""" PhotosDB method for processing exif info 
    Do not import this module directly """

import logging

from .._constants import _DB_TABLE_NAMES, _PHOTOS_4_VERSION
from ..sqlite_utils import sqlite_db_is_locked, sqlite_open_ro
from .photosdb_utils import get_db_version


def _process_exifinfo(self):
    """load the exif data from the database
    this is a PhotosDB method that should be imported in
    the PhotosDB class definition in photosdb.py
    """
    if self._db_version <= _PHOTOS_4_VERSION:
        _process_exifinfo_4(self)
    else:
        _process_exifinfo_5(self)


# The following methods do not get imported into PhotosDB
# but will get called by _process_exifinfo


def _process_exifinfo_4(photosdb):
    """process exif info for Photos <= 4
    photosdb: PhotosDB instance"""
    photosdb._db_exifinfo_uuid = {}
    raise NotImplementedError(f"search info not implemented for this database version")


def _process_exifinfo_5(photosdb):
    """process exif info for Photos >= 5
    photosdb: PhotosDB instance"""

    db = photosdb._tmp_db

    asset_table = _DB_TABLE_NAMES[photosdb._photos_ver]["ASSET"]

    (conn, cursor) = sqlite_open_ro(db)

    result = conn.execute(
        f"""
        SELECT {asset_table}.ZUUID, ZEXTENDEDATTRIBUTES.*
        FROM {asset_table}
        JOIN ZEXTENDEDATTRIBUTES
        ON ZEXTENDEDATTRIBUTES.ZASSET = {asset_table}.Z_PK
        """
    )

    photosdb._db_exifinfo_uuid = {}
    cols = [c[0] for c in result.description]
    for row in result.fetchall():
        record = dict(zip(cols, row))
        uuid = record["ZUUID"]
        if uuid in photosdb._db_exifinfo_uuid:
            logging.warning(f"duplicate exifinfo record found for uuid {uuid}")
        photosdb._db_exifinfo_uuid[uuid] = record

    conn.close()
