// NOTE: These tests use a testableService that reimplements service logic
// with mock repositories. This means tests can pass even if the real service
// diverges. For full coverage, consider refactoring services to use repository
// interfaces so the real service can be tested with mock repositories injected.

package player

import (
	"fmt"
	"testing"

	"gorm.io/gorm"
)

// ---------------------------------------------------------------------------
// Mock repository — mirrors the methods that Service calls on *Repository.
// ---------------------------------------------------------------------------

type repositoryInterface interface {
	Create(profile *PlayerProfile) error
	FindByUserID(userID uint) (*PlayerProfile, error)
	Update(profile *PlayerProfile) error
	UpdateStats(userID uint, updates map[string]interface{}) error
}

type testableService struct {
	repo         repositoryInterface
	userResolver func(username string) (uint, error)
}

func (s *testableService) GetProfile(userID uint) (*PlayerProfile, error) {
	profile, err := s.repo.FindByUserID(userID)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			profile = &PlayerProfile{UserID: userID}
			if createErr := s.repo.Create(profile); createErr != nil {
				return nil, fmt.Errorf("프로필 자동 생성에 실패했습니다: %w", createErr)
			}
			return profile, nil
		}
		return nil, fmt.Errorf("프로필 조회에 실패했습니다")
	}
	return profile, nil
}

func (s *testableService) UpdateProfile(userID uint, nickname string) (*PlayerProfile, error) {
	profile, err := s.repo.FindByUserID(userID)
	if err != nil {
		return nil, fmt.Errorf("프로필이 존재하지 않습니다")
	}
	if nickname != "" {
		profile.Nickname = nickname
	}
	if err := s.repo.Update(profile); err != nil {
		return nil, fmt.Errorf("프로필 수정에 실패했습니다")
	}
	return profile, nil
}

func (s *testableService) SaveGameData(userID uint, data *GameDataRequest) error {
	if err := validateGameData(data); err != nil {
		return err
	}

	updates := map[string]interface{}{}

	if data.Level != nil {
		updates["level"] = *data.Level
	}
	if data.Experience != nil {
		updates["experience"] = *data.Experience
	}
	if data.MaxHP != nil {
		updates["max_hp"] = *data.MaxHP
	}
	if data.MaxMP != nil {
		updates["max_mp"] = *data.MaxMP
	}
	if data.AttackPower != nil {
		updates["attack_power"] = *data.AttackPower
	}
	if data.AttackRange != nil {
		updates["attack_range"] = *data.AttackRange
	}
	if data.SprintMultiplier != nil {
		updates["sprint_multiplier"] = *data.SprintMultiplier
	}
	if data.LastPosX != nil {
		updates["last_pos_x"] = *data.LastPosX
	}
	if data.LastPosY != nil {
		updates["last_pos_y"] = *data.LastPosY
	}
	if data.LastPosZ != nil {
		updates["last_pos_z"] = *data.LastPosZ
	}
	if data.LastRotY != nil {
		updates["last_rot_y"] = *data.LastRotY
	}
	if data.PlayTimeDelta != nil {
		profile, err := s.repo.FindByUserID(userID)
		if err != nil {
			return fmt.Errorf("프로필이 존재하지 않습니다")
		}
		updates["total_play_time"] = profile.TotalPlayTime + *data.PlayTimeDelta
	}

	if len(updates) == 0 {
		return nil
	}

	return s.repo.UpdateStats(userID, updates)
}

func (s *testableService) GetProfileByUsername(username string) (*PlayerProfile, error) {
	if s.userResolver == nil {
		return nil, fmt.Errorf("userResolver가 설정되지 않았습니다")
	}
	userID, err := s.userResolver(username)
	if err != nil {
		return nil, fmt.Errorf("존재하지 않는 유저입니다")
	}
	return s.GetProfile(userID)
}

// ---------------------------------------------------------------------------
// Mock implementation
// ---------------------------------------------------------------------------

type mockRepo struct {
	profiles       map[uint]*PlayerProfile
	nextID         uint
	createErr      error
	updateErr      error
	updateStatsErr error
}

func newMockRepo() *mockRepo {
	return &mockRepo{
		profiles: make(map[uint]*PlayerProfile),
		nextID:   1,
	}
}

func (m *mockRepo) Create(profile *PlayerProfile) error {
	if m.createErr != nil {
		return m.createErr
	}
	profile.ID = m.nextID
	profile.Level = 1
	profile.MaxHP = 100
	profile.MaxMP = 50
	profile.AttackPower = 10
	profile.AttackRange = 3
	profile.SprintMultiplier = 1.8
	m.nextID++
	stored := *profile
	m.profiles[profile.UserID] = &stored
	return nil
}

func (m *mockRepo) FindByUserID(userID uint) (*PlayerProfile, error) {
	p, ok := m.profiles[userID]
	if !ok {
		return nil, gorm.ErrRecordNotFound
	}
	cp := *p
	return &cp, nil
}

func (m *mockRepo) Update(profile *PlayerProfile) error {
	if m.updateErr != nil {
		return m.updateErr
	}
	stored := *profile
	m.profiles[profile.UserID] = &stored
	return nil
}

