package governance

import (
	"context"
	"strings"
	"testing"
	"time"
)

func TestNewClientRequiresAddress(t *testing.T) {
	_, err := NewClient(Config{})
	if err == nil {
		t.Fatal("expected error for empty governance address")
	}
}

func TestNewClientAcceptsValidConfig(t *testing.T) {
	c, err := NewClient(Config{GovernanceAddr: "localhost:50051"})
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if c == nil {
		t.Fatal("client should not be nil")
	}
}

// S-19: mTLS config tests

func TestNewClientRequiresTLSWhenFlagged(t *testing.T) {
	_, err := NewClient(Config{
		GovernanceAddr: "localhost:50051",
		TLSRequired:    true,
	})
	if err == nil {
		t.Fatal("expected error when TLS required but paths missing")
	}
	if !strings.Contains(err.Error(), "TLS is required") {
		t.Errorf("expected TLS error, got: %v", err)
	}
}

func TestNewClientAcceptsNoTLSWhenNotRequired(t *testing.T) {
	c, err := NewClient(Config{
		GovernanceAddr: "localhost:50051",
		TLSRequired:    false,
	})
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if c == nil {
		t.Fatal("client should not be nil")
	}
}

func TestNewClientAcceptsTLSConfig(t *testing.T) {
	c, err := NewClient(Config{
		GovernanceAddr: "localhost:50051",
		TLSRequired:    true,
		TLSCertPath:    "/path/to/cert.pem",
		TLSKeyPath:     "/path/to/key.pem",
		TLSCAPath:      "/path/to/ca.pem",
	})
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if c == nil {
		t.Fatal("client should not be nil")
	}
}

// S-10: RedeemResult.IsExpired tests

func TestRedeemResultIsExpired(t *testing.T) {
	r := &RedeemResult{
		ExpiresAt: time.Now().Add(-1 * time.Minute),
	}
	if !r.IsExpired() {
		t.Error("expected expired for past time")
	}
}

func TestRedeemResultNotExpired(t *testing.T) {
	r := &RedeemResult{
		ExpiresAt: time.Now().Add(1 * time.Hour),
	}
	if r.IsExpired() {
		t.Error("expected not expired for future time")
	}
}

func TestRedeemResultZeroTimeNotExpired(t *testing.T) {
	r := &RedeemResult{}
	if r.IsExpired() {
		t.Error("expected not expired for zero time")
	}
}

// S-03: NotarizeCredentialEvent tests

func TestNotarizeCredentialEventRequiresFingerprint(t *testing.T) {
	c, _ := NewClient(Config{GovernanceAddr: "localhost:50051"})
	err := c.NotarizeCredentialEvent(context.Background(), CredentialEvent{
		EventType: "issue",
		IntentID:  "abc123",
	})
	if err == nil {
		t.Fatal("expected error for missing fingerprint")
	}
	if !strings.Contains(err.Error(), "credential_fingerprint") {
		t.Errorf("expected fingerprint error, got: %v", err)
	}
}

func TestNotarizeCredentialEventRequiresIntentID(t *testing.T) {
	c, _ := NewClient(Config{GovernanceAddr: "localhost:50051"})
	err := c.NotarizeCredentialEvent(context.Background(), CredentialEvent{
		EventType:             "issue",
		CredentialFingerprint: "abcdef0123456789",
	})
	if err == nil {
		t.Fatal("expected error for missing intent_id")
	}
	if !strings.Contains(err.Error(), "intent_id") {
		t.Errorf("expected intent_id error, got: %v", err)
	}
}

func TestNotarizeCredentialEventRequiresEventType(t *testing.T) {
	c, _ := NewClient(Config{GovernanceAddr: "localhost:50051"})
	err := c.NotarizeCredentialEvent(context.Background(), CredentialEvent{
		IntentID:              "abc123",
		CredentialFingerprint: "abcdef0123456789",
	})
	if err == nil {
		t.Fatal("expected error for missing event_type")
	}
	if !strings.Contains(err.Error(), "event_type") {
		t.Errorf("expected event_type error, got: %v", err)
	}
}

// S-03: VerifyCredentialGovernance tests

func TestVerifyCredentialGovernanceNoIntent(t *testing.T) {
	c, _ := NewClient(Config{GovernanceAddr: "localhost:50051"})
	result, err := c.VerifyCredentialGovernance(context.Background(), CredentialVerification{})
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if result.Governed {
		t.Error("expected Governed=false for empty intent")
	}
}

func TestVerifyCredentialGovernanceRequiresPublicKey(t *testing.T) {
	c, _ := NewClient(Config{GovernanceAddr: "localhost:50051"})
	_, err := c.VerifyCredentialGovernance(context.Background(), CredentialVerification{
		IntentID: "abc123",
	})
	if err == nil {
		t.Fatal("expected error for missing public key")
	}
	if !strings.Contains(err.Error(), "certificate public key") {
		t.Errorf("expected public key error, got: %v", err)
	}
}