'use strict';

const createError = require("create-error");
const pgErrorCodes = require("pg-error-codes");
const DatabaseError = require("../database-error.js");

let UniqueConstraintViolationError = createError(DatabaseError, "UniqueConstraintViolationError");

let detailsRegex = /Key \(([^\)]+)\)=\(([^\)]+)\) already exists\./;

module.exports = {
    error: UniqueConstraintViolationError,
    errorName: "UniqueConstraintViolationError",
    check: function checkType(error) {
        return (
            // PostgreSQL (via `pg`):
            (error.length != null && error.file != null && error.line != null && error.routine != null && error.code === "23505")
        )
    },
    convert: function convertError(error) {
        let [_, column, value] = detailsRegex.exec(error.detail);

        return new UniqueConstraintViolationError(`Value '${value}' already exists for column '${column}' in table '${error.table}'`, {
            originalError: error,
            pgCode: error.code,
            code: pgErrorCodes[error.code],
            schema: error.schema,
            table: error.table,
            column: column,
            value: value,
            constraint: error.constraint
        });
    }
};