from flask import (
    Blueprint, flash, g, redirect, render_template, request, url_for
)
from werkzeug.exceptions import abort

from servecerts.auth import login_required
from servecerts.db import get_db

import hashlib
import base64

#bp = Blueprint('pubkeys', __name__, url_prefix='/pubkeys')
bp = Blueprint('pubkeys', __name__, url_prefix='/pubkeys')

@bp.route('/')
@login_required
def index():
    db = get_db()
    pubkeys = db.execute(
        'SELECT'
        ' p.id, key_name, fullname, ssh_pubkey, p.created, user_id, revoked, deleted'
        ' FROM pubkeys p'
        ' JOIN user u ON p.user_id = u.id'
        ' ORDER BY deleted ASC, revoked ASC, p.created DESC'
    ).fetchall()
    users = db.execute(
        'SELECT * FROM user WHERE id = ?', (g.user['id'],)
    ).fetchone()
    return render_template('pubkeys/index.html', pubkeys=pubkeys, users=users)

def get_pubkey(id, check_user=True):
    pubkey = get_db().execute(
        'SELECT p.id, ssh_pubkey, key_name, user_id, fingerprint, deleted'
        ' FROM pubkeys p JOIN user u ON p.user_id = u.id'
        ' WHERE p.id = ?', (id,)
    ).fetchone()

    if pubkey is None:
        abort(404, "Pubkey id {0} does not exist.".format(id))

    if check_user and pubkey['user_id'] != g.user['id']:
        abort(403)

    return pubkey

@bp.route('/create', methods=('GET', 'POST'))
@login_required
def create():
    if request.method == 'POST':
        key_name = request.form['key_name']
        ssh_pubkey = request.form['ssh_pubkey']
        splitkey = ssh_pubkey.split(' ')
        enc = splitkey.pop(0)
        key = splitkey.pop(0)
        comment = ' '.join(splitkey)
        fingerprint = base64.b64encode(hashlib.sha256(base64.b64decode(key)).digest()).rstrip("=")
        print fingerprint

        db = get_db()
        ckfp = db.execute(
           'SELECT id, fingerprint, deleted FROM pubkeys WHERE fingerprint = ?', (fingerprint, )
        ).fetchone()

        if ckfp != None:
            if ckfp['fingerprint']  == fingerprint:
                if ckfp['deleted'] == 0:
                    error = "Key exists already"
                else:
                    error = "Key was deleted before -> reactivate it again!"
                flash(error)
                return redirect(url_for('pubkeys.update', id=ckfp['id']))

        if not key_name:
            key_name = comment
        error = None

        if not ssh_pubkey:
            error = 'SSH-Pubkey is required.'

        if error is not None:
            flash(error)
        else:
            #db = get_db()
            db.execute(
                'INSERT INTO pubkeys (ssh_pubkey, key_name, user_id, fingerprint)'
                ' VALUES (?, ?, ?, ?)',
                (ssh_pubkey, key_name, g.user['id'], fingerprint)
            )
            db.commit()
            return redirect(url_for('pubkeys.index'))

    return render_template('pubkeys/create.html')

@bp.route('/<int:id>/update', methods=('GET', 'POST'))
@login_required
def update(id):
    pubkey = get_pubkey(id)

    if request.method == 'POST':
        key_name = request.form['key_name']
        deleted = request.form.get('deleted')
        error = None

        if not key_name:
            error = 'Key-ID is required.'

        deleted = 0 if not deleted else 1
#        if not ssh_pubkey:
#            error = "SSH-Pubkey is requred."

        if error is not None:
            flash(error)
        else:
            db = get_db()
            db.execute(
                'UPDATE pubkeys SET key_name = ?, deleted = ?'
                ' WHERE id = ?',
                (key_name, deleted, id)
            )
            db.commit()
            return redirect(url_for('pubkeys.index'))

    return render_template('pubkeys/update.html', pubkey=pubkey)

@bp.route('/<int:id>/delete', methods=('GET',))
@login_required
def delete(id):
    get_pubkey(id)
    db = get_db()
    #db.execute('DELETE FROM pubkeys WHERE id = ?', (id,))
    db.execute('UPDATE pubkeys SET deleted = 1 WHERE id = ?', (id,))
    db.execute('UPDATE certificates SET deleted = 1 WHERE pubkey_id = ?', (id,))
    db.commit()
    return redirect(url_for('pubkeys.index'))

@bp.route('/<int:id>/deletefinal', methods=('GET',))
@login_required
def deletefinal(id):
    get_pubkey(id)
    db = get_db()
    db.execute('DELETE FROM pubkeys WHERE id = ?', (id,))
    #db.execute('UPDATE certificates SET deleted = 1 WHERE pubkey_id = ?', (id,))
    db.commit()
    return redirect(url_for('pubkeys.index'))

@bp.route('/<int:id>/revoke', methods=('POST', 'GET'))
@login_required
def revoke(id):
    get_pubkey(id)
    db = get_db()
    db.execute(
        'UPDATE pubkeys SET revoked = 1'
        ' WHERE id = ?', (id,)
    )
    db.commit()
    return redirect(url_for('pubkeys.index'))