import { useQuery } from "@tanstack/react-query";
import { useNavigate } from "react-router-dom";
import {
  Loader2,
  AlertCircle,
  TrendingUp,
  TrendingDown,
  Minus,
  ArrowRight,
} from "lucide-react";
import {
  LineChart,
  Line,
  BarChart,
  Bar,
  XAxis,
  YAxis,
  CartesianGrid,
  Tooltip,
  ResponsiveContainer,
  Cell,
} from "recharts";
import { getOrganizationScore, getScoreHistory } from "../api/scores";
import {
  getOperationalMetrics,
  getMetricsByTeam,
} from "../api/operational-metrics";
import { getCoverageByTactic } from "../api/metrics";
import { getThreatActors } from "../api/threat-actors";
import { getTechniques, type TechniqueSummary } from "../api/techniques";

// ── Score Gauge Component ────────────────────────────────────────────

function ScoreGauge({ score, label }: { score: number; label: string }) {
  const getColor = (s: number) => {
    if (s < 30) return "#ef4444";
    if (s < 50) return "#f97316";
    if (s < 70) return "#eab308";
    return "#22c55e";
  };

  const color = getColor(score);
  const circumference = 2 * Math.PI * 54;
  const strokeDasharray = `${(score / 100) * circumference} ${circumference}`;

  return (
    <div className="flex flex-col items-center">
      <div className="relative h-32 w-32">
        <svg className="h-32 w-32 -rotate-90" viewBox="0 0 120 120">
          <circle
            cx="60"
            cy="60"
            r="54"
            fill="none"
            stroke="#1f2937"
            strokeWidth="8"
          />
          <circle
            cx="60"
            cy="60"
            r="54"
            fill="none"
            stroke={color}
            strokeWidth="8"
            strokeLinecap="round"
            strokeDasharray={strokeDasharray}
            className="transition-all duration-1000"
          />
        </svg>
        <div className="absolute inset-0 flex flex-col items-center justify-center">
          <span className="text-3xl font-bold text-white">{Math.round(score)}</span>
          <span className="text-[10px] text-gray-500">/ 100</span>
        </div>
      </div>
      <span className="mt-2 text-xs font-medium text-gray-400">{label}</span>
    </div>
  );
}

// ── KPI Card Component ──────────────────────────────────────────────

function KPICard({
  label,
  value,
  unit,
  trend,
}: {
  label: string;
  value: string | number;
  unit?: string;
  trend?: "improving" | "declining" | "stable" | null;
}) {
  const TrendIcon =
    trend === "improving"
      ? TrendingUp
      : trend === "declining"
      ? TrendingDown
      : Minus;

  const trendColor =
    trend === "improving"
      ? "text-green-400"
      : trend === "declining"
      ? "text-red-400"
      : "text-gray-500";

  return (
    <div className="rounded-xl border border-gray-800 bg-gray-900 p-4">
      <p className="text-xs text-gray-500 uppercase tracking-wider">{label}</p>
      <div className="mt-2 flex items-end justify-between">
        <div>
          <span className="text-2xl font-bold text-white">
            {value === null || value === undefined ? "N/A" : value}
          </span>
          {unit && <span className="ml-1 text-sm text-gray-500">{unit}</span>}
        </div>
        {trend && (
          <TrendIcon className={`h-5 w-5 ${trendColor}`} />
        )}
      </div>
    </div>
  );
}

// ── Main Component ──────────────────────────────────────────────────

export default function ExecutiveDashboardPage() {
  const navigate = useNavigate();

  const { data: orgScore, isLoading: loadingScore } = useQuery({
    queryKey: ["org-score"],
    queryFn: getOrganizationScore,
  });

  const { data: scoreHistory } = useQuery({
    queryKey: ["score-history", "90d"],
    queryFn: () => getScoreHistory("90d"),
  });

  const { data: opMetrics, isLoading: loadingMetrics } = useQuery({
    queryKey: ["operational-metrics"],
    queryFn: getOperationalMetrics,
  });

  const { data: teamMetrics } = useQuery({
    queryKey: ["team-metrics"],
    queryFn: getMetricsByTeam,
  });

  const { data: tacticCoverage } = useQuery({
    queryKey: ["tactic-coverage"],
    queryFn: getCoverageByTactic,
  });

  const { data: threatActors } = useQuery({
    queryKey: ["threat-actors-top"],
    queryFn: () => getThreatActors({ limit: 5 }),
  });

  const { data: allTechniques } = useQuery({
    queryKey: ["techniques-exec"],
    queryFn: () => getTechniques(),
  });

  const isLoading = loadingScore || loadingMetrics;

  if (isLoading) {
    return (
      <div className="flex h-64 items-center justify-center">
        <Loader2 className="h-8 w-8 animate-spin text-cyan-400" />
      </div>
    );
  }

