package app

import (
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"strings"
)

func handleFixPolicyRoute(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	data, err := os.ReadFile(statusFilePath)
	if err != nil {
		http.Error(w, "status.json missing", http.StatusBadRequest)
		return
	}
	var st Status
	if err := json.Unmarshal(data, &st); err != nil {
		http.Error(w, "invalid status.json", http.StatusBadRequest)
		return
	}

	iface := strings.TrimSpace(st.Iface)
	table := strings.TrimSpace(st.Table)
	if iface == "" || iface == "-" || table == "" || table == "-" {
		http.Error(w, "iface/table unknown in status.json", http.StatusBadRequest)
		return
	}

	stdout, stderr, exitCode, err := runCommand(
		"ip", "-4", "route", "replace",
		"default", "dev", iface, "table", table, "mtu", policyRouteMTU,
	)

	ok := err == nil && exitCode == 0
	res := cmdResult{
		OK:       ok,
		ExitCode: exitCode,
		Stdout:   stdout,
		Stderr:   stderr,
	}
	if ok {
		res.Message = fmt.Sprintf("policy route fixed: default dev %s table %s", iface, table)
	} else if err != nil {
		res.Message = err.Error()
	}

	writeJSON(w, http.StatusOK, res)
}