troggle/core/views/caves.py

import os
import re
import subprocess
from pathlib import Path

from django.core.exceptions import MultipleObjectsReturned, ObjectDoesNotExist
from django.http import HttpResponse, HttpResponseNotFound, HttpResponseRedirect
from django.shortcuts import render
from django.urls import NoReverseMatch

import troggle.settings as settings
from troggle.core.forms import CaveAndEntranceFormSet, CaveForm, EntranceForm, EntranceLetterForm
from troggle.core.models.caves import Cave, CaveAndEntrance, Entrance, GetCaveLookup 
from troggle.core.models.logbooks import CaveSlug, QM
from troggle.core.utils import write_and_commit
from troggle.core.views import expo
from troggle.settings import CAVEDESCRIPTIONS, ENTRANCEDESCRIPTIONS
from troggle.parsers.caves import read_cave, read_entrance


from .auth import login_required_if_public

"""Manages the complex procedures to assemble a cave description out of the compnoents
Manages the use of cavern to parse survex files to produce 3d and pos files
"""

todo = """
- Fix rendercave() so that CaveView works

- in getCaves() search GCavelookup first, which should raise a MultpleObjectsReturned 
  exception if no duplicates
  
- Learn to use Django .select_related() and .prefetch_related() to speed things up
  especially on the big report pages 
  https://zerotobyte.com/how-to-use-django-select-related-and-prefetch-related/
"""


def getCaves(cave_id):
    """Only gets called if a call to getCave() raises a MultipleObjects exception

    TO DO: search GCavelookup first, which should raise a MultpleObjectsReturned exception if there
    are duplicates"""
    try:
        caves = Cave.objects.filter(kataster_number=cave_id)
        caveset = set(caves)

        Gcavelookup = GetCaveLookup()  # dictionary makes strings to Cave objects
        if cave_id in Gcavelookup:
            caveset.add(Gcavelookup[cave_id])
        return list(caveset)
    except:
        return []


def getCave(cave_id):
    """Returns a cave object when given a cave name or number. It is used by views including cavehref, ent, and qm.

    TO DO: search GCavelookup first, which should raise a MultpleObjectsReturned exception if there
    are duplicates"""
    try:
        cave = Cave.objects.get(kataster_number=cave_id)
        return cave
    except Cave.MultipleObjectsReturned as ex:
        raise MultipleObjectsReturned("Duplicate kataster number") from ex  # propagate this up

    except Cave.DoesNotExist as ex:
        Gcavelookup = GetCaveLookup()  # dictionary makes strings to Cave objects
        if cave_id in Gcavelookup:
            return Gcavelookup[cave_id]
        else:
            raise ObjectDoesNotExist("No cave found with this identifier in any id field") from ex  # propagate this up
    except:
        raise ObjectDoesNotExist("No cave found with this identifier in any id field")


def pad5(x):
    return "0" * (5 - len(x.group(0))) + x.group(0)


def padnumber(x):
    return re.sub("\d+", pad5, x)


def numericalcmp(x, y):
    return cmp(padnumber(x), padnumber(y))


def caveKey(c):
    """This function goes into a lexicogrpahic sort function, and the values are strings,
    but we want to sort numberically on kataster number before sorting on unofficial number.
    """
    if not c.kataster_number:
        return "9999." + c.unofficial_number
    else:
        if int(c.kataster_number) >= 100:
            return "99." + c.kataster_number
        if int(c.kataster_number) >= 10:
            return "9." + c.kataster_number
        return c.kataster_number


def getnotablecaves():
    notablecaves = []
    for kataster_number in settings.NOTABLECAVESHREFS:
        try:
            cave = Cave.objects.get(kataster_number=kataster_number)
            notablecaves.append(cave)
        except:
            # print(" ! FAILED to get only one cave per kataster_number OR invalid number for: "+kataster_number)
            caves = Cave.objects.all().filter(kataster_number=kataster_number)
            for c in caves:
                # print(c.kataster_number, c.slug())
                if c.slug() is not None:
                    notablecaves.append(c)
    return notablecaves


