troggle/parsers/logbooks.py

import csv
import os
import re
import time
from random import randint
from datetime import datetime, date
from pathlib import Path

from django.conf import settings
from django.template.defaultfilters import slugify
from django.utils.timezone import get_current_timezone, make_aware

from troggle.core.models.troggle import DataIssue, Expedition
from troggle.core.utils import TROG, save_carefully
from troggle.core.models.caves import Cave, LogbookEntry, PersonTrip, GetCaveLookup
from parsers.people import GetPersonExpeditionNameLookup

'''
Parses and imports logbooks in all their wonderful confusion
   See detailed explanation of the complete process:
    https://expo.survex.com/handbook/computing/logbooks-parsing.html
'''
todo='''
- refactor everything with some urgency, esp. LoadLogbookForExpedition()

- remove the TROG and lbo things since we need the database for multiuser access? Or not?

- profile the code to find bad repetitive things, of which there are many.

- far too many uses of Django field dereferencing to get values, which is SLOW

- Logbooks 1987, 1988, 1989 all crash on MySql - but not sqlite - with db constraint fail. Edit logbook to fix.

- import/parse/re-export-as-html the 'artisanal-format' old logbooks so that
  we keep only a modern HTML05 format. Then we can retire the old parsers and reduce the
  volume of code here substantially.

- rewrite to use generators rather than storing everything intermediate in lists - to reduce memory impact.
  
- We should ensure logbook.html is utf-8 and stop this crap:             
            file_in = open(logbookfile,'rb')
            txt = file_in.read().decode("latin1")
            
- this is a slow and uncertain function:  cave = getCaveByReference(caveRef)

- use Fixtures https://docs.djangoproject.com/en/4.1/ref/django-admin/#django-admin-loaddata to cache
data for old logbooks. New design needed, with a mechanism for flagging fixtures as outdated after edits.

'''
MAX_LOGBOOK_ENTRY_TITLE_LENGTH = 200
BLOG_PARSER_SETTINGS = {
#               "2022": ("ukcavingblog.html", "parser_blog"), 
#               "2019": ("ukcavingblog.html", "parser_blog"), 
#               "2018": ("ukcavingblog.html", "parser_blog"), 
#               "2017": ("ukcavingblog.html", "parser_blog"), # now folded in to logbooks.html
            }
DEFAULT_LOGBOOK_FILE = "logbook.html"
DEFAULT_LOGBOOK_PARSER = "parser_html"
# All years since 2002 use the default value for Logbook parser
LOGBOOK_PARSER_SETTINGS = {               
#               "2009": ("2009logbook.txt", "wiki_parser"), # converted to html
#               "2008": ("2008logbook.txt", "wiki_parser"), # converted to html
#               "2006": ("logbook/logbook_06.txt", "wiki_parser"), # converted to html
                "2002": ("logbook.html", "parser_html"), 
                "2001": ("log.htm", "parser_html_01"), 
                "2000": ("log.htm", "parser_html_01"), 
                "1999": ("log.htm", "parser_html_01"), 
                "1998": ("log.htm", "parser_html_01"), 
                "1997": ("log.htm", "parser_html_01"), 
                "1996": ("log.htm", "parser_html_01"),
                "1995": ("log.htm", "parser_html_01"), 
                "1994": ("log.htm", "parser_html_01"), 
                "1993": ("log.htm", "parser_html_01"), 
                "1992": ("log.htm", "parser_html_01"), 
                "1991": ("log.htm", "parser_html_01"), 
                "1990": ("log.htm", "parser_html_01"), 
                "1989": ("log.htm", "parser_html_01"), #crashes MySQL
                "1988": ("log.htm", "parser_html_01"), #crashes MySQL
                "1987": ("log.htm", "parser_html_01"), #crashes MySQL
                "1985": ("logbook.html", "parser_html"), 
                "1984": ("logbook.html", "parser_html"), 
                "1983": ("logbook.html", "parser_html"), 
                "1982": ("logbook.html", "parser_html"), 
            }

entries = { "2022": 86, "2019": 56, "2018": 100, "2017": 76, "2016": 83, "2015": 79, 
    "2014": 65, "2013": 51, "2012": 75, "2011": 68, "2010": 22, "2009": 53, 
    "2008": 49, "2007": 113, "2006": 60, "2005": 55, "2004": 76, "2003": 42, "2002": 31, 
    "2001": 48, "2000": 54, "1999": 79, "1998": 43, "1997": 53, "1996": 95, "1995": 42, 
    "1994": 32, "1993": 41, "1992": 62, "1991": 39, "1990": 87, "1989": 1,"1988": 1,"1987": 1,
    "1985": 24, "1984": 32, "1983": 52, "1982": 42,}
# Logbooks log.htm exist for 87, 88, 89 but have no full-working parser, or need hand-editing.

