/*
Copyright 2026 Arctel.net

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package cap

import (
	"net/http"

	"github.com/Rain-kl/Wavelet/internal/util"
	caputil "github.com/Rain-kl/Wavelet/internal/util/cap"
	"github.com/gin-gonic/gin"
)

// VerifyMiddleware returns a Gin middleware that checks and consumes the X-Cap-Token header.
// enabledFunc is an optional callback allowing dynamic check of whether captcha protection is turned on.
func VerifyMiddleware(mgr *caputil.Manager, scope string, enabledFunc func() bool) gin.HandlerFunc {
	return func(c *gin.Context) {
		if enabledFunc != nil && !enabledFunc() {
			c.Next()
			return
		}

		token := c.GetHeader("X-Cap-Token")
		if token == "" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, util.Err(errCapTokenMissing))
			return
		}

		valid, err := mgr.VerifyToken(c.Request.Context(), token, scope)
		if err != nil || !valid {
			c.AbortWithStatusJSON(http.StatusUnauthorized, util.Err(errCapTokenInvalidOrExpired))
			return
		}

		c.Next()
	}
}