def caveindex(request):
    Cave.objects.all()
    caves1623 = list(Cave.objects.filter(area__short_name="1623"))
    caves1626 = list(Cave.objects.filter(area__short_name="1626"))
    caves1623.sort(key=caveKey)
    caves1626.sort(key=caveKey)
    return render(
        request,
        "caveindex.html",
        {"caves1623": caves1623, "caves1626": caves1626, "notablecaves": getnotablecaves(), "cavepage": True},
    )


def cave3d(request, cave_id=""):
    """This is used to create a download url in templates/cave.html if anyone wants to download the .3d file
    The caller template tries kataster first, then unofficial_number if that kataster number does not exist
    but only if Cave.survex_file is non-empty

    But the template file cave.html has its own ideas about the name of the file and thus the href. Ouch.
    /cave/3d/<cave_id>
    """
    try:
        cave = getCave(cave_id)
    except ObjectDoesNotExist:
        return HttpResponseNotFound
    except Cave.MultipleObjectsReturned:
        # But only one might have survex data? So scan and return the first that works.
        caves = getCaves(cave_id)
        for c in caves:
            if c.survex_file:
                # exists, but may not be a valid file path to a valid .svx file in the Loser repo
                return file3d(request, c, c.slug)
    else:
        return file3d(request, cave, cave_id)


def file3d(request, cave, cave_id):
    """Produces a .3d file directly for download.
    survex_file should be in valid path format 'caves-1623/264/264.svx' but it might be mis-entered as simply '2012-ns-10.svx'

    Also the cave.survex_file may well not match the cave description path:
    e.g. it might be to the whole system 'smk-system.svx' instead of just for the specific cave.

    - If the expected .3d file corresponding to cave.survex_file is present, return it.
    - If the cave.survex_file exists, generate the 3d file, cache it and return it
    - Use the cave_id to guess what the 3d file might be and, if in the cache, return it
    - Use the cave_id to guess what the .svx file might be and generate the .3d file and return it
    - (Use the incomplete cave.survex_file and a guess at the missing directories to guess the real .svx file location ?)
    """

    def runcavern(survexpath):
        """This has not yet been properly updated with respect to putting the .3d file in the same folder as the .svx filse
        as done in runcavern3d() in parsers/survex.py
        Needs testing.
        """
        # print(" -  Regenerating cavern .log and .3d for '{}'".format(survexpath))
        if not survexpath.is_file():
            # print(" -  - Regeneration ABORT\n -  - from '{}'".format(survexpath))
            pass
        try:
            completed_process = subprocess.run(
                [settings.CAVERN, "--log", f"--output={settings.SURVEX_DATA}", f"{survexpath}"]
            )
        except OSError as ex:
            # propagate this to caller.
            raise OSError(completed_process.stdout) from ex

        op3d = (Path(settings.SURVEX_DATA) / Path(survexpath).name).with_suffix(".3d")
        op3dlog = Path(op3d.with_suffix(".log"))

        if not op3d.is_file():
            print(f" -  - Regeneration FAILED\n -  - from '{survexpath}'\n -  - to   '{op3d}'")
            print(" -  - Regeneration stdout: ", completed_process.stdout)
            print(" -  - Regeneration cavern log output: ", op3dlog.read_text())

    def return3d(threedpath):
        if threedpath.is_file():
            response = HttpResponse(content=open(threedpath, "rb"), content_type="application/3d")
            response["Content-Disposition"] = f"attachment; filename={threedpath.name}"
            return response
        else:
            message = f'<h1>Path provided  does not correspond to any actual 3d file.</h1><p>path: "{threedpath}"'
            # print(message)
            return HttpResponseNotFound(message)

    survexname = Path(cave.survex_file).name  # removes directories
    survexpath = Path(settings.SURVEX_DATA, cave.survex_file)
    threedname = Path(survexname).with_suffix(".3d")  # removes .svx, replaces with .3d
    threedpath = Path(settings.SURVEX_DATA, threedname)

