import {Settings2} from 'lucide-react';
import {useState} from 'react';

import {Button} from '@/components/ui/button';
import {Checkbox} from '@/components/ui/checkbox';
import {Field, FieldDescription, FieldGroup, FieldLabel} from '@/components/ui/field';
import {Input} from '@/components/ui/input';
import {Popover, PopoverContent, PopoverTrigger} from '@/components/ui/popover';
import {ScrollArea} from '@/components/ui/scroll-area';
import {Select, SelectContent, SelectGroup, SelectItem, SelectTrigger, SelectValue} from '@/components/ui/select';
import {Separator} from '@/components/ui/separator';
import {Textarea} from '@/components/ui/textarea';
import type {WAFIPGroup, WAFRuleNode} from '@/lib/services/openflare';

const countries = ['CN', 'US', 'JP', 'SG', 'DE', 'FR', 'GB', 'CA', 'AU', 'BR', 'IN', 'KR'].map((value) => ({value, label: value}));
const regions = ['CN-BJ', 'CN-SH', 'CN-GD', 'CN-ZJ', 'US-CA', 'US-NY', 'US-TX', 'JP-13', 'DE-BE', 'GB-ENG'].map((value) => ({value, label: value}));

export function NodeProperties({node, ipGroups, onChange}: {node?: WAFRuleNode; ipGroups: WAFIPGroup[]; onChange: (node: WAFRuleNode) => void}) {
  return <aside className="w-80 shrink-0 border-l bg-card"><ScrollArea className="h-full"><div className="flex flex-col gap-5 p-5"><div className="flex items-center gap-2"><Settings2 className="size-5 text-primary"/><div><h2 className="text-sm font-semibold">节点属性</h2><p className="text-xs text-muted-foreground">配置当前处理单元</p></div></div><Separator />{!node ? <p className="text-sm text-muted-foreground">选择画布中的节点以查看配置。</p> : <PropertyFields node={node} ipGroups={ipGroups} onChange={onChange}/>}</div></ScrollArea></aside>;
}

function PropertyFields({node, ipGroups, onChange}: {node: WAFRuleNode; ipGroups: WAFIPGroup[]; onChange: (node: WAFRuleNode) => void}) {
  if (node.type === 'start' || node.type === 'allow') return <p className="text-sm text-muted-foreground">系统节点无需配置。</p>;
  if (node.type === 'ip_match') return <FieldGroup><CsvField id={`${node.id}-ips`} label="IP 地址" value={node.config.ips} onChange={(ips) => onChange({...node, config: {...node.config, ips}})}/><CsvField id={`${node.id}-cidrs`} label="CIDR 网段" value={node.config.cidrs} onChange={(cidrs) => onChange({...node, config: {...node.config, cidrs}})}/><MultiSelect id={`${node.id}-groups`} label="IP 组" options={ipGroups.map((group) => ({value: String(group.id), label: group.name}))} value={node.config.ip_group_ids.map(String)} onChange={(values) => onChange({...node, config: {...node.config, ip_group_ids: values.map(Number)}})}/></FieldGroup>;
  if (node.type === 'geo_match') return <FieldGroup><MultiSelect id={`${node.id}-countries`} label="国家代码" options={countries} value={node.config.countries} creatablePattern={/^[A-Z]{2}$/} onChange={(countries) => onChange({...node, config: {...node.config, countries}})}/><MultiSelect id={`${node.id}-regions`} label="地区代码" options={regions} value={node.config.regions} creatablePattern={/^[A-Z]{2}-[A-Z0-9]{1,3}$/} onChange={(regions) => onChange({...node, config: {...node.config, regions}})}/></FieldGroup>;
  if (node.type === 'pow') return <FieldGroup><Field><FieldLabel htmlFor={`${node.id}-algorithm`}>算法</FieldLabel><Select value={node.config.algorithm} onValueChange={(algorithm: 'fast' | 'slow') => onChange({...node, config: {...node.config, algorithm}})}><SelectTrigger id={`${node.id}-algorithm`} className="w-full"><SelectValue/></SelectTrigger><SelectContent><SelectGroup><SelectItem value="fast">快速</SelectItem><SelectItem value="slow">稳健</SelectItem></SelectGroup></SelectContent></Select></Field>{(['difficulty', 'session_ttl', 'challenge_ttl'] as const).map((key) => <NumberField id={`${node.id}-${key}`} key={key} min={{difficulty: 1, session_ttl: 60, challenge_ttl: 30}[key]} max={key === 'difficulty' ? 16 : undefined} label={{difficulty: '难度', session_ttl: '会话 TTL（秒）', challenge_ttl: '挑战 TTL（秒）'}[key]} value={node.config[key]} onChange={(value) => onChange({...node, config: {...node.config, [key]: value}})}/>)}</FieldGroup>;
  return <FieldGroup><NumberField id={`${node.id}-status`} min={400} max={599} label="HTTP 状态码" value={node.config.status_code} onChange={(status_code) => onChange({...node, config: {...node.config, status_code}})}/><Field><FieldLabel htmlFor={`${node.id}-body`}>HTML 响应体</FieldLabel><Textarea id={`${node.id}-body`} rows={9} value={node.config.response_body} onChange={(event) => onChange({...node, config: {...node.config, response_body: event.target.value}})}/><FieldDescription>{new TextEncoder().encode(node.config.response_body).length} / 16384 字节</FieldDescription></Field></FieldGroup>;
}

