import { cn } from '@/lib/utils';
import { Card, CardContent } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { Input } from '@/components/ui/input';
import {
  Search,
  CheckCircle2,
  XCircle,
  Eye,
  Loader2,
  FileText,
} from 'lucide-react';
import {
  getProgressInfo,
  renderStepProgress,
  getApprovalTypeLabel,
  getApprovalTypeColor,
  getApprovalTypeIcon,
  getInstanceType,
} from './helpers';
import i18n from 'i18next';
import { useTranslation } from 'react-i18next';
import type { JsonData } from '@/types/common';

// 状态标签页定义
const STATUS_TABS = [
  { key: 'all', labelKey: 'common.all', value: '' },
  { key: 'pending', labelKey: 'approval.status.pending', value: 'pending' },
  { key: 'approved', labelKey: 'approval.status.approved', value: 'approved' },
  { key: 'rejected', labelKey: 'approval.status.rejected', value: 'rejected' },
  { key: 'processing', labelKey: 'approval.status.pending', value: 'processing' },
  { key: 'completed', labelKey: 'common.completed', value: 'completed' },
];

function getStatusBadge(status: string) {
  const statusMap: Record<string, { labelKey: string; className: string; dot: string }> = {
    pending: {
      labelKey: 'approval.status.pending',
      className: 'border-amber-500/30 dg-text-yellow bg-amber-500/10',
      dot: 'bg-amber-400',
    },
    approved: {
      labelKey: 'approval.status.approved',
      className: 'border-emerald-500/30 dg-text-green bg-emerald-500/10',
      dot: 'bg-emerald-400',
    },
    rejected: {
      labelKey: 'approval.status.rejected',
      className: 'border-red-500/30 dg-text-red bg-red-500/10',
      dot: 'bg-red-400',
    },
    processing: {
      labelKey: 'approval.status.pending',
      className: 'border-[var(--dg-blue)]/30 text-[var(--dg-blue)] bg-[var(--dg-blue)]/10',
      dot: 'bg-[var(--dg-blue)]',
    },
    completed: {
      labelKey: 'common.completed',
      className: 'border-[var(--dg-border)] text-[var(--dg-text-secondary)] bg-[var(--dg-bg-tertiary)]',
      dot: 'bg-[var(--dg-text-secondary)]',
    },
  };

  const config = statusMap[status] || statusMap.pending;
  return (
    <Badge variant="outline" className={config.className}>
      <div className={cn('w-1.5 h-1.5 rounded-full mr-1.5', config.dot)} />
      {i18n.t(config.labelKey)}
    </Badge>
  );
}

interface ApprovalProcessTabProps {
  processes: JsonData[];
  filteredInstances: JsonData[];
  loading: boolean;
  searchQuery: string;
  setSearchQuery: (v: string) => void;
  statusFilter: string;
  setStatusFilter: (v: string) => void;
  onView: (instance: JsonData) => void;
  onApprove: (instance: JsonData) => void;
  onReject: (instance: JsonData) => void;
}

export function ApprovalProcessTab({
  filteredInstances,
  loading,
  searchQuery,
  setSearchQuery,
  statusFilter,
  setStatusFilter,
  onView,
  onApprove,
  onReject,
}: ApprovalProcessTabProps) {
  const { t } = useTranslation();
  return (
    <>
      {/* 搜索 + 状态筛选 */}
      <div className="flex items-center justify-between flex-wrap gap-4">
        <div className="relative w-72">
          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-[var(--dg-text-muted)]" />
          <Input
            placeholder={t('approval.flow.searchPlaceholder')}
            value={searchQuery}
            onChange={(e) => setSearchQuery(e.target.value)}
            className="pl-9 h-9 bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)] text-[var(--dg-text-primary)] placeholder:text-[var(--dg-text-muted)]"
          />
        </div>
        <div className="flex items-center gap-1 bg-[var(--dg-bg-tertiary)] border border-[var(--dg-border)] rounded-lg p-1">
          {STATUS_TABS.map((tab) => (
            <button
              key={tab.key}
              onClick={() => setStatusFilter(tab.value)}
              className={cn(
                'px-3 py-1.5 rounded-md text-sm transition-colors',
                statusFilter === tab.value
                  ? 'bg-[var(--dg-bg-hover)] text-[var(--dg-text-primary)] font-medium'
                  : 'text-[var(--dg-text-secondary)] hover:text-[var(--dg-text-primary)]'
              )}
            >
              {t(tab.labelKey)}
            </button>
          ))}
        </div>
      </div>

