import datetime
import json
import random
import string

import click

from libs.password import password_pattern, valid_password, hash_password
from libs.helper import email as email_validate
from extensions.ext_database import db
from models.account import InvitationCode
from models.model import Account, AppModelConfig, ApiToken, Site, App, RecommendedApp
import secrets
import base64


@click.command('reset-password', help='Reset the account password.')
@click.option('--email', prompt=True, help='The email address of the account whose password you need to reset')
@click.option('--new-password', prompt=True, help='the new password.')
@click.option('--password-confirm', prompt=True, help='the new password confirm.')
def reset_password(email, new_password, password_confirm):
    if str(new_password).strip() != str(password_confirm).strip():
        click.echo(click.style('sorry. The two passwords do not match.', fg='red'))
        return
    account = db.session.query(Account). \
        filter(Account.email == email). \
        one_or_none()
    if not account:
        click.echo(click.style('sorry. the account: [{}] not exist .'.format(email), fg='red'))
        return
    try:
        valid_password(new_password)
    except:
        click.echo(
            click.style('sorry. The passwords must match {} '.format(password_pattern), fg='red'))
        return

    # generate password salt
    salt = secrets.token_bytes(16)
    base64_salt = base64.b64encode(salt).decode()

    # encrypt password with salt
    password_hashed = hash_password(new_password, salt)
    base64_password_hashed = base64.b64encode(password_hashed).decode()
    account.password = base64_password_hashed
    account.password_salt = base64_salt
    db.session.commit()
    click.echo(click.style('Congratulations!, password has been reset.', fg='green'))


@click.command('reset-email', help='Reset the account email.')
@click.option('--email', prompt=True, help='The old email address of the account whose email you need to reset')
@click.option('--new-email', prompt=True, help='the new email.')
@click.option('--email-confirm', prompt=True, help='the new email confirm.')
def reset_email(email, new_email, email_confirm):
    if str(new_email).strip() != str(email_confirm).strip():
        click.echo(click.style('Sorry, new email and confirm email do not match.', fg='red'))
        return
    account = db.session.query(Account). \
        filter(Account.email == email). \
        one_or_none()
    if not account:
        click.echo(click.style('sorry. the account: [{}] not exist .'.format(email), fg='red'))
        return
    try:
        email_validate(new_email)
    except:
        click.echo(
            click.style('sorry. {} is not a valid email. '.format(email), fg='red'))
        return

    account.email = new_email
    db.session.commit()
    click.echo(click.style('Congratulations!, email has been reset.', fg='green'))


@click.command('generate-invitation-codes', help='Generate invitation codes.')
@click.option('--batch', help='The batch of invitation codes.')
@click.option('--count', prompt=True, help='Invitation codes count.')
def generate_invitation_codes(batch, count):
    if not batch:
        now = datetime.datetime.now()
        batch = now.strftime('%Y%m%d%H%M%S')

    if not count or int(count) <= 0:
        click.echo(click.style('sorry. the count must be greater than 0.', fg='red'))
        return

    count = int(count)

    click.echo('Start generate {} invitation codes for batch {}.'.format(count, batch))

    codes = ''
    for i in range(count):
        code = generate_invitation_code()
        invitation_code = InvitationCode(
            code=code,
            batch=batch
        )
        db.session.add(invitation_code)
        click.echo(code)

        codes += code + "\n"
    db.session.commit()

    filename = 'storage/invitation-codes-{}.txt'.format(batch)

    with open(filename, 'w') as f:
        f.write(codes)

    click.echo(click.style(
        'Congratulations! Generated {} invitation codes for batch {} and saved to the file \'{}\''.format(count, batch,
                                                                                                          filename),
        fg='green'))


def generate_invitation_code():
    code = generate_upper_string()
    while db.session.query(InvitationCode).filter(InvitationCode.code == code).count() > 0:
        code = generate_upper_string()

    return code


def generate_upper_string():
    letters_digits = string.ascii_uppercase + string.digits
    result = ""
    for i in range(8):
        result += random.choice(letters_digits)

    return result


@click.command('gen-recommended-apps', help='Number of records to generate')
def generate_recommended_apps():
    print('Generating recommended app data...')
    apps = App.query.filter(App.is_public == True).all()
    for app in apps:
        recommended_app = RecommendedApp(
            app_id=app.id,
            description={
                'en': 'Description for ' + app.name,
                'zh': '描述 ' + app.name
            },
            copyright='Copyright ' + str(random.randint(1990, 2020)),
            privacy_policy='https://privacypolicy.example.com',
            category=random.choice(['Games', 'News', 'Music', 'Sports']),
            position=random.randint(1, 100),
            install_count=random.randint(100, 100000)
        )
        db.session.add(recommended_app)
    db.session.commit()
    print('Done!')


def register_commands(app):
    app.cli.add_command(reset_password)
    app.cli.add_command(reset_email)
    app.cli.add_command(generate_invitation_codes)
    app.cli.add_command(generate_recommended_apps)