# things_test.ludic - a toy camp: kinds as data with their behaviour as function values, the
# verbs and what the port hears of them, the spatial questions, the facts, and the save by key
import "ludic.things"
import "ludic.base"
program ThingsTest {
  numbers float
  state ThingsTestState {
    drawn: int = 0
    gone: int = 0
    shows: int = 0
    back: int = 0
    wood: int = 0
  }

  function lit_prompt(t: Thing) -> string {
    if t.used != 0 { return "Add wood" }
    return "Light it"
  }
  function lit_use(t: Thing) -> void { t.used = 1 }
  function tent_name(t: Thing) -> string {
    if t.owner == 0 { return "Your tent" }
    return ""
  }
  function branch_use(things_test_st: mut ThingsTestState, t: Thing) -> void {
    things_test_st.wood += 1
    thing_hide(t)
  }
  function lure_tick(t: Thing, hours: float) -> void {
    t.timer -= hours
    if t.timer < 0.0 { thing_hide(t) }
  }
  function far_reach(t: Thing) -> float { return 9.0 }

  def ThingKinds tent { name: "A tent", name_of: fn tent_name }
  def ThingKinds fire { name: "The fire", prompt: fn lit_prompt, use: fn lit_use, keeps: true }
  def ThingKinds branch { name: "Firewood", reach: 1.5, use: fn branch_use }
  def ThingKinds lure { name: "A lure", tick: fn lure_tick, put_down: true, saved: true }
  def ThingKinds sign { name: "A sign", reach_of: fn far_reach }

  function hill(x: float, z: float) -> float { return x * 0.5 }
  function on_placed(things_test_st: mut ThingsTestState, t: Thing) -> void { things_test_st.drawn += 1 }
  function on_removed(things_test_st: mut ThingsTestState, t: Thing) -> void { things_test_st.gone += 1 }
  function on_shown(things_test_st: mut ThingsTestState, t: Thing) -> void { things_test_st.shows += 1 }
  function on_restored(things_test_st: mut ThingsTestState, t: Thing) -> void { things_test_st.back += 1 }
  bind ThingsWorld { ground: fn hill, placed: fn on_placed, removed: fn on_removed, shown: fn on_shown, restored: fn on_restored }

  function put(things_st: mut ThingsState, kind: int, x: float, z: float) -> Thing { return thing_spawn(things_st, kind, "m", x, 0.0, z, 0.0, 0) }
  function facts(things_st: ThingsState) -> []ThingFact { return q_drain(things_facts(things_st)) }

  test "a spawn is drawn, numbered and said" (things_st: mut ThingsState, things_test_st: ThingsTestState) {
    things_clear(things_st)
    let a = put(things_st, TH_TENT, 1.0, 1.0)
    let b = put(things_st, TH_FIRE, 2.0, 2.0)
    expect_eq(things_test_st.drawn, 2)
    expect(a.uid != b.uid)
    expect_eq(things_count(things_st), 2)
    let fs = facts(things_st)
    expect_eq(len(fs), 2)
    expect_eq(fs[1].what, THING_PLACED)
    expect_eq(fs[1].kind, TH_FIRE)
    expect(thing_by_uid(things_st, b.uid) == b)
  }

  test "the spatial questions see only what is active" (things_st: mut ThingsState, things_test_st: ThingsTestState) {
    things_clear(things_st)
    let near = put(things_st, TH_BRANCH, 1.0, 0.0)
    let far = put(things_st, TH_BRANCH, 5.0, 0.0)
    put(things_st, TH_FIRE, 3.0, 0.0)
    expect(thing_nearest(things_st, TH_BRANCH, 0.0, 0.0) == near)
    expect(thing_nearest(things_st, -1, 3.2, 0.0).kind == TH_FIRE)
    expect_eq(len(things_within(things_st, 0.0, 0.0, 3.5)), 2)
    expect(things_within(things_st, 6.0, 0.0, 10.0)[0] == far)
    thing_hide(near)
    expect(thing_nearest(things_st, TH_BRANCH, 0.0, 0.0) == far)
    expect_eq(len(things_each(things_st, TH_BRANCH)), 1)
    expect_eq(len(things_each_all(things_st, TH_BRANCH)), 2)
    expect(thing_find(things_st, TH_BRANCH, -1) == far)
    expect(thing_find(things_st, TH_TENT, -1) == null)
    expect_eq(things_test_st.shows, 1)
  }

  test "remove and move tell the port" (things_st: mut ThingsState, things_test_st: ThingsTestState) {
    things_clear(things_st)
    let a = put(things_st, TH_TENT, 1.0, 1.0)
    put(things_st, TH_TENT, 2.0, 2.0)
    facts(things_st)
    thing_remove(things_st, a)
    expect_eq(things_test_st.gone, 1)
    expect_eq(things_count(things_st), 1)
    expect_eq(facts(things_st)[0].what, THING_REMOVED)
    let b = thing_find(things_st, TH_TENT, -1)
    thing_move(b, 4.0, 0.0, 1.0)
    expect_near(b.y, 2.0, 0.001)
    let c = thing_put(things_st, TH_BRANCH, "stick", 2.0, 0.0, 0.0, 0.25, 1.9, 7)
    expect_near(c.y, 0.75, 0.001)
    expect_near(thing_reach(c), 1.9, 0.001)
    expect_eq(c.id, 7)
  }

