"""This parses the varlib.csv but only in a way
that is actually useful for the site"""
from tempfile import NamedTemporaryFile
import shutil
import csv
import os

script_dir = os.path.dirname(__file__)
image_dir = os.path.abspath(os.path.join(script_dir, "../static/images"))
fieldnames = [
    'Id',
    'Publication',
    'Author',
    'Year',
    'Custodian',
    'Fields',
    'Type',
    'Publishers',
    'License',
    'LicenseShort',
    'Highlights',
    'Comments',
    'Currently borrowed by',
]


def parsecsv():
    """Test function to inspect csv file as dict"""
    libcsv = open(os.path.join(script_dir, "varlib.csv"), "r")
    with libcsv:
        csv_as_dict = csv.DictReader(libcsv)
    return csv_as_dict


def getpublications():
    """get an overview of all publications for the main page"""
    libcsv = open(os.path.join(script_dir, "varlib.csv"), "r")
    with libcsv:
        csv_as_dict = csv.DictReader(libcsv)
        publications = {}
        for row in csv_as_dict:
            year = row["Year"]
            if not year:
                year = "Unknown"

            pubinfo = {
                "Title": row["Publication"],
                "Author": row["Author"],
                "Type": row["Type"].lower().title(),
                "Year": year,
                "License": row["LicenseShort"].lower().title(),
                "Image": hasimage(row["Id"])
            }
            publications[row["Id"]] = pubinfo
    return publications


def hasimage(id):
    """does this Id from the csv have an image uploaded"""
    image_jpg = os.path.join(image_dir, "image-{0}.jpg".format(id))
    if os.path.exists(image_jpg):
        return True
    else:
        return False


def gettypes():
    """for the dynamic menu get the unique types of publicatons"""
    libcsv = open(os.path.join(script_dir, "varlib.csv"), "r")
    with libcsv:
        csv_as_dict = csv.DictReader(libcsv)
        listoftypes = []
        for row in csv_as_dict:
            lowertype = row["Type"].lower().title()
            if lowertype not in listoftypes:
                listoftypes.append(lowertype)
    return listoftypes


def getyears():
    """for the dynamic menu get the unique years for publicatons"""
    libcsv = open(os.path.join(script_dir, "varlib.csv"), "r")
    with libcsv:
        csv_as_dict = csv.DictReader(libcsv)
        listofyears = []
        for row in csv_as_dict:
            uniqueyear = row["Year"]
            if not uniqueyear:
                uniqueyear = "Unknown"
            if uniqueyear not in listofyears:
                listofyears.append(uniqueyear)
    listofyears.sort()
    return listofyears


def getlicenses():
    """for the dynamic menu get the unique liscenses for publicatons"""
    libcsv = open(os.path.join(script_dir, "varlib.csv"), "r")
    with libcsv:
        csv_as_dict = csv.DictReader(libcsv)
        listoflicenses = []
        for row in csv_as_dict:
            license = row["LicenseShort"].lower().title()
            if not license:
                license = "No License Mentioned"
            if license not in listoflicenses:
                listoflicenses.append(license)
    return listoflicenses


def getfieldsofinterest():
    """for the R&R page get the fields of interest from the publicatons"""
    libcsv = open(os.path.join(script_dir, "varlib.csv"), "r")
    with libcsv:
        csv_as_dict = csv.DictReader(libcsv)
        fieldsofinterest = {}
        for row in csv_as_dict:
            fields = row["Fields"].split(',')
            fieldsofinterest[row["Id"]] = fields
    return fieldsofinterest


def getpublicationfromcsvrow(row):
    """get entire publication info from a csv row"""
    year = row["Year"]
    if not year:
        year = "Unknown"

    license = row["License"]
    if not license:
        license = "No license mentioned"

    borrowed = row["Currently borrowed by"]
    if not borrowed:
        borrowed = "No one"

    pubinfo = {
        "Title": row["Publication"],
        "Author": row["Author"],
        "Year": year,
        "Custodian": row["Custodian"],
        "Fields": row["Fields"],
        "Type": row["Type"],
        "Publishers": row["Publishers"],
        "License": license,
        "Highlights": row["Highlights"],
        "Comments": row["Comments"],
        "Borrowed": borrowed,
        "Image": hasimage(row["Id"])
    }
    return pubinfo


def getfullpublication(pubid):
    """For the single book view, most complete overview"""
    libcsv = open(os.path.join(script_dir, "varlib.csv"), "r")
    pubinfo = {}
    with libcsv:
        csv_as_dict = csv.DictReader(libcsv)
        for row in csv_as_dict:
            if pubid == row["Id"]:
                pubinfo = getpublicationfromcsvrow(row)

    # print(pubinfo)
    return pubinfo


def generatenewpublicationid():
    """When uploading a book generate a new unique ID"""
    libcsv = open(os.path.join(script_dir, "varlib.csv"), "r")
    allidsincsv = []
    with libcsv:
        csv_as_dict = csv.DictReader(libcsv)
        for row in csv_as_dict:
            allidsincsv.append(int(row["Id"]))
        return str(max(allidsincsv) + 1)


def writepublication(uploadform):
    """When uploading a publication writes entry to the csv"""
    id = generatenewpublicationid()
    with open(
            os.path.join(script_dir, "varlib.csv"),
            'a',
            newline='') as csvfile:
        csv_as_writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
        csv_as_writer.writerow(
            {
                "Id": id,
                "Publication": uploadform.uploadpublication.data,
                "Author": uploadform.author.data,
                "Year": uploadform.year.data,
                "Custodian": uploadform.custodian.data,
                "Fields": uploadform.fields.data,
                "Type": uploadform.type.data,
                "Publishers": uploadform.publishers.data,
                "License": uploadform.license.data,
                "LicenseShort": uploadform.licenseshort.data,
                "Highlights": uploadform.highlights.data,
                "Comments": uploadform.comments.data,
                "Currently borrowed by": uploadform.borrowed.data,
            })
        print("succesfully written book to csv")
    return id


def editborrowedby(pubid, borrower):
    """Edits the borrowed by field for a publication entry in csv"""
    tempfile = NamedTemporaryFile('w+t', newline='', delete=False)
    filename = os.path.join(script_dir, "varlib.csv")
    with open(filename, 'r', newline='') as libcsv, tempfile:
        csv_as_dict = csv.DictReader(libcsv)
        csv_as_writer = csv.DictWriter(tempfile, fieldnames=fieldnames)
        # use the reader to read where, then writer to write the new row.
        csv_as_writer.writeheader()
        for row in csv_as_dict:
            if pubid == row["Id"]:
                print("publication changes borrower")
                print(row["Publication"])
                row["Currently borrowed by"] = borrower
            csv_as_writer.writerow(row)

    shutil.move(tempfile.name, filename)