import os
from glob import glob

import settings
from db import db
from sync.image import sync_image
from utils.fn import lmap, lprint, key_mapper, lprint_json, ext
from utils.hash import hash_str, hash_file
from utils.image import create_image
from utils.io import read_yaml_md
from utils.text.transform import url_encode_text

dir_teachers = '/Users/tmshv/Dropbox/Dev/Hud school/Collective'
url_base = settings.teacher_image_url_base
dir_local_images = settings.teacher_image_output
sizes = settings.teacher_image_sizes

class Teacher:
    def collection(self):
        return db().collective

    def read_teacher_by_id(self, record):
        if isinstance(record, list):
            return lmap(
                self.read_teacher_by_id,
                record
            )

        q = {'id': record}
        try:
            return db().collective.find_one(q)
        except ValueError:
            pass

        return None

    def sync_collective(self, record):
        if isinstance(record, list):
            return lmap(
                self.sync_collective,
                record
            )

        q = {'id': record['id']}
        try:
            collection = db().collective
            update_result = collection.update_one(q, {'$set': record}, upsert=True)
            i = collection.find_one({'id': record['id']})
            return i
        except ValueError:
            pass

        return None

    def compile(self, profile):
        profile['picture'] = create_image(
            profile['picture'],
            sizes,
            lambda size, ext: url_base.format(id=profile['id'], size=size, ext=ext),
            dir_local_images
        )
        return profile

    def read_document(self, i, query_fn=None):
        q = query_fn(i) if query_fn else {'id': i['id']}
        try:
            return self.collection().find_one(q)
        except ValueError:
            pass

        return None

    def query_documents(self, q):
        return self.collection().find(q)

    def delete_document(self, q):
        return self.collection().find_one_and_delete(q)

    def create_id(self, document):
        if 'id' in document and document['id']:
            return document['id']

        document['id'] = url_encode_text(document['name'])


if __name__ == '__main__':
    # ALL DOCUMENTS IDS FOUNDED
    scope_documents_ids = []

    os.chdir(dir_teachers)
    sync = Teacher()

    # GET TEACHER YAML/MD MANIFEST FILES
    documents = glob('*.md')

    # # READ TEACHER YAML/MD MANIFEST
    documents = lmap(
        lambda i: (i,) + read_yaml_md(i),
        documents
    )

    # COMBINE MD DATA WITH YAML MANIFEST AS BIOGRAPHY
    documents = lmap(
        lambda i: {
            **i[1],
            'file': i[0],
            'biography': i[2]
        },
        documents
    )

    # DEFINE PROFILE PICTURE
    documents = lmap(
        lambda i: {
            **i,
            'picture': i['picture'] if 'picture' in i else ext('.jpg')(i['file']),
        },
        documents
    )

    # CREATE DOCUMENT IDENTITY
    documents = lmap(
        lambda i: {**i, 'id': sync.create_id(i)},
        documents
    )

    # CREATE HASH OF DOCUMENT FILES
    documents = lmap(
        lambda i: {
            **i, 'hash': hash_str(
                hash_file(i['file']) + hash_file(i['picture'])
            )
        },
        documents
    )

    # CREATE SCOPE OF CURRENT SESSION
    scope_documents_ids = lmap(
        lambda i: i['id'],
        documents
    )

    # SKIP UNTOUCHED DOCUMENTS
    documents = lmap(
        lambda i: i[0],
        filter(
            lambda i: (i[1] is None) or ('hash' not in i[1]) or (i[0]['hash'] != i[1]['hash']),
            lmap(
                lambda document: (document, sync.read_document(document)),
                documents
            )
        ))

    # DO HEAVY PROCESS WITH DOCUMENTS
    documents = lmap(
        sync.compile,
        documents
    )

    # # REPLACE PICTURE_OBJECT WITH IT _ID IN MONGODB
    sync_picture = lambda i: None if i is None else sync_image(i)['_id']
    documents = lmap(
        key_mapper('picture', sync_picture),
        documents
    )

    # # SYNC TEACHER_PROFILE
    documents = lmap(
        sync.sync_collective,
        documents
    )

    documents_to_remove = sync.query_documents({'id': {'$nin': scope_documents_ids}})
    documents_to_remove = lmap(
        sync.delete_document,
        map(
            lambda i: {'_id': i['_id']},
            documents_to_remove
        )
    )

    # SCOPE
    print('SCOPE:')
    lprint(scope_documents_ids)

    # DELETE
    print('DELETE DOCUMENTS:')
    lprint_json(documents_to_remove)

    # DELETE
    print('UPDATE DOCUMENTS:')
    lprint_json(documents)
    print('[SYNC DOCUMENTS DONE]')