logentries = [] # the entire logbook for one year is a single object: a list of entries
noncaveplaces = [ "Journey", "Loser Plateau", "UNKNOWN", 'plateau', 
        'base camp', 'basecamp', 'top camp', 'topcamp' ]
logdataissues = TROG['issues']['logdataissues']
trips ={}

#
# the logbook loading section
#
def set_trip_id(year, seq):
    tid= f"{year}_s{seq:02d}"
    return tid

rx_tripperson   = re.compile(r'(?i)<u>(.*?)</u>$')
rx_round_bracket = re.compile(r"[\(\[].*?[\)\]]")

    
def GetTripPersons(trippeople, expedition, logtime_underground, tid=None):
    res = [ ]
    author = None
    # print(f'# {tid}')
    # print(f" -  {tid} '{trippeople}'  ")

    for tripperson in re.split(r",|\+|&amp;|&(?!\w+;)| and ", trippeople):
        tripperson = tripperson.strip()
        # mul = re.match(r"(?i)<u>(.*?)</u>$", tripperson)
        mul = rx_tripperson.match(tripperson)
        if mul:
            tripperson = mul.group(1).strip()
        if tripperson and tripperson[0] != '*':
            tripperson = re.sub(rx_round_bracket, "", tripperson).strip()
            
            # these aliases should be moved to people.py GetPersonExpeditionNameLookup(expedition)
            if tripperson =="Wiggy":
                tripperson = "Phil Wigglesworth"
            if tripperson =="Animal":
                tripperson = "Mike Richardson"
            if tripperson =="MikeTA":
                tripperson = "Mike Richardson"
            if tripperson =="CavingPig":
                tripperson = "Elaine Oliver"
            if tripperson =="nobrotson":
                tripperson = "Rob Watson"
            if tripperson =="Tinywoman":
                tripperson = "Nadia"
            if tripperson =="tcacrossley":
                tripperson = "Tom Crossley"
            if tripperson =="Samouse1":
                tripperson = "Todd Rye"
                

                            
            personyear = GetPersonExpeditionNameLookup(expedition).get(tripperson.lower())
            if not personyear:
                message = f" ! - {expedition.year} No name match for: '{tripperson}' in entry {tid=} for this expedition year." 
                print(message)
                DataIssue.objects.create(parser='logbooks', message=message)
                logdataissues[tid]=message
            res.append((personyear, logtime_underground))
            if mul:
                author = personyear
    if not author:
        if not res:
            return "", 0
        author = res[-1][0] # the previous valid person and a time of 0 hours
        
    #print(f" -  {tid}  [{author.person}] '{res[0][0].person}'...")
    return res, author

def EnterLogIntoDbase(date, place, title, text, trippeople, expedition, logtime_underground, tid=None):
    """ saves a logbook entry and related persontrips 
    Does NOT save the expeditionday_id  - all NULLs. why? Because we are deprecating expeditionday !
    
    troggle.log shows that we are creating lots of duplicates, which is no no problem with SQL as they just overwrite but we are saving the  same thing too many times.. 
    
    Until 18 Dec.2022, this was overwriting logbook entries for the same date with the same title, because
    lookupAttribs={'date':date, 'title':title}
    """
 
    # Nasty hack, must tidy this up..
    if logtime_underground:
        try:
            logtime_underground = float(logtime_underground)
        except:
            # print(f"logtime_underground = {logtime_underground}")
            tu_match = re.match(r"(T/U:\s*)?(\d+[.]?\d*).*", logtime_underground)
            if tu_match:
                # print(f"logtime_underground = {tu_match.group(2)}")
                logtime_underground = float(tu_match.group(2))
            else:
                logtime_underground = 0
    else:
        logtime_underground = 0

    try:
        trippersons, author = GetTripPersons(trippeople, expedition, logtime_underground, tid=tid)
        # print(f" - {author} - {logtime_underground}")
    except:
        message = f" ! - {expedition.year} Skipping logentry: {title} - GetTripPersons FAIL"
        DataIssue.objects.create(parser='logbooks', message=message)
        logdataissues["title"]=message
        print(message)
        raise
        return
        
    if not author:
        message = f" ! - {expedition.year} Warning: logentry: {title} - no expo member author for entry '{tid}'"
        DataIssue.objects.create(parser='logbooks', message=message)
        logdataissues["title"]=message
        print(message)
        #return

