from ..forms.admin import AddTimeAdjustment, CreateTest, CreateUser, DeleteUser, Login, Register, ResetPassword, UpdatePassword, UpdateUser, UploadData
from ..models import Dataset, Entry, Test, User
from ..tools.auth import disable_if_logged_in, require_account_creation
from ..tools.forms import get_dataset_choices, get_time_options
from ..tools.data import check_is_json, validate_json
from ..tools.test import get_correct_answers

from flask import Blueprint, jsonify, render_template, redirect, request, session
from flask.helpers import flash, url_for
from flask_login import current_user, login_required

from datetime import date, datetime, timedelta
from json import loads
import secrets

admin = Blueprint(
    name='admin',
    import_name=__name__,
    template_folder='templates',
    static_folder='static'
)

@admin.route('/')
@admin.route('/home/')
@admin.route('/dashboard/')
@login_required
def _home():
    tests = Test.query.all()
    results = Entry.query.all()
    current_tests = [ test for test in tests if test.end_date >= datetime.now() and test.start_date.date() <= date.today() ]
    current_tests.sort(key= lambda x: x.end_date, reverse=True)
    upcoming_tests = [ test for test in tests if test.start_date.date() > datetime.now().date()]
    upcoming_tests.sort(key= lambda x: x.start_date)
    recent_results = [result for result in results if not result.status == 'started' ]
    recent_results.sort(key= lambda x: x.end_time, reverse=True)
    for result in recent_results:
        result['percent'] = round(100*result['result']['score']/result['result']['max'])
    return render_template('/admin/index.html', current_tests = current_tests, upcomimg_tests = upcoming_tests, recent_results = recent_results)

@admin.route('/settings/')
@login_required
def _settings():
    users = User.query.all()
    datasets = Dataset.query.all()
    return render_template('/admin/settings/index.html', users=users, datasets=datasets)

@admin.route('/login/', methods=['GET','POST'])
@disable_if_logged_in
@require_account_creation
def _login():
    form = Login()
    if request.method == 'POST':
        if form.validate_on_submit():
            users = User.query.all()
            user = None
            for _user in users:
                if _user.get_username() == request.form.get('username').lower():
                    user = _user
                    break
            if user:
                if user.verify_password(request.form.get('password')):
                    user.login(remember=request.form.get('remember'))
                    return jsonify({'success': f'Successfully logged in.'}), 200
                return jsonify({'error': f'The password you entered is incorrect.'}), 401
            return jsonify({'error': f'The username you entered does not exist.'}), 401
        errors = [*form.username.errors, *form.password.errors]
        return jsonify({ 'error': errors}), 400
    if 'remembered_username' in session: form.username.data = session.pop('remembered_username')
    next = request.args.get('next')
    return render_template('/admin/auth/login.html', form=form, next=next)

@admin.route('/logout/')
@login_required
def _logout():
    current_user.logout()
    return redirect(url_for('admin._login'))

@admin.route('/register/', methods=['GET','POST'])
@disable_if_logged_in
def _register():
    from ..models.user import User
    form = Register()
    if request.method == 'POST':
        if form.validate_on_submit():
            new_user = User()
            new_user.set_username(request.form.get('username').lower())
            new_user.set_email(request.form.get('email').lower())
            new_user.set_password(request.form.get('password'))
            success, message = new_user.register()
            if success:
                flash(message=f'{message} Please log in to continue.', category='success')
                session['remembered_username'] = request.form.get('username').lower()
                return jsonify({'success': message}), 200
            flash(message=message, category='error')
            return jsonify({'error': message}), 401
        errors = [*form.username.errors, *form.email.errors, *form.password.errors, *form.password_reenter.errors]
        return jsonify({ 'error': errors}), 400
    return render_template('admin/auth/register.html', form=form)