    # These if statements need refactoring more cleanly
    if cave.survex_file:
        # print(" -  cave.survex_file '{}'".format(cave.survex_file))
        if threedpath.is_file():
            # print(" -  threedpath '{}'".format(threedpath))
            # possible error here as several .svx files of same names in different directories will overwrite in /3d/
            if survexpath.is_file():
                if os.path.getmtime(survexpath) > os.path.getmtime(threedpath):
                    runcavern(survexpath)
            return return3d(threedpath)
        else:
            # print(" -  - survexpath '{}'".format(survexpath))
            if survexpath.is_file():
                # print(" -  -  - survexpath '{}'".format(survexpath))
                runcavern(survexpath)
                return return3d(threedpath)

    # Get here if cave.survex_file was set but did not correspond to a valid svx file
    if survexpath.is_file():
        # a file, but invalid format
        message = f'<h1>File is not valid .svx format.</h1><p>Could not generate 3d file from "{survexpath}"'
    else:
        # we could try to guess that 'caves-1623/' is missing,... nah.
        message = f'<h1>Path provided  does not correspond to any actual file.</h1><p>path: "{survexpath}"'

    return HttpResponseNotFound(message)


def rendercave(request, cave, slug, cave_id=""):
    """Gets the data and files ready and then triggers Django to render the template.
    The resulting html contains urls which are dispatched independently, e.g. the 'download' link
    """
    # print(" ! rendercave:'{}' START slug:'{}' cave_id:'{}'".format(cave, slug, cave_id))

    if cave.non_public and settings.PUBLIC_SITE and not request.user.is_authenticated:
        return render(request, "nonpublic.html", {"instance": cave, "cavepage": True, "cave_id": cave_id})
    else:
        # print(f" ! rendercave: slug:'{slug}' survex file:'{cave.survex_file}'")
        try:
            svx3d = Path(cave.survex_file).stem
            svxstem = Path(settings.SURVEX_DATA) / Path(cave.survex_file)
            # print(f" ! rendercave: slug:'{slug}' '' ++ '{svxstem}'")
        except:
            print(f" ! rendercave: slug:'{slug}' FAIL TO MANAGE survex file:'{cave.survex_file}'")
        # NOTE the template itself loads the 3d file using javascript before it loads anything else.
        # Django cannot see what this javascript is doing, so we need to ensure that the 3d file exists first.
        # So only do this render if a valid .3d file exists. TO BE DONE -Not yet as CaveView is currently disabled
        # see design docum in troggle/templates/cave.html
        # see rendercave() in troggle/core/views/caves.py
        templatefile = "cave.html"

        if not cave_id:
            cave_id = slug  # cave.unofficial_number
        context = {
            "cave_editable": True,
            "settings": settings,
            "cave": cave,
            "cavepage": True,
            "cave_id": cave_id,
            "svxstem": str(svxstem),
            "svx3d": svx3d,
        }

        # Do not catch any exceptions here: propagate up to caller
        r = render(
            request, templatefile, context
        )  # crashes here with NoReverseMatch if url not set up for 'edit_cave' in urls.py
        return r


def cavepage(request, karea, subpath):
    """Displays a cave description page
    accessed by kataster area number specifically
    OR
    accessed by cave.url specifically set in data, e.g.
    "1623/000/000.html" <= cave-data/1623-000.html
    "1623/41/115.htm" <= cave-data/1623-115.html
    so we have to query the database to fine the URL as we cannot rely on the url actually telling us the cave by inspection.

