import json
import re
from ._core import log
from . import _util, _exception

# Shameless copy from https://stackoverflow.com/a/8730674
FLAGS = re.VERBOSE | re.MULTILINE | re.DOTALL
WHITESPACE = re.compile(r"[ \t\n\r]*", FLAGS)


class ConcatJSONDecoder(json.JSONDecoder):
    def decode(self, s, _w=WHITESPACE.match):
        s_len = len(s)

        objs = []
        end = 0
        while end != s_len:
            obj, end = self.raw_decode(s, idx=_w(s, end).end())
            end = _w(s, end).end()
            objs.append(obj)
        return objs


# End shameless copy


def queries_to_json(*queries):
    """
    Queries should be a list of GraphQL objects
    """
    rtn = {}
    for i, query in enumerate(queries):
        rtn["q{}".format(i)] = query
    return _util.json_minimal(rtn)


def response_to_json(content):
    content = _util.strip_json_cruft(content)  # Usually only needed in some error cases
    try:
        j = json.loads(content, cls=ConcatJSONDecoder)
    except Exception:
        raise _exception.FBchatException(
            "Error while parsing JSON: {!r}".format(content)
        )

    rtn = [None] * (len(j))
    for x in j:
        if "error_results" in x:
            del rtn[-1]
            continue
        _util.handle_payload_error(x)
        [(key, value)] = x.items()
        _util.handle_graphql_errors(value)
        if "response" in value:
            rtn[int(key[1:])] = value["response"]
        else:
            rtn[int(key[1:])] = value["data"]

    log.debug(rtn)

    return rtn


def from_query(query, params):
    return {"priority": 0, "q": query, "query_params": params}


def from_query_id(query_id, params):
    return {"query_id": query_id, "query_params": params}


def from_doc(doc, params):
    return {"doc": doc, "query_params": params}


def from_doc_id(doc_id, params):
    return {"doc_id": doc_id, "query_params": params}


FRAGMENT_USER = """
QueryFragment User: User {
    id,
    name,
    first_name,
    last_name,
    profile_picture.width(<pic_size>).height(<pic_size>) {
        uri
    },
    is_viewer_friend,
    url,
    gender,
    viewer_affinity
}
"""

FRAGMENT_GROUP = """
QueryFragment Group: MessageThread {
    name,
    thread_key {
        thread_fbid
    },
    image {
        uri
    },
    is_group_thread,
    all_participants {
        nodes {
            messaging_actor {
                id
            }
        }
    },
    customization_info {
        participant_customizations {
            participant_id,
            nickname
        },
        outgoing_bubble_color,
        emoji
    },
    thread_admins {
        id
    },
    group_approval_queue {
        nodes {
            requester {
                id
            }
        }
    },
    approval_mode,
    joinable_mode {
        mode,
        link
    },
    event_reminders {
        nodes {
            id,
            lightweight_event_creator {
                id
            },
            time,
            location_name,
            event_title,
            event_reminder_members {
                edges {
                    node {
                        id
                    },
                    guest_list_state
                }
            }
        }
    }
}
"""

FRAGMENT_PAGE = """
QueryFragment Page: Page {
    id,
    name,
    profile_picture.width(32).height(32) {
        uri
    },
    url,
    category_type,
    city {
        name
    }
}
"""

SEARCH_USER = (
    """
Query SearchUser(<search> = '', <limit> = 10) {
    entities_named(<search>) {
        search_results.of_type(user).first(<limit>) as users {
            nodes {
                @User
            }
        }
    }
}
"""
    + FRAGMENT_USER
)

SEARCH_GROUP = (
    """
Query SearchGroup(<search> = '', <limit> = 10, <pic_size> = 32) {
    viewer() {
        message_threads.with_thread_name(<search>).last(<limit>) as groups {
            nodes {
                @Group
            }
        }
    }
}
"""
    + FRAGMENT_GROUP
)

SEARCH_PAGE = (
    """
Query SearchPage(<search> = '', <limit> = 10) {
    entities_named(<search>) {
        search_results.of_type(page).first(<limit>) as pages {
            nodes {
                @Page
            }
        }
    }
}
"""
    + FRAGMENT_PAGE
)

SEARCH_THREAD = (
    """
Query SearchThread(<search> = '', <limit> = 10) {
    entities_named(<search>) {
        search_results.first(<limit>) as threads {
            nodes {
                __typename,
                @User,
                @Group,
                @Page
            }
        }
    }
}
"""
    + FRAGMENT_USER
    + FRAGMENT_GROUP
    + FRAGMENT_PAGE
)
