package middleware

import (
	"encoding/json"
	"time"

	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/net/ghttp"

	"easygoadmin/internal/consts"
	"easygoadmin/utility/cache"
	"easygoadmin/utility/response"
)

// ============================== 租户校验中间件 ==============================

// Tenant 租户状态校验
//
// 位于身份认证中间件之后，处理规则如下：
//   - 超管（上下文租户ID=0）直接放行
//   - 租户级校验状态与过期时间，摘要缓存 60 秒
func Tenant(r *ghttp.Request) {
	if IsPublicPath(r.URL.Path) {
		r.Middleware.Next()
		return
	}
	tenantID := consts.CtxTenantID(r.Context())
	if tenantID == 0 {
		r.Middleware.Next()
		return
	}

	info := loadTenantInfo(r, tenantID)
	if info != nil {
		if info.Status != 1 {
			response.WriteWithCode(r, response.Fail(gerror.NewCode(consts.CodeTenantDisabled)), 1)
			return
		}
		if info.ExpireTime != nil && info.ExpireTime.Time.Before(time.Now()) {
			response.WriteWithCode(r, response.Fail(gerror.NewCode(consts.CodeTenantExpired)), 1)
			return
		}
	}
	r.Middleware.Next()
}

// loadTenantInfo 加载租户摘要
//
// 优先读取缓存（60 秒），未命中时回源 TenantLoader 并写缓存
func loadTenantInfo(r *ghttp.Request, tenantID int) *TenantInfo {
	ck := consts.CacheKeyTenantInfo(tenantID)
	if v, ok := cache.Get(r.Context(), ck); ok {
		info := &TenantInfo{}
		if err := json.Unmarshal([]byte(v), info); err == nil {
			return info
		}
	}
	if TenantLoader == nil {
		return nil
	}
	info, err := TenantLoader(r.Context(), tenantID)
	if err != nil || info == nil {
		glogWarn(r.Context(), "加载租户信息失败 tenantID=%d err=%v", tenantID, err)
		return nil
	}
	if b, err := json.Marshal(info); err == nil {
		_ = cache.Set(r.Context(), ck, string(b), 60)
	}
	return info
}