"use strict";

const unreachable = require("@joepie91/unreachable")("zapdb");
const matchValue = require("match-value");

// const createLMDBBackend = require("./backend/lmdb");
const queryBuilder = require("./query-builder");

// TODO: Type decoding hook for eg. turning decimal strings into bigints or numbers

Object.assign(module.exports, queryBuilder);

function findNodeType(nodes, type) {
	let nodeIndex = nodes.findIndex((node) => node.type === type);

	if (nodeIndex != null) {
		return nodes[nodeIndex];
	} else {
		throw new Error(`Failed to locate expected '${type}' node`);
	}
}

let temporaryHardcodedSchema = [
	{ name: "_id", type: "bytes", required: true },
	{ name: "username", type: "string", required: true },
	{ name: "email", type: "string", required: true },
	{ name: "activated", type: "boolean", required: true },
	{ name: "notes", type: "string", required: false }
];

module.exports.createClient = function(options) {
	let { schema, backend } = options;

	function insertQuery(query, parameters) {
		let items = findNodeType(query.clauses, "items").items;
		console.log(items);
	}

	function selectQuery(query, parameters) {}
	function updateQuery(query, parameters) {}
	function deleteQuery(query, parameters) {}

	return {
		query: function (query, parameters) {
			matchValue(query.type, {
				insert: () => insertQuery(query, parameters),
				update: () => updateQuery(query, parameters),
				delete: () => deleteQuery(query, parameters),
				select: () => selectQuery(query, parameters),
			});
		},
		transaction: function (callback) {
			
		}
	};
};