# fire_test.ludic - lighting and feeding decided, paid for and applied; burning down in game time,
# faster in the rain; low fuel and going out as facts; warmth and cooking by distance; the save
import "ludic.fire"
import "ludic.base"
program FireTest {
  numbers float
  state FireTestState {
    owns: bool = true
    wet: bool = false
    tarp: bool = false
    ban: bool = false
  }

  function fake_owns(fire_test_st: FireTestState) -> bool { return fire_test_st.owns }
  function fake_wet(fire_test_st: FireTestState) -> bool { return fire_test_st.wet }
  function fake_tarp(fire_test_st: FireTestState) -> bool { return fire_test_st.tarp }
  function fake_allowed(fire_test_st: FireTestState) -> bool { return not fire_test_st.ban }

  bind FireWorld {
    owns_world: fn fake_owns
    is_wet: fn fake_wet
    sheltered: fn fake_tarp
    allowed: fn fake_allowed
  }

  function fresh(fire_st: mut FireState) -> void {
    fire_config(fire_st, 3, 120.0, 60.0, 15.0)
    fire_config_reach(fire_st, 3.6, 3.5)
    fire_reset(fire_st)
  }

  function facts(fire_st: FireState) -> []FireFact { return q_drain(fire_facts(fire_st)) }
  function count(fs: []FireFact, what: int) -> int {
    var n = 0
    for i in 0 .. len(fs) { if fs[i].what == what { n += 1 } }
    return n
  }

  function light(fire_st: mut FireState) -> void { fire_apply(fire_st, fire_decide(fire_st, 3)) }

  test "three logs light it, and that is a fact" (fire_st: mut FireState) {
    fresh(fire_st)
    expect_eq(fire_decide(fire_st, 2), FIRE_NO_WOOD)
    expect_eq(fire_decide(fire_st, 3), FIRE_LIGHT)
    expect_eq(fire_cost(fire_st, FIRE_LIGHT), 3)
    light(fire_st)
    expect(fire_lit(fire_st))
    expect(fire_fuel(fire_st) == 120.0)
    expect_eq(count(facts(fire_st), FIRE_LIT), 1)
  }

  test "a lit fire takes a log for an hour" (fire_st: mut FireState) {
    fresh(fire_st)
    light(fire_st)
    expect_eq(fire_decide(fire_st, 0), FIRE_NO_LOG)
    expect_eq(fire_decide(fire_st, 1), FIRE_FEED)
    expect_eq(fire_cost(fire_st, FIRE_FEED), 1)
    fire_apply(fire_st, FIRE_FEED)
    expect(fire_fuel(fire_st) == 180.0)
  }

  test "a ban and a soaked ring refuse, a tarp keeps it dry" (fire_st: mut FireState, fire_test_st: mut FireTestState) {
    fresh(fire_st)
    fire_test_st.ban = true
    expect_eq(fire_decide(fire_st, 5), FIRE_BANNED)
    fire_test_st.ban = false
    fire_test_st.wet = true
    expect_eq(fire_decide(fire_st, 5), FIRE_SOAKED)
    expect_eq(fire_cost(fire_st, FIRE_SOAKED), 0)
    fire_test_st.tarp = true
    expect_eq(fire_decide(fire_st, 5), FIRE_LIGHT)
  }

  test "it burns a minute a minute, runs low, and goes out as facts" (fire_st: mut FireState) {
    fresh(fire_st)
    light(fire_st)
    facts(fire_st)
    fire_run(fire_st, 1.5)
    expect(fire_fuel(fire_st) == 30.0)
    expect(not fire_low(fire_st))
    fire_run(fire_st, 0.3)
    expect(fire_low(fire_st))
    expect_eq(count(facts(fire_st), FIRE_LOW_FUEL), 1)
    fire_run(fire_st, 0.5)
    expect(not fire_lit(fire_st))
    expect(fire_fuel(fire_st) == 0.0)
    expect_eq(count(facts(fire_st), FIRE_WENT_OUT), 1)
  }

  test "the rain burns it twice as fast, and under a tarp it counts the hours" (fire_st: mut FireState, fire_test_st: mut FireTestState) {
    fresh(fire_st)
    light(fire_st)
    fire_test_st.wet = true
    fire_run(fire_st, 0.5)
    expect(fire_fuel(fire_st) == 60.0)
    fire_test_st.tarp = true
    fire_run(fire_st, 0.5)
    expect(fire_fuel(fire_st) == 30.0)
    expect(fire_rain_hours(fire_st) == 0.5)
    fire_morning(fire_st)
    expect(fire_rain_hours(fire_st) == 0.0)
  }

  test "a machine that does not own the world burns nothing, but is told" (fire_st: mut FireState, fire_test_st: mut FireTestState) {
    fresh(fire_st)
    light(fire_st)
    fire_test_st.owns = false
    fire_run(fire_st, 5.0)
    expect(fire_fuel(fire_st) == 120.0)
    facts(fire_st)
    fire_told(fire_st, false, 0.0, true)
    expect(not fire_lit(fire_st))
    expect_eq(count(facts(fire_st), FIRE_WENT_OUT), 1)
    fire_told(fire_st, true, 50.0, true)
    fire_told(fire_st, false, 0.0, false)
    expect_eq(q_len(fire_facts(fire_st)), 0)
  }

  test "it warms and cooks close, and only while lit" (fire_st: mut FireState) {
    fresh(fire_st)
    expect(not fire_warms(fire_st, 1.0))
    light(fire_st)
    expect(fire_warms(fire_st, 3.5))
    expect(not fire_warms(fire_st, 3.7))
    expect(fire_cooks(fire_st, 3.4))
    expect(not fire_cooks(fire_st, 3.55))
    fire_out(fire_st)
    expect(not fire_cooks(fire_st, 0.0))
  }

  test "a save section reads back the same fire" (fire_st: mut FireState, fire_test_st: mut FireTestState) {
    fresh(fire_st)
    light(fire_st)
    fire_test_st.wet = true
    fire_test_st.tarp = true
    fire_run(fire_st, 0.25)
    let root = save_tree()
    save_section(root, "fire", 1, fire_save(fire_st))
    let text = save_encode(root)
    fire_reset(fire_st)
    let n = load_section(save_decode(text), "fire")
    fire_load(fire_st, n.data, n.version)
    expect(fire_lit(fire_st))
    expect(fire_fuel(fire_st) == 105.0)
    expect(fire_rain_hours(fire_st) == 0.25)
  }
}