import json
import logging
import re

import jsonschema

CONFIG_SCHEMA = {
    "$schema": "http://json-schema.org/draft-07/schema#",

    "definitions": {
        "database_credentials": {
            "type": "object",
            "properties": {
                "hostname": {"type": "string"},
                "dbname": {"type": "string"},
                "username": {"type": "string"},
                "password": {"type": "string"}
            },
            "required": ["hostname", "dbname", "username", "password"],
            "additionalProperties": False

        }
    },

    "type": "object",
    "properties": {
        "alarms-db": {"$ref": "#/definitions/database_credentials"},
        "ops-db": {"$ref": "#/definitions/database_credentials"},
        "oid_list.conf": {"type": "string"},
        "ssh": {
            "type": "object",
            "properties": {
                "username": {"type": "string"},
                "private-key": {"type": "string"},
                "known-hosts": {"type": "string"}
            },
            "required": ["private-key", "known-hosts"],
            "additionalProperties": False
        },
        "redis": {
            "type": "object",
            "properties": {
                "hostname": {"type": "string"},
                "port": {"type": "integer"}
            },
            "required": ["hostname", "port"],
            "additionalProperties": False
        },
        "junosspace": {
            "api": {"type": "string"},
            "username": {"type": "string"},
            "password": {"type": "string"}
        },
        "infinera-dna": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "name": {"type": "string"},
                    "address": {"type": "string"}
                },
                "required": ["name", "address"],
                "additionalProperties": False
            }
        },
        "coriant-tnms": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "name": {"type": "string"},
                    "address": {"type": "string"}
                },
                "required": ["name", "address"],
                "additionalProperties": False
            }
        }
    },
    "required": [
        "alarms-db",
        "ops-db",
        "oid_list.conf",
        "ssh",
        "redis",
        "junosspace",
        "infinera-dna",
        "coriant-tnms"],
    "additionalProperties": False
}


def _load_oids(config_file):
    """
    :param config_file: file-like object
    :return:
    """
    result = {}
    for line in config_file:
        m = re.match(r'^([^=]+)=(.*)\s*$', line)
        if m:
            result[m.group(1)] = m.group(2)
    return result


# def _load_routers(config_file):
#     """
#     :param config_file: file-like object
#     :return:
#     """
#     for line in config_file:
#         m = re.match(
#             r'^([a-z\d]+\.[a-z\d]{3,4}\.[a-z\d]{2}'
#             r'\.(geant|eumedconnect)\d*\.net)\s*=([^,]+)\s*,(.*)\s*$',
#             line)
#         if not m:
#             logging.warning("malformed config file line: '%s'" % line.strip())
#             continue
#         yield {
#             "hostname": m.group(1),
#             "community": m.group(3),
#             "address": m.group(4)
#         }


def load(f):
    """
    loads, validates and returns configuration parameters

    :param f: file-like object that produces the config file
    :return:
    """
    config = json.loads(f.read())
    jsonschema.validate(config, CONFIG_SCHEMA)
    with open(config["oid_list.conf"]) as f:
        config["oids"] = _load_oids(f)
    # with open(config["routers_community.conf"]) as f:
    #     config["routers"] = list(_load_routers(f))
    return config