const fs = require('fs')
const path = require('path')

const ROOT = path.resolve(__dirname, '..')
const ENV_PATH = path.join(ROOT, '.env')
const OUT_PATH =
  process.env.CONFIG_OUT || path.join(ROOT, 'public', 'config.js')

const DEFAULTS = {
  VUE_APP_NAME: 'irandom',
  VUE_APP_TITLE: 'irandom',
  VUE_APP_BRAND_URL: 'https://git.imiheev.online/admin/irandom',
  VUE_APP_LOGO_URL: '/logo.png',
  VUE_APP_DEFAULT_LOCALE: 'ru',
  VUE_APP_COLOR_PRIMARY: '#c9a66b',
  VUE_APP_COLOR_ACCENT: '#e6c566',
  VUE_APP_COLOR_BG: '#1a1815',
  VUE_APP_COLOR_SURFACE: '#2e2820',
  VUE_APP_COLOR_SURFACE_RAISED: '#3a3228',
  VUE_APP_COLOR_TEXT: '#ffffff',
  VUE_APP_COLOR_TEXT_MUTED: '#c8c0b4',
  VUE_APP_COLOR_DANGER: '#ee5c5c',
  VUE_APP_COLOR_LINK: '#4a6a8a',
  VUE_APP_COLOR_BORDER: '#4a4034'
}

function parseEnvFile(filePath) {
  if (!fs.existsSync(filePath)) {
    return {}
  }

  const result = {}
  const lines = fs.readFileSync(filePath, 'utf8').split(/\r?\n/)

  for (const line of lines) {
    const trimmed = line.trim()
    if (!trimmed || trimmed.startsWith('#')) {
      continue
    }

    const eq = trimmed.indexOf('=')
    if (eq === -1) {
      continue
    }

    const key = trimmed.slice(0, eq).trim()
    let value = trimmed.slice(eq + 1).trim()
    if (
      (value.startsWith('"') && value.endsWith('"')) ||
      (value.startsWith("'") && value.endsWith("'"))
    ) {
      value = value.slice(1, -1)
    }
    result[key] = value
  }

  return result
}

function buildConfig(fileEnv) {
  // Container / shell env overrides .env file
  const pick = (key) => process.env[key] || fileEnv[key] || DEFAULTS[key]

  return {
    name: pick('VUE_APP_NAME'),
    title: pick('VUE_APP_TITLE'),
    brandUrl: pick('VUE_APP_BRAND_URL'),
    logoUrl: pick('VUE_APP_LOGO_URL'),
    defaultLocale: pick('VUE_APP_DEFAULT_LOCALE'),
    colors: {
      primary: pick('VUE_APP_COLOR_PRIMARY'),
      accent: pick('VUE_APP_COLOR_ACCENT'),
      bg: pick('VUE_APP_COLOR_BG'),
      surface: pick('VUE_APP_COLOR_SURFACE'),
      surfaceRaised: pick('VUE_APP_COLOR_SURFACE_RAISED'),
      text: pick('VUE_APP_COLOR_TEXT'),
      textMuted: pick('VUE_APP_COLOR_TEXT_MUTED'),
      danger: pick('VUE_APP_COLOR_DANGER'),
      link: pick('VUE_APP_COLOR_LINK'),
      border: pick('VUE_APP_COLOR_BORDER')
    }
  }
}

const fileEnv = parseEnvFile(ENV_PATH)
const config = buildConfig(fileEnv)
const payload = JSON.stringify(config, null, 2)

const output = `/* Generated by scripts/generate-config.js — do not edit by hand */
window.__APP_CONFIG__ = ${payload};
`

fs.mkdirSync(path.dirname(OUT_PATH), { recursive: true })
fs.writeFileSync(OUT_PATH, output, 'utf8')
console.log(`Wrote ${OUT_PATH}`)