'use client';

import Link from 'next/link';
import { useRouter } from 'next/navigation';
import { zodResolver } from '@hookform/resolvers/zod';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { useEffect, useMemo, useState } from 'react';
import { useForm, useWatch } from 'react-hook-form';
import { z } from 'zod';

import { EmptyState } from '@/components/feedback/empty-state';
import { ErrorState } from '@/components/feedback/error-state';
import { InlineMessage } from '@/components/feedback/inline-message';
import { LoadingState } from '@/components/feedback/loading-state';
import { PageHeader } from '@/components/layout/page-header';
import { AppModal } from '@/components/ui/app-modal';
import { AppCard } from '@/components/ui/app-card';
import { StatusBadge } from '@/components/ui/status-badge';
import { getPublicStatus } from '@/features/auth/api/public';
import { getApplyLogs } from '@/features/apply-logs/api/apply-logs';
import {
  deleteNode,
  getNodes,
  requestNodeAgentUpdate,
  updateNode,
} from '@/features/nodes/api/nodes';
import type { NodeMutationPayload } from '@/features/nodes/types';
import {
  CodeBlock,
  DangerButton,
  PrimaryButton,
  ResourceField,
  ResourceInput,
  SecondaryButton,
  ToggleField,
} from '@/features/shared/components/resource-primitives';
import { formatDateTime, formatRelativeTime } from '@/lib/utils/date';
import {
  buildNodeInstallCommand,
  getApplyLabel,
  getApplyVariant,
  getNodeStatusLabel,
  getNodeStatusVariant,
  getServerUrl,
  getUpdateMode,
  isMeaningfulTime,
  shouldShowManualUpdate,
} from '@/features/nodes/utils';

const nodesQueryKey = ['nodes'];

const nodeSchema = z.object({
  name: z
    .string()
    .trim()
    .min(1, '请输入节点名')
    .max(128, '节点名不能超过 128 个字符'),
  auto_update_enabled: z.boolean(),
});

type NodeFormValues = z.infer<typeof nodeSchema>;

type FeedbackState = {
  tone: 'info' | 'success' | 'danger';
  message: string;
};

const defaultValues: NodeFormValues = {
  name: '',
  auto_update_enabled: false,
};

function getErrorMessage(error: unknown) {
  return error instanceof Error ? error.message : '请求失败，请稍后重试。';
}

function toPayload(values: NodeFormValues): NodeMutationPayload {
  return {
    name: values.name.trim(),
    auto_update_enabled: values.auto_update_enabled,
  };
}

async function copyToClipboard(value: string) {
  await navigator.clipboard.writeText(value);
}

export function NodeDetailPage({ nodeId }: { nodeId: string }) {
  const router = useRouter();
  const queryClient = useQueryClient();
  const [feedback, setFeedback] = useState<FeedbackState | null>(null);
  const [isEditorOpen, setIsEditorOpen] = useState(false);
  const [serverUrl, setServerUrl] = useState('');

  const form = useForm<NodeFormValues>({
    resolver: zodResolver(nodeSchema),
    defaultValues,
  });

  const watchedAutoUpdate = useWatch({
    control: form.control,
    name: 'auto_update_enabled',
  });

  const nodesQuery = useQuery({
    queryKey: nodesQueryKey,
    queryFn: getNodes,
    refetchInterval: 5000,
  });

  const publicStatusQuery = useQuery({
    queryKey: ['public-status'],
    queryFn: getPublicStatus,
  });

  const node = useMemo(() => {
    return (
      (nodesQuery.data ?? []).find((item) => String(item.id) === nodeId) ?? null
    );
  }, [nodeId, nodesQuery.data]);

  const applyLogsQuery = useQuery({
    queryKey: ['apply-logs', node?.node_id ?? ''],
    queryFn: () => getApplyLogs(node?.node_id),
    enabled: Boolean(node?.node_id),
    refetchInterval: 5000,
  });

  useEffect(() => {
    if (typeof window !== 'undefined' && !serverUrl) {
      setServerUrl(window.location.origin);
    }
  }, [serverUrl]);

  useEffect(() => {
    if (!node || isEditorOpen) {
      return;
    }

    form.reset({
      name: node.name,
      auto_update_enabled: node.auto_update_enabled,
    });
  }, [form, isEditorOpen, node]);

