package controllers

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

	"github.com/owncast/owncast/config"
	"github.com/owncast/owncast/core"
	"github.com/owncast/owncast/core/data"
	"github.com/owncast/owncast/router/middleware"
	"github.com/owncast/owncast/utils"
)

// HandleHLSRequest will manage all requests to HLS content.
func HandleHLSRequest(w http.ResponseWriter, r *http.Request) {
	// Sanity check to limit requests to HLS file types.
	if filepath.Ext(r.URL.Path) != ".m3u8" && filepath.Ext(r.URL.Path) != ".ts" {
		w.WriteHeader(http.StatusNotFound)
		return
	}

	requestedPath := r.URL.Path
	relativePath := strings.Replace(requestedPath, "/hls/", "", 1)
	fullPath := filepath.Join(config.HLSStoragePath, relativePath)

	// If using external storage then only allow requests for the
	// master playlist at stream.m3u8, no variants or segments.
	if data.GetS3Config().Enabled && relativePath != "stream.m3u8" {
		w.WriteHeader(http.StatusNotFound)
		return
	}

	// Handle playlists
	if path.Ext(r.URL.Path) == ".m3u8" {
		// Playlists should never be cached.
		middleware.DisableCache(w)

		// Use this as an opportunity to mark this viewer as active.
		id := utils.GenerateClientIDFromRequest(r)
		core.SetViewerIDActive(id)
	} else {
		cacheTime := utils.GetCacheDurationSecondsForPath(relativePath)
		w.Header().Set("Cache-Control", "public, max-age="+strconv.Itoa(cacheTime))
	}

	http.ServeFile(w, r, fullPath)
}