package middleware

import (
	"context"
	"log"
	"net/http"
	"ristek-task-be/internal/jwt"
	"strings"
)

type wrapper struct {
	http.ResponseWriter
	request    *http.Request
	statusCode int
}

func (w *wrapper) WriteHeader(code int) {
	w.statusCode = code
	w.ResponseWriter.WriteHeader(code)
	return
}

func ClientIP(request *http.Request) string {
	ip := request.Header.Get("Cf-Connecting-IP")
	if ip != "" {
		return ip
	}
	ip = request.Header.Get("X-Real-IP")
	if ip == "" {
		ip = request.Header.Get("X-Forwarded-For")
		if ip == "" {
			ip = request.RemoteAddr
		}
	}

	if strings.Contains(ip, ",") {
		ips := strings.Split(ip, ",")
		ip = strings.TrimSpace(ips[0])
	}

	if strings.Contains(ip, ":") {
		ips := strings.Split(ip, ":")
		ip = ips[0]
	}

	return ip
}

func Handler(next http.Handler) http.Handler {
	return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
		wrappedWriter := &wrapper{
			ResponseWriter: writer,
			request:        request,
			statusCode:     http.StatusOK,
		}

		next.ServeHTTP(wrappedWriter, request)
		log.Printf("%s %s %s %v", ClientIP(request), request.Method, request.RequestURI, wrappedWriter.statusCode)
	})
}

type contextKey string

const UserIDKey contextKey = "user_id"

func CORS(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
		w.Header().Set("Access-Control-Max-Age", "86400")

		if r.Method == http.MethodOptions {
			w.WriteHeader(http.StatusNoContent)
			return
		}

		next.ServeHTTP(w, r)
	})
}

func Auth(j *jwt.JWT) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			authHeader := r.Header.Get("Authorization")
			if authHeader == "" || !strings.HasPrefix(authHeader, "Bearer ") {
				http.Error(w, "unauthorized", http.StatusUnauthorized)
				return
			}

			tokenStr := strings.TrimPrefix(authHeader, "Bearer ")

			userID, err := j.ValidateAccessToken(tokenStr)
			if err != nil {
				http.Error(w, "unauthorized", http.StatusUnauthorized)
				return
			}

			ctx := context.WithValue(r.Context(), UserIDKey, userID)
			next.ServeHTTP(w, r.WithContext(ctx))
		})
	}
}