from invoice import Invoice, Tax, Product, Conf
import db
from jinja2 import Template

from csv import DictWriter
import datetime
from functools import wraps
from argparse import ArgumentParser as ap
import tempfile
import subprocess
import sqlite3
from configparser import ConfigParser
import os
from os import path


# MOVE THIS TO Conf
CONFIG_FILE = ""
TEMPLATE_DIR = ""


def load_config():
    basedir = os.environ.get("XDG_CONFIG_HOME", None) or \
              path.join(os.environ["HOME"], ".config")

    basedir = path.join(basedir, "fracture")
    confile = path.join(basedir, "config")

    global CONFIG_FILE
    CONFIG_FILE = confile

    conf = ConfigParser()
    conf.read(confile)

    # VAT-types
    for k in conf["vat"]:
        Product.VATS += (float(conf["vat"][k]),)

    # SERIES
    for k in conf["series"]:
        Invoice.SERIES[int(k)] = conf["series"][k]

    if Invoice.SERIES == {}:
        raise "Invoice series not configured correctly: no series found"

    # ID FORMAT
    FORMAT = conf["invoice"].get("id_format",
             '"%s/%s/%s" % (series, date.year, id)')

    def f(series, date, id):
        return eval(FORMAT, None, {"series": series, "date": date, "id": id})

    Invoice.ID_FORMAT =  f

    # CURRENCY
    Conf.CURRENCY  = conf["invoice"].get("currency", "€")
    Conf.CURRENCY_DECIMAL = conf["invoice"].getint("currency_decimal", 2)

    # TEMPLATE directory
    global TEMPLATE_DIR
    TEMPLATE_DIR = conf["invoice"].get("templatedir", "")
    TEMPLATE_DIR = path.expandvars(TEMPLATE_DIR)
    TEMPLATE_DIR = path.expanduser(TEMPLATE_DIR)
    if not path.isabs(TEMPLATE_DIR):
        TEMPLATE_DIR = path.join(basedir, TEMPLATE_DIR)

    # INVOICE LEVEL TAXES (like IRPF in Spain)
    tax = ()
    for k in conf["taxes"]:
        tax += (Tax(k, conf.getfloat("taxes",k)),)
    Invoice.DEFAULT_TAXES = tax

    # DATABASE
    Invoice.DB_FILE = path.join(basedir, "invoice.db")
    if not path.exists(Invoice.DB_FILE):
        db.create(Invoice.DB_FILE)

def call_editor(filename):
    """ Edit filename with $EDITOR (fallback to Vim) """
    if not os.path.exists(filename):
        raise FileNotFoundError("File not found: " + filename)
    process = subprocess.Popen([os.environ.get("EDITOR", "vim"), filename],)
    process.wait()

def edit(contents):
    """ Edit temporary file with initial `contents` and return it"s edited
    content """

    with tempfile.NamedTemporaryFile(mode="w", delete=False) as t:
        t.write(contents)

    call_editor(t.name)

    with open(t.name) as t:
        edited_content = t.read()

    if os.path.exists(t.name):
        os.remove(t.name)

    return edited_content

def command(f):
    @wraps(f)
    def remove_func_arg(namespace):
        kwargs = vars(namespace)
        del kwargs["func"]
        f(**kwargs)
    return remove_func_arg

@command
def edit_config():
    # TODO: Generate config file if not created
    call_editor(CONFIG_FILE)

@command
def new_invoice():
    num = Invoice.from_config( edit( Invoice().to_config() )).persist()
    #
    print(num)
    # edit(Invoice.load(num).to_config())

@command
def summarize(xlsx=False, year=None, quarter=None):
    invoices = Invoice.load_by_date(year, quarter)
    rows     = sorted((map(lambda x: x.to_row(), invoices)),
                 key=lambda x: x["type"])

    keys = list(rows[0].keys())
    # FIXME all rows don't match and I'm putting them together in weird orders
    for r in rows:
        for k in r.keys():
            if k not in keys:
                keys.append(k)
    import sys
    wrtr = DictWriter(sys.stdout, keys)
    wrtr.writeheader()
    for r in rows:
        wrtr.writerow(r)

@command
def render(id, template=None, type=None, list_templates=None):
    if list_templates:
        # List the template directory and exit
        print("Current templatedir:", TEMPLATE_DIR)
        print("Available files: ")
        for i in os.listdir(TEMPLATE_DIR):
            print("\t", i)
        return

    # Find templates and make them work
    if format is None:
        raise ValueError("No format specified")

    invoice = Invoice.load(id, type)
    if invoice is None:
        raise ValueError("No invoice found")

    with open(path.join(TEMPLATE_DIR, template) , "r") as f:
        template_text = f.read()
    template = Template(template_text)
    print(template.render(invoice=invoice.to_dict()))

@command
def to_json(id, type=None):
    invoice = Invoice.load(id, type)
    print(invoice.to_json())

if __name__ == "__main__":
    load_config()

    parser = ap(prog="fracture")
    parser.set_defaults(func=lambda _: parser.print_help())
    subparsers = parser.add_subparsers(title= "Subcommands",
                help="sub-command help")

    # New Invoice
    new_parser = subparsers.add_parser("new", aliases=["n"], help="a help")
    new_parser.set_defaults(func=new_invoice)

    # Configure fracture
    configure_parser = subparsers.add_parser("configure",
        aliases=["c","conf","config"],
        help="b help")
    configure_parser.set_defaults(func=edit_config)

    # Summary
    summary_parser = subparsers.add_parser("summary", aliases=["s", "sum"],
        help="Display summary for tax declarations")
    summary_parser.add_argument("--xlsx", action="store_true",
        help="Output as xlsx")
    summary_parser.add_argument("--quarter", type=int,
        help="Obtain the summary of the quarter")
    summary_parser.add_argument("--year", type=int,
        default=datetime.datetime.now().year,
        help="Obtain the summary of the year")
    summary_parser.set_defaults(func=summarize)

    # Render invoice
    summary_parser = subparsers.add_parser("render", aliases=["rend", "r"],
        help="Render chosen invoice in the format defined by a template")
    summary_parser.add_argument("id", type=str,
        help="Invoice identification string")
    summary_parser.add_argument("--type", type=str,
        help="Invoice type", default="sent")
    summary_parser.add_argument("--template", "-t", type=str,
        help="Template to use", default="template.tex")
    summary_parser.add_argument("--list-templates", "-l",
            action="store_true", default=False,
            help="List available templates, ignores other options.")
    summary_parser.set_defaults(func=render)


    # jsonify
    json_parser = subparsers.add_parser("json", aliases=["j"],
        help="Dump chosen invoice in json format")
    json_parser.add_argument("id", type=str,
        help="Invoice identification string")
    json_parser.add_argument("--type", type=str,
        help="Invoice type", default="sent")
    json_parser.set_defaults(func=to_json)

    # parse
    args = parser.parse_args()
    args.func(args)