# all files / lib/RequestClient/ DDragonRequest.js

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     import request from 'request'
    import RegionHelper from '../Utils/RegionHelper'

    export const DDragonRequestTypes = {
        REALMS: 'realms',
        API: 'api',
        CDN: {
            BASE: 'cdn', // for just /cdn/endpoint
            TARBALL: 'tarball', // requires own case because the endpoint contains version information, which the Endpoint manager doesn't know of
            DATA: 'cdn_data',
            IMAGE: {
                WITH_VERSION: 'cdn_img_with_version',
                STATIC: 'cdn_img_static',
            },
        },
    }

    // Not sure how I should handle realms, versions, and a regular URL in an easy-to-code way...
    // As realm/version endpoints have different structures from cdn endpoints. We'll see!
    // Committing this to just show my thought process for now.
    const baseUrl = 'https://ddragon.leagueoflegends.com/'
    const createRealmsUrl = endpoint => `${baseUrl}realms/${endpoint}`
    const createApiUrl = endpoint => `${baseUrl}api/${endpoint}`
    // Note that this function has optional arguments. Be careful!
    const createBaseCdnUrl = endpoint => `${baseUrl}cdn/${endpoint}`
    const createCdnUrl = (type, version, locale, endpoint) =>
        createBaseCdnUrl(
            `${version ? version + '/' : ''}${type}/${
                locale ? locale + '/' : ''
            }${endpoint}`,
        )
    const createDataUrl = (version, locale, endpoint) =>
        createCdnUrl('data', version, locale, endpoint)
    const createImageUrl = (version, endpoint) =>
        createCdnUrl('img', version, null, endpoint)

    export const ddragonRequestTypeToUrl = (type, urlInformation) => {
        switch (type) {
            case DDragonRequestTypes.REALMS:
                return createRealmsUrl(urlInformation.endpoint)
            case DDragonRequestTypes.API:
                return createApiUrl(urlInformation.endpoint)
            case DDragonRequestTypes.CDN.BASE:
                return createBaseCdnUrl(urlInformation.endpoint)
            case DDragonRequestTypes.CDN.TARBALL:
                return createBaseCdnUrl(`dragontail-${urlInformation.version}.tgz`)
            case DDragonRequestTypes.CDN.DATA:
                if (!urlInformation.version) {
                    throw new Error(`
                    [kayn]: version() is required for DDragon data requests currently.
                    e.g. kayn.DDragon.Champion.list().version('8.15.1')
                    `)
                }
                return createDataUrl(
                    urlInformation.version,
                    urlInformation.locale,
                    urlInformation.endpoint,
                )
            case DDragonRequestTypes.CDN.IMAGE.WITH_VERSION:
                return createImageUrl(
                    urlInformation.version,
                    urlInformation.endpoint,
                )
            case DDragonRequestTypes.CDN.IMAGE.STATIC:
                return createImageUrl(null, urlInformation.endpoint)
            default:
                throw new Error('Invalid DDragonRequestType.')
        }
    }