  test "the kind answers: name, prompt, use, reach" (things_st: mut ThingsState) {
    things_clear(things_st)
    let t = put(things_st, TH_TENT, 0.0, 0.0)
    expect(thing_name(t) == "A tent")
    t.owner = 0
    expect(thing_name(t) == "Your tent")
    let f = put(things_st, TH_FIRE, 0.0, 0.0)
    expect(thing_prompt(f) == "Light it")
    thing_use(things_st, f)
    expect(thing_prompt(f) == "Add wood")
    expect(thing_prompt(t) == "")
    expect(not thing_can_use(t))
    expect_near(thing_reach(f), 2.2, 0.001)
    expect_near(thing_reach(put(things_st, TH_BRANCH, 0.0, 0.0)), 1.5, 0.001)
    expect_near(thing_reach(put(things_st, TH_SIGN, 0.0, 0.0)), 9.0, 0.001)
    let fs = facts(things_st)
    expect_eq(fs[len(fs) - 3].what, THING_USED)
  }

  test "ticks and a restock" (things_st: mut ThingsState, things_test_st: ThingsTestState) {
    things_clear(things_st)
    let l = put(things_st, TH_LURE, 0.0, 0.0)
    l.timer = 1.0
    let b = put(things_st, TH_BRANCH, 0.0, 0.0)
    let f = put(things_st, TH_FIRE, 0.0, 0.0)
    thing_use(things_st, b)
    thing_use(things_st, f)
    expect_eq(things_test_st.wood, 1)
    things_tick(things_st, 0.6)
    expect(l.active)
    things_tick(things_st, 0.6)
    expect(not l.active)
    things_restock(things_st)
    expect(b.active)
    expect(not l.active)
    expect_eq(f.used, 1)
  }

  test "the save keeps what the port keeps, by the kind's key" (things_st: mut ThingsState, things_test_st: ThingsTestState) {
    things_clear(things_st)
    let l = put(things_st, TH_LURE, 3.0, 4.0)
    l.owner = 0
    l.timer = 2.5
    put(things_st, TH_TENT, 0.0, 0.0)
    let root = save_tree()
    save_section(root, "things", 1, things_save(things_st))
    let text = save_encode(root)
    things_clear(things_st)
    put(things_st, TH_LURE, 9.0, 9.0)
    let n = load_section(save_decode(text), "things")
    things_load(things_st, n.data, n.version)
    expect_eq(things_count(things_st), 1)
    let t = thing_find(things_st, TH_LURE, -1)
    expect_near(t.x, 3.0, 0.001)
    expect_near(t.timer, 2.5, 0.001)
    expect_eq(t.owner, 0)
    expect_eq(things_test_st.back, 1)
  }

  test "removals keep the indexes true: nearest, find, uid and the columns agree" (things_st: mut ThingsState) {
    things_clear(things_st)
    var keep: Thing = null
    for i in 0 .. 400 {
      let t = put(things_st, TH_BRANCH + (i % 2), float(i) * 3.0 - 600.0, float(i % 17) * 5.0)
      if i == 250 { keep = t }
    }
    let gone = thing_find(things_st, TH_BRANCH, -1)
    let uid = gone.uid
    thing_remove(things_st, gone)
    expect(thing_by_uid(things_st, uid) == null)
    expect(thing_by_uid(things_st, keep.uid) == keep)
    expect_eq(things_count(things_st), 399)
    expect_eq(things_count_of(things_st, TH_BRANCH), 199)
    thing_move(keep, 5000.0, 5000.0, 0.0)
    expect(thing_nearest(things_st, -1, 4990.0, 4990.0) == keep)
    thing_hide(keep)
    expect(thing_nearest(things_st, -1, 4990.0, 4990.0) != keep)
    expect_eq(things_verify(things_st), 0)
    keep.x = 1.0
    expect_eq(things_verify(things_st), 1)
  }

  test "a chunk's Things are counted and let go together; a move carries a Thing to its new chunk" (things_st: mut ThingsState, things_test_st: ThingsTestState) {
    things_clear(things_st)
    put(things_st, TH_BRANCH, 10.0, 10.0)
    put(things_st, TH_BRANCH, 20.0, 30.0)
    let far = put(things_st, TH_BRANCH, 600.0, 10.0)
    let here = things_chunk(10.0, 10.0)
    expect_eq(things_chunk_count(things_st, here), 2)
    expect_eq(things_chunk_count(things_st, things_chunk(600.0, 10.0)), 1)
    thing_move(far, 15.0, 15.0, 0.0)
    expect_eq(things_chunk_count(things_st, here), 3)
    facts(things_st)
    let gone = things_test_st.gone
    expect_eq(things_drop_chunk(things_st, here), 3)
    expect_eq(things_count(things_st), 0)
    expect_eq(things_test_st.gone, gone + 3)
    expect_eq(len(facts(things_st)), 3)
    expect_eq(things_verify(things_st), 0)
  }

  test "change detection names what a verb wrote since the tick a consumer kept" (things_st: mut ThingsState) {
    things_clear(things_st)
    let a = put(things_st, TH_BRANCH, 1.0, 0.0)
    let b = put(things_st, TH_BRANCH, 2.0, 0.0)
    let seen = things_now(things_st)
    let rows = words(0)
    let out = new []Thing
    expect_eq(things_changed(things_st, seen, rows, out), 0)
    thing_hide(b)
    expect_eq(things_changed(things_st, seen, rows, out), 1)
    expect(out[0] == b)
    let later = things_now(things_st)
    thing_move(a, 9.0, 9.0, 0.0)
    expect_eq(things_changed(things_st, later, rows, out), 1)
    expect(out[0] == a)
    expect_eq(things_changed(things_st, seen, rows, out), 2)
  }
}