module.exports = {
    async init() {
        if (this._initialized) return;
        this.init_config();
        this.init_errors();
        this.init_globals();
        this._initialized = true;
    },

    init_config() {
        this.config = {
            backend: 'sqlite',
            port: 8000
        };
    },

    init_errors() {
        this.ValueError = class extends Error { };
    },

    init_globals() {
        this.meta_cache = {};
    },

    get_meta(doctype) {
        if (!this.meta_cache[doctype]) {
            this.meta_cache[doctype] = new (this.models.get_meta_class(doctype))(this.models.get('DocType', doctype));
        }
        return this.meta_cache[doctype];
    },

    init_controller(doctype, module) {
        doctype = this.slug(doctype);
        this.models.controllers[doctype] = module[doctype];
        this.models.meta_classes[doctype] = module[doctype + '_meta'];
    },

    async get_doc(data, name) {
        if (typeof data==='string' && typeof name==='string') {
            let controller_class = this.models.get_controller(data);
            var doc = new controller_class({doctype:data, name: name});
            await doc.load();
        } else {
            let controller_class = this.models.get_controller(data.doctype);
            var doc = new controller_class(data);
        }
        return doc;
    },

    async insert(data) {
        const doc = await this.get_doc(data);
        return await doc.insert();
    },

    login(user='guest', user_key) {
        this.session = new this._session.Session(user);
        if (user && user_key) {
            this.authenticate(user_key);
        }
    },

    close() {
        this.db.close();

        if (this.server) {
            this.server.close();
        }
    }
};