package services

import (
	"context"
	"encoding/base64"
	"io"
	"regexp"
	"strings"
	"testing"

	"gopkg.in/yaml.v3"
	"lokistack/models"
)

func TestRedactLokiYAML(t *testing.T) {
	source := "storage_config:\n  aws:\n    bucketnames: loki\n    access_key_id: ENC:private-access\n    secret_access_key: private-secret\nlimits_config:\n  retention_period: 720h\n"
	got, err := redactLokiYAML(source)
	if err != nil {
		t.Fatal(err)
	}
	for _, secret := range []string{"private-access", "private-secret", "ENC:"} {
		if strings.Contains(got, secret) {
			t.Fatalf("sensitive value remains in config: %s", secret)
		}
	}
	for _, want := range []string{"bucketnames: loki", "retention_period: 720h", "access_key_id: '********'"} {
		if !strings.Contains(got, want) {
			t.Fatalf("missing %q in sanitized config: %s", want, got)
		}
	}
}

func TestMinIOConfigUsesBucketNameNotPathPrefix(t *testing.T) {
	d := NewLokiDeployer(&models.LokiDeployment{StorageConfig: &models.StorageConfig{
		StorageType: "minio", Bucket: "logs-bucket", PathPrefix: "wrong-prefix", Endpoint: "http://minio:9000",
		AccessKey: "key", SecretKey: "secret", Insecure: true,
	}}, nil)
	config := d.generateLokiConfig()
	if count := strings.Count(config, "bucketnames: logs-bucket"); count != 2 {
		t.Fatalf("bucket name should appear in storage and ruler config; got %d", count)
	}
	if strings.Contains(config, "wrong-prefix") || strings.Contains(config, "s3://") {
		t.Fatalf("invalid S3 URL or path prefix in generated config")
	}
}

func TestDeployRejectsUndecryptedStorageCredential(t *testing.T) {
	d := NewLokiDeployer(&models.LokiDeployment{StorageConfig: &models.StorageConfig{
		StorageType: "minio", AccessKey: "ENC:unavailable", SecretKey: "secret",
	}}, nil)
	if err := d.Deploy(context.Background()); err == nil || !strings.Contains(err.Error(), "存储凭证解密失败") {
		t.Fatalf("expected credential failure, got %v", err)
	}
}

func TestGeneratedLokiConfigKeepsRequiredSettingsWithoutDefaults(t *testing.T) {
	d := NewLokiDeployer(&models.LokiDeployment{RetentionDays: 90, Replicas: 1, StorageConfig: &models.StorageConfig{
		StorageType: "minio", Bucket: "logs", Endpoint: "http://minio:9000",
		AccessKey: "key", SecretKey: "secret", Insecure: true,
	}}, nil)
	config := d.generateLokiConfig()
	var parsed map[string]interface{}
	if err := yaml.Unmarshal([]byte(config), &parsed); err != nil {
		t.Fatalf("invalid Loki YAML: %v", err)
	}
	// 注意 delete_request_store 用的是 filesystem 而不是 s3：
	// loki_config.go 里对 s3/oss/minio/cos/obs 刻意把 compactor 的删除请求存到
	// 本地盘（见该处注释），避免各云 S3 兼容实现差异导致 compactor 启动失败。
	// loki_object_store_test.go 断言的也是 filesystem —— 两处必须一致。
	for _, required := range []string{"retention_period: 2160h", "retention_enabled: true", "delete_request_store: filesystem", "bucketnames: logs", "store: tsdb", "schema: v13"} {
		if !strings.Contains(config, required) {
			t.Fatalf("required setting %q missing", required)
		}
	}
	for _, defaultSetting := range []string{"http_listen_port:", "grpc_listen_port:", "chunk_idle_period:", "compaction_interval:", "retention_delete_delay:", "max_entries_limit_per_query:", "frontend_worker:", "chunk_store_config:", "autoforget_unhealthy:"} {
		if strings.Contains(config, defaultSetting) {
			t.Fatalf("unnecessary setting %q remained", defaultSetting)
		}
	}
	d.deployment.Replicas = 2
	if !strings.Contains(d.generateLokiConfig(), "autoforget_unhealthy: true") {
		t.Fatal("multi-replica ring recovery setting missing")
	}
}

func TestK8sManifestKeepsStorageCredentialsInSecret(t *testing.T) {
	d := NewLokiDeployer(&models.LokiDeployment{Mode: "k8s-yaml", RetentionDays: 60, Replicas: 1, StorageConfig: &models.StorageConfig{
		StorageType: "minio", Bucket: "loki", Endpoint: "http://minio:9000",
		AccessKey: "test-access", SecretKey: "test-secret", Insecure: true,
	}}, nil)
	manifest := d.generateManifest("log")
	decoder := yaml.NewDecoder(strings.NewReader(manifest))
	var configYAML string
	var secret map[string]interface{}
	for {
		var doc map[string]interface{}
		if err := decoder.Decode(&doc); err != nil {
			if err == io.EOF {
				break
			}
			t.Fatalf("invalid manifest YAML: %v", err)
		}
		switch doc["kind"] {
		case "ConfigMap":
			configYAML = doc["data"].(map[string]interface{})["loki.yaml"].(string)
		case "Secret":
			secret = doc["data"].(map[string]interface{})
		}
	}
	if configYAML == "" || secret == nil {
		t.Fatal("ConfigMap or Secret missing")
	}
	if strings.Contains(configYAML, "test-access") || strings.Contains(configYAML, "test-secret") {
		t.Fatal("storage credential leaked into ConfigMap")
	}
	for _, marker := range []string{"${LOKI_STORAGE_ACCESS_KEY}", "${LOKI_STORAGE_SECRET_KEY}", "retention_period: 1440h", "retention_enabled: true"} {
		if !strings.Contains(configYAML, marker) {
			t.Fatalf("required Loki setting %q missing", marker)
		}
	}
	if !strings.Contains(manifest, "-config.expand-env=true") || !strings.Contains(manifest, "secretKeyRef:") {
		t.Fatal("StatefulSet does not reference storage Secret")
	}
	for key, want := range map[string]string{"accessKey": "test-access", "secretKey": "test-secret"} {
		decoded, err := base64.StdEncoding.DecodeString(secret[key].(string))
		if err != nil || string(decoded) != want {
			t.Fatalf("Secret %s data mismatch", key)
		}
	}
}

func TestK8sManifestChangesPodTemplateWhenRetentionChanges(t *testing.T) {
	deployment := &models.LokiDeployment{RetentionDays: 30, Replicas: 1}
	d := NewLokiDeployer(deployment, nil)
	checksum := regexp.MustCompile(`checksum/loki-config: "[a-f0-9]{64}"`)
	first := checksum.FindString(d.generateManifest("log"))
	deployment.RetentionDays = 70
	second := checksum.FindString(d.generateManifest("log"))
	if first == "" || second == "" || first == second {
		t.Fatalf("Pod config checksum must change with retention: %q -> %q", first, second)
	}
}