# GUI Application automation and testing library
# Copyright (C) 2006-2018 Mark Mc Mahon and Contributors
# https://github.com/pywinauto/pywinauto/graphs/contributors
# http://pywinauto.readthedocs.io/en/latest/credits.html
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"""Implementation of the class to deal with an UI element (based on UI Automation API)"""

from comtypes import COMError
from six import integer_types, text_type
from ctypes.wintypes import tagPOINT

from .uia_defines import IUIA
from .uia_defines import get_elem_interface

from .handleprops import dumpwindow, controlid
from .element_info import ElementInfo
from .win32structures import RECT
from .actionlogger import ActionLogger


def elements_from_uia_array(ptrs, cache_enable=False):
    """Build a list of UIAElementInfo elements from IUIAutomationElementArray"""
    elements = []
    for n in range(ptrs.Length):
        try:
            elements.append(UIAElementInfo(ptrs.GetElement(n), cache_enable))
        except COMError:
            continue
    return elements


class UIAElementInfo(ElementInfo):
    """UI element wrapper for IUIAutomation API"""

    def __init__(self, handle_or_elem=None, cache_enable=False):
        """
        Create an instance of UIAElementInfo from a handle (int or long)
        or from an IUIAutomationElement.

        If handle_or_elem is None create an instance for UI root element.
        """
        if handle_or_elem is not None:
            if isinstance(handle_or_elem, integer_types):
                # Create instane of UIAElementInfo from a handle
                self._element = IUIA().iuia.ElementFromHandle(handle_or_elem)
            elif isinstance(handle_or_elem, IUIA().ui_automation_client.IUIAutomationElement):
                self._element = handle_or_elem
            else:
                raise TypeError("UIAElementInfo object can be initialized " + \
                                "with integer or IUIAutomationElement instance only!")
        else:
            self._element = IUIA().root

        self.set_cache_strategy(cached=cache_enable)

    def _get_current_class_name(self):
        """Return an actual class name of the element"""
        try:
            cn = self._element.CurrentClassName
            return text_type('') if cn is None else cn
        except COMError:
            return text_type('')  # probably element already doesn't exist

    def _get_cached_class_name(self):
        """Return a cached class name of the element"""
        if self._cached_class_name is None:
            self._cached_class_name = self._get_current_class_name()
        return self._cached_class_name

    def _get_current_handle(self):
        """Return an actual handle of the element"""
        try:
            return self._element.CurrentNativeWindowHandle
        except COMError:
            return None  # probably element already doesn't exist

    def _get_cached_handle(self):
        """Return a cached handle of the element"""
        if self._cached_handle is None:
            self._cached_handle = self._get_current_handle()
        return self._cached_handle

    def _get_current_control_type(self):
        """Return an actual control type of the element"""
        try:
            return IUIA().known_control_type_ids[self._element.CurrentControlType]
        except COMError:
            return None  # probably element already doesn't exist

    def _get_cached_control_type(self):
        """Return a cached control type of the element"""
        if self._cached_control_type is None:
            self._cached_control_type = self._get_current_control_type()
        return self._cached_control_type

    def _get_current_name(self):
        """Return an actual name of the element"""
        try:
            n = self._element.CurrentName
            return text_type('') if n is None else n
        except COMError:
            return text_type('')  # probably element already doesn't exist

    def _get_cached_name(self):
        """Return a cached name of the element"""
        if self._cached_name is None:
            self._cached_name = self._get_current_name()
        return self._cached_name

    def _get_current_visible(self):
        """Return an actual visible property of the element"""
        try:
            return bool(not self._element.CurrentIsOffscreen)
        except COMError:
            return False  # probably element already doesn't exist

    def _get_cached_visible(self):
        """Return a cached visible property of the element"""
        if self._cached_visible is None:
            self._cached_visible = self._get_current_visible()
        return self._cached_visible

    def _get_current_rich_text(self):
        """Return the actual rich_text of the element"""
        if not self.class_name:
            return self.name
        try:
            pattern = get_elem_interface(self._element, "Text")
            return pattern.DocumentRange.GetText(-1)
        except Exception:
            return self.name  # TODO: probably we should raise an exception here

    def _get_cached_rich_text(self):
        """Return the cached rich_text of the element"""
        if self._cached_rich_text is None:
            self._cached_rich_text = self._get_current_rich_text()
        return self._cached_rich_text

    def set_cache_strategy(self, cached=None):
        """Setup a cache strategy for frequently used attributes"""
        if cached is True:
            # Refresh cached attributes
            self._cached_class_name = None
            self._cached_handle = None
            self._cached_control_type = None
            self._cached_name = None
            self._cached_visible = None
            self._cached_rich_text = None

            # Switch to cached attributes
            self._get_class_name = self._get_cached_class_name
            self._get_handle = self._get_cached_handle
            self._get_control_type = self._get_cached_control_type
            self._get_name = self._get_cached_name
            self._get_visible = self._get_cached_visible
            self._get_rich_text = self._get_cached_rich_text
        else:
            # Switch to actual (non-cached) attributes
            self._get_class_name = self._get_current_class_name
            self._get_handle = self._get_current_handle
            self._get_control_type = self._get_current_control_type
            self._get_name = self._get_current_name
            self._get_visible = self._get_current_visible
            self._get_rich_text = self._get_current_rich_text

