package main

import (
	"math"
	"testing"
)

func approx(a, b float64) bool { return math.Abs(a-b) < 0.01 }

// Wand: OD = (buffedElemVsMonsters - tableMaxElemVsMonsters) * 100.
// Live "Frost Baton": skill 34 (war), wieldreq 385, ElemVsMonsters 1.40,
// no spirit-drinker spells. Table max for (34,*,*,385) = 1.18 → OD = +22.
func TestOD_Wand(t *testing.T) {
	raw := map[string]any{
		"ObjectClass": 31.0,
		"IntValues":   map[string]any{"159": 34.0, "160": 385.0},
		"DoubleValues": map[string]any{"152": 1.40, "167772169": 8.0},
		"Spells": []any{}, "ActiveSpells": []any{},
	}
	od, ok := computeOD(raw)
	if !ok || !approx(od, 22.0) {
		t.Fatalf("wand OD = %v ok=%v, want +22", od, ok)
	}
}

// Non-loot (no workmanship) → no OD.
func TestOD_NonLootNull(t *testing.T) {
	raw := map[string]any{
		"ObjectClass":  31.0,
		"IntValues":    map[string]any{"159": 34.0, "160": 385.0},
		"DoubleValues": map[string]any{"152": 1.40},
		"Spells":       []any{}, "ActiveSpells": []any{},
	}
	if _, ok := computeOD(raw); ok {
		t.Fatal("no-workmanship item must have no OD")
	}
}

// Table lookup miss (unknown tier) → no OD.
func TestOD_UnknownTierNull(t *testing.T) {
	raw := map[string]any{
		"ObjectClass":  31.0,
		"IntValues":    map[string]any{"159": 34.0, "160": 999.0},
		"DoubleValues": map[string]any{"152": 1.40, "167772169": 8.0},
		"Spells":       []any{}, "ActiveSpells": []any{},
	}
	if _, ok := computeOD(raw); ok {
		t.Fatal("unknown wieldreq tier must have no OD")
	}
}

// Melee: OD = buffedMaxDmg - varianceTinks - tableMaxDmg,
// varianceTinks = round(log(tableMaxVar/variance)/log(0.8), 2).
// Heavy (44) sword (2) non-MS, wieldreq 430: tableMaxDmg=71, tableMaxVar=0.47.
// A perfect retail-max item: maxDmg 71, variance 0.47 → varianceTinks=0 → OD 0.
func TestOD_MeleeRetailMaxIsZero(t *testing.T) {
	raw := map[string]any{
		"ObjectClass":  1.0,
		"IntValues":    map[string]any{"159": 44.0, "353": 2.0, "160": 430.0, "218103842": 71.0},
		"DoubleValues": map[string]any{"167772171": 0.47, "167772169": 10.0},
		"Spells":       []any{}, "ActiveSpells": []any{},
	}
	od, ok := computeOD(raw)
	if !ok || !approx(od, 0.0) {
		t.Fatalf("melee retail-max OD = %v ok=%v, want 0", od, ok)
	}
}

// Melee with tighter variance (0.376 = one granite tink below 0.47):
// varianceTinks = round(log(0.47/0.376)/log(0.8), 2) = round(1.00,2)=1 → OD = 71-1-71 = -1.
func TestOD_MeleeOneTinkVariance(t *testing.T) {
	raw := map[string]any{
		"ObjectClass":  1.0,
		"IntValues":    map[string]any{"159": 44.0, "353": 2.0, "160": 430.0, "218103842": 71.0},
		"DoubleValues": map[string]any{"167772171": 0.376, "167772169": 10.0},
		"Spells":       []any{}, "ActiveSpells": []any{},
	}
	od, ok := computeOD(raw)
	if !ok || !approx(od, -1.0) {
		t.Fatalf("melee OD = %v ok=%v, want -1", od, ok)
	}
}

// Melee buffed: innate Legendary Blood Thirst (id 6089, +10 MaxDamage).
// maxDmg 61 + 10 = 71, variance 0.47 → OD 0 (vs 71 table).
func TestOD_MeleeBuffedByBloodThirst(t *testing.T) {
	raw := map[string]any{
		"ObjectClass":  1.0,
		"IntValues":    map[string]any{"159": 44.0, "353": 2.0, "160": 430.0, "218103842": 61.0},
		"DoubleValues": map[string]any{"167772171": 0.47, "167772169": 10.0},
		"Spells":       []any{6089.0}, "ActiveSpells": []any{},
	}
	od, ok := computeOD(raw)
	if !ok || !approx(od, 0.0) {
		t.Fatalf("melee buffed OD = %v ok=%v, want 0", od, ok)
	}
}