package middlewares

import (
	"net/http"
	"strings"

	configs "goGin/config"
	"goGin/app/services"

	"github.com/gin-gonic/gin"
	"log"
)

const authClaimsKey = "auth_claims"

func RequireAuth(c *gin.Context) {
	authHeader := strings.TrimSpace(c.GetHeader("Authorization"))
	if authHeader == "" {
		authLogf("auth: missing Authorization header path=%s", c.Request.URL.Path)
		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "authorization header is required"})
		return
	}

	parts := strings.SplitN(authHeader, " ", 2)
	if len(parts) != 2 || !strings.EqualFold(parts[0], "Bearer") || strings.TrimSpace(parts[1]) == "" {
		authLogf("auth: invalid authorization format path=%s header=%s", c.Request.URL.Path, authHeader)
		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid authorization format, expected: Bearer <token>"})
		return
	}

	jwtService := services.NewJWTService()
	claims, err := jwtService.ValidateToken(strings.TrimSpace(parts[1]))
	if err != nil {
		authLogf("auth: invalid token path=%s error=%v", c.Request.URL.Path, err)
		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid token"})
		return
	}
	if claims.TokenType != services.TokenTypeAccess {
		authLogf("auth: non-access token used path=%s token_type=%s", c.Request.URL.Path, claims.TokenType)
		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "access token required"})
		return
	}

	c.Set(authClaimsKey, claims)
	c.Next()
}

func RequireAdmin(c *gin.Context) {
	claims, ok := GetAuthClaims(c)
	if !ok {
		authLogf("auth: RequireAdmin missing claims path=%s", c.Request.URL.Path)
		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "unauthorized"})
		return
	}
	if !claims.IsAdmin {
		authLogf("auth: RequireAdmin forbidden path=%s user_id=%v", c.Request.URL.Path, claims.UserID)
		c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "admin role required"})
		return
	}
	c.Next()
}

func RequireNormalUser(c *gin.Context) {
	claims, ok := GetAuthClaims(c)
	if !ok {
		authLogf("auth: RequireNormalUser missing claims path=%s", c.Request.URL.Path)
		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "unauthorized"})
		return
	}
	if claims.IsAdmin {
		authLogf("auth: RequireNormalUser forbidden (admin tried to access) path=%s user_id=%v", c.Request.URL.Path, claims.UserID)
		c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "only normal users can access this endpoint"})
		return
	}
	c.Next()
}

func GetAuthClaims(c *gin.Context) (*services.JWTClaim, bool) {
	raw, exists := c.Get(authClaimsKey)
	if !exists {
		return nil, false
	}
	claims, ok := raw.(*services.JWTClaim)
	return claims, ok
}

func authLogf(format string, args ...interface{}) {
	if configs.AppConfig != nil && configs.AppConfig.Debug {
		log.Printf(format, args...)
	}
}