from . import query_results
from . import tasks
from .. import db
from ..corpora.forms import DisplayOptionsForm, InspectDisplayOptionsForm
from ..models import QueryResult
from .forms import AddQueryResultForm
from flask import (abort, current_app, flash, make_response, redirect,
                   render_template, request, send_from_directory, url_for)
from flask_login import current_user, login_required
import json
import os
from jsonschema import validate


@query_results.route('/add', methods=['GET', 'POST'])
@login_required
def add_query_result():
    '''
    View to import a result as a json file.
    '''
    add_query_result_form = AddQueryResultForm(prefix='add-query-result-form')
    if add_query_result_form.is_submitted():
        if not add_query_result_form.validate():
            return make_response(add_query_result_form.errors, 400)
        query_result = QueryResult(
            creator=current_user,
            description=add_query_result_form.description.data,
            filename=add_query_result_form.file.data.filename,
            title=add_query_result_form.title.data
        )
        db.session.add(query_result)
        db.session.commit()
        # create paths to save the uploaded json file
        query_result_dir = os.path.join(current_app.config['NOPAQUE_STORAGE'],
                                        str(current_user.id),
                                        'query_results',
                                        str(query_result.id))
        try:
            os.makedirs(query_result_dir)
        except Exception:
            db.session.delete(query_result)
            db.session.commit()
            flash('Internal Server Error', 'error')
            redirect_url = url_for('query_results.add_query_result')
            return make_response({'redirect_url': redirect_url}, 500)
        # save the uploaded file
        query_result_file_path = os.path.join(query_result_dir,
                                              query_result.filename)
        add_query_result_form.file.data.save(query_result_file_path)
        # parse json from file
        with open(query_result_file_path, 'r') as file:
            query_result_file_content = json.load(file)
        # parse json schema
        with open('app/static/json_schema/nopaque_cqi_py_results_schema.json', 'r') as file:  # noqa
            schema = json.load(file)
        try:
            # validate imported json file
            validate(instance=query_result_file_content, schema=schema)
        except Exception:
            tasks.delete_query_result(query_result.id)
            flash('Uploaded file is invalid', 'result')
            redirect_url = url_for('query_results.add_query_result')
            return make_response({'redirect_url': redirect_url}, 201)
        query_result_file_content.pop('matches')
        query_result_file_content.pop('cpos_lookup')
        query_result.query_metadata = query_result_file_content
        db.session.commit()
        flash('Query result added!', 'result')
        redirect_url = url_for('query_results.query_result',
                               query_result_id=query_result.id)
        return make_response({'redirect_url': redirect_url}, 201)
    return render_template('corpora/query_results/add_query_result.html.j2',
                           add_query_result_form=add_query_result_form,
                           title='Add query result')


@query_results.route('/<int:query_result_id>')
@login_required
def query_result(query_result_id):
    query_result = QueryResult.query.get_or_404(query_result_id)
    if not (query_result.creator == current_user
            or current_user.is_administrator()):
        abort(403)
    return render_template('corpora/query_results/query_result.html.j2',
                           query_result=query_result,
                           title='Query result')


@query_results.route('/<int:query_result_id>/inspect')
@login_required
def inspect_query_result(query_result_id):
    '''
    View to inspect imported result file in a corpus analysis like interface
    '''
    query_result = QueryResult.query.get_or_404(query_result_id)
    query_metadata = query_result.query_metadata
    if not (query_result.creator == current_user
            or current_user.is_administrator()):
        abort(403)
    display_options_form = DisplayOptionsForm(
        prefix='display-options-form',
        results_per_page=request.args.get('results_per_page', 30),
        result_context=request.args.get('context', 20)
    )
    inspect_display_options_form = InspectDisplayOptionsForm(
        prefix='inspect-display-options-form'
    )
    query_result_file_path = os.path.join(
        current_app.config['NOPAQUE_STORAGE'],
        str(current_user.id),
        'query_results',
        str(query_result.id),
        query_result.filename
    )
    with open(query_result_file_path, 'r') as query_result_file:
        query_result_file_content = json.load(query_result_file)
    return render_template('corpora/query_results/inspect.html.j2',
                           display_options_form=display_options_form,
                           inspect_display_options_form=inspect_display_options_form,
                           query_result_file_content=query_result_file_content,
                           query_metadata=query_metadata,
                           title='Inspect query result')


@query_results.route('/<int:query_result_id>/delete')
@login_required
def delete_query_result(query_result_id):
    query_result = QueryResult.query.get_or_404(query_result_id)
    if not (query_result.creator == current_user
            or current_user.is_administrator()):
        abort(403)
    tasks.delete_query_result(query_result_id)
    flash('Query result deleted!', 'result')
    return redirect(url_for('services.service', service="corpus_analysis"))


@query_results.route('/<int:query_result_id>/download')
@login_required
def download_query_result(query_result_id):
    query_result = QueryResult.query.get_or_404(query_result_id)
    if not (query_result.creator == current_user
            or current_user.is_administrator()):
        abort(403)
    query_result_dir = os.path.join(current_app.config['NOPAQUE_STORAGE'],
                                    str(current_user.id),
                                    'query_results',
                                    str(query_result.id))
    return send_from_directory(as_attachment=True,
                               directory=query_result_dir,
                               filename=query_result.filename)