import { combineReducers } from 'redux'

const liveInitialState = {
  loading: false,
  error: null,
  opt: {},
  checkpoints: [],
  checkpoint_dir: ['latest'],
  sequences: [],
  fps: 0,
  frame: { i: 0, sequence_i: 0, sequence_len: '1' }
}

const liveReducer = (state = liveInitialState, action) => {
  let results;

  switch(action.type) {
    case 'LOAD_PARAMS':
      if (! action.opt || ! Object.keys(action.opt).length) {
        return state
      }
      return {
        ...state,
        loading: false,
        error: null,
        opt: action.opt,
      }

    case 'SET_PARAM':
      return {
        ...state,
        opt: {
          ...state.opt,
          [action.key]: action.value,
        }
      }

    case 'LIST_CHECKPOINTS':
      return {
        ...state,
        checkpoints: action.checkpoints,
        epochs: [],
      }

    case 'LIST_EPOCHS':
      return {
        ...state,
        epochs: (action.epochs || []).map(a => [ a == 'latest' ? Infinity : a, a ])
                      .sort((a,b) => a[0] - b[0])
                      .map(a => a[1])
    }

    case 'LIST_SEQUENCES':
      return {
        ...state,
        sequences: action.sequences,
      }

    case 'SET_FPS':
      return {
        ...state,
        fps: action.fps,
      }

    case 'CURRENT_FRAME':
      return action.meta ? {
        ...state,
        frame: action.meta
      } : state

    default:
      return state
  }
}

export default liveReducer