package app

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

var questionDistillSchema = []byte(`{
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "candidates": {
      "type": "array",
      "maxItems": 20,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "text": {
            "type": "string",
            "minLength": 4,
            "maxLength": 80
          },
          "intent": {
            "type": "string",
            "enum": ["informational", "evaluative", "decisional"]
          },
          "layer": {
            "type": "string",
            "enum": ["L1", "L2", "L3", "L4", "L5"]
          }
        },
        "required": ["text", "intent", "layer"]
      }
    }
  },
  "required": ["candidates"]
}`)

const questionDistillPromptVersion = "question_distill_v1"

func buildQuestionDistillPrompt(brandName string, competitorNames []string, seedTopic string) string {
	competitors := "无"
	if len(competitorNames) > 0 {
		encoded, _ := json.Marshal(competitorNames)
		competitors = string(encoded)
	}
	return fmt.Sprintf(`你是一个 GEO（Generative Engine Optimization）资深策略师。
请围绕当前品牌和输入主题，生成中国用户在 AI 搜索里真实会问的问题。

【输入】
- 当前品牌: %s
- 竞品列表: %s
- 主题: %s

【约束】
1. candidates 长度不超过 20。
2. 问题必须是自然口语问句，避免口号、短词和营销文案。
3. 尽量覆盖 informational、evaluative、decisional 三类意图。
4. 至少 4 条包含地域、价位、人群或场景修饰。
5. 每条问题尽量不超过 40 个中文字符。
6. 严格按响应格式输出，不要解释。`,
		strings.TrimSpace(brandName),
		competitors,
		strings.TrimSpace(seedTopic),
	)
}