@admin.route('/reset/')
def _reset():
    form = ResetPassword()
    if request.method == 'POST':
        if form.validate_on_submit():
            user = None
            users = User.query.all()
            for _user in users:
                if _user.get_username() == request.form.get('username'):
                    user = _user
                    break
            if not user: return jsonify({'error': 'The user account does not exist.'}), 400
            if not user.get_email() == request.form.get('email'): return jsonify({'error': 'The email address does not match the user account.'}), 400
            return user.reset_password()
        errors = [*form.username.errors, *form.email.errors]
        return jsonify({ 'error': errors}), 400
    
    token = request.args.get('token')
    if token:
        user = User.query.filter_by(reset_token=token).first()
        if not user: return redirect(url_for('admin._reset'))
        verification_token = user.verification_token
        user.clear_reset_tokens()
        if request.args.get('verification') == verification_token:
            form = UpdatePassword()
            return render_template('/auth/update_password.html', form=form, user=user.id)
        flash('The verification of your password reset request failed and the token has been invalidated. Please make a new reset password request.', 'error')

    return render_template('/admin/auth/reset.html', form=form)

@admin.route('/update_password/', methods=['POST'])
def _update_password():
    form = UpdatePassword()
    if form.validate_on_submit():
        user = request.form.get('user')
        user = User.query.filter_by(id=user).first()
        user.update(password=request.form.get('password'))
        session['remembered_username'] = user.get_username()
        flash('Your password has been reset.', 'success')
        return jsonify({'success':'Your password has been reset'}), 200
    errors = [*form.password.errors, *form.password_reenter.errors]
    return jsonify({ 'error': errors}), 401

@admin.route('/settings/users/', methods=['GET', 'POST'])
@login_required
def _users():
    form = CreateUser()
    users = User.query.all()
    if request.method == 'POST':
        if form.validate_on_submit():
            password = request.form.get('password')
            new_user = User()
            new_user.set_username(request.form.get('username').lower())
            new_user.set_password(secrets.token_hex(12)) if not password else password
            new_user.set_email(request.form.get('email'))
            success, message = new_user.register(notify=request.form.get('notify'))
            if success: return jsonify({'success': message}), 200
            return jsonify({'error': message}), 401
        errors = [*form.username.errors, *form.email.errors, *form.password.errors]
        return jsonify({ 'error': errors}), 401
    return render_template('/admin/settings/users.html', form = form, users = users)

@admin.route('/settings/users/delete/<string:id>', methods=['GET', 'POST'])
@login_required
def _delete_user(id:str):
    user = User.query.filter_by(id=id).first()
    form = DeleteUser()
    if request.method == 'POST': 
        if not user: return jsonify({'error': 'User does not exist.'}), 400
        if id == current_user.id: return jsonify({'error': 'Cannot delete your own account.'}), 400
        if form.validate_on_submit():
            password = request.form.get('password')
            if not current_user.verify_password(password): return jsonify({'error': 'The password you entered is incorrect.'}), 401
            success, message = user.delete(notify=request.form.get('notify'))
            if success: return jsonify({'success': message}), 200
            return jsonify({'error': message}), 400
        errors = form.password.errors
        return jsonify({ 'error': errors}), 400

    if id == current_user.id:
        flash('Cannot delete your own user account.', 'error')
        return redirect(url_for('admin._users'))
    if not user:
        flash('User not found.', 'error')
        return redirect(url_for('admin._users'))
    return render_template('/admin/settings/delete_user.html', form=form, id = id, user = user)

@admin.route('/settings/users/update/<string:id>', methods=['GET', 'POST'])
@login_required
def _update_user(id:str):
    user = User.query.filter_by(id=id).first()
    form = UpdateUser()
    if request.method == 'POST': 
        if not user: return jsonify({'error': 'User does not exist.'}), 400
        if form.validate_on_submit():
            if not user.verify_password(request.form.get('confirm_password')): return jsonify({'error': 'Invalid password for your account.'}), 401
            success, message = user.update(
                password = request.form.get('password'),
                email = request.form.get('email'),
                notify = request.form.get('notify')
            )
            if success:
                flash(message, 'success')
                return jsonify({'success': message}), 200
            return jsonify({'error': message}), 400
        errors = [*form.confirm_password.errors, *form.email.errors, *form.password.errors, *form.password_reenter.errors]
        return jsonify({ 'error': errors}), 400
    if not user:
        flash('User not found.', 'error')
        return redirect(url_for('admin._users'))
    return render_template('/admin/settings/update_user.html', form=form, id = id, user = user)

