package middleware

import (
	services "api-service/internal/services/auth"
	"net/http"
	"strings"

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

// JWTAuthMiddleware validates JWT tokens generated by our auth service
func JWTAuthMiddleware(authService *services.AuthService) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Authorization header missing"})
			return
		}

		parts := strings.SplitN(authHeader, " ", 2)
		if len(parts) != 2 || strings.ToLower(parts[0]) != "bearer" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Authorization header format must be Bearer {token}"})
			return
		}

		tokenString := parts[1]

		// Validate token
		claims, err := authService.ValidateToken(tokenString)
		if err != nil {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": err.Error()})
			return
		}

		// Set user info in context
		c.Set("user_id", claims.UserID)
		c.Set("username", claims.Username)
		c.Set("email", claims.Email)
		c.Set("role", claims.Role)

		c.Next()
	}
}

// OptionalAuthMiddleware allows both authenticated and unauthenticated requests
func OptionalAuthMiddleware(authService *services.AuthService) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			// No token provided, but continue
			c.Next()
			return
		}

		parts := strings.SplitN(authHeader, " ", 2)
		if len(parts) != 2 || strings.ToLower(parts[0]) != "bearer" {
			c.Next()
			return
		}

		tokenString := parts[1]
		claims, err := authService.ValidateToken(tokenString)
		if err != nil {
			// Invalid token, but continue (don't abort)
			c.Next()
			return
		}

		// Set user info in context
		c.Set("user_id", claims.UserID)
		c.Set("username", claims.Username)
		c.Set("email", claims.Email)
		c.Set("role", claims.Role)

		c.Next()
	}
}
