package middleware

import (
	"context"

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

const RequestIDKey = "X-Request-ID"

// RequestID middleware adds a unique request ID to each request
func RequestID() gin.HandlerFunc {
	return func(c *gin.Context) {
		// Check if request already has an ID
		requestID := c.GetHeader(RequestIDKey)
		if requestID == "" {
			requestID = uuid.New().String()
		}

		// Set request ID in header and context
		c.Header(RequestIDKey, requestID)
		c.Set(RequestIDKey, requestID)

		// Add request ID to context for logging
		ctx := context.WithValue(c.Request.Context(), RequestIDKey, requestID)
		c.Request = c.Request.WithContext(ctx)

		c.Next()
	}
}