import { useState, useMemo } from "react";
import PageHeader from "@/components/common/PageHeader";
import SearchInput from "@/components/common/SearchInput";
import FilterDropdown from "@/components/common/FilterDropdown";
import DateRangeInput from "@/components/common/DateRangeInput";
import FilterResetButton from "@/components/common/FilterResetButton";
import Pagination from "@/components/common/Pagination";
import EmptyState from "@/components/common/EmptyState";
import StatusBadge from "@/components/common/StatusBadge";
import CopyButton from "@/components/common/CopyButton";
import HistorySlidePanel from "../components/HistorySlidePanel";
import { formatNumber } from "@/utils/format";
import {
  SERVICE_FILTER_OPTIONS,
  STATUS_FILTER_OPTIONS,
  MOCK_SEND_HISTORY,
} from "../types";
import type { SendHistory } from "../types";

const PAGE_SIZE = 10;

const COLUMNS = [
  "발송 ID",
  "템플릿명",
  "발송 시간",
  "대상 수",
  "성공",
  "실패",
  "오픈율",
  "상태",
];

/** 상태 → StatusBadge variant 매핑 */
function getStatusVariant(status: string): "success" | "info" | "error" {
  if (status === "완료") return "success";
  if (status === "진행") return "info";
  return "error";
}

/** 오늘 날짜 YYYY-MM-DD */
function getToday() {
  return new Date().toISOString().slice(0, 10);
}
/** 1달 전 날짜 */
function getOneMonthAgo() {
  const d = new Date();
  d.setMonth(d.getMonth() - 1);
  return d.toISOString().slice(0, 10);
}

export default function StatisticsHistoryPage() {
  // 필터 입력 상태
  const [search, setSearch] = useState("");
  const [serviceFilter, setServiceFilter] = useState("전체 서비스");
  const [statusFilter, setStatusFilter] = useState("전체");
  const [dateStart, setDateStart] = useState(getOneMonthAgo);
  const [dateEnd, setDateEnd] = useState(getToday);
  const [currentPage, setCurrentPage] = useState(1);
  const [loading, setLoading] = useState(false);

  // 적용된 필터
  const [appliedSearch, setAppliedSearch] = useState("");
  const [appliedService, setAppliedService] = useState("전체 서비스");
  const [appliedStatus, setAppliedStatus] = useState("전체");

  // 슬라이드 패널
  const [panelOpen, setPanelOpen] = useState(false);
  const [selectedHistory, setSelectedHistory] = useState<SendHistory | null>(null);

  // 조회
  const handleQuery = () => {
    setLoading(true);
    setTimeout(() => {
      setAppliedSearch(search);
      setAppliedService(serviceFilter);
      setAppliedStatus(statusFilter);
      setCurrentPage(1);
      setLoading(false);
    }, 400);
  };

  // 필터 초기화
  const handleReset = () => {
    setSearch("");
    setServiceFilter("전체 서비스");
    setStatusFilter("전체");
    setDateStart(getOneMonthAgo());
    setDateEnd(getToday());
    setAppliedSearch("");
    setAppliedService("전체 서비스");
    setAppliedStatus("전체");
    setCurrentPage(1);
  };

  // 필터링
  const filtered = useMemo(() => {
    return MOCK_SEND_HISTORY.filter((d) => {
      if (appliedSearch) {
        const q = appliedSearch.toLowerCase();
        if (
          !d.id.toLowerCase().includes(q) &&
          !d.template.toLowerCase().includes(q)
        )
          return false;
      }
      if (appliedService !== "전체 서비스" && d.service !== appliedService) return false;
      if (appliedStatus !== "전체" && d.status !== appliedStatus) return false;
      return true;
    });
  }, [appliedSearch, appliedService, appliedStatus]);

  // 페이지네이션
  const totalItems = filtered.length;
  const totalPages = Math.max(1, Math.ceil(totalItems / PAGE_SIZE));
  const paged = filtered.slice(
    (currentPage - 1) * PAGE_SIZE,
    currentPage * PAGE_SIZE,
  );

  // 행 클릭
  const handleRowClick = (item: SendHistory) => {
    setSelectedHistory(item);
    setPanelOpen(true);
  };

  // 테이블 헤더 렌더링
  const renderTableHead = () => (
    <thead className="bg-gray-50 border-b border-gray-200">
      <tr>
        {COLUMNS.map((col) => (
          <th
            key={col}
            className="px-6 py-3 text-xs font-semibold uppercase text-gray-700 text-center"
          >
            {col}
          </th>
        ))}
      </tr>
    </thead>
  );

  return (
    <div>
      <PageHeader
        title="발송 이력"
        description="서비스별 메시지 발송 상세 이력을 확인합니다."
        action={
          <button className="flex items-center justify-center gap-2 min-w-[154px] px-5 py-2.5 bg-white border border-gray-300 hover:bg-gray-50 text-[#0f172a] rounded-lg text-sm font-medium transition-colors">
            <span className="material-symbols-outlined text-lg">download</span>
            엑셀 다운로드
          </button>
        }
      />

