package svc

import (
	"errors"
	"fmt"
	"fusenapi/server/backend/internal/config"
	"fusenapi/shared"
	"net/http"
	"time"

	"fusenapi/initalize"
	"fusenapi/model/gmodel"

	"github.com/golang-jwt/jwt"
	"gorm.io/gorm"
)

type ServiceContext struct {
	Config      config.Config
	SharedState *shared.SharedState

	MysqlConn *gorm.DB
	AllModels *gmodel.AllModelsGen
}

func NewServiceContext(c config.Config) *ServiceContext {
	db := initalize.InitMysql(c.SourceMysql).Set("gorm:slow_query_time", time.Second*15)
	return &ServiceContext{
		Config:    c,
		MysqlConn: initalize.InitMysql(c.SourceMysql),
		AllModels: gmodel.NewAllModels(db),
	}
}

func (svcCtx *ServiceContext) ParseJwtToken(r *http.Request) (jwt.MapClaims, error) {
	AuthKey := r.Header.Get("Authorization")

	if len(AuthKey) <= 50 {
		return nil, errors.New(fmt.Sprint("Error parsing token, len:", len(AuthKey)))
	}

	AuthKey = AuthKey[7:]

	token, err := jwt.Parse(AuthKey, func(token *jwt.Token) (interface{}, error) {
		// 检查签名方法是否为 HS256
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
		}
		// 返回用于验证签名的密钥
		return []byte(svcCtx.Config.Auth.AccessSecret), nil
	})
	if err != nil {
		return nil, errors.New(fmt.Sprint("Error parsing token:", err))
	}

	// 验证成功返回
	if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
		return claims, nil
	}

	return nil, errors.New(fmt.Sprint("Invalid token", err))
}