package auth

import (
	"context"
	"testing"
)

func TestManager_Update_PreservesModelStates(t *testing.T) {
	m := NewManager(nil, nil, nil)

	model := "test-model"
	backoffLevel := 7

	if _, errRegister := m.Register(context.Background(), &Auth{
		ID:       "auth-1",
		Provider: "claude",
		Metadata: map[string]any{"k": "v"},
		ModelStates: map[string]*ModelState{
			model: {
				Quota: QuotaState{BackoffLevel: backoffLevel},
			},
		},
	}); errRegister != nil {
		t.Fatalf("register auth: %v", errRegister)
	}

	if _, errUpdate := m.Update(context.Background(), &Auth{
		ID:       "auth-1",
		Provider: "claude",
		Metadata: map[string]any{"k": "v2"},
	}); errUpdate != nil {
		t.Fatalf("update auth: %v", errUpdate)
	}

	updated, ok := m.GetByID("auth-1")
	if !ok || updated == nil {
		t.Fatalf("expected auth to be present")
	}
	if len(updated.ModelStates) == 0 {
		t.Fatalf("expected ModelStates to be preserved")
	}
	state := updated.ModelStates[model]
	if state == nil {
		t.Fatalf("expected model state to be present")
	}
	if state.Quota.BackoffLevel != backoffLevel {
		t.Fatalf("expected BackoffLevel to be %d, got %d", backoffLevel, state.Quota.BackoffLevel)
	}
}

func TestManager_Update_DisabledExistingDoesNotInheritModelStates(t *testing.T) {
	m := NewManager(nil, nil, nil)

	// Register a disabled auth with existing ModelStates.
	if _, err := m.Register(context.Background(), &Auth{
		ID:       "auth-disabled",
		Provider: "claude",
		Disabled: true,
		Status:   StatusDisabled,
		ModelStates: map[string]*ModelState{
			"stale-model": {
				Quota: QuotaState{BackoffLevel: 5},
			},
		},
	}); err != nil {
		t.Fatalf("register auth: %v", err)
	}

	// Update with empty ModelStates — should NOT inherit stale states.
	if _, err := m.Update(context.Background(), &Auth{
		ID:       "auth-disabled",
		Provider: "claude",
		Disabled: true,
		Status:   StatusDisabled,
	}); err != nil {
		t.Fatalf("update auth: %v", err)
	}

	updated, ok := m.GetByID("auth-disabled")
	if !ok || updated == nil {
		t.Fatalf("expected auth to be present")
	}
	if len(updated.ModelStates) != 0 {
		t.Fatalf("expected disabled auth NOT to inherit ModelStates, got %d entries", len(updated.ModelStates))
	}
}

func TestManager_Update_ActiveToDisabledDoesNotInheritModelStates(t *testing.T) {
	m := NewManager(nil, nil, nil)

	// Register an active auth with ModelStates (simulates existing live auth).
	if _, err := m.Register(context.Background(), &Auth{
		ID:       "auth-a2d",
		Provider: "claude",
		Status:   StatusActive,
		ModelStates: map[string]*ModelState{
			"stale-model": {
				Quota: QuotaState{BackoffLevel: 9},
			},
		},
	}); err != nil {
		t.Fatalf("register auth: %v", err)
	}

	// File watcher deletes config → synthesizes Disabled=true auth → Update.
	// Even though existing is active, incoming auth is disabled → skip inheritance.
	if _, err := m.Update(context.Background(), &Auth{
		ID:       "auth-a2d",
		Provider: "claude",
		Disabled: true,
		Status:   StatusDisabled,
	}); err != nil {
		t.Fatalf("update auth: %v", err)
	}

	updated, ok := m.GetByID("auth-a2d")
	if !ok || updated == nil {
		t.Fatalf("expected auth to be present")
	}
	if len(updated.ModelStates) != 0 {
		t.Fatalf("expected active→disabled transition NOT to inherit ModelStates, got %d entries", len(updated.ModelStates))
	}
}

func TestManager_Update_DisabledToActiveDoesNotInheritStaleModelStates(t *testing.T) {
	m := NewManager(nil, nil, nil)

	// Register a disabled auth with stale ModelStates.
	if _, err := m.Register(context.Background(), &Auth{
		ID:       "auth-d2a",
		Provider: "claude",
		Disabled: true,
		Status:   StatusDisabled,
		ModelStates: map[string]*ModelState{
			"stale-model": {
				Quota: QuotaState{BackoffLevel: 4},
			},
		},
	}); err != nil {
		t.Fatalf("register auth: %v", err)
	}

	// Re-enable: incoming auth is active, existing is disabled → skip inheritance.
	if _, err := m.Update(context.Background(), &Auth{
		ID:       "auth-d2a",
		Provider: "claude",
		Status:   StatusActive,
	}); err != nil {
		t.Fatalf("update auth: %v", err)
	}

	updated, ok := m.GetByID("auth-d2a")
	if !ok || updated == nil {
		t.Fatalf("expected auth to be present")
	}
	if len(updated.ModelStates) != 0 {
		t.Fatalf("expected disabled→active transition NOT to inherit stale ModelStates, got %d entries", len(updated.ModelStates))
	}
}

func TestManager_Update_ActiveInheritsModelStates(t *testing.T) {
	m := NewManager(nil, nil, nil)

	model := "active-model"
	backoffLevel := 3

	// Register an active auth with ModelStates.
	if _, err := m.Register(context.Background(), &Auth{
		ID:       "auth-active",
		Provider: "claude",
		Status:   StatusActive,
		ModelStates: map[string]*ModelState{
			model: {
				Quota: QuotaState{BackoffLevel: backoffLevel},
			},
		},
	}); err != nil {
		t.Fatalf("register auth: %v", err)
	}

	// Update with empty ModelStates — both sides active → SHOULD inherit.
	if _, err := m.Update(context.Background(), &Auth{
		ID:       "auth-active",
		Provider: "claude",
		Status:   StatusActive,
	}); err != nil {
		t.Fatalf("update auth: %v", err)
	}

	updated, ok := m.GetByID("auth-active")
	if !ok || updated == nil {
		t.Fatalf("expected auth to be present")
	}
	if len(updated.ModelStates) == 0 {
		t.Fatalf("expected active auth to inherit ModelStates")
	}
	state := updated.ModelStates[model]
	if state == nil {
		t.Fatalf("expected model state to be present")
	}
	if state.Quota.BackoffLevel != backoffLevel {
		t.Fatalf("expected BackoffLevel to be %d, got %d", backoffLevel, state.Quota.BackoffLevel)
	}
}