from crossref_commons.iteration import iterate_publications_as_json
from crossref_commons.retrieval import get_entity
from crossref_commons.types import EntityType, OutputType
from .PapersFilters import similarStrings
from .Paper import Paper
import requests
import time
import random


def getBibtex(DOI):
    try:
        url_bibtex = "http://api.crossref.org/works/" + DOI + "/transform/application/x-bibtex"
        x = requests.get(url_bibtex)
        if x.status_code == 404:
            return ""
        return str(x.text)
    except Exception as e:
        print(e)
        return ""


def getPapersInfoFromDOIs(DOI, restrict):
    paper_found = Paper()
    paper_found.DOI = DOI

    try:
        paper = get_entity(DOI, EntityType.PUBLICATION, OutputType.JSON)
        if paper!=None and len(paper)>0:
            if "title" in paper:
                paper_found.title = paper["title"][0]
            if "short-container-title" in paper and len(paper["short-container-title"])>0:
                paper_found.jurnal = paper["short-container-title"][0]

            if restrict==None or restrict!=1:
                paper_found.setBibtex(getBibtex(paper_found.DOI))
    except:
        print("Paper not found "+DOI)

    return paper_found


#Get paper information from Crossref and return a list of Paper
def getPapersInfo(papers, scholar_search_link, restrict, scholar_results):
    papers_return = []
    num = 1
    for paper in papers:
        #while num <= scholar_results:
        title = paper['title']
        queries = {'query.bibliographic': title.lower(),'sort':'relevance',"select":"DOI,title,deposited,author,short-container-title"}

        print("Searching paper {} of {} on Crossref...".format(num,len(papers)))
        num += 1

        found_timestamp = 0
        paper_found = Paper(title,paper['link'],scholar_search_link, paper['cites'], paper['link_pdf'], paper['year'], paper['authors'])
        while True:
            try:
                for el in iterate_publications_as_json(max_results=30, queries=queries):

                    el_date = 0
                    if "deposited" in el and "timestamp" in el["deposited"]:
                        el_date = int(el["deposited"]["timestamp"])

                    if (paper_found.DOI==None or el_date>found_timestamp) and "title" in el and similarStrings(title.lower() ,el["title"][0].lower())>0.75:
                        found_timestamp = el_date

                        if "DOI" in el:
                            paper_found.DOI = el["DOI"].strip().lower()
                        if "short-container-title" in el and len(el["short-container-title"])>0:
                            paper_found.jurnal = el["short-container-title"][0]

                        if restrict==None or restrict!=1:
                            paper_found.setBibtex(getBibtex(paper_found.DOI))

                break
            except ConnectionError as e:
                print("Wait 10 seconds and try again...")
                time.sleep(10)

        papers_return.append(paper_found)

        time.sleep(random.randint(1,10))

    return papers_return
