const objectPath = require('object-path');

const NAME_REGEX = /^[a-z0-9_-]+$/;
const DESCRIPTION_REGEX = /^[A-Z]{1}.+\.$/

function required() {
    return (path, input, msgs) => {
        if(!input) {
            msgs.push(`Property '${path}' must be set! value=${input}`)
        }
    }
}

function length(min, max=-1) {
    return (path, input, msgs) => {
        if(min > 0 && input.length < min) {
            msgs.push(`Property '${path}' must have at least ${min} characters! actual=${input.length}`)
        }
        if(max > 0 && input.length > max) {
            msgs.push(`Property '${path}' must not have more than ${max} characters! actual=${input.length}`)
        }  
    }
}

function regex(regex) {
    return (path, input, msgs) => {
        if(!input.match(regex)) {
            msgs.push(`Property '${path}' must only comply to pattern ${regex}! value=${input}`)
        }
    }
}


const linterMappings = [
    { path: 'name', linters: [ required(), length(4), regex(NAME_REGEX) ] },
    { path: 'description', linters: [ required(), length(4), regex(DESCRIPTION_REGEX) ] }
] 


module.exports.lint = function(spec) {
    let messages = [];
    linterMappings.forEach(element => {
        let value = objectPath.get(spec, element.path);
        element.linters.forEach(linter => {
            linter(element.path, value, messages);
        });
    });
    return messages;
}

module.exports.regex = {
    NAME_REGEX,
    DESCRIPTION_REGEX
}