package api

import (
	"net/http"
	"strconv"
	"strings"

	"github.com/gin-gonic/gin"

	"hightube/internal/utils"
)

// AuthMiddleware intercepts requests, validates JWT, and injects user_id into context
func AuthMiddleware() gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Authorization header is required"})
			c.Abort()
			return
		}

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

		tokenStr := parts[1]
		userIDStr, err := utils.ParseToken(tokenStr)
		if err != nil {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid or expired token"})
			c.Abort()
			return
		}

		userID, _ := strconv.ParseUint(userIDStr, 10, 32)
		c.Set("user_id", uint(userID))
		c.Next()
	}
}