const {URL} = require('url');
const crypto = require('crypto');
const createKeypair = require('keypair');
const path = require('path');

const COMPLIMENTARY_PLAN = {
    name: 'Complimentary',
    currency: 'usd',
    interval: 'year',
    amount: '0'
};

class MembersConfigProvider {
    /**
     * @param {object} options
     * @param {{get: (key: string) => any}} options.settingsCache
     * @param {{get: (key: string) => any}} options.config
     * @param {any} options.urlUtils
     * @param {any} options.logging
     * @param {{original: string}} options.ghostVersion
     */
    constructor(options) {
        this._settingsCache = options.settingsCache;
        this._config = options.config;
        this._urlUtils = options.urlUtils;
        this._logging = options.logging;
        this._ghostVersion = options.ghostVersion;
    }

    /**
     * @private
     */
    _getDomain() {
        const domain = this._urlUtils.urlFor('home', true).match(new RegExp('^https?://([^/:?#]+)(?:[/:?#]|$)', 'i'));
        return domain && domain[1];
    }

    getEmailFromAddress() {
        const fromAddress = this._settingsCache.get('members_from_address') || 'noreply';

        // Any fromAddress without domain uses site domain, like default setting `noreply`
        if (fromAddress.indexOf('@') < 0) {
            return `${fromAddress}@${this._getDomain()}`;
        }
        return fromAddress;
    }

    getEmailSupportAddress() {
        const supportAddress = this._settingsCache.get('members_support_address') || 'noreply';

        // Any fromAddress without domain uses site domain, like default setting `noreply`
        if (supportAddress.indexOf('@') < 0) {
            return `${supportAddress}@${this._getDomain()}`;
        }
        return supportAddress;
    }

    getAuthEmailFromAddress() {
        return this.getEmailSupportAddress() || this.getEmailFromAddress();
    }

    getPublicPlans() {
        const defaultPriceData = {
            monthly: 0,
            yearly: 0,
            currency: 'USD'
        };

        try {
            const plans = this._settingsCache.get('stripe_plans') || [];

            const priceData = plans.reduce((prices, plan) => {
                const numberAmount = 0 + plan.amount;
                const dollarAmount = numberAmount ? Math.round(numberAmount / 100) : 0;
                return Object.assign(prices, {
                    [plan.name.toLowerCase()]: dollarAmount
                });
            }, {});

            priceData.currency = plans[0].currency || 'USD';

            if (Number.isInteger(priceData.monthly) && Number.isInteger(priceData.yearly)) {
                return priceData;
            }

            return defaultPriceData;
        } catch (err) {
            return defaultPriceData;
        }
    }

    /**
     * @param {'direct' | 'connect'} type - The "type" of keys to fetch from settings
     * @returns {{publicKey: string, secretKey: string} | null}
     */
    getStripeKeys(type) {
        if (type !== 'direct' && type !== 'connect') {
            throw new Error();
        }

        const secretKey = this._settingsCache.get(`stripe_${type === 'connect' ? 'connect_' : ''}secret_key`);
        const publicKey = this._settingsCache.get(`stripe_${type === 'connect' ? 'connect_' : ''}publishable_key`);

        if (!secretKey || !publicKey) {
            return null;
        }

        return {
            secretKey,
            publicKey
        };
    }

    /**
     * @returns {{publicKey: string, secretKey: string} | null}
     */
    getActiveStripeKeys() {
        const stripeDirect = this._config.get('stripeDirect');

        if (stripeDirect) {
            return this.getStripeKeys('direct');
        }

        const connectKeys = this.getStripeKeys('connect');

        if (!connectKeys) {
            return this.getStripeKeys('direct');
        }

        return connectKeys;
    }

    isStripeConnected() {
        return this.getActiveStripeKeys() !== null;
    }

    getStripeUrlConfig() {
        const siteUrl = this._urlUtils.getSiteUrl();

