"""
Cellar text and eurovoc extraction

	python update.py 10000 dataset.jsonl

will extract for the last 10,000 days text in english and eurovoc labels in the JSON line file.


requirements:
beautifulsoup4==4.12.2
docx2txt==0.8
ipython==8.14.0
jinja2==3.1.2
joblib==1.3.1
pdfminer.six==20221105
pip-chill==1.0.3
pycryptodome==3.18.0
requests==2.31.0
tqdm==4.65.0
xmltodict==0.13.0
"""


import datetime
import json
from concurrent.futures import ProcessPoolExecutor

from bs4 import BeautifulSoup
import logging
import re
import sys

from tqdm import tqdm
from io import BytesIO
import jinja2
from joblib import Memory


location = './cache'
memory = Memory(location, verbose=0)

log = logging.getLogger(__name__)
log.addHandler(logging.FileHandler('collect.log'))
log.setLevel(logging.DEBUG)

import xmltodict

import docx2txt as docx2txt
import requests
from joblib import expires_after
from pdfminer.high_level import extract_text

user_agent = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36'


def clean_text(func):
    """
    Decorator used to clean the text
    :param func:
    :return:
    """
    def inner(*args, **kwargs):
        text = func(*args, **kwargs)
        
        # Handle None or empty returns
        if not text:
            return ""
        
        text = text.replace("\n", " ")
        text = text.replace(" .", ".")
        text = re.sub(' +', ' ', text)
        text = re.sub(' *[.] *', '. ', text)
        text = re.sub(r'\.\s*\.\s*\.+', '. ', text)
        text = '. '.join([s.strip() for s in text.split(".") if len(s.strip())])
        return text

    return inner


@memory.cache(cache_validation_callback=expires_after(minutes=120))
def get_eurovoc_terms_and_id_old():
    eurovoc_terms_and_id = {}
    response = requests.get('http://publications.europa.eu/resource/dataset/eurovoc',
                            headers={'Accept': 'application/xml',
                                     'Accept-Language': 'en',
                                     'User-Agent': user_agent
                                     }
                            )
    data = xmltodict.parse(response.content)
    for term in data['xs:schema']['xs:simpleType']['xs:restriction']['xs:enumeration']:
        try:
            name = term['xs:annotation']['xs:documentation'].split('/')[0].strip()
            for r in term['xs:annotation']['xs:appinfo']['record']:
                if r['@thesaurus_id'] != '':
                    eurovoc_terms_and_id[name.lower()] = r['@thesaurus_id']
        except KeyError as e:
            log.warning("⚠️ Could not parse", term)
    return eurovoc_terms_and_id


@memory.cache(cache_validation_callback=expires_after(minutes=120))
def get_eurovoc_terms_and_id():
    eurovoc_terms_and_id = {}
    response = requests.get('http://publications.europa.eu/resource/dataset/eurovoc',
                            headers={'Accept': 'application/xml',
                                     'Accept-Language': 'en',
                                     'User-Agent': user_agent
                                     }
                            )
    data = xmltodict.parse(response.content)
    for term in data['xs:schema']['xs:simpleType']['xs:restriction']['xs:enumeration']:
        try:
            name = term['xs:annotation']['xs:documentation'].split('/')[0].strip()
            eurovoc_id = term['@value'].split(':')[1]
            eurovoc_terms_and_id[name.lower()] = eurovoc_id
        except (KeyError, IndexError) as e:
            log.warning("⚠️ Could not parse", term)
    return eurovoc_terms_and_id


def get_sparql_query(d):
    start = d.strftime('%Y-%m-%d')
    end = d + datetime.timedelta(days=2)
    end = end.strftime('%Y-%m-%d')
    environment = jinja2.Environment()
    template = environment.from_string(open("query.j2", 'r').read())
    return template.render(start=start, end=end)


def get_json_response(d):
    url = "https://publications.europa.eu/webapi/rdf/sparql"
    headers = {'User-Agent': user_agent}
    params = {"default-graph-uri": "",
              "query": get_sparql_query(d),
              "format": "application/sparql-results+json",
              "timeout": "0",
              "debug": "on",
              "run": "Run Query"}

