import { useState, useEffect, useCallback, useMemo } from 'react';
import { useNavigate } from 'react-router-dom';
import {
  Plus, Eye, CheckCircle, XCircle, Play,
  FileCode, Clock, Filter, X, Loader2, Users,
  ArrowUpDown, Ban, ChevronLeft, AlertTriangle,
} from 'lucide-react';
import { statusMap, statusColorMap, dbTypeColorMap } from '@/lib/constants';
import { useActionPermission } from '@/hooks/useAuth';
import PageHeader from '@/components/PageHeader';
import EmptyState from '@/components/EmptyState';
import { ticketApi } from '@/api/ticket';
import { ModalOverlay } from '@/components/ModalOverlay';

/* ------------------------------------------------------------------ */
/*  Types                                                              */
/* ------------------------------------------------------------------ */
interface PendingStep {
  step_number: number;
  step_name: string;
  step_type: string;
  approver_names: string[];
}

interface TicketItem {
  id: number;
  ticket_no: string | null;
  title: string;
  db_type: string;
  instance_id: number;
  instance_name: string | null;
  target_database: string;
  sql_content: string;
  status: string;
  priority: string;
  applicant_id: number;
  applicant_name: string | null;
  approver_id: number | null;
  approver_name: string | null;
  current_approver_name: string | null;
  pending_steps: PendingStep[];
  reason: string | null;
  audit_result: string | null;
  execute_result: string | null;
  create_time: string;
  review_time: string | null;
  execute_time: string | null;
  has_audit_step: boolean;
  has_execute_step: boolean;
  is_executor: boolean;
  is_approver: boolean;
  approvals?: ApprovalRecord[];
}

interface ApprovalRecord {
  id: number;
  step_number: number;
  step_name: string | null;
  step_type: string | null;
  approver_id: number | null;
  approver_name: string;
  actual_approver_id: number | null;
  actual_approver_name: string;
  action: string | null;
  comment: string | null;
  completed_at: string | null;
}

interface TicketListResponse {
  total: number;
  page: number;
  page_size: number;
  items: TicketItem[];
}

interface TicketStatistics {
  total: number;
  pending: number;
  reviewing: number;
  approved: number;
  rejected: number;
  executing: number;
  success: number;
  failed: number;
}

interface ExecuteResult {
  status: string;
  affected_rows: number;
  duration_ms: number;
  validation_passed: boolean;
  warnings: string[];
  errors: string[];
  raw_output: string;
  before_snapshot?: string;
  after_snapshot?: string;
}

/* ------------------------------------------------------------------ */
/*  Constants                                                          */
/* ------------------------------------------------------------------ */

/** 展示用状态映射 — 按用户要求简化 */
const displayStatusMap: Record<string, string> = {
  pending: '审核中',
  reviewing: '审核中',
  approved: '审核中',
  rejected: '已拒绝',
  executing: '执行中',
  success: '完成',
  failed: '失败',
  rollback: '已回滚',
};

const displayStatusColorMap: Record<string, string> = {
  pending: 'bg-blue-500/15 text-blue-400',
  reviewing: 'bg-blue-500/15 text-blue-400',
  approved: 'bg-blue-500/15 text-blue-400',
  rejected: 'bg-red-500/15 text-red-400',
  executing: 'bg-purple-500/15 text-purple-400',
  success: 'bg-green-500/15 text-green-400',
  failed: 'bg-red-500/15 text-red-400',
  rollback: 'bg-orange-500/15 text-orange-400',
};

/** Design-system badge class per status */
const dgBadgeStatusMap: Record<string, string> = {
  pending: 'dg-badge-blue',
  reviewing: 'dg-badge-blue',
  approved: 'dg-badge-blue',
  rejected: 'dg-badge-red',
  executing: 'dg-badge-orange',
  success: 'dg-badge-green',
  failed: 'dg-badge-red',
  rollback: 'dg-badge-orange',
};

/** Design-system badge class per db type */
const dgBadgeDbMap: Record<string, string> = {
  mysql: 'dg-badge-blue',
  postgres: 'dg-badge-purple',
  postgresql: 'dg-badge-purple',
  redis: 'dg-badge-red',
  mongo: 'dg-badge-green',
  mongodb: 'dg-badge-green',
};

const statusFlow = ['pending', 'reviewing', 'approved', 'executing', 'success'];

/* ------------------------------------------------------------------ */
/*  Helpers                                                            */
/* ------------------------------------------------------------------ */

function getStatusIndex(status: string): number {
  return statusFlow.indexOf(status);
}

function parseExecuteResult(raw: string | null): ExecuteResult | null {
  if (!raw) return null;
  try {
    return JSON.parse(raw) as ExecuteResult;
  } catch {
    return null;
  }
}

