import * as v from 'valibot'
import {
  versionedConfigSchema,
  VersionedWebchatConfig,
  LatestVersionedWebchatConfig,
  initialConfig,
  LATEST_WEBCHAT_CONFIG_VERSION,
} from '../schemas'
type V0Config = Extract<VersionedWebchatConfig, { version: 'v0' }>
type V1Config = Extract<VersionedWebchatConfig, { version: 'v1' }>

export const migrateConfig = (config: Partial<VersionedWebchatConfig>): LatestVersionedWebchatConfig => {
  const parsedConfig = parseConfig(config)

  if (parsedConfig.version === LATEST_WEBCHAT_CONFIG_VERSION) {
    return parsedConfig
  }

  if (parsedConfig.version === 'v0') {
    return migrateConfig(migrateV0ToV1(parsedConfig))
  }

  if (parsedConfig.version === 'v1') {
    return migrateConfig(migrateV1ToV2(parsedConfig))
  }

  const _exhaustiveCheck: never = parsedConfig
  throw new Error(`Unknown webchat config version: ${parsedConfig}`)
}

const migrateV0ToV1 = (config: Partial<V0Config>): Partial<V1Config> => {
  const headerVariant = config.variant === 'solid' ? 'solid' : 'glass'
  const footer = config.showPoweredBy === false ? '' : initialConfig.footer || ''

  return {
    ...config,
    footer,
    headerVariant,
    feedbackEnabled: false,
    version: 'v1',
  }
}

const migrateV1ToV2 = (config: Partial<V1Config>): LatestVersionedWebchatConfig => {
  return {
    ...config,
    proactiveMessageEnabled: false,
    proactiveBubbleMessage: 'Hi! 👋 Need help?',
    proactiveBubbleTriggerType: 'afterDelay',
    proactiveBubbleDelayTime: 10,
    soundEnabled: false,
    version: 'v2',
  }
}

const parseConfig = (config: Partial<VersionedWebchatConfig>) => {
  const baseConfig = {
    ...initialConfig,
    ...config,
  }
  return v.parse(versionedConfigSchema, baseConfig)
}