import { useState } from 'react';
import { 
  CloudSync, GitBranch, RefreshCw, CheckCircle2, XCircle, 
  Clock, ChevronRight, TreePine, Diff, Layers,
  Server, AlertTriangle, FolderGit, Package
} from 'lucide-react';
import { toast } from 'sonner';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { api } from '@/lib/api';

interface Application {
  id: string;
  name: string;
  repo: string;
  branch: string;
  path: string;
  cluster: string;
  namespace: string;
  status: 'synced' | 'out-of-sync' | 'syncing' | 'error' | 'unknown';
  syncStatus: 'synced' | 'out-of-sync';
  health: 'healthy' | 'degraded' | 'progressing' | 'suspended';
  lastSync: string;
  resources: number;
  manifestType: 'helm' | 'kustomize' | 'plain';
  autoSync: boolean;
}

interface ResourceNode {
  id: string;
  kind: string;
  name: string;
  namespace: string;
  status: 'healthy' | 'degraded' | 'progressing' | 'suspended';
  children?: ResourceNode[];
}

const statusConfig: Record<string, { color: string; bg: string; label: string; icon: typeof CheckCircle2 }> = {
  synced: { color: '#1a7f37', bg: '#dafbe1', label: '已同步', icon: CheckCircle2 },
  'out-of-sync': { color: '#9a6700', bg: '#fff8c5', label: '待同步', icon: Clock },
  syncing: { color: '#0969da', bg: '#ddf4ff', label: '同步中', icon: RefreshCw },
  error: { color: '#cf222e', bg: '#ffebe9', label: '错误', icon: XCircle },
  unknown: { color: '#6e7781', bg: '#f6f8fa', label: '未知', icon: AlertTriangle },
};

const healthConfig: Record<string, { color: string; label: string; bg: string }> = {
  healthy: { color: '#1a7f37', label: '健康', bg: '#dafbe1' },
  degraded: { color: '#cf222e', label: '降级', bg: '#ffebe9' },
  progressing: { color: '#9a6700', label: '进行中', bg: '#fff8c5' },
  suspended: { color: '#6e7781', label: '暂停', bg: '#f6f8fa' },
};

const manifestConfig: Record<string, { label: string; icon: typeof Package }> = {
  helm: { label: 'Helm', icon: Package },
  kustomize: { label: 'Kustomize', icon: Layers },
  plain: { label: 'Plain YAML', icon: FolderGit },
};

export default function GitOpsDeploy() {
  const [selectedAppId, setSelectedAppId] = useState<string | null>(null);
  const [activeView, setActiveView] = useState<'list' | 'tree' | 'diff'>('list');
  const queryClient = useQueryClient();

  const { data: dbApps = [] } = useQuery({ queryKey: ['gitops', 'apps'], queryFn: () => api<any[]>('/api/gitops/apps') });
  const syncMutation = useMutation({
    mutationFn: (appName: string) => api<any>('/api/gitops/argo/sync', { method: 'POST', body: JSON.stringify({ appName }) }),
    onSuccess: (data) => {
      toast.success(data.message);
      queryClient.invalidateQueries({ queryKey: ['gitops'] });
    },
    onError: (err: Error) => toast.error(err.message),
  });

  // dbApps 直接携带 syncStatus/healthStatus（sync 动作会真实推进状态）
  const apps: Application[] = dbApps.map((db: any) => {
    const sync = (db.syncStatus || '').toLowerCase();
    return {
      id: String(db.id),
      name: db.name,
      repo: db.repo,
      branch: db.branch,
      path: db.path,
      cluster: db.cluster,
      namespace: db.namespace,
      status: sync === 'synced' ? 'synced' : sync === 'syncing' ? 'syncing' : sync === 'outofsync' ? 'out-of-sync' : 'unknown',
      syncStatus: sync === 'synced' ? 'synced' : 'out-of-sync',
      health: (db.healthStatus || 'unknown').toLowerCase(),
      lastSync: db.lastSyncAt ? new Date(db.lastSyncAt).toLocaleString('zh-CN', { hour12: false }) : '-',
      resources: 0,
      manifestType: db.manifestType,
      autoSync: db.syncPolicy === 'automated',
    };
  });

  const selectedApp = apps.find(a => a.id === selectedAppId) || apps[0];
  const selectedName = selectedApp?.name;