/* ------------------------------------------------------------------ */
/*  Skeleton                                                           */
/* ------------------------------------------------------------------ */
function TableRowSkeleton() {
  return (
    <tr className="border-b border-[var(--dg-border-light)]">
      <td className="px-4 py-3.5"><div className="h-4 w-32 animate-pulse rounded bg-[var(--dg-bg-tertiary)]" /></td>
      <td className="px-4 py-3.5"><div className="h-4 w-24 animate-pulse rounded bg-[var(--dg-bg-tertiary)]" /></td>
      <td className="px-4 py-3.5"><div className="h-4 w-16 animate-pulse rounded bg-[var(--dg-bg-tertiary)]" /></td>
      <td className="px-4 py-3.5"><div className="h-4 w-16 animate-pulse rounded bg-[var(--dg-bg-tertiary)]" /></td>
      <td className="px-4 py-3.5"><div className="h-4 w-16 animate-pulse rounded bg-[var(--dg-bg-tertiary)]" /></td>
      <td className="px-4 py-3.5"><div className="h-4 w-24 animate-pulse rounded bg-[var(--dg-bg-tertiary)]" /></td>
      <td className="px-4 py-3.5"><div className="h-4 w-20 animate-pulse rounded bg-[var(--dg-bg-tertiary)]" /></td>
    </tr>
  );
}

/* ------------------------------------------------------------------ */
/*  Main Page                                                          */
/* ------------------------------------------------------------------ */
export default function TicketsPage() {
  const navigate = useNavigate();
  const canCreate = useActionPermission('ticket.create');
  const canApprove = useActionPermission('ticket.approve');
  const canExecute = useActionPermission('ticket.execute');

  const [search, setSearch] = useState('');
  const [statusFilter, setStatusFilter] = useState('');
  const [tickets, setTickets] = useState<TicketItem[]>([]);
  const [total, setTotal] = useState(0);
  const [page, setPage] = useState(1);
  const [pageSize] = useState(10);
  const [loading, setLoading] = useState(false);
  const [stats, setStats] = useState<TicketStatistics | null>(null);
  const [sortAsc, setSortAsc] = useState(false);

  // Detail dialog
  const [detailTicket, setDetailTicket] = useState<TicketItem | null>(null);

  const fetchTickets = useCallback(async () => {
    setLoading(true);
    try {
      const res = await ticketApi.list({
        page, page_size: pageSize,
        status: statusFilter || undefined,
        keyword: search || undefined,
      }) as unknown as TicketListResponse;
      setTickets(res.items || []);
      setTotal(res.total);
    } catch {
      /* keep existing data on error */
    } finally {
      setLoading(false);
    }
  }, [page, pageSize, statusFilter, search]);

  const fetchStats = useCallback(async () => {
    try {
      const res = await ticketApi.statistics() as unknown as TicketStatistics;
      setStats(res);
    } catch {
      /* ignore */
    }
  }, []);

  useEffect(() => { fetchTickets(); }, [fetchTickets]);
  useEffect(() => { fetchStats(); }, [fetchStats]);

  // executing 状态工单自动轮询（3秒）
  const hasExecuting = tickets.some(t => t.status === 'executing');
  useEffect(() => {
    if (!hasExecuting) return;
    const timer = setInterval(() => { fetchTickets(); fetchStats(); }, 3000);
    return () => clearInterval(timer);
  }, [hasExecuting, fetchTickets, fetchStats]);

  const totalPages = Math.ceil(total / pageSize);

  const sortedTickets = useMemo(() => {
    const result = [...tickets];
    result.sort((a, b) => {
      return sortAsc
        ? new Date(a.create_time).getTime() - new Date(b.create_time).getTime()
        : new Date(b.create_time).getTime() - new Date(a.create_time).getTime();
    });
    return result;
  }, [tickets, sortAsc]);

  /* ---- Status Summary Cards (design system) ---- */
  const statusSummaryCards = useMemo(() => [
    { key: 'pending', label: '待审核', count: (stats?.pending || 0) + (stats?.reviewing || 0) + (stats?.approved || 0), dot: 'dg-status-dot-blue' },
    { key: 'executing', label: '执行中', count: stats?.executing || 0, dot: 'dg-status-dot-orange' },
    { key: 'success', label: '已完成', count: stats?.success || 0, dot: 'dg-status-dot-green' },
    { key: 'failed', label: '失败/拒绝', count: (stats?.failed || 0) + (stats?.rejected || 0), dot: 'dg-status-dot-red' },
  ], [stats]);

