package middleware

import (
	"backend/internal/types"
	"backend/pkg/library/errs"
	"backend/pkg/permission/domain/entity"
	"backend/pkg/permission/domain/token"
	"context"
	"github.com/zeromicro/go-zero/rest/httpx"

	"backend/pkg/permission/domain/usecase"
	uc "backend/pkg/permission/usecase"
	"net/http"
)

type AuthMiddlewareParam struct {
	TokenSec     string
	TokenUseCase usecase.TokenUseCase
}

type AuthMiddleware struct {
	TokenSec     string
	TokenUseCase usecase.TokenUseCase
}

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

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

			return
		}

		// 驗證 Token
		claim, err := uc.ParseClaims(header.Authorization, 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.StatusUnauthorized, "failed to verify toke",
				int64(100400))

			return
		}

		// 驗證 Token 是否在黑名單中
		if _, err := m.TokenUseCase.ValidationToken(r.Context(), entity.ValidationTokenReq{Token: header.Authorization}); err != nil {
			m.writeErrorResponse(w, r, http.StatusForbidden,
				"failed to get toke",
				int64(100400))

			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 uc.TokenClaims) context.Context {
	ctx := context.WithValue(r.Context(), token.KeyRole, claim.Role())
	ctx = context.WithValue(ctx, token.KeyUID, claim.UID())
	ctx = context.WithValue(ctx, token.KeyDeviceID, claim.DeviceID())
	ctx = context.WithValue(ctx, token.KeyScope, claim.Scope())
	ctx = context.WithValue(ctx, token.KeyLoginID, claim.LoginID())

	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.ErrorResp{
		Code: int(code),
		Msg:  message,
	})
}