  const saveMutation = useMutation({
    mutationFn: async (values: NodeFormValues) =>
      updateNode(Number(nodeId), toPayload(values)),
    onSuccess: async (updatedNode) => {
      setFeedback({ tone: 'success', message: '节点已更新。' });
      setIsEditorOpen(false);
      form.reset({
        name: updatedNode.name,
        auto_update_enabled: updatedNode.auto_update_enabled,
      });
      await queryClient.invalidateQueries({ queryKey: nodesQueryKey });
    },
    onError: (error) => {
      setFeedback({ tone: 'danger', message: getErrorMessage(error) });
    },
  });

  const updateAgentMutation = useMutation({
    mutationFn: () => requestNodeAgentUpdate(Number(nodeId)),
    onSuccess: async (updatedNode) => {
      setFeedback({
        tone: 'success',
        message: `已向节点 ${updatedNode.name} 下发更新指令。`,
      });
      await queryClient.invalidateQueries({ queryKey: nodesQueryKey });
    },
    onError: (error) => {
      setFeedback({ tone: 'danger', message: getErrorMessage(error) });
    },
  });

  const deleteMutation = useMutation({
    mutationFn: () => deleteNode(Number(nodeId)),
    onSuccess: async () => {
      setFeedback({ tone: 'success', message: '节点已删除。' });
      await queryClient.invalidateQueries({ queryKey: nodesQueryKey });
      router.push('/node');
    },
    onError: (error) => {
      setFeedback({ tone: 'danger', message: getErrorMessage(error) });
    },
  });

  const handleSubmit = form.handleSubmit((values) => {
    setFeedback(null);
    saveMutation.mutate(values);
  });

  const handleDelete = () => {
    if (!node) {
      return;
    }

    if (
      !window.confirm(
        `确认删除节点“${node.name}”吗？删除后该节点需要重新创建并重新接入。`,
      )
    ) {
      return;
    }

    setFeedback(null);
    deleteMutation.mutate();
  };

  const handleCopy = async (value: string, message: string) => {
    try {
      await copyToClipboard(value);
      setFeedback({ tone: 'success', message });
    } catch (error) {
      setFeedback({ tone: 'danger', message: getErrorMessage(error) });
    }
  };

  if (nodesQuery.isLoading) {
    return <LoadingState />;
  }

  if (nodesQuery.isError) {
    return (
      <ErrorState
        title="节点详情加载失败"
        description={getErrorMessage(nodesQuery.error)}
      />
    );
  }

  if (!node) {
    return (
      <EmptyState
        title="节点不存在"
        description="该节点可能已被删除，或当前 ID 无法匹配到节点记录。"
      />
    );
  }

  const normalizedServerUrl = getServerUrl(serverUrl);
  const nodeInstallCommand =
    normalizedServerUrl && node.agent_token
      ? buildNodeInstallCommand(normalizedServerUrl, node.agent_token)
      : '';
  const updateMode = getUpdateMode(node);
  const serverVersion = publicStatusQuery.data?.version ?? '';
  const showManualUpdate = shouldShowManualUpdate(
    node.agent_version || '',
    serverVersion,
  );
  const applyLogs = applyLogsQuery.data ?? [];

  return (
    <>
      <div className="space-y-6">
        <PageHeader
          title={node.name}
          description="节点详情每 5 秒自动刷新一次。部署命令、Node ID、Token、更新模式和最近应用记录统一在这里查看。"
          action={
            <>
              <Link
                href="/node"
                className="inline-flex items-center justify-center rounded-2xl border border-[var(--border-default)] bg-[var(--control-background)] px-4 py-3 text-sm font-medium text-[var(--foreground-primary)] transition hover:bg-[var(--control-background-hover)]"
              >
                返回列表
              </Link>
              <SecondaryButton
                type="button"
                onClick={() => setIsEditorOpen(true)}
              >
                编辑节点
              </SecondaryButton>
              {showManualUpdate ? (
                <PrimaryButton
                  type="button"
                  onClick={() => updateAgentMutation.mutate()}
                  disabled={
                    updateAgentMutation.isPending || node.update_requested
                  }
                >
                  {node.update_requested ? '等待更新中...' : '手动升级 Agent'}
                </PrimaryButton>
              ) : null}
              <DangerButton
                type="button"
                onClick={handleDelete}
                disabled={deleteMutation.isPending}
              >
                删除节点
              </DangerButton>
            </>
          }
        />

        {feedback ? (
          <InlineMessage tone={feedback.tone} message={feedback.message} />
        ) : null}