  /* ---- Open detail dialog ---- */
  const openDetail = useCallback(async (ticketId: number) => {
    try {
      const detail = await ticketApi.get(ticketId) as unknown as TicketItem;
      setDetailTicket(detail);
    } catch { /* ignore */ }
  }, []);

  return (
    <div className="space-y-5">
      <PageHeader
        title="数据变更工单"
        description="管理 SQL 变更工单，提交审核、查看审批进度与执行结果"
        action={canCreate ? {
          label: '新建工单', icon: Plus, onClick: () => navigate('/tickets/create'), permission: 'ticket.create'
        } : undefined}
      />

      {/* Status Summary Cards */}
      <div className="grid grid-cols-4 gap-4">
        {stats === null ? (
          Array.from({ length: 4 }).map((_, i) => (
            <div key={i} className="dg-card-section animate-pulse">
              <div className="dg-card-header">
                <div className="h-8 w-12 rounded bg-[var(--dg-bg-tertiary)]" />
                <div className="h-3 w-16 rounded bg-[var(--dg-bg-tertiary)]" />
              </div>
            </div>
          ))
        ) : (
          statusSummaryCards.map(card => (
            <button
              key={card.key}
              onClick={() => { setStatusFilter(statusFilter === card.key ? '' : card.key); setPage(1); }}
              className={`dg-card-section text-left transition-all cursor-pointer hover:ring-1 hover:ring-[var(--dg-border)] ${
                statusFilter === card.key ? 'ring-1 ring-blue-500/30 bg-blue-500/5' : ''
              }`}
            >
              <div className="dg-card-header flex items-center justify-between">
                <span className="text-2xl font-bold">{card.count}</span>
                <span className={`dg-status-dot ${card.dot}`} />
              </div>
              <span className="text-xs text-[var(--dg-text-secondary)] mt-1 block">{card.label}</span>
            </button>
          ))
        )}
      </div>

      {/* Search + Filters */}
      <div className="flex flex-col sm:flex-row gap-3">
        <div className="relative flex-1 max-w-md">
          <Filter className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-[var(--dg-text-muted)]" />
          <input
            className="dg-input w-full pl-10 pr-4 py-2.5"
            placeholder="搜索工单标题或SQL内容..."
            value={search}
            onChange={e => { setSearch(e.target.value); setPage(1); }}
          />
          {search && (
            <button onClick={() => { setSearch(''); setPage(1); }} className="absolute right-3 top-1/2 -translate-y-1/2 text-[var(--dg-text-muted)] hover:text-[var(--dg-text-primary)]">
              <X className="w-4 h-4" />
            </button>
          )}
        </div>
      </div>

      {/* Ticket Table */}
      <div className="dg-card overflow-hidden">
        <div className="p-0">
          {loading && tickets.length === 0 ? (
            <div className="overflow-x-auto">
              <table className="w-full text-sm">
                <thead>
                  <tr className="dg-table-header">
                    <th className="text-left px-4 py-3 font-semibold">工单编号</th>
                    <th className="text-left px-4 py-3 font-semibold">实例名称</th>
                    <th className="text-left px-4 py-3 font-semibold">提交人</th>
                    <th className="text-left px-4 py-3 font-semibold">待处理</th>
                    <th className="text-left px-4 py-3 font-semibold">状态</th>
                    <th className="text-left px-4 py-3 font-semibold">
                      <button onClick={() => setSortAsc(!sortAsc)} className="flex items-center gap-1 hover:text-blue-400 transition-colors">
                        创建时间 <ArrowUpDown className="w-3 h-3" />
                      </button>
                    </th>
                    <th className="text-left px-4 py-3 font-semibold">操作</th>
                  </tr>
                </thead>
                <tbody>
                  {Array.from({ length: 5 }).map((_, i) => <TableRowSkeleton key={i} />)}
                </tbody>
              </table>
            </div>
          ) : tickets.length === 0 ? (
            <EmptyState type="search" />
          ) : (
            <div className="overflow-x-auto">
              <table className="w-full text-sm">
                <thead>
                  <tr className="dg-table-header">
                    <th className="text-left px-4 py-3 font-semibold">工单编号</th>
                    <th className="text-left px-4 py-3 font-semibold">实例名称</th>
                    <th className="text-left px-4 py-3 font-semibold">提交人</th>
                    <th className="text-left px-4 py-3 font-semibold">待处理</th>
                    <th className="text-left px-4 py-3 font-semibold">状态</th>
                    <th className="text-left px-4 py-3 font-semibold">
                      <button onClick={() => setSortAsc(!sortAsc)} className="flex items-center gap-1 hover:text-blue-400 transition-colors">
                        创建时间 <ArrowUpDown className="w-3 h-3" />
                      </button>
                    </th>
                    <th className="text-left px-4 py-3 font-semibold">操作</th>
                  </tr>
                </thead>
                <tbody>
                  {sortedTickets.map(ticket => (
                    <tr
                      key={ticket.id}
                      className="dg-table-row"
                    >
                      {/* 工单编号 */}
                      <td className="px-4 py-3.5">
                        <div className="flex flex-col">
                          <span className="font-mono text-xs text-[var(--dg-text-primary)]">{ticket.ticket_no || `TK-${ticket.id}`}</span>
                          <span className="text-[11px] text-[var(--dg-text-muted)] mt-0.5 max-w-[180px] truncate">{ticket.title}</span>
                        </div>
                      </td>

