package main

import "testing"

// Golden values cross-checked against the Python _combat_session_delta /
// _combat_merge_into_lifetime on identical input (see compare run). Folds two
// cumulative snapshots; the first is treated as the whole delta.
func TestCombatMerge(t *testing.T) {
	snap1 := map[string]any{
		"total_damage_given": 100.0, "total_kills": 2.0,
		"monsters": map[string]any{
			"Drudge": map[string]any{
				"name": "Drudge", "kill_count": 2.0, "damage_given": 100.0,
				"offense": map[string]any{"melee": map[string]any{"slashing": map[string]any{
					"total_attacks": 10.0, "max_normal_damage": 15.0,
				}}},
			},
		},
	}
	snap2 := map[string]any{
		"total_damage_given": 250.0, "total_kills": 5.0,
		"monsters": map[string]any{
			"Drudge": map[string]any{
				"name": "Drudge", "kill_count": 4.0, "damage_given": 200.0,
				"offense": map[string]any{"melee": map[string]any{"slashing": map[string]any{
					"total_attacks": 20.0, "max_normal_damage": 18.0,
				}}},
			},
		},
	}

	lifetime := map[string]any{}
	lifetime = combatMergeIntoLifetime(lifetime, snap1) // first = whole delta
	lifetime = combatMergeIntoLifetime(lifetime, combatSessionDelta(snap2, snap1))

	if got := num(lifetime["total_kills"]); got != 5 {
		t.Errorf("total_kills = %v, want 5", got)
	}
	if got := num(lifetime["total_damage_given"]); got != 250 {
		t.Errorf("total_damage_given = %v, want 250", got)
	}
	drudge := asMap(asMap(lifetime["monsters"])["Drudge"])
	if got := num(drudge["kill_count"]); got != 4 {
		t.Errorf("Drudge.kill_count = %v, want 4", got)
	}
	slashing := asMap(asMap(asMap(drudge["offense"])["melee"])["slashing"])
	// offense uses the latest snapshot additively (the documented quirk): 10 + 20.
	if got := num(slashing["total_attacks"]); got != 30 {
		t.Errorf("offense slashing total_attacks = %v, want 30 (latest-additive quirk)", got)
	}
	if got := num(slashing["max_normal_damage"]); got != 18 {
		t.Errorf("offense slashing max_normal_damage = %v, want 18 (max)", got)
	}
}