package controllers

import (
	"bytes"
	"crypto/tls"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"strings"
	"time"

	"server/models"
	"server/pkg/jwtutil"

	"github.com/beego/beego/v2/client/orm"
	beego "github.com/beego/beego/v2/server/web"
)

// PlatformAgentApiController 智能体API管理（yz_platform_agent_api，平台端）
type PlatformAgentApiController struct {
	beego.Controller
}

// agentApiHTTPClient 用于探测上游接口连通性
var agentApiHTTPClient = &http.Client{
	Timeout: 30 * time.Second,
	Transport: &http.Transport{
		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
	},
}

// 支持的请求协议白名单，与前端 constants.js 的 PROTOCOLS 保持一致
var agentApiProtocols = map[string]bool{
	models.AgentProtocolChatCompletions: true,
	models.AgentProtocolResponses:       true,
	models.AgentProtocolAnthropic:       true,
	models.AgentProtocolGemini:          true,
	models.AgentProtocolCustom:          true,
}

// agentApiEndpointPath 各协议在根地址之后要追加的路径
// custom 与 gemini 不在此表中：custom 不追加任何路径，gemini 需要嵌入模型名
var agentApiEndpointPath = map[string]string{
	models.AgentProtocolChatCompletions: "/chat/completions",
	models.AgentProtocolResponses:       "/responses",
	models.AgentProtocolAnthropic:       "/messages",
}

// normalizeProtocol 缺省或非法值统一回落到 Chat Completions
// 该协议被绝大多数官方接口、国产网关与自建中转支持，作为兜底最安全
func normalizeProtocol(p string) string {
	p = strings.TrimSpace(strings.ToLower(p))
	if p == "" || !agentApiProtocols[p] {
		return models.AgentProtocolChatCompletions
	}
	return p
}

func (c *PlatformAgentApiController) jsonErr(httpStatus, bizCode int, msg string) {
	c.Ctx.Output.SetStatus(httpStatus)
	c.Data["json"] = map[string]interface{}{"code": bizCode, "msg": msg}
	_ = c.ServeJSON()
}

func (c *PlatformAgentApiController) ok(msg string, data interface{}) {
	resp := map[string]interface{}{"code": 200, "msg": msg}
	if data != nil {
		resp["data"] = data
	}
	c.Data["json"] = resp
	_ = c.ServeJSON()
}

func (c *PlatformAgentApiController) platformClaims() (*jwtutil.Claims, error) {
	auth := c.Ctx.Request.Header.Get("Authorization")
	if auth == "" {
		return nil, fmt.Errorf("未登录")
	}
	parts := strings.SplitN(auth, " ", 2)
	if len(parts) != 2 || parts[0] != "Bearer" {
		return nil, fmt.Errorf("认证信息格式错误")
	}
	claims, err := jwtutil.ParseToken(parts[1])
	if err != nil {
		return nil, fmt.Errorf("无效的token")
	}
	if claims.UserType != "platform" {
		return nil, fmt.Errorf("无权访问")
	}
	return claims, nil
}

// agentApiPayload 新增/更新请求体
// ApiKeys 用指针：编辑时不传该字段表示不修改已存密钥列表
type agentApiPayload struct {
	Provider     string                `json:"provider"`
	Protocol     string                `json:"protocol"`
	BaseURL      string                `json:"base_url"`
	UseCustomURL int8                  `json:"use_custom_url"`
	CustomURL    string                `json:"custom_url"`
	ApiKeys      *[]models.AgentApiKey `json:"api_keys"`
	Models       []string              `json:"models"`
	Status       *int8                 `json:"status"`
	Remark       string                `json:"remark"`
}

// apiKeysToJSON 把密钥列表序列化为 JSON 字符串入库
// 去掉空密钥、按 key 去重，备注允许为空
func apiKeysToJSON(list []models.AgentApiKey) string {
	cleaned := make([]models.AgentApiKey, 0, len(list))
	seen := make(map[string]bool, len(list))
	for _, item := range list {
		k := strings.TrimSpace(item.Key)
		if k == "" || seen[k] {
			continue
		}
		seen[k] = true
		cleaned = append(cleaned, models.AgentApiKey{
			Key:    k,
			Remark: strings.TrimSpace(item.Remark),
		})
	}
	b, err := json.Marshal(cleaned)
	if err != nil {
		return "[]"
	}
	return string(b)
}

