import os
from collections import defaultdict
from functools import reduce


class DefaultCallback:
    STATUS_MAPPER = {
        'successful': 'success',
        'failure': 'failed',
        'failed': 'failed',
        'running': 'running',
        'pending': 'pending',
        'timeout': 'timeout',
        'unknown': 'unknown'
    }

    def __init__(self):
        self.result = dict(
            ok=defaultdict(dict),
            failures=defaultdict(dict),
            dark=defaultdict(dict),
            skipped=defaultdict(dict),
            ignored=defaultdict(dict),
        )
        self.summary = dict(
            ok=[],
            failures={},
            dark={},
            skipped=[],
        )
        self.status = 'running'
        self.finished = False
        self.local_pid = 0
        self.private_data_dir = None

    @property
    def host_results(self):
        results = {}
        for state, hosts in self.result.items():
            for host, items in hosts.items():
                results[host] = items
        return results

    def is_success(self):
        return self.status != 'success'

    def event_handler(self, data, **kwargs):
        event = data.get('event', None)
        if not event:
            return

        pid = data.get('pid', None)
        if pid:
            self.write_pid(pid)

        event_data = data.get('event_data', {})
        host = event_data.get('remote_addr', '')
        task = event_data.get('task', '')
        res = event_data.get('res', {})
        handler = getattr(self, event, self.on_any)
        handler(event_data, host=host, task=task, res=res)

    def runner_on_ok(self, event_data, host=None, task=None, res=None):
        detail = {
            'action': event_data.get('task_action', ''),
            'res': res,
            'rc': res.get('rc', 0),
            'stdout': res.get('stdout', ''),
        }
        self.result['ok'][host][task] = detail

    def runner_on_skipped(self, event_data, host=None, task=None, **kwargs):
        detail = {
            'action': event_data.get('task_action', ''),
            'res': {},
            'rc': 0,
        }
        self.result['skipped'][host][task] = detail

    def runner_on_failed(self, event_data, host=None, task=None, res=None, **kwargs):
        detail = {
            'action': event_data.get('task_action', ''),
            'res': res,
            'rc': res.get('rc', 0),
            'stdout': res.get('stdout', ''),
            'stderr': ';'.join([res.get('stderr', ''), res.get('msg', '')]).strip(';')
        }
        ignore_errors = event_data.get('ignore_errors', False)
        error_key = 'ignored' if ignore_errors else 'failures'
        self.result[error_key][host][task] = detail

    def runner_on_unreachable(self, event_data, host=None, task=None, res=None, **kwargs):
        detail = {
            'action': event_data.get('task_action', ''),
            'res': res,
            'rc': 255,
            'stderr': ';'.join([res.get('stderr', ''), res.get('msg', '')]).strip(';')
        }
        self.result['dark'][host][task] = detail

    def runner_on_start(self, event_data, **kwargs):
        pass

    def runner_retry(self, event_data, **kwargs):
        pass

    def runner_on_file_diff(self, event_data, **kwargs):
        pass

    def runner_item_on_failed(self, event_data, **kwargs):
        pass

    def runner_item_on_skipped(self, event_data, **kwargs):
        pass

    def playbook_on_play_start(self, event_data, **kwargs):
        pass

    def playbook_on_stats(self, event_data, **kwargs):
        error_func = lambda err, task_detail: err + f"{task_detail[0]}: {task_detail[1]['stderr']};"
        for tp in ['dark', 'failures']:
            for host, tasks in self.result[tp].items():
                error = reduce(error_func, tasks.items(), '').strip(';')
                self.summary[tp][host] = error
        failures = list(self.result['failures'].keys())
        dark_or_failures = list(self.result['dark'].keys()) + failures

        for host, tasks in self.result.get('ignored', {}).items():
            ignore_errors = reduce(error_func, tasks.items(), '').strip(';')
            if host in failures:
                self.summary['failures'][host] += ignore_errors

        self.summary['ok'] = list(set(self.result['ok'].keys()) - set(dark_or_failures))
        self.summary['skipped'] = list(set(self.result['skipped'].keys()) - set(dark_or_failures))

    def playbook_on_include(self, event_data, **kwargs):
        pass

    def playbook_on_notify(self, event_data, **kwargs):
        pass

    def playbook_on_vars_prompt(self, event_data, **kwargs):
        pass

    def playbook_on_handler_task_start(self, event_data, **kwargs):
        pass

    def playbook_on_no_hosts_matched(self, event_data, **kwargs):
        pass

    def playbook_on_no_hosts_remaining(self, event_data, **kwargs):
        pass

    def warning(self, event_data, **kwargs):
        pass

    def on_any(self, event_data, **kwargs):
        pass

    def status_handler(self, data, **kwargs):
        status = data.get('status', '')
        self.status = self.STATUS_MAPPER.get(status, 'unknown')
        self.private_data_dir = data.get("private_data_dir", None)

    def write_pid(self, pid):
        pid_filepath = os.path.join(self.private_data_dir, 'local.pid')
        with open(pid_filepath, 'w') as f:
            f.write(str(pid))