// Package settings 实现分层设置（4.9）：system 默认 → user → project → conversation，
// schema 驱动设置页（生效时机 hot / new-run / restart 显式标注）。
package settings

import (
	core "agent-system-core"
	"agent-system-backend/internal/store"
)

// Scope 层级键：user 与 project:<id> 落库；conversation 经会话画像选择实现。
const (
	ScopeUser = "user"
	ScopeProjectPrefix = "project:"
)

// SystemDefaults 是系统级默认（代码内置，settings.system.json 语义）。
func SystemDefaults() map[string]any {
	return map[string]any{
		"models": map[string]any{
			"chat": map[string]any{
				"baseUrl": "", // 例：https://api.openai.com/v1 （OpenAI 兼容）
				"apiKey":  "",
				"model":   "",
			},
			"lightweight": map[string]any{"baseUrl": "", "apiKey": "", "model": ""},
			"embedding":   map[string]any{"baseUrl": "", "apiKey": "", "model": ""},
			"rerank":      map[string]any{"baseUrl": "", "apiKey": "", "model": ""},
		},
		"runtime": map[string]any{
			"mock":  false, // true = 全部会话走 mock runner（演示/测试）
			"squad": true,  // 小队编排（Agent-Squad 引擎）可用
			"rateLimitPerMin": 0,  // 租户限流（次/分；0 = 不限）
			"redisAddr":       "", // 限流共享后端（原生 Redis addr；空 = 进程内）
		},
		"storage": map[string]any{
			"dataDir": "./data", // 启动注入实际值（--data）
		},
		"context": map[string]any{
			"maxHistoryMessages": 40,
			"maxToolResultChars": 20000,
		},
		"retrieval": map[string]any{"topK": 5},
		"ui": map[string]any{"theme": "dark"},
		"plugins": map[string]any{"dir": "./plugins"},
	}
}

// Schema 返回设置描述清单（设置页渲染依据；插件设置项由 pluginhost 追加）。
func Schema() []core.SettingDesc {
	return []core.SettingDesc{
		{Key: "models.chat.baseUrl", Group: "models", Label: "主模型 Base URL", Type: core.SettingString, Default: "", Effect: core.EffectHot, Description: "OpenAI 兼容端点，如 https://api.openai.com/v1"},
		{Key: "models.chat.apiKey", Group: "models", Label: "主模型 API Key", Type: core.SettingSecret, Default: "", Effect: core.EffectHot},
		{Key: "models.chat.model", Group: "models", Label: "主模型名称", Type: core.SettingString, Default: "", Effect: core.EffectNewRun},
		{Key: "models.lightweight.baseUrl", Group: "models", Label: "轻量模型 Base URL", Type: core.SettingString, Default: "", Effect: core.EffectHot, Description: "标题生成/澄清等轻任务；空则回落主模型"},
		{Key: "models.lightweight.apiKey", Group: "models", Label: "轻量模型 API Key", Type: core.SettingSecret, Default: "", Effect: core.EffectHot},
		{Key: "models.lightweight.model", Group: "models", Label: "轻量模型名称", Type: core.SettingString, Default: "", Effect: core.EffectNewRun},
		{Key: "models.embedding.baseUrl", Group: "models", Label: "Embedding Base URL", Type: core.SettingString, Default: "", Effect: core.EffectHot, Description: "RAG/记忆检索用（向量管线远期启用）"},
		{Key: "models.embedding.apiKey", Group: "models", Label: "Embedding API Key", Type: core.SettingSecret, Default: "", Effect: core.EffectHot},
		{Key: "models.embedding.model", Group: "models", Label: "Embedding 模型", Type: core.SettingString, Default: "", Effect: core.EffectHot},
		{Key: "models.rerank.baseUrl", Group: "models", Label: "Reranker Base URL", Type: core.SettingString, Default: "", Effect: core.EffectHot},
		{Key: "models.rerank.apiKey", Group: "models", Label: "Reranker API Key", Type: core.SettingSecret, Default: "", Effect: core.EffectHot},
		{Key: "models.rerank.model", Group: "models", Label: "Reranker 模型", Type: core.SettingString, Default: "", Effect: core.EffectHot},
		{Key: "runtime.mock", Group: "runtime", Label: "演示模式（mock runner）", Type: core.SettingBool, Default: false, Effect: core.EffectNewRun, Description: "不调用真实模型，按脚本回放事件流"},
		{Key: "runtime.squad", Group: "runtime", Label: "小队编排（Agent-Squad）", Type: core.SettingBool, Default: true, Effect: core.EffectNewRun, Description: "启用 Agent-Squad 引擎编排（#squad 指令与 squad_orchestrate 工具）"},
		{Key: "runtime.rateLimitPerMin", Group: "runtime", Label: "租户限流（次/分）", Type: core.SettingNumber, Default: 0, Effect: core.EffectHot, Description: "0 = 不限；多用户建议 300–1200"},
		{Key: "runtime.redisAddr", Group: "runtime", Label: "Redis 地址（限流共享）", Type: core.SettingString, Default: "", Effect: core.EffectRestart, Description: "原生 Redis（如 127.0.0.1:6379）；空 = 进程内限流（单实例）"},
		{Key: "context.maxHistoryMessages", Group: "context", Label: "历史窗口条数", Type: core.SettingNumber, Default: 40, Effect: core.EffectNewRun},
		{Key: "context.maxToolResultChars", Group: "context", Label: "工具结果上限（字符）", Type: core.SettingNumber, Default: 20000, Effect: core.EffectNewRun},
		{Key: "retrieval.topK", Group: "retrieval", Label: "检索命中数", Type: core.SettingNumber, Default: 5, Effect: core.EffectHot},
		{Key: "ui.theme", Group: "ui", Label: "主题", Type: core.SettingEnum, Default: "dark", Options: []string{"dark", "light"}, Effect: core.EffectHot},
		{Key: "plugins.dir", Group: "plugins", Label: "插件目录", Type: core.SettingString, Default: "./plugins", Effect: core.EffectRestart},
	}
}

