package app

import (
	"os"
	appcli "selective-vpn-api/app/cli"
)

// EN: Application entrypoint and process bootstrap.
// EN: This file wires CLI modes and delegates API runtime bootstrap.
// RU: Точка входа приложения и bootstrap процесса.
// RU: Этот файл связывает CLI-режимы и делегирует запуск API-сервера.
func Run() {
	if code, handled := runLegacyCLIMode(os.Args[1:]); handled {
		if code != 0 {
			os.Exit(code)
		}
		return
	}
	RunAPIServer()
}

// RunAPIServer starts the HTTP/SSE API server mode.
func RunAPIServer() {
	runAPIServerAtAddr("127.0.0.1:8080")
}

// RunRoutesUpdateCLI executes one-shot routes update mode.
func RunRoutesUpdateCLI(args []string) int {
	return appcli.RunRoutesUpdate(args, appcli.RoutesUpdateDeps{
		LockFile: lockFile,
		Update: func(iface string) (bool, string) {
			res := routesUpdate(iface)
			return res.OK, res.Message
		},
		Stdout: os.Stdout,
		Stderr: os.Stderr,
	})
}

// RunRoutesClearCLI executes one-shot routes clear mode.
func RunRoutesClearCLI(args []string) int {
	return appcli.RunRoutesClear(args, appcli.RoutesClearDeps{
		Clear: func() (bool, string) {
			res := routesClear()
			return res.OK, res.Message
		},
		Stdout: os.Stdout,
		Stderr: os.Stderr,
	})
}

// RunAutoloopCLI executes autoloop mode.
func RunAutoloopCLI(args []string) int {
	return appcli.RunAutoloop(args, appcli.AutoloopDeps{
		StateDirDefault: stateDir,
		ResolveIface: func(flagIface string) string {
			resolvedIface := normalizePreferredIface(flagIface)
			if resolvedIface == "" {
				resolvedIface, _ = resolveTrafficIface(loadTrafficModeState().PreferredIface)
			}
			return resolvedIface
		},
		Run: func(params appcli.AutoloopParams) {
			runAutoloop(
				params.Iface,
				params.Table,
				params.MTU,
				params.StateDir,
				params.DefaultLocation,
			)
		},
		Stderr: os.Stderr,
	})
}

func runLegacyCLIMode(args []string) (int, bool) {
	if len(args) == 0 {
		return 0, false
	}
	switch args[0] {
	case "routes-update", "-routes-update":
		return RunRoutesUpdateCLI(args[1:]), true
	case "routes-clear":
		return RunRoutesClearCLI(args[1:]), true
	case "autoloop":
		return RunAutoloopCLI(args[1:]), true
	default:
		return 0, false
	}
}