// apiKeysFromJSON 把库里的 JSON 字符串反序列化为密钥列表
// 兼容三种历史/异常格式：对象数组、纯字符串数组、单个裸密钥字符串
func apiKeysFromJSON(raw string) []models.AgentApiKey {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return []models.AgentApiKey{}
	}

	if strings.HasPrefix(raw, "[") {
		// 标准格式：[{"key":"sk-x","remark":"mimo198"}]
		var objs []models.AgentApiKey
		if err := json.Unmarshal([]byte(raw), &objs); err == nil {
			out := make([]models.AgentApiKey, 0, len(objs))
			for _, o := range objs {
				if strings.TrimSpace(o.Key) != "" {
					out = append(out, o)
				}
			}
			return out
		}
		// 退化格式：["sk-x","sk-y"]
		var strs []string
		if err := json.Unmarshal([]byte(raw), &strs); err == nil {
			out := make([]models.AgentApiKey, 0, len(strs))
			for _, s := range strs {
				if s = strings.TrimSpace(s); s != "" {
					out = append(out, models.AgentApiKey{Key: s})
				}
			}
			return out
		}
		return []models.AgentApiKey{}
	}

	// 迁移遗漏时的兜底：整个字段就是一个裸密钥
	return []models.AgentApiKey{{Key: raw}}
}

// modelsToJSON 把模型数组序列化为 JSON 字符串入库
func modelsToJSON(list []string) string {
	cleaned := make([]string, 0, len(list))
	seen := make(map[string]bool, len(list))
	for _, m := range list {
		m = strings.TrimSpace(m)
		if m == "" || seen[m] {
			continue
		}
		seen[m] = true
		cleaned = append(cleaned, m)
	}
	b, err := json.Marshal(cleaned)
	if err != nil {
		return "[]"
	}
	return string(b)
}

// modelsFromJSON 把库里的 JSON 字符串反序列化为模型数组
// 兼容历史数据可能存的逗号分隔格式
func modelsFromJSON(raw string) []string {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return []string{}
	}
	if strings.HasPrefix(raw, "[") {
		var out []string
		if err := json.Unmarshal([]byte(raw), &out); err == nil {
			return out
		}
		return []string{}
	}
	parts := strings.Split(raw, ",")
	out := make([]string, 0, len(parts))
	for _, p := range parts {
		if p = strings.TrimSpace(p); p != "" {
			out = append(out, p)
		}
	}
	return out
}

// agentApiToMap 统一输出结构
// 密钥以明文返回，前端卡片默认脱敏、可切换显示；接口本身已受平台端鉴权保护
func agentApiToMap(row *models.PlatformAgentApi) map[string]interface{} {
	keys := apiKeysFromJSON(row.ApiKeys)
	protocol := normalizeProtocol(row.Protocol)
	out := map[string]interface{}{
		"id":             row.ID,
		"provider":       row.Provider,
		"protocol":       protocol,
		"api_keys":       keys,
		"key_count":      len(keys),
		"base_url":       row.BaseURL,
		"use_custom_url": row.UseCustomURL,
		"custom_url":     row.CustomURL,
		"models":         modelsFromJSON(row.Models),
		"status":         row.Status,
		"remark":         row.Remark,
		"user_id":        row.UserID,
		"user_name":      row.UserName,
		"create_time":    row.CreateTime.Format("2006-01-02 15:04:05"),
		"update_time":    "",
	}
	if row.UpdateTime != nil {
		out["update_time"] = row.UpdateTime.Format("2006-01-02 15:04:05")
	}
	return out
}

// validateAgentApiPayload 校验必填与地址格式
func validateAgentApiPayload(p *agentApiPayload, isCreate bool) error {
	// 上游接口为用户自由填写的文本，不做枚举校验
	p.Provider = strings.TrimSpace(p.Provider)
	if p.Provider == "" {
		return fmt.Errorf("请输入上游接口名称")
	}
	if len([]rune(p.Provider)) > 100 {
		return fmt.Errorf("上游接口名称过长")
	}