    There are A LOT OF URLS to e.g. /1623/161/l/rl89a.htm which are IMAGES and html files
    in cave descriptions. These need to be handled HERE
    """
    kpath = karea + subpath
    # print(f" ! cavepage:'{kpath}' kataster area:'{karea}' rest of path:'{subpath}'")

    try:
        cave = Cave.objects.get(url=kpath)  # ideally this will be unique
    except Cave.DoesNotExist:
        # probably a link to text or an image e.g. 1623/161/l/rl89a.htm i.e. an expoweb page
        # cannot assume that this is a simple cave page, for a cave we don't know.
        # print(f" ! cavepage: url={kpath} A cave of this name does not exist")
        return expo.expopage(request, kpath)
    except Cave.MultipleObjectsReturned:
        caves = Cave.objects.filter(url=kpath)
        # print(f" ! cavepage: url={kpath} multiple caves exist")
        # we should have a -several variant for the cave pages, not just the svxcaves:
        return render(request, "svxcaveseveral.html", {"settings": settings, "caves": caves})

    try:
        r = rendercave(request, cave, cave.slug())
        return r
    except NoReverseMatch:
        if settings.DEBUG:
            raise
        else:
            message = f"Failed to render cave: {kpath} (it does exist and is unique) because of a Django URL resolution error. Check urls.py."
            return render(request, "errors/generic.html", {"message": message})
    except:
        # anything else is a new problem. Add in specific error messages here as we discover new types of error
        raise


def caveEntrance(request, slug):
    try:
        cave = Cave.objects.get(caveslug__slug=slug)
    except:
        return render(request, "errors/badslug.html", {"badslug": f"{slug} - from caveEntrance()"})

    if cave.non_public and settings.PUBLIC_SITE and not request.user.is_authenticated:
        return render(request, "nonpublic.html", {"instance": cave})
    else:
        return render(request, "cave_entrances.html", {"cave": cave})


@login_required_if_public
def edit_cave(request, path="", slug=None):
    """This is the form that edits all the cave data and writes out an XML file in the :expoweb: repo folder
    The format for the file being saved is in templates/dataformat/cave.xml
    Warning. This uses Django deep magic.

    It saves the data into into the database and into the html file, which it then commits to git.
    """
    message = ""
    if slug is not None:
        try:
            cave = Cave.objects.get(caveslug__slug=slug)
        except:
            return render(request, "errors/badslug.html", {"badslug": f"{slug} - from edit_cave()"})
    else:
        cave = Cave()
    if request.POST:
        form = CaveForm(request.POST, instance=cave)
        ceFormSet = CaveAndEntranceFormSet(request.POST)
        if form.is_valid() and ceFormSet.is_valid():
            # print(f'! POST is valid. {cave}')
            cave = form.save(commit=False)
            if slug is None:
                for a in form.cleaned_data["area"]:
                    if a.kat_area():
                        myArea = a.kat_area()
                if form.cleaned_data["kataster_number"]:
                    myslug = f"{myArea}-{form.cleaned_data['kataster_number']}"
                else:
                    myslug = f"{myArea}-{form.cleaned_data['unofficial_number']}"
            else:
                myslug = slug
            # Converting a PENDING cave to a real cave by saving this form
            myslug = myslug.replace("-PENDING-", "-")
            cave.filename = myslug + ".html"
            cave.save()
            form.save_m2m()
            if slug is None:
                cs = CaveSlug(cave=cave, slug=myslug, primary=True)
                cs.save()
            ceinsts = ceFormSet.save(commit=False)
            for ceinst in ceinsts:
                ceinst.cave = cave
                ceinst.save()
            try:
                cave_file = cave.file_output()
                write_and_commit([cave_file], f"Online edit of cave {cave}")
                # leave other exceptions unhandled so that they bubble up to user interface
            except PermissionError:
                message = f"CANNOT  save this file.\nPERMISSIONS incorrectly set on server for this file {cave.filename}. Ask a nerd to fix this."
                return render(request, "errors/generic.html", {"message": message})
            except subprocess.SubprocessError:
                message = f"CANNOT git on server for this file {cave.filename}. Edits may not be committed.\nAsk a nerd to fix this."
                return render(request, "errors/generic.html", {"message": message})

            return HttpResponseRedirect("/" + cave.url)
        else:
            message = f"! POST data is INVALID {cave}"
            print(message)
    else:
        # re-read cave data from file.
        filename = str(cave.slug() +".html")
        read_cave(filename, cave=cave)
        
        form = CaveForm(instance=cave)
        ceFormSet = CaveAndEntranceFormSet(queryset=cave.caveandentrance_set.all())

    return render(
        request,
        "editcave.html",
        {
            "form": form,
            "cave": cave,
            "message": message,
            "caveAndEntranceFormSet": ceFormSet,
        },
    )