  // Critical gaps: not_covered or not_evaluated techniques
  const criticalGaps: TechniqueSummary[] = (allTechniques || [])
    .filter((t) => t.status_global === "not_covered" || t.status_global === "not_evaluated")
    .slice(0, 10);

  // Coverage by tactic for bar chart
  const tacticData = (tacticCoverage || []).map((tc) => ({
    name: tc.tactic
      .split("-")
      .map((w: string) => w.charAt(0).toUpperCase() + w.slice(1))
      .join(" "),
    coverage: tc.total > 0 ? Math.round(((tc.validated + tc.partial) / tc.total) * 100) : 0,
  }));

  const getBarColor = (coverage: number) => {
    if (coverage < 30) return "#ef4444";
    if (coverage < 50) return "#f97316";
    if (coverage < 70) return "#eab308";
    return "#22c55e";
  };

  return (
    <div className="space-y-6">
      {/* Header */}
      <div>
        <h1 className="text-2xl font-bold text-white">Executive Dashboard</h1>
        <p className="mt-1 text-sm text-gray-400">
          Organization security posture overview
        </p>
      </div>

      {/* Section 1: Score Card + Sub-scores */}
      <div className="grid grid-cols-1 gap-6 lg:grid-cols-4">
        <div className="rounded-xl border border-gray-800 bg-gray-900 p-6 lg:col-span-1 flex flex-col items-center justify-center">
          <ScoreGauge
            score={orgScore?.overall_score ?? 0}
            label="Overall Score"
          />
          <div className="mt-4 grid w-full grid-cols-2 gap-2">
            <div className="rounded-lg bg-gray-800 px-3 py-2 text-center">
              <p className="text-lg font-bold text-white">
                {orgScore?.total_coverage ?? 0}
              </p>
              <p className="text-[10px] text-gray-500">Coverage</p>
            </div>
            <div className="rounded-lg bg-gray-800 px-3 py-2 text-center">
              <p className="text-lg font-bold text-white">
                {orgScore?.detection_maturity ?? 0}
              </p>
              <p className="text-[10px] text-gray-500">Detection</p>
            </div>
            <div className="rounded-lg bg-gray-800 px-3 py-2 text-center">
              <p className="text-lg font-bold text-white">
                {orgScore?.critical_coverage ?? 0}
              </p>
              <p className="text-[10px] text-gray-500">Critical</p>
            </div>
            <div className="rounded-lg bg-gray-800 px-3 py-2 text-center">
              <p className="text-lg font-bold text-white">
                {orgScore?.response_readiness ?? 0}
              </p>
              <p className="text-[10px] text-gray-500">Response</p>
            </div>
          </div>
        </div>

        {/* Section 2: Trend Chart */}
        <div className="rounded-xl border border-gray-800 bg-gray-900 p-4 lg:col-span-3">
          <h2 className="mb-3 text-sm font-semibold text-gray-300">
            Score Trend (90 days)
          </h2>
          <ResponsiveContainer width="100%" height={220}>
            <LineChart data={scoreHistory || []}>
              <CartesianGrid strokeDasharray="3 3" stroke="#1f2937" />
              <XAxis
                dataKey="date"
                tick={{ fill: "#6b7280", fontSize: 10 }}
                tickFormatter={(val) => {
                  const d = new Date(val);
                  return `${d.getMonth() + 1}/${d.getDate()}`;
                }}
              />
              <YAxis
                domain={[0, 100]}
                tick={{ fill: "#6b7280", fontSize: 10 }}
              />
              <Tooltip
                contentStyle={{
                  backgroundColor: "#111827",
                  border: "1px solid #374151",
                  borderRadius: "8px",
                  fontSize: "12px",
                }}
                labelStyle={{ color: "#9ca3af" }}
              />
              <Line
                type="monotone"
                dataKey="score"
                stroke="#06b6d4"
                strokeWidth={2}
                dot={false}
                name="Score"
              />
            </LineChart>
          </ResponsiveContainer>
        </div>
      </div>

