// 告警集合通知策略 — 四类监控绑定联系组 + 消息模版 // Logan.Li
import { useState, useEffect, useCallback, useMemo } from 'react';
import { Server, Database, Globe, Network, Bell, Zap, Loader2, Save, FileText } from 'lucide-react';
import { SilenceRulesPanel } from './SilenceRulesPanel';
import { toast } from 'sonner';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Switch } from '@/components/ui/switch';
import { Label } from '@/components/ui/label';
import { Input } from '@/components/ui/input';
import {
  Select, SelectContent, SelectItem, SelectTrigger, SelectValue,
} from '@/components/ui/select';
import { PageLoading } from '@/components/layout/PageLoading';
import { alertApi } from '@/api';
import type { Contact, ContactGroup } from './alert-center-helpers';

export interface NotifyPolicy {
  id: number;
  category: 'host' | 'middleware' | 'site' | 'snmp';
  label?: string;
  enabled: boolean;
  contact_group_ids?: string;
  contact_ids?: string;
  notify_mode?: string;
  description?: string;
}

import type { NotifyMessageSettings } from '@/api/monitor/alert';

type PolicyDraft = { enabled: boolean; groupIds: number[]; contactIds: number[] };

const CATEGORIES = [
  { id: 'host' as const, label: '主机监控', desc: 'Agent 采集 CPU/内存/磁盘/离线等', icon: Server },
  { id: 'middleware' as const, label: '中间件监控', desc: 'Redis/MySQL 等指标告警', icon: Database },
  { id: 'site' as const, label: '站点拨测', desc: 'HTTP/TCP/DNS 拨测失败与延迟', icon: Globe },
  { id: 'snmp' as const, label: 'SNMP 监控', desc: 'H3C/华为/Cisco/锐捷/Dell/浪潮', icon: Network },
];

const DEFAULT_TITLE = '[{{severity_label}}] {{rule_name}} — {{hostname}} ({{metric}})';
const DEFAULT_FOOTER = '{{time}} ｜ {{platform}}';
const DEFAULT_PLATFORM = 'AIOps 智能运维平台';

const TEMPLATE_VARS = [
  '{{time}}', '{{platform}}', '{{rule_name}}', '{{hostname}}',
  '{{metric}}', '{{severity}}', '{{severity_label}}',
];

function parseIDs(raw?: string): number[] {
  if (!raw || raw === 'null') return [];
  try {
    const arr = JSON.parse(raw);
    return Array.isArray(arr) ? arr.map(Number).filter(n => !isNaN(n)) : [];
  } catch {
    return [];
  }
}

function draftKey(d: PolicyDraft) {
  return `${d.enabled}|${d.groupIds.join(',')}|${d.contactIds.join(',')}`;
}

export function NotifyPolicyTab() {
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [testing, setTesting] = useState<string | null>(null);
  const [testCategory, setTestCategory] = useState('host');

  const [contacts, setContacts] = useState<Contact[]>([]);
  const [groups, setGroups] = useState<ContactGroup[]>([]);
  const [drafts, setDrafts] = useState<Record<string, PolicyDraft>>({});
  const [savedDraftKeys, setSavedDraftKeys] = useState<Record<string, string>>({});
  const [msgSettings, setMsgSettings] = useState<NotifyMessageSettings>({
    title_template: DEFAULT_TITLE,
    footer_template: DEFAULT_FOOTER,
    platform_name: DEFAULT_PLATFORM,
  });
  const [savedMsgSettings, setSavedMsgSettings] = useState<NotifyMessageSettings>({
    title_template: DEFAULT_TITLE,
    footer_template: DEFAULT_FOOTER,
    platform_name: DEFAULT_PLATFORM,
  });

