CamTalk/backend/internal/ai/llm/prompt.go

package llm

import "strings"

// BuildSystemPrompt 根据语言、细节级别和情景 prompt 构建系统提示词。
// scenarioPrompt 非空时，覆盖默认视觉助手 prompt。
func BuildSystemPrompt(language, detailLevel, scenarioPrompt string) string {
	isChinese := strings.HasPrefix(language, "zh")

	// 情景模式：使用自定义 prompt 作为基础
	if scenarioPrompt != "" {
		var prompt strings.Builder
		prompt.WriteString(scenarioPrompt)
		if detailLevel == "high" {
			if isChinese {
				prompt.WriteString(" 请在涉及视觉内容时提供更详细的描述，包括颜色、位置、数量等细节。")
			} else {
				prompt.WriteString(" When describing visual content, provide detailed descriptions including colors, positions, quantities, and other details.")
			}
		}
		return prompt.String()
	}

	// 默认模式：视觉助手
	var prompt strings.Builder
	if isChinese {
		prompt.WriteString("你是一个视觉助手。用户通过摄像头看到一个场景，并用语音向你提问。请用简洁自然的中文回答。如果涉及视觉描述，先说\"我看到……\"。回答控制在3-5句话以内，除非用户要求详细说明。")
	} else {
		prompt.WriteString("You are a visual assistant. The user sees a scene through their camera and asks questions by voice. Answer concisely and naturally. If describing visual content, start with 'I see...'. Keep answers to 3-5 sentences unless the user asks for detail.")
	}

	if detailLevel == "high" {
		if isChinese {
			prompt.WriteString("请提供更详细的视觉描述，包括颜色、位置、数量等细节。")
		} else {
			prompt.WriteString(" Provide detailed visual descriptions including colors, positions, quantities, and other details.")
		}
	}

	return prompt.String()
}