        <div className="grid gap-4 xl:grid-cols-4">
          <AppCard title="连接状态">
            <div className="space-y-3">
              <StatusBadge
                label={getNodeStatusLabel(node.status)}
                variant={getNodeStatusVariant(node.status)}
              />
              <p className="text-sm text-[var(--foreground-secondary)]">
                最近心跳：
                {isMeaningfulTime(node.last_seen_at)
                  ? ` ${formatRelativeTime(
                      node.last_seen_at,
                    )} · ${formatDateTime(node.last_seen_at)}`
                  : ' 暂无'}
              </p>
            </div>
          </AppCard>

          <AppCard title="版本信息">
            <div className="space-y-2 text-sm text-[var(--foreground-secondary)]">
              <p>Agent：{node.agent_version || 'unknown'}</p>
              <p>Nginx：{node.nginx_version || 'unknown'}</p>
              <p>当前配置：{node.current_version || '未应用'}</p>
            </div>
          </AppCard>

          <AppCard title="更新模式">
            <div className="space-y-3">
              <StatusBadge
                label={updateMode.label}
                variant={updateMode.variant}
              />
              <p className="text-sm text-[var(--foreground-secondary)]">
                {node.update_requested
                  ? '已等待节点在下一次心跳后执行更新。'
                  : node.auto_update_enabled
                    ? '节点已启用自动更新。'
                    : '当前仅支持手动触发更新。'}
              </p>
            </div>
          </AppCard>

          <AppCard title="最近应用">
            <div className="space-y-3">
              <StatusBadge
                label={getApplyLabel(node.latest_apply_result)}
                variant={getApplyVariant(node.latest_apply_result)}
              />
              <p className="text-sm text-[var(--foreground-secondary)]">
                {isMeaningfulTime(node.latest_apply_at)
                  ? `${formatRelativeTime(
                      node.latest_apply_at,
                    )} · ${formatDateTime(node.latest_apply_at)}`
                  : '暂无应用记录'}
              </p>
            </div>
          </AppCard>
        </div>

        <div className="grid gap-6 xl:grid-cols-[1.1fr_0.9fr]">
          <AppCard
            title="节点标识与部署"
            description="Node ID、Token 与部署命令不再在列表中展示，统一收敛到详情页。"
            action={
              nodeInstallCommand ? (
                <PrimaryButton
                  type="button"
                  onClick={() =>
                    void handleCopy(
                      nodeInstallCommand,
                      '节点专属部署命令已复制。',
                    )
                  }
                >
                  复制部署命令
                </PrimaryButton>
              ) : null
            }
          >
            <div className="space-y-4">
              <div className="grid gap-4 md:grid-cols-2">
                <div className="rounded-2xl border border-[var(--border-default)] bg-[var(--surface-elevated)] px-4 py-4">
                  <p className="text-xs tracking-[0.2em] text-[var(--foreground-muted)] uppercase">
                    Node ID
                  </p>
                  <p className="mt-2 text-sm break-all text-[var(--foreground-primary)]">
                    {node.node_id}
                  </p>
                </div>
                <div className="rounded-2xl border border-[var(--border-default)] bg-[var(--surface-elevated)] px-4 py-4">
                  <p className="text-xs tracking-[0.2em] text-[var(--foreground-muted)] uppercase">
                    Agent Token
                  </p>
                  <p className="mt-2 text-sm break-all text-[var(--foreground-primary)]">
                    {node.agent_token || '暂无'}
                  </p>
                </div>
              </div>

              <ResourceField
                label="Server URL"
                hint="默认使用当前控制面来源地址，可按需改为外部访问地址。"
              >
                <ResourceInput
                  value={serverUrl}
                  onChange={(event) => setServerUrl(event.target.value)}
                />
              </ResourceField>

              {nodeInstallCommand ? (
                <CodeBlock className="whitespace-pre-wrap">
                  {nodeInstallCommand}
                </CodeBlock>
              ) : null}
            </div>
          </AppCard>