                      {/* 实例名称 */}
                      <td className="px-4 py-3.5">
                        <div className="flex items-center gap-2">
                          <span className={`dg-badge ${dgBadgeDbMap[ticket.db_type] || 'dg-badge-blue'}`}>
                            {ticket.db_type.toUpperCase()}
                          </span>
                          <span className="text-sm">{ticket.instance_name || '-'}</span>
                        </div>
                      </td>

                      {/* 提交人 */}
                      <td className="px-4 py-3.5">
                        <div className="flex items-center gap-1.5">
                          <Users className="w-3 h-3 text-[var(--dg-text-muted)]" />
                          <span className="text-sm">{ticket.applicant_name || '-'}</span>
                        </div>
                      </td>

                      {/* 待处理 */}
                      <td className="px-4 py-3.5">
                        {ticket.pending_steps?.length > 0 ? (
                          <div className="flex flex-col gap-1">
                            {ticket.pending_steps.map((ps) => (
                              <div key={ps.step_number} className="flex items-center gap-1.5 text-xs">
                                <span className="text-[var(--dg-text-muted)] shrink-0">{ps.step_name}:</span>
                                <span className="text-[var(--dg-text-primary)] font-medium">{ps.approver_names.join(', ')}</span>
                              </div>
                            ))}
                          </div>
                        ) : (
                          <span className="text-sm text-[var(--dg-text-muted)]">
                            {['success', 'failed', 'rejected', 'rollback'].includes(ticket.status) ? '-' : '-'}
                          </span>
                        )}
                      </td>

                      {/* 状态 */}
                      <td className="px-4 py-3.5">
                        <span className={`dg-badge ${dgBadgeStatusMap[ticket.status] || 'dg-badge-blue'}`}>
                          {displayStatusMap[ticket.status] || statusMap[ticket.status] || ticket.status}
                        </span>
                      </td>

                      {/* 创建时间 */}
                      <td className="px-4 py-3.5 text-xs text-[var(--dg-text-secondary)]">
                        {new Date(ticket.create_time).toLocaleString()}
                      </td>

                      {/* 操作 */}
                      <td className="px-4 py-3.5">
                        <div className="flex gap-2">
                          <button
                            onClick={() => openDetail(ticket.id)}
                            className="dg-btn dg-btn-sm dg-btn-ghost"
                          >
                            <Eye className="w-3.5 h-3.5" />
                            {ticket.status === 'success' || ticket.status === 'failed' ? '详情' : '查看'}
                          </button>

                          {canApprove && ticket.is_approver && (ticket.status === 'pending' || ticket.status === 'reviewing') && (
                            <button
                              onClick={async () => {
                                try {
                                  await ticketApi.review(ticket.id, { action: 'approve', comment: '通过' });
                                  fetchTickets(); fetchStats();
                                } catch { /* ignore */ }
                              }}
                              className="dg-btn dg-btn-sm dg-btn-ghost text-green-400 hover:text-green-300"
                            >
                              <CheckCircle className="w-3.5 h-3.5" />
                              通过
                            </button>
                          )}

                          {canApprove && ticket.is_approver && (ticket.status === 'pending' || ticket.status === 'reviewing') && (
                            <button
                              onClick={async () => {
                                try {
                                  await ticketApi.review(ticket.id, { action: 'reject', comment: '拒绝' });
                                  fetchTickets(); fetchStats();
                                } catch { /* ignore */ }
                              }}
                              className="dg-btn dg-btn-sm dg-btn-ghost text-red-400 hover:text-red-300"
                            >
                              <XCircle className="w-3.5 h-3.5" />
                              拒绝
                            </button>
                          )}

                          {canExecute && ticket.is_executor && (ticket.status === 'approved' || ticket.status === 'reviewing') && (
                            <button
                              onClick={async () => {
                                try {
                                  await ticketApi.execute(ticket.id);
                                  fetchTickets(); fetchStats();
                                } catch { /* ignore */ }
                              }}
                              className="dg-btn dg-btn-sm dg-btn-ghost text-purple-400 hover:text-purple-300"
                            >
                              <Play className="w-3.5 h-3.5" />
                              执行
                            </button>
                          )}

