package server

import (
	"io"
	"net/http"
	"time"

	"github.com/x-grk/longpolling-remote-access/internal/proto"
)

// fsOps maps the URL op segment to a proto task type.
var fsOps = map[string]string{
	"list":    proto.TaskFSList,
	"read":    proto.TaskFSRead,
	"write":   proto.TaskFSWrite,
	"mkdir":   proto.TaskFSMkdir,
	"delete":  proto.TaskFSDelete,
	"deltree": proto.TaskFSDelTree,
	"unzip":   proto.TaskFSUnzip,
	"zip":     proto.TaskFSZip,
	"move":    proto.TaskFSMove,
	"stat":    proto.TaskFSStat,
	"chmod":   proto.TaskFSChmod,
	"copy":    proto.TaskFSCopy,
}

// fsTaskTimeout bounds how long we wait for an agent to answer a file op.
const fsTaskTimeout = 60 * time.Second

func (s *Server) handleFilesPage(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	a, err := s.db.GetAgent(id)
	if err != nil || a == nil {
		http.NotFound(w, r)
		return
	}
	s.render(w, "files.html", map[string]any{"Agent": a, "EditLimit": proto.FSReadCap})
}

// POST /api/panel/agents/{id}/fs/{op} - run a file-manager operation on the
// agent and return its result. The request body is the op's JSON args and is
// forwarded verbatim to the agent.
func (s *Server) handleFSOp(w http.ResponseWriter, r *http.Request) {
	agentID := r.PathValue("id")
	op := r.PathValue("op")
	taskType, ok := fsOps[op]
	if !ok {
		http.Error(w, "unknown op", http.StatusBadRequest)
		return
	}
	a, err := s.db.GetAgent(agentID)
	if err != nil || a == nil {
		http.NotFound(w, r)
		return
	}
	if !s.online(a) {
		writeJSON(w, proto.TaskResult{Error: "машина офлайн"})
		return
	}
	args, err := io.ReadAll(http.MaxBytesReader(w, r.Body, 64<<20))
	if err != nil {
		http.Error(w, "bad request", http.StatusBadRequest)
		return
	}

	taskID, resultCh := s.hub.CreateTask(agentID, taskType, args)
	defer s.hub.DiscardTask(taskID)

	select {
	case res := <-resultCh:
		writeJSON(w, res)
	case <-time.After(fsTaskTimeout):
		writeJSON(w, proto.TaskResult{Error: "таймаут ожидания агента"})
	}
}