      {/* Section 3: Top Threat Actors */}
      <div className="rounded-xl border border-gray-800 bg-gray-900 p-4">
        <h2 className="mb-3 text-sm font-semibold text-gray-300">
          Top Threat Actors
        </h2>
        <div className="space-y-2">
          {(threatActors?.items || []).map((actor) => (
            <div
              key={actor.id}
              className="flex items-center gap-3 rounded-lg bg-gray-800/50 p-3 cursor-pointer hover:bg-gray-800"
              onClick={() => navigate(`/threat-actors/${actor.id}`)}
            >
              <div className="flex h-8 w-8 items-center justify-center rounded-full bg-gray-700 text-xs font-bold text-gray-300">
                {actor.country?.slice(0, 2).toUpperCase() || "??"}
              </div>
              <div className="flex-1 min-w-0">
                <p className="text-sm font-medium text-white truncate">
                  {actor.name}
                </p>
                <p className="text-[10px] text-gray-500 truncate">
                  {actor.target_sectors?.slice(0, 3).join(", ")}
                </p>
              </div>
              <div className="flex items-center gap-2">
                <div className="w-24 h-2 rounded-full bg-gray-700 overflow-hidden">
                  <div
                    className="h-full rounded-full transition-all"
                    style={{
                      width: `${actor.coverage_pct}%`,
                      backgroundColor:
                        actor.coverage_pct > 70
                          ? "#22c55e"
                          : actor.coverage_pct > 40
                          ? "#eab308"
                          : "#ef4444",
                    }}
                  />
                </div>
                <span className="w-10 text-right text-xs font-medium text-gray-300">
                  {actor.coverage_pct}%
                </span>
              </div>
            </div>
          ))}
        </div>
      </div>

      {/* Section 4: Operational KPIs */}
      <div className="grid grid-cols-2 gap-4 lg:grid-cols-4">
        <KPICard
          label="MTTD"
          value={opMetrics?.mttd?.mean_hours ?? "N/A"}
          unit={opMetrics?.mttd ? "hrs" : undefined}
        />
        <KPICard
          label="MTTR"
          value={opMetrics?.mttr?.mean_hours ?? "N/A"}
          unit={opMetrics?.mttr ? "hrs" : undefined}
        />
        <KPICard
          label="Detection Efficacy"
          value={opMetrics?.detection_efficacy?.percentage ?? 0}
          unit="%"
        />
        <KPICard
          label="Validation Throughput"
          value={opMetrics?.validation_throughput?.tests_per_week ?? 0}
          unit="/week"
          trend={opMetrics?.validation_throughput?.trend}
        />
      </div>

      {/* Section 5: Coverage by Tactic */}
      <div className="rounded-xl border border-gray-800 bg-gray-900 p-4">
        <h2 className="mb-3 text-sm font-semibold text-gray-300">
          Coverage by Tactic
        </h2>
        <ResponsiveContainer width="100%" height={300}>
          <BarChart
            data={tacticData}
            layout="vertical"
            margin={{ left: 120 }}
          >
            <CartesianGrid strokeDasharray="3 3" stroke="#1f2937" />
            <XAxis
              type="number"
              domain={[0, 100]}
              tick={{ fill: "#6b7280", fontSize: 10 }}
              tickFormatter={(v) => `${v}%`}
            />
            <YAxis
              type="category"
              dataKey="name"
              width={120}
              tick={{ fill: "#9ca3af", fontSize: 10 }}
            />
            <Tooltip
              contentStyle={{
                backgroundColor: "#111827",
                border: "1px solid #374151",
                borderRadius: "8px",
                fontSize: "12px",
              }}
              formatter={(value: number) => [`${value}%`, "Coverage"]}
            />
            <Bar dataKey="coverage" radius={[0, 4, 4, 0]}>
              {tacticData.map((entry, index) => (
                <Cell
                  key={`cell-${index}`}
                  fill={getBarColor(entry.coverage)}
                />
              ))}
            </Bar>
          </BarChart>
        </ResponsiveContainer>
      </div>

