package handler

import (
	"net/http"

	"gen2d/internal/model"
	"gen2d/internal/service"

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

var storageSvc *service.StorageService

// InitStorageService 由 main 在启动时调用，注入七牛云存储服务。
func InitStorageService(svc *service.StorageService) {
	storageSvc = svc
}

// DownloadAsset 素材下载接口，重定向到七牛云 CDN URL。
// GET /api/v1/assets/download?key=...
func DownloadAsset(c *gin.Context) {
	key := c.Query("key")
	if key == "" {
		c.JSON(http.StatusBadRequest, model.Fail(http.StatusBadRequest, "缺少 key 参数"))
		return
	}

	downloadURL, err := storageSvc.GetDownloadURL(c.Request.Context(), key)
	if err != nil {
		c.JSON(http.StatusInternalServerError, model.Fail(http.StatusInternalServerError, "生成下载链接失败"))
		return
	}

	c.Redirect(http.StatusFound, downloadURL)
}