  const load = useCallback(async () => {
    setLoading(true);
    try {
      const [policyRes, contactRes, groupRes, msgRes] = await Promise.all([
        alertApi.getNotifyPolicies(),
        alertApi.getContacts(),
        alertApi.getContactGroups(),
        alertApi.getNotifyMessageSettings(),
      ]);
      const list = (policyRes as { list?: NotifyPolicy[] })?.list || [];
      setContacts((contactRes as { list?: Contact[] })?.list || []);
      setGroups((groupRes as { list?: ContactGroup[] })?.list || []);

      const next: Record<string, PolicyDraft> = {};
      const keys: Record<string, string> = {};
      for (const p of list) {
        const d = {
          enabled: p.enabled,
          groupIds: parseIDs(p.contact_group_ids),
          contactIds: parseIDs(p.contact_ids),
        };
        next[p.category] = d;
        keys[p.category] = draftKey(d);
      }
      for (const c of CATEGORIES) {
        if (!next[c.id]) {
          const d = { enabled: false, groupIds: [], contactIds: [] };
          next[c.id] = d;
          keys[c.id] = draftKey(d);
        }
      }
      setDrafts(next);
      setSavedDraftKeys(keys);

      const msg = (msgRes || {}) as NotifyMessageSettings;
      const merged = {
        title_template: msg.title_template || DEFAULT_TITLE,
        footer_template: msg.footer_template || DEFAULT_FOOTER,
        platform_name: msg.platform_name || DEFAULT_PLATFORM,
      };
      setMsgSettings(merged);
      setSavedMsgSettings(merged);
    } catch {
      toast.error('加载通知策略失败');
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => { load(); }, [load]);

  const policiesDirty = useMemo(() =>
    CATEGORIES.some(c => draftKey(drafts[c.id] || { enabled: false, groupIds: [], contactIds: [] }) !== savedDraftKeys[c.id]),
  [drafts, savedDraftKeys]);

  const templateDirty = useMemo(() =>
    msgSettings.title_template !== savedMsgSettings.title_template
    || msgSettings.footer_template !== savedMsgSettings.footer_template
    || msgSettings.platform_name !== savedMsgSettings.platform_name,
  [msgSettings, savedMsgSettings]);

  const isDirty = policiesDirty || templateDirty;

  const footerPreview = useMemo(() => {
    const now = new Date().toLocaleString('zh-CN', { hour12: false }).replace(/\//g, '-');
    return (msgSettings.footer_template || DEFAULT_FOOTER)
      .replace('{{time}}', now)
      .replace('{{platform}}', msgSettings.platform_name || DEFAULT_PLATFORM);
  }, [msgSettings]);

  const toggleGroup = (cat: string, gid: number) => {
    setDrafts(prev => {
      const d = prev[cat] || { enabled: false, groupIds: [], contactIds: [] };
      const groupIds = d.groupIds.includes(gid) ? d.groupIds.filter(id => id !== gid) : [...d.groupIds, gid];
      return { ...prev, [cat]: { ...d, groupIds } };
    });
  };

  const toggleContact = (cat: string, cid: number) => {
    setDrafts(prev => {
      const d = prev[cat] || { enabled: false, groupIds: [], contactIds: [] };
      const contactIds = d.contactIds.includes(cid) ? d.contactIds.filter(id => id !== cid) : [...d.contactIds, cid];
      return { ...prev, [cat]: { ...d, contactIds } };
    });
  };

  const handleSaveAll = async () => {
    setSaving(true);
    try {
      await Promise.all([
        ...CATEGORIES.map(c => {
          const d = drafts[c.id];
          if (!d) return Promise.resolve();
          return alertApi.upsertNotifyPolicy(c.id, {
            enabled: d.enabled,
            contact_group_ids: d.groupIds,
            contact_ids: d.contactIds,
          });
        }),
        alertApi.saveNotifyMessageSettings(msgSettings),
      ]);
      toast.success('通知配置已保存');
      load();
    } catch (e) {
      toast.error((e as { message?: string }).message || '保存失败');
    } finally {
      setSaving(false);
    }
  };

