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# to you under the Apache License, Version 2.0 (the
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#   http://www.apache.org/licenses/LICENSE-2.0
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from typing import Dict
from typing import List
from typing import NoReturn
from typing import Optional
from typing import Union
from typing import overload

from selenium.common.exceptions import WebDriverException
from selenium.webdriver.common.by import By
from selenium.webdriver.common.by import ByType
from selenium.webdriver.remote.webelement import WebElement


def with_tag_name(tag_name: str) -> "RelativeBy":
    """Start searching for relative objects using a tag name.

    Note: This method may be removed in future versions, please use
    `locate_with` instead.
    :Args:
        - tag_name: the DOM tag of element to start searching.
    :Returns:
        - RelativeBy - use this object to create filters within a
            `find_elements` call.
    """
    if not tag_name:
        raise WebDriverException("tag_name can not be null")
    return RelativeBy({By.CSS_SELECTOR: tag_name})


def locate_with(by: ByType, using: str) -> "RelativeBy":
    """Start searching for relative objects your search criteria with By.

    :Args:
        - by: The value from `By` passed in.
        - using: search term to find the element with.
    :Returns:
        - RelativeBy - use this object to create filters within a
            `find_elements` call.
    """
    assert by is not None, "Please pass in a by argument"
    assert using is not None, "Please pass in a using argument"
    return RelativeBy({by: using})


class RelativeBy:
    """Gives the opportunity to find elements based on their relative location
    on the page from a root elelemt. It is recommended that you use the helper
    function to create it.

    Example:
        lowest = driver.find_element(By.ID, "below")

        elements = driver.find_elements(locate_with(By.CSS_SELECTOR, "p").above(lowest))

        ids = [el.get_attribute('id') for el in elements]
        assert "above" in ids
        assert "mid" in ids
    """

    LocatorType = Dict[ByType, str]

    def __init__(self, root: Optional[Dict[ByType, str]] = None, filters: Optional[List] = None):
        """Creates a new RelativeBy object. It is preferred if you use the
        `locate_with` method as this signature could change.

        :Args:
            root - A dict with `By` enum as the key and the search query as the value
            filters - A list of the filters that will be searched. If none are passed
                in please use the fluent API on the object to create the filters
        """
        self.root = root
        self.filters = filters or []

    @overload
    def above(self, element_or_locator: Union[WebElement, LocatorType]) -> "RelativeBy": ...

    @overload
    def above(self, element_or_locator: None = None) -> "NoReturn": ...

    def above(self, element_or_locator: Union[WebElement, LocatorType, None] = None) -> "RelativeBy":
        """Add a filter to look for elements above.

        :Args:
            - element_or_locator: Element to look above
        """
        if not element_or_locator:
            raise WebDriverException("Element or locator must be given when calling above method")

        self.filters.append({"kind": "above", "args": [element_or_locator]})
        return self

    @overload
    def below(self, element_or_locator: Union[WebElement, LocatorType]) -> "RelativeBy": ...

    @overload
    def below(self, element_or_locator: None = None) -> "NoReturn": ...

    def below(self, element_or_locator: Union[WebElement, Dict, None] = None) -> "RelativeBy":
        """Add a filter to look for elements below.

        :Args:
            - element_or_locator: Element to look below
        """
        if not element_or_locator:
            raise WebDriverException("Element or locator must be given when calling below method")

        self.filters.append({"kind": "below", "args": [element_or_locator]})
        return self

    @overload
    def to_left_of(self, element_or_locator: Union[WebElement, LocatorType]) -> "RelativeBy": ...

    @overload
    def to_left_of(self, element_or_locator: None = None) -> "NoReturn": ...

    def to_left_of(self, element_or_locator: Union[WebElement, Dict, None] = None) -> "RelativeBy":
        """Add a filter to look for elements to the left of.

        :Args:
            - element_or_locator: Element to look to the left of
        """
        if not element_or_locator:
            raise WebDriverException("Element or locator must be given when calling to_left_of method")

        self.filters.append({"kind": "left", "args": [element_or_locator]})
        return self

    @overload
    def to_right_of(self, element_or_locator: Union[WebElement, LocatorType]) -> "RelativeBy": ...

    @overload
    def to_right_of(self, element_or_locator: None = None) -> "NoReturn": ...

    def to_right_of(self, element_or_locator: Union[WebElement, Dict, None] = None) -> "RelativeBy":
        """Add a filter to look for elements right of.

        :Args:
            - element_or_locator: Element to look right of
        """
        if not element_or_locator:
            raise WebDriverException("Element or locator must be given when calling to_right_of method")

        self.filters.append({"kind": "right", "args": [element_or_locator]})
        return self

    @overload
    def near(self, element_or_locator: Union[WebElement, LocatorType], distance: int = 50) -> "RelativeBy": ...

    @overload
    def near(self, element_or_locator: None = None, distance: int = 50) -> "NoReturn": ...

    def near(self, element_or_locator: Union[WebElement, LocatorType, None] = None, distance: int = 50) -> "RelativeBy":
        """Add a filter to look for elements near.

        :Args:
            - element_or_locator: Element to look near by the element or within a distance
            - distance: distance in pixel
        """
        if not element_or_locator:
            raise WebDriverException("Element or locator must be given when calling near method")
        if distance <= 0:
            raise WebDriverException("Distance must be positive")

        self.filters.append({"kind": "near", "args": [element_or_locator, distance]})
        return self

    def to_dict(self) -> Dict:
        """Create a dict that will be passed to the driver to start searching
        for the element."""
        return {
            "relative": {
                "root": self.root,
                "filters": self.filters,
            }
        }