// Service 提供有效设置计算与分层写入。
type Service struct {
	st     *store.Store
	system map[string]any // 启动注入的系统层覆盖（如数据目录），位于 defaults 与 user 之间
}

func NewService(st *store.Store) *Service { return &Service{st: st} }

// SetSystemOverride 注入启动期系统层覆盖（组合根调用；不落库）。
func (s *Service) SetSystemOverride(values map[string]any) { s.system = values }

// Effective 计算覆盖链结果：defaults → system(启动注入) → user(租户) → project。
// owner 是租户身份（认证中间件注入；未启用认证 = store.OwnerDefault）。
func (s *Service) Effective(owner, projectID string) core.EffectiveSettings {
	eff := core.MergeSettings(SystemDefaults(), map[string]any{})
	if s.system != nil {
		eff = core.MergeSettings(eff, s.system)
	}
	if user, err := s.st.GetSettingsScope(owner, ScopeUser); err == nil {
		eff = core.MergeSettings(eff, user)
	}
	if projectID != "" {
		if proj, err := s.st.GetSettingsScope(owner, ScopeProjectPrefix+projectID); err == nil {
			eff = core.MergeSettings(eff, proj)
		}
	}
	return eff
}

func (s *Service) UserScope(owner string) (map[string]any, error) {
	return s.st.GetSettingsScope(owner, ScopeUser)
}

func (s *Service) ProjectScope(owner, projectID string) (map[string]any, error) {
	return s.st.GetSettingsScope(owner, ScopeProjectPrefix+projectID)
}

func (s *Service) MergeUser(owner string, values map[string]any) error {
	return s.st.MergeSettingsScope(owner, ScopeUser, values)
}

func (s *Service) MergeProject(owner, projectID string, values map[string]any) error {
	return s.st.MergeSettingsScope(owner, ScopeProjectPrefix+projectID, values)
}

// Masked 返回脱敏视图（secret 类 key 掩码），用于 API 响应。Effective 每次
// 深合并产出新 map，就地掩码不影响后续计算。
func Masked(eff core.EffectiveSettings) map[string]any {
	out := map[string]any(eff)
	maskSecrets(out)
	return out
}

func maskSecrets(m map[string]any) {
	for k, v := range m {
		if vm, ok := v.(map[string]any); ok {
			maskSecrets(vm)
			continue
		}
		if isSecretKey(k) {
			if s, ok := v.(string); ok && s != "" {
				m[k] = "••••••"
			}
		}
	}
}

func isSecretKey(k string) bool {
	return k == "apiKey" || k == "api_key" || k == "secret" || k == "token"
}