      {/* Section 6: Critical Gaps */}
      <div className="rounded-xl border border-gray-800 bg-gray-900 p-4">
        <h2 className="mb-3 text-sm font-semibold text-gray-300">
          Critical Gaps (Top 10 Uncovered Techniques)
        </h2>
        <div className="overflow-x-auto">
          <table className="w-full text-sm">
            <thead>
              <tr className="border-b border-gray-800 text-left text-xs text-gray-500">
                <th className="pb-2 pr-4">MITRE ID</th>
                <th className="pb-2 pr-4">Name</th>
                <th className="pb-2 pr-4">Tactic</th>
                <th className="pb-2 pr-4">Status</th>
              </tr>
            </thead>
            <tbody>
              {criticalGaps.map((tech) => (
                <tr
                  key={tech.mitre_id}
                  className="border-b border-gray-800/50 cursor-pointer hover:bg-gray-800/30"
                  onClick={() => navigate(`/techniques/${tech.mitre_id}`)}
                >
                  <td className="py-2 pr-4 font-mono text-xs text-cyan-400">
                    {tech.mitre_id}
                  </td>
                  <td className="py-2 pr-4 text-gray-300 truncate max-w-[200px]">
                    {tech.name}
                  </td>
                  <td className="py-2 pr-4 text-gray-500 text-xs">
                    {tech.tactic
                      ?.split(",")[0]
                      .trim()
                      .split("-")
                      .map((w: string) => w.charAt(0).toUpperCase() + w.slice(1))
                      .join(" ")}
                  </td>
                  <td className="py-2 pr-4">
                    <span
                      className={`inline-block rounded-full px-2 py-0.5 text-[10px] font-medium ${
                        tech.status_global === "not_covered"
                          ? "bg-red-500/10 text-red-400"
                          : "bg-gray-500/10 text-gray-400"
                      }`}
                    >
                      {tech.status_global?.replace(/_/g, " ")}
                    </span>
                  </td>
                </tr>
              ))}
              {criticalGaps.length === 0 && (
                <tr>
                  <td colSpan={4} className="py-4 text-center text-gray-500">
                    No critical gaps found
                  </td>
                </tr>
              )}
            </tbody>
          </table>
        </div>
      </div>

      {/* Section 7: Team Performance */}
      {teamMetrics && (
        <div className="grid grid-cols-1 gap-4 lg:grid-cols-2">
          {/* Red Team */}
          <div className="rounded-xl border border-gray-800 bg-gray-900 p-4">
            <h2 className="mb-3 flex items-center gap-2 text-sm font-semibold text-red-400">
              <div className="h-2 w-2 rounded-full bg-red-500" />
              Red Team
            </h2>
            <div className="grid grid-cols-3 gap-3">
              <div className="rounded-lg bg-gray-800 px-3 py-2 text-center">
                <p className="text-lg font-bold text-white">
                  {teamMetrics.red_team.tests_completed}
                </p>
                <p className="text-[10px] text-gray-500">Tests Done</p>
              </div>
              <div className="rounded-lg bg-gray-800 px-3 py-2 text-center">
                <p className="text-lg font-bold text-white">
                  {teamMetrics.red_team.avg_completion_hours
                    ? `${teamMetrics.red_team.avg_completion_hours}h`
                    : "N/A"}
                </p>
                <p className="text-[10px] text-gray-500">Avg Time</p>
              </div>
              <div className="rounded-lg bg-gray-800 px-3 py-2 text-center">
                <p className="text-lg font-bold text-white">
                  {teamMetrics.red_team.rejection_rate}%
                </p>
                <p className="text-[10px] text-gray-500">Rejection</p>
              </div>
            </div>
          </div>

          {/* Blue Team */}
          <div className="rounded-xl border border-gray-800 bg-gray-900 p-4">
            <h2 className="mb-3 flex items-center gap-2 text-sm font-semibold text-blue-400">
              <div className="h-2 w-2 rounded-full bg-blue-500" />
              Blue Team
            </h2>
            <div className="grid grid-cols-3 gap-3">
              <div className="rounded-lg bg-gray-800 px-3 py-2 text-center">
                <p className="text-lg font-bold text-white">
                  {teamMetrics.blue_team.tests_completed}
                </p>
                <p className="text-[10px] text-gray-500">Tests Done</p>
              </div>
              <div className="rounded-lg bg-gray-800 px-3 py-2 text-center">
                <p className="text-lg font-bold text-white">
                  {teamMetrics.blue_team.avg_completion_hours
                    ? `${teamMetrics.blue_team.avg_completion_hours}h`
                    : "N/A"}
                </p>
                <p className="text-[10px] text-gray-500">Avg Time</p>
              </div>
              <div className="rounded-lg bg-gray-800 px-3 py-2 text-center">
                <p className="text-lg font-bold text-white">
                  {teamMetrics.blue_team.rejection_rate}%
                </p>
                <p className="text-[10px] text-gray-500">Rejection</p>
              </div>
            </div>
          </div>
        </div>
      )}
    </div>
  );
}