import {
  ComponentType,
  type CheckboxesFieldComponent
} from '@defra/forms-model'
import { toLower } from 'lodash'
import lowerFirst from 'lodash/lowerFirst.js'
import { outdent } from 'outdent'

import { CheckboxesField } from '~/src/server/plugins/engine/components/CheckboxesField.js'
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 {
  listNumber,
  listNumberExamples,
  listString,
  listStringExamples
} from '~/test/fixtures/list.js'
import definition from '~/test/form/definitions/blank.js'
import { getFormData, getFormState } from '~/test/helpers/component-helpers.js'

describe.each([
  {
    component: {
      title: 'String list title',
      shortDescription: 'String list',
      name: 'myComponent',
      type: ComponentType.CheckboxesField,
      list: 'listString',
      options: {}
    } satisfies CheckboxesFieldComponent,

    options: {
      label: 'string list',
      list: listString,
      examples: listStringExamples,
      allow: ['1', '2', '3', '4'],
      deny: ['5', '6', '7', '8']
    }
  },
  {
    component: {
      title: 'Number list title',
      name: 'myComponent',
      shortDescription: 'Number list',
      type: ComponentType.CheckboxesField,
      list: 'listNumber',
      options: {}
    } satisfies CheckboxesFieldComponent,

    options: {
      label: 'number list',
      list: listNumber,
      examples: listNumberExamples,
      allow: [1, 2, 3, 4],
      deny: [5, 6, 7, 8]
    }
  }
])('CheckboxesField: $component.title', ({ component: def, options }) => {
  const updated = structuredClone(definition)
  updated.lists = [options.list]

  let model: FormModel
  let collection: ComponentCollection
  let field: Field

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

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

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

        expect(keys).toHaveProperty(
          'myComponent',
          expect.objectContaining({
            flags: expect.objectContaining({ label: def.shortDescription })
          })
        )
      })

      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('is optional when configured', () => {
        const collectionOptional = new ComponentCollection(
          [{ ...def, options: { required: false } }],
          { model }
        )

        const { formSchema } = collectionOptional
        const { keys } = formSchema.describe()

        expect(keys).toHaveProperty(
          'myComponent',
          expect.objectContaining({
            flags: expect.objectContaining({
              presence: 'optional'
            })
          })
        )

        const result = collectionOptional.validate(getFormData())
        expect(result.errors).toBeUndefined()
      })

      it('is configured for single values', () => {
        const { formSchema } = collection
        const { keys } = formSchema.describe()

        expect(keys).toHaveProperty(
          'myComponent',
          expect.objectContaining({
            flags: expect.objectContaining({
              single: true
            })
          })
        )
      })

      it('is configured with checkbox items', () => {
        const { formSchema } = collection
        const { keys } = formSchema.describe()

        expect(keys).toHaveProperty(
          'myComponent',
          expect.objectContaining({
            items: [
              {
                allow: options.allow,
                flags: {
                  label: def.shortDescription,
                  only: true
                },
                type: options.list.type
              }
            ]
          })
        )
      })

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

        expect(result.errors).toEqual([
          expect.objectContaining({
            text: `Select ${lowerFirst(options.label)}`
          })
        ])
      })

      it.each([...options.allow])(
        'accepts valid checkbox single item',
        (value) => {
          const result = collection.validate(getFormData(value))
          expect(result.errors).toBeUndefined()
        }
      )

      it.each([...options.allow])(
        'accepts valid checkbox array item',
        (value) => {
          const result = collection.validate(getFormData([value]))
          expect(result.errors).toBeUndefined()
        }
      )

      it.each([...options.deny])(
        'rejects invalid checkbox single item',
        (value) => {
          const result = collection.validate(getFormData(value))

          expect(result.errors).toEqual([
            expect.objectContaining({
              text: `Select ${toLower(def.shortDescription)}`
            })
          ])
        }
      )

      it.each([...options.deny])(
        'rejects invalid checkbox array item',
        (value) => {
          const result = collection.validate(getFormData([value]))

          expect(result.errors).toEqual([
            expect.objectContaining({
              text: `Select ${lowerFirst(options.label)}`
            })
          ])
        }
      )

      it('adds errors for invalid values', () => {
        const result1 = collection.validate(getFormData('invalid'))
        const result2 = collection.validate(
          getFormData(['invalid1', 'invalid2'])
        )

        const result3 = collection.validate(
          // @ts-expect-error - Allow invalid param for test
          getFormData({ unknown: 'invalid' })
        )

        expect(result1.errors).toBeTruthy()
        expect(result2.errors).toBeTruthy()
        expect(result3.errors).toBeTruthy()
      })
    })

    describe('State', () => {
      it.each([...options.examples])(
        'returns text from state (single)',
        (item) => {
          const state1 = getFormState([item.value])
          const state2 = getFormState(null)