  // 资源树 / 差异：真实调用后端生成端点
  const { data: treeData, isLoading: treeLoading } = useQuery({
    queryKey: ['gitops', 'tree', selectedName],
    queryFn: () => api<any>(`/api/gitops/argo/${selectedName}/tree`),
    enabled: activeView === 'tree' && !!selectedName,
  });
  const { data: diffData, isLoading: diffLoading } = useQuery({
    queryKey: ['gitops', 'diff', selectedName],
    queryFn: () => api<any>(`/api/gitops/argo/${selectedName}/diff`),
    enabled: activeView === 'diff' && !!selectedName,
  });

  // nodes+edges 扁平结构 → 树
  const resourceTree: ResourceNode[] = (() => {
    if (!treeData?.nodes) return [];
    const byUid = new Map<string, ResourceNode>();
    for (const n of treeData.nodes) {
      byUid.set(n.uid, { id: n.uid, kind: n.kind, name: n.name, namespace: n.namespace, status: n.status });
    }
    const childSet = new Set<string>();
    for (const e of treeData.edges || []) {
      const parent = byUid.get(e.source);
      const child = byUid.get(e.target);
      if (parent && child) {
        parent.children = parent.children || [];
        parent.children.push(child);
        childSet.add(e.target);
      }
    }
    return treeData.nodes.filter((n: any) => !childSet.has(n.uid)).map((n: any) => byUid.get(n.uid)!);
  })();

  const renderResourceNode = (node: ResourceNode, depth: number = 0) => {
    const health = healthConfig[node.status];
    const hasChildren = node.children && node.children.length > 0;
    return (
      <div key={node.id} className="select-none">
        <div 
          className="flex items-center gap-2 py-1.5 px-3 hover:bg-black/[0.02] rounded-md cursor-pointer"
          style={{ paddingLeft: `${12 + depth * 20}px` }}
        >
          {hasChildren ? <ChevronRight className="w-3.5 h-3.5" style={{ color: 'var(--text-tertiary)' }} /> : <div className="w-3.5" />}
          <div className="w-2 h-2 rounded-full flex-shrink-0" style={{ background: health.color }} />
          <span className="text-[11px] font-medium px-1.5 py-[1px] rounded" style={{ background: 'var(--panel-bg-secondary)', color: 'var(--text-tertiary)' }}>{node.kind}</span>
          <span className="text-[12px] font-medium" style={{ color: 'var(--text-primary)' }}>{node.name}</span>
          <span className="text-[11px]" style={{ color: 'var(--text-tertiary)' }}>{node.namespace}</span>
        </div>
        {hasChildren && node.children!.map(child => renderResourceNode(child, depth + 1))}
      </div>
    );
  };

  return (
    <div className="h-full flex flex-col" style={{ background: 'var(--canvas-bg)' }}>
      {/* Header */}
      <div className="px-5 py-3 border-b flex items-center justify-between flex-shrink-0" style={{ background: 'var(--panel-bg)', borderColor: 'var(--border-color)' }}>
        <div className="flex items-center gap-3">
          <h1 className="text-[15px] font-semibold" style={{ color: 'var(--text-primary)' }}>GitOps 部署</h1>
          <span className="text-[11px] px-2 py-[2px] rounded-full font-medium" style={{ background: '#ddf4ff', color: 'var(--accent-blue)' }}>Argo CD</span>
        </div>
        <div className="flex items-center gap-2">
          <div className="flex items-center border rounded-md overflow-hidden" style={{ borderColor: 'var(--border-color-light)' }}>
            {[
              { id: 'list', label: '应用列表', icon: Layers },
              { id: 'tree', label: '资源树', icon: TreePine },
              { id: 'diff', label: '差异对比', icon: Diff },
            ].map(v => (
              <button key={v.id} onClick={() => setActiveView(v.id as any)}
                className="flex items-center gap-1 px-3 py-[5px] text-[12px] font-medium transition-colors"
                style={{ background: activeView === v.id ? 'var(--panel-bg-secondary)' : 'transparent', color: activeView === v.id ? 'var(--accent-blue)' : 'var(--text-secondary)' }}>
                <v.icon className="w-3.5 h-3.5" />{v.label}
              </button>
            ))}
          </div>
          <button onClick={() => { queryClient.invalidateQueries({ queryKey: ['gitops'] }); toast.success('已刷新'); }} className="flex items-center gap-1 px-3 py-[5px] text-[12px] font-medium rounded-md border" style={{ borderColor: 'var(--border-color-light)', color: 'var(--text-secondary)' }}>
            <RefreshCw className="w-3.5 h-3.5" />刷新
          </button>
        </div>
      </div>