func (m *mockRepo) UpdateStats(userID uint, updates map[string]interface{}) error {
	if m.updateStatsErr != nil {
		return m.updateStatsErr
	}
	p, ok := m.profiles[userID]
	if !ok {
		return gorm.ErrRecordNotFound
	}
	for key, val := range updates {
		switch key {
		case "level":
			p.Level = val.(int)
		case "experience":
			p.Experience = val.(int)
		case "max_hp":
			p.MaxHP = val.(float64)
		case "max_mp":
			p.MaxMP = val.(float64)
		case "attack_power":
			p.AttackPower = val.(float64)
		case "attack_range":
			p.AttackRange = val.(float64)
		case "sprint_multiplier":
			p.SprintMultiplier = val.(float64)
		case "last_pos_x":
			p.LastPosX = val.(float64)
		case "last_pos_y":
			p.LastPosY = val.(float64)
		case "last_pos_z":
			p.LastPosZ = val.(float64)
		case "last_rot_y":
			p.LastRotY = val.(float64)
		case "total_play_time":
			p.TotalPlayTime = val.(int64)
		}
	}
	return nil
}

// seedProfile creates a profile for a given userID in the mock repo.
func seedProfile(repo *mockRepo, userID uint, nickname string) *PlayerProfile {
	p := &PlayerProfile{UserID: userID, Nickname: nickname}
	_ = repo.Create(p)
	return repo.profiles[userID]
}

// ---------------------------------------------------------------------------
// Tests — GetProfile
// ---------------------------------------------------------------------------

func TestGetProfile_Success(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}

	seedProfile(repo, 1, "player1")

	profile, err := svc.GetProfile(1)
	if err != nil {
		t.Fatalf("GetProfile failed: %v", err)
	}
	if profile.UserID != 1 {
		t.Errorf("UserID = %d, want 1", profile.UserID)
	}
	if profile.Nickname != "player1" {
		t.Errorf("Nickname = %q, want %q", profile.Nickname, "player1")
	}
}

func TestGetProfile_NotFound_AutoCreates(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}

	profile, err := svc.GetProfile(42)
	if err != nil {
		t.Fatalf("GetProfile should auto-create, got error: %v", err)
	}
	if profile.UserID != 42 {
		t.Errorf("UserID = %d, want 42", profile.UserID)
	}
	if profile.Level != 1 {
		t.Errorf("Level = %d, want 1 (default)", profile.Level)
	}
}

func TestGetProfile_AutoCreateFails(t *testing.T) {
	repo := newMockRepo()
	repo.createErr = fmt.Errorf("db error")
	svc := &testableService{repo: repo}

	_, err := svc.GetProfile(42)
	if err == nil {
		t.Error("expected error when auto-create fails, got nil")
	}
}

// ---------------------------------------------------------------------------
// Tests — GetProfileByUsername
// ---------------------------------------------------------------------------

func TestGetProfileByUsername_Success(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{
		repo: repo,
		userResolver: func(username string) (uint, error) {
			if username == "testuser" {
				return 1, nil
			}
			return 0, fmt.Errorf("not found")
		},
	}
	seedProfile(repo, 1, "testuser")

	profile, err := svc.GetProfileByUsername("testuser")
	if err != nil {
		t.Fatalf("GetProfileByUsername failed: %v", err)
	}
	if profile.UserID != 1 {
		t.Errorf("UserID = %d, want 1", profile.UserID)
	}
}

func TestGetProfileByUsername_UserNotFound(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{
		repo: repo,
		userResolver: func(username string) (uint, error) {
			return 0, fmt.Errorf("not found")
		},
	}

	_, err := svc.GetProfileByUsername("unknown")
	if err == nil {
		t.Error("expected error for unknown username, got nil")
	}
}

func TestGetProfileByUsername_NoResolver(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}

	_, err := svc.GetProfileByUsername("anyone")
	if err == nil {
		t.Error("expected error when userResolver is nil, got nil")
	}
}

// ---------------------------------------------------------------------------
// Tests — UpdateProfile
// ---------------------------------------------------------------------------

func TestUpdateProfile_Success(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "old_nick")

	profile, err := svc.UpdateProfile(1, "new_nick")
	if err != nil {
		t.Fatalf("UpdateProfile failed: %v", err)
	}
	if profile.Nickname != "new_nick" {
		t.Errorf("Nickname = %q, want %q", profile.Nickname, "new_nick")
	}
}

func TestUpdateProfile_EmptyNickname_KeepsExisting(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "keep_me")

	profile, err := svc.UpdateProfile(1, "")
	if err != nil {
		t.Fatalf("UpdateProfile failed: %v", err)
	}
	if profile.Nickname != "keep_me" {
		t.Errorf("Nickname = %q, want %q (should be unchanged)", profile.Nickname, "keep_me")
	}
}

func TestUpdateProfile_NotFound(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}

