const Joi = require('joi');
const { requestRegex } = require('./shared.js');

const pluginSchema = [
    Joi.string(),
    Joi.object()
        .keys(null)
        .max(1)
];

const requestSchema = [
    Joi.object()
        .keys({
            HEADERS: Joi.object().keys(null),
            PAYLOAD: [Joi.object().keys(null), Joi.string()],
            PARAMS: Joi.object().keys(null),
            FORM: Joi.object().keys(null),
            ALIAS: Joi.string().required(),
            FORMDATA: Joi.object().keys(null)
        })
        .without('FORM', ['PAYLOAD', 'FORMDATA'])
        .without('PAYLOAD', ['FORM', 'FORMDATA'])
        .without('FORMDATA', ['FORM', 'PAYLOAD'])
        .rename(/headers/i, 'HEADERS', { override: true })
        .rename(/payload/i, 'PAYLOAD', { override: true })
        .rename(/params/i, 'PARAMS', { override: true })
        .rename(/form/i, 'FORM', { override: true })
        .rename(/alias/i, 'ALIAS', { override: true }),

    Joi.string()
];

const hostSchema = Joi.object()
    .keys({
        HOST: Joi.string().required(),
        ENDPOINT: Joi.string(),
        DEFAULTS: Joi.object().keys(null)
    })
    .pattern(requestRegex, requestSchema)
    .rename(/host/i, 'HOST', { override: true })
    .rename(/defaults/i, 'DEFAULTS', { override: true })
    .rename(/endpoint/i, 'ENDPOINT', { override: true });

const schema = Joi.object()
    .keys({
        VERSION: Joi.number().integer(),
        ENDPOINT: Joi.string().uri(),
        PLUGINS: Joi.array().items(pluginSchema),
        DEFAULTS: Joi.object(),
        ENVIRONMENT: Joi.object(),
        HOSTS: Joi.array().items(hostSchema),
        COOKIEJAR: Joi.boolean()
    })
    .pattern(requestRegex, requestSchema)
    .rename(/version/i, 'VERSION', { override: true })
    .rename(/endpoint/i, 'ENDPOINT', { override: true })
    .rename(/hosts/i, 'HOSTS', { override: true })
    .rename(/plugins/i, 'PLUGINS', { override: true })
    .rename(/defaults/i, 'DEFAULTS', { override: true })
    .rename(/environment/i, 'ENVIRONMENT', { override: true })
    .rename(/cookiejar/i, 'COOKIEJAR', { override: true });

const validate = async function(config) {
    try {
        await Joi.validate(config, schema, { allowUnknown: true });
        return { valid: true };
    } catch ({ name, details }) {
        return {
            valid: false,
            message: `${name}: \n ${details
                .map(d => d.message + ' @ ' + d.path)
                .join(' \n ')}`
        };
    }
};

module.exports = { schema, validate };