package app

import (
	"context"
	"errors"
	"net/http"

	"github.com/99designs/gqlgen/graphql"
	"github.com/golang-jwt/jwt/v4"
)

// ExpiryMiddleware checks for expired tokens in GraphQL resolvers
func ExpiryMiddleware(ctx context.Context, next graphql.ResponseHandler) *graphql.Response {
	if IsTokenExpired(ctx) {
		return graphql.ErrorResponse(ctx, "token expired")
	}
	return next(ctx)
}

// AuthMiddleware parses JWT token and injects user context for HTTP requests
func AuthMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
		authHeader := r.Header.Get("Authorization")
		tokenStr, err := getTokenFromHeader(authHeader)
		if err != nil {
			ctx := SetStatus(r.Context(), err.Error())
			next.ServeHTTP(rw, r.WithContext(ctx))
			return
		}

		user, err := getUserFromToken(tokenStr)
		ctx := r.Context()

		if err != nil {
			ctx = SetStatus(ctx, err.Error())
			if errors.Is(err, jwt.ErrTokenExpired) {
				ctx = SetTokenExpired(ctx, true)
			}
			next.ServeHTTP(rw, r.WithContext(ctx))
			return
		}

		ctx = SetCurrentUser(ctx, user)
		ctx = SetStatus(ctx, "ok")
		next.ServeHTTP(rw, r.WithContext(ctx))
	})
}