import { readFileSync } from 'node:fs'

export interface AppBranding {
  brandName: string
  institutionName: string
  productName: string
  shortName: string
  tagline: string
  description: string
}

interface AppSettings {
  Branding?: Partial<Record<keyof AppBranding | Capitalize<keyof AppBranding>, unknown>>
}

const appsettings = JSON.parse(
  readFileSync(new URL('../src/Jiaowu.Api/appsettings.json', import.meta.url), 'utf8'),
) as AppSettings

function required(field: keyof AppBranding): string {
  const pascalCase = `${field.charAt(0).toUpperCase()}${field.slice(1)}` as Capitalize<keyof AppBranding>
  const value = appsettings.Branding?.[pascalCase] ?? appsettings.Branding?.[field]
  if (typeof value !== 'string' || !value.trim()) {
    throw new Error(`appsettings.json 中缺少 Branding:${pascalCase}。`)
  }
  return value.trim()
}

export const branding: Readonly<AppBranding> = Object.freeze({
  brandName: required('brandName'),
  institutionName: required('institutionName'),
  productName: required('productName'),
  shortName: required('shortName'),
  tagline: required('tagline'),
  description: required('description'),
})