                          {(ticket.status === 'pending' || ticket.status === 'reviewing') && (
                            <button
                              onClick={async () => {
                                try {
                                  await ticketApi.cancel(ticket.id);
                                  fetchTickets(); fetchStats();
                                } catch { /* ignore */ }
                              }}
                              className="dg-btn dg-btn-sm dg-btn-ghost text-amber-400 hover:text-amber-300"
                            >
                              <Ban className="w-3.5 h-3.5" />
                              撤销
                            </button>
                          )}
                        </div>
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          )}

          {/* Pagination */}
          {totalPages > 1 && (
            <div className="flex items-center justify-between px-4 py-4 border-t border-[var(--dg-border)]">
              <span className="text-sm text-[var(--dg-text-muted)]">共 {total} 条</span>
              <div className="flex gap-1">
                <button
                  disabled={page <= 1}
                  onClick={() => setPage(p => p - 1)}
                  className="dg-btn dg-btn-ghost dg-btn-sm disabled:opacity-50"
                >
                  上一页
                </button>
                {Array.from({ length: Math.min(totalPages, 5) }, (_, i) => {
                  let p: number;
                  if (totalPages <= 5) {
                    p = i + 1;
                  } else if (page <= 3) {
                    p = i + 1;
                  } else if (page >= totalPages - 2) {
                    p = totalPages - 4 + i;
                  } else {
                    p = page - 2 + i;
                  }
                  return (
                    <button
                      key={p}
                      onClick={() => setPage(p)}
                      className={`dg-btn dg-btn-sm dg-btn-ghost ${
                        p === page ? 'bg-blue-500 text-white hover:bg-blue-500' : ''
                      }`}
                    >
                      {p}
                    </button>
                  );
                })}
                <button
                  disabled={page >= totalPages}
                  onClick={() => setPage(p => p + 1)}
                  className="dg-btn dg-btn-ghost dg-btn-sm disabled:opacity-50"
                >
                  下一页
                </button>
              </div>
            </div>
          )}
        </div>
      </div>

      {/* Detail Dialog */}
      {detailTicket && (
        <TicketDetailDialog
          ticket={detailTicket}
          onClose={() => setDetailTicket(null)}
          canApprove={canApprove}
          canExecute={canExecute}
          onActionDone={() => { setDetailTicket(null); fetchTickets(); fetchStats(); }}
        />
      )}
    </div>
  );
}


/* ------------------------------------------------------------------ */
/*  Ticket Detail Dialog                                               */
/* ------------------------------------------------------------------ */
function TicketDetailDialog({ ticket: initialTicket, onClose, canApprove, canExecute, onActionDone }: {
  ticket: TicketItem;
  onClose: () => void;
  canApprove: boolean;
  canExecute: boolean;
  onActionDone: () => void;
}) {
  const [loading, setLoading] = useState(false);
  const [ticket, setTicket] = useState<TicketItem>(initialTicket);
  const [approvals, setApprovals] = useState<ApprovalRecord[]>([]);

  // Load full detail on mount
  useEffect(() => {
    (async () => {
      try {
        const detail = await ticketApi.get(ticket.id) as any;
        setTicket(prev => ({ ...prev, ...detail }));
        setApprovals(detail.approvals || []);
      } catch { /* ignore */ }
    })();
  }, [ticket.id]);

  const execResult = parseExecuteResult(ticket.execute_result);

  const currentStepIndex = getStatusIndex(ticket.status);
  const statusDisplay = [
    { key: 'pending', label: '提交', icon: FileCode },
    { key: 'reviewing', label: '审批', icon: Eye },
    { key: 'approved', label: '通过', icon: CheckCircle },
    { key: 'executing', label: '执行', icon: Loader2 },
    { key: 'success', label: '完成', icon: CheckCircle },
  ];

  const handleReview = useCallback(async (action: 'approve' | 'reject') => {
    setLoading(true);
    try {
      await ticketApi.review(ticket.id, { action, comment: action === 'approve' ? '审批通过' : '拒绝' });
      onActionDone();
    } catch { /* ignore */ } finally { setLoading(false); }
  }, [ticket.id, onActionDone]);

  const handleExecute = useCallback(async () => {
    setLoading(true);
    try {
      await ticketApi.execute(ticket.id);
      onActionDone();
    } catch { /* ignore */ } finally { setLoading(false); }
  }, [ticket.id, onActionDone]);

