import json
import os
import subprocess
import tempfile

from defence360agent.contracts.config import Core
from defence360agent.hooks import native as native_hooks
from defence360agent.internals.logger import EventHookLogger
from defence360agent.model.event_hook import EventHook
from defence360agent.model.instance import db
from defence360agent.utils import run, snake_case

event_hook_logger = EventHookLogger()


def get_hooks(event):
    # if database is not available (i.e. direct RPC call), do not try to
    # load hooks
    if db.deferred:
        return []
    hooks = EventHook.select().where(EventHook.event == event)
    return list(hooks)


async def execute_hook(path, data, native=False):
    try:
        if native:
            native_hooks.execute_hook(path, data)
            exit_code, err = 0, None
        else:
            data = json.dumps(data).encode()
            cwd = os.path.dirname(path)
            exit_code, _, err = await run(
                path, shell=True, input=data, cwd=cwd
            )
    except Exception as e:
        exit_code, err = None, repr(e)

    return exit_code, err


async def execute_hooks(event, tempdir=Core.TMPDIR):
    dump = event.get("DUMP")
    params = dict(event)
    hooks = get_hooks(event.event)

    if not hooks:
        return

    with event_hook_logger(event.event, event.subtype) as event_logger:
        if dump:
            prefix = snake_case(event.__class__.__name__) + "_"
            tmp = tempfile.NamedTemporaryFile(
                mode="w+", prefix=prefix, suffix=".json", dir=tempdir
            )
            json.dump(dump, tmp)
            tmp.flush()
            os.fsync(tmp.fileno())
            params["tmp_filename"] = tmp.name

        data = {
            "event": event.event,
            "subtype": event.subtype,
            "params": params,
        }

        for hook in hooks:
            with event_logger(hook.path, native=hook.native) as hook_logger:
                hook_logger.begin()
                exit_code, err = await execute_hook(
                    hook.path, data, native=hook.native
                )
                hook_logger.finish(exit_code, err)