import json
import os
import pathlib

import requests

from bulkredditdownloader.downloaders.Direct import Direct
from bulkredditdownloader.downloaders.downloaderUtils import getFile
from bulkredditdownloader.errors import (AlbumNotDownloadedCompletely, ExtensionError, FileAlreadyExistsError, ImageNotFound,
                                         NotADownloadableLinkError, TypeInSkip)
from bulkredditdownloader.utils import GLOBAL, nameCorrector
from bulkredditdownloader.utils import printToFile as print


class Imgur:

    imgur_image_domain = "https://i.imgur.com/"

    def __init__(self, directory: pathlib.Path, post: dict):
        link = post['CONTENTURL']

        if link.endswith(".gifv"):
            link = link.replace(".gifv", ".mp4")
            Direct(directory, {**post, 'CONTENTURL': link})
            return

        self.raw_data = self.getData(link)

        self.directory = directory
        self.post = post

        if self.isAlbum:
            if self.raw_data["album_images"]["count"] != 1:
                self.downloadAlbum(self.raw_data["album_images"])
            else:
                self.download(self.raw_data["album_images"]["images"][0])
        else:
            self.download(self.raw_data)

    def downloadAlbum(self, images: dict):
        folder_name = GLOBAL.config['filename'].format(**self.post)
        folder_dir = self.directory / folder_name

        images_length = images["count"]
        how_many_downloaded = 0
        duplicates = 0

        try:
            if not os.path.exists(folder_dir):
                os.makedirs(folder_dir)
        except FileNotFoundError:
            folder_dir = self.directory / self.post['POSTID']
            os.makedirs(folder_dir)

        print(folder_name)

        for i in range(images_length):
            extension = self.validateExtension(images["images"][i]["ext"])
            image_url = self.imgur_image_domain + images["images"][i]["hash"] + extension
            filename = "_".join([str(i + 1),
                                 nameCorrector(images["images"][i]['title']),
                                 images["images"][i]['hash']]) + extension
            short_filename = str(i + 1) + "_" + images["images"][i]['hash']

            print("\n  ({}/{})".format(i + 1, images_length))

            try:
                getFile(filename, short_filename, folder_dir, image_url, indent=2)
                how_many_downloaded += 1
                print()

            except FileAlreadyExistsError:
                print("  The file already exists" + " " * 10, end="\n\n")
                duplicates += 1

            except TypeInSkip:
                print("  Skipping...")
                how_many_downloaded += 1

            except Exception as exception:
                print("\n  Could not get the file")
                print(
                    "  " +
                    "{class_name}: {info}\nSee CONSOLE_LOG.txt for more information".format(
                        class_name=exception.__class__.__name__,
                        info=str(exception)
                    )
                    + "\n"
                )
                print(GLOBAL.log_stream.getvalue(), no_print=True)

        if duplicates == images_length:
            raise FileAlreadyExistsError
        elif how_many_downloaded + duplicates < images_length:
            raise AlbumNotDownloadedCompletely("Album Not Downloaded Completely")

    def download(self, image: dict):
        extension = self.validateExtension(image["ext"])
        image_url = self.imgur_image_domain + image["hash"] + extension

        filename = GLOBAL.config['filename'].format(**self.post) + extension
        short_filename = self.post['POSTID'] + extension

        getFile(filename, short_filename, self.directory, image_url)

    @property
    def isAlbum(self) -> bool:
        return "album_images" in self.raw_data

    @staticmethod
    def getData(link: str) -> dict:
        cookies = {"over18": "1", "postpagebeta": "0"}
        res = requests.get(link, cookies=cookies)
        if res.status_code != 200:
            raise ImageNotFound(f"Server responded with {res.status_code} to {link}")
        page_source = requests.get(link, cookies=cookies).text

        starting_string = "image               : "
        ending_string = "group               :"

        starting_string_lenght = len(starting_string)
        try:
            start_index = page_source.index(starting_string) + starting_string_lenght
            end_index = page_source.index(ending_string, start_index)
        except ValueError:
            raise NotADownloadableLinkError(
                f"Could not read the page source on {link}")

        while page_source[end_index] != "}":
            end_index -= 1
        try:
            data = page_source[start_index:end_index + 2].strip()[:-1]
        except Exception:
            page_source[end_index + 1] = '}'
            data = page_source[start_index:end_index + 3].strip()[:-1]

        return json.loads(data)

    @staticmethod
    def validateExtension(string: str) -> str:
        possible_extensions = [".jpg", ".png", ".mp4", ".gif"]

        for extension in possible_extensions:
            if extension in string:
                return extension
        else:
            raise ExtensionError(f"\"{string}\" is not recognized as a valid extension.")