package game

import (
	"testing"
	"time"

	"github.com/denisovdennis/autohero/internal/model"
)

func TestSimulateOneFight_HeroSurvives(t *testing.T) {
	hero := &model.Hero{
		Level: 1, XP: 0,
		MaxHP: 10000, HP: 10000,
		Attack: 100, Defense: 60, Speed: 1.0,
		Strength: 10, Constitution: 10, Agility: 10, Luck: 5,
		State: model.StateWalking,
	}

	now := time.Now()
	survived, enemy, xpGained, goldGained := SimulateOneFight(hero, now, nil, nil, 100*time.Millisecond, VictoryRewardDeps{})

	if !survived {
		t.Fatalf("overpowered hero should survive, enemy was %s", enemy.Name)
	}
	if xpGained <= 0 {
		t.Fatal("expected positive XP gain")
	}
	if goldGained <= 0 {
		t.Fatal("expected positive gold gain")
	}
	if enemy.Name == "" {
		t.Fatal("expected enemy with a name")
	}
}

func TestSimulateOneFight_HeroDies(t *testing.T) {
	hero := &model.Hero{
		Level: 1, XP: 0,
		MaxHP: 1, HP: 1,
		Attack: 1, Defense: 0, Speed: 1.0,
		State: model.StateWalking,
	}

	now := time.Now()
	survived, _, _, _ := SimulateOneFight(hero, now, nil, nil, 100*time.Millisecond, VictoryRewardDeps{})

	if survived {
		t.Fatal("1 HP hero should die to any enemy")
	}
	if hero.HP != 0 {
		t.Fatalf("expected HP 0 after death, got %d", hero.HP)
	}
	if hero.State != model.StateDead {
		t.Fatalf("expected state dead, got %s", hero.State)
	}
}

func TestSimulateOneFight_LevelUp(t *testing.T) {
	// Seed XP just below L1->L2 threshold (100 XP with default tuning).
	hero := &model.Hero{
		Level: 1, XP: 99,
		MaxHP: 10000, HP: 10000,
		Attack: 100, Defense: 60, Speed: 1.0,
		Strength: 10, Constitution: 10, Agility: 10, Luck: 5,
		State: model.StateWalking,
	}

	now := time.Now()
	survived, _, xpGained, _ := SimulateOneFight(hero, now, nil, nil, 100*time.Millisecond, VictoryRewardDeps{})

	if !survived {
		t.Fatal("overpowered hero should survive")
	}
	if xpGained <= 0 {
		t.Fatal("expected XP gain")
	}
	if hero.Level < 2 {
		t.Fatalf("expected level 2+ after gaining %d XP from 99 base, got level %d", xpGained, hero.Level)
	}
}

func TestBuildEnemyInstanceForLevel_XPPerLevelRampsFrom10(t *testing.T) {
	tmpl := model.Enemy{
		BaseLevel:  1,
		XPReward:   1,
		XPPerLevel: 4,
		IsElite:    false,
	}
	early := BuildEnemyInstanceForLevel(tmpl, 6)
	if early.XPReward != 1 {
		t.Fatalf("normal mob instance L6: want base XP only (no per-level ramp), got %d", early.XPReward)
	}
	mid := BuildEnemyInstanceForLevel(tmpl, 12)
	if mid.XPReward <= 1 {
		t.Fatalf("normal mob instance L12: want xp_per_level applied, got %d", mid.XPReward)
	}
	elite := tmpl
	elite.IsElite = true
	el := BuildEnemyInstanceForLevel(elite, 5)
	if el.XPReward <= 1 {
		t.Fatalf("elite instance L5: want xp_per_level even before 10, got %d", el.XPReward)
	}
}

func TestOfflineAutoPotionHook_DoesNotTriggerWhenHealthy(t *testing.T) {
	hero := &model.Hero{
		MaxHP:   100,
		HP:      100,
		Potions: 3,
	}
	if used := OfflineAutoPotionHook(hero, time.Now()); used {
		t.Fatal("expected no potion usage when hero is above threshold")
	}
	if hero.Potions != 3 {
		t.Fatalf("expected potions unchanged, got %d", hero.Potions)
	}
}

func TestPickEnemyForLevel(t *testing.T) {
	tests := []struct {
		level int
	}{
		{1}, {5}, {10}, {20}, {50},
	}

	for _, tt := range tests {
		enemy := PickEnemyForLevel(tt.level)
		if enemy.Name == "" {
			t.Errorf("PickEnemyForLevel(%d) returned enemy with empty name", tt.level)
		}
		if enemy.MaxHP <= 0 {
			t.Errorf("PickEnemyForLevel(%d) returned enemy with MaxHP=%d", tt.level, enemy.MaxHP)
		}
		if enemy.HP != enemy.MaxHP {
			t.Errorf("PickEnemyForLevel(%d) returned enemy with HP=%d != MaxHP=%d", tt.level, enemy.HP, enemy.MaxHP)
		}
	}
}

func TestScaleEnemyTemplate(t *testing.T) {
	tmpl, ok := model.EnemyTemplates[model.EnemyWolf]
	if !ok {
		tmpl = model.Enemy{
			Type:             model.EnemyWolf,
			Name:             "Forest Wolf",
			MaxHP:            40,
			HP:               40,
			Attack:           8,
			Defense:          2,
			Speed:            1.2,
			BaseLevel:        1,
			LevelVariance:    0.3,
			MaxHeroLevelDiff: 5,
			HPPerLevel:       5,
			AttackPerLevel:   1.5,
			DefensePerLevel:  1.0,
		}
	}
	scaled := ScaleEnemyTemplate(tmpl, 5)

	if scaled.MaxHP <= tmpl.MaxHP {
		t.Errorf("scaled MaxHP %d should exceed base %d at level 5", scaled.MaxHP, tmpl.MaxHP)
	}
	if scaled.HP != scaled.MaxHP {
		t.Errorf("scaled HP %d should equal MaxHP %d", scaled.HP, scaled.MaxHP)
	}
}