    # This needs attention. The slug field is derived from 'title'
    # both GetCaveLookup() and GetTripCave() need to work together better. None of this data is *used* though?
    #tripCave = GetTripCave(place):

    lplace = place.lower()
    cave=None
    if lplace not in noncaveplaces:
        cave = GetCaveLookup().get(lplace)
    
    y = str(date)[:4]

    text = text.replace(' src="', f' src="/years/{y}/' )
    text = text.replace(" src='", f" src='/years/{y}/" )
    
    text = text.replace(f' src="/years/{y}//years/{y}/', f' src="/years/{y}/' )
    text = text.replace(f" src='/years/{y}//years/{y}/", f" src='/years/{y}/" )

    text = text.replace('\t', '' )
    text = text.replace('\n\n\n', '\n\n' )

    #Check for an existing copy of the current entry, and save
    expeditionday = expedition.get_expedition_day(date)
    lookupAttribs={'date':date, 'title':title}
    # 'cave' is converted to a string doing this, which renders as the cave slug.
    # but it is a db query which we should try to avoid - rewrite this
    
    #NEW slug for a logbook entry here! Unique id + slugified title fragment
    
    if tid is not None:
        slug = tid
        # slug = tid + "_" + slugify(title)[:10].replace('-','_')
    else: 
        slug = str(randint(1000,9999)) + "_" + slugify(title)[:10].replace('-','_')
    nonLookupAttribs={'place':place, 'text':text, 'expedition':expedition, 
        'time_underground':logtime_underground, 'cave_slug':str(cave), 'slug': slug}
    
    # This creates the lbo instance of LogbookEntry
    lbo, created=save_carefully(LogbookEntry, lookupAttribs, nonLookupAttribs)
    
    # for PersonTrip time_underground is float (decimal hours)
    for tripperson, time_underground in trippersons:
        # print(f" -  {tid} '{tripperson}' author:{tripperson == author}")
        lookupAttribs={'personexpedition':tripperson, 'logbook_entry':lbo}
        nonLookupAttribs={'time_underground':time_underground, 'is_logbook_entry_author':(tripperson == author)}
        # this creates the PersonTrip instance. 
        save_carefully(PersonTrip, lookupAttribs, nonLookupAttribs)

def ParseDate(tripdate, year):
    """ Interprets dates in the expo logbooks and returns a correct datetime.date object  """
    dummydate = date(1970, 1, 1)
    month = 1
    day = 1
    # message = f" ! - Trying to parse date in logbook: {tripdate} - {year}"
    # print(message)
    try:
        mdatestandard = re.match(r"(\d\d\d\d)-(\d\d)-(\d\d)", tripdate)
        mdategoof = re.match(r"(\d\d?)/0?(\d)/(20|19)?(\d\d)", tripdate)
        if mdatestandard:
            if not (mdatestandard.group(1) == year):
                message = f" ! - Bad date (year) in logbook: {tripdate} - {year}"
                DataIssue.objects.create(parser='logbooks', message=message)
                logdataissues["tripdate"]=message
                return dummydate
            else:
                year, month, day = int(mdatestandard.group(1)), int(mdatestandard.group(2)), int(mdatestandard.group(3))
        elif mdategoof:
            if not (not mdategoof.group(3) or mdategoof.group(3) == year[:2]):
                message = " ! - Bad date mdategoof.group(3) in logbook: " + tripdate + " - " + mdategoof.group(3)
                DataIssue.objects.create(parser='logbooks', message=message)
                logdataissues["tripdate"]=message
                return dummydate
            else:
                yadd = int(year[:2]) * 100
                day, month, year = int(mdategoof.group(1)), int(mdategoof.group(2)), int(mdategoof.group(4)) + yadd
        else:
            year = 1970
            message = f" ! - Bad date in logbook: {tripdate} - {year}"
            DataIssue.objects.create(parser='logbooks', message=message)
            logdataissues["tripdate"]=message

        return date(year, month, day)
    except:
        message = f" ! - Failed to parse date in logbook: {tripdate} - {year}"
        DataIssue.objects.create(parser='logbooks', message=message)
        logdataissues["tripdate"]=message
        return datetime.date(1970, 1, 1)
        
# 2002, 2004 - now
def parser_html(year, expedition, txt, seq=""):
    '''This uses some of the more obscure capabilities of regular expressions,
    see https://docs.python.org/3/library/re.html
    '''
    global logentries
    global logdataissues