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

          expect(answer1).toBe(outdent`
            <ul>
            <li>${item.text}</li>
            </ul>
          `)

          expect(answer2).toBe('')
        }
      )

      it('returns text from state (multiple)', () => {
        const item1 = options.examples[0]
        const item2 = options.examples[2]

        const state = getFormState([item1.value, item2.value])
        const answer = getAnswer(field, state)

        expect(answer).toBe(outdent`
          <ul>
          <li>${item1.text}</li>
          <li>${item2.text}</li>
          </ul>
        `)
      })

      it.each([...options.examples])('returns payload from state', (item) => {
        const state1 = getFormState([item.value])
        const state2 = getFormState(null)

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

        expect(payload1).toEqual(getFormData([item.value]))
        expect(payload2).toEqual(getFormData())
      })

      it.each([...options.examples])('returns value from state', (item) => {
        const state1 = getFormState([item.value])
        const state2 = getFormState(null)

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

        expect(value1).toEqual([item.value])
        expect(value2).toBeUndefined()
      })

      it.each([...options.examples])(
        'returns context for conditions and form submission',
        (item) => {
          const state1 = getFormState([item.value])
          const state2 = getFormState(null)

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

          expect(value1).toEqual([item.value])
          expect(value2).toEqual([])
        }
      )

      it.each([...options.examples])('returns state from payload', (item) => {
        const payload1 = getFormData([item.value])
        const payload2 = getFormData()

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

        expect(value1).toEqual(getFormState([item.value]))
        expect(value2).toEqual(getFormState(null))
      })
    })

    describe('View model', () => {
      it('sets Nunjucks component defaults', () => {
        const item = options.examples[0]

        const viewModel = field.getViewModel(getFormData([item.value]))

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

      it.each([...options.examples])(
        'sets Nunjucks component checkbox items',
        (item) => {
          const viewModel = field.getViewModel(getFormData([item.value]))

          expect(viewModel.items?.[0]).not.toMatchObject({
            value: '' // First item is never empty
          })

          expect(viewModel.items).toEqual(
            expect.arrayContaining([
              expect.objectContaining({
                text: item.text,
                value: item.value,
                checked: true
              })
            ])
          )
        }
      )
    })

    describe('Checkbox items', () => {
      it('returns checkbox items', () => {
        expect(field).toHaveProperty('items', options.list.items)
      })

      it('returns checkbox items matching type', () => {
        expect(field).toHaveProperty('values', expect.arrayContaining([]))
      })

      it('returns empty items when missing', () => {
        const model = new FormModel(definition, {
          basePath: 'test'
        })

        const { items } = new CheckboxesField(def, { model })
        expect(items).toEqual([])
      })
    })

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

    describe('getDisplayStringFromFormValue', () => {
      it('returns empty string when value is undefined', () => {
        const checkboxField = field as CheckboxesField
        const result = checkboxField.getDisplayStringFromFormValue(undefined)
        expect(result).toBe('')
      })

      it('returns empty string when value is empty array', () => {
        const checkboxField = field as CheckboxesField
        const result = checkboxField.getDisplayStringFromFormValue([])
        expect(result).toBe('')
      })

      it.each([...options.examples])(
        'returns text for single selected value',
        (item) => {
          const checkboxField = field as CheckboxesField
          const result = checkboxField.getDisplayStringFromFormValue([
            item.value
          ])
          expect(result).toBe(item.text)
        }
      )

      it('returns comma-separated text for multiple selected values', () => {
        const checkboxField = field as CheckboxesField
        const item1 = options.examples[0]
        const item2 = options.examples[2]

        const result = checkboxField.getDisplayStringFromFormValue([
          item1.value,
          item2.value
        ])

        expect(result).toBe(`${item1.text}, ${item2.text}`)
      })
    })
  })
})