'use strict';

const createError = require("create-error");

const DatabaseError = require("./database-error");

let UnknownError = createError("UnknownError");

let handlers = [
	require("./errors/unique-constraint-violation"),
	require("./errors/check-constraint-violation"),
	require("./errors/foreign-key-constraint-violation"),
	require("./errors/enum"),
	require("./errors/invalid-type"),
	require("./errors/undefined-column"),
	require("./errors/not-null-constraint-violation"),
]

function convertError(error) {
	let handler = handlers.find(handler => handler.check(error));

	if (handler != null) {
		return handler.convert(error);
	} else {
		throw new UnknownError("The specified error is not of a recognized type");
	}
}

function rethrowBetterError(originalError) {
	try {
		let betterError = convertError(originalError);
		throw betterError;
	} catch (err) {
		if (err instanceof UnknownError) {
			throw originalError;
		} else {
			throw err;
		}
	}
}

let errorTypes = handlers.reduce((errors, handler) => {
	errors[handler.errorName] = handler.error;
	return errors;
}, {});

module.exports = Object.assign({
	convert: convertError,
	rethrow: rethrowBetterError,
	UnknownError: UnknownError,
	DatabaseError: DatabaseError
}, errorTypes)