  const handleTest = async (category: string) => {
    setTesting(category);
    try {
      await alertApi.testNotifyPolicy(category);
      toast.success('测试通知已发送');
    } catch (e) {
      toast.error((e as { message?: string }).message || '测试失败，请检查策略与联系人');
    } finally {
      setTesting(null);
    }
  };

  if (loading) return <PageLoading label="加载通知策略..." />;

  return (
    <div className="space-y-4">
      {/* 顶栏：说明 + 统一保存 / 测试 */}
      <div className="flex flex-wrap items-center justify-between gap-3">
        <p className="text-xs text-[var(--dg-text-secondary)] max-w-xl">
          按监控类型配置默认通知对象；消息模版作用于飞书卡片标题与底部署名。
        </p>
        <div className="flex flex-wrap items-center gap-2">
          <Select value={testCategory} onValueChange={setTestCategory}>
            <SelectTrigger className="h-8 w-[7.5rem] text-xs dg-input">
              <SelectValue />
            </SelectTrigger>
            <SelectContent className="dg-input">
              {CATEGORIES.map(c => (
                <SelectItem key={c.id} value={c.id} className="text-xs">{c.label}</SelectItem>
              ))}
            </SelectContent>
          </Select>
          <Button
            size="sm"
            variant="outline"
            className="h-8 text-xs"
            disabled={testing !== null || !drafts[testCategory]?.enabled}
            onClick={() => handleTest(testCategory)}
          >
            {testing ? <Loader2 className="h-3 w-3 animate-spin mr-1" /> : <Zap className="h-3 w-3 mr-1" />}
            测试
          </Button>
          <Button
            size="sm"
            className="h-8 text-xs dg-btn-primary"
            disabled={saving || !isDirty}
            onClick={handleSaveAll}
          >
            {saving ? <Loader2 className="h-3 w-3 animate-spin mr-1" /> : <Save className="h-3 w-3 mr-1" />}
            保存全部
          </Button>
        </div>
      </div>

      {groups.length === 0 && contacts.length === 0 && (
        <div className="text-xs text-amber-500 bg-amber-500/10 border border-amber-500/20 rounded-md px-3 py-2">
          请先在「报警联系人」和「报警联系组」中创建通知对象。
        </div>
      )}

      {/* 消息模版 */}
      <Card className="border-[var(--dg-border)] bg-[var(--dg-bg-secondary)]">
        <CardHeader className="pb-2">
          <CardTitle className="text-sm flex items-center gap-2">
            <FileText className="h-4 w-4 text-[var(--dg-blue)]" />
            消息通知模版
          </CardTitle>
        </CardHeader>
        <CardContent className="space-y-3">
          <div className="grid gap-3 md:grid-cols-2">
            <div className="space-y-1.5">
              <Label className="text-xs text-[var(--dg-text-secondary)]">标题模版</Label>
              <Input
                className="dg-input text-xs"
                value={msgSettings.title_template}
                onChange={e => setMsgSettings(s => ({ ...s, title_template: e.target.value }))}
                placeholder={DEFAULT_TITLE}
              />
            </div>
            <div className="space-y-1.5">
              <Label className="text-xs text-[var(--dg-text-secondary)]">平台署名</Label>
              <Input
                className="dg-input text-xs"
                value={msgSettings.platform_name}
                onChange={e => setMsgSettings(s => ({ ...s, platform_name: e.target.value }))}
                placeholder={DEFAULT_PLATFORM}
              />
            </div>
          </div>
          <div className="space-y-1.5">
            <Label className="text-xs text-[var(--dg-text-secondary)]">卡片底部</Label>
            <Input
              className="dg-input text-xs"
              value={msgSettings.footer_template}
              onChange={e => setMsgSettings(s => ({ ...s, footer_template: e.target.value }))}
              placeholder={DEFAULT_FOOTER}
            />
            <p className="text-[10px] text-[var(--dg-text-muted)]">
              预览：{footerPreview}
            </p>
          </div>
          <div className="flex flex-wrap gap-1.5">
            {TEMPLATE_VARS.map(v => (
              <Badge key={v} variant="outline" className="text-[10px] font-mono">{v}</Badge>
            ))}
          </div>
        </CardContent>
      </Card>

