import importlib
import bumblebee.theme
import bumblebee.output
import bumblebee.config
import bumblebee.modules

class Engine:
    def __init__(self, config):
        self._modules = []
        self._config = config
        self._theme = bumblebee.theme.Theme(config)
        self._output = bumblebee.output.output(config)

    def load_module(self, modulespec):
        name = modulespec["name"]
        module = importlib.import_module("bumblebee.modules.{}".format(name))
        cfg = bumblebee.config.ModuleConfig(self._config, name, modulespec["alias"])
        obj = getattr(module, "Module")(self._output, cfg)
        obj.register_callbacks()
        return obj

    def load_modules(self):
        for m in self._config.modules():
            self._modules.append(self.load_module(m))

    def run(self):
        self._output.start()

        while True:
            self._theme.begin()
            for m in self._modules:
                self._output.draw(m.widgets(), self._theme)
            self._output.flush()
            self._output.wait()

        self._output.stop()

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