import { useCallback, useRef } from 'react';
import merge from 'lodash/merge.js';
import set from 'lodash/set.js';
import { useResourceContext } from '../../core';
import { useDataProvider } from '../../dataProvider';
import { useTranslate, useTranslateLabel } from '../../i18n';
import { asyncDebounce } from '../../util';
import { useRecordContext } from '../../controller';
import { InputProps } from '../useInput';
import { isEmpty } from './validate';

/**
 * A hook that returns a validation function checking for a record field uniqueness
 * by calling the dataProvider getList function with a filter.
 *
 * @example // Passing options at declaration time
 * const UserCreateForm = () => {
 *     const unique = useUnique({ message: 'Username is already used'});
 *     return (
 *         <SimpleForm>
 *             <TextInput source="username" validate={unique()} />
 *         </SimpleForm>
 *     );
 * }
 *
 * @example // Passing options at call time
 * const UserCreateForm = () => {
 *     const unique = useUnique();
 *     return (
 *         <SimpleForm>
 *             <TextInput source="username" validate={unique({ message: 'Username is already used'})} />
 *         </SimpleForm>
 *     );
 * }
 *
 * @example // With additional filters
 * const UserCreateForm = () => {
 *     const unique = useUnique();
 *     return (
 *         <SimpleForm>
 *             <ReferenceInput source="organization_id" reference="organizations" />
 *             <FormDataConsumer>
 *                 {({ formData }) => (
 *                     <TextInput
 *                         source="username"
 *                         validate={unique({ filter: { organization_id: formData.organization_id })}
 *                     />
 *                 )}
 *             </FormDataConsumer>
 *         </SimpleForm>
 *     );
 * }
 */
export const useUnique = (options?: UseUniqueOptions) => {
    const dataProvider = useDataProvider();
    const translateLabel = useTranslateLabel();
    const resource = useResourceContext(options);
    if (!resource) {
        throw new Error('useUnique: missing resource prop or context');
    }
    const translate = useTranslate();
    const record = useRecordContext();

    const debouncedGetList = useRef(
        // The initial value is here to set the correct type on useRef
        asyncDebounce(
            dataProvider.getList,
            options?.debounce ?? DEFAULT_DEBOUNCE
        )
    );

    const validateUnique = useCallback(
        (callTimeOptions?: UseUniqueOptions) => {
            const {
                message,
                filter,
                debounce: interval,
            } = merge<UseUniqueOptions, any, any>(
                {
                    debounce: DEFAULT_DEBOUNCE,
                    filter: {},
                    message: 'ra.validation.unique',
                },
                options,
                callTimeOptions
            );

            debouncedGetList.current = asyncDebounce(
                dataProvider.getList,
                interval
            );

            return async (value: any, allValues: any, props: InputProps) => {
                if (isEmpty(value)) {
                    return undefined;
                }
                try {
                    const finalFilter = set(
                        merge({}, filter),
                        props.source,
                        value
                    );
                    const { data, total } = await debouncedGetList.current(
                        resource,
                        {
                            filter: finalFilter,
                            pagination: { page: 1, perPage: 1 },
                            sort: { field: 'id', order: 'ASC' },
                        }
                    );

                    if (
                        typeof total !== 'undefined' &&
                        total > 0 &&
                        !data.some(r => r.id === record?.id)
                    ) {
                        return {
                            message,
                            args: {
                                source: props.source,
                                value,
                                field: translateLabel({
                                    label: props.label,
                                    source: props.source,
                                    resource,
                                }),
                            },
                        };
                    }
                } catch (error) {
                    return translate('ra.notification.http_error');
                }

                return undefined;
            };
        },
        [dataProvider, options, record, resource, translate, translateLabel]
    );

    return validateUnique;
};

const DEFAULT_DEBOUNCE = 1000;

export type UseUniqueOptions = {
    debounce?: number;
    resource?: string;
    message?: string;
    filter?: Record<string, any>;
};