package api //nolint:revive

import (
	"embed"
	"net/http"
	"path"
	"strings"

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

//go:embed admin/*
var adminAssets embed.FS

var adminContentTypes = map[string]string{
	".css":  "text/css; charset=utf-8",
	".html": "text/html; charset=utf-8",
	".js":   "text/javascript; charset=utf-8",
}

func setAdminSecurityHeaders(ctx *gin.Context) {
	ctx.Header("Content-Security-Policy", "default-src 'self'; script-src 'self'; style-src 'self'; "+
		"connect-src 'self'; frame-src http: https:; img-src 'self' data:; "+
		"object-src 'none'; base-uri 'none'; form-action 'self'; frame-ancestors 'self'")
	ctx.Header("Referrer-Policy", "no-referrer")
	ctx.Header("X-Content-Type-Options", "nosniff")
	ctx.Header("X-Frame-Options", "SAMEORIGIN")
}

func (a *API) onAdminRedirect(ctx *gin.Context) {
	ctx.Redirect(http.StatusMovedPermanently, "/admin/")
}

func (a *API) onAdminAsset(ctx *gin.Context) {
	assetPath := strings.TrimPrefix(ctx.Param("path"), "/")
	if assetPath == "" {
		assetPath = "index.html"
	}

	assetPath = path.Clean(assetPath)
	if assetPath == "." || strings.HasPrefix(assetPath, "../") {
		ctx.Status(http.StatusNotFound)
		return
	}

	byts, err := adminAssets.ReadFile("admin/" + assetPath)
	if err != nil {
		ctx.Status(http.StatusNotFound)
		return
	}

	contentType, ok := adminContentTypes[path.Ext(assetPath)]
	if !ok {
		ctx.Status(http.StatusNotFound)
		return
	}

	setAdminSecurityHeaders(ctx)
	if assetPath == "index.html" {
		ctx.Header("Cache-Control", "no-store")
	} else {
		ctx.Header("Cache-Control", "no-cache")
	}
	ctx.Data(http.StatusOK, contentType, byts)
}