import { h, withState, mount, sequence2, RxAble } from 'rx'

const imbricatedMaps =
  withState(1, counter => [
    counterComponent({
      value: counter,
      onSub: () => counter.update(n => n - 1),
      onAdd: () => counter.update(n => n + 1)
    }),
    counter.map(c1 => {
      console.log('c1')
      return [
        h('div', 'Inside first count'),
        counter.map(c2 => {
          console.log('c2')
          return h('div', `Inside second count ${c2}`)
        })
      ]
    })
  ])

const flatMap =
  withState(1, counter => [
    counterComponent({
      value: counter,
      onSub: () => counter.update(n => n - 1),
      onAdd: () => counter.update(n => n + 1)
    }),
    counter.flatMap(c1 => {
      console.log('c1')
      return counter.map(c2 => {
        console.log('c2')
        return h('div', `Inside second count ${c2}`)
      })
    })
  ])

const checkbox =
  withState(false, checked => [
    checkboxComponent({
      label: 'Checkbox',
      isChecked: checked,
      onCheck: (isChecked: boolean) => checked.update(_ => isChecked),
    }),
    checked.map(isChecked => isChecked ? 'C’est coché!' : 'Ça n’est pas coché')
  ])

const rxChildren =
  withState(3, count => [
    h('input', {
      type: 'number',
      value: count,
      onchange: (event: Event) => count.update(_ => parseInt((event.target as HTMLInputElement).value))
    }),
    h('div', 'FOO'),
    count.map(n => Array(n).fill(null).map((_, i) => h('div', `A ${i}!`))),
    h('div', 'BAR'),
    count.map(n => Array(n).fill(null).map((_, i) => h('div', `B ${i}!`))),
    h('div', 'BAZ')
  ])

const nodesCancel =
  withState(false, checked => [
    checkboxComponent({
      label: 'Checkbox',
      isChecked: checked,
      onCheck: (isChecked: boolean) => checked.update(_ => isChecked),
    }),
    checked.map(isChecked => isChecked ? rxChildren : undefined)
  ])

const counters =
  withState<Array<number>>([], counters => {
    return [
      counterComponent({
        value: counters.map(cs => cs.length),
        onSub: () => counters.update(cs => cs.slice(0, -1)),
        onAdd: () => counters.update(cs => cs.concat(0))
      }),
      h('hr'),
      h('div', { style: 'margin-top: 1rem' }, counters.map(cs =>
        cs.map((c, i) =>
          counterComponent({
            value: c,
            onSub: () => counters.update(cs => {
              cs[i] = c - 1
              return cs
            }),
            onAdd: () => counters.update(cs => {
              cs[i] = c + 1
              return cs
            })
          })
        )
      ))
    ]
  })

const rows =
  withState(1, count => [
    h('input', {
      type: 'number',
      value: count,
      onchange: (event: Event) => count.update(_ => parseInt((event.target as HTMLInputElement).value))
    }),
    count.map(n => Array(n).fill(null).map((_, i) => h('div', i)))
  ])

const chrono =
  withState(false, isChecked => [
    checkboxComponent({
      label: 'Show counter',
      isChecked,
      onCheck: b => isChecked.update(_ => b)
    }),
    isChecked.map(b => b && withState(0, elapsed => {
      const interval = window.setInterval(
        () => elapsed.update(n => n + 1),
        1000
      )
      return h(
        'div',
        { onunmount: () => clearInterval(interval) },
        elapsed
      )
    }))
  ])

const doubleMapChild = 
  withState(true, isEven =>
    withState('', search => {
      const books = [...Array(50).keys()]

      const filteredBooks = isEven.flatMap(f => search.map(s =>
        books.filter(b =>
          (f ? b % 2 === 0 : b % 2 === 1) &&
          (s === '' || b.toString().includes(s)))))

      return [
        checkboxComponent({
          label: 'Even?',
          isChecked: isEven,
          onCheck: checked => isEven.update(_ => checked)
        }),
        h(
          'input',
          { oninput: (event: Event) => search.update(_ => (event.target as HTMLInputElement).value)
          , style: 'margin-left: 1rem'
          }
        ),
        h('hr'),
        isEven.map(b =>
          b 
            ? filteredBooks.map(xs => `isEven (${xs.length})`)
            : filteredBooks.map(xs => `isOdd (${xs.length})`)
        ),
        h('hr'),
        filteredBooks.map(bs => bs.map(b => h('div', b))),
        h('hr')
      ]
    })
  )

const seq =
  withState(0, a =>
    withState(0, b =>
      withState(0, c => [
        counterComponent({
          value: a,
          onSub: () => a.update(n => n - 1),
          onAdd: () => a.update(n => n + 1)
        }),
        counterComponent({
          value: b,
          onSub: () => b.update(n => n - 1),
          onAdd: () => b.update(n => n + 1)
        }),
        counterComponent({
          value: c,
          onSub: () => c.update(n => n - 1),
          onAdd: () => c.update(n => n + 1)
        }),
        sequence2([a, b, c]).map(xs => xs.reduce((a, b) => a + b, 0))
      ])
    )
  )

const indirectCheckbox =
  withState(false, checked => [
    checkboxComponent({
      label: 'C1',
      isChecked: checked,
      onCheck: (b: boolean) => checked.update(_ => b)
    }),
    checkboxComponent({
      label: 'C2',
      isChecked: checked,
      onCheck: (b: boolean) => checked.update(_ => b)
    })
  ])

const view = h('main',
  h('h1', 'Rx'),
  indirectCheckbox
)

mount(view)

// Checkbox

interface CheckboxParams {
  label: RxAble<string>
  isChecked: RxAble<boolean>
  onCheck: (isChecked: boolean) => void
}

function checkboxComponent({ label, isChecked, onCheck }: CheckboxParams) {
  return h('label',
    h('input',
      { type: 'checkbox',
        onchange: (event: Event) => onCheck((event.target as HTMLInputElement).checked),
        checked: isChecked,
      }
    ),
    label
  )
}

// Counter

interface CounterParams {
  value: RxAble<number>
  onAdd: () => void
  onSub: () => void
}

function counterComponent({ value, onAdd, onSub}: CounterParams) {
  return h('div',
    [ h('span', { style: 'margin-right: 5px' }, value),
      h('button', { onclick: () => onSub() }, '-'),
      h('button', { onclick: () => onAdd() }, '+'),
    ]
  )
}