package middleware

import (
	"fmt"
	"github.com/astaxie/beego"
	"github.com/astaxie/beego/context"
	"github.com/astaxie/beego/logs"
	"github.com/astaxie/beego/session"
	"github.com/beego/beego/v2/client/httplib"
	"net/http"
	"server/config"
	"server/models"
	"strings"
)

// 白名单，不需要登录即可访问
var whitelist = map[string]bool{
	"/user/login":      true,
	"/user/register":   true,
	"/oauth2":          true,
	"/oauth2/callback": true,
}

var UnauthorizedResp = `{"code": 401, "msg":"未登录或者登录已过期！"}`

func init() {
	beego.BConfig.WebConfig.Session.SessionAutoSetCookie = true
}

func checkThirdSession(ctx *context.Context, sess session.Store) {
	cfg := config.Config
	if !cfg.ThirdSession {
		return
	}
	cookie, err := ctx.Request.Cookie(cfg.ThirdSessionName)
	if err != nil {
		logs.Warn("no cookie", err)
		return
	}
	req := httplib.Get(cfg.ThirdSessionCheckUrl)
	req.SetEnableCookie(true)
	req.SetCookie(cookie)
	user := models.User{}
	err = req.ToJSON(&user)
	if err != nil {
		logs.Warn("check third session fail ", err)
		return
	}
	err = sess.Set("user", user)
	if err != nil {
		logs.Warn("set session data fail ", err)
		return
	}
	logs.Debug("check third session ok ", user)
}

func AuthFilter(ctx *context.Context) {
	path := ctx.Request.RequestURI
	path = strings.TrimSuffix(path, "/")
	path = strings.TrimPrefix(path, config.Config.BaseApi)
	if whitelist[path] {
		logs.Debug("in whitelist ,skip ", ctx.Request.RequestURI, path)
		return
	}
	logs.Info(fmt.Sprintf("auth: %s,%s", ctx.Request.RequestURI, path))
	sess := ctx.Input.CruSession
	if sess == nil {
		logs.Warn("no session found in request")
		return
	}
	defer sess.SessionRelease(ctx.ResponseWriter)
	data := sess.Get("user")
	if data == nil {
		checkThirdSession(ctx, sess)
	}
	data = sess.Get("user")
	if data == nil {
		WriteForbidden(ctx.ResponseWriter)
		return
	}
	user := data.(models.User)
	if len(user.Account) == 0 {
		WriteForbidden(ctx.ResponseWriter)
		return
	}
	logs.Info(fmt.Sprintf("request uri: %s, uid: %s", ctx.Request.RequestURI, user.Account))
}

func WriteForbidden(w http.ResponseWriter) {
	w.WriteHeader(401)
	w.Header().Set("Content-Type", "application/json")
	_, err := w.Write([]byte(UnauthorizedResp))
	if err != nil {
		logs.Warn("writeForbidden write error", err)
		return
	}
}