def historic_doslegs_parse(html, url_an=None, logfile=sys.stderr, nth_dos_in_page=0, parse_previous_works=True, parse_next_works=True):
    """
    Parse an AN dosleg like http://www.assemblee-nationale.fr/13/dossiers/accord_Montenegro_mobilite_jeunes.asp

    nth_dos_in_page, parse_previous_works and parse_next_works are for internal logic
    """

    data = {
        'url_dossier_assemblee': clean_url(url_an),
        'urgence': False,
    }

    def log_error(*error):
        print('## ERROR ###', *error, file=logfile)

    def log_warning(*error):
        print('## WARNING ###', *error, file=logfile)

    soup = BeautifulSoup(html, 'lxml')

    legislature, slug = parse_national_assembly_url(data['url_dossier_assemblee'])
    data['assemblee_slug'] = slug
    if legislature:
        data['assemblee_legislature'] = legislature
    else:  # strange link (old dosleg)
        log_error('NO LEGISLATURE IN AN LINK: ' + data['url_dossier_assemblee'])
    data['assemblee_id'] = '%s-%s' % (data.get('assemblee_legislature', ''), data['assemblee_slug'])

    data['steps'] = []
    curr_institution = 'assemblee'
    curr_stage = '1ère lecture'
    last_section = None  # Travaux des commissions/Discussion en séance publique
    last_step_index = 0
    travaux_prep_already = False
    another_dosleg_inside = None
    predicted_next_step = None  # For unfinished projects, we try to catch the next step
    previous_works = None
    url_jo = None

    html_lines = html.split('\n')
    for i, line in enumerate(html_lines):
        def parse_line():
            return BeautifulSoup(line, 'lxml')

        def line_text():
            return parse_line().text.strip()

        def get_last_step():
            if len(data['steps']) > 0:
                return data['steps'][-1]
            return {}

        if '<COMMENTAIRE>' in line or '<table border="1"' in line:
            continue

        if '<font face="ARIAL" size="3" color="#000080">' in line:
            data['long_title'] = line_text()
        if '<br><b><font color="#000099">Travaux des commissions</font></b><br>' in line:
            last_section = line_text()
        if '<p align="center"><b><font color="#000080">Travaux préparatoires</font></b><br>' in line:
            if travaux_prep_already:
                if parse_next_works and not nth_dos_in_page:
                    log_warning('FOUND ANOTHER DOSLEG INSIDE THE DOSLEG')
                    another_dosleg_inside = '\n'.join(html.split('\n')[last_step_index + 1:])
                if not nth_dos_in_page:
                    break
                travaux_prep_already = False
            else:
                travaux_prep_already = True
        if not parse_next_works and travaux_prep_already and nth_dos_in_page:
            continue

        # Senat 1ère lecture, CMP, ...
        if '<font color="#000099" size="2" face="Arial">' in line:
            text = line_text()
            last_section = None
            if 'Dossier en ligne sur le site du Sénat' in text:
                data['url_dossier_senat'] = clean_url(parse_line().select(
                    'a')[-1].attrs['href'])
                text = text.replace(
                    '(Dossier en ligne sur le site du Sénat)', '')
            if 'Sénat' in text:
                curr_institution = 'senat'
            elif 'Assemblée nationale' in text:
                curr_institution = 'assemblee'
            elif 'Commission Mixte Paritaire' in text or 'Lecture texte CMP' in text:
                curr_institution = 'CMP'
                curr_stage = 'CMP'
            elif 'Conseil Constitutionnel' in text:
                curr_institution = 'conseil constitutionnel'
                curr_stage = 'constitutionnalité'
            elif 'Congrès du Parlement' in text:
                curr_institution = 'congrès'
                curr_stage = 'congrès'

            if '1ère lecture' in text:
                curr_stage = '1ère lecture'
            elif '2e lecture' in text:
                curr_stage = '2ème lecture'
            elif 'Nouvelle lecture' in text:
                curr_stage = 'nouv. lect.'
            elif 'Lecture définitive' in text:
                curr_stage = 'l. définitive'
            if not curr_stage:
                curr_stage = text.split('-')[-1].strip().lower()

