package settings

import (
	"encoding/json"
	"strings"
	"time"
)

type secretSpec struct {
	path    string
	service string
}

var secretSpecs = []secretSpec{
	{"models.chat.apiKey", "models.chat"},
	{"models.lightweight.apiKey", "models.lightweight"},
	{"models.embedding.apiKey", "models.embedding"},
	{"models.rerank.apiKey", "models.rerank"},
	{"tools.tavily.apiKeys", "tools.tavily"},
}

// SnapshotAndMigrateSecrets 先为每个已存 scope 留快照，再把明文密钥迁入独立表并从表单设置里清掉。
// 该服务已经有密钥行时不再迁入，避免重复。掩码占位符不迁。
func (s *Service) SnapshotAndMigrateSecrets() error {
	refs, err := s.st.ListSettingsScopes()
	if err != nil {
		return err
	}
	for _, ref := range refs {
		cur, err := s.st.GetSettingsScope(ref.Owner, ref.Scope)
		if err != nil {
			return err
		}
		raw, err := json.Marshal(cur)
		if err != nil {
			return err
		}
		if _, err := s.st.SaveSnapshotIfChanged(ref.Owner, ref.Scope, string(raw), "startup"); err != nil {
			return err
		}
		for _, spec := range secretSpecs {
			val, ok := lookupString(cur, spec.path)
			if !ok || val == MaskPlaceholder {
				continue
			}
			has, err := s.st.HasSecret(ref.Owner, spec.service)
			if err != nil {
				return err
			}
			if !has {
				if _, err := s.st.AddSecret(ref.Owner, spec.service, "迁入", val); err != nil {
					return err
				}
			}
			path := spec.path
			if err := s.st.UpdateSettingsScope(ref.Owner, ref.Scope, func(cur map[string]any) (map[string]any, error) {
				deletePath(cur, path)
				return cur, nil
			}); err != nil {
				return err
			}
		}
	}
	return nil
}

func (s *Service) snapshotThrottled(owner, scope string) {
	if at, ok := s.st.LatestSnapshotAt(owner, scope); ok && time.Since(at) < 10*time.Minute {
		return
	}
	cur, err := s.st.GetSettingsScope(owner, scope)
	if err != nil {
		return
	}
	raw, err := json.Marshal(cur)
	if err != nil {
		return
	}
	_, _ = s.st.SaveSnapshotIfChanged(owner, scope, string(raw), "save")
}

func lookupString(m map[string]any, path string) (string, bool) {
	var cur any = m
	for _, p := range strings.Split(path, ".") {
		obj, ok := cur.(map[string]any)
		if !ok {
			return "", false
		}
		cur, ok = obj[p]
		if !ok {
			return "", false
		}
	}
	s, ok := cur.(string)
	if !ok || strings.TrimSpace(s) == "" {
		return "", false
	}
	return s, true
}

func deletePath(m map[string]any, path string) {
	parts := strings.Split(path, ".")
	cur := m
	for i, p := range parts {
		if i == len(parts)-1 {
			delete(cur, p)
			return
		}
		next, ok := cur[p].(map[string]any)
		if !ok {
			return
		}
		cur = next
	}
}