package middleware

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

// SecurityHeaders adds standard security headers to every response
func SecurityHeaders() gin.HandlerFunc {
	return func(c *gin.Context) {
		// Prevent MIME type sniffing
		c.Writer.Header().Set("X-Content-Type-Options", "nosniff")

		// Prevent clickjacking
		c.Writer.Header().Set("X-Frame-Options", "DENY")

		// Enable XSS protection
		c.Writer.Header().Set("X-XSS-Protection", "1; mode=block")

		csp := "default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data: blob: https:; font-src 'self' data:;"
		if gin.Mode() == gin.DebugMode {
			// Development keeps relaxed directives for the local Vite/React toolchain.
			csp = "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: https:; font-src 'self' data:;"
		}
		c.Writer.Header().Set("Content-Security-Policy", csp)

		// Strict Transport Security (HSTS) - Enabled for 1 year in Production
		if gin.Mode() == gin.ReleaseMode {
			c.Writer.Header().Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains")
		}

		c.Next()
	}
}