const fetch = require('node-fetch')

class Beeminder {
    constructor(token) {
        this.token = token
    }
    async post_request(url, post_data, method="POST") {
        const response = await fetch("https://www.beeminder.com/api/v1/" + url + ".json", {
            method: 'POST',
            body: JSON.stringify(Object.assign({}, post_data, {auth_token: this.token})),
            headers: {'Content-Type': 'application/json'}
        })
        if (response.ok || response.status == 422) {
            return response.json()
        } else {
            throw [response.status, await response.text()]
        }
    }
    async get_request(url, params={}) {
        const qs = new URLSearchParams(Object.assign({}, params, {auth_token: this.token}))
        const response = await fetch("https://www.beeminder.com/api/v1/" + url + ".json?" + qs.toString())
        if (response.ok || response.status == 422) {
            return response.json()
        } else {
            throw [response.status, await response.text()]
        }
    }
    user(user="me") {
        return new User(this, user)
    }
    charge(amount, note, dryrun=true) {
        return this.b.post_request(`charges`, {amount, note, dryrun})
    }
}

class User {
    constructor(b, user) {
        Object.assign(this, {b, user})
    }
    info() {
        return this.b.get_request(`users/${this.user}`)
    }
    goals() {
        return this.b.get_request(`users/${this.user}/goals`)
    }
    goal(goal) {
        return new Goal(this.b, this.user, goal)
    }
    create_goal(params) {
        return this.b.post_request(`users/${this.user}/goals`, params, 'POST')
    }
}
class Goal {
    constructor(b, user, goal) {
        Object.assign(this, {b, user, goal})
        this.prefix = `users/${this.user}/goals/${this.goal}`
    }
    info() {
        return this.b.get_request(`${this.prefix}`)
    }
    update(params) {
        return this.b.post_request(`${this.prefix}`, params, 'PUT')
    }
    refresh_graph() {
        return this.b.get_request(`${this.prefix}/refresh_graph`)
    }
    create_datapoint(params) {
        return this.b.post_request(`${this.prefix}/datapoints`, params)
    }
    create_datapoints(params) {
        return this.b.post_request(`${this.prefix}/datapoints/create_all`, params)
    }
    datapoints(params) {
        return this.get_request(`${this.prefix}/datapoints`, params)
    }
    // todo: put, delete datapoint
}

module.exports = Beeminder