import os.path

from engine.log import debug


class FlatFileHandler:
    def __init__(self, filename, directory='config/', base='/etc/hometv/'):
        self.filename = filename
        self.directory = directory
        self.base = base

        self.attributes = {}
        self.cache = {}

        if os.path.exists(self.base + self.directory + self.filename):
            content = self.read_file()
            debug('Loading config')
            self.parse_config(content)

        else:
            self.create_file()

    def handle(self, mode='r'):
        return open(self.base + self.directory + self.filename, mode)

    def is_empty(self):
        return len(self.attributes) == 0

    def create_file(self):
        self.handle(mode='x').close()

    def write_to_file(self):
        file = self.handle('w+')

        for attribute in self.attributes:
            file.write(str(self.attributes[attribute]) + '\n')

    def read_file(self):
        file = self.handle()
        content = None
        if file.mode == 'r':
            content = file.readlines()
        file.close()
        return content

    def parse_config(self, lines):
        debug('Parse settings. {} lines'.format(len(lines)))
        for line in lines:
            content = line.split('=')
            debug('{}=>{}'.format(content[0], content[1].strip()))
            self.cache[content[0]] = content[1]

    def set_attribute(self, name, _type=str, value=None, default=None, raw=None):
        self.attributes[name] = self.Attribute(name, _type=_type, value=value, default=default, raw=(self.cache[name] if name in self.cache else raw))

    def remove_attribute(self, name):
        self.attributes.pop(name)

    def get(self, key):
        debug(key)
        return self.attributes[key].get()

    class Attribute:
        def __init__(self, name, _type=str, value=None, default=None, raw=None):
            self.name = name
            self.value = value
            self.default = default
            self.type = _type

            self.raw = raw

            if raw and not value:
                self.set_from_raw(self.raw)

        def __str__(self):
            output = self.get()
            if self.type is list:
                output = ','.join(str(x) for x in output)
            return '{}={}'.format(self.name, output)

        def parse(self):
            if self.type is str:
                self.value = str(self.raw)
            if self.type is bool:
                self.value = self.raw.upper() in ['TRUE', 'YES', 'Y', 'T', '1']
            if self.type is int:
                self.value = int(self.raw)
            if self.type is float:
                self.value = float(self.raw)
            if self.type is list:
                self.value = self.raw.split(',')
            if self.type is dict:
                self.value = {}
                attributes = self.raw.split(',')
                for attribute in attributes:
                    attr = attribute.split('>')
                    self.value[attr[0]] = attr[1]

        def set_from_raw(self, raw):
            self.raw = raw.strip()
            self.parse()

        def set(self, value):
            if type(value) is self.type:
                self.value = value
            else:
                raise TypeError('{} expected but {} given'.format(self.type.__name__, type(value).__name__))

        def get(self):
            debug('Get value: {}'.format(self.value))
            return self.value if self.value else self.default