package middleware

import (
	"app-cloudep-portal-api-gateway/internal/domain"
	"app-cloudep-portal-api-gateway/internal/types"
	"context"
	"net/http"

	ers "code.30cm.net/digimon/library-go/errors"
	token "code.30cm.net/digimon/library-go/jwt"
	permissionRpc "code.30cm.net/digimon/proto-all/pkg/permission"
	"github.com/zeromicro/go-zero/rest/httpx"
)

type AuthMiddlewareParam struct {
	TokenSec    string
	TokenClient permissionRpc.TokenServiceClient
}

type AuthMiddleware struct {
	tokenSec    string
	tokenClient permissionRpc.TokenServiceClient
}

func NewAuthMiddleware(param AuthMiddlewareParam) *AuthMiddleware {
	return &AuthMiddleware{
		tokenSec:    param.TokenSec,
		tokenClient: param.TokenClient,
	}
}

// Handle 處理 Auth Middleware
func (m *AuthMiddleware) Handle(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// 解析 Header
		header := types.GetMemberHeader{}
		if err := httpx.ParseHeaders(r, &header); err != nil {
			m.writeErrorResponse(w, r, http.StatusBadRequest, "Failed to parse headers", int64(ers.InvalidFormat().FullCode()))
			return
		}

		// 驗證 Token
		claim, err := token.ParseClaims(header.Token, m.tokenSec, true)
		if err != nil {
			// 是否需要紀錄錯誤，是不是只要紀錄除了驗證失敗或過期之外的真錯誤
			m.writeErrorResponse(w, r, http.StatusForbidden, err.Error(), int64(ers.Forbidden().FullCode()))
			return
		}

		// 驗證 Token 是否在黑名單中
		if _, err := m.tokenClient.ValidationToken(r.Context(), &permissionRpc.ValidationTokenReq{Token: header.Token}); err != nil {
			m.writeErrorResponse(w, r, http.StatusForbidden, err.Error(), int64(ers.Forbidden().FullCode()))
			return
		}

		// 設置 context 並傳遞給下一個處理器
		ctx := SetContext(r, claim)
		next(w, r.WithContext(ctx))
	}
}

func SetContext(r *http.Request, claim token.DataClaims) context.Context {
	ctx := context.WithValue(r.Context(), domain.RoleCode, claim.Role())
	ctx = context.WithValue(ctx, domain.UidCode, claim.UID())
	ctx = context.WithValue(ctx, domain.DeviceIDCode, claim.DeviceID())
	ctx = context.WithValue(ctx, domain.ScopeCode, claim.Get(domain.ScopeCode.ToString()))

	return ctx
}

// writeErrorResponse 用於處理錯誤回應
func (m *AuthMiddleware) writeErrorResponse(w http.ResponseWriter, r *http.Request, statusCode int, message string, code int64) {
	httpx.WriteJsonCtx(r.Context(), w, statusCode, types.BaseResponse{
		Status: types.Status{
			Code:    code,
			Message: message,
		},
	})
}