#!/usr/bin/env python3
"""
Apply elasticsearch mappings to given hosts.
"""
import argparse
import json
import logging
from pathlib import Path
from typing import Optional, Sequence, Tuple

from elasticsearch import Elasticsearch

HERE = Path(__file__).resolve().parent
logging.getLogger('elasticsearch').setLevel(logging.WARNING)
logging.getLogger('elastic_transport').setLevel(logging.WARNING)


def apply_mappings_to_cluster(
    hosts: Sequence, key: Optional[str] = None, es_args: dict = None, http_auth: Tuple = None
):
    """Hosts maybe a sequence of strings or dicts in the form {"host": <host>, "port": <port>}"""

    def _send_component_template(ct_file):
        with ct_file.open() as json_data:
            body = json.load(json_data)
            template_name = f"{ct_file.stem}"
            res = es.cluster.put_component_template(name=template_name, body=body)
            return {"component_template": template_name, "result": res}

    def _send_index_template(it_file):
        with it_file.open() as json_data:
            body = json.load(json_data)
            template_name = f"{it_file.stem}"
            res = es.indices.put_index_template(name=template_name, body=body)
            return {"index_template": template_name, "result": res}

    def _send_template(f):
        with f.open() as json_data:
            data = json.load(json_data)
            template_name = f.stem
            res = es.indices.put_template(name=template_name, body=data)
            return {"mapping": template_name, "result": res}

    es = Elasticsearch(hosts=hosts, http_auth=http_auth, **(es_args or {}))
    p = HERE / "index_templates"
    if key:
        folders = [p / key]
    else:
        folders = [
            f for f in p.iterdir() if f.is_dir()
        ]

    ret = []
    for f in folders:
        for ct in (f / "component_templates").glob("*.json"):
            ret.append(_send_component_template(ct))
        for it in f.glob("*.json"):
            ret.append(_send_index_template(it))

    return ret
    # p = HERE / "mappings"
    # if key:
    #     files = (p / key).glob("*.json")
    # else:
    #     files = p.glob("**/*.json")
    #
    # return [_send_template(f) for f in files]


def parse_args():
    parser = argparse.ArgumentParser(
        description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter
    )
    parser.add_argument("--key", help="host key, e.g. events, datasets etc.")
    parser.add_argument(
        "--hosts",
        nargs="+",
        help="list of es hosts from the same cluster, where each host is http[s]://[user:password@]host:port",
    )
    return parser.parse_args()


def main():
    args = parse_args()
    print(">>>>> Applying mapping to " + str(args.hosts))
    res = apply_mappings_to_cluster(args.hosts, args.key)
    print(res)


if __name__ == "__main__":
    main()