    class DDragonRequest {
        constructor(config, endpoint, requestType, methodName, dataTransformer) {
            this.payload = {
                endpoint,
                version: '',
                locale: '',
                region: '',
                type: requestType,
            }
            this.config = config
            this.methodName = methodName
            this.dataTransformer = dataTransformer
        }
        version(version) {
            if (Itypeof version !== 'string')
                throw new Error('DDragonRequest.version takes in a string.')
            if (Eversion) this.payload.version = version
            return this
        }
        locale(locale) {
            if (Ithis.payload.locale)
                throw new Error('Do not call DDragonRequest.locale twice.')
            // Add locale checker
            if (Elocale) this.payload.locale = locale
            return this
        }
        region(region) {
            if (this.payload.region)
                throw new Error('Do not call Request.region twice.')
            if (!RegionHelper.isValidRegion(region))
                throw new Error('Bad region value in Request.region.')
            if (region) this.payload.region = region
            return this
        }
        async then(resolve, reject) {
            const self = this
            return new Promise((innerResolve, innerReject) =>
                self.callback(
                    (err, res) => (err ? innerReject(err) : innerResolve(res)),
                ),
            ).then(resolve, reject)
        }
        async catch(callback) {
            return this.then(null, callback)
        }
        async callback(cb) {
            if (!this.payload.locale) this.payload.locale = this.config.locale
            const { endpoint, version, locale, region, type } = this.payload
            // Hack for making `version` optional!
            // The way this works is that for the given default region,
            // there is a set of versions associated with that region.
            // If the version map for the region is already cached, we use that.
            // Otherwise, we call the endpoint manually, cache it, and then proceed.
            if (type === DDragonRequestTypes.CDN.DATA && !version) {
                const getVersionFromMap = (endpoint, versions) => {
                    if (endpoint.includes('item')) return versions.item
                    if (endpoint.includes('summoner')) return versions.summoner
                    if (endpoint.includes('champion')) return versions.champion
                    if (endpoint.includes('profileicon'))
                        return versions.profileicon
                    if (endpoint.includes('map')) return versions.map
                    if (endpoint.includes('language')) return versions.language
                }
                const executeWithVersion = (endpoint, versions) => {
                    const version = getVersionFromMap(endpoint, versions)
                    const url = ddragonRequestTypeToUrl(type, {
                        endpoint,
                        locale,
                        version,
                    })
                    this.execute(url, cb)
                }
                const realmArg = {
                    endpoint: (region || this.config.region) + '.json',
                }
                const self = this
                if (this.config.cacheOptions.cache) {
                    // Cache exists and version is unspecified
                    this.config.cacheOptions.cache.get(
                        {
                            key: ddragonRequestTypeToUrl(
                                DDragonRequestTypes.REALMS,
                                realmArg,
                            ),
                        },
                        function(err, data) {
                            if (data) {
                                executeWithVersion(endpoint, data.n)
                            } else {
                                const url = ddragonRequestTypeToUrl(
                                    DDragonRequestTypes.REALMS,
                                    realmArg,
                                )
                                self.execute(url, true, function(err, data) {
                                    const { n: versions } = data
                                    executeWithVersion(endpoint, versions)
                                })
                            }
                        },
                    )
                    return
                } else {
                    // Cache does not exist and version is unspecified
                    const url = ddragonRequestTypeToUrl(
                        DDragonRequestTypes.REALMS,
                        realmArg,
                    )
                    self.execute(url, true, function(err, data) {
                        const { n: versions } = data
                        executeWithVersion(endpoint, versions)
                    })
                    return
                }
            }
            // Cache does not exist and version is specified
            const url = ddragonRequestTypeToUrl(type, {
                endpoint,
                locale,
                version,
            })
            this.execute(url, cb)
        }
        async execute(url, isRealmPreRequest, cb) {
            if (typeof isRealmPreRequest === 'function') {
                cb = isRealmPreRequest
                isRealmPreRequest = false
            }
            const { cacheOptions, debugOptions } = this.config
            const fn = async (err, data) => {
                const debugURL = url
                try {
                    if (data) {
                        if (debugOptions.isEnabled) {
                            debugOptions.loggers.cache.get(debugURL)
                        }
                        ok(data)(cb)
                    } else {
                        if (debugOptions.isEnabled) {
                            debugOptions.loggers.request.outgoing(url)
                        }
                        // TODO: Handle this in the future, of course.
                        const { body: res, statusCode } = await makeRequest(url)
                        try {
                            // `request` is making a JSON request, while this is an XML page,
                            // so it doesn't recognize this error within the `catch` block (I think).
                            if (statusCode >= 300) {
                                if (debugOptions.isEnabled) {
                                    debugOptions.loggers.request.incoming.failure(
                                        `[${statusCode}] ${url}`,
                                    )
                                }
                                error({ statusCode, url })(cb)
                                return
                            }
                            if (debugOptions.isEnabled) {
                                debugOptions.loggers.request.incoming.success(
                                    debugURL,
                                )
                            }
                            const blob = JSON.parse(res)
                            const transformedBlob =
                                this.dataTransformer && !isRealmPreRequest
                                    ? this.dataTransformer(blob)
                                    : blob
                            if (
                                cacheOptions.cache &&
                                cacheOptions.ttls[this.methodName] > 0
                            ) {
                                cacheOptions.cache.set(
                                    {
                                        key: url,
                                        ttl: cacheOptions.ttls[this.methodName],
                                    },
                                    transformedBlob,
                                )
                                if (debugOptions.isEnabled) {
                                    debugOptions.loggers.cache.set(`${url}`)
                                }
                            }
                            ok(transformedBlob)(cb)
                        } catch (ex) {
                            // Don't think this is useful?
                            error({
                                statusCode: ex.statusCode,
                                url,
                                error: ex,
                            })(cb)
                        }
                    }
                } catch (ex) {
                    // Don't think this is useful?
                    error({ statusCode: ex.statusCode, url, error: ex })(cb)
                }
            }
            if (cacheOptions.cache) {
                cacheOptions.cache.get({ key: url }, fn)
            } else {
                fn()
            }
        }
    }

    const makeRequest = (url, opts) =>
        new Promise((resolve, reject) => {
            request.get(url, (err, res) => {
                if (err) reject(err)
                else resolve(res)
            })
        })

    const ok = blob => cb => cb(null, blob)
    const error = blob => cb => cb(blob, null)

    export default DDragonRequest