    # extract front material and stash for later use when rebuilding from list of entries
    headmatch = re.match(r"(?i)(?s).*<body[^>]*>(.*?)<hr.*", txt)
    headpara = headmatch.groups()[0].strip()
    
    # print(f" - headpara:\n'{headpara}'")
    if(len(headpara)>0):
        frontpath = Path(settings.EXPOWEB, "years", year, "frontmatter.html")
        with open(frontpath,"w") as front:
            front.write(headpara+"\n")
    
    tripparas = re.findall(r"<hr\s*/>([\s\S]*?)(?=<hr)", txt)
    logbook_entry_count = 0
    for trippara in tripparas:
        logbook_entry_count += 1
        tid = set_trip_id(year,logbook_entry_count)
        # print(f' - new tid:{tid} lbe count: {logbook_entry_count}')
       
        s = re.match(r'''(?x)(?:\s*<div\sclass="tripdate"\sid=".*?">.*?</div>\s*<p>)?  # second date
                            \s*(?:<a\s+id="(.*?)"\s*/>\s*</a>)?
                            \s*<div\s+class="tripdate"\s*(?:id="(.*?)")?>(.*?)</div>(?:<p>)?
                            \s*<div\s+class="trippeople">\s*(.*?)</div>
                            \s*<div\s+class="triptitle">\s*(.*?)</div>
                            ([\s\S]*?)
                            \s*(?:<div\s+class="timeug">\s*(.*?)</div>)?
                            \s*$
                     ''', trippara)
        if s:
            tripid, tripid1, tripdate, trippeople, triptitle, triptext, tu = s.groups()
        else: # allow title and people to be swapped in order
            msg = f" !- {year} Can't parse:{logbook_entry_count} '{trippara[:50]}'..."
            print(msg)
            DataIssue.objects.create(parser='logbooks', message=msg)
            logdataissues[tid]=msg

            s2 = re.match(r'''(?x)(?:\s*<div\sclass="tripdate"\sid=".*?">.*?</div>\s*<p>)?  # second date
                                \s*(?:<a\s+id="(.*?)"\s*/>\s*</a>)?
                                \s*<div\s+class="tripdate"\s*(?:id="(.*?)")?>(.*?)</div>(?:<p>)?
                                \s*<div\s+class="triptitle">\s*(.*?)</div>
                                \s*<div\s+class="trippeople">\s*(.*?)</div>
                                ([\s\S]*?)
                                \s*(?:<div\s+class="timeug">\s*(.*?)</div>)?
                                \s*$
                         ''', trippara)
            if s2:
                tripid, tripid1, tripdate, triptitle, trippeople, triptext, tu = s2.groups()
            else:
                # if not re.search(r"Rigging Guide", trippara):
                msg = f" !- Logbook. Can't parse entry on 2nd pass:{logbook_entry_count} '{trippara[:50]}'..."
                print(msg)
                DataIssue.objects.create(parser='logbooks', message=msg)
                logdataissues[tid]=msg
                continue
        
        ldate = ParseDate(tripdate.strip(), year)
        triptitles = triptitle.split(" - ")
        if len(triptitles) >= 2:
            tripcave = triptitles[0]
        else:
            tripcave = "UNKNOWN"
        ltriptext = re.sub(r"</p>", "", triptext)
        #ltriptext = re.sub(r"\s*?\n\s*", " ", ltriptext)
        ltriptext = re.sub(r"<p>", "<br /><br />", ltriptext).strip()
        
        triptitle = triptitle.strip()
        entrytuple = (ldate, tripcave, triptitle, ltriptext, 
                trippeople, expedition, tu, tripid1)
        logentries.append(entrytuple)


# main parser for 1991 - 2001.  simpler because the data has been hacked so much to fit it
# trying it out for years 1982 - 1990 too. Some logbook editing required by hand.. place
def parser_html_01(year, expedition, txt, seq=""):
    '''This uses some of the more obscure capabilities of regular expressions,
    see https://docs.python.org/3/library/re.html
    '''
    global logentries
    global logdataissues
    errorcount = 0
    
    # extract front material and stash for later use when rebuilding from list of entries
    headmatch = re.match(r"(?i)(?s).*<body[^>]*>(.*?)<hr.*", txt)
    headpara = headmatch.groups()[0].strip()
    
