package app

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

var questionCombinationFillSchema = []byte(`{
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "region": {
      "type": "array",
      "maxItems": 4,
      "items": { "type": "string", "minLength": 1, "maxLength": 16 }
    },
    "prefix": {
      "type": "array",
      "maxItems": 4,
      "items": { "type": "string", "minLength": 1, "maxLength": 16 }
    },
    "core": {
      "type": "array",
      "maxItems": 4,
      "items": { "type": "string", "minLength": 1, "maxLength": 18 }
    },
    "industry": {
      "type": "array",
      "maxItems": 4,
      "items": { "type": "string", "minLength": 1, "maxLength": 18 }
    },
    "suffix": {
      "type": "array",
      "maxItems": 4,
      "items": { "type": "string", "minLength": 1, "maxLength": 16 }
    }
  },
  "required": ["region", "prefix", "core", "industry", "suffix"]
}`)

func buildQuestionCombinationFillPrompt(brandCtx *questionBrandContext, regionTerms []string, req QuestionCombinationFillRequest) string {
	competitors := "无"
	if len(brandCtx.CompetitorNames) > 0 {
		encoded, _ := json.Marshal(brandCtx.CompetitorNames)
		competitors = string(encoded)
	}
	hints, _ := json.Marshal(req)
	return fmt.Sprintf(`你是中国 GEO 搜索问题拓展策略师。请为“拓词工具”的 5 个词列生成高频、核心、可组合的问题词组。

【品牌信息】
- 品牌: %s
- 官网: %s
- 描述: %s
- 竞品: %s

【地域优先词】
%s

【当前输入，仅作为语义参考，可改写】
%s

【输出要求】
1. region 使用地域优先词，不要编造不存在的城市；没有有效地域时可输出全国、本地、华东等泛地域词。
2. prefix/core/industry/suffix 各输出 3 到 4 个词，必须短、热、可直接拼成搜索问题。
3. core 要贴近品牌最核心的搜索需求；industry 要贴近行业/品类；suffix 偏“哪家好、怎么选、推荐、多少钱”等高转化问法。
4. 不要输出完整问题，不要带标点，不要解释，严格按 JSON Schema 输出。`,
		strings.TrimSpace(brandCtx.BrandName),
		strings.TrimSpace(nilToString(brandCtx.Website)),
		strings.TrimSpace(nilToString(brandCtx.Description)),
		competitors,
		strings.Join(regionTerms, "、"),
		string(hints),
	)
}