        const webhookHandlerUrl = new URL('members/webhooks/stripe/', siteUrl);

        const checkoutSuccessUrl = new URL(siteUrl);
        checkoutSuccessUrl.searchParams.set('stripe', 'success');
        const checkoutCancelUrl = new URL(siteUrl);
        checkoutCancelUrl.searchParams.set('stripe', 'cancel');

        const billingSuccessUrl = new URL(siteUrl);
        billingSuccessUrl.searchParams.set('stripe', 'billing-update-success');
        const billingCancelUrl = new URL(siteUrl);
        billingCancelUrl.searchParams.set('stripe', 'billing-update-cancel');

        return {
            checkoutSuccess: checkoutSuccessUrl.href,
            checkoutCancel: checkoutCancelUrl.href,
            billingSuccess: billingSuccessUrl.href,
            billingCancel: billingCancelUrl.href,
            webhookHandler: webhookHandlerUrl.href
        };
    }

    getStripePaymentConfig() {
        if (!this.isStripeConnected()) {
            return null;
        }

        const stripeApiKeys = this.getActiveStripeKeys();
        const urls = this.getStripeUrlConfig();

        if (!stripeApiKeys) {
            return null;
        }

        return {
            publicKey: stripeApiKeys.publicKey,
            secretKey: stripeApiKeys.secretKey,
            checkoutSuccessUrl: urls.checkoutSuccess,
            checkoutCancelUrl: urls.checkoutCancel,
            billingSuccessUrl: urls.billingSuccess,
            billingCancelUrl: urls.billingCancel,
            webhookHandlerUrl: urls.webhookHandler,
            webhook: {
                id: this._settingsCache.get('members_stripe_webhook_id'),
                secret: this._settingsCache.get('members_stripe_webhook_secret')
            },
            enablePromoCodes: this._config.get('enableStripePromoCodes'),
            product: {
                name: this._settingsCache.get('stripe_product_name')
            },
            plans: [COMPLIMENTARY_PLAN].concat(this._settingsCache.get('stripe_plans') || []),
            appInfo: {
                name: 'Ghost',
                partner_id: 'pp_partner_DKmRVtTs4j9pwZ',
                version: this._ghostVersion.original,
                url: 'https://ghost.org/'
            }
        };
    }

    getAuthSecret() {
        const hexSecret = this._settingsCache.get('members_email_auth_secret');
        if (!hexSecret) {
            this._logging.warn('Could not find members_email_auth_secret, using dynamically generated secret');
            return crypto.randomBytes(64);
        }
        const secret = Buffer.from(hexSecret, 'hex');
        if (secret.length < 64) {
            this._logging.warn('members_email_auth_secret not large enough (64 bytes), using dynamically generated secret');
            return crypto.randomBytes(64);
        }
        return secret;
    }

    getAllowSelfSignup() {
        return this._settingsCache.get('members_allow_free_signup');
    }

    getTokenConfig() {
        const {href: membersApiUrl} = new URL(
            this._urlUtils.getApiPath({version: 'v4', type: 'members'}),
            this._urlUtils.urlFor('admin', true)
        );

        let privateKey = this._settingsCache.get('members_private_key');
        let publicKey = this._settingsCache.get('members_public_key');

        if (!privateKey || !publicKey) {
            this._logging.warn('Could not find members_private_key, using dynamically generated keypair');
            const keypair = createKeypair({bits: 1024});
            privateKey = keypair.private;
            publicKey = keypair.public;
        }

        return {
            issuer: membersApiUrl,
            publicKey,
            privateKey
        };
    }

    getSigninURL(token, type) {
        const siteUrl = this._urlUtils.getSiteUrl();
        const signinURL = new URL(siteUrl);
        signinURL.pathname = path.join(signinURL.pathname, '/members/');
        signinURL.searchParams.set('token', token);
        signinURL.searchParams.set('action', type);
        return signinURL.href;
    }
}

module.exports = MembersConfigProvider;