import os
import re
import subprocess
from pathlib import Path

from django import forms
from django.conf import settings
from django.core.files.storage import FileSystemStorage, default_storage
from django.db.models import Q
from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import render
from django.template import Context, loader
from django.urls import reverse

from troggle.core.models.caves import QM, Cave, LogbookEntry, PersonTrip
from troggle.core.models.survex import DrawingFile
# from databaseReset import reinit_db # don't do this. databaseRest runs code *at import time*
from troggle.core.models.troggle import Expedition, Person, PersonExpedition
from troggle.parsers.imports import (import_caves, import_drawingsfiles,
                                     import_logbooks, import_people,
                                     import_QMs, import_survex,
                                     import_surveyscans)

from .auth import login_required_if_public

'''Utility functions and code to serve the control panel and individual user's 
progress and task list (deprecated as we do not have individual user login).
'''

todo = '''

- Use logbookdownloader to convert all older logbooks into the 2005-variant of HTML then we can 
    get rid of the parsers for older formats. 
    When we have done all the old logbooks, delete this function and the two templates.
    
    OR invent a new format, e.g. using <article> and <section>?, which is better!
'''

def todos(request, module): 
    '''produces todo text from module
    We could automate this to find all those strings automatically
    '''
    from troggle.core.forms import todo as forms
    from troggle.core.middleware import todo as middleware
    from troggle.core.models.caves import todo as modelcaves
    from troggle.core.TESTS.tests import todo as tests
    from troggle.core.views.caves import todo as viewcaves
    from troggle.core.views.drawings import todo as viewdrawings
    from troggle.core.views.logbooks import todo as viewlogbooks
    from troggle.core.views.survex import todo as viewsurvex
    from troggle.parsers.caves import todo as parserscaves
    from troggle.parsers.drawings import todo as parsersdrawings
    from troggle.parsers.logbooks import todo as parserslogbooks
    from troggle.parsers.survex import todo as parserssurvex
    tododict = {'views/other': todo,
        'tests': tests, 
        'views/logbooks': viewlogbooks, 
        'views/survex': viewsurvex, 
        'views/caves': viewcaves, 
        'views/drawings': viewdrawings, 
        'parsers/caves': parserscaves, 
        'parsers/logbooks': parserslogbooks, 
        'parsers/drawings': parsersdrawings, 
        'parsers/survex': parserssurvex, 
        'core/models/caves': modelcaves,
        'core/middleware': middleware,
        'core/forms': forms}
    return render(request,'core/todos.html', {'tododict': tododict})

def troggle404(request): # cannot get this to work. Handler404 in urls.py not right syntax
    '''Custom 404 page to be used even when Debug=True
    https://blog.juanwolf.fr/posts/programming/how-to-create-404-page-django/
    '''
    context = RequestContext(request)
    #context['caves'] = Cave.objects.all()
    return render(request, ('errors/generic.html', context.flatten()))

def frontpage(request): 
    '''never seen in common practice. Logon should redirect here when this is more useful'''
    # the messages system does a popup on this page if there is a recent message, e.g. from the admin site actions.
    # via django.contrib.messages.middleware.MessageMiddleware 
    # this is set in the templates.
    if request.user.is_authenticated:
        return render(request,'tasks.html')

    expeditions =  Expedition.objects.order_by("-year")
    logbookentry = LogbookEntry
    cave = Cave
    #from django.contrib.admin.templatetags import log
    return render(request,'frontpage.html', locals())


@login_required_if_public
def controlpanel(request):
    '''Admin requires expoadmin user logged on
    Mostly disabled apart from logbook export
    DANGEROUS, these import functions kill the ground under your feet !
    '''
    jobs_completed=[]
    
