package service

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"prompts-core/model/dto"
	"prompts-core/model/entity"
	"strings"

	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/util/gconv"
)

// 获取请求模型的提示词
func GetModelPrompt(ctx context.Context, Type int) string {
	return g.Cfg().MustGet(ctx, "modelPrompts.types."+gconv.String(Type), "").String()
}

// 获取构建提示词
func GetBuildPrompt(ctx context.Context, Type int) string {
	return g.Cfg().MustGet(ctx, "buildProject.types."+gconv.String(Type), "").String()
}

// buildInferenceRequest 构建返回请求
func buildInferenceRequest(ctx context.Context, req *dto.ComposeMessagesReq, chatModel *entity.AsynchModel, model *entity.AsynchModel, history []map[string]any) (map[string]any, error) {
	messages := []map[string]any{}
	switch req.BuildType {
	//构建提示词请求
	case 1:
		//1. 构建系统提示词
		messages = append(messages, map[string]any{
			"role":    "system",
			"content": promptBuild(ctx, req, model),
		})

		// 2. 构建历史会话提示词
		for _, msg := range history {
			role := gconv.String(msg["role"])
			content := gconv.String(msg["content"])
			if role != "user" && role != "assistant" {
				continue
			}
			messages = append(messages, map[string]any{
				"role":    role,
				"content": content,
			})
		}
		// 3. 当前用户问题（原来的最后一条）
		messages = append(messages, map[string]any{
			"role":    "user",
			"content": buildUserPrompt(ctx, req, GetModelPrompt(ctx, model.ModelType)),
		})
	//构建节点请求
	case 2:
		messages = append(messages, map[string]any{
			"role":    "user",
			"content": NodeBuid(ctx, req),
		})
	default:
		return nil, errors.New("不支持的构建类型")
	}
	// 构建请求体
	return map[string]any{
		"modelName":   chatModel.ModelName,
		"bizName":     "prompts-core",
		"callbackUrl": "/prompt/callback",
		"requestPayload": map[string]any{
			"model":    chatModel.ModelName,
			"messages": messages,
			"stream":   false,
		},
	}, nil
}

// ============================================
// 构建用户提示词
// ============================================
func buildUserPrompt(ctx context.Context, req *dto.ComposeMessagesReq, prompt string) string {
	payload := map[string]any{
		"model": req.ModelName,
		//数据库提示信息
		"promptInfo": prompt,
		// 系统表单
		"form": req.Form,
		// 用户表单
		"userForm": req.UserForm,
		//文件url
		"userFiles": req.UserFiles,
		//解读文件（只支持可读类型 如：xml，json,yaml）
		"userFilesText": FetchFileTexts(ctx, req.UserFiles),
		//skill 相关（根据传入的 skillName 获取 zip 内所有 md 文件拼接内容）
		"skills": SkillMdContent(ctx, req.SkillName),
	}
	return mustMarshal(payload)
}

// promptBuild 提示词构建
func promptBuild(ctx context.Context, req *dto.ComposeMessagesReq, model *entity.AsynchModel) string {
	// 1. 从配置文件读取提示词模板
	promptTpl := GetBuildPrompt(ctx, req.BuildType)
	if promptTpl == "" {
		return ""
	}
	// 2. 构建字段映射说明
	mappingBytes, _ := json.Marshal(model.RequestMapping)
	mappingStr := string(mappingBytes)

	var mapping map[string]string
	_ = json.Unmarshal(mappingBytes, &mapping)

	var fieldDesc strings.Builder
	for key, path := range mapping {
		fieldDesc.WriteString(fmt.Sprintf("- %s → %s\n", key, path))
	}

	// 3. 拼接 UserForm 全文（必须完整阅读）
	var userFormContent strings.Builder
	for k, v := range req.UserForm {
		userFormContent.WriteString(fmt.Sprintf("%s=%v；", k, v))
	}
	userFormFullText := strings.TrimSuffix(userFormContent.String(), "；")

	// 4. 双表单信息
	formInfo := fmt.Sprintf(`
【系统表单（系统提示词/参数）】
%s
【用户表单全文（必须完整阅读，全部作为用户提示词来源）】
%s
`, formToJSON(req.Form), userFormFullText)
	// 5. 格式化最终提示词（替换配置里的 %s）
	return fmt.Sprintf(promptTpl, mappingStr, fieldDesc.String(), formInfo)
}

// NodeBuid 节点构建
func NodeBuid(ctx context.Context, req *dto.ComposeMessagesReq) string {
	promptTpl := GetBuildPrompt(ctx, req.BuildType)
	if promptTpl == "" {
		return ""
	}
	formStr := formToJSON(req.Form)
	userFormStr := formToJSON(req.UserForm)
	return fmt.Sprintf(promptTpl, formStr, userFormStr)
}