import appdirs
import os
from configparser import ConfigParser
import csv
from typing import Iterable

from properties import config
from model import RecentProject

class AppDataStorage(object):

    SETTINGS_FILE = "config.ini"
    RECENT_PROJECTS_FILE = "recent.cfg"

    def __init__(self):
        self.__appDataPath = appdirs.user_data_dir(config.APP_NAME, config.APP_AUTHOR_SHORT, config.APP_VERSION)
        self.__settingsPath = os.path.join(self.__appDataPath, AppDataStorage.SETTINGS_FILE)
        self.__recentProjectsPath = os.path.join(self.__appDataPath, AppDataStorage.RECENT_PROJECTS_FILE)

    # make missing dirs in path
    def __createPath(self, path):
        dir = os.path.dirname(path)
        os.makedirs(dir, exist_ok=True)

    def readSettings(self):
        if (os.path.exists(self.__settingsPath)):
            parser = ConfigParser()
            parser.read(self.__settingsPath)
            # todo: finish this

    def writeSettings(self, settings):
        pass # todo: finish this

    """
    Reads recent projects list.

    Returns:
        list of recent projects
    """
    def readRecentProjects(self) -> Iterable[RecentProject]:
        if (os.path.exists(self.__recentProjectsPath)):
            with open(self.__recentProjectsPath, 'r') as recentProjectsFile:
                csvreader = csv.DictReader(recentProjectsFile, fieldnames=RecentProject.DICT_FIELDS)
                for row in csvreader:
                    try:
                        yield RecentProject.fromDictionary(row)
                    except ValueError:
                        print("Recent projects parse error - invalid date.", row)
                    except KeyError:
                        print("Recent projects parse error - fields not valid.", row)

    """
    Writes a list of recent projects.
    
    Args:
        items: list of RecentProjects
    """
    def writeRecentProjects(self, items : Iterable[RecentProject]) -> None:
        self.__createPath(self.__recentProjectsPath)
        with open(self.__recentProjectsPath, 'w') as recentProjectsFile:
            csvwriter = csv.DictWriter(recentProjectsFile, RecentProject.DICT_FIELDS)
            for item in items:
                csvwriter.writerow(item.toDictionary())