package middleware

import (
	"net/http"
	"strings"
	"time"

	"game-admin/internal/config"
	"game-admin/internal/models"

	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt/v5"
)

type Claims struct {
	UserID   int64       `json:"user_id"`
	Email    string      `json:"email"`
	Username string      `json:"username"`
	Role     models.Role `json:"role"`
	jwt.RegisteredClaims
}

func GenerateToken(user *models.User, cfg *config.Config) (string, error) {
	claims := Claims{
		UserID:   user.ID,
		Email:    user.Email,
		Username: user.Username,
		Role:     user.Role,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(time.Now().Add(72 * time.Hour)),
			IssuedAt:  jwt.NewNumericDate(time.Now()),
		},
	}
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	return token.SignedString([]byte(cfg.JWTSecret))
}

func AuthRequired(cfg *config.Config) gin.HandlerFunc {
	return func(c *gin.Context) {
		header := c.GetHeader("Authorization")
		if header == "" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Authorization header required"})
			return
		}
		parts := strings.SplitN(header, " ", 2)
		if len(parts) != 2 || parts[0] != "Bearer" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Invalid authorization format"})
			return
		}
		claims := &Claims{}
		token, err := jwt.ParseWithClaims(parts[1], claims, func(t *jwt.Token) (interface{}, error) {
			return []byte(cfg.JWTSecret), nil
		})
		if err != nil || !token.Valid {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Invalid or expired token"})
			return
		}
		c.Set("user_id", claims.UserID)
		c.Set("user_email", claims.Email)
		c.Set("user_role", claims.Role)
		c.Set("username", claims.Username)
		c.Next()
	}
}

func RoleRequired(roles ...models.Role) gin.HandlerFunc {
	return func(c *gin.Context) {
		role, _ := c.Get("user_role")
		userRole := role.(models.Role)
		for _, r := range roles {
			if userRole == r {
				c.Next()
				return
			}
		}
		c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "Insufficient permissions"})
	}
}