    @property
    def element(self):
        """Return AutomationElement's instance"""
        return self._element

    @property
    def automation_id(self):
        """Return AutomationId of the element"""
        try:
            return self._element.CurrentAutomationId
        except COMError:
            return None  # probably element already doesn't exist

    @property
    def control_id(self):
        """Return ControlId of the element if it has a handle"""
        if (self.handle):
            return controlid(self.handle)
        else:
            return None

    @property
    def process_id(self):
        """Return ProcessId of the element"""
        try:
            return self._element.CurrentProcessId
        except COMError:
            return None  # probably element already doesn't exist

    @property
    def framework_id(self):
        """Return FrameworkId of the element"""
        try:
            return self._element.CurrentFrameworkId
        except COMError:
            return None  # probably element already doesn't exist

    @property
    def runtime_id(self):
        """Return Runtime ID (hashable value but may be different from run to run)"""
        try:
            return self._element.GetRuntimeId()
        except COMError:
            return 0

    @property
    def name(self):
        """Return name of the element"""
        return self._get_name()

    @property
    def class_name(self):
        """Return class name of the element"""
        return self._get_class_name()

    @property
    def control_type(self):
        """Return control type of element"""
        return self._get_control_type()

    @property
    def handle(self):
        """Return handle of the element"""
        return self._get_handle()

    @property
    def parent(self):
        """Return parent of the element"""
        parent_elem = IUIA().iuia.ControlViewWalker.GetParentElement(self._element)
        if parent_elem:
            return UIAElementInfo(parent_elem)
        else:
            return None

    def _get_elements(self, tree_scope, cond=IUIA().true_condition, cache_enable=False):
        """Find all elements according to the given tree scope and conditions"""
        try:
            ptrs_array = self._element.FindAll(tree_scope, cond)
            return elements_from_uia_array(ptrs_array, cache_enable)
        except(COMError, ValueError):
            ActionLogger().log("COM error: can't get elements")
            return []

    def children(self, **kwargs):
        """Return a list of only immediate children of the element

         * **kwargs** is a criteria to reduce a list by process,
           class_name, control_type, content_only and/or title.
        """
        cache_enable = kwargs.pop('cache_enable', False)
        cond = IUIA().build_condition(**kwargs)
        return self._get_elements(IUIA().tree_scope["children"], cond, cache_enable)

    def iter_children(self, **kwargs):
        """Return a generator of only immediate children of the element

         * **kwargs** is a criteria to reduce a list by process,
           class_name, control_type, content_only and/or title.
        """
        cond = IUIA().build_condition(**kwargs)
        tree_walker = IUIA().iuia.CreateTreeWalker(cond)
        element = tree_walker.GetFirstChildElement(self._element)
        while element:
            yield UIAElementInfo(element)
            element = tree_walker.GetNextSiblingElement(element)

    def descendants(self, **kwargs):
        """Return a list of all descendant children of the element

         * **kwargs** is a criteria to reduce a list by process,
           class_name, control_type, content_only and/or title.
        """
        cache_enable = kwargs.pop('cache_enable', False)
        depth = kwargs.pop('depth', None)
        cond = IUIA().build_condition(**kwargs)
        elements = self._get_elements(IUIA().tree_scope["descendants"], cond, cache_enable)

        elements = ElementInfo.filter_with_depth(elements, self, depth)

        return elements

    @property
    def visible(self):
        """Check if the element is visible"""
        return self._get_visible()

    @property
    def enabled(self):
        """Check if the element is enabled"""
        return bool(self._element.CurrentIsEnabled)

    @property
    def rectangle(self):
        """Return rectangle of the element"""
        bound_rect = self._element.CurrentBoundingRectangle
        rect = RECT()
        rect.left = bound_rect.left
        rect.top = bound_rect.top
        rect.right = bound_rect.right
        rect.bottom = bound_rect.bottom
        return rect

    def dump_window(self):
        """Dump window to a set of properties"""
        return dumpwindow(self.handle)

    @classmethod
    def from_point(cls, x, y):
        return cls(IUIA().iuia.ElementFromPoint(tagPOINT(x, y)))

    @classmethod
    def top_from_point(cls, x, y):
        current_elem = cls.from_point(x, y)
        current_parent = current_elem.parent
        while current_parent is not None and current_parent != cls():
            current_elem = current_parent
            current_parent = current_elem.parent
        return current_elem

    @property
    def rich_text(self):
        """Return rich_text of the element"""
        return self._get_rich_text()

    def __eq__(self, other):
        """Check if 2 UIAElementInfo objects describe 1 actual element"""
        if not isinstance(other, UIAElementInfo):
            return False
        return bool(IUIA().iuia.CompareElements(self.element, other.element))

    def __ne__(self, other):
        """Check if 2 UIAElementInfo objects describe 2 different elements"""
        return not (self == other)