import {isEqual} from './lib/isEqual'
import {WorkshopMsg, WorkshopState} from './types'

/** @internal */
export function workshopReducer(state: WorkshopState, msg: WorkshopMsg): WorkshopState {
  if (msg.type === 'workshop/frameReady') {
    return {...state, frameReady: true}
  }

  if (msg.type === 'workshop/setState') {
    if (isEqual(state, msg.value)) {
      return state
    }

    return msg.value
  }

  if (msg.type === 'workshop/setZoom') {
    if (state.zoom === msg.value) return state

    return {...state, zoom: msg.value}
  }

  if (msg.type === 'workshop/setViewport') {
    if (state.viewport === msg.value) return state

    return {...state, viewport: msg.value}
  }

  if (msg.type === 'workshop/toggleScheme') {
    return {...state, scheme: state.scheme === 'light' ? 'dark' : 'light'}
  }

  if (msg.type === 'workshop/setScheme') {
    if (state.scheme === msg.value) return state

    return {...state, scheme: msg.value}
  }

  if (msg.type === 'workshop/setPath') {
    if (state.path === msg.value) return state

    return {...state, path: msg.value}
  }

  if (msg.type === 'workshop/setPayload') {
    if (isEqual(state.payload, msg.value)) {
      return state
    }

    return {...state, payload: msg.value}
  }

  if (msg.type === 'workshop/setPayloadValue') {
    const payload = {...state.payload, [msg.key]: msg.value}

    if (isEqual(state.payload, payload)) {
      return state
    }

    return {...state, payload}
  }

  return state
}