package services

import (
	"context"
	"fmt"
	"strings"

	"gopkg.in/yaml.v3"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"time"
)

type LiveLokiConfig struct {
	Location string `json:"location"`
	YAML     string `json:"yaml"`
}

// GetLiveConfig 读取实际运行的 Loki 配置。仅返回 loki.yaml，不返回整个 ConfigMap 元数据。
func (s *DeploymentService) GetLiveConfig(ctx context.Context, id uint) (*LiveLokiConfig, error) {
	d, err := s.Get(id)
	if err != nil {
		return nil, err
	}
	var raw, location string
	switch d.Mode {
	case "k8s-yaml":
		if d.Cluster == nil {
			return nil, fmt.Errorf("部署未关联 Kubernetes 集群")
		}
		client, err := clusterClient(d.Cluster, 30*time.Second)
		if err != nil {
			return nil, err
		}
		ns := d.Namespace
		if ns == "" {
			ns = "log"
		}
		configMap, err := client.CoreV1().ConfigMaps(ns).Get(ctx, "loki-config", metav1.GetOptions{})
		if err != nil {
			return nil, fmt.Errorf("无法读取 %s/loki-config: %w", ns, err)
		}
		raw = configMap.Data["loki.yaml"]
		location = fmt.Sprintf("ConfigMap %s/loki-config → loki.yaml", ns)
	case "host-binary":
		if d.Host == nil {
			return nil, fmt.Errorf("部署未关联主机")
		}
		client, err := NewSSHClientWithAuth(HostSSHAuth(d.Host))
		if err != nil {
			return nil, fmt.Errorf("连接部署主机失败")
		}
		defer client.Close()
		output, _, err := client.Execute(ctx, "cat /etc/loki/loki.yaml")
		if err != nil {
			return nil, fmt.Errorf("无法读取主机上的 /etc/loki/loki.yaml")
		}
		raw = output
		location = "/etc/loki/loki.yaml"
	case "host-docker":
		if d.Host == nil {
			return nil, fmt.Errorf("部署未关联主机")
		}
		client, err := NewSSHClientWithAuth(HostSSHAuth(d.Host))
		if err != nil {
			return nil, fmt.Errorf("连接部署主机失败")
		}
		defer client.Close()
		location = dockerConfigPath(d.ID)
		output, _, err := client.Execute(ctx, "cat "+location)
		if err != nil {
			return nil, fmt.Errorf("无法读取主机上的 Loki 配置")
		}
		raw = output
	default:
		return nil, fmt.Errorf("当前部署模式暂不支持查看运行配置")
	}
	if strings.TrimSpace(raw) == "" {
		return nil, fmt.Errorf("运行配置为空或尚未部署")
	}
	redacted, err := redactLokiYAML(raw)
	if err != nil {
		return nil, fmt.Errorf("运行配置无法安全展示：YAML 格式无效")
	}
	return &LiveLokiConfig{Location: location, YAML: redacted}, nil
}

func redactLokiYAML(source string) (string, error) {
	var document yaml.Node
	if err := yaml.Unmarshal([]byte(source), &document); err != nil {
		return "", err
	}
	redactYAMLNode(&document)
	output, err := yaml.Marshal(&document)
	return string(output), err
}

func redactYAMLNode(node *yaml.Node) {
	if node.Kind == yaml.ScalarNode && strings.HasPrefix(node.Value, "ENC:") {
		node.Value = "********"
		return
	}
	if node.Kind == yaml.MappingNode {
		for i := 0; i+1 < len(node.Content); i += 2 {
			key, value := node.Content[i], node.Content[i+1]
			switch strings.ToLower(key.Value) {
			case "access_key_id", "secret_access_key", "account_key", "password", "token", "client_secret":
				value.Kind = yaml.ScalarNode
				value.Tag = "!!str"
				value.Value = "********"
				value.Content = nil
				continue
			}
			redactYAMLNode(value)
		}
		return
	}
	for _, child := range node.Content {
		redactYAMLNode(child)
	}
}