@admin.route('/settings/questions/', methods=['GET', 'POST'])
@login_required
def _questions():
    form = UploadData()
    if request.method == 'POST':
        if form.validate_on_submit():
            upload = form.data_file.data
            if not check_is_json(upload): return jsonify({'error': 'Invalid file. Please upload a JSON file.'}), 400
            if not validate_json(upload): return jsonify({'error': 'The data in the file is invalid.'}), 400 # TODO Perhaps make a more complex validation script
            new_dataset = Dataset()
            success, message = new_dataset.create(
                upload = upload,
                default = request.form.get('default')
            )
            if success: return jsonify({'success': message}), 200
            return jsonify({'error': message}), 400
        errors = form.data_file.errors
        return jsonify({ 'error': errors}), 400

    data = Dataset.query.all()
    return render_template('/admin/settings/questions.html', form=form, data=data)

@admin.route('/settings/questions/edit/', methods=['POST'])
@login_required
def _edit_questions():
    id = request.get_json()['id']
    action = request.get_json()['action']
    if action not in ['defailt', 'delete']: return jsonify({'error': 'Invalid action.'}), 400
    dataset = Dataset.query.filter_by(id=id).first()
    if action == 'delete': success, message = dataset.delete()
    elif action == 'default': success, message = dataset.make_default()
    if success: return jsonify({'success': message}), 200
    return jsonify({'error': message}), 400

@admin.route('/tests/<string:filter>/', methods=['GET'])
@admin.route('/tests/', methods=['GET'])
@login_required
def _tests(filter:str=None):
    datasets = Dataset.query.all()
    tests = None
    _tests = Test.query.all()
    form = None
    now = datetime.now()
    if not datasets:
        flash('There are no available question datasets. Please upload a question dataset in order to set up an exam.', 'error')
        return redirect(url_for('admin._questions'))
    if filter not in [None, '', 'create','active','scheduled','expired','all']: return redirect(url_for('admin._tests'))
    if filter == 'create':
        form = CreateTest()
        form.time_limit.choices = get_time_options()
        form.dataset.choices = get_dataset_choices()
        form.time_limit.default='none'
        form.process()
        display_title = ''
        error_none = ''
    if filter in [None, '', 'active']:
        tests = [ test for test in _tests if test.end_date >= now and test.start_date <= now ]
        display_title = 'Active Exams'
        error_none = 'There are no exams that are currently active. You can create one using the Creat Exam form.'
    if filter == 'expired':
        tests = [ test for test in _tests if test.end_date < now ]
        display_title = 'Expired Exams'
        error_none = 'There are no expired exams. Exams will appear in this category after their expiration date has passed.'
    if filter == 'scheduled':
        tests = [ test for test in _tests if test.start_date > now]
        display_title = 'Scheduled Exams'
        error_none = 'There are no scheduled exams pending. You can schedule an exam for the future using the Create Exam form.'
    if filter == 'all':
        tests = _tests
        display_title = 'All Exams'
        error_none = 'There are no exams set up. You can create one using the Create Exam form.'
    return render_template('/admin/tests.html', form = form, tests=tests, display_title=display_title, error_none=error_none, filter=filter)