    def process_imports():
        '''databaseReset.py
            jq.enq("reinit",reinit_db)
            jq.enq("caves",import_caves)
            jq.enq("people",import_people)
            jq.enq("scans",import_surveyscans)
            jq.enq("logbooks",import_logbooks)
            jq.enq("QMs",import_QMs)
            jq.enq("drawings",import_drawingsfiles)
            jq.enq("survex",import_survex)
        '''
        if request.POST.get("import_caves", False):
            import_caves()
            jobs_completed.append('Caves')
        if request.POST.get("import_people", False):
            import_people()
            jobs_completed.append('People')
        if request.POST.get("import_surveyscans", False):
            import_surveyscans()
            jobs_completed.append('Scans')
        if request.POST.get("import_logbooks", False):
            import_logbooks()
            jobs_completed.append('Logbooks')
        if request.POST.get("import_QMs", False):
            import_QMs()
            jobs_completed.append('QMs')
        if request.POST.get("import_drawingsfiles", False):
            import_drawingsfiles()
            jobs_completed.append('Drawings')
        if request.POST.get("import_survex", False):
            import_survex()
            jobs_completed.append('Survex')
            
        print("", flush=True)

    if not request.user.is_superuser: # expoadmin is both .is_staff and ._is_superuser
        return render(request,'controlPanel.html', {'error': 'You are logged in, but not logged in as "expoadmin". \nLogout and login again to contnue.'})
    else:
        if request.method=='POST':
            #reinit_db()
            process_imports()
            return render(request,'controlPanel.html', {'expeditions':Expedition.objects.all(),'jobs_completed':jobs_completed})
        else:
            return render(request,'controlPanel.html', {'expeditions':Expedition.objects.all(),'jobs_completed':jobs_completed})



def exportlogbook(request,year=None,extension=None):
    '''Constructs, from the database, a complete HTML formatted logbook 
    for the current year. Formats available are HTML2005 (others old & broken or not written yet)
    
    There are no images stored in the database, so this is only a tool for a first pass, to be followed by
     hand-editing. However links to images work in the HTML text of a logbook entry
    
    NEED TO ADD IN THE MATERIAL WHICH IS NOT IN ANY LBE ! e.g. front matter.   
    
    This function is the recipient of the POST action os the export form in the control panel
    '''
    def lbeKey(lbe):
        """This function goes into a lexicogrpahic sort function
        """ 
        return str(lbe.date)

    if not request.method=='POST':
        return render(request,'controlPanel.html', {'expeditions':Expedition.objects.all(),'jobs_completed':""})
    else:
        print(f'Logbook export {request.POST}')

        year =  request.POST['year'] 
        current_expedition=Expedition.objects.get(year=year)
        logbook_entries=LogbookEntry.objects.filter(expedition=current_expedition).order_by('date') # need to be sorted by date!
        
        print(f'Logbook has {len(logbook_entries)} entries in it.')

        extension ='html'
        response = HttpResponse(content_type='text/html')
        style='2005'
            
        filename='logbook-new-format.' + extension
        template='logbook'+style+'style.'+ extension
        response['Content-Disposition'] = 'attachment; filename='+filename
        t=loader.get_template(template)
        logbookfile = (t.render({'logbook_entries':logbook_entries}))

        endpath = Path(settings.EXPOWEB, "years", year, "endmatter.html")
        endmatter = ""
        if endpath.is_file():         
            try:
                with open(endpath,"r") as end:
                    endmatter = end.read()                    
            except:
                print("   ! Very Bad Error opening " + endpath)

        frontpath = Path(settings.EXPOWEB, "years", year, "frontmatter.html")
        if frontpath.is_file():         
            try:
                with open(frontpath,"r") as front:
                    frontmatter = front.read()                    
            except:
                print("   ! Very Bad Error opening " + frontpath)
            logbookfile = re.sub(r"<body>", "<body>\n"+frontmatter+endmatter , logbookfile)     
        else:
            logbookfile = re.sub(r"<body>", f"<body>\n<h1>Expo {year}</h1>\n"+endmatter, logbookfile)     


        dir = Path(settings.EXPOWEB) / "years" / year
        filepath = Path(dir, filename)
        with(open(filepath, 'w')) as lb:
            lb.writelines(logbookfile)

        #print(f'Logbook exported to {filepath}')
        completed = f'Logbook exported to <a href="/years/{filename}">{filename}</a>'

        return render(request,'controlPanel.html', {'expeditions':Expedition.objects.all(),'jobs_completed':[completed]})