/**
 * Mojang
 * 
 * This module serves as a minimal wrapper for Mojang's REST api.
 * 
 * @module mojang
 */
// Requirements
const request = require('request')
const logger = require('./loggerutil')('%c[Mojang]', 'color: #a02d2a; font-weight: bold')

// Constants
const minecraftAgent = {
    name: 'Minecraft',
    version: 1
}
const authpath = 'https://authserver.mojang.com'
// Service name comes from https://github.com/GeekcornerGH/helios-status-page/tree/master/api
const statuses = [
    {
        service: 'mojang-multiplayer-session-service',
        status: 'grey',
        name: 'Multiplayer Session Service',
        essential: true
    },
    {
        service: 'mojang-authserver',
        status: 'grey',
        name: 'Authentication Service',
        essential: true
    },
    {
        service: 'minecraft-skins',
        status: 'grey',
        name: 'Minecraft Skins',
        essential: false
    },
    {
        service: 'mojang-s-public-api',
        status: 'grey',
        name: 'Public API',
        essential: false
    },
    {
        service: 'minecraft-net-website',
        status: 'grey',
        name: 'Minecraft.net',
        essential: false
    },
    {
        service: 'mojang-accounts-website',
        status: 'grey',
        name: 'Mojang Accounts Website',
        essential: false
    },
    {
        service: 'microsoft-o-auth-server',
        status: 'grey',
        name: 'Microsoft OAuth Server',
        essential: true
    },
    {
        service: 'xbox-live-auth-server',
        status: 'grey',
        name: 'Xbox Live Auth Server',
        essential: true
    },
    {
        service: 'xbox-live-gatekeeper', // Server used to give XTokens
        status: 'grey',
        name: 'Xbox Live Gatekeeper',
        essential: true
    },
    {
        service: 'microsoft-minecraft-api',
        status: 'grey',
        name: "Minecraft API for Microsoft Accounts",
        essential: true
    },
    {
        service: 'microsoft-minecraft-profile',
        status: "grey",
        name: "Minecraft Profile for Microsoft Accounts",
        essential: false
    }
]
const requestURL = function (serviceURL) { return `https://raw.githubusercontent.com/GeekCornerGH/helios-status-page/master/api/${serviceURL.service}/uptime-day.json`}

// Functions

/**
 * Converts a Mojang status color to a hex value. Valid statuses
 * are 'green', 'yellow', 'red', and 'grey'. Grey is a custom status
 * to our project which represents an unknown status.
 * 
 * @param {string} status A valid status code.
 * @returns {string} The hex color of the status code.
 */
exports.statusToHex = function (status) {
    switch (status.toLowerCase()) {
        case 'green':
            return '#a5c325'
        case 'yellow':
            return '#eac918'
        case 'red':
            return '#c32625'
        case 'grey':
        default:
            return '#848484'
    }
}

/**
 * Retrieves the status of Mojang's services.
 * The response is condensed into a single object. Each service is
 * a key, where the value is an object containing a status and name
 * property.
 * 
 * @see http://wiki.vg/Mojang_API#API_Status
 */
exports.status = async function () {
    return new Promise(async (resolve, reject) => {
        let data = []
        for(let i=0; i<statuses.length; i++){
            request.get(requestURL(statuses[i]),
                {
                    json: true,
                    timeout: 10000
                },
                function (error, response, body) {

                    if (error || response.statusCode !== 200) {
                        logger.warn('Unable to retrieve Mojang status.')
                        logger.debug('Error while retrieving Mojang statuses:', error)
                        data.push(statuses[i])
                        //reject(error || response.statusCode)
                        resolve(statuses)
                    } else {
                        if (response.body.color == "brightgreen") statuses[i].status = "green"
                        else statuses[i].status = "red"
                        data.push(statuses[i])
                        resolve(statuses)
                    }
                })
        }
        return data
    })
}

/**
 * Authenticate a user with their Mojang credentials.
 * 
 * @param {string} username The user's username, this is often an email.
 * @param {string} password The user's password.
 * @param {string} clientToken The launcher's Client Token.
 * @param {boolean} requestUser Optional. Adds user object to the reponse.
 * @param {Object} agent Optional. Provided by default. Adds user info to the response.
 * 
 * @see http://wiki.vg/Authentication#Authenticate
 */
exports.authenticate = function (username, password, clientToken, requestUser = true, agent = minecraftAgent) {
    return new Promise((resolve, reject) => {
        const body = {
            agent,
            username,
            password,
            requestUser
        }
        if (clientToken != null) {
            body.clientToken = clientToken
        }

        request.post(authpath + '/authenticate',
            {
                json: true,
                body
            },
            function (error, response, body) {
                if (error) {
                    logger.error('Error during authentication.', error)
                    reject(error)
                } else {
                    if (response.statusCode === 200) {
                        resolve(body)
                    } else {
                        reject(body || { code: 'ENOTFOUND' })
                    }
                }
            })
            setTimeout(resolve, 15000)
    })
}

/**
 * Validate an access token. This should always be done before launching.
 * The client token should match the one used to create the access token.
 * 
 * @param {string} accessToken The access token to validate.
 * @param {string} clientToken The launcher's client token.
 * 
 * @see http://wiki.vg/Authentication#Validate
 */
exports.validate = function (accessToken, clientToken) {
    return new Promise((resolve, reject) => {
        request.post(authpath + '/validate',
            {
                json: true,
                body: {
                    accessToken,
                    clientToken
                }
            },
            function (error, response, body) {
                if (error) {
                    logger.error('Error during validation.', error)
                    reject(error)
                } else {
                    if (response.statusCode === 403) {
                        resolve(false)
                    } else {
                        // 204 if valid
                        resolve(true)
                    }
                }
            })
    })
}

/**
 * Invalidates an access token. The clientToken must match the
 * token used to create the provided accessToken.
 * 
 * @param {string} accessToken The access token to invalidate.
 * @param {string} clientToken The launcher's client token.
 * 
 * @see http://wiki.vg/Authentication#Invalidate
 */
exports.invalidate = function (accessToken, clientToken) {
    return new Promise((resolve, reject) => {
        request.post(authpath + '/invalidate',
            {
                json: true,
                body: {
                    accessToken,
                    clientToken
                }
            },
            function (error, response, body) {
                if (error) {
                    logger.error('Error during invalidation.', error)
                    reject(error)
                } else {
                    if (response.statusCode === 204) {
                        resolve()
                    } else {
                        reject(body)
                    }
                }
            })
    })
}

/**
 * Refresh a user's authentication. This should be used to keep a user logged
 * in without asking them for their credentials again. A new access token will
 * be generated using a recent invalid access token. See Wiki for more info.
 * 
 * @param {string} accessToken The old access token.
 * @param {string} clientToken The launcher's client token.
 * @param {boolean} requestUser Optional. Adds user object to the reponse.
 * 
 * @see http://wiki.vg/Authentication#Refresh
 */
exports.refresh = function (accessToken, clientToken, requestUser = true) {
    return new Promise((resolve, reject) => {
        request.post(authpath + '/refresh',
            {
                json: true,
                body: {
                    accessToken,
                    clientToken,
                    requestUser
                }
            },
            function (error, response, body) {
                if (error) {
                    logger.error('Error during refresh.', error)
                    reject(error)
                } else {
                    if (response.statusCode === 200) {
                        resolve(body)
                    } else {
                        reject(body)
                    }
                }
            })
    })
}