    # print(f" - headpara:\n'{headpara}'")
    if(len(headpara)>0):
        frontpath = Path(settings.EXPOWEB, "years", year, "frontmatter.html")
        with open(frontpath,"w") as front:
            front.write(headpara+"\n")
    
    tripparas = re.findall(r"<hr[\s/]*>([\s\S]*?)(?=<hr)", txt)
    logbook_entry_count = 0
    for trippara in tripparas:
        logbook_entry_count += 1
        tid = set_trip_id(year,logbook_entry_count)
        # print(f" #0 - tid: {tid}")
        try:
            #print(f" #1 - tid: {tid}")
            s = re.match(r"(?i)(?s)\s*(?:<p>)?(.*?)</?p>(.*)$", trippara)
            if not s:
                message = " ! - Skipping logentry {year} failure to parse header: " + tid + trippara[:300] + "..."
                DataIssue.objects.create(parser='logbooks', message=message)
                logdataissues[tid]=message
                print(message)
                break
            try:
                tripheader, triptext = s.group(1), s.group(2)
            except:
                message = f" ! - Fail to set tripheader, triptext. trip:<{tid}> s:'{s}'" 
                DataIssue.objects.create(parser='logbooks', message=message)
                logdataissues[tid]=message
                print(message)
                

            # mtripid = re.search(r'<a id="(.*?)"', tripheader)
            # if not mtripid:
                # message = f" ! - A tag id not found. Never mind. Not needed. trip:<{tid}> header:'{tripheader}'" 
                # DataIssue.objects.create(parser='logbooks', message=message)
                # logdataissues[tid]=message
                # print(message)
                
            # tripid = mtripid and mtripid.group(1) or ""
            # print(f" # - mtripid: {mtripid}")
            tripheader = re.sub(r"</?(?:[ab]|span)[^>]*>", "", tripheader)
            #print(f" #2 - tid: {tid}")
            try:
                tripdate, triptitle, trippeople = tripheader.split("|")
            except:
                message = f" ! - Fail 3 to split out date|title|people. trip:<{tid}> '{tripheader.split('|')}'" 
                DataIssue.objects.create(parser='logbooks', message=message)
                logdataissues[tid]=message
                print(message)
                try:
                    tripdate, triptitle = tripheader.split("|")
                    trippeople = "GUESS ANON"
                except:
                    message = f" ! - Skipping logentry {year} Fail 2 to split out date|title (anon). trip:<{tid}> '{tripheader.split('|')}' CRASHES MySQL !" 
                    DataIssue.objects.create(parser='logbooks', message=message)
                    logdataissues[tid]=message
                    print(message)
                    break
            #print(f" #3 - tid: {tid}")
            triptitle = triptitle.strip()
            ldate = ParseDate(tripdate.strip(), year)
            #print(f" # -             tid: {tid} <{tripdate}> <{triptitle}> <{trippeople}>")
            #print(f" #4 - tid: {tid}")

            mtu = re.search(r'<p[^>]*>(T/?U.*)', triptext)
            if mtu:
                tu = mtu.group(1)
                triptext = triptext[:mtu.start(0)] + triptext[mtu.end():]
            else:
                tu = ""

            triptitles = triptitle.split(" - ")
            tripcave = triptitles[0].strip()

            ltriptext = triptext
            
            mtail = re.search(r'(?:<a href="[^"]*">[^<]*</a>|\s|/|-|&amp;|</?p>|\((?:same day|\d+)\))*$', ltriptext)
            if mtail:
                ltriptext = ltriptext[:mtail.start(0)]
            ltriptext = re.sub(r"</p>", "", ltriptext)
            ltriptext = re.sub(r"\s*?\n\s*", " ", ltriptext)
            ltriptext = re.sub(r"</?u>", "_", ltriptext)
            ltriptext = re.sub(r"</?i>", "''", ltriptext)
            ltriptext = re.sub(r"</?b>", "'''", ltriptext)
            ltriptext = re.sub(r"<p>", "<br /><br />", ltriptext).strip()
           
            if ltriptext == "":
                message = " ! - Zero content for logbook entry!: " + tid 
                DataIssue.objects.create(parser='logbooks', message=message)
                logdataissues[tid]=message
                print(message)
                

            entrytuple = (ldate, tripcave, triptitle, ltriptext, 
                    trippeople, expedition, tu, tid)
            logentries.append(entrytuple)
                
        except:
            message = f" ! - Skipping logentry {year} due to exception in: {tid}"
            DataIssue.objects.create(parser='logbooks', message=message)
            logdataissues[tid]=message
            print(message)
            errorcount += 1
            raise
            if errorcount >5 :
                message = f" !!- TOO MANY ERRORS - aborting at '{tid}' logbook: {year}"
                DataIssue.objects.create(parser='logbooks', message=message)
                logdataissues[tid]=message
                print(message)
                return

def parser_blog(year, expedition, txt, sq=""):
    '''Parses the format of web pages collected as 'Save As HTML" from the UK Caving blog website.
    Note that the entries have dates and authors, but no titles.
    See detailed explanation of the complete process:
    https://expo.survex.com/handbook/computing/logbooks-parsing.html
    https://expo.survex.com/handbook/computing/log-blog-parsing.html
    
