import { ref } from 'vue';
import { useI18n } from 'vue-i18n';
import axios from 'axios';
import validator from 'validator';


const models = ref(null);

export function useValidator() {
    if (!models.value) fetch();

    function fetch() {
        axios.get('Schemas/ModelInfo')
            .then(response => models.value = response.data)
    }

    function validate(propertyRule) {
        const modelInfo = models.value;
        if (!modelInfo || !propertyRule) return;

        const rule = propertyRule.split('.');
        const model = rule[0];
        const property = rule[1];
        const modelName = model.charAt(0).toUpperCase() + model.slice(1);

        if (!modelInfo[modelName]) return;

        const modelValidations = modelInfo[modelName].validations;

        if (!modelValidations[property]) return;

        const rules = modelValidations[property].map((validation) => {
            return validations(validation)[validation.validation];
        });

        return rules;
    }

    const { t } = useI18n();
    const validations = function (validation) {
        return {
            presence: (value) => !validator.isEmpty(value ? String(value) : '') || t(validation.message),
            length: (value) => {
                const options = {
                    min: validation.min || validation.is,
                    max: validation.max || validation.is
                };

                value = String(value);

                if (!value) value = '';

                let message = `Value should have at most ${options.max} characters`;
                if (validation.is)
                    message = `Value should be ${validation.is} characters long`;
                if (validation.min)
                    message = `Value should have at least ${validation.min} characters`;
                if (validation.min && validation.max)
                    message = `Value should have a length between ${validation.min} and ${validation.max}`;

                return validator.isLength(value, options) || message;
            },
            numericality: (value) => {
                if (validation.int)
                    return validator.isInt(value) || 'Value should be integer'
                return validator.isNumeric(value) || 'Value should be a number'
            },
            custom: (value) => validation.bindedFunction(value) || 'Invalid value'
        };
    };

    return {
        validate
    };
}