#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""Target module."""

import asyncio
from typing import Any, Callable, Coroutine, Dict, List, Optional
from typing import TYPE_CHECKING

from pyppeteer.connection import CDPSession
from pyppeteer.page import Page

if TYPE_CHECKING:
    from pyppeteer.browser import Browser, BrowserContext  # noqa: F401


class Target(object):
    """Browser's target class."""

    def __init__(self, targetInfo: Dict, browserContext: 'BrowserContext',
                 sessionFactory: Callable[[], Coroutine[Any, Any, CDPSession]],
                 ignoreHTTPSErrors: bool, defaultViewport: Optional[Dict],
                 screenshotTaskQueue: List, loop: asyncio.AbstractEventLoop
                 ) -> None:
        self._targetInfo = targetInfo
        self._browserContext = browserContext
        self._targetId = targetInfo.get('targetId', '')
        self._sessionFactory = sessionFactory
        self._ignoreHTTPSErrors = ignoreHTTPSErrors
        self._defaultViewport = defaultViewport
        self._screenshotTaskQueue = screenshotTaskQueue
        self._loop = loop
        self._page: Optional[Page] = None

        self._initializedPromise = self._loop.create_future()
        self._isClosedPromise = self._loop.create_future()
        self._isInitialized = (self._targetInfo['type'] != 'page'
                               or self._targetInfo['url'] != '')
        if self._isInitialized:
            self._initializedCallback(True)

    def _initializedCallback(self, bl: bool) -> None:
        # TODO: this may cause error on page close
        if self._initializedPromise.done():
            self._initializedPromise = self._loop.create_future()
        self._initializedPromise.set_result(bl)

    def _closedCallback(self) -> None:
        self._isClosedPromise.set_result(None)

    async def createCDPSession(self) -> CDPSession:
        """Create a Chrome Devtools Protocol session attached to the target."""
        return await self._sessionFactory()

    async def page(self) -> Optional[Page]:
        """Get page of this target.

        If the target is not of type "page" or "background_page", return
        ``None``.
        """
        if (self._targetInfo['type'] in ['page', 'background_page'] and
                self._page is None):
            client = await self._sessionFactory()
            new_page = await Page.create(
                client, self,
                self._ignoreHTTPSErrors,
                self._defaultViewport,
                self._screenshotTaskQueue,
            )
            self._page = new_page
            return new_page
        return self._page

    @property
    def url(self) -> str:
        """Get url of this target."""
        return self._targetInfo['url']

    @property
    def type(self) -> str:
        """Get type of this target.

        Type can be ``'page'``, ``'background_page'``, ``'service_worker'``,
        ``'browser'``, or ``'other'``.
        """
        _type = self._targetInfo['type']
        if _type in ['page', 'background_page', 'service_worker', 'browser']:
            return _type
        return 'other'

    @property
    def browser(self) -> 'Browser':
        """Get the browser the target belongs to."""
        return self._browserContext.browser

    @property
    def browserContext(self) -> 'BrowserContext':
        """Return the browser context the target belongs to."""
        return self._browserContext

    @property
    def opener(self) -> Optional['Target']:
        """Get the target that opened this target.

        Top-level targets return ``None``.
        """
        openerId = self._targetInfo.get('openerId')
        if openerId is None:
            return None
        return self.browser._targets.get(openerId)

    def _targetInfoChanged(self, targetInfo: Dict) -> None:
        self._targetInfo = targetInfo

        if not self._isInitialized and (self._targetInfo['type'] != 'page' or
                                        self._targetInfo['url'] != ''):
            self._isInitialized = True
            self._initializedCallback(True)
            return