-caption font-medium text-ink-4 uppercase tracking-wider">{label}</span>
        <span className="flex h-7 w-7 items-center justify-center rounded-lg bg-surface-subtle text-ink-3">
          <Icon className="h-3.5 w-3.5" />
        </span>
      </div>
      <div className="flex items-baseline gap-2">
        <span className="font-heading text-title-xl font-bold tabular-nums text-ink-1 sm:text-3xl">
          {value}
        </span>
        {highlight && (
          <span className="text-caption font-semibold text-krow-blue">{highlight}</span>
        )}
      </div>
      {detail && <p className="text-caption text-ink-4">{detail}</p>}
    </div>
  );
}

export function AgentInsightsPanel({ agentId, agentName }: any) {
  const preferences = usePreferences();

  const [records] = React.useState(() => readHistory());

  const stats = React.useMemo(
    () => conversationStats(records, { agentId }),
    [records, agentId]
  );

  const skillName = React.useMemo(() => {
    const byId = new Map(allSkills(preferences.customSkills || []).map((s) => [s.id, s.name]));
    return (id) => byId.get(id) || id;
  }, [preferences.customSkills]);

  const conversations = React.useMemo(
    () => records
      .filter((r) => (agentId ? r.agentId === agentId : true))
      .slice(0, 8)
      .map(reviewRow),
    [records, agentId]
  );

  if (stats.empty) {
    return (
      <div className="w-full rounded-2xl border border-border bg-surface p-12 shadow-xs text-center">
        <EmptyState
          icon={MessageSquare}
          title="No conversations with this agent yet"
          description={`Insights are counted from conversations held on this device. Ask ${agentName || 'this agent'} something in Owliver and the figures appear here.`}
        />
      </div>
    );
  }

  return (
    <div className="w-full space-y-4">
      {/* ── KPI Metric Cards ───────────────────────────────────────────── */}
      <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-4">
        <MetricCard
          icon={MessageSquare}
          label="Total Conversations"
          value={stats.total}
          detail={`Active across ${stats.activeDays} day${stats.activeDays === 1 ? '' : 's'}`}
        />
        <MetricCard
          icon={HelpCircle}
          label="Questions Asked"
          value={stats.turns}
          detail={`${stats.averageTurns} per session average`}
        />
        <MetricCard
          icon={Activity}
          label="Surfaces Utilized"
          value={stats.pages}
          detail="Operational pages touched"
        />
        <MetricCard
          icon={ThumbsUp}
          label="Feedback Rating"
          value={stats.feedback.score === null ? '—' : `${stats.feedback.score}%`}
          detail={
            stats.feedback.score === null
              ? 'No ratings submitted'
              : `${stats.feedback.up} helpful · ${stats.feedback.down} unhelpful`
          }
        />
      </div>

      {/* ── 2-Column Ranking Breakdowns ────────────────────────────────── */}
      <div className="grid gap-4 md:grid-cols-2">
        {/* Most Used Skills */}
        <div className="rounded-2xl border border-border bg-surface p-5 shadow-xs space-y-3">
          <div className="flex items-center gap-2">
            <BarChart3 className="h-4 w-4 text-krow-blue" />
            <h4 className="font-heading text-body font-semibold text-ink-1">Most Triggered Skills</h4>
          </div>

          {stats.bySkill.length ? (
            <div className="space-y-2">
              {stats.bySkill.slice(0, 5).map((row) => (
                <div
                  key={row.id}
                  className="flex items-center justify-between gap-3 rounded-lg border border-border/60 bg-surface-subtle/30 px-3 py-2 text-body-sm"
                >
                  <span className="truncate font-medium text-ink-2">{skillName(row.id)}</span>
                  <Badge variant="neutral" size="sm" className="tabular-nums">
                    {row.count} query{row.count === 1 ? '' : 'ies'}
                  </Badge>
                </div>
              ))}
            </div>
          ) : (
            <div className="rounded-xl border border-border/80 bg-surface-subtle/50 p-4 text-body-sm text-ink-3">
              No skill executions logged yet. Conversations were handled directly by native page readers.
            </div>
          )}
        </div>

        {/* Actions Executed */}
        <div className="rounded-2xl border border-border bg-surface p-5 shadow-xs space-y-3">
          <div className="flex items-center gap-2">
            <Wrench className="h-4 w-4 text-krow-blue" />
            <h4 className="font-heading text-body font-semibold text-ink-1">Actions & Tool Usage</h4>
          </div>

          {stats.byTool.length ? (
            <div className="space-y-2">
              {stats.byTool.slice(0, 5).map((row) => (
                <div
                  key={row.id}
                  className="flex items-center justify-between gap-3 rounded-lg border border-border/60 bg-surface-subtle/30 px-3 py-2 text-body-sm"
                >
                  <span className="truncate font-medium text-ink-2">{row.id.replace(/_/g, ' ')}</span>
                  <Badge variant="neutral" size="sm" className="tabular-nums">
                    {row.count} run{row.count === 1 ? '' : 's'}
                  </Badge>
                </div>
              ))}
            </div>
          ) : (
            <div className="rounded-xl border border-border/80 bg-surface-subtle/50 p-4 text-body-sm text-ink-3">
              No action tool executions recorded in current audit window.
            </div>
          )}
        </div>
      </div>

      {/* ── Recent Conversations Table ─────────────────────────────────── */}
      <div className="rounded-2xl border border-border bg-surface shadow-xs overflow-hidden">
        <div className="border-b border-border/80 bg-surface-subtle/40 px-5 py-4 sm:px-6">
          <div className="flex items-center gap-2">
            <Clock className="h-4 w-4 text-krow-blue" />
            <h4 className="font-heading text-body font-semibold text-ink-1">
              Recent Conversation Logs
            </h4>
          </div>
        </div>

        <div className="divide-y divide-border/60">
          {conversations.map((row) => (
            <div
              key={row.id}
              className="flex flex-wrap items-center justify-between gap-3 px-5 py-3.5 sm:px-6 hover:bg-surface-subtle/30 transition-colors"
            >
              <div className="min-w-0 flex-1 space-y-0.5">
                <p className="truncate text-body-sm font-medium text-ink-1">
                  {row.title || 'General consultation'}
                </p>
                <p className="text-caption text-ink-4">
                  Surface:{' '}
                  <span className="font-medium text-ink-3">{row.page || 'Direct'}</span>
                </p>
              </div>

              <div className="flex items-center gap-3 shrink-0">
                <span className="text-caption tabular-nums text-ink-4">
                  {row.turns} turn{row.turns === 1 ? '' : 's'}
                </span>

                {row.feedback && (
                  <span
                    className={cn(
                      'inline-flex items-center gap-1 rounded-full px-2 py-0.5 text-[11px] font-semibold',
                      row.feedback.rating === 'up'
                        ? 'bg-emerald-50 text-emerald-700 border border-emerald-200 dark:bg-emerald-950/40 dark:text-emerald-300 dark:border-emerald-800'
                        : 'bg-amber-50 text-amber-700 border border-amber-200 dark:bg-amber-950/40 dark:text-amber-300 dark:border-amber-800'
                    )}
                  >
                    {row.feedback.rating === 'up' ? (
                      <>
                        <ThumbsUp className="h-2.5 w-2.5" /> Helpful
                      </>
                    ) : (
                      <>
                        <ThumbsDown className="h-2.5 w-2.5" /> Unhelpful
                      </>
                    )}
                  </span>
                )}
              </div>
            </div>
          ))}
        </div>
      </div>
    </div>
  );
}

export default AgentInsightsPanel;