/*
 * Copyright (c) 2016 MariaDB Corporation Ab
 *
 * Use of this software is governed by the Business Source License included
 * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
 *
 * Change Date: 2020-01-01
 *
 * On the date above, in accordance with the Business Source License, use
 * of this software will be governed by version 2 or later of the General
 * Public License.
 */

var request = require('request');
var colors = require('colors/safe');
var Table = require('cli-table');

module.exports = function() {

    this._ = require('lodash-getpath')
    // Common options for all commands
    this.program = require('yargs');

    // Request a resource collection and format it as a table
    this.getCollection = function (resource, fields) {

        doRequest(resource, function(res) {

            var header = []

            fields.forEach(function(i) {
                header.push(Object.keys(i))
            })

            var table = getTable(header)

            res.data.forEach(function(i) {
                row = []

                fields.forEach(function(p) {
                    var v = _.getPath(i, p[Object.keys(p)[0]], '')

                    if (Array.isArray(v)) {
                        v = v.join(', ')
                    }
                    row.push(v)
                })

                table.push(row)
            })

            console.log(table.toString())
        })
    }

    // Request a part of a resource as a collection
    this.getSubCollection = function (resource, subres, fields) {

        doRequest(resource, function(res) {

            var header = []

            fields.forEach(function(i) {
                header.push(Object.keys(i))
            })

            var table = getTable(header)

            _.getPath(res.data, subres, []).forEach(function(i) {
                row = []

                fields.forEach(function(p) {
                    var v = _.getPath(i, p[Object.keys(p)[0]], '')

                    if (Array.isArray(v) && typeof(v[0]) != 'object') {
                        v = v.join(', ')
                    } else if (typeof(v) == 'object') {
                        v = JSON.stringify(v, null, 4)
                    }
                    row.push(v)
                })

                table.push(row)
            })

            console.log(table.toString())
        })
    }

    // Request a single resource and format it as a key-value list
    this.getResource = function (resource, fields) {

        doRequest(resource, function(res) {
            var table = getList()

            fields.forEach(function(i) {
                var k = Object.keys(i)[0]
                var path = i[k]
                var v = _.getPath(res.data, path, '')

                if (Array.isArray(v) && typeof(v[0]) != 'object') {
                    v = v.join(', ')
                } else if (typeof(v) == 'object') {
                    v = JSON.stringify(v, null, 4)
                }

                var o = {}
                o[k] = v
                table.push(o)
            })

            console.log(table.toString())
        })
    }

    // Helper for converting endpoints to acutal URLs
    this.getUri = function(host, endpoint) {
        var base = 'http://'
        var argv = this.program.argv

        if (argv.secure) {
            base = 'https://'
        }

        return base + argv.user + ':' + argv.password + '@' + host + '/v1/' + endpoint
    }

    // Helper for executing requests and handling their responses
    this.doRequest = function(resource, cb, obj) {
        pingCluster()
            .then(function() {
                var argv = this.program.argv
                argv.hosts.forEach(function(host) {
                    args = obj || {}
                    args.uri = getUri(host, resource)
                    args.json = true
                    args.timeout = argv.timeout

                    request(args, function(err, resp, res) {
                        if (err) {
                            // Failed to request
                            console.log(colors.yellow(host) + ':')
                            logError(JSON.stringify(err, null, 4))
                        } else if (resp.statusCode == 200 && cb) {
                            // Request OK, returns data
                            console.log(colors.yellow(host) + ':')
                            cb(res)
                        } else if (resp.statusCode == 204) {
                            // Request OK, no data
                            console.log(colors.yellow(host) + ': ' + colors.green('OK'))
                        } else {
                            // Unexpected return code, probably an error
                            var errstr = resp.statusCode + ' ' + resp.statusMessage
                            if (res) {
                                errstr += ' ' + JSON.stringify(res, null, 4)
                            }
                            console.log(colors.yellow(host) + ':')
                            logError(errstr)
                        }
                    })
                })
            })
    }

    this.updateValue = function(resource, key, value) {
        var body = {}
        _.set(body, key, value)
        doRequest(resource, null, { method: 'PATCH', body: body })
    }

    this.logError = function(err) {
        console.log(colors.red('Error:'), err)
    }
}

function getList() {
    return new Table({ style: { head: ['cyan'] } })
}

// Creates a table-like array for output. The parameter is an array of header names
function getTable(headobj) {

    for (i = 0; i < headobj.length; i++) {
        headobj[i] = colors.cyan(headobj[i])
    }

    return new Table({
        head: headobj
    })
}

function pingMaxScale(host) {
    return new Promise(function(resolve, reject) {
        request('http://' + host + '/v1', function(err, resp, res) {
            if (err) {
                reject(err)
            } else if (resp.statusCode != 200) {
                reject(resp.statusCode + ' ' + resp.statusMessage)
            } else {
                resolve()
            }
        })
    })
}

function pingCluster() {
    var promises = []

    this.program.argv.hosts.forEach(function(i) {
        promises.push(pingMaxScale(i))
    })

    return Promise.all(promises)
}