const url = require('url');
const settingsCache = require('../settings/cache');
const urlUtils = require('../../lib/url-utils');
const MembersApi = require('@tryghost/members-api');
const MembersSSR = require('@tryghost/members-ssr');
const common = require('../../lib/common');
const models = require('../../models');
const mail = require('../mail');
const blogIcon = require('../../lib/image/blog-icon');
const doBlock = fn => fn();

function createMember({name, email, password}) {
    return models.Member.add({
        name,
        email,
        password
    }).then((member) => {
        return member.toJSON();
    });
}

function updateMember(member, newData) {
    return models.Member.findOne(member, {
        require: true
    }).then(({id}) => {
        return models.Member.edit(newData, {id});
    }).then((member) => {
        return member.toJSON();
    });
}

function getMember(data, options = {}) {
    return models.Member.findOne(data, Object.assign({require: true}, options)).then((model) => {
        if (!model) {
            return null;
        }
        return model.toJSON(options);
    });
}

function deleteMember(options) {
    options = options || {};
    return models.Member.destroy(options).catch(models.Member.NotFoundError, () => {
        throw new common.errors.NotFoundError({
            message: common.i18n.t('errors.api.resource.resourceNotFound', {
                resource: 'Member'
            })
        });
    });
}

function listMembers(options) {
    return models.Member.findPage(options).then((models) => {
        return {
            members: models.data.map(model => model.toJSON(options)),
            meta: models.meta
        };
    });
}

function validateMember({email, password}) {
    return models.Member.findOne({email}, {
        require: true
    }).then((member) => {
        return member.comparePassword(password).then((res) => {
            if (!res) {
                throw new Error('Password is incorrect');
            }
            return member;
        });
    }).then((member) => {
        return member.toJSON();
    });
}

function getSubscriptionSettings() {
    let membersSettings = settingsCache.get('members_subscription_settings');
    if (!membersSettings) {
        membersSettings = {
            isPaid: false,
            paymentProcessors: [{
                adapter: 'stripe',
                config: {
                    secret_token: '',
                    public_token: '',
                    product: {
                        name: 'Ghost Subscription'
                    },
                    plans: [
                        {
                            name: 'Monthly',
                            currency: 'usd',
                            interval: 'month',
                            amount: ''
                        },
                        {
                            name: 'Yearly',
                            currency: 'usd',
                            interval: 'year',
                            amount: ''
                        }
                    ]
                }
            }]
        };
    }
    if (!membersSettings.isPaid) {
        membersSettings.paymentProcessors = [];
    }
    return membersSettings;
}

const siteUrl = urlUtils.getSiteUrl();
const siteOrigin = doBlock(() => {
    const {protocol, host} = url.parse(siteUrl);
    return `${protocol}//${host}`;
});

const contentApiUrl = urlUtils.urlFor('api', {version: 'v2', type: 'content'}, true);
const membersApiUrl = urlUtils.urlFor('api', {version: 'v2', type: 'members'}, true);

const accessControl = {
    [siteOrigin]: {
        [contentApiUrl]: {
            tokenLength: '20m'
        },
        [membersApiUrl]: {
            tokenLength: '180d'
        }
    },
    '*': {
        tokenLength: '20m'
    }
};

const sendEmail = (function createSendEmail(mailer) {
    return function sendEmail(member, {token}) {
        if (!(mailer instanceof mail.GhostMailer)) {
            mailer = new mail.GhostMailer();
        }
        const message = {
            to: member.email,
            subject: 'Reset password',
            html: `
            Hi ${member.name},

            To reset your password, click the following link and follow the instructions:

            ${siteUrl}#reset-password?token=${token}

            If you didn't request a password change, just ignore this email.
            `
        };

        /* eslint-disable */
        // @TODO remove this
        console.log(message.html);
        /* eslint-enable */
        return mailer.send(message).catch((err) => {
            return Promise.reject(err);
        });
    };
})();

const getSiteConfig = () => {
    return {
        title: settingsCache.get('title') ? settingsCache.get('title').replace(/"/g, '\\"') : 'Publication',
        icon: blogIcon.getIconUrl()
    };
};

const membersApiInstance = MembersApi({
    authConfig: {
        issuer: membersApiUrl,
        ssoOrigin: siteOrigin,
        publicKey: settingsCache.get('members_public_key'),
        privateKey: settingsCache.get('members_private_key'),
        sessionSecret: settingsCache.get('members_session_secret'),
        accessControl
    },
    paymentConfig: {
        processors: getSubscriptionSettings().paymentProcessors
    },
    siteConfig: getSiteConfig(),
    createMember,
    getMember,
    deleteMember,
    listMembers,
    validateMember,
    updateMember,
    sendEmail
});

const updateSettingFromModel = function updateSettingFromModel(settingModel) {
    if (!['members_subscription_settings', 'title', 'icon'].includes(settingModel.get('key'))) {
        return;
    }

    membersApiInstance.reconfigureSettings({
        paymentConfig: {
            processors: getSubscriptionSettings().paymentProcessors
        },
        siteConfig: getSiteConfig()
    });
};

// Bind to events to automatically keep subscription info up-to-date from settings
common.events.on('settings.edited', updateSettingFromModel);

module.exports = membersApiInstance;
module.exports.ssr = MembersSSR({
    cookieSecure: urlUtils.isSSL(siteUrl),
    cookieKeys: [settingsCache.get('theme_session_secret')],
    membersApi: membersApiInstance
});
module.exports.isPaymentConfigured = function () {
    return getSubscriptionSettings().paymentProcessors.length !== 0;
};