from datetime import datetime, timezone
from flask import current_app as app
from flask import g
import os
from werkzeug.utils import secure_filename

def create_result_table(key):
    cur = g.db.cursor()
    cur.execute("""
    CREATE TABLE IF NOT EXISTS `%s` (
        question TEXT,
        answer TEXT,
        answer_type TEXT
    );
    """%(key, )
    )
    g.db.commit()

def create_voter_table(db, name):
    table_name = get_voter_table_name(name)
    cur = db.cursor()

    cur.execute("""
    CREATE TABLE IF NOT EXISTS `%s` (
        token TEXT PRIMARY KEY,
        answered BOOLEAN
    );
    """%(table_name, )
    )
    db.commit()

def get_voter_table_name(key):
    return key + "__voters"


def get_result_table_name(key):
    return key


def has_voted(key, token):
    cur = g.db.cursor()
    cur.execute(
        "SELECT token FROM %s WHERE token = ? AND answered = 'true'"%(
            get_voter_table_name(key),
        ),
        (
            token,
        )
    )
    return len(cur.fetchall()) > 0


def is_draft(form):
    return form['draft']

def is_expired(form):
    if form['expires'] == None:
        return False

    return datetime.now(timezone.utc) > form['expires']

def is_key(key, cli_opts = False):
    key = secure_filename(key)

    if cli_opts:
        root_path = cli_opts.questions
    else:
        root_path = app.config['QUESTIONS']

    return os.path.exists(
        os.path.join(
            root_path,
            key + ".txt"
        )
    )

def parse_form(key):
    form = {
        'expires': None,
        'draft': False,
        'questions': []
    }
    key = secure_filename(key)
    try:
        current_question = None
        with open(os.path.join(app.config['QUESTIONS'], key + ".txt"), "rt") as fp:
            for row in fp:
                if row.strip() == "":
                    continue
                if row.startswith("#"):
                    continue
                if row.lower().startswith("expires: "):
                    form['expires'] = parse_row_date(row)
                    continue
                if row.lower().startswith("draft: "):
                    if row.lower().rstrip() == "draft: true":
                        form['draft'] = True
                    continue
                if row.startswith("- "):
                    if current_question == None:
                        continue
                    form['questions'][current_question]['choices'].append(
                        row[2:].strip()
                    )
                    continue
                if row.startswith("+ "):
                    if current_question == None:
                        continue
                    form['questions'][current_question]['multichoices'].append(
                        row[2:].strip()
                    )
                    continue
                current_question = len(form['questions'])
                form['questions'].append({
                    'choices': [],
                    'multichoices': [],
                    'index': len(form['questions']) + 1,
                    'name': row.strip().rstrip("_:").rstrip(),
                    'open_question': row.strip().endswith("___")
                })
        return form
    except Exception as err:
        if app.config['DEBUG']:
            raise err
        return False


def parse_row_date(row):
    row = row[9:].strip()
    if row.lower() == "none":
        return None
    try:
        return datetime.strptime(
            row,
            '%Y-%m-%d %H:%M %z'
        )
    except Exception as err:
        if app.config['DEBUG']:
            print(row)
            raise err
        return None

def write_vote(key, token, answers, form):

    cur = g.db.cursor()
    for question in form['questions']:
        answer = None
        answer_type = None
        if 'QC%d'%( question['index'], ) in answers:
            answer = (answers['QC%d'%( question['index'], )],)
            answer_type = "single"
        if 'QM%d'%( question['index'], ) in answers:
            answer = answers.getlist('QM%d'%( question['index'], ))
            answer_type = "multiple"
        if 'QO%d'%( question['index'], ) in answers:
            answer = (answers['QO%d'%( question['index'], )],)
            answer_type = "open"
        if answer == None:
            continue
        for single in answer:
            cur.execute(
                "INSERT INTO %s VALUES (?, ?, ?)"%(
                    key,
                ),
                (
                    question['name'],
                    single.strip(),
                    answer_type
                )
            )

    cur.execute(
        "UPDATE %s SET answered = 'true' WHERE token = ?"%(
            get_voter_table_name(key),
        ),
        (
            token,
        )
    )
    g.db.commit()


def time_to_expiry(form):
    if form['expires'] == None:
        return "Never"

    time_to_go = form['expires'] - datetime.now(timezone.utc)
    time_to_go = ".".join(str(time_to_go).split('.')[0:-1])[0:-3]

    #time_to_go.microseconds = 0
    return "%s (%s to go)"%( form['expires'], time_to_go )