import os
from typing import Literal

from qgis.core import QgsApplication, QgsAuthMethodConfig
from qgis.PyQt import QtWidgets, uic

from eodh_qgis.settings import Settings

# This loads your .ui file so that PyQt can populate your plugin with the elements from
# Qt Designer
FORM_CLASS, _ = uic.loadUiType(os.path.join(os.path.dirname(__file__), "../ui/settings.ui"))


class SettingsWidget(QtWidgets.QWidget, FORM_CLASS):
    def __init__(self, parent=None):
        """Constructor."""
        super().__init__(parent)
        self.setupUi(self)

        self.username_input: QtWidgets.QLineEdit
        self.token_input: QtWidgets.QLineEdit
        self.env_select: QtWidgets.QComboBox
        self.settings = Settings()

        assert parent is not None
        self.creds = parent.get_creds() or {}
        if self.creds:
            self.username_input.setText(self.creds.get("username", ""))
            self.token_input.setText(self.creds.get("token", ""))

        self.username_input.editingFinished.connect(lambda: self.save_creds("username"))
        self.token_input.editingFinished.connect(lambda: self.save_creds("token"))

        self.env_select.setCurrentText(self.settings.data["env"])
        self.env_select.currentTextChanged.connect(self.save_env)

    def save_env(self):
        self.settings.save("env", self.env_select.currentText())
        self.reload_ui()

    def save_creds(self, key: Literal["username", "token"]):
        username = self.username_input.text()
        token = self.token_input.text()
        value = username if key == "username" else token
        if self.creds.get(key) == value:
            return

        if not value:
            return

        self.creds[key] = value

        cfg = QgsAuthMethodConfig("Basic")
        auth_config_id = self.settings.data["auth_config"]
        auth_mgr = QgsApplication.authManager()

        if not auth_config_id:
            cfg.setName("eodh_plugin")
            cfg.setConfigMap(self.creds)
            (res, cfg) = auth_mgr.storeAuthenticationConfig(cfg, True)
            if res:
                self.settings.save("auth_config", cfg.id())
                self.reload_ui()
            return

        (res, cfg) = auth_mgr.loadAuthenticationConfig(auth_config_id, cfg, True)
        if res:
            cfg.setConfigMap(self.creds)
            (res, cfg) = auth_mgr.storeAuthenticationConfig(cfg, True)
            if res:
                self.settings.save("auth_config", cfg.id())
                self.reload_ui()
        else:
            cfg.setName("eodh_plugin")
            cfg.setConfigMap(self.creds)
            (res, cfg) = auth_mgr.storeAuthenticationConfig(cfg, True)
            if res:
                self.settings.save("auth_config", cfg.id())
                self.reload_ui()

    def get_main_dialog(self):
        # Navigate up the parent hierarchy to find the main dialog
        parent = self.parent()
        while parent:
            if hasattr(parent, "setup_ui_after_token"):
                return parent
            parent = parent.parent()
        return None

    def reload_ui(self):
        if not self.creds.get("username") or not self.creds.get("token"):
            return
        main_dialog = self.get_main_dialog()
        if main_dialog:
            main_dialog.setup_ui_after_token()
