package middleware

import (
	"github.com/gofiber/fiber/v2"

	"wucher/internal/service"
	"wucher/internal/shared/pkg/apperrorsx"
)

const pinVerificationHeader = "X-PIN-Verification-Token"

func PinRequired(svc *service.AuthService, action string) fiber.Handler {
	return pinRequired(svc, action, "", true)
}

func PinRequiredForPermission(svc *service.AuthService, action, permissionKey string) fiber.Handler {
	return pinRequired(svc, action, permissionKey, true)
}

func PinRequiredReusable(svc *service.AuthService, action string) fiber.Handler {
	return pinRequired(svc, action, "", false)
}

func PinRequiredReusableForPermission(svc *service.AuthService, action, permissionKey string) fiber.Handler {
	return pinRequired(svc, action, permissionKey, false)
}

func pinRequired(svc *service.AuthService, action, permissionKey string, consume bool) fiber.Handler {
	return func(c *fiber.Ctx) error {
		if svc == nil {
			e := apperrorsx.New(apperrorsx.ErrUserUnauthorized)
			e.Message = "auth service not configured"
			return apperrorsx.Write(c, e)
		}

		raw := c.Locals("user_id")
		userID, ok := raw.([]byte)
		if !ok || len(userID) == 0 {
			e := apperrorsx.New(apperrorsx.ErrUserUnauthorized)
			e.Message = "missing auth context"
			return apperrorsx.Write(c, e)
		}

		if permissionKey != "" {
			required, err := svc.PermissionRequiresPIN(c.UserContext(), permissionKey)
			if err != nil {
				e := apperrorsx.New(apperrorsx.ErrForbiddenAccess)
				e.Message = "failed to verify PIN requirement"
				return apperrorsx.Write(c, e)
			}
			if !required {
				return c.Next()
			}
		}

		token := c.Get(pinVerificationHeader)
		sessionID := ""
		for _, accessToken := range service.CookieValues(c.Get(fiber.HeaderCookie), svc.AccessCookieName()) {
			sid, err := svc.ParseAccessTokenSessionID(c.UserContext(), accessToken)
			if err == nil {
				sessionID = sid
				break
			}
		}
		if sessionID == "" {
			return apperrorsx.Write(c, apperrorsx.New(apperrorsx.ErrTokenInvalid))
		}

		var err error
		if consume {
			err = svc.ConsumeSecurityPINActionTokenInSession(c.UserContext(), userID, action, token, sessionID)
		} else {
			err = svc.ValidateSecurityPINActionTokenInSession(c.UserContext(), userID, action, token, sessionID)
		}
		if err != nil {
			return apperrorsx.Write(c, apperrorsx.New(apperrorsx.ErrPINVerificationRequired202))
		}
		return c.Next()
	}
}