import json
import os
import urllib

import requests
import pathlib

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


class Gallery:
    def __init__(self, directory: pathlib.Path, post):
        link = post['CONTENTURL']
        self.raw_data = self.getData(link)

        self.directory = directory
        self.post = post

        images = {}
        count = 0
        for model in self.raw_data['posts']['models']:
            try:
                for item in self.raw_data['posts']['models'][model]['media']['gallery']['items']:
                    try:
                        images[count] = {'id': item['mediaId'], 'url': self.raw_data['posts']
                                         ['models'][model]['media']['mediaMetadata'][item['mediaId']]['s']['u']}
                        count += 1
                    except Exception:
                        continue
            except Exception:
                continue

        self.downloadAlbum(images, count)

    @staticmethod
    def getData(link: str) -> dict:
        headers = {
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36 OPR/54.0.2952.64",
            "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
        }
        res = requests.get(link, headers=headers)
        if res.status_code != 200:
            raise ImageNotFound(f"Server responded with {res.status_code} to {link}")
        page_source = res.text

        starting_string = "_r = {"
        ending_string = "</script>"

        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}")

        data = json.loads(page_source[start_index - 1:end_index + 1].strip()[:-1])
        return data

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

        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(count):
            path = urllib.parse.urlparse(images[i]['url']).path
            extension = os.path.splitext(path)[1]

            filename = "_".join([str(i + 1), images[i]['id']]) + extension
            short_filename = str(i + 1) + "_" + images[i]['id']

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

            try:
                getFile(filename, short_filename, folder_dir, images[i]['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 == count:
            raise FileAlreadyExistsError
        elif how_many_downloaded + duplicates < count:
            raise AlbumNotDownloadedCompletely("Album Not Downloaded Completely")