	// 请求协议必须是白名单内的值，缺省回落到 Chat Completions
	p.Protocol = strings.TrimSpace(strings.ToLower(p.Protocol))
	if p.Protocol == "" {
		p.Protocol = models.AgentProtocolChatCompletions
	}
	if !agentApiProtocols[p.Protocol] {
		return fmt.Errorf("请求协议不正确")
	}

	p.BaseURL = strings.TrimSpace(p.BaseURL)
	p.CustomURL = strings.TrimSpace(p.CustomURL)

	if p.UseCustomURL == 1 {
		if p.CustomURL == "" {
			return fmt.Errorf("请输入自定义地址")
		}
		if !isHTTPURL(p.CustomURL) {
			return fmt.Errorf("自定义地址需以 http:// 或 https:// 开头")
		}
	} else {
		p.CustomURL = ""
		if p.BaseURL == "" {
			return fmt.Errorf("请输入接口地址")
		}
		if !isHTTPURL(p.BaseURL) {
			return fmt.Errorf("接口地址需以 http:// 或 https:// 开头")
		}
	}

	if len(p.Models) == 0 {
		return fmt.Errorf("请至少添加一个模型")
	}

	// 新增时必须带密钥；编辑时不传表示沿用已存密钥列表
	if p.ApiKeys != nil {
		valid := 0
		for _, k := range *p.ApiKeys {
			if strings.TrimSpace(k.Key) != "" {
				valid++
			}
			if len([]rune(k.Remark)) > 100 {
				return fmt.Errorf("密钥备注过长，单条限 100 字")
			}
		}
		if valid == 0 {
			return fmt.Errorf("请至少添加一个 API Key")
		}
	} else if isCreate {
		return fmt.Errorf("请至少添加一个 API Key")
	}

	return nil
}

func isHTTPURL(s string) bool {
	low := strings.ToLower(s)
	return strings.HasPrefix(low, "http://") || strings.HasPrefix(low, "https://")
}

// buildAgentEndpoint 依据协议算出实际请求地址
// custom 协议直接把填写的地址当完整端点，不做任何追加；
// 其余协议在根地址后追加各自路径，若地址已以该路径结尾则不重复追加
func buildAgentEndpoint(protocol, base, model, apiKey string) string {
	base = strings.TrimRight(base, "/")

	switch protocol {
	case models.AgentProtocolCustom:
		return base

	case models.AgentProtocolGemini:
		// 模型名嵌在路径中间，无固定后缀可判重
		return fmt.Sprintf("%s/models/%s:generateContent?key=%s", base, model, apiKey)

	default:
		path := agentApiEndpointPath[protocol]
		if path == "" {
			path = "/chat/completions"
		}
		// 用户可能填根地址，也可能直接填完整端点，后者不再追加
		if strings.HasSuffix(strings.ToLower(base), strings.ToLower(path)) {
			return base
		}
		return base + path
	}
}

// List GET /platform/agentApi/list?page=1&pageSize=24&keyword=&provider=&status=
func (c *PlatformAgentApiController) List() {
	if _, err := c.platformClaims(); err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}

	page, _ := c.GetInt("page", 1)
	pageSize, _ := c.GetInt("pageSize", 24)
	if page < 1 {
		page = 1
	}
	if pageSize < 1 {
		pageSize = 24
	}
	if pageSize > 200 {
		pageSize = 200
	}

	keyword := strings.TrimSpace(c.GetString("keyword"))
	provider := strings.TrimSpace(c.GetString("provider"))
	statusStr := strings.TrimSpace(c.GetString("status"))

	qs := models.Orm.QueryTable(new(models.PlatformAgentApi)).Filter("is_deleted", 0)

	cond := orm.NewCondition()
	needCond := false

	// 上游名称为自由文本，用模糊匹配而非精确相等
	if provider != "" {
		cond = cond.And("provider__icontains", provider)
		needCond = true
	}
	if statusStr != "" {
		if st, err := strconv.Atoi(statusStr); err == nil {
			cond = cond.And("status", st)
			needCond = true
		}
	}
	if keyword != "" {
		kw := orm.NewCondition().
			Or("provider__icontains", keyword).
			Or("base_url__icontains", keyword).
			Or("custom_url__icontains", keyword).
			Or("models__icontains", keyword).
			Or("remark__icontains", keyword)
		cond = cond.AndCond(kw)
		needCond = true
	}
	if needCond {
		qs = qs.SetCond(cond)
	}