  return (
    <ModalOverlay open={true} onClose={onClose} width="max-w-3xl" className="border border-[var(--dg-border)] overflow-hidden flex flex-col">
      <div
        className="w-full max-h-[85vh] overflow-hidden flex flex-col"
      >
        {/* Header */}
        <div className="flex items-center justify-between px-6 py-4 border-b border-[var(--dg-border)]">
          <div className="flex items-center gap-3">
            <span className="font-mono text-xs text-[var(--dg-text-muted)]">{ticket.ticket_no || `TK-${ticket.id}`}</span>
            <span className={`dg-badge ${dgBadgeStatusMap[ticket.status] || 'dg-badge-blue'}`}>
              {displayStatusMap[ticket.status] || statusMap[ticket.status] || ticket.status}
            </span>
          </div>
          <div className="flex items-center gap-2">
            {canApprove && ticket.is_approver && (ticket.status === 'pending' || ticket.status === 'reviewing') && (
              <>
                <button
                  onClick={() => handleReview('approve')}
                  disabled={loading}
                  className="dg-btn dg-btn-sm bg-green-500/15 text-green-400 border border-green-500/30 hover:bg-green-500/25 disabled:opacity-50"
                >
                  <CheckCircle className="w-3.5 h-3.5" /> 通过
                </button>
                <button
                  onClick={() => handleReview('reject')}
                  disabled={loading}
                  className="dg-btn dg-btn-sm bg-red-500/15 text-red-400 border border-red-500/30 hover:bg-red-500/25 disabled:opacity-50"
                >
                  <XCircle className="w-3.5 h-3.5" /> 拒绝
                </button>
              </>
            )}
            {canExecute && ticket.is_executor && (ticket.status === 'approved' || ticket.status === 'reviewing') && (
              <button
                onClick={handleExecute}
                disabled={loading}
                className="dg-btn dg-btn-sm bg-purple-500/15 text-purple-400 border border-purple-500/30 hover:bg-purple-500/25 disabled:opacity-50"
              >
                <Play className="w-3.5 h-3.5" /> 执行
              </button>
            )}
            <button onClick={onClose} className="text-[var(--dg-text-muted)] hover:text-[var(--dg-text-primary)] transition-colors ml-2">
              <X className="w-5 h-5" />
            </button>
          </div>
        </div>

        {/* Scrollable Content */}
        <div className="flex-1 overflow-y-auto p-6 space-y-5">

          {/* Status Flow */}
          <div className="flex items-center justify-between">
            {statusDisplay.map((step, idx) => {
              const StepIcon = step.icon;
              const isCompleted = idx <= currentStepIndex && currentStepIndex >= 0;
              const isCurrent = idx === currentStepIndex;
              const isFailed = ticket.status === 'failed' || ticket.status === 'rejected';
              const showFailed = isFailed && idx === currentStepIndex;
              return (
                <div key={step.key} className="flex items-center flex-1">
                  <div className="flex flex-col items-center gap-1.5">
                    <div className={`w-8 h-8 rounded-full flex items-center justify-center transition-all ${
                      showFailed ? 'bg-red-500/15 text-red-400' :
                      isCurrent ? 'bg-blue-500/15 text-blue-400 ring-2 ring-blue-500/30' :
                      isCompleted ? 'bg-green-500/15 text-green-400' :
                      'bg-[var(--dg-bg-tertiary)] text-[var(--dg-text-muted)]'
                    }`}>
                      {showFailed ? <XCircle className="w-4 h-4" /> : <StepIcon className="w-4 h-4" />}
                    </div>
                    <span className={`text-[10px] font-medium ${
                      showFailed ? 'text-red-400' :
                      isCurrent ? 'text-blue-400' :
                      isCompleted ? 'text-green-400' :
                      'text-[var(--dg-text-muted)]'
                    }`}>
                      {showFailed ? (ticket.status === 'rejected' ? '已拒绝' : '失败') : step.label}
                    </span>
                  </div>
                  {idx < statusDisplay.length - 1 && (
                    <div className={`flex-1 h-[2px] mx-2 rounded-full transition-all ${
                      idx < currentStepIndex && currentStepIndex >= 0 ? 'bg-green-400/50' : 'bg-[var(--dg-border)]'
                    }`} />
                  )}
                </div>
              );
            })}
          </div>

          {/* Info Grid */}
          <div className="grid grid-cols-2 gap-x-6 gap-y-3">
            {[
              { label: '提交人', value: ticket.applicant_name || '-' },
              { label: '当前审核人', value: ticket.current_approver_name || (ticket.status === 'approved' ? '待执行' : '-') },
              { label: '实例', value: ticket.instance_name || '-' },
              { label: '目标库', value: ticket.target_database },
              { label: '数据库类型', value: ticket.db_type.toUpperCase() },
              { label: '创建时间', value: new Date(ticket.create_time).toLocaleString() },
              { label: '变更原因', value: ticket.reason || '-' },
              { label: '优先级', value: ticket.priority === 'high' ? '高' : ticket.priority === 'low' ? '低' : '中' },
            ].map((item, idx) => (
              <div key={idx} className="flex justify-between py-1.5">
                <span className="text-xs text-[var(--dg-text-muted)]">{item.label}</span>
                <span className="text-xs font-medium">{item.value}</span>
              </div>
            ))}
          </div>