@admin.route('/tests/create/', methods=['POST'])
@login_required
def _create_test():
    form = CreateTest()
    form.dataset.choices = get_dataset_choices()
    form.time_limit.choices = get_time_options()
    if form.validate_on_submit():
        new_test = Test()
        new_test.start_date = request.form.get('start_date')
        new_test.start_date = datetime.strptime(new_test.start_date, '%Y-%m-%dT%H:%M')
        new_test.end_date = request.form.get('expiry_date')
        new_test.end_date = datetime.strptime(new_test.end_date, '%Y-%m-%dT%H:%M')
        new_test.time_limit = request.form.get('time_limit')
        dataset = request.form.get('dataset')
        new_test.dataset = Dataset.query.filter_by(id=dataset).first()
        success, message = new_test.create()
        if success:
            flash(message=message, category='success')
            return jsonify({'success': message}), 200
        return jsonify({'error': message}), 400
    else:
        errors = [*form.start_date.errors, *form.expiry_date.errors, *form.time_limit.errors]
        return jsonify({ 'error': errors}), 400

@admin.route('/tests/edit/', methods=['POST'])
@login_required
def _edit_test():
    id = request.get_json()['id']
    action = request.get_json()['action']
    if action not in ['start', 'delete', 'end']: return jsonify({'error': 'Invalid action.'}), 400
    test = Test.query.filter_by(id=id).first()
    if not test: return jsonify({'error': 'Could not find the corresponding test to delete.'}), 404
    if action == 'delete': success, message = test.delete()
    if action == 'start': success, message = test.start()
    if action == 'end': success, message = test.end()
    if success:
        flash(message=message, category='success')
        return jsonify({'success': message}), 200
    return jsonify({'error': message}), 400

@admin.route('/test/<string:id>/', methods=['GET','POST'])
@login_required
def _view_test(id:str=None):    
    form = AddTimeAdjustment()
    test = Test.query.filter_by(id=id).first()
    if request.method == 'POST':
        if not test: return jsonify({'error': 'Invalid test ID.'}), 404
        if form.validate_on_submit():
            time = int(request.form.get('time'))
            success, message = test.add_adjustment(time)
            if success: return jsonify({'success': message}), 200
            return jsonify({'error': message}), 400
        return jsonify({'error': form.time.errors }), 400
    if not test:
        flash('Invalid test ID.', 'error')
        return redirect(url_for('admin._tests'))
    return render_template('/admin/test.html', test = test, form = form)

@admin.route('/test/<string:id>/delete-adjustment/', methods=['POST'])
@login_required
def _delete_adjustment(id:str=None):
    test = Test.query.filter_by(id=id).first()
    if not test: return jsonify({'error': 'Invalid test ID.'}), 404
    user_code = request.get_json()['user_code'].lower()
    success, message = test.remove_adjustment(user_code)
    if success: return jsonify({'success': message}), 200
    return jsonify({'error': message}), 400

@admin.route('/results/')
@login_required
def _view_entries():
    entries = Entry.query.all()
    return render_template('/admin/results.html', entries = entries)

@admin.route('/results/<string:id>/', methods = ['GET', 'POST'])
@login_required
def _view_entry(id:str=None):
    entry = Entry.query.filter_by(id=id)
    if request.method == 'POST':
        if not entry: return jsonify({'error': 'Invalid entry ID.'}), 404
        action = request.get_json()['action']
        if action not in ['validate', 'delete']: return jsonify({'error': 'Invalid action.'}), 400
        if action == 'validate':
            success, message = entry.validate()
        if action == 'delete':
            success, message = entry.delete()
        if success:
            flash(message, 'success')
            return jsonify({'success': message}), 200
        return jsonify({'error': message}),400
    if not entry:
        flash('Invalid entry ID.', 'error')
        return redirect(url_for('admin._view_entries'))
    test = entry['test']
    dataset = test.dataset
    dataset_path = dataset.get_file()
    with open(dataset_path, 'r') as _dataset:
        data = loads(_dataset.read())
    correct = get_correct_answers(dataset=data)
    return render_template('/admin/result-detail.html', entry = entry, correct = correct)

@admin.route('/certificate/',methods=['POST'])
@login_required
def _generate_certificate():
    from main import db
    id = request.get_json()['id']
    entry = Entry.query.filter_by(id=id).first()
    if not entry: return jsonify({'error': 'Invalid entry ID.'}), 404
    return render_template('/admin/components/certificate.html', entry = entry)