	total, err := qs.Count()
	if err != nil {
		c.jsonErr(500, 500, "查询失败: "+err.Error())
		return
	}

	var rows []models.PlatformAgentApi
	_, err = qs.OrderBy("-id").Limit(pageSize, (page-1)*pageSize).All(&rows)
	if err != nil && err != orm.ErrNoRows {
		c.jsonErr(500, 500, "查询失败: "+err.Error())
		return
	}

	list := make([]map[string]interface{}, 0, len(rows))
	for i := range rows {
		list = append(list, agentApiToMap(&rows[i]))
	}

	c.ok("success", map[string]interface{}{
		"list":  list,
		"total": total,
	})
}

// Detail GET /platform/agentApi/:id
func (c *PlatformAgentApiController) Detail() {
	if _, err := c.platformClaims(); err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}

	row, err := c.findByID()
	if err != nil {
		return
	}

	c.ok("success", agentApiToMap(row))
}

// findByID 读取路径参数并查询记录，出错时已写入响应
func (c *PlatformAgentApiController) findByID() (*models.PlatformAgentApi, error) {
	id, err := strconv.ParseUint(c.Ctx.Input.Param(":id"), 10, 64)
	if err != nil || id == 0 {
		c.jsonErr(400, 400, "无效ID")
		return nil, fmt.Errorf("无效ID")
	}

	var row models.PlatformAgentApi
	err = models.Orm.QueryTable(new(models.PlatformAgentApi)).
		Filter("id", id).
		Filter("is_deleted", 0).
		One(&row)
	if err != nil {
		if err == orm.ErrNoRows {
			c.jsonErr(404, 404, "配置不存在")
		} else {
			c.jsonErr(500, 500, "查询失败: "+err.Error())
		}
		return nil, err
	}
	return &row, nil
}

// Create POST /platform/agentApi
func (c *PlatformAgentApiController) Create() {
	claims, err := c.platformClaims()
	if err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}

	raw, err := io.ReadAll(c.Ctx.Request.Body)
	if err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}

	var p agentApiPayload
	if err := json.Unmarshal(raw, &p); err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}

	if err := validateAgentApiPayload(&p, true); err != nil {
		c.jsonErr(400, 400, err.Error())
		return
	}

	status := int8(1)
	if p.Status != nil {
		status = *p.Status
	}

	userID := uint64(claims.UserID)
	row := &models.PlatformAgentApi{
		Provider:     p.Provider,
		Protocol:     p.Protocol,
		BaseURL:      p.BaseURL,
		UseCustomURL: p.UseCustomURL,
		CustomURL:    p.CustomURL,
		ApiKeys:      apiKeysToJSON(*p.ApiKeys),
		Models:       modelsToJSON(p.Models),
		Status:       status,
		Remark:       strings.TrimSpace(p.Remark),
		UserID:       &userID,
		UserName:     &claims.Username,
		IsDeleted:    0,
	}

	id, err := models.Orm.Insert(row)
	if err != nil {
		c.jsonErr(500, 500, "创建失败: "+err.Error())
		return
	}
	row.ID = uint64(id)

	c.ok("创建成功", agentApiToMap(row))
}

// Update PUT /platform/agentApi/:id
func (c *PlatformAgentApiController) Update() {
	if _, err := c.platformClaims(); err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}

	row, err := c.findByID()
	if err != nil {
		return
	}

	raw, err := io.ReadAll(c.Ctx.Request.Body)
	if err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}

	var p agentApiPayload
	if err := json.Unmarshal(raw, &p); err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}

	if err := validateAgentApiPayload(&p, false); err != nil {
		c.jsonErr(400, 400, err.Error())
		return
	}

	now := time.Now()
	updates := map[string]interface{}{
		"provider":       p.Provider,
		"protocol":       p.Protocol,
		"base_url":       p.BaseURL,
		"use_custom_url": p.UseCustomURL,
		"custom_url":     p.CustomURL,
		"models":         modelsToJSON(p.Models),
		"remark":         strings.TrimSpace(p.Remark),
		"update_time":    now,
	}
	if p.Status != nil {
		updates["status"] = *p.Status
	}
	// 未上送 api_keys 表示不修改已存密钥列表
	if p.ApiKeys != nil {
		updates["api_keys"] = apiKeysToJSON(*p.ApiKeys)
	}