    response = requests.get(url, headers=headers, params=params)
    assert response.status_code == 200
    return response.json()


def get_concepts_id(list_of_eurovoc_terms):
    terms = get_eurovoc_terms_and_id()
    # keep track of returned IDs
    seen = set()   

    for e in list_of_eurovoc_terms:
        try:
            concept_id = terms[e.strip().lower()]

            if concept_id not in seen:
                seen.add(concept_id)
                yield concept_id

        except KeyError:
            log.warning(f"⚠️ Could not find {e} in Eurovoc")

def get_docs(d):
    results = get_json_response(d)
    for r in results['results']['bindings']:
        try:
            # Get terms safely
            subjects_value = r.get('subjects', {}).get('value', '')
            if not subjects_value:
                log.warning(f"⚠️ No subjects found for record")
                continue
                
            terms = subjects_value.replace(u'\xa0', u' ').split(',')
            # Remove empty strings
            terms = [t.strip() for t in terms if t.strip()]  
            
            if not terms:
                log.warning(f"⚠️ No valid terms after splitting")
                continue
            
            r['eurovoc_concepts'] = terms
            
            # Generate IDs - guarantee it's a list
            eurovoc_concepts_ids = list(get_concepts_id(terms))
            r['eurovoc_concepts_ids'] = eurovoc_concepts_ids if eurovoc_concepts_ids else []
            
            # Skip records with no valid IDs
            if not r['eurovoc_concepts_ids']:
                log.warning(f"⚠️ Skipping record with no valid eurovoc_concepts_ids: {r.get('title', {}).get('value', 'unknown')}")
                continue
            
            r['url'] = r['cellarURIs']['value']
            r['title'] = r['title']['value']
            r['date'] = r['date']['value']
            r['lang'] = r['langIdentifier']['value'].lower()
            r['formats'] = [t.strip() for t in r['mtypes']['value'].split(',')]
            
            for c in ['cellarURIs', 'mtypes', 'langIdentifier', 'subjects', 'authors', 'workTypes', 'workIds']:
                if c in r:
                    del r[c]
                    
            yield r
            
        except Exception as e:
            log.error(f"⚠️ Error processing record in get_docs: {e}")
            continue


def get_docs_text(d):
    docs = list(get_docs(d))
    print(f"Processing documents ... {len(docs)}")
    with ProcessPoolExecutor(max_workers=16) as executor:
        for v in tqdm(executor.map(get_body, docs), total=len(docs), colour='green'):
            # Filter out None results
            if v is not None:
                yield v


def get_body(r):
    try:
        text = None
        
        if 'pdf' in r['formats']:
            text = get_pdf_body(r)
        elif 'docx' in r['formats']:
            text = get_docx_body(r)
        elif 'doc' in r['formats']:
            text = get_doc_body(r)
        elif 'xhtml' in r['formats']:
            text = get_xhtml_body(r)
        elif 'html' in r['formats']:
            text = get_html_body(r)
        else:
            log.warning(f"⚠️ Could not find a parser for {r['formats']}")
            return None
        
        r['text'] = text
        
        # Validate: must have text and eurovoc_concepts
        if not text or not text.strip():
            log.warning(f"⚠️ No text extracted for {r.get('url', 'unknown')}")
            return None
        
        if not r.get('eurovoc_concepts') or len(r.get('eurovoc_concepts', [])) == 0:
            log.warning(f"⚠️ No eurovoc_concepts for {r.get('url', 'unknown')}")
            return None
            
        return r
        
    except Exception as e:
        log.error(f"⚠️ Exception in get_body: {str(e)} for record: {r.get('url', 'unknown')}")
        return None


@clean_text
@memory.cache()
def get_pdf_body(r):
    url = r['url']
    language = r['lang']
    accept = 'application/pdf'
    response = requests.get(url, headers={'Accept': accept, 'Accept-Language': language, 'User-Agent': user_agent})
    if response.status_code == 300:
        return " ".join(_multiple_choice(get_pdf_body, response, accept, language))
    elif response.status_code == 200:
        mem = BytesIO(response.content)
        return extract_text(mem)
    else:
        log.warning(f"⚠️ PDF fetch failed with status {response.status_code} for {url}")
        return ""