      {/* 流程实例列表 */}
      {loading ? (
        <Card className="bg-[var(--dg-bg-secondary)] border-[var(--dg-border)]">
          <CardContent className="p-12">
            <div className="flex items-center justify-center text-[var(--dg-text-muted)]">
              <Loader2 className="h-6 w-6 animate-spin mr-2" />
              {t('common.loading')}
            </div>
          </CardContent>
        </Card>
      ) : filteredInstances.length === 0 ? (
        <Card className="bg-[var(--dg-bg-secondary)] border-[var(--dg-border)]">
          <CardContent className="p-12">
            <div className="text-center">
              <FileText className="h-12 w-12 mx-auto text-[var(--dg-text-muted)] mb-4" />
              <h3 className="text-lg font-medium text-[var(--dg-text-secondary)] mb-2">{t('approval.noInstances')}</h3>
              <p className="text-sm text-[var(--dg-text-muted)]">{t('approval.noInstancesDesc')}</p>
            </div>
          </CardContent>
        </Card>
      ) : (
        <div className="grid grid-cols-1 gap-4">
          {filteredInstances.map((instance) => {
            const Icon = getApprovalTypeIcon(getInstanceType(instance));
            const { percentage } = getProgressInfo(instance);
            return (
              <Card key={instance.id} className="bg-[var(--dg-bg-secondary)] border-[var(--dg-border)] hover:border-[var(--dg-border)] transition-colors">
                <CardContent className="p-4">
                  <div className="flex items-start justify-between mb-3">
                    <div className="flex items-start gap-3">
                      <div className="w-10 h-10 rounded-lg bg-[var(--dg-bg-tertiary)] flex items-center justify-center" style={{ color: getApprovalTypeColor(getInstanceType(instance)) }}>
                        <Icon className="h-5 w-5" />
                      </div>
                      <div>
                        <div className="flex items-center gap-2 mb-1">
                          <h3 className="font-medium text-[var(--dg-text-primary)]">{instance.title}</h3>
                          {getStatusBadge(instance.status)}
                        </div>
                        <div className="flex items-center gap-3 text-xs text-[var(--dg-text-muted)]">
                          <span className="flex items-center gap-1">
                            <Badge variant="outline" className="text-xs border-[var(--dg-border)]" style={{ color: getApprovalTypeColor(getInstanceType(instance)) }}>
                              {getApprovalTypeLabel(getInstanceType(instance))}
                            </Badge>
                          </span>
                          <span>{t('approval.detail.applicant')}: {instance.applicant_name || instance.applicant || '--'}</span>
                          <span>{t('approval.detail.submittedAt')} {instance.created_at ? new Date(instance.created_at).toLocaleString() : '--'}</span>
                        </div>
                      </div>
                    </div>
                    <div className="flex items-center gap-2">
                      <Button variant="ghost" size="sm" className="text-[var(--dg-text-secondary)] hover:text-[var(--dg-text-primary)]" onClick={() => onView(instance)}>
                        <Eye className="h-4 w-4 mr-1" />
                        {t('common.detail')}
                      </Button>
                      {instance.status === 'pending' && (
                        <>
                          <Button
                            variant="outline"
                            size="sm"
                            className="border-emerald-500/30 dg-text-green hover:bg-emerald-500/10"
                            onClick={() => onApprove(instance)}
                          >
                            <CheckCircle2 className="h-4 w-4 mr-1" />
                            {t('common.approve')}
                          </Button>
                          <Button
                            variant="outline"
                            size="sm"
                            className="border-red-500/30 dg-text-red hover:bg-red-500/10"
                            onClick={() => onReject(instance)}
                          >
                            <XCircle className="h-4 w-4 mr-1" />
                            {t('common.reject')}
                          </Button>
                        </>
                      )}
                    </div>
                  </div>
                  {/* {t('approval.detail.approvalProgress')}条 */}
                  <div className="mb-3">
                    <div className="flex items-center justify-between text-xs text-[var(--dg-text-muted)] mb-1.5">
                      <span>{t('approval.detail.approvalProgress')}</span>
                      <span>{percentage}%</span>
                    </div>
                    <div className="w-full h-1.5 bg-[var(--dg-bg-tertiary)] rounded-full overflow-hidden">
                      <div
                        className={cn(
                          'h-full rounded-full transition-all',
                          instance.status === 'rejected' ? 'bg-red-400' : 'bg-[var(--dg-blue)]'
                        )}
                        style={{ width: `${percentage}%` }}
                      />
                    </div>
                  </div>
                  {/* 步骤进度 */}
                  <div className="bg-[var(--dg-bg-primary)] rounded-lg p-3">
                    {renderStepProgress(instance)}
                  </div>
                </CardContent>
              </Card>
            );
          })}
        </div>
      )}
    </>
  );
}