'use client';

import { useEffect, useState } from 'react';
import { Button } from '@/components/ui/button';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Switch } from '@/components/ui/switch';
import { useAdminUsers } from '@/contexts/admin-users-context';
import type { CreateUserRequest } from '@/lib/services/admin';

const emptyForm: CreateUserRequest = {
  username: '',
  password: '',
  nickname: '',
  email: '',
  is_active: true,
  is_admin: false,
};

export function CreateUserModal({
  isOpen,
  onClose,
}: {
  isOpen: boolean;
  onClose: () => void;
}) {
  const { createUser } = useAdminUsers();
  const [form, setForm] = useState<CreateUserRequest>(emptyForm);
  const [saving, setSaving] = useState(false);
  const [errors, setErrors] = useState<Record<string, string>>({});

  useEffect(() => {
    if (isOpen) {
      setForm(emptyForm);
      setErrors({});
    } else {
      setSaving(false);
    }
  }, [isOpen]);

  const validate = () => {
    const newErrors: Record<string, string> = {};
    if (!form.username.trim()) {
      newErrors.username = '用户名不能为空';
    } else if (form.username.trim().length < 3) {
      newErrors.username = '用户名长度不能少于 3 位';
    }

    if (!form.email.trim()) {
      newErrors.email = '邮箱不能为空';
    } else if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(form.email.trim())) {
      newErrors.email = '邮箱格式不正确';
    }

    if (!form.password) {
      newErrors.password = '密码不能为空';
    } else if (form.password.length < 8) {
      newErrors.password = '密码长度不能少于 8 位';
    }

    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };

  const handleSave = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!validate()) return;

    setSaving(true);
    try {
      await createUser({
        ...form,
        username: form.username.trim(),
        nickname: form.nickname?.trim() || undefined,
        email: form.email.trim(),
      });
      onClose();
    } catch {
      // Errors are already handled by context toast notifications
    } finally {
      setSaving(false);
    }
  };

  return (
    <Dialog open={isOpen} onOpenChange={(open) => !open && onClose()}>
      <DialogContent className='max-w-md'>
        <DialogHeader>
          <DialogTitle>新增用户</DialogTitle>
          <DialogDescription>
            直接创建一个本地密码登录的新账户。
          </DialogDescription>
        </DialogHeader>

        <form onSubmit={handleSave} className='space-y-4 pt-2'>
          <div className='space-y-1.5'>
            <Label htmlFor='username'>用户名</Label>
            <Input
              id='username'
              value={form.username}
              onChange={(e) =>
                setForm((prev) => ({ ...prev, username: e.target.value }))
              }
              placeholder='请输入用户名 (至少 3 位)'
            />
            {errors.username && (
              <p className='text-xs text-destructive'>{errors.username}</p>
            )}
          </div>

          <div className='space-y-1.5'>
            <Label htmlFor='nickname'>昵称 (选填)</Label>
            <Input
              id='nickname'
              value={form.nickname}
              onChange={(e) =>
                setForm((prev) => ({ ...prev, nickname: e.target.value }))
              }
              placeholder='请输入昵称'
            />
          </div>

          <div className='space-y-1.5'>
            <Label htmlFor='email'>邮箱</Label>
            <Input
              id='email'
              type='email'
              value={form.email}
              onChange={(e) =>
                setForm((prev) => ({ ...prev, email: e.target.value }))
              }
              placeholder='请输入邮箱地址'
            />
            {errors.email && (
              <p className='text-xs text-destructive'>{errors.email}</p>
            )}
          </div>

          <div className='space-y-1.5'>
            <Label htmlFor='password'>密码</Label>
            <Input
              id='password'
              type='password'
              value={form.password}
              onChange={(e) =>
                setForm((prev) => ({ ...prev, password: e.target.value }))
              }
              placeholder='请输入登录密码 (至少 8 位)'
            />
            {errors.password && (
              <p className='text-xs text-destructive'>{errors.password}</p>
            )}
          </div>

          <div className='flex items-center justify-between rounded-lg border border-dashed p-3 bg-muted/10'>
            <div>
              <div className='font-medium text-sm'>启用账户</div>
              <div className='text-xs text-muted-foreground'>
                禁用后此账号将无法登录系统。
              </div>
            </div>
            <Switch
              checked={form.is_active}
              onCheckedChange={(checked) =>
                setForm((prev) => ({ ...prev, is_active: checked }))
              }
            />
          </div>

          <div className='flex items-center justify-between rounded-lg border border-dashed p-3 bg-muted/10'>
            <div>
              <div className='font-medium text-sm'>管理员权限</div>
              <div className='text-xs text-muted-foreground'>
                开启后此账号将拥有后台管理权限。
              </div>
            </div>
            <Switch
              checked={form.is_admin}
              onCheckedChange={(checked) =>
                setForm((prev) => ({ ...prev, is_admin: checked }))
              }
            />
          </div>

          <div className='flex justify-end gap-2 pt-2 border-t mt-2'>
            <Button variant='outline' type='button' onClick={onClose}>
              取消
            </Button>
            <Button type='submit' disabled={saving} variant='secondary'>
              {saving ? '创建中...' : '创建'}
            </Button>
          </div>
        </form>
      </DialogContent>
    </Dialog>
  );
}