    This uses some of the more obscure capabilities of regular expressions,
    see https://docs.python.org/3/library/re.html
    
    BLOG entries have this structure:
        <article ... data-author="Tinywoman" data-content="post-298780" id="js-post-298780">
            <article class="message-body js-selectToQuote">
            </article>
        </article>    
    So the content is nested inside the header. Attachments (images) come after the content.
    '''
    global logentries
    global logdataissues
    errorcount = 0

    tripheads = re.findall(r"<article class=\"message message--post js-post js-inlineModContainer\s*\"\s*([\s\S]*?)(?=</article)", txt)
    if not ( tripheads ) :
        message = f" ! - Skipping on failure to parse article header: {txt[:500]}"
        print(message)

    # (?= is a non-consuming match, see https://docs.python.org/3/library/re.html
    tripparas = re.findall(r"<article class=\"message-body js-selectToQuote\"\>\s*([\s\S]*?)(</article[^>]*>)([\s\S]*?)(?=</article)", txt)
    if not ( tripparas ) :
        message = f" ! - Skipping on failure to parse article content: {txt[:500]}"
        print(message)
        
    if (len(tripheads) !=len(tripparas)):
        print(f"{len(tripheads)} != {len(tripparas)}")
    print(f"{len(tripheads)} - {len(tripparas)}")

    location = "Plateau" # best guess, fix manually later
    tu = 0
    logbook_entry_count = 0
    for i in range(0, len(tripparas)):
        tripstuff = tripparas[i]
        attach = tripstuff[2]
        # note use on non-greedy *? regex idiom here
        attach = re.sub(r"<div class=\"file-content\">[\s\S]*?(?=</li>)","",attach)
        attach = re.sub(r"<footer[\s\S]*(</footer>)","",attach)
        tripcontent = tripstuff[0] + attach
        #print(f"{i} - {len(tripstuff)} - {tripstuff[1]}")
        triphead = tripheads[i]
        logbook_entry_count += 1
        tid = set_trip_id(year,logbook_entry_count) +"_blog" + sq
        # print(f" -  tid: {tid}")
        
        # data-author="tcacrossley"
        match_author = re.search(r".*data-author=\"([^\"]*)\" data-content=.*", triphead)
        if not ( match_author ) :
            message = f" ! - Skipping logentry {year}:{logbook_entry_count} on failure to parse data-author  {tid} {triphead[:400]}..."
            DataIssue.objects.create(parser='logbooks', message=message)
            logdataissues[tid]=message
            print(message)
            break
        trippeople = match_author.group(1)
        # print(f" -  tid: {tid} {trippeople}")
        # datetime="2019-07-11T13:16:18+0100"
        match_datetime = re.search(r".*datetime=\"([^\"]*)\" data-time=.*", triphead)
        if not ( match_datetime ) :
            message = f" ! - Skipping logentry {year}:{logbook_entry_count} on failure to parse datetime  {tid} {triphead[:400]}..."
            DataIssue.objects.create(parser='logbooks', message=message)
            logdataissues[tid]=message
            print(message)
            break
        datestamp = match_datetime.group(1)
        
        try:
            tripdate = datetime.fromisoformat(datestamp)
        except:
            message = f" ! - FROMISOFORMAT fail logentry {year}:{logbook_entry_count} {tid} '{datestamp}'"
            DataIssue.objects.create(parser='logbooks', message=message)
            logdataissues[tid]=message
            print(message)
            # fallback, ignore the timestamp bits:
            tripdate = datetime.fromisoformat(datestamp[0:10])
        # print(f" -  tid: {tid} '{trippeople}' '{tripdate}'")
        