          {/* SQL Content */}
          <div>
            <h3 className="text-sm font-medium mb-2 flex items-center gap-1.5">
              <FileCode className="w-4 h-4 text-blue-400" /> SQL 语句
            </h3>
            <pre className="p-4 bg-[var(--dg-bg-tertiary)] rounded-lg text-xs font-mono overflow-x-auto whitespace-pre-wrap max-h-[200px] overflow-y-auto">
              {ticket.sql_content}
            </pre>
          </div>

          {/* Execute Result — 结构化展示 */}
          {execResult && (
            <div>
              <h3 className="text-sm font-medium mb-2 flex items-center gap-1.5">
                <Play className="w-4 h-4 text-purple-400" /> 执行结果
              </h3>

              {/* Summary */}
              <div className="grid grid-cols-4 gap-3 mb-3">
                <div className="p-3 bg-[var(--dg-bg-tertiary)] rounded-lg text-center">
                  <div className="text-[10px] text-[var(--dg-text-muted)] mb-1">状态</div>
                  <div className={`text-sm font-medium ${execResult.status === 'success' ? 'text-green-400' : 'text-red-400'}`}>
                    {execResult.status === 'success' ? '执行成功' : '执行失败'}
                  </div>
                </div>
                <div className="p-3 bg-[var(--dg-bg-tertiary)] rounded-lg text-center">
                  <div className="text-[10px] text-[var(--dg-text-muted)] mb-1">影响行数</div>
                  <div className="text-sm font-medium">{execResult.affected_rows}</div>
                </div>
                <div className="p-3 bg-[var(--dg-bg-tertiary)] rounded-lg text-center">
                  <div className="text-[10px] text-[var(--dg-text-muted)] mb-1">执行耗时</div>
                  <div className="text-sm font-medium">{execResult.duration_ms}ms</div>
                </div>
                <div className="p-3 bg-[var(--dg-bg-tertiary)] rounded-lg text-center">
                  <div className="text-[10px] text-[var(--dg-text-muted)] mb-1">验证</div>
                  <div className={`text-sm font-medium ${execResult.validation_passed ? 'text-green-400' : 'text-red-400'}`}>
                    {execResult.validation_passed ? '通过' : '未通过'}
                  </div>
                </div>
              </div>

              {/* Raw Output */}
              {execResult.raw_output && (
                <div className="mb-3">
                  <div className="text-[10px] text-[var(--dg-text-muted)] mb-1">原始输出</div>
                  <pre className="p-3 bg-[var(--dg-bg-tertiary)] rounded-lg text-xs font-mono overflow-x-auto whitespace-pre-wrap max-h-[120px] overflow-y-auto">
                    {execResult.raw_output}
                  </pre>
                </div>
              )}

              {/* Errors */}
              {execResult.errors && execResult.errors.length > 0 && (
                <div>
                  <div className="text-[10px] text-red-400 mb-1">错误信息</div>
                  {execResult.errors.map((err, i) => (
                    <div key={i} className="flex items-start gap-2 p-2 mb-1 bg-red-500/5 border border-red-500/20 rounded-md text-xs text-red-400">
                      <AlertTriangle className="w-3 h-3 mt-0.5 flex-shrink-0" />
                      {err}
                    </div>
                  ))}
                </div>
              )}

              {/* Warnings */}
              {execResult.warnings && execResult.warnings.length > 0 && (
                <div className="mt-3">
                  <div className="text-[10px] text-amber-400 mb-1">警告信息</div>
                  {execResult.warnings.map((w, i) => (
                    <div key={i} className="p-2 mb-1 bg-amber-500/5 border border-amber-500/20 rounded-md text-xs text-amber-400">
                      {w}
                    </div>
                  ))}
                </div>
              )}

              {ticket.execute_time && (
                <div className="text-xs text-[var(--dg-text-muted)] mt-3">
                  执行时间: {new Date(ticket.execute_time).toLocaleString()}
                </div>
              )}
            </div>
          )}

          {/* Execute Result — plain text fallback for non-JSON results */}
          {!execResult && ticket.execute_result && (
            <div>
              <h3 className="text-sm font-medium mb-2 flex items-center gap-1.5">
                <Play className="w-4 h-4 text-purple-400" /> 执行结果
              </h3>
              <div className={`p-3 rounded-lg text-xs font-mono whitespace-pre-wrap ${
                ticket.status === 'failed' ? 'bg-red-500/5 border border-red-500/20 text-red-400' : 'bg-[var(--dg-bg-tertiary)]'
              }`}>
                {ticket.execute_result}
              </div>
              {ticket.execute_time && (
                <div className="text-xs text-[var(--dg-text-muted)] mt-2">
                  执行时间: {new Date(ticket.execute_time).toLocaleString()}
                </div>
              )}
            </div>
          )}

