package configser

import (
	"fmt"
	"sync"
	"time"
	"videoweb/app/service/upstream"
	"videoweb/pub/common/log"

	"github.com/gin-gonic/gin"
)

const (
	configInfoPath     = "/api/app/config/info"
	configInfoCacheTTL = 60 * time.Second
)

var (
	configMu    sync.Mutex
	configCache *AppConfigVM
	configAt    time.Time
)

// FetchConfigInfo 拉取 APP 公共配置。
func FetchConfigInfo(c *gin.Context) (*ConfigInfoResp, error) {
	var env APIEnvelope[ConfigInfoResp]
	if err := upstream.GetPublicJSON(c, configInfoPath, &env); err != nil {
		return nil, err
	}
	if env.Code != 200 {
		return nil, fmt.Errorf("config info code=%d msg=%s", env.Code, env.Msg)
	}
	return &env.Data, nil
}

// FetchAppConfigVMOrEmpty 带短缓存，失败时返回空配置。
func FetchAppConfigVMOrEmpty(c *gin.Context) AppConfigVM {
	configMu.Lock()
	defer configMu.Unlock()
	if configCache != nil && time.Since(configAt) < configInfoCacheTTL {
		return *configCache
	}

	info, err := FetchConfigInfo(c)
	if err != nil {
		log.Error("fetch app config info failed", log.E(err))
		return AppConfigVM{}
	}
	vm := BuildAppConfigVM(info)
	configCache = &vm
	configAt = time.Now()
	return vm
}