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';

import { countryOptions, regionOptions, type GeoOption } from './geo-options';

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 />
          <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={`${node.id}-groups`}
          label='IP 组'
          options={ipGroups.map((group) => ({
            value: String(group.id),
            label: group.name,
            searchText: `${group.name} ${group.id}`,
          }))}
          value={node.config.ip_group_ids.map(String)}
          onChange={(values) =>
            onChange({
              ...node,
              config: { ...node.config, ip_group_ids: values.map(Number) },
            })
          }
        />
      </FieldGroup>
    );
  if (node.type === 'geo_match')
    return (
      <FieldGroup>
        <MultiSelect
          id={`${node.id}-countries`}
          label='国家代码'
          description={`共 ${countryOptions.length} 个国家/地区，显示国家名与 ISO 代码`}
          options={countryOptions}
          value={node.config.countries}
          creatablePattern={/^[A-Z]{2}$/}
          onChange={(countries) =>
            onChange({ ...node, config: { ...node.config, countries } })
          }
        />
        <MultiSelect
          id={`${node.id}-regions`}
          label='地区代码'
          description={`共 ${regionOptions.length} 个一级行政区，输入名称或代码搜索`}
          options={regionOptions}
          value={node.config.regions}
          creatablePattern={/^[A-Z]{2}-[A-Z0-9]{1,3}$/}
          searchRequired
          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,
  description,
  options,
  value,
  creatablePattern,
  searchRequired = false,
  onChange,
}: {
  id: string;
  label: string;
  description?: string;
  options: GeoOption[];
  value: string[];
  creatablePattern?: RegExp;
  searchRequired?: boolean;
  onChange: (value: string[]) => void;
}) {
  const [draft, setDraft] = useState('');
  const normalized = draft.trim().toUpperCase();
  const query = draft.trim().toLocaleLowerCase();
  const available = [
    ...options,
    ...value
      .filter(
        (selected) => !options.some((option) => option.value === selected),
      )
      .map((selected) => ({
        value: selected,
        label: selected,
        searchText: selected,
      })),
  ];
  const visible = available.filter((option) => {
    if (!query) return !searchRequired || value.includes(option.value);
    return option.searchText.toLocaleLowerCase().includes(query);
  });
  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 ${value.length} 项` : '请选择'}
          </Button>
        </PopoverTrigger>
        <PopoverContent align='start' className='flex w-80 flex-col gap-2 p-3'>
          {(creatablePattern || options.length > 0) && (
            <div className='flex gap-2'>
              <Input
                aria-label={`新建${label}`}
                placeholder='搜索名称或代码'
                value={draft}
                onChange={(event) => setDraft(event.target.value)}
              />
              {creatablePattern && (
                <Button
                  size='sm'
                  disabled={!canCreate}
                  onClick={() => {
                    onChange([...value, normalized]);
                    setDraft('');
                  }}
                >
                  添加代码
                </Button>
              )}
            </div>
          )}
          <div className='max-h-56 space-y-1 overflow-y-auto pr-1'>
            {visible.length === 0 ? (
              <p className='px-1 py-3 text-sm text-muted-foreground'>
                {searchRequired && !query
                  ? `输入名称或代码搜索 ${options.length} 个选项`
                  : '没有匹配的选项'}
              </p>
            ) : (
              visible.map((option) => (
                <label
                  key={option.value}
                  className='flex min-h-8 cursor-pointer items-center gap-2 rounded-md px-1 text-sm hover:bg-accent'
                >
                  <Checkbox
                    checked={value.includes(option.value)}
                    onCheckedChange={(checked) =>
                      onChange(
                        checked
                          ? [...value, option.value]
                          : value.filter((item) => item !== option.value),
                      )
                    }
                  />
                  <span
                    className='min-w-0 flex-1 truncate'
                    title={option.label}
                  >
                    {option.label}
                  </span>
                  <span className='font-mono text-xs text-muted-foreground'>
                    {option.value}
                  </span>
                </label>
              ))
            )}
          </div>
        </PopoverContent>
      </Popover>
      {description && <FieldDescription>{description}</FieldDescription>}
    </Field>
  );
}