function CsvField({id, label, value, onChange}: {id: string; label: string; value: string[]; onChange: (value: string[]) => void}) { return <Field><FieldLabel htmlFor={id}>{label}</FieldLabel><Textarea id={id} value={value.join('\n')} onChange={(event) => onChange(event.target.value.split(/[\n,]/).map((item) => item.trim()).filter(Boolean))}/><FieldDescription>每行一个值</FieldDescription></Field>; }
function NumberField({id, label, value, min, max, onChange}: {id: string; label: string; value: number; min?: number; max?: number; onChange: (value: number) => void}) { return <Field><FieldLabel htmlFor={id}>{label}</FieldLabel><Input id={id} min={min} max={max} type="number" value={value} onChange={(event) => onChange(Number(event.target.value))}/></Field>; }

function MultiSelect({id, label, options, value, creatablePattern, onChange}: {id: string; label: string; options: {value: string; label: string}[]; value: string[]; creatablePattern?: RegExp; onChange: (value: string[]) => void}) {
  const [draft, setDraft] = useState('');
  const normalized = draft.trim().toUpperCase();
  const visible = [...options, ...value.filter((selected) => !options.some((option) => option.value === selected)).map((selected) => ({value: selected, label: selected}))];
  const canCreate = Boolean(creatablePattern?.test(normalized) && !value.includes(normalized));
  return <Field><FieldLabel htmlFor={id}>{label}</FieldLabel><Popover><PopoverTrigger asChild><Button id={id} variant="outline" className="w-full justify-start">{value.length ? `已选择 ${value.length} 项` : '请选择'}</Button></PopoverTrigger><PopoverContent align="start" className="flex max-h-64 flex-col gap-2 overflow-y-auto">{creatablePattern && <div className="flex gap-2"><Input aria-label={`新建${label}`} placeholder="输入代码并添加" value={draft} onChange={(event) => setDraft(event.target.value)}/><Button size="sm" disabled={!canCreate} onClick={() => { onChange([...value, normalized]); setDraft(''); }}>添加代码</Button></div>}{visible.length === 0 ? <p className="text-sm text-muted-foreground">暂无可选项</p> : visible.map((option) => <label key={option.value} className="flex cursor-pointer items-center gap-2 text-sm"><Checkbox checked={value.includes(option.value)} onCheckedChange={(checked) => onChange(checked ? [...value, option.value] : value.filter((item) => item !== option.value))}/><span>{option.label}</span><span className="ml-auto font-mono text-xs text-muted-foreground">{option.value}</span></label>)}</PopoverContent></Popover></Field>;
}