      {/* Content */}
      <div className="flex-1 overflow-hidden flex">
        {/* App list sidebar */}
        <div className="w-[280px] border-r flex flex-col flex-shrink-0" style={{ background: 'var(--panel-bg)', borderColor: 'var(--border-color)' }}>
          <div className="px-3 py-2 text-[11px] font-semibold uppercase" style={{ color: 'var(--text-tertiary)' }}>Applications ({apps.length})</div>
          <div className="flex-1 overflow-y-auto custom-scrollbar">
            {apps.map(app => {
              const st = statusConfig[app.status];
              const hl = healthConfig[app.health];
              const mf = manifestConfig[app.manifestType];
              const isSelected = selectedAppId === app.id;
              return (
                <div key={app.id} onClick={() => setSelectedAppId(app.id)}
                  className="mx-2 mb-1 p-2.5 rounded-md cursor-pointer border transition-all"
                  style={{ 
                    background: isSelected ? 'var(--accent-blue-light)' : 'transparent',
                    borderColor: isSelected ? 'var(--accent-blue)' : 'transparent',
                  }}>
                  <div className="flex items-center justify-between mb-1">
                    <span className="text-[13px] font-semibold" style={{ color: 'var(--text-primary)' }}>{app.name}</span>
                    <span className="text-[10px] px-1.5 py-[1px] rounded font-medium flex items-center gap-1" style={{ background: st.bg, color: st.color }}>
                      <st.icon className="w-3 h-3" />{st.label}
                    </span>
                  </div>
                  <div className="flex items-center gap-1.5 mb-1">
                    <GitBranch className="w-3 h-3" style={{ color: 'var(--text-tertiary)' }} />
                    <span className="text-[11px] font-mono truncate" style={{ color: 'var(--text-secondary)' }}>{app.repo.replace('https://', '').replace('.git', '')}</span>
                  </div>
                  <div className="flex items-center justify-between">
                    <div className="flex items-center gap-2">
                      <span className="text-[10px] flex items-center gap-1" style={{ color: 'var(--text-tertiary)' }}><mf.icon className="w-3 h-3" />{mf.label}</span>
                      <span className="text-[10px]" style={{ color: hl.color }}>{hl.label}</span>
                    </div>
                    <span className="text-[10px]" style={{ color: 'var(--text-tertiary)' }}>{app.lastSync}</span>
                  </div>
                </div>
              );
            })}
          </div>
        </div>

        {/* Detail view */}
        <div className="flex-1 overflow-y-auto custom-scrollbar p-5">
          {!selectedApp ? (
            <div className="h-full flex flex-col items-center justify-center text-center" style={{ color: 'var(--text-tertiary)' }}>
              <CloudSync className="w-12 h-12 mb-3 opacity-30" />
              <p className="text-[14px]">选择一个 Application 查看详情</p>
              <p className="text-[12px] mt-1">Git 仓库作为部署声明的单一事实来源</p>
            </div>
          ) : activeView === 'list' ? (
            <div className="space-y-4">
              {/* App header */}
              <div className="rounded-lg border p-4" style={{ background: 'var(--panel-bg)', borderColor: 'var(--border-color)' }}>
                <div className="flex items-center justify-between mb-3">
                  <div className="flex items-center gap-3">
                    <h2 className="text-[16px] font-semibold" style={{ color: 'var(--text-primary)' }}>{selectedApp.name}</h2>
                    <span className="text-[10px] px-2 py-[2px] rounded-full font-medium" style={{ background: statusConfig[selectedApp.status].bg, color: statusConfig[selectedApp.status].color }}>
                      {statusConfig[selectedApp.status].label}
                    </span>
                    <span className="text-[10px] px-2 py-[2px] rounded-full font-medium" style={{ background: healthConfig[selectedApp.health].bg || '#f6f8fa', color: healthConfig[selectedApp.health].color }}>
                      {healthConfig[selectedApp.health].label}
                    </span>
                  </div>
                  <div className="flex items-center gap-2">
                    <button onClick={() => syncMutation.mutate(selectedApp.name)}
                      disabled={syncMutation.isPending}
                      className="flex items-center gap-1 px-3 py-[5px] text-[12px] font-medium rounded-md text-white disabled:opacity-50" style={{ background: 'var(--accent-blue)' }}>
                      <RefreshCw className={`w-3.5 h-3.5 ${syncMutation.isPending ? 'animate-spin' : ''}`} />立即同步
                    </button>
                    <button onClick={() => toast.info('回滚', { description: '选择要回滚的版本' })}
                      className="px-3 py-[5px] text-[12px] font-medium rounded-md border" style={{ borderColor: 'var(--border-color-light)', color: 'var(--text-secondary)' }}>
                      回滚
                    </button>
                  </div>
                </div>
                <div className="grid grid-cols-4 gap-4 text-[12px]">
                  <div><div className="text-[11px] mb-1" style={{ color: 'var(--text-tertiary)' }}>Git 仓库</div><div className="font-mono" style={{ color: 'var(--text-primary)' }}>{selectedApp.repo}</div></div>
                  <div><div className="text-[11px] mb-1" style={{ color: 'var(--text-tertiary)' }}>分支 / 路径</div><div style={{ color: 'var(--text-primary)' }}>{selectedApp.branch} / {selectedApp.path}</div></div>
                  <div><div className="text-[11px] mb-1" style={{ color: 'var(--text-tertiary)' }}>目标集群</div><div className="flex items-center gap-1" style={{ color: 'var(--text-primary)' }}><Server className="w-3 h-3" />{selectedApp.cluster}</div></div>
                  <div><div className="text-[11px] mb-1" style={{ color: 'var(--text-tertiary)' }}>命名空间</div><div style={{ color: 'var(--text-primary)' }}>{selectedApp.namespace}</div></div>
                </div>
              </div>