            if curr_stage == "création de la commission d'enquête":
                log_warning('COMMISSION D\'ENQUETE')
                return None

        if '>Proposition de résolution européenne<' in line:
            log_warning('PROPOSITION DE RESOLUTION EUROPEENE')
            return None

        if '>Accès aux Travaux préparatoires' in line and not previous_works:
            previous_works = clean_url(urljoin(url_an, parse_line().find('a').attrs['href']))

        curr_step = None
        # conseil. consti. has no step but we should get the link
        no_step_but_good_link = False
        if 'Rapport portant également sur les propositions' in line:
            continue
        elif re.search(r'<a[^>]* href=[^>]*>(projet de loi|proposition de loi|proposition de résolution)', line, re.I):
            curr_step = 'depot'
            if curr_stage == 'CMP':
                continue
        elif ">Texte de la commission" in line or '/ta-commission/' in line:
            curr_step = 'commission'

        elif '/ta/' in line or '/leg/tas' in line:
            if get_last_step().get('stage') != curr_stage:
                curr_step = 'depot'
                if curr_stage == 'CMP':
                    curr_step = 'commission'
            else:
                curr_step = 'hemicycle'
        elif ('/rapports/' in line or '/rap/' in line) and last_section and 'commissions' in last_section:
            if get_last_step().get('step') == 'commission':
                # log_warning('DOUBLE COMMISSION LINE: %s' % line)
                continue
            curr_step = 'commission'

        elif 'www.conseil-constitutionnel.fr/decision/' in line:
            no_step_but_good_link = True

        # no commissions for l. définitive
        if curr_stage == 'l. définitive' and curr_step == 'commission':
            continue

        if curr_step or no_step_but_good_link:
            # if same step previously, replace or not the url
            if get_last_step().get('step') == curr_step:
                # log_warning('DOUBLE STEP: %s' % line)
                # remove last step since we prefer text links instead of reports links
                # TODO: add report link as bonus_url
                last_url = get_last_step().get('source_url')
                if not last_url or ('/rapports/' in last_url or '/rap/' in last_url):
                    data['steps'] = data['steps'][:-1]
                # looks like the last url was already a text, let's assume it's a multi-depot
                else:
                    # multi-depot if not CMP
                    # TODO: re-order multi depot
                    if curr_institution == 'senat' and curr_stage != 'CMP':
                        curr_step = 'depot'

            links = [a.attrs.get('href') for a in parse_line().select('a')]
            links = [
                href for href in links if href and 'fiches_id' not in href and '/senateur/' not in href and 'javascript:' not in href]
            if not links:
                log_error('NO LINK IN LINE: %s' % (line,))
                continue
            urls_raps = []
            urls_others = []
            for href in links:
                if '/rap/' in href or '/rapports/' in href:
                    urls_raps.append(href)
                else:
                    urls_others.append(href)

            cmp_commission_other_url = None
            if len(urls_others) > 0:
                url = urls_others[0]
                # CMP commission should produce two texts, one for each institution
                if curr_step == 'commission' and curr_stage == 'CMP' and len(urls_others) > 1:
                    cmp_commission_other_url = clean_url(urljoin(url_an, urls_others[1]))
            else:
                url = urls_raps[0]

            url = clean_url(urljoin(url_an, url))

            real_institution = curr_institution
            if curr_stage == 'CMP' and curr_step == 'hemicycle':
                if 'assemblee-nationale.fr' in url:
                    real_institution = 'assemblee'
                elif 'senat.fr' in url:
                    real_institution = 'senat'

            step = {
                'institution': real_institution,
                'stage': curr_stage,
                'source_url': url,
            }

            if curr_step:
                step['step'] = curr_step

            if cmp_commission_other_url:
                step['cmp_commission_other_url'] = cmp_commission_other_url