	_, err := svc.UpdateProfile(999, "nick")
	if err == nil {
		t.Error("expected error updating non-existent profile, got nil")
	}
}

func TestUpdateProfile_RepoError(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "nick")

	repo.updateErr = fmt.Errorf("db error")
	_, err := svc.UpdateProfile(1, "new_nick")
	if err == nil {
		t.Error("expected error when repo update fails, got nil")
	}
}

// ---------------------------------------------------------------------------
// Tests — SaveGameData
// ---------------------------------------------------------------------------

func intPtr(v int) *int          { return &v }
func float64Ptr(v float64) *float64 { return &v }
func int64Ptr(v int64) *int64    { return &v }

func TestSaveGameData_Success(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "player1")

	err := svc.SaveGameData(1, &GameDataRequest{
		Level:      intPtr(5),
		Experience: intPtr(200),
		MaxHP:      float64Ptr(150),
		LastPosX:   float64Ptr(10.5),
		LastPosY:   float64Ptr(20.0),
		LastPosZ:   float64Ptr(30.0),
	})
	if err != nil {
		t.Fatalf("SaveGameData failed: %v", err)
	}

	p := repo.profiles[1]
	if p.Level != 5 {
		t.Errorf("Level = %d, want 5", p.Level)
	}
	if p.Experience != 200 {
		t.Errorf("Experience = %d, want 200", p.Experience)
	}
	if p.MaxHP != 150 {
		t.Errorf("MaxHP = %f, want 150", p.MaxHP)
	}
	if p.LastPosX != 10.5 {
		t.Errorf("LastPosX = %f, want 10.5", p.LastPosX)
	}
}

func TestSaveGameData_EmptyRequest(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "player1")

	err := svc.SaveGameData(1, &GameDataRequest{})
	if err != nil {
		t.Fatalf("SaveGameData with empty request should succeed: %v", err)
	}
}

func TestSaveGameData_PlayTimeDelta(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "player1")
	repo.profiles[1].TotalPlayTime = 1000

	err := svc.SaveGameData(1, &GameDataRequest{
		PlayTimeDelta: int64Ptr(300),
	})
	if err != nil {
		t.Fatalf("SaveGameData failed: %v", err)
	}

	p := repo.profiles[1]
	if p.TotalPlayTime != 1300 {
		t.Errorf("TotalPlayTime = %d, want 1300 (1000+300)", p.TotalPlayTime)
	}
}

func TestSaveGameData_PlayTimeDelta_Accumulates(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "player1")

	_ = svc.SaveGameData(1, &GameDataRequest{PlayTimeDelta: int64Ptr(100)})
	_ = svc.SaveGameData(1, &GameDataRequest{PlayTimeDelta: int64Ptr(200)})

	p := repo.profiles[1]
	if p.TotalPlayTime != 300 {
		t.Errorf("TotalPlayTime = %d, want 300 (0+100+200)", p.TotalPlayTime)
	}
}

func TestSaveGameData_PlayTimeDelta_ProfileNotFound(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}

	err := svc.SaveGameData(999, &GameDataRequest{PlayTimeDelta: int64Ptr(100)})
	if err == nil {
		t.Error("expected error when profile not found for PlayTimeDelta, got nil")
	}
}

// ---------------------------------------------------------------------------
// Tests — SaveGameData validation
// ---------------------------------------------------------------------------

func TestSaveGameData_InvalidLevel(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "player1")

	err := svc.SaveGameData(1, &GameDataRequest{Level: intPtr(0)})
	if err == nil {
		t.Error("expected error for level=0, got nil")
	}

	err = svc.SaveGameData(1, &GameDataRequest{Level: intPtr(1000)})
	if err == nil {
		t.Error("expected error for level=1000, got nil")
	}
}

func TestSaveGameData_NegativeExperience(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "player1")

	err := svc.SaveGameData(1, &GameDataRequest{Experience: intPtr(-1)})
	if err == nil {
		t.Error("expected error for negative experience, got nil")
	}
}

func TestSaveGameData_NegativePlayTimeDelta(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "player1")

	err := svc.SaveGameData(1, &GameDataRequest{PlayTimeDelta: int64Ptr(-100)})
	if err == nil {
		t.Error("expected error for negative playTimeDelta, got nil")
	}
}

func TestSaveGameData_MaxHP_OutOfRange(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "player1")

	err := svc.SaveGameData(1, &GameDataRequest{MaxHP: float64Ptr(0)})
	if err == nil {
		t.Error("expected error for maxHP=0, got nil")
	}

	err = svc.SaveGameData(1, &GameDataRequest{MaxHP: float64Ptr(1000000)})
	if err == nil {
		t.Error("expected error for maxHP=1000000, got nil")
	}
}

func TestSaveGameData_RepoError(t *testing.T) {
	repo := newMockRepo()
	svc := &testableService{repo: repo}
	seedProfile(repo, 1, "player1")

	repo.updateStatsErr = fmt.Errorf("db write error")
	err := svc.SaveGameData(1, &GameDataRequest{Level: intPtr(5)})
	if err == nil {
		t.Error("expected error when repo UpdateStats fails, got nil")
	}
}