      {/* 필터바 */}
      <div className="bg-white border border-gray-200 rounded-lg p-6 mb-6">
        {/* 1줄: 검색어 / 서비스 / 상태 */}
        <div className="flex items-end gap-4">
          <SearchInput
            value={search}
            onChange={setSearch}
            placeholder="발송 ID 또는 템플릿명 검색"
            label="검색어"
            disabled={loading}
          />
          <FilterDropdown
            label="서비스 분류"
            value={serviceFilter}
            options={SERVICE_FILTER_OPTIONS}
            onChange={setServiceFilter}
            className="w-[160px] flex-shrink-0"
            disabled={loading}
          />
          <FilterDropdown
            label="상태"
            value={statusFilter}
            options={STATUS_FILTER_OPTIONS}
            onChange={setStatusFilter}
            className="w-[120px] flex-shrink-0"
            disabled={loading}
          />
        </div>
        {/* 2줄: 날짜 범위 / 버튼 */}
        <div className="flex items-end gap-4 mt-3">
          <DateRangeInput
            startDate={dateStart}
            endDate={dateEnd}
            onStartChange={setDateStart}
            onEndChange={setDateEnd}
            disabled={loading}
          />
          <FilterResetButton onClick={handleReset} disabled={loading} />
          <button
            onClick={handleQuery}
            disabled={loading}
            className="h-[38px] flex-shrink-0 bg-gray-800 hover:bg-gray-900 active:scale-95 text-white rounded-lg px-5 text-sm font-medium transition-all disabled:opacity-50 disabled:cursor-not-allowed"
          >
            조회
          </button>
        </div>
      </div>

      {/* 테이블 */}
      {loading ? (
        <div className="bg-white border border-gray-200 rounded-lg overflow-hidden shadow-sm">
          <table className="w-full text-sm">
            {renderTableHead()}
            <tbody>
              {Array.from({ length: 5 }).map((_, i) => (
                <tr
                  key={i}
                  className={i < 4 ? "border-b border-gray-100" : ""}
                >
                  {Array.from({ length: 8 }).map((_, j) => (
                    <td key={j} className="px-6 py-4 text-center">
                      <div className="h-4 w-16 rounded bg-gray-100 animate-pulse mx-auto" />
                    </td>
                  ))}
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      ) : paged.length > 0 ? (
        <div className="bg-white border border-gray-200 rounded-lg shadow-sm">
          <div className="overflow-x-auto">
            <table className="w-full text-sm">
              {renderTableHead()}
              <tbody>
                {paged.map((item, idx) => (
                  <tr
                    key={item.id}
                    className={`${idx < paged.length - 1 ? "border-b border-gray-100" : ""} hover:bg-gray-50/50 transition-colors cursor-pointer`}
                    onClick={() => handleRowClick(item)}
                  >
                    {/* 발송 ID */}
                    <td className="px-6 py-4 text-center">
                      <span
                        className="inline-flex items-center gap-1.5 font-mono text-xs text-gray-500"
                        onClick={(e) => e.stopPropagation()}
                      >
                        {item.id}
                        <CopyButton text={item.id} />
                      </span>
                    </td>
                    {/* 템플릿명 */}
                    <td className="px-6 py-4 text-center text-sm font-medium text-gray-900">
                      {item.template}
                    </td>
                    {/* 발송 시간 */}
                    <td className="px-6 py-4 text-center text-sm text-gray-500">
                      {item.sentAt}
                    </td>
                    {/* 대상 수 */}
                    <td className="px-6 py-4 text-center text-sm text-gray-900">
                      {formatNumber(item.total)}
                    </td>
                    {/* 성공 */}
                    <td className="px-6 py-4 text-center text-sm font-semibold text-primary">
                      {formatNumber(item.success)}
                    </td>
                    {/* 실패 */}
                    <td className={`px-6 py-4 text-center text-sm font-semibold ${item.fail > 0 ? "text-red-500" : "text-gray-400"}`}>
                      {formatNumber(item.fail)}
                    </td>
                    {/* 오픈율 */}
                    <td className="px-6 py-4 text-center text-sm font-bold text-gray-900">
                      {item.openRate}%
                    </td>
                    {/* 상태 */}
                    <td className="px-6 py-4 text-center">
                      <StatusBadge variant={getStatusVariant(item.status)} label={item.status} />
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>

          {/* 페이지네이션 */}
          <Pagination
            currentPage={currentPage}
            totalPages={totalPages}
            totalItems={totalItems}
            pageSize={PAGE_SIZE}
            onPageChange={setCurrentPage}
          />
        </div>
      ) : (
        <EmptyState
          icon="search_off"
          message="검색 결과가 없습니다"
          description="다른 검색어를 입력하거나 필터를 변경해보세요."
        />
      )}

      {/* 슬라이드 패널 */}
      <HistorySlidePanel
        isOpen={panelOpen}
        onClose={() => setPanelOpen(false)}
        history={selectedHistory}
      />
    </div>
  );
}