import { useState } from 'react';
import { Pressable, Text, TextInput, View } from 'react-native';
import { toast } from 'sonner-native';
import { BottomSheet } from '@/components/BottomSheet';
import { useAddMembers } from '@/hooks/use-member-management';
import { toUserMessage } from '@/lib/errors';
import { cn } from '@/lib/utils';

interface AddMembersSheetProps {
  open: boolean;
  onClose: () => void;
  networkId: string;
}

const EMAIL_RE = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

/**
 * Invite people to a network by email. Mirrors desktop's add-members-dialog —
 * accepts one email at a time (comma/space/enter to commit), shows chips, and
 * submits the batch via `addMembers`.
 */
export function AddMembersSheet({
  open,
  onClose,
  networkId,
}: AddMembersSheetProps) {
  const [draft, setDraft] = useState('');
  const [emails, setEmails] = useState<string[]>([]);
  const addMembers = useAddMembers(networkId);

  const [prevOpen, setPrevOpen] = useState(open);
  if (open !== prevOpen) {
    setPrevOpen(open);
    if (open) {
      setDraft('');
      setEmails([]);
    }
  }

  const commitDraft = (): string[] => {
    const candidate = draft.trim().toLowerCase().replace(/,$/, '');
    if (!candidate) return emails;
    if (!EMAIL_RE.test(candidate)) {
      toast.error('Enter a valid email address');
      return emails;
    }
    if (emails.includes(candidate)) {
      setDraft('');
      return emails;
    }
    const next = [...emails, candidate];
    setEmails(next);
    setDraft('');
    return next;
  };

  const removeEmail = (email: string) =>
    setEmails((prev) => prev.filter((e) => e !== email));

  const handleSubmit = async () => {
    const finalEmails = commitDraft();
    if (finalEmails.length === 0) return;
    try {
      await addMembers.mutateAsync(finalEmails);
      toast.success(
        finalEmails.length === 1
          ? 'Invitation sent'
          : `${finalEmails.length} invitations sent`,
      );
      onClose();
    } catch (err) {
      toast.error(toUserMessage(err));
    }
  };

  const canSubmit =
    !addMembers.isPending &&
    (emails.length > 0 || EMAIL_RE.test(draft.trim().toLowerCase()));

  return (
    <BottomSheet open={open} onClose={onClose} avoidKeyboard maxHeight="60%">
      <View className="px-5 pb-4">
        <Text className="text-white text-lg font-semibold">Add members</Text>
        <Text className="text-white/50 text-sm mt-1">
          Existing users join right away; others get an email invite.
        </Text>

        {emails.length > 0 ? (
          <View className="flex-row flex-wrap gap-2 mt-4">
            {emails.map((email) => (
              <Pressable
                key={email}
                onPress={() => removeEmail(email)}
                className="flex-row items-center bg-white/10 rounded-full pl-3 pr-2 py-1"
              >
                <Text className="text-white text-sm">{email}</Text>
                <Text className="text-white/50 text-base ml-1">×</Text>
              </Pressable>
            ))}
          </View>
        ) : null}

        <TextInput
          value={draft}
          onChangeText={(text) => {
            if (text.endsWith(',') || text.endsWith(' ')) {
              setDraft(text);
              commitDraft();
            } else {
              setDraft(text);
            }
          }}
          placeholder="name@example.com"
          placeholderTextColor="rgba(255,255,255,0.4)"
          autoFocus
          autoCapitalize="none"
          autoCorrect={false}
          keyboardType="email-address"
          returnKeyType="done"
          onSubmitEditing={() => commitDraft()}
          editable={!addMembers.isPending}
          className="text-white text-base bg-white/10 rounded-xl px-4 py-3 mt-4"
        />

        <Pressable
          onPress={handleSubmit}
          disabled={!canSubmit}
          className={cn(
            'mt-4 rounded-xl py-3 items-center',
            canSubmit ? 'bg-white' : 'bg-white/20',
          )}
        >
          <Text
            className={cn(
              'text-base font-semibold',
              canSubmit ? 'text-black' : 'text-white/40',
            )}
          >
            {addMembers.isPending ? 'Sending…' : 'Send invites'}
          </Text>
        </Pressable>
      </View>
    </BottomSheet>
  );
}