	_, err = models.Orm.QueryTable(new(models.PlatformAgentApi)).
		Filter("id", row.ID).
		Update(updates)
	if err != nil {
		c.jsonErr(500, 500, "更新失败: "+err.Error())
		return
	}

	c.ok("更新成功", nil)
}

// Delete DELETE /platform/agentApi/:id
func (c *PlatformAgentApiController) Delete() {
	if _, err := c.platformClaims(); err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}

	row, err := c.findByID()
	if err != nil {
		return
	}

	now := time.Now()
	_, err = models.Orm.QueryTable(new(models.PlatformAgentApi)).
		Filter("id", row.ID).
		Update(map[string]interface{}{
			"is_deleted":  1,
			"delete_time": now,
		})
	if err != nil {
		c.jsonErr(500, 500, "删除失败: "+err.Error())
		return
	}

	c.ok("删除成功", nil)
}

// BatchDelete POST /platform/agentApi/batchDelete
func (c *PlatformAgentApiController) BatchDelete() {
	if _, err := c.platformClaims(); err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}

	raw, err := io.ReadAll(c.Ctx.Request.Body)
	if err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}

	var p struct {
		IDs []uint64 `json:"ids"`
	}
	if err := json.Unmarshal(raw, &p); err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}
	if len(p.IDs) == 0 {
		c.jsonErr(400, 400, "请选择要删除的配置")
		return
	}

	now := time.Now()
	_, err = models.Orm.QueryTable(new(models.PlatformAgentApi)).
		Filter("id__in", p.IDs).
		Filter("is_deleted", 0).
		Update(map[string]interface{}{
			"is_deleted":  1,
			"delete_time": now,
		})
	if err != nil {
		c.jsonErr(500, 500, "批量删除失败: "+err.Error())
		return
	}

	c.ok("批量删除成功", nil)
}

// ToggleStatus POST /platform/agentApi/:id/status
func (c *PlatformAgentApiController) ToggleStatus() {
	if _, err := c.platformClaims(); err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}

	row, err := c.findByID()
	if err != nil {
		return
	}

	raw, err := io.ReadAll(c.Ctx.Request.Body)
	if err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}

	var p struct {
		Status *int8 `json:"status"`
	}
	if err := json.Unmarshal(raw, &p); err != nil || p.Status == nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}
	if *p.Status != 0 && *p.Status != 1 {
		c.jsonErr(400, 400, "状态值不正确")
		return
	}

	now := time.Now()
	_, err = models.Orm.QueryTable(new(models.PlatformAgentApi)).
		Filter("id", row.ID).
		Update(map[string]interface{}{
			"status":      *p.Status,
			"update_time": now,
		})
	if err != nil {
		c.jsonErr(500, 500, "状态切换失败: "+err.Error())
		return
	}

	c.ok("操作成功", nil)
}

// agentApiTestResult 测试结果统一结构，与前端 test.vue 字段对应
// Endpoint 回显实际请求的完整地址，便于排查路径拼接类问题（如上游根地址少了版本前缀）
type agentApiTestResult struct {
	Success    bool   `json:"success"`
	Message    string `json:"message"`
	StatusCode int    `json:"status_code,omitempty"`
	LatencyMs  int64  `json:"latency_ms"`
	Model      string `json:"model,omitempty"`
	KeyRemark  string `json:"key_remark,omitempty"`
	Endpoint   string `json:"endpoint,omitempty"`
	Response   string `json:"response,omitempty"`
	Detail     string `json:"detail,omitempty"`
}

// redactKeyInURL 隐去 URL 查询串里的密钥
// Gemini 协议把 key 放在 query 中，回显 endpoint 前必须脱敏
func redactKeyInURL(rawURL, key string) string {
	if key == "" {
		return rawURL
	}
	return strings.ReplaceAll(rawURL, key, "***")
}