        # tripname must have the location then a hyphen at the beginning as it is ignored by export function
        location = "Unknown"
        tripname = f"Expo - UK Caving Blog{sq} post {logbook_entry_count}" # must be unique for a given date
        tripcontent = re.sub(r"(width=\"\d+\")","",tripcontent)
        tripcontent = re.sub(r"height=\"\d+\"","",tripcontent)
        tripcontent = re.sub(r"width: \d+px","",tripcontent)
        tripcontent = re.sub(r"\n\n+","\n\n",tripcontent)
        tripcontent = re.sub(r"<hr\s*>","",tripcontent)
        tripcontent =  f"\n\n<!-- Content parsed from UK Caving Blog -->\nBlog Author: {trippeople}" + tripcontent

        entrytuple = (tripdate, location, tripname, tripcontent, 
            trippeople, expedition, tu, tid)
        logentries.append(entrytuple)

    
def LoadLogbookForExpedition(expedition, clean=True):
    """ Parses all logbook entries for one expedition 
    if clean==True then it deletes all entries for this year first.
    """
    global logentries
    # absolutely horrid. REFACTOR THIS (all my fault..)
    global logdataissues
    global entries

    logbook_parseable = False
    yearlinks   = LOGBOOK_PARSER_SETTINGS
    expologbase = os.path.join(settings.EXPOWEB, "years")
    logentries=[]
    
    year = expedition.year
    expect = entries[year]
    # print(" - Logbook for: " + year)

    
    
    def cleanerrors(year):
        global logdataissues
        dataissues = DataIssue.objects.filter(parser='logbooks')
        for di in dataissues:
            ph = year
            if re.search(ph, di.message) is not None:
                #print(f'   - CLEANING dataissue {di.message}')
                di.delete()
     
        #print(f'   - CLEAN {year} {len(logdataissues)} {type(logdataissues)} data issues for this year')
        dellist = []
        for key, value in logdataissues.items():
            #print(f'   - CLEANING logdataissues [{key}]: {value}')
            if key.startswith(year):
                #print(f'   - CLEANING logdataissues [{key:12}]: {value} ')
                dellist.append(key)
        for i in dellist:
            del logdataissues[i]
    if (clean):
        cleanerrors(year)

    if year in yearlinks:
        yearfile, yearparser = yearlinks[year]
        logbookpath =  Path(yearfile)
        expedition.logbookfile = yearfile 
        parsefunc   = yearparser
        # print(f" - Logbook file {yearfile} using parser {yearparser}")

    else:
        logbookpath = Path(DEFAULT_LOGBOOK_FILE)
        expedition.logbookfile = DEFAULT_LOGBOOK_FILE
        parsefunc   = DEFAULT_LOGBOOK_PARSER

    expedition.save()
    
    lbes = LogbookEntry.objects.filter(expedition=expedition)
    if (clean):
        for lbe in lbes:
            lbe.delete()

    for sq in ["", "2", "3", "4"]: # cope with blog saved as many separate files
        lb = Path(expologbase,  year, logbookpath.stem + sq + logbookpath.suffix)
        if not (lb.is_file()):
            # print(f"   ! End of blog. Next blog file in sequence not there:{lb}")
            break
        try:
            with open(lb,'rb') as file_in:
                txt = file_in.read().decode("utf-8")
            logbook_parseable = True
        except (IOError):
            logbook_parseable = False
            print(f"   ! Couldn't open logbook as UTF-8 {lb}")
        except:
            logbook_parseable = False
            print(f"   ! Very Bad Error opening {lb}")

        if logbook_parseable:
            
            # --------------------
            parser = globals()[parsefunc]
            print(f' - {year} parsing with {parsefunc} - {lb}')
            parser(year, expedition, txt, sq) # this launches the right parser for this year
            # --------------------
        dupl = {}
        for entrytuple in logentries:
            date, tripcave, triptitle, text, trippeople, expedition, logtime_underground, tripid1 = entrytuple
            check = (date, triptitle)
            if check in dupl:
                dupl[check] += 1
                triptitle = f"{triptitle} #{dupl[check]}"
                print(f'  - {triptitle} -- {date}')
            else:
                dupl[check] = 1
            EnterLogIntoDbase(date, tripcave, triptitle, text, trippeople, expedition, logtime_underground,
                    tripid1)
    
    if len(logentries) == expect:
        # print(f"OK  {year} {len(logentries):5d} is {expect}\n")
        pass
    else:
        print(f"Mismatch in number of log entries: {year} {len(logentries):5d} is not {expect}\n")

    return len(logentries)

def LoadLogbook(year):
    '''One off logbook for testing purposes
    '''
    global LOGBOOK_PARSER_SETTINGS
     
