import os
import random
import shutil
import string
import subprocess
from pathlib import Path

import petname
from flask import Flask, flash, redirect, render_template, request, url_for
from flask_wtf import FlaskForm
from flask_wtf.csrf import CSRFProtect
from flask_wtf.file import FileAllowed, FileField, FileRequired
from temp_index import make_cards
from werkzeug.utils import secure_filename
from wtforms import HiddenField, RadioField, StringField
from wtforms.validators import DataRequired


def rand(length=30):
    """Generated random secret."""
    return "".join(random.choices(string.ascii_uppercase + string.digits, k=length))


app = Flask(__name__)
app.config["SECRET_KEY"] = os.environ.get("SECRET_KEY", rand())
app.config["WTF_CSRF_SECRET_KEY"] = os.environ.get("WTF_CSRF_SECRET_KEY", rand())


CWD = Path().resolve()


class UploadForm(FlaskForm):
    metadata = FileField(
        "Metadata file",
        validators=[FileAllowed(["db"], "Metadata databases only")],
    )
    title = RadioField(
        "Title", choices=[("side a", "side a"), ("side b", "side b")], default="side a"
    )
    authors = RadioField(
        "Authors",
        choices=[("side a", "side a"), ("side b", "side b")],
        default="side a",
    )
    comments = RadioField(
        "Comments",
        choices=[("side a", "side a"), ("side b", "side b")],
        default="side a",
    )
    timestamp = RadioField(
        "Timestamp",
        choices=[("side a", "side a"), ("side b", "side b")],
        default="side a",
    )
    tags = RadioField(
        "Tags", choices=[("side a", "side a"), ("side b", "side b")], default="side b"
    )
    petname = HiddenField("petname")


def impose_cards(fpath):
    """Impose the cards with pdfcpu."""
    if shutil.which("pdfcpu"):
        old_fpath = "{}.old.pdf".format(fpath)
        shutil.move(fpath, old_fpath)
        cmd = 'pdfcpu booklet -- "p:A4, border:on" {} 4 {}'.format(fpath, old_fpath)
        subprocess.run(cmd, shell=True)


@app.route("/")
def home():
    upload_form = UploadForm()
    pname = petname.generate()
    pname_msg = "Index of/~{}".format(pname)
    # pname_msg = "You are now {}".format(pname)
    return render_template(
        "index.html",
        upload_form=upload_form,
        petname=pname,
        petname_message=pname_msg,
    )

@app.route("/about")
def about():
    return render_template(
        "about.html",
    )

@app.route("/upload", methods=["POST"])
def upload():
    upload_form = UploadForm()

    if upload_form.validate_on_submit():
        if not upload_form.metadata.data:
            pname = upload_form.petname.data
            metadata_name = "metadata-{}.db".format(pname)
            if not Path(os.path.join(CWD, "metadatum", metadata_name)).exists():
                flash("Oops, you forgot to upload a metadata file...")
                # pname_msg = "You are still {}".format(pname)
                pname_msg = "Index of/~{}".format(pname)

                return render_template(
                    "index.html",
                    upload_form=upload_form,
                    petname_message=pname_msg,
                    petname=pname,
                )

        pname = upload_form.petname.data
        # pname_msg = "You are still {}".format(pname)
        pname_msg = "Index of/~{}".format(pname)


        metadata_name = "metadata-{}.db".format(pname)
        if upload_form.metadata.data:
            f = upload_form.metadata.data
            f.save(os.path.join(CWD, "metadatum", metadata_name))

        pdf_name = "index-{}.pdf".format(pname)
        # pdf_view = "{}.pdf#view=FitH".join(pname)
        pdf_path = os.path.join(CWD, "static", "generated", pdf_name)
        metadata_conn = "sqlite:///{}".format(
            os.path.join(CWD, "metadatum", metadata_name)
        )

        fields = ["title", "authors", "comments", "timestamp", "tags"]
        side_a = [
            field
            for field in upload_form.data.keys()
            if field in fields and upload_form.data[field] == "side a"
        ]
        side_b = [
            field
            for field in upload_form.data.keys()
            if field in fields and upload_form.data[field] == "side b"
        ]

        make_cards(
            pdf_path,
            metadata_conn,
            side_a,
            side_b,
        )

        impose_cards(pdf_path)

        gen_msg = (
            "Currently working on {}, click 'generate' to re-generate the same PDF"
        ).format(pdf_name)
        pdf_url = url_for("static", filename="generated/{}".format(pdf_name))

        return render_template(
            "index.html",
            upload_form=upload_form,
            pdf=pdf_url,
            petname=pname,
            petname_message=pname_msg,
            generation_message=gen_msg,
        )
    else:
        pname = upload_form.petname.data
        pname_msg = "You are still {}".format(pname)
        return render_template(
            "index.html",
            upload_form=upload_form,
            petname_message=pname_msg,
            petname=pname,
        )

    pname = petname.generate()
    pname_msg = "You have become {}".format(pname)
    return render_template(
        "index.html", upload_form=upload_form, petname_message=pname_msg, petname=pname
    )