              {/* Sync config */}
              <div className="rounded-lg border p-4" style={{ background: 'var(--panel-bg)', borderColor: 'var(--border-color)' }}>
                <h3 className="text-[13px] font-semibold mb-3" style={{ color: 'var(--text-primary)' }}>同步配置</h3>
                <div className="grid grid-cols-3 gap-4">
                  <div className="flex items-center gap-2">
                    <label className="flex items-center gap-2 text-[12px] cursor-pointer">
                      <input type="checkbox" checked={selectedApp.autoSync} readOnly className="w-4 h-4" style={{ accentColor: 'var(--accent-blue)' }} />
                      <span style={{ color: 'var(--text-primary)' }}>自动同步</span>
                    </label>
                  </div>
                  <div><label className="block text-[11px] mb-1" style={{ color: 'var(--text-tertiary)' }}>同步策略</label>
                    <select className="w-full px-2 py-[5px] text-[12px] rounded-md border" style={{ background: 'var(--panel-bg-secondary)', borderColor: 'var(--border-color-light)', color: 'var(--text-primary)' }}>
                      <option>自动（Git 变更触发）</option><option>手动（仅点击同步）</option><option>定时同步</option>
                    </select></div>
                  <div><label className="block text-[11px] mb-1" style={{ color: 'var(--text-tertiary)' }}>Prune 资源</label>
                    <select className="w-full px-2 py-[5px] text-[12px] rounded-md border" style={{ background: 'var(--panel-bg-secondary)', borderColor: 'var(--border-color-light)', color: 'var(--text-primary)' }}>
                      <option>自动清理已删除资源</option><option>保留所有资源</option>
                    </select></div>
                </div>
              </div>

