import connexion
from typing import Dict
from typing import Tuple
from typing import Union

from openapi_server.models.patch_notes import PatchNotes  # noqa: E501
from openapi_server.models.patch_notes_input import PatchNotesInput  # noqa: E501
from openapi_server import util
import logging
import uuid
from datetime import datetime, date

from bson import json_util
from connexion import ProblemException
from flask import Response
from __main__ import collection

from openapi_server.__main__ import collection
from openapi_server.models.patch_notes import PatchNotes


def create_patchnote(body):  # noqa: E501
    """Creates new patch notes

     # noqa: E501

    :param body:
    :param patch_notes_input:
    :type patch_notes_input: dict | bytes

    :rtype: Union[PatchNotes, Tuple[PatchNotes, int], Tuple[PatchNotes, int, Dict[str, str]]
    """
    patch_notes_input = body
    if body is None:
        return Response('error: No patch notes provided', status=400)
    pn = PatchNotes.from_dict(body)
    try:
        date_obj = datetime.strptime(pn.patch_date, '%Y-%m-%d').date()
        date_str = date_obj.strftime('%Y-%m-%d')
    except ValueError as e:
        raise ProblemException(
            title="Bad Request",
            detail="The date is invalid. Needs to be in this Format YYYY-MM-DD",
            status=400,
        )

    patch_note = {
        'patchID': str(uuid.uuid4()),
        'title': pn.title,
        'changes': pn.changes,
        'version': pn.version,
        'patch_date': date_str
    }

    collection.insert_one(patch_note)
    patch_note_obj = PatchNotes.from_dict(patch_note)
    patch_note = patch_note_obj.to_dict()
    return Response(json_util.dumps(patch_note), mimetype='application/json',
                    status=200)


def delete_patchnote(patch_id):  # noqa: E501
    """Deletes one patch note

     # noqa: E501

    :param patch_id: ID of the patch note
    :type patch_id: str
    :type patch_id: str

    :rtype: Union[None, Tuple[None, int], Tuple[None, int, Dict[str, str]]
    """
    deleted_doc = collection.delete_one({'patchID': patch_id})
    if deleted_doc.deleted_count == 0:
        raise ProblemException(
            title="Not found",
            detail="No document has been deleted",
            status=404,
        )
    return Response(
        "Document was deleted",
        mimetype='application/json',
        status=200,
    )


def get_patchnote(patch_id):  # noqa: E501
    """Returns one patch note

     # noqa: E501

    :param patch_id: ID of the patch note
    :type patch_id: str
    :type patch_id: str

    :rtype: Union[PatchNotes, Tuple[PatchNotes, int], Tuple[PatchNotes, int, Dict[str, str]]
    """
    pn = collection.find_one({'patchID': patch_id})
    if pn is None:
        raise ProblemException(
            title="Not found",
            detail="No document has been found",
            status=404,
        )
    return Response(
        json_util.dumps(pn),
        mimetype='application/json',
        status=200,
    )


def list_patchnotes(since: str | None = None):
    # 1) validate query param only if present
    if since:
        try:
            datetime.strptime(since, "%Y-%m-%d")
        except ValueError:
            raise ProblemException(
                title="Bad Request",
                detail="The date is invalid. Needs to be in this format YYYY-MM-DD",
                status=400,
            )
        query = {"patch_date": {"$gte": since}}
    else:
        query = {}                       # no filter  -> all notes

    # 2) fetch from Mongo
    docs = list(collection.find(query).sort("patch_date", 1))

    # 3) ensure every patch_date is *string* before serialising
    for d in docs:
        if isinstance(d.get("patch_date"), (datetime, date)):
            d["patch_date"] = d["patch_date"].strftime("%Y-%m-%d")
        d.pop("_id", None)               # optional: hide Mongo’s internal id

    # 4) serialise – default=str handles any remaining non-JSON types
    return Response(
        json_util.dumps(docs, default=str),
        mimetype="application/json",
        status=200,
    )


def update_patchnote(patch_id, body):  # noqa: E501
    """Updates one patch note (full replace)

     # noqa: E501

    :param body:
    :param patch_id: ID of the patch note
    :type patch_id: str
    :type patch_id: str
    :param patch_notes_input: 
    :type patch_notes_input: dict | bytes

    :rtype: Union[PatchNotes, Tuple[PatchNotes, int], Tuple[PatchNotes, int, Dict[str, str]]
    """
    pn = PatchNotes.from_dict(body)
    try:
        date_obj = datetime.strptime(pn.patch_date, '%Y-%m-%d').date()
        date_str = date_obj.strftime('%Y-%m-%d')
    except ValueError as e:
        raise ProblemException(
            title="Bad Request",
            detail="The date is invalid. Needs to be in this Format YYYY-MM-DD",
            status=400,
        )
    query_filter = {'patchID': patch_id}
    updated_post = {'$set':
        {
            'title': pn.title,
            'changes': pn.changes,
            'version': pn.version,
            'date': date_str
        }
    }
    result = collection.update_one(query_filter, updated_post)
    if result.modified_count == 0:
        raise ProblemException(
            title="Not found",
            detail="No document has been deleted",
            status=404,
        )
    return Response("Document was updated", status=200, mimetype='application/json')