@login_required_if_public
def edit_entrance(request, path="", caveslug=None, entslug=None):
    """This is the form that edits the entrance data for a single entrance and writes out
    an XML file in the :expoweb: repo folder
    
    The format for the file being saved is in templates/dataformat/entrance.xml
    
    Warning. This uses Django deep magic for multiple forms and the CaveAndEntrance class.

    It does save the data into into the database directly, not by parsing the file.
    """

    try:
        cave = Cave.objects.get(caveslug__slug=caveslug)
    except:
        return render(request, "errors/badslug.html", {"badslug": f"for cave {caveslug} - from edit_entrance()"})

    try:
        entrance = Entrance.objects.get(slug=entslug)
    except:
        return render(request, "errors/badslug.html", {"badslug": f"for entrance {slug}  - from edit_entrance()"})

    if entslug:
        # print(f"{caveslug=} {entslug=} {path=}")
        caveAndEntrance = CaveAndEntrance.objects.get(entrance=entrance, cave=cave)
        entlettereditable = False
    else:
        entrance = Entrance()
        caveAndEntrance = CaveAndEntrance(cave=cave, entrance=entrance)
        entlettereditable = True

    if request.POST:
        form = EntranceForm(request.POST, instance=entrance)
        entletter = EntranceLetterForm(request.POST, instance=caveAndEntrance)
        if form.is_valid() and entletter.is_valid():
            entrance = form.save(commit=False)
            entrance_letter = entletter.save(commit=False)
            # print(f"- POST {caveslug=} {entslug=} {path=}")
            if entslug is None:
                if entletter.cleaned_data["entrance_letter"]:
                    slugname = cave.slug() + entletter.cleaned_data["entrance_letter"]
                else:
                    slugname = cave.slug()
                entrance.slug = slugname
                entrance.cached_primary_slug = slugname
                entrance.filename = slugname + ".html"
            entrance.save()
            entrance_file = entrance.file_output()
            print(f"Online edit of entrance {entrance.slug}")
            cave_file = cave.file_output()
            entrance.save()
            write_and_commit([entrance_file, cave_file], f"Online edit of entrance {entrance.slug}")
            if entslug is None:
                entrance_letter.save()
            return HttpResponseRedirect("/" + cave.url)
    else:
        # re-read entrance data from file.
        filename = str(entrance.slug +".html")
        read_entrance(filename, ent=entrance)

        form = EntranceForm(instance=entrance)
        if entslug is None:
            entletter = EntranceLetterForm()
        else:
            entletter = caveAndEntrance.entrance_letter

    return render(
        request,
        "editentrance.html",
        {
            "form": form,
            "cave": cave,
            "entletter": entletter,
            "entlettereditable": entlettereditable,
        },
    )


def ent(request, cave_id, ent_letter):
    cave = Cave.objects.filter(kataster_number=cave_id)[0]
    cave_and_ent = CaveAndEntrance.objects.filter(cave=cave).filter(entrance_letter=ent_letter)[0]
    return render(
        request,
        "entrance.html",
        {
            "cave": cave,
            "entrance": cave_and_ent.entrance,
            "letter": cave_and_ent.entrance_letter,
        },
    )

def cave_debug(request):
    ents = Entrance.objects.all().order_by('id')
    return render(
        request,
        "cave_debug.html",
        {"ents": ents},
    )
    

def get_entrances(request, caveslug):
    try:
        cave = Cave.objects.get(caveslug__slug=caveslug)
    except:
        return render(request, "errors/badslug.html", {"badslug": f"{caveslug} - from get_entrances()"})
    return render(
        request, "options.html", {"items": [(e.entrance.slug(), e.entrance.slug()) for e in cave.entrances()]}
    )


