const _ = require('lodash');
const tpl = require('@tryghost/tpl');
const errors = require('@tryghost/errors');
const constants = require('@tryghost/constants');
const security = require('@tryghost/security');
const settingsCache = require('../../shared/settings-cache');
const limitService = require('../services/limits');
const ghostBookshelf = require('./base');

const messages = {
    notEnoughPermission: 'You do not have permission to perform this action',
    roleNotFound: 'Role not found',
    notAllowedToInviteOwner: 'Not allowed to invite an owner user.',
    notAllowedToInvite: 'Not allowed to invite this role.'
};

let Invite;
let Invites;

Invite = ghostBookshelf.Model.extend({
    tableName: 'invites',

    toJSON: function (unfilteredOptions) {
        const options = Invite.filterOptions(unfilteredOptions, 'toJSON');
        const attrs = ghostBookshelf.Model.prototype.toJSON.call(this, options);

        delete attrs.token;
        return attrs;
    }
}, {
    orderDefaultOptions: function orderDefaultOptions() {
        return {};
    },

    add: function add(data, unfilteredOptions) {
        const options = Invite.filterOptions(unfilteredOptions, 'add');
        data = data || {};

        if (!options.context || !options.context.internal) {
            data.status = 'pending';
        }

        data.expires = Date.now() + constants.ONE_WEEK_MS;
        data.token = security.tokens.generateFromEmail({
            email: data.email,
            expires: data.expires,
            secret: settingsCache.get('db_hash')
        });

        return ghostBookshelf.Model.add.call(this, data, options);
    },

    async permissible(inviteModel, action, context, unsafeAttrs, loadedPermissions, hasUserPermission, hasApiKeyPermission) {
        const isAdd = (action === 'add');

        if (!isAdd) {
            if (hasUserPermission && hasApiKeyPermission) {
                return Promise.resolve();
            }

            return Promise.reject(new errors.NoPermissionError({
                message: tpl(messages.notEnoughPermission)
            }));
        }

        // CASE: make sure user is allowed to add a user with this role
        return ghostBookshelf.model('Role')
            .findOne({id: unsafeAttrs.role_id})
            .then(async (roleToInvite) => {
                if (!roleToInvite) {
                    return Promise.reject(new errors.NotFoundError({
                        message: tpl(messages.roleNotFound)
                    }));
                }

                if (roleToInvite.get('name') === 'Owner') {
                    return Promise.reject(new errors.NoPermissionError({
                        message: tpl(messages.notAllowedToInviteOwner)
                    }));
                }

                if (isAdd && limitService.isLimited('staff') && roleToInvite.get('name') !== 'Contributor') {
                    // CASE: if your site is limited to a certain number of staff users
                    // Inviting a new user requires we check we won't go over the limit
                    await limitService.errorIfWouldGoOverLimit('staff');
                }

                let allowed = [];
                if (loadedPermissions.user) {
                    if (_.some(loadedPermissions.user.roles, {name: 'Owner'}) ||
                        _.some(loadedPermissions.user.roles, {name: 'Administrator'})) {
                        allowed = ['Administrator', 'Editor', 'Author', 'Contributor'];
                    } else if (_.some(loadedPermissions.user.roles, {name: 'Editor'})) {
                        allowed = ['Author', 'Contributor'];
                    }
                } else if (loadedPermissions.apiKey) {
                    allowed = ['Editor', 'Author', 'Contributor'];
                }

                if (allowed.indexOf(roleToInvite.get('name')) === -1) {
                    throw new errors.NoPermissionError({
                        message: tpl(messages.notAllowedToInvite)
                    });
                }

                if (hasUserPermission && hasApiKeyPermission) {
                    return Promise.resolve();
                }

                return Promise.reject(new errors.NoPermissionError({
                    message: tpl(messages.notEnoughPermission)
                }));
            });
    }
});

Invites = ghostBookshelf.Collection.extend({
    model: Invite
});

module.exports = {
    Invite: ghostBookshelf.model('Invite', Invite),
    Invites: ghostBookshelf.collection('Invites', Invites)
};