import {
  set,
  get,
  omit,
  pick,
  isEqual,
  isEmpty,
  debounce,
  isBoolean,
} from 'lodash'
import { handleError } from 'pubsweet-component-faraday-ui'

import {
  autosaveRequest,
  autosaveSuccess,
  autosaveFailure,
} from '../redux/autosave'
import { SubmissionStatement } from './'

export const setInitialValues = ({ fragment }) => ({
  initialValues: {
    files: get(fragment, 'files', {}),
    authors: get(fragment, 'authors', []),
    metadata: get(fragment, 'metadata', {}),
    conflicts: get(fragment, 'conflicts', {
      hasConflicts: 'no',
      hasDataAvailability: '',
      hasFunding: '',
    }),
    declarations: get(fragment, 'declarations', { agree: false }),
  },
})

export const validate = values => {
  const errors = {}

  if (!get(values, 'declarations.agree')) {
    set(errors, 'declarations.agree', 'Required')
  }

  if (isEmpty(get(values, 'authors', []))) {
    errors.authors = 'Authors are required.'
  }

  if (!isBoolean(values.authorForm) && values.authorForm > -1) {
    errors.authors = 'You have an unsaved author.'
  }

  if (isBoolean(values.authorForm) && values.authorForm) {
    errors.authors = 'Finish or cancel adding a new author.'
  }

  if (isEmpty(get(values, 'files.manuscripts', []))) {
    errors.files = 'At least one manuscript file is required.'
  }

  return errors
}

const _onChange = (
  values,
  dispatch,
  { collection, fragment, updateFragment },
) => {
  const previousValues = pick(fragment, [
    'files',
    'authors',
    'metadata',
    'conflicts',
    'declarations',
  ])
  const newValues = omit(values, ['agree', 'authorForm'])
  if (!isEqual(newValues, previousValues)) {
    dispatch(autosaveRequest())
    updateFragment(collection, {
      ...fragment,
      ...newValues,
    }).then(
      () => dispatch(autosaveSuccess()),
      () => dispatch(autosaveFailure()),
    )
  }
}

export const onChange = debounce(_onChange, 1000, { maxWait: 5000 })

export const onSubmit = (
  values,
  dispatch,
  {
    step,
    history,
    nextStep,
    showModal,
    hideModal,
    isEditMode,
    setModalError,
    submitManuscript,
    fragment: { id: fragmentId },
    collection: { id: collectionId, customId },
  },
) => {
  if (step !== 2) {
    nextStep()
  } else if (!isEditMode) {
    showModal({
      title:
        'By submitting the manuscript, you agree to the following statements:',
      content: SubmissionStatement,
      confirmText: 'AGREE & SUBMIT',
      cancelText: 'BACK TO SUBMISSION',
      onConfirm: () => {
        dispatch(autosaveRequest())
        submitManuscript({ collectionId, fragmentId })
          .then(r => {
            hideModal()
            dispatch(autosaveSuccess())
            history.push('/confirmation-page', {
              customId,
              fragment: fragmentId,
              collection: collectionId,
            })
          })
          .catch(err => {
            hideModal()
            handleError(setModalError)(err)
          })
      },
      onCancel: hideModal,
    })
  } else {
    history.goBack()
  }
}