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import _ from 'lodash';
import { reactive, watch, type Ref } from 'vue';
type ValidatorReturnType = unknown;
export interface UseValidationRule<T> {
validator: (value: T) => ValidatorReturnType;
message: string;
}
export function isFalsyOrHasThrown(cb: () => ValidatorReturnType): boolean {
try {
const returnValue = cb();
if (_.isNil(returnValue)) return true;
return returnValue === false;
} catch (_) {
return true;
}
}
export type ValidationAttrs = {
feedback: string;
validationStatus: string | undefined;
};
export function useValidation<T>({ source, rules }: { source: Ref<T>; rules: UseValidationRule<T>[] }) {
const state = reactive<{
message: string;
status: undefined | 'error';
isValid: boolean;
attrs: ValidationAttrs;
}>({
message: '',
status: undefined,
isValid: false,
attrs: {
validationStatus: undefined,
feedback: '',
},
});
watch(
[source],
() => {
state.message = '';
state.status = undefined;
for (const rule of rules) {
if (isFalsyOrHasThrown(() => rule.validator(source.value))) {
state.message = rule.message;
state.status = 'error';
}
}
state.isValid = state.status !== 'error';
state.attrs.feedback = state.message;
state.attrs.validationStatus = state.status;
},
{ immediate: true },
);
return state;
}
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