import type { H3Event } from 'h3'

import { getRouterParam } from 'h3'

export function httpError(statusCode: number, statusMessage: string): never {
  throw createError({
    statusCode,
    statusMessage
  })
}

export function assertHttp(
  condition: unknown,
  statusCode: number,
  statusMessage: string
): asserts condition {
  if (!condition) {
    httpError(statusCode, statusMessage)
  }
}

export function assertBadRequest(condition: unknown, statusMessage: string): asserts condition {
  assertHttp(condition, 400, statusMessage)
}

export function getRequiredRouteParam(event: H3Event, name: string, label = name) {
  const value = getRouterParam(event, name)

  assertBadRequest(value, `${label} is required`)

  return value
}

export function mapDatabaseError(
  error: unknown,
  handlers: Partial<Record<string, { statusCode: number, statusMessage: string }>>
): never {
  const code = (error as { code?: string } | null)?.code
  const handler = code ? handlers[code] : undefined

  if (handler) {
    httpError(handler.statusCode, handler.statusMessage)
  }

  throw error
}