// Test POST /platform/agentApi/test
// 请求体：{ "id": 1, "model": "gpt-4o", "key_index": 0, "prompt": "你好" }
// key_index 指定用密钥列表中的第几个密钥，缺省用第一个
func (c *PlatformAgentApiController) Test() {
	if _, err := c.platformClaims(); err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}

	raw, err := io.ReadAll(c.Ctx.Request.Body)
	if err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}

	var p struct {
		ID       uint64 `json:"id"`
		Model    string `json:"model"`
		KeyIndex *int   `json:"key_index"`
		Prompt   string `json:"prompt"`
	}
	if err := json.Unmarshal(raw, &p); err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}
	if p.ID == 0 {
		c.jsonErr(400, 400, "缺少配置ID")
		return
	}

	var row models.PlatformAgentApi
	err = models.Orm.QueryTable(new(models.PlatformAgentApi)).
		Filter("id", p.ID).
		Filter("is_deleted", 0).
		One(&row)
	if err != nil {
		c.jsonErr(404, 404, "配置不存在")
		return
	}

	model := strings.TrimSpace(p.Model)
	if model == "" {
		list := modelsFromJSON(row.Models)
		if len(list) == 0 {
			c.jsonErr(400, 400, "该配置未添加模型")
			return
		}
		model = list[0]
	}

	// 挑选待测密钥
	keys := apiKeysFromJSON(row.ApiKeys)
	if len(keys) == 0 {
		c.jsonErr(400, 400, "该配置未添加 API Key")
		return
	}
	idx := 0
	if p.KeyIndex != nil {
		idx = *p.KeyIndex
	}
	if idx < 0 || idx >= len(keys) {
		c.jsonErr(400, 400, "指定的密钥不存在")
		return
	}
	chosen := keys[idx]

	prompt := strings.TrimSpace(p.Prompt)
	if prompt == "" {
		prompt = "你好"
	}

	result := probeAgentApi(&row, chosen, model, prompt)
	c.ok("success", result)
}

// probeAgentApi 用指定密钥按配置的请求协议发起一次最小化对话请求
func probeAgentApi(
	row *models.PlatformAgentApi,
	apiKey models.AgentApiKey,
	model, prompt string,
) agentApiTestResult {
	base := strings.TrimRight(row.EffectiveURL(), "/")
	if base == "" {
		return agentApiTestResult{
			Success: false, Message: "接口地址为空",
			Model: model, KeyRemark: apiKey.Remark,
		}
	}

	// 协议由配置显式指定，不再根据上游名称猜测
	protocol := normalizeProtocol(row.Protocol)
	endpoint := buildAgentEndpoint(protocol, base, model, apiKey.Key)

	var (
		body    []byte
		headers = map[string]string{"Content-Type": "application/json"}
		err     error
	)

	switch protocol {
	case models.AgentProtocolAnthropic:
		headers["x-api-key"] = apiKey.Key
		headers["anthropic-version"] = "2023-06-01"
		body, err = json.Marshal(map[string]interface{}{
			"model":      model,
			"max_tokens": 64,
			"messages": []map[string]string{
				{"role": "user", "content": prompt},
			},
		})

	case models.AgentProtocolGemini:
		// 密钥已放在 query 中，无需鉴权头
		body, err = json.Marshal(map[string]interface{}{
			"contents": []map[string]interface{}{
				{"parts": []map[string]string{{"text": prompt}}},
			},
		})

	case models.AgentProtocolResponses:
		// Responses API 用 input 字段替代 messages
		headers["Authorization"] = "Bearer " + apiKey.Key
		body, err = json.Marshal(map[string]interface{}{
			"model":             model,
			"input":             prompt,
			"max_output_tokens": 64,
		})

	default:
		// Chat Completions 与 custom 均按 OpenAI 标准报文发送
		headers["Authorization"] = "Bearer " + apiKey.Key
		body, err = json.Marshal(map[string]interface{}{
			"model":      model,
			"max_tokens": 64,
			"messages": []map[string]string{
				{"role": "user", "content": prompt},
			},
		})
	}