@clean_text
@memory.cache()
def get_xhtml_body(r):
    url = r['url']
    language = r['lang']
    accept = 'application/xhtml+xml'
    response = requests.get(url, headers={'Accept': accept, 'Accept-Language': language, 'User-Agent': user_agent})
    if response.status_code == 300:
        return " ".join(_multiple_choice(get_xhtml_body, response, accept, language))
    elif response.status_code == 200:
        soup = BeautifulSoup(response.content, 'html.parser')
        return soup.get_text()
    else:
        log.warning(f"⚠️ XHTML fetch failed with status {response.status_code} for {url}")
        return ""


@clean_text
@memory.cache()
def get_html_body(r):
    """Handle plain HTML format"""
    url = r['url']
    language = r['lang']
    accept = 'text/html'
    response = requests.get(url, headers={'Accept': accept, 'Accept-Language': language, 'User-Agent': user_agent})
    if response.status_code == 300:
        return " ".join(_multiple_choice(get_html_body, response, accept, language))
    elif response.status_code == 200:
        soup = BeautifulSoup(response.content, 'html.parser')
        return soup.get_text()
    else:
        log.warning(f"⚠️ HTML fetch failed with status {response.status_code} for {url}")
        return ""


def get_docx_body(r):
    accept = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml'
    url = r['url']
    lang = r['lang']
    try:
        return _get_doc_body(url, accept, lang)
    except AssertionError as e:
        log.warning(f"⚠️ Could not download {url} {e}")
        return ""


def get_doc_body(r):
    accept = 'application/msword'
    url = r['url']
    lang = r['lang']
    try:
        return _get_doc_body(url, accept, lang)
    except AssertionError as e:
        log.warning(f"⚠️ Could not download {url} {e}")
        return ""


def _multiple_choice(func, response, accept, language):
    soup = BeautifulSoup(response.text, 'html.parser')
    for link in soup.find_all('a'):
        if 'href' in link.attrs:
            url = link.attrs['href']
            yield func(url, accept, language)


@clean_text
@memory.cache()
def _get_doc_body(url, accept, language='en'):
    response = requests.get(url, headers={'Accept': accept, 'Accept-Language': language, 'User-Agent': user_agent})
    if response.status_code == 300:
        return " ".join(_multiple_choice(_get_doc_body, response, accept, language))
    elif response.status_code == 200:
        mem = BytesIO(response.content)
        log.info(f"📄 MS Word doc download and parsed {url}")
        return docx2txt.process(mem)
    else:
        log.warning(f"📄 MS Word doc download failed {url} {response.status_code}")
        return ""


if __name__ == '__main__':
    output = sys.argv[1]
    max = int(sys.argv[2])
    ofiles = {}
    valid_count = 0
    skipped_count = 0
    
    for i in range(max):
        d = datetime.date.today() - datetime.timedelta(days=i)
        print(d)
        ym = d.strftime('%Y-%m')
        if ym not in ofiles:
            ofiles[ym] = open(output + ym + '.jsonl', 'w')
        try:
            for doc in get_docs_text(d):
                if doc is not None:
                    # Extra validation before writing
                    if doc.get('text') and doc.get('eurovoc_concepts_ids'):
                        ofiles[ym].write(json.dumps(doc) + '\n')
                        ofiles[ym].flush()
                        valid_count += 1
                    else:
                        skipped_count += 1
                        log.warning(f"⚠️ Skipping invalid doc in main loop")
                else:
                    skipped_count += 1
        except Exception as e:
            log.error('Day ' + str(d) + ' ' + str(e))
            print('Day ' + str(d) + ' ' + str(e))
    
    for f in ofiles.values():
        f.close()
    
    print(f"\n✓ Download complete!")
    print(f"  Valid records: {valid_count}")
    print(f"  Skipped records: {skipped_count}")