          {/* Failure reason for failed/rejected tickets without execute_result */}
          {(ticket.status === 'failed' || ticket.status === 'rejected') && !ticket.execute_result && (
            <div>
              <h3 className="text-sm font-medium mb-2 flex items-center gap-1.5">
                <AlertTriangle className="w-4 h-4 text-red-400" /> 失败原因
              </h3>
              <div className="p-3 bg-red-500/5 border border-red-500/20 rounded-lg text-xs text-red-400">
                {ticket.status === 'rejected' ? '工单已被拒绝' : '执行失败，请查看审批记录了解详情'}
              </div>
            </div>
          )}

          {/* Timeline — approval history */}
          {approvals.length > 0 && (
            <div>
              <h3 className="text-sm font-medium mb-3 flex items-center gap-1.5">
                <Clock className="w-4 h-4 text-blue-400" /> 操作时间线
              </h3>
              <div className="space-y-0">
                {/* Submit step */}
                <div className="flex gap-3 pb-3">
                  <div className="flex flex-col items-center">
                    <div className="w-6 h-6 rounded-full bg-green-500/15 text-green-400 flex items-center justify-center">
                      <FileCode className="w-3 h-3" />
                    </div>
                    <div className="w-[2px] flex-1 bg-[var(--dg-border)]" />
                  </div>
                  <div className="flex-1 pb-3">
                    <div className="text-xs font-medium text-green-400">提交申请</div>
                    <div className="text-xs text-[var(--dg-text-muted)] mt-0.5">
                      {ticket.applicant_name || `用户#${ticket.applicant_id}`} · {new Date(ticket.create_time).toLocaleString()}
                    </div>
                    {ticket.reason && (
                      <div className="text-xs text-[var(--dg-text-secondary)] mt-1 bg-[var(--dg-bg-tertiary)] rounded px-2 py-1">{ticket.reason}</div>
                    )}
                  </div>
                </div>

                {/* Group approvals by step_number */}
                {Object.values(
                  approvals.reduce((acc, a) => {
                    const key = `${a.step_number}_${a.step_name || ''}`;
                    if (!acc[key]) acc[key] = { step: a, users: [] };
                    acc[key].users.push(a);
                    return acc;
                  }, {} as Record<string, { step: ApprovalRecord; users: ApprovalRecord[] }>)
                ).map(({ step, users }, idx, arr) => {
                  const isCompleted = users.some(u => u.action);
                  const actor = users.find(u => u.actual_approver_id);
                  const StepIcon = step.step_type === 'execute' ? Play : Eye;
                  const isLast = idx === arr.length - 1;

                  return (
                    <div key={step.id} className="flex gap-3">
                      <div className="flex flex-col items-center">
                        <div className={`w-6 h-6 rounded-full flex items-center justify-center ${
                          isCompleted ? 'bg-green-500/15 text-green-400' :
                          step.action === 'reject' ? 'bg-red-500/15 text-red-400' :
                          'bg-blue-500/15 text-blue-400'
                        }`}>
                          <StepIcon className="w-3 h-3" />
                        </div>
                        {!isLast && <div className="w-[2px] flex-1 bg-[var(--dg-border)]" />}
                      </div>
                      <div className={`flex-1 ${!isLast ? 'pb-3' : ''}`}>
                        <div className={`text-xs font-medium ${
                          isCompleted ? 'text-green-400' :
                          step.action === 'reject' ? 'text-red-400' :
                          'text-blue-400'
                        }`}>
                          {step.step_name || (step.step_type === 'execute' ? '执行变更' : '审批')}
                          {!isCompleted && <span className="text-[var(--dg-text-muted)] font-normal ml-1">（待处理）</span>}
                        </div>
                        <div className="text-xs text-[var(--dg-text-muted)] mt-0.5">
                          指派人: {users.map(u => u.approver_name).filter(Boolean).join(', ') || '-'}
                        </div>
                        {actor && actor.completed_at && (
                          <div className="text-xs text-[var(--dg-text-secondary)] mt-0.5">
                            {actor.actual_approver_name} · {actor.action === 'approve' ? '通过' : actor.action === 'reject' ? '拒绝' : '执行'} · {new Date(actor.completed_at).toLocaleString()}
                            {actor.comment && <span className="ml-1 text-[var(--dg-text-muted)]">（{actor.comment}）</span>}
                          </div>
                        )}
                      </div>
                    </div>
                  );
                })}
              </div>
            </div>
          )}
        </div>
      </div>
    </ModalOverlay>
  );
}