package httpapi

import (
	"net/http"
	"strings"
)

type desktopBillingConfigResponse struct {
	GatewayBaseURL     string `json:"gatewayBaseUrl,omitempty"`
	GatewayBillingPath string `json:"gatewayBillingPath"`
}

type desktopConfigResponse struct {
	Billing desktopBillingConfigResponse `json:"billing"`
}

// getDesktopConfig godoc
// @Summary 获取桌面端配置
// @Description 返回桌面端需要的 Gateway Web 账单入口配置。
// @Tags workspace
// @Produce json
// @Security BearerAuth
// @Success 200 {object} desktopConfigResponse
// @Failure 401 {object} ErrorEnvelope
// @Router /api/workspace/desktop-config [get]
func (s *Server) getDesktopConfig(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, desktopConfigResponse{
		Billing: desktopBillingConfigResponse{
			GatewayBaseURL: firstNonEmpty(
				strings.TrimRight(strings.TrimSpace(s.cfg.WebBaseURL), "/"),
				strings.TrimRight(strings.TrimSpace(s.cfg.PublicBaseURL), "/"),
				requestOrigin(r),
			),
			GatewayBillingPath: "/workspace/billing",
		},
	})
}

func requestOrigin(r *http.Request) string {
	host := strings.TrimSpace(r.Host)
	if host == "" {
		return ""
	}
	proto := strings.TrimSpace(r.Header.Get("X-Forwarded-Proto"))
	if proto == "" {
		proto = "http"
	}
	if comma := strings.Index(proto, ","); comma >= 0 {
		proto = strings.TrimSpace(proto[:comma])
	}
	if proto == "" {
		proto = "http"
	}
	return proto + "://" + host
}