import { ComponentType, type HiddenFieldComponent } from '@defra/forms-model'

import { ComponentCollection } from '~/src/server/plugins/engine/components/ComponentCollection.js'
import {
  getAnswer,
  type Field
} from '~/src/server/plugins/engine/components/helpers/components.js'
import { FormModel } from '~/src/server/plugins/engine/models/FormModel.js'
import definition from '~/test/form/definitions/blank.js'
import { getFormData, getFormState } from '~/test/helpers/component-helpers.js'

describe('HiddenField', () => {
  let model: FormModel

  beforeEach(() => {
    model = new FormModel(definition, {
      basePath: 'test'
    })
  })

  describe('Defaults', () => {
    let def: HiddenFieldComponent
    let collection: ComponentCollection
    let field: Field

    beforeEach(() => {
      def = {
        title: 'Hidden field',
        name: 'myComponent',
        type: ComponentType.HiddenField,
        options: {}
      } satisfies HiddenFieldComponent

      collection = new ComponentCollection([def], { model })
      field = collection.fields[0]
    })

    describe('Schema', () => {
      it('uses component title as label as default', () => {
        const { formSchema } = collection
        const { keys } = formSchema.describe()

        expect(keys).toHaveProperty(
          'myComponent',
          expect.objectContaining({
            flags: expect.objectContaining({
              label: 'Hidden field'
            })
          })
        )
      })

      it('uses component name as keys', () => {
        const { formSchema } = collection
        const { keys } = formSchema.describe()

        expect(field.keys).toEqual(['myComponent'])
        expect(field.collection).toBeUndefined()

        for (const key of field.keys) {
          expect(keys).toHaveProperty(key)
        }
      })

      it('is required by default', () => {
        const { formSchema } = collection
        const { keys } = formSchema.describe()

        expect(keys).toHaveProperty(
          'myComponent',
          expect.objectContaining({
            flags: expect.objectContaining({
              presence: 'required'
            })
          })
        )
      })
      it('accepts valid values', () => {
        const result1 = collection.validate(getFormData('Hidden value'))
        const result2 = collection.validate(getFormData('Hidden value 2'))

        expect(result1.errors).toBeUndefined()
        expect(result2.errors).toBeUndefined()
      })

      it('adds errors for empty value', () => {
        const result = collection.validate(getFormData(''))

        expect(result.errors).toEqual([
          expect.objectContaining({
            text: 'Enter hidden field'
          })
        ])
      })

      it('adds errors for invalid values', () => {
        const result1 = collection.validate(getFormData(['invalid']))
        const result2 = collection.validate(
          // @ts-expect-error - Allow invalid param for test
          getFormData({ unknown: 'invalid' })
        )

        expect(result1.errors).toBeTruthy()
        expect(result2.errors).toBeTruthy()
      })
    })

    describe('State', () => {
      it('returns text from state', () => {
        const state1 = getFormState('Hidden field')
        const state2 = getFormState(null)

        const answer1 = getAnswer(field, state1)
        const answer2 = getAnswer(field, state2)

        expect(answer1).toBe('Hidden field')
        expect(answer2).toBe('')
      })

      it('returns payload from state', () => {
        const state1 = getFormState('Hidden field')
        const state2 = getFormState(null)

        const payload1 = field.getFormDataFromState(state1)
        const payload2 = field.getFormDataFromState(state2)

        expect(payload1).toEqual(getFormData('Hidden field'))
        expect(payload2).toEqual(getFormData())
      })

      it('returns value from state', () => {
        const state1 = getFormState('Hidden field')
        const state2 = getFormState(null)

        const value1 = field.getFormValueFromState(state1)
        const value2 = field.getFormValueFromState(state2)

        expect(value1).toBe('Hidden field')
        expect(value2).toBeUndefined()
      })

      it('returns context for conditions and form submission', () => {
        const state1 = getFormState('Hidden field')
        const state2 = getFormState(null)

        const value1 = field.getContextValueFromState(state1)
        const value2 = field.getContextValueFromState(state2)

        expect(value1).toBe('Hidden field')
        expect(value2).toBeNull()
      })

      it('returns state from payload', () => {
        const payload1 = getFormData('Hidden field')
        const payload2 = getFormData()

        const value1 = field.getStateFromValidForm(payload1)
        const value2 = field.getStateFromValidForm(payload2)

        expect(value1).toEqual(getFormState('Hidden field'))
        expect(value2).toEqual(getFormState(null))
      })
    })

    describe('View model', () => {
      it('sets Nunjucks component defaults', () => {
        const viewModel = field.getViewModel(getFormData('Hidden field'))

        expect(viewModel).toEqual(
          expect.objectContaining({
            label: { text: def.title },
            name: 'myComponent',
            id: 'myComponent',
            value: 'Hidden field'
          })
        )
      })
    })

    describe('AllPossibleErrors', () => {
      it('should return errors', () => {
        const errors = field.getAllPossibleErrors()
        expect(errors.baseErrors).not.toBeEmpty()
        expect(errors.advancedSettingsErrors).toBeEmpty()
      })
    })
  })
})