          <AppCard title="运行信息">
            <div className="space-y-4 text-sm text-[var(--foreground-secondary)]">
              <div>
                <p className="font-medium text-[var(--foreground-primary)]">
                  IP 地址
                </p>
                <p className="mt-1">{node.ip || '暂无'}</p>
              </div>
              <div>
                <p className="font-medium text-[var(--foreground-primary)]">
                  最近错误
                </p>
                <p className="mt-1 break-words whitespace-pre-wrap">
                  {node.last_error || '无'}
                </p>
              </div>
              <div>
                <p className="font-medium text-[var(--foreground-primary)]">
                  创建时间
                </p>
                <p className="mt-1">{formatDateTime(node.created_at)}</p>
              </div>
              <div>
                <p className="font-medium text-[var(--foreground-primary)]">
                  更新时间
                </p>
                <p className="mt-1">{formatDateTime(node.updated_at)}</p>
              </div>
            </div>
          </AppCard>
        </div>

        <AppCard
          title="最近应用记录"
          description="仅展示当前节点的应用历史。"
          action={
            <Link
              href={`/apply-log?node_id=${encodeURIComponent(node.node_id)}`}
              className="inline-flex items-center justify-center rounded-2xl border border-[var(--border-default)] bg-[var(--control-background)] px-4 py-3 text-sm font-medium text-[var(--foreground-primary)] transition hover:bg-[var(--control-background-hover)]"
            >
              查看完整记录
            </Link>
          }
        >
          {applyLogsQuery.isLoading ? (
            <LoadingState />
          ) : applyLogsQuery.isError ? (
            <ErrorState
              title="应用记录加载失败"
              description={getErrorMessage(applyLogsQuery.error)}
            />
          ) : applyLogs.length === 0 ? (
            <EmptyState
              title="暂无应用记录"
              description="当前节点还没有上报过配置应用结果。"
            />
          ) : (
            <div className="overflow-x-auto">
              <table className="min-w-full divide-y divide-[var(--border-default)] text-left text-sm">
                <thead>
                  <tr className="text-[var(--foreground-secondary)]">
                    <th className="px-3 py-3 font-medium">版本</th>
                    <th className="px-3 py-3 font-medium">结果</th>
                    <th className="px-3 py-3 font-medium">时间</th>
                    <th className="px-3 py-3 font-medium">消息</th>
                  </tr>
                </thead>
                <tbody className="divide-y divide-[var(--border-default)]">
                  {applyLogs.slice(0, 10).map((log) => (
                    <tr key={log.id} className="align-top">
                      <td className="px-3 py-4 text-[var(--foreground-primary)]">
                        {log.version}
                      </td>
                      <td className="px-3 py-4">
                        <StatusBadge
                          label={log.result === 'success' ? '成功' : '失败'}
                          variant={
                            log.result === 'success' ? 'success' : 'danger'
                          }
                        />
                      </td>
                      <td className="px-3 py-4 text-[var(--foreground-secondary)]">
                        {formatRelativeTime(log.created_at)} ·{' '}
                        {formatDateTime(log.created_at)}
                      </td>
                      <td className="px-3 py-4 text-[var(--foreground-secondary)]">
                        <p className="max-w-80 break-words whitespace-pre-wrap">
                          {log.message || '—'}
                        </p>
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          )}
        </AppCard>
      </div>

      <AppModal
        isOpen={isEditorOpen}
        onClose={() => setIsEditorOpen(false)}
        title="编辑节点"
        description="更新模式和节点名都在详情页维护。"
        footer={
          <div className="flex flex-wrap justify-end gap-3">
            <SecondaryButton
              type="button"
              onClick={() => setIsEditorOpen(false)}
              disabled={saveMutation.isPending}
            >
              取消
            </SecondaryButton>
            <PrimaryButton
              type="submit"
              form="node-detail-editor-form"
              disabled={saveMutation.isPending}
            >
              {saveMutation.isPending ? '保存中...' : '保存修改'}
            </PrimaryButton>
          </div>
        }
      >
        <form
          id="node-detail-editor-form"
          className="space-y-5"
          onSubmit={handleSubmit}
        >
          <ResourceField
            label="节点名"
            hint="示例：shanghai-edge-1"
            error={form.formState.errors.name?.message}
          >
            <ResourceInput
              placeholder="shanghai-edge-1"
              {...form.register('name')}
            />
          </ResourceField>

          <ToggleField
            label="启用自动更新"
            description="开启后 Agent 心跳返回会提示节点自动执行自更新。"
            checked={watchedAutoUpdate}
            onChange={(checked) =>
              form.setValue('auto_update_enabled', checked, {
                shouldDirty: true,
                shouldValidate: true,
              })
            }
          />
        </form>
      </AppModal>
    </>
  );
}