	if err != nil {
		return agentApiTestResult{
			Success: false, Message: "构造请求失败", Detail: err.Error(),
			Model: model, KeyRemark: apiKey.Remark,
		}
	}

	req, err := http.NewRequest(http.MethodPost, endpoint, bytes.NewReader(body))
	if err != nil {
		return agentApiTestResult{
			Success: false, Message: "构造请求失败", Detail: err.Error(),
			Model: model, KeyRemark: apiKey.Remark,
			Endpoint: redactKeyInURL(endpoint, apiKey.Key),
		}
	}
	for k, v := range headers {
		req.Header.Set(k, v)
	}

	safeEndpoint := redactKeyInURL(endpoint, apiKey.Key)

	start := time.Now()
	resp, err := agentApiHTTPClient.Do(req)
	latency := time.Since(start).Milliseconds()

	if err != nil {
		return agentApiTestResult{
			Success:   false,
			Message:   "请求上游失败（网络不通或地址错误）",
			Detail:    err.Error(),
			LatencyMs: latency,
			Model:     model,
			KeyRemark: apiKey.Remark,
			Endpoint:  safeEndpoint,
		}
	}
	defer resp.Body.Close()

	// 限制读取长度，避免超长响应占满内存
	respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 8*1024))
	preview := string(respBody)

	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		msg := fmt.Sprintf("上游返回 HTTP %d", resp.StatusCode)
		// 404 多半是接口地址少了版本前缀，给出可操作的提示
		if resp.StatusCode == 404 {
			msg += "：接口地址可能不正确，请检查是否缺少版本路径（如 /v1、/compatible-mode/v2）"
		}
		return agentApiTestResult{
			Success:    false,
			Message:    msg,
			StatusCode: resp.StatusCode,
			LatencyMs:  latency,
			Model:      model,
			KeyRemark:  apiKey.Remark,
			Endpoint:   safeEndpoint,
			Detail:     preview,
		}
	}

	return agentApiTestResult{
		Success:    true,
		Message:    "连接正常，密钥与模型可用",
		StatusCode: resp.StatusCode,
		LatencyMs:  latency,
		Model:      model,
		KeyRemark:  apiKey.Remark,
		Endpoint:   safeEndpoint,
		Response:   extractAgentReply(protocol, respBody, preview),
	}
}

// extractAgentReply 从上游响应里提取模型回复文本，解析失败则回退为原始预览
func extractAgentReply(protocol string, respBody []byte, fallback string) string {
	switch protocol {
	case models.AgentProtocolAnthropic:
		var r struct {
			Content []struct {
				Text string `json:"text"`
			} `json:"content"`
		}
		if json.Unmarshal(respBody, &r) == nil && len(r.Content) > 0 {
			return r.Content[0].Text
		}

	case models.AgentProtocolGemini:
		var r struct {
			Candidates []struct {
				Content struct {
					Parts []struct {
						Text string `json:"text"`
					} `json:"parts"`
				} `json:"content"`
			} `json:"candidates"`
		}
		if json.Unmarshal(respBody, &r) == nil &&
			len(r.Candidates) > 0 && len(r.Candidates[0].Content.Parts) > 0 {
			return r.Candidates[0].Content.Parts[0].Text
		}

	case models.AgentProtocolResponses:
		// Responses API 优先取聚合字段 output_text，回退到 output 数组
		var r struct {
			OutputText string `json:"output_text"`
			Output     []struct {
				Content []struct {
					Text string `json:"text"`
				} `json:"content"`
			} `json:"output"`
		}
		if json.Unmarshal(respBody, &r) == nil {
			if r.OutputText != "" {
				return r.OutputText
			}
			if len(r.Output) > 0 && len(r.Output[0].Content) > 0 {
				return r.Output[0].Content[0].Text
			}
		}

	default:
		var r struct {
			Choices []struct {
				Message struct {
					Content string `json:"content"`
				} `json:"message"`
			} `json:"choices"`
		}
		if json.Unmarshal(respBody, &r) == nil && len(r.Choices) > 0 {
			return r.Choices[0].Message.Content
		}
	}
	return fallback
}