package middlewares

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt/v5"
	"net/http"
	"os"
	"time"

	"git.dynamicdiscord.de/harakat/backend/repositories"
)

type AuthValidator struct {
}

func (av *AuthValidator) RequireAuth(c *gin.Context) {
	// Get Cookie
	tokenString, err := c.Cookie("Authorization")

	if err != nil {
		c.AbortWithStatus(http.StatusUnauthorized)
		return
	}

	//Validate
	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (any, error) {
		// Don't forget to validate the alg is what you expect:
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
		}

		// hmacSampleSecret is a []byte containing your secret, e.g. []byte("my_secret_key")
		return []byte(os.Getenv("SECRET")), nil
	})

	if err != nil {
		c.AbortWithStatus(http.StatusUnauthorized)
		return
	}

	if claims, ok := token.Claims.(jwt.MapClaims); ok {
		//Check Expiration
		if float64(time.Now().Unix()) > claims["exp"].(float64) {
			//expired
			c.AbortWithStatus(http.StatusUnauthorized)
			return
		}

		//Find user
		user, err := repositories.Users.GetById(claims["sub"])

		if err != nil {
			c.AbortWithStatus(http.StatusUnauthorized)
			return
		}

		//Attach to req
		c.Set("user", user)

		// Coninue
		c.Next()
		return
	}

	c.AbortWithStatus(http.StatusUnauthorized)
}

func (av *AuthValidator) RequireAdmin(c *gin.Context) {
	// Get Cookie
	tokenString, err := c.Cookie("Authorization")

	if err != nil {
		c.AbortWithStatus(http.StatusUnauthorized)
		return
	}

	//Validate
	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (any, error) {
		// Don't forget to validate the alg is what you expect:
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
		}

		// hmacSampleSecret is a []byte containing your secret, e.g. []byte("my_secret_key")
		return []byte(os.Getenv("SECRET")), nil
	})

	if err != nil {
		c.AbortWithStatus(http.StatusUnauthorized)
		return
	}

	if claims, ok := token.Claims.(jwt.MapClaims); ok {
		//Check Expiration
		if float64(time.Now().Unix()) > claims["exp"].(float64) {
			//expired
			c.AbortWithStatus(http.StatusUnauthorized)
			return
		}

		//Find user
		user, err := repositories.Users.GetById(claims["sub"])

		if err != nil {
			c.AbortWithStatus(http.StatusUnauthorized)
			return
		}

		if !user.IsAdmin {
			c.AbortWithStatus(http.StatusUnauthorized)
			return
		}

		//Attach to req
		c.Set("user", user)

		// Coninue
		c.Next()
		return
	}

	c.AbortWithStatus(http.StatusUnauthorized)
}

func (av *AuthValidator) OptionalAuth(c *gin.Context) {
	defer c.Next()

	// Get Cookie
	tokenString, err := c.Cookie("Authorization")

	if err != nil {
		return
	}

	//Validate
	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (any, error) {
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
		}
		return []byte(os.Getenv("SECRET")), nil
	})

	if err != nil {
		return
	}

	if claims, ok := token.Claims.(jwt.MapClaims); ok {
		if float64(time.Now().Unix()) > claims["exp"].(float64) {
			return
		}

		//Find user
		user, err := repositories.Users.GetById(claims["sub"])

		if err != nil {
			return
		}

		//Attach to req
		c.Set("user", user)
	}
}