#!/usr/bin/env python
"""Login/download/start the active application using ScriptEngine online API."""

from __future__ import print_function

import os

from _common import emit, load_payload


def main():
    payload = load_payload()
    project_path = payload.get("project_path")
    target_name = payload.get("target_name", "")
    start_application = bool(payload.get("start_application", False))
    force_download = bool(payload.get("force_download", True))

    if not project_path:
        raise ValueError("project_path is required.")
    pp = os.path.abspath(os.path.expanduser(project_path))
    if not os.path.exists(pp):
        raise RuntimeError("Project path does not exist: {0}".format(pp))
    if "projects" not in globals() or "online" not in globals():
        raise RuntimeError("Run through CODESYS ScriptEngine (--runscript).")

    if projects.primary:
        projects.primary.close()
    proj = projects.open(pp, primary=True, allow_readonly=False)
    app = proj.active_application
    if app is None:
        raise RuntimeError("No active application found in project.")

    online_app = online.create_online_application(app)
    # Try online change first; CODESYS handles download when needed.
    login_mode = OnlineChangeOption.Try if force_download else OnlineChangeOption.Never
    online_app.login(login_mode, True)

    started = False
    if start_application and online_app.application_state != ApplicationState.run:
        online_app.start()
        started = True

    online_app.logout()
    proj.close()

    emit(
        {
            "ok": True,
            "action": "download_to_device",
            "project_path": pp,
            "target_name": target_name,
            "start_application": start_application,
            "started": started,
        }
    )


if __name__ == "__main__":
    main()