      {/* 四类通知策略 */}
      <div className="grid gap-4 md:grid-cols-2">
        {CATEGORIES.map(cat => {
          const Icon = cat.icon;
          const d = drafts[cat.id] || { enabled: false, groupIds: [], contactIds: [] };
          const memberCount = d.groupIds.length + d.contactIds.length;
          const catDirty = draftKey(d) !== savedDraftKeys[cat.id];
          return (
            <Card key={cat.id} className={`border-[var(--dg-border)] bg-[var(--dg-bg-secondary)] ${catDirty ? 'ring-1 ring-[var(--dg-orange)]/40' : ''}`}>
              <CardHeader className="pb-2">
                <div className="flex items-start justify-between gap-2">
                  <div className="flex items-center gap-2">
                    <div className="p-1.5 rounded-md bg-primary/10">
                      <Icon className="h-4 w-4 text-primary" />
                    </div>
                    <div>
                      <CardTitle className="text-sm flex items-center gap-2">
                        {cat.label}
                        {catDirty && <span className="text-[10px] text-[var(--dg-orange)]">未保存</span>}
                      </CardTitle>
                      <p className="text-[10px] text-[var(--dg-text-muted)] mt-0.5">{cat.desc}</p>
                    </div>
                  </div>
                  <div className="flex items-center gap-2 shrink-0">
                    <Switch
                      checked={d.enabled}
                      onCheckedChange={v => setDrafts(prev => ({
                        ...prev,
                        [cat.id]: { ...d, enabled: v },
                      }))}
                    />
                    <Label className="text-xs text-[var(--dg-text-secondary)] min-w-[2rem]">
                      {d.enabled ? '启用' : '停用'}
                    </Label>
                  </div>
                </div>
              </CardHeader>
              <CardContent className="space-y-3">
                <div>
                  <Label className="text-xs text-[var(--dg-text-secondary)]">通知联系组</Label>
                  {groups.length === 0 ? (
                    <p className="text-[10px] text-[var(--dg-text-muted)] mt-1">暂无联系组</p>
                  ) : (
                    <div className="flex flex-wrap gap-1.5 mt-1.5">
                      {groups.map(g => (
                        <Button
                          key={g.id}
                          type="button"
                          size="sm"
                          variant={d.groupIds.includes(g.id) ? 'default' : 'outline'}
                          className="h-7 text-xs"
                          onClick={() => toggleGroup(cat.id, g.id)}
                        >
                          {g.group_name}
                        </Button>
                      ))}
                    </div>
                  )}
                </div>
                <div>
                  <Label className="text-xs text-[var(--dg-text-secondary)]">额外联系人</Label>
                  {contacts.length === 0 ? (
                    <p className="text-[10px] text-[var(--dg-text-muted)] mt-1">暂无联系人</p>
                  ) : (
                    <div className="flex flex-wrap gap-1.5 mt-1.5">
                      {contacts.map(c => (
                        <Button
                          key={c.id}
                          type="button"
                          size="sm"
                          variant={d.contactIds.includes(c.id) ? 'default' : 'outline'}
                          className="h-7 text-xs"
                          onClick={() => toggleContact(cat.id, c.id)}
                        >
                          {c.name}
                        </Button>
                      ))}
                    </div>
                  )}
                </div>
                {memberCount > 0 && (
                  <Badge variant="outline" className="text-[10px]">
                    已选 {d.groupIds.length} 组 + {d.contactIds.length} 人
                  </Badge>
                )}
              </CardContent>
            </Card>
          );
        })}
      </div>

      <div className="flex items-center gap-2 text-[10px] text-[var(--dg-text-muted)]">
        <Bell className="h-3 w-3" />
        未配置策略时将回退到「通知渠道」中的全局飞书渠道。
      </div>

      <SilenceRulesPanel />
    </div>
  );
}