              {/* Environment promotion */}
              <div className="rounded-lg border p-4" style={{ background: 'var(--panel-bg)', borderColor: 'var(--border-color)' }}>
                <h3 className="text-[13px] font-semibold mb-3" style={{ color: 'var(--text-primary)' }}>环境晋升</h3>
                <div className="flex items-center gap-3">
                  <div className="flex-1 rounded-md border p-3 text-center" style={{ background: 'var(--panel-bg-secondary)', borderColor: 'var(--border-color-light)' }}>
                    <div className="text-[11px] mb-1" style={{ color: 'var(--text-tertiary)' }}>开发环境</div>
                    <div className="text-[13px] font-medium" style={{ color: 'var(--text-primary)' }}>dev</div>
                    <div className="text-[10px] mt-1" style={{ color: '#1a7f37' }}>已同步</div>
                  </div>
                  <ChevronRight className="w-4 h-4" style={{ color: 'var(--text-tertiary)' }} />
                  <div className="flex-1 rounded-md border p-3 text-center" style={{ background: 'var(--panel-bg-secondary)', borderColor: 'var(--border-color-light)' }}>
                    <div className="text-[11px] mb-1" style={{ color: 'var(--text-tertiary)' }}>测试环境</div>
                    <div className="text-[13px] font-medium" style={{ color: 'var(--text-primary)' }}>staging</div>
                    <div className="text-[10px] mt-1" style={{ color: '#9a6700' }}>待同步</div>
                  </div>
                  <ChevronRight className="w-4 h-4" style={{ color: 'var(--text-tertiary)' }} />
                  <div className="flex-1 rounded-md border p-3 text-center" style={{ background: 'var(--panel-bg-secondary)', borderColor: 'var(--border-color-light)' }}>
                    <div className="text-[11px] mb-1" style={{ color: 'var(--text-tertiary)' }}>生产环境</div>
                    <div className="text-[13px] font-medium" style={{ color: 'var(--text-primary)' }}>production</div>
                    <div className="text-[10px] mt-1" style={{ color: '#1a7f37' }}>已同步</div>
                  </div>
                  <button onClick={() => toast.success('晋升', { description: '将 staging 版本晋升到 production' })}
                    className="px-3 py-[7px] text-[12px] font-medium rounded-md text-white" style={{ background: 'var(--accent-blue)' }}>
                    晋升
                  </button>
                </div>
              </div>
            </div>
          ) : activeView === 'tree' ? (
            <div className="rounded-lg border overflow-hidden" style={{ background: 'var(--panel-bg)', borderColor: 'var(--border-color)' }}>
              <div className="px-4 py-2 border-b flex items-center justify-between" style={{ borderColor: 'var(--border-color)' }}>
                <span className="text-[13px] font-semibold" style={{ color: 'var(--text-primary)' }}>资源树{selectedName ? ` · ${selectedName}` : ''}</span>
                <span className="text-[11px]" style={{ color: 'var(--text-tertiary)' }}>{resourceTree.length} 个顶级资源</span>
              </div>
              <div className="py-2">
                {treeLoading && <div className="py-6 text-center text-[12px]" style={{ color: 'var(--text-tertiary)' }}>加载中…</div>}
                {!treeLoading && resourceTree.map(node => renderResourceNode(node))}
              </div>
            </div>
          ) : (
            <div className="rounded-lg border p-4" style={{ background: 'var(--panel-bg)', borderColor: 'var(--border-color)' }}>
              <h3 className="text-[13px] font-semibold mb-3" style={{ color: 'var(--text-primary)' }}>Git vs 集群差异{selectedName ? ` · ${selectedName}` : ''}</h3>
              {diffLoading && <div className="py-6 text-center text-[12px]" style={{ color: 'var(--text-tertiary)' }}>加载中…</div>}
              <div className="space-y-2">
                {(diffData?.diffs || []).map((d: any, i: number) => (
                  <div key={i} className="rounded-md border overflow-hidden" style={{ borderColor: 'var(--border-color-light)' }}>
                    <div className="flex items-center gap-3 px-3 py-2" style={{ background: d.status === 'modified' ? '#fff8c5' : '#f6f8fa' }}>
                      <AlertTriangle className="w-4 h-4" style={{ color: d.status === 'modified' ? '#9a6700' : '#6e7781' }} />
                      <span className="text-[12px] font-medium" style={{ color: 'var(--text-primary)' }}>{d.kind}/{d.name}</span>
                      <span className="text-[10px] px-1.5 py-[1px] rounded" style={{ background: 'var(--panel-bg-secondary)', color: 'var(--text-tertiary)' }}>{d.namespace}</span>
                      <span className="text-[11px] ml-auto" style={{ color: d.status === 'modified' ? '#9a6700' : 'var(--text-tertiary)' }}>{d.status}</span>
                    </div>
                    <pre className="px-4 py-2 text-[11px] font-mono whitespace-pre-wrap" style={{ background: 'var(--panel-bg-secondary)', color: 'var(--text-secondary)' }}>{d.diff}</pre>
                  </div>
                ))}
                {!diffLoading && (diffData?.diffs || []).length === 0 && (
                  <div className="flex items-center gap-3 p-3 rounded-md" style={{ background: '#dafbe1' }}>
                    <CheckCircle2 className="w-4 h-4" style={{ color: '#1a7f37' }} />
                    <span className="text-[12px]" style={{ color: '#1a7f37' }}>Git 与集群一致，无差异</span>
                  </div>
                )}
              </div>
            </div>
          )}
        </div>
      </div>
    </div>
  );
}