            # try to detect a date
            for test_line in (line, html_lines[i-1]):
                test_line = test_line.replace('1<sup>er</sup>', '1')
                date_match = re.search(r'(déposée? le|adoptée? .*? le|modifiée? .*?|rejetée? .*?)\s*(\d\d? \w\w\w+ \d\d\d\d)', test_line, re.I)
                if date_match:
                    step['date'] = format_date(date_match.group(2))
                else:
                    date_match = re.search(r'(mis en ligne le)\s*(\d\d? \w\w\w+ \d\d\d\d)', test_line, re.I)
                    if date_match:
                        step['date'] = format_date(date_match.group(2))
                if 'date' in step and 'beginning' not in data:
                    data['beginning'] = step['date']
            data['steps'].append(step)
            predicted_next_step = None
            last_step_index = i

        if 'publiée au Journal Officiel' in line and not url_jo:
            links = [clean_url(a.attrs['href']) for a in parse_line().select('a') if 'legifrance' in a.attrs.get('href', '')]
            if not links:
                log_error('NO GOOD LINK IN LINE: %s' % (line,))
                continue
            url_jo = links[-1]

        if 'Le Gouvernement a engagé la procédure accélérée' in line or 'engagement de la procédure accélérée' in line:
            data['urgence'] = True

        # Next step prediction via small clues
        # TODO: this could be done via last_section (we parse two times the same thing)
        # TODO: this fails for CMP hemicycle senat
        if curr_stage != 'CMP':
            if '>Discussion en séance publique<' in line:
                predicted_next_step = {
                    'institution': curr_institution,
                    'stage': curr_stage,
                    'step': 'hemicycle',
                }
            elif '>Travaux des commissions<' in line:
                predicted_next_step = {
                    'institution': curr_institution,
                    'stage': curr_stage,
                    'step': 'commission',
                }

    metas = {}
    for meta in soup.select('meta'):
        if 'name' in meta.attrs:
            metas[meta.attrs['name']] = meta.attrs['content']

    if not url_jo:
        url_jo = metas.get('LIEN_LOI_PROMULGUEE')

    if url_jo:
        data['url_jo'] = clean_url(url_jo)
        promulgation_step = {
            'institution': 'gouvernement',
            'stage': 'promulgation',
            'source_url': data['url_jo'],
        }
        if metas.get('LOI_PROMULGUEE'):
            data['end'] = find_promulgation_date(metas.get('LOI_PROMULGUEE'))
            promulgation_step['date'] = data['end']
        data['steps'].append(promulgation_step)
    # add predicted next step for unfinished projects
    elif predicted_next_step:
        data['steps'].append(predicted_next_step)

    if 'url_dossier_senat' not in data or 'dossier-legislatif' not in data['url_dossier_senat']:
        senat_url = find_senat_url(data)
        if senat_url:
            data['url_dossier_senat'] = senat_url

    # append previous works if there are some
    if previous_works and parse_previous_works:
        log_warning('MERGING %s WITH PREVIOUS WORKS %s' % (url_an, previous_works))
        resp = download_historic_dosleg(previous_works)
        prev_data = historic_doslegs_parse(
            resp.text, previous_works,
            logfile=logfile,
            nth_dos_in_page=nth_dos_in_page, parse_next_works=False)
        if prev_data:
            prev_data = prev_data[nth_dos_in_page] if len(prev_data) > 1 else prev_data[0]
            data = merge_previous_works_an(prev_data, data)
        else:
            log_warning('INVALID PREVIOUS WORKS', previous_works)

    # is this part of a dosleg previous works ?
    next_legislature = data['assemblee_legislature'] + 1 if 'assemblee_legislature' in data else 9999
    if parse_next_works and next_legislature < 15:
        #  TODO: parse 15th legislature from open data if it exists
        resp = download_historic_dosleg(url_an.replace('/%d/' % data['assemblee_legislature'], '/%d/' % (data['assemblee_legislature'] + 1)))
        if resp.status_code == 200:
            recent_data = historic_doslegs_parse(
                resp.text, resp.url,
                logfile=logfile,
                nth_dos_in_page=nth_dos_in_page, parse_previous_works=False)
            if recent_data:
                log_warning('FOUND MORE RECENT WORKS', resp.url)
                recent_data = recent_data[nth_dos_in_page] if len(recent_data) > 1 else recent_data[0]
                data = merge_previous_works_an(data, recent_data)

    if another_dosleg_inside:
        others = historic_doslegs_parse(another_dosleg_inside, url_an, logfile=logfile, nth_dos_in_page=nth_dos_in_page+1)
        if others:
            return [data] + others
    return [data]