package runtime

import (
	core "agent-system-core"
)

// 模型路由解析（4.7 / 4.9 覆盖链）：设置层 defaults → system → user → project，
// 画像 ModelRoute 为会话内最高层覆盖（kind 为空回落设置层主模型）。
// 端点与密钥按 kind 独立配置，轻量档空则回落主档。

// ResolvedModel 是一次路由解析的结果。
type ResolvedModel struct {
	Kind  string // chat | lightweight
	Model string
	Base  string
	Key   string
}

// ResolveChatModel 解析主对话模型（画像 route > 设置层）。
func ResolveChatModel(prof core.AgentProfile, eff core.EffectiveSettings) ResolvedModel {
	m := eff.GetString("models.chat.model", "")
	if prof.Model.Chat != "" {
		m = prof.Model.Chat
	}
	return ResolvedModel{Kind: "chat", Model: m,
		Base: eff.GetString("models.chat.baseUrl", ""),
		Key:  eff.GetString("models.chat.apiKey", "")}
}

// ResolveLightweightModel 解析轻量模型：画像 route > 设置层轻量档 > 回落主档。
func ResolveLightweightModel(prof core.AgentProfile, eff core.EffectiveSettings) ResolvedModel {
	m := eff.GetString("models.lightweight.model", "")
	base := eff.GetString("models.lightweight.baseUrl", "")
	key := eff.GetString("models.lightweight.apiKey", "")
	if prof.Model.Lightweight != "" {
		m = prof.Model.Lightweight
	}
	if m == "" || base == "" {
		// 回落主档（模型与端点分别回落，允许轻量仅覆盖模型名）。
		chat := ResolveChatModel(prof, eff)
		if m == "" {
			m = chat.Model
		}
		if base == "" {
			base, key = chat.Base, chat.Key
		}
	}
	return ResolvedModel{Kind: "lightweight", Model: m, Base: base, Key: key}
}