def caveQMs(request, slug, open=False):
    """Lists all the QMs on a particular cave
    relies on the template to find all the QMs for the cave specified in the slug, e.g. '1623-161'
    Now working in July 2022
    """
    try:
        cave = Cave.objects.get(caveslug__slug=slug)
    except:
        return render(request, "errors/badslug.html", {"badslug": f"{slug} - from caveQMs()"})

    if cave.non_public and settings.PUBLIC_SITE and not request.user.is_authenticated:
        return render(request, "nonpublic.html", {"instance": cave})
    elif open:
        return render(request, "cave_open_qms.html", {"cave": cave})
    else:
        return render(request, "cave_qms.html", {"cave": cave})


def qm(request, cave_id, qm_id, year, grade=None, blockname=None):
    """Reports on one specific QM
    Fixed and working July 2022, for both CSV imported QMs
    
    Needs refactoring though! Uses extremely baroque way of getting the QMs instead of querying for QM objects
    directly, presumably as a result of a baroque history.

    Many caves have several QMS with the same number, grade, year (2018) and first 8 chars of the survexblock. This crashes things, so the terminal char of the survexblock name was added
    """

    year = int(year)

    if blockname == "" or not blockname:
        # CSV import QMs, use old technique
        try:
            c = getCave(cave_id)
            manyqms =  c.get_open_QMs() | c.get_ticked_QMs() # set union operation
            qm = manyqms.get(number=qm_id, expoyear=year, grade=grade)
            return render(request, "qm.html", {"qm": qm})
        except QM.DoesNotExist:
            # raise
            return render(
                request,
                "errors/badslug.html",
                {
                    "badslug": f"QM.DoesNotExist blockname is empty string: {cave_id=} {year=} {qm_id=} {grade=} {blockname=}"
                },
            )
        except QM.MultipleObjectsReturned:
            # raise
            qms = manyqms.filter(number=qm_id, expoyear=year)
            return render(
                request,
                "errors/badslug.html",
                {
                    "badslug": f"QM.MultipleObjectsReturned  {cave_id=} {year=} {qm_id=} {grade=} {blockname=} {qms=}"
                },
            )

    else:
        try:
            qmslug = f"{cave_id}-{year}-{blockname=}{qm_id}{grade}"
            print(f"{qmslug=}")
            c = getCave(cave_id)
            manyqms = c.get_open_QMs() | c.get_ticked_QMs() # set union operation
            qmqs = manyqms.filter(expoyear=year, blockname=blockname, number=qm_id, grade=grade)
            if len(qmqs) > 1:
                for q in qmqs:
                    print(qmqs)
                message = f"Multiple QMs with the same cave, year, number, grade AND first-several+terminal chars of the survexblock name. (Could be caused by incomplete databasereset). Fix this in the survex file(s). {cave_id=} {year=} {qm_id=} {blockname=}"
                return render(request, "errors/generic.html", {"message": message})
            else:
                qm = qmqs.get(expoyear=year, blockname=blockname, number=qm_id, grade=grade)
                if qm:
                    print(
                        qm,
                        f"{qmslug=}:{cave_id=} {year=} {qm_id=} {blockname=} {qm.expoyear=} {qm.completion_description=}",
                    )
                    return render(request, "qm.html", {"qm": qm})
                else:
                    # raise
                    return render(
                        request,
                        "errors/badslug.html",
                        {"badslug": f"Failed get {cave_id=} {year=} {qm_id=} {grade=} {blockname=}"},
                    )
        except MultipleObjectsReturned:
            message = f"Multiple QMs with the same cave, year, number, grade AND first-several+terminal chars of the survexblock name. (Could be caused by incomplete databasereset). Fix this in the survex file(s). {cave_id=} {year=} {qm_id=} {blockname=}"
            return render(request, "errors/generic.html", {"message": message})
        except QM.DoesNotExist:
            # raise
            return render(
                request,
                "errors/badslug.html",
                {
                    "badslug": f"QM.DoesNotExist blockname is not empty string {cave_id=} {year=} {qm_id=} {grade=} {blockname=}"
                },
            )