import article, div, h1, ul, li, pre from require 'mmm.dom'

_content = {}
append = (stuff) -> table.insert _content, stuff

last = nil
test_group = (name) ->
  if last
    append div (h1 last.name), ul last

  last = { :name }
  (name, test) ->
    ok, err = pcall test
    table.insert last, li if ok
      "passed '#{name}'"
    else
      "failed '#{name}'", pre err

expect = (expected, note, ...) ->
  ok, msg = pcall ...
  if ok or not msg\find expected
    error note

run_test = test_group 'component.moon'

local ReactiveVar, ReactiveElement
run_test "exports ReactiveVar, ReactiveElement", ->
  import ReactiveVar, ReactiveElement from require 'mmm.component'
  assert ReactiveVar, "ReactiveVar not exported"
  assert ReactiveElement, "ReactiveElement not exported"

run_test "exports tohtml helper", ->
  import tohtml from require 'mmm.component'
  assert 'function' == (type tohtml), "tohtml not exported"

-- @TODO: get_or_create

run_test "exports text helper", ->
  import text from require 'mmm.component'
  assert 'function' == (type text), "text not exported"

  node = text 'a test string'

  data = if MODE == 'CLIENT'
    assert (js.instanceof node, js.global.Node), "expected text to generate a Node"
    node.data
  else
    node

  assert data == 'a test string', "expected text to store the string"

run_test "text joins multiple arguments", ->
  import text from require 'mmm.component'

  node = text 'a', 'test', 'string'

  data = if MODE == 'CLIENT' then node.data else node
  assert data == 'a test string', "expected text to join arguments with spaces"

run_test "exports elements table", ->
  import elements from require 'mmm.component'

  assert (type elements.div!) == 'table', "expected to build element with elements.div!"
  assert (type elements.madeup!) == 'table', "expected to build element with elements.madeup!"

run_test = test_group 'ReactiveVar'

run_test "stores a value", ->
  reactive = ReactiveVar 'test'
  assert 'test' == reactive\get!, "expected x to be 'test'"

run_test "provides #map shorthand", ->
  local done

  original = ReactiveVar 1
  mapped = original\map (a) -> a + 10

  assert mapped\get! == 11, "expected mapped to be 11"
  return if MODE == 'SERVER'

  original\set 4
  assert mapped\get! == 14, "expected mapped to update"

  mapped\subscribe coroutine.wrap (next, last) ->
    assert next == 26, "expected next to be 26"
    assert last == 14, "expected last to be 14"
    done = true

  original\set 16
  assert done, "expected to reach the end"

if MODE == 'CLIENT'
  run_test "propagates updates", ->
    local done

    reactive = ReactiveVar 'test'
    reactive\subscribe coroutine.wrap (next) ->
      assert next == 'toast', "expected next to be 'toast'"
      assert coroutine.yield! == 'cheese', "expected next to be 'cheese'"
      done = true

    reactive\set 'toast'
    assert 'toast' == reactive\get!, "expected #get to return 'toast'"
    reactive\set 'cheese'
    assert done, "expected to reach the end"

  run_test "passes old value as well", ->
    local done

    reactive = ReactiveVar 1
    reactive\subscribe coroutine.wrap (next, last) ->
      assert last == 1, "expected last:1 to be 1"
      next, last = coroutine.yield!
      assert last == 2, "expected last:2 to be 2"
      done = true

    reactive\set 2
    reactive\set 3
    assert done, "expected to reach the end"

  run_test "provides #transform shorthand", ->
    local done

    reactive = ReactiveVar 1
    reactive\subscribe coroutine.wrap (next, last) ->
      assert last == 1, "expected last:1 to be 1"
      next, last = coroutine.yield!
      assert last == 2, "expected last:2 to be 2"
      done = true

    add_one = (a) -> a + 1
    reactive\transform add_one
    reactive\transform add_one
    assert done, "expected to reach the end"

  run_test "#subscribe returns function to unsubscribe", ->
    calls = 0

    reactive = ReactiveVar 1
    unsub = reactive\subscribe coroutine.wrap () ->
      calls += 1
      coroutine.yield!
      calls += 1
      coroutine.yield!
      calls += 1

