const domain = 'localhost'
const port = 3001
const httpProtocol = `http`
const prefix = 'api'
const remote = `${httpProtocol}://${domain}:${port}/${prefix}`

const headerTemplate = {
    method: null,
    mode: 'cors', // no-cors, *cors, same-origin
    cache: 'no-cache', // *default, no-cache, reload, force-cache, only-if-cached
    credentials: 'omit', // include, *same-origin, omit
    headers: {
        'Content-Type': 'application/json',
        // 'Content-Type': 'application/x-www-form-urlencoded',
    },
    redirect: 'manual', // manual, *follow, error
    referrerPolicy: 'no-referrer', // no-referrer, *no-referrer-when-downgrade, origin, origin-when-cross-origin, same-origin, strict-origin, strict-origin-when-cross-origin, unsafe-url
    body: null, // body data type must match "Content-Type" header
}

class Connector {
    constructor() {
        this.apiPrefix = prefix
        this._verbs = {
            get: 'GET',
            post: 'POST',
            patch: 'PATCH',
        }
    }
    _makeHeader({ method, payload, authorization }) {
        const header = { ...headerTemplate }
        header.method = method
        if (payload) {
            header.body = JSON.stringify(payload)
        }
        if (authorization) {
            header.headers.authorization = authorization
        }
        return header
    }
    async _tryFetch({ endpoint, header }, returnHeaders = false) {
        try {
            const res = await fetch(`${remote}${endpoint}`, header)
            if (!res.ok) {
                throw Error(res.statusText)
            }
            if (returnHeaders) {
                return res.headers
            } else {
                const jsonRes = await res.json()
                return jsonRes.data
            }
        } catch (error) {
            console.error(`[API Util]: ${error}\nroute:`, endpoint)
        }
    }
    async get(endpoint, authHeaders = false) {
        if (authHeaders) {
            return await this._tryFetch({
                endpoint,
                header: this._makeHeader({
                    method: this._verbs.get,
                    authorization: `${authHeaders}`,
                }),
            })
        } else {
            return await this._tryFetch({
                endpoint,
                header: this._makeHeader({ method: this._verbs.get }),
            })
        }
    }
    async post(endpoint, payload = {}, returnHeaders = false) {
        return await this._tryFetch({
            endpoint,
            header: this._makeHeader({ method: this._verbs.post, payload }),
            returnHeaders,
        })
    }
    async patch(endpoint, payload = {}) {
        return await this._tryFetch({
            endpoint,
            header: this._makeHeader({ method: this._verbs.patch, payload }),
        })
    }

    /** !: DEV ONLY */
    // async removeAll() { }
}
const db = new Connector()

export { Connector, db, remote }