import { motion } from 'motion/react';
import { useParams, useNavigate } from 'react-router';
import { TrendingUp, ArrowUpRight, Download, Loader2, FileText, FileSpreadsheet, ChevronDown } from 'lucide-react';
import { SectionWrapper } from './ui/SectionWrapper';
import {
  DropdownMenu,
  DropdownMenuTrigger,
  DropdownMenuContent,
  DropdownMenuItem,
} from '@/shared/ui/dropdown-menu';
import { useExportPDF } from '@/features/report/hooks/useExportPDF';
import { useExportCSV } from '@/features/report/hooks/useExportCSV';
import type { KPIMetric, MarketingReport } from '@/features/report/types/report';

interface KPIDashboardProps {
  metrics: KPIMetric[];
  clinicName?: string;
  /** 전체 리포트 — CSV 내보내기에 사용 */
  report?: MarketingReport;
}

function isNegativeValue(value: string | number): boolean {
  const lower = String(value).toLowerCase();
  return lower === '0' || lower.includes('없음') || lower.includes('불가') || lower === 'n/a' || lower === '-' || lower.includes('측정 불가');
}

/** 가독성을 위해 큰 숫자 포맷팅: 150000 → 150K, 1500000 → 1.5M */
function formatKpiValue(value: string | number): string {
  const str = String(value ?? '');
  // 이미 포맷된 경우(K, M, %, ~, 월, 건 등 포함) 그대로 반환
  if (/[KkMm%~월건회개명/]/.test(str)) return str;
  // 순수 숫자로 파싱 시도
  const num = parseInt(str.replace(/,/g, ''), 10);
  if (isNaN(num)) return str;
  if (num >= 1_000_000) return `${(num / 1_000_000).toFixed(1)}M`;
  if (num >= 10_000) return `${Math.round(num / 1_000)}K`;
  if (num >= 1_000) return `${(num / 1_000).toFixed(1)}K`;
  return str;
}

export default function KPIDashboard({ metrics, clinicName, report }: KPIDashboardProps) {
  const { id } = useParams<{ id: string }>();
  const navigate = useNavigate();
  const { exportPDF, isExporting } = useExportPDF();
  const { exportReportCSV } = useExportCSV();
  const baseFilename = `INFINITH_Marketing_Report_${clinicName || 'Report'}`;

  return (
    <SectionWrapper id="kpi-dashboard" title="KPI Dashboard" subtitle="핵심 성과 지표 목표">
      {/* KPI Table */}
      <motion.div
        className="rounded-2xl overflow-hidden border border-slate-100 mb-10"
        initial={{ opacity: 0, y: 20 }}
        whileInView={{ opacity: 1, y: 0 }}
        viewport={{ once: true }}
        transition={{ duration: 0.5 }}
      >
        {/* Header */}
        <div className="grid grid-cols-4 bg-brand-navy text-white">
          <div className="px-6 py-4 text-sm font-semibold">Metric</div>
          <div className="px-6 py-4 text-sm font-semibold">Current</div>
          <div className="px-6 py-4 text-sm font-semibold">3-Month Target</div>
          <div className="px-6 py-4 text-sm font-semibold">12-Month Target</div>
        </div>

        {/* Data rows */}
        {metrics.map((metric, i) => (
          <motion.div
            key={metric.metric}
            className={`grid grid-cols-4 items-center ${i % 2 === 0 ? 'bg-white' : 'bg-slate-50/60'} border-b border-slate-100 last:border-b-0`}
            initial={{ opacity: 0, y: 10 }}
            whileInView={{ opacity: 1, y: 0 }}
            viewport={{ once: true }}
            transition={{ duration: 0.3, delay: i * 0.03 }}
          >
            <div className="px-6 py-4 text-sm font-medium text-brand-navy">{metric.metric}</div>
            <div
              className={`px-6 py-4 text-sm font-semibold ${
                isNegativeValue(metric.current) ? 'text-brand-rose' : 'text-brand-navy'
              }`}
            >
              {formatKpiValue(metric.current)}
            </div>
            <div className="px-6 py-4 text-sm font-medium text-brand-purple-muted">{formatKpiValue(metric.target3Month)}</div>
            <div className="px-6 py-4 text-sm font-medium text-brand-purple-muted">{formatKpiValue(metric.target12Month)}</div>
          </motion.div>
        ))}
      </motion.div>

      {/* CTA Card */}
      <motion.div
        data-cta-card
        className="rounded-2xl bg-gradient-to-r from-brand-grad-peach via-brand-grad-violet to-brand-grad-sky p-8 md:p-12 text-center relative overflow-hidden"
        initial={{ opacity: 0, y: 20 }}
        whileInView={{ opacity: 1, y: 0 }}
        viewport={{ once: true }}
        transition={{ duration: 0.6, delay: 0.3 }}
      >
        <div className="relative">
          <div className="w-14 h-14 rounded-2xl bg-brand-purple-deep/10 flex items-center justify-center mx-auto mb-6">
            <TrendingUp size={28} className="text-brand-purple-deep" />
          </div>
          <h3 className="font-serif text-2xl md:text-3xl font-bold text-brand-purple-deep mb-3">
            Start Your Transformation
          </h3>
          <p className="text-brand-purple-deep/60 mb-8 max-w-xl mx-auto">
            INFINITH와 함께 데이터 기반 마케팅 전환을 시작하세요. 90일 안에 측정 가능한 성과를 만들어 드립니다.
          </p>
          <div className="flex flex-col sm:flex-row items-center justify-center gap-4">
            <button
              type="button"
              onClick={() => navigate(`/plan/${id || 'live'}#branding-guide`)}
              className="inline-flex items-center gap-2 bg-gradient-to-r from-brand-purple to-brand-purple-deep text-white font-semibold px-8 py-4 rounded-full hover:shadow-xl transition-all"
            >
              마케팅 기획
              <ArrowUpRight size={18} />
            </button>
            <DropdownMenu>
              <DropdownMenuTrigger asChild>
                <button
                  type="button"
                  disabled={isExporting}
                  className="inline-flex items-center gap-2 bg-white border border-slate-200 text-brand-purple-deep font-semibold px-8 py-4 rounded-full hover:bg-slate-50 shadow-sm hover:shadow-md transition-all disabled:opacity-60 disabled:cursor-not-allowed"
                >
                  {isExporting ? (
                    <>
                      <Loader2 size={18} className="animate-spin" />
                      내보내는 중...
                    </>
                  ) : (
                    <>
                      <Download size={18} />
                      리포트 다운로드
                      <ChevronDown size={14} className="opacity-70" />
                    </>
                  )}
                </button>
              </DropdownMenuTrigger>
              <DropdownMenuContent>
                <DropdownMenuItem onSelect={() => exportPDF(baseFilename)}>
                  <FileText size={14} className="text-slate-500" />
                  <span>PDF로 저장</span>
                </DropdownMenuItem>
                <DropdownMenuItem
                  disabled={!report}
                  onSelect={() => report && exportReportCSV(baseFilename, report)}
                >
                  <FileSpreadsheet size={14} className="text-slate-500" />
                  <span>CSV로 저장</span>
                </DropdownMenuItem>
              </DropdownMenuContent>
            </DropdownMenu>
          </div>
        </div>
      </motion.div>
    </SectionWrapper>
  );
}