    assert 'function' == (type unsub), "expected to receive a function"

    reactive\set 2
    reactive\set 3
    assert calls == 2, "wat"

    unsub!
    reactive\set 4
    assert calls == 2, "expected to stop receiving updates"

  run_test "tracks multiple subscriptions at once", ->
    reactive = ReactiveVar 'test'
    unsub = reactive\subscribe coroutine.wrap (next) ->
      assert next == 'toast', "expected next to be toast"
      next = coroutine.yield!
      assert next == 'cheese', "expected next to be cheese"
      coroutine.yield!
      error "expected not to get here"

    reactive\set 'toast'

    local done
    reactive\subscribe coroutine.wrap (next) ->
      assert next == 'cheese', "expected next to be cheese"
      next = coroutine.yield!
      assert next == 'test', "expected next to be test"
      done = true

    reactive\set 'cheese'
    unsub!
    reactive\set 'test'
    assert done, "expected to reach the end"

run_test = test_group 'ReactiveElement'

run_test "creates a HTML element", ->
  elem = ReactiveElement 'span'
  assert elem.node and elem.node.localName == 'span', "expected Node to be a <span>"

-- @TODO: can take over a DOM Node

run_test "sets attributes from a table arg", ->
  elem = ReactiveElement 'span', class: 'never'
  assert elem.node.className == 'never', "expected class to be 'never'"

run_test "appends Nodes from arguments", ->
  e_div, e_pre = div!, pre!
  elem = ReactiveElement 'span', e_div, e_pre
  assert elem.node.firstElementChild == e_div, "expected div to be the first child of elem"
  assert elem.node.lastElementChild == e_pre, "expected pre to be the last child of elem"

run_test "can append ReactiveElements and text", ->
  e_div = ReactiveElement 'div'
  elem = ReactiveElement 'div', e_div, 'testtext'
  assert elem.node.firstElementChild == e_div.node, "expected div to be the first child of elem"
  assert elem.node.lastChild.data == 'testtext', "expected last child of elem to be 'testtext'"

run_test "accepts attributes after children", ->
  e_div = div!
  elem = ReactiveElement 'div', e_div, class: 'test'
  assert elem.node.firstElementChild == e_div, "expected div to be the first child of elem"
  assert elem.node.className == 'test', "expected class to be 'test'"

run_test "allows mixing attributes and children in a single table", ->
  e_div, e_pre = div!, pre!
  elem = ReactiveElement 'div', { class: 'test', e_div, e_pre }
  assert elem.node.firstElementChild == e_div, "expected div to be the first child of elem"
  assert elem.node.lastElementChild == e_pre, "expected pre to be the last child of elem"
  assert elem.node.className == 'test', "expected class to be 'test'"

run_test "can unwrap and track attributes from ReactiveVars", ->
  klass = ReactiveVar 'test'
  elem = ReactiveElement 'div', class: klass
  assert elem.node.className == 'test', "expected class to be 'test'"
  klass\set 'toast'
  assert elem.node.className == 'toast', "expected class to be 'toast'"

run_test "can unwrap and track children from ReactiveVars", ->
  child = ReactiveVar h1 'test'
  elem = ReactiveElement 'div', child, pre 'fixed'
  assert elem.node.firstElementChild.localName == 'h1', "expected first child to be h1"
  assert elem.node.childElementCount == 2, "expected node to have two children"
  child\set div 'toast'
  assert elem.node.firstElementChild.localName == 'div', "expected first child to be div"
  assert elem.node.childElementCount == 2, "expected node to have two children"

run_test "warns when appending a string from a ReactiveVar", ->
  import text from require 'mmm.component'

  str = ReactiveVar 'test'
  elem = ReactiveElement 'div', str
  expect 'cannot replace string node', 'expected error', str\set, 'string too'
  elem\destroy!

  elem = ReactiveElement 'div', str\map text
  str\set 'this is text'

test_group!

article _content