    nlbe={}
    TROG['pagecache']['expedition'][year] = None # clear cache
    
    expo = Expedition.objects.get(year=year)   
    year = expo.year # some type funny
    nlbe[expo] = LoadLogbookForExpedition(expo)  # this actually loads the logbook for one expo
    if year in BLOG_PARSER_SETTINGS:
        print("BLOG parsing")
        LOGBOOK_PARSER_SETTINGS[year] = BLOG_PARSER_SETTINGS[year] 
        nlbe[expo] = LoadLogbookForExpedition(expo, clean=False)  # this  loads the blog logbook for one expo
    else:
        print(f"Not a year with extant blog entries to import: '{year}' not in BLOG_PARSER_SETTINGS {BLOG_PARSER_SETTINGS}")

def LoadLogbooks():
    """ This is the master function for parsing all logbooks into the Troggle database. 
    This should be rewritten to use coroutines to load all logbooks from disc in parallel,
    but must be serialised to write to database as sqlite is single-user.
    """
    global logdataissues
    global entries

    logdataissues = {}
    DataIssue.objects.filter(parser='logbooks').delete()
    expos = Expedition.objects.all()
    if len(expos) <= 1:
        message = f" ! - No expeditions found. Load 'people' first" 
        DataIssue.objects.create(parser='logbooks', message=message)
        logdataissues[f"sqlfail 0000"]=message
        print(message)
        return

    noexpo =      ["1986", "2020", "2021",] #no expo
    lostlogbook = ["1976", "1977", "1978", "1979", "1980", "1981"]
    sqlfail =     ["1987", "1988", "1989"] # breaks mysql with db constraint fail - debug locally first]
    nologbook = noexpo + lostlogbook + sqlfail

    nlbe={}
    expd ={}
    loglist = []
    bloglist = []
    
    for expo in expos: # pointless as we explicitly know the years in this code.
        year = expo.year
        TROG['pagecache']['expedition'][year] = None # clear cache
        if year in sqlfail:
            print(" - Logbook for: " + year + " NO parsing attempted - known sql failures")
            message = f" ! - Not even attempting to parse logbook for {year} until code fixed" 
            DataIssue.objects.create(parser='logbooks', message=message)
            logdataissues[f"sqlfail {year}"]=message
            print(message)

        if year not in nologbook:
            if year in entries:
                loglist.append(expo)
            else:
                print(" - No Logbook yet for: " + year) # catch case when preparing for next expo
                
        if year in BLOG_PARSER_SETTINGS:
            bloglist.append(expo)

 
    for ex in loglist:
        nlbe[ex] = LoadLogbookForExpedition(ex)  # this  loads the logbook for one expo

    for b in bloglist:
        if str(b) in LOGBOOK_PARSER_SETTINGS:
            orig = LOGBOOK_PARSER_SETTINGS[str(b)]
        else:
            orig = (DEFAULT_LOGBOOK_FILE, DEFAULT_LOGBOOK_PARSER)
        LOGBOOK_PARSER_SETTINGS[str(b)] = BLOG_PARSER_SETTINGS[str(b)] 
        print(f" - BLOG: {b}") 
        nlbe[b] = LoadLogbookForExpedition(b, clean=False)  # this  loads the blog logbook for one expo
        LOGBOOK_PARSER_SETTINGS[str(b)] = orig

    # tried to use map with concurrent threads - but sqlite database is not concurrent, so failed with database lock
    # yt = 0
    # for r in map(LoadLogbookForExpedition, loglist): 
        # yt = r

    yt = 0
    for e in nlbe:
        yt += nlbe[e]
    print(f"total {yt:,} log entries parsed in all expeditions")



# dateRegex = re.compile(r'<span\s+class="date">(\d\d\d\d)-(\d\d)-(\d\d)</span>', re.S)
# expeditionYearRegex = re.compile(r'<span\s+class="expeditionyear">(.*?)</span>', re.S)
# titleRegex = re.compile(r'<H1>(.*?)</H1>', re.S)
# reportRegex = re.compile(r'<div\s+class="report">(.*)</div>\s*</body>', re.S)
# personRegex = re.compile(r'<div\s+class="person">(.*?)</div>', re.S)
# nameAuthorRegex = re.compile(r'<span\s+class="name(,author|)">(.*?)</span>', re.S)
# TURegex = re.compile(r'<span\s+class="TU">([0-9]*\.?[0-9]+)</span>', re.S)
# locationRegex = re.compile(r'<span\s+class="location">(.*?)</span>', re.S)
# caveRegex = re.compile(r'<span\s+class="cave">(.*?)</span>', re.S)