import { CHARACTERS, isCharacterCode, type CharacterCode } from './characters'

export type Intensity = 0 | 1 | 2 | 3

export type Config = {
  character: CharacterCode | null
  intensity: Intensity
  address: string | null
}

export const DEFAULT_INTENSITY: Intensity = 2

function toIntensity(value: unknown): Intensity {
  const n = typeof value === 'number' ? value : Number(value)
  return n === 0 || n === 1 || n === 2 || n === 3 ? n : DEFAULT_INTENSITY
}

// 缺失或無效的值一律退回預設，不讓設定錯誤擋住載入。
export function resolveConfig(options: Readonly<Record<string, unknown>>): Config {
  const address = typeof options.address === 'string' ? options.address.trim() : ''
  return {
    character: isCharacterCode(options.defaultCharacter) ? options.defaultCharacter : null,
    intensity: toIntensity(options.intensity),
    address: address === '' ? null : address,
  }
}

// 使用者的覆寫優先，否則用角色在原作中對使用者的稱呼。
export function addressFor(config: Config, character: CharacterCode): string {
  return config.address ?? CHARACTERS[character].address
}