'use strict';
(function() {
    window.addEventListener('DOMContentLoaded', (event) => {
        setupPage();
    });

    function close_modal(node) {
        let current = node;
        while(current.nodeName != 'BACKDROP') {
            current = current.parentNode;
            if(current.nodeName === 'HTML') {
                console.error("can't find modal parent");
                return;
            }
        }
        current.parentNode.removeChild(current);
    }

    function display_create_form() {
        const template = document.querySelector('template#create-form')
              .content.cloneNode(true);
        const form = template.querySelector('form');
        form.addEventListener('submit', (event) => {
            event.preventDefault();
            const id = crypto.randomUUID();
            const name = form.name.value;
            if(!name) {
                return;
            }
            const description = form.description.value.trim();
            make_api_request('POST',
                             '/configs/' + id + '/create',
                             {'name': name,
                              'description': description})
                .then((response) => {display_configs(id)})
                .then((response) => {close_modal(form)})
                .catch((exception) => {
                    console.error('creation failed for: '+id, exception);
                });
        });
        display_modal(template);
    }

    function display_configs(...config_ids) {
        const configs_parent = document.querySelector('configs');
        const dlprefix = 'data:text/plain;charset:utf-8,';
        config_ids.forEach((config_id) => {
            const template = document.querySelector('template#display-config')
                  .content.cloneNode(true);
            const config = template.querySelector('config');
            make_api_request('GET', '/configs/' + config_id)
                .then((data) => {
                    config.id = 'config-' + config_id;
                    config.querySelector('name').textContent = data.name;
                    config.querySelector('date').textContent = data.created;
                    config.querySelector('description').textContent = data.description;
                    config.querySelector('data').textContent = data.data;
                    config.querySelector('qrcode').replaceWith(
                        QRCode({msg: data.data,
                                dim: 280,
                                pad: 0,
                                ecl: 'M'}));
                    const link = config.querySelector('.conffile');
                    link.setAttribute('href',
                                      dlprefix + encodeURIComponent(data.data));
                    link.setAttribute('download', data.name + '.conf');
                    config.querySelector('button.edit')
                        .addEventListener('click', (event) => {
                            display_edit_form(config_id, data);
                        });
                    config.querySelector('button.download')
                        .addEventListener('click', (event) => {
                            link.click();
                        });
                });
            const old = configs_parent.querySelector('#config-'+config_id);
            if(old) {
                old.replaceWith(template);
            } else {
                configs_parent.appendChild(template);
            }
        });
    }

    function display_edit_form(config_id, config) {
        const template = document.querySelector('template#update-form')
              .content.cloneNode(true);
        const form = template.querySelector('form');
        form.name.value = config.name;
        form.description.value = config.description;
        form.addEventListener('submit', (event) => {
            event.preventDefault();
        });
        const save_button = form.querySelector('button.save');
        save_button.addEventListener('click', (event) => {
            make_api_request('POST',
                             '/configs/' + config_id + '/update',
                             {'name': form.name.value,
                              'description': form.description.value.trim()})
                .then((response) => {display_configs(config_id)})
                .then((response) => {close_modal(form)})
                .catch((exception) => {
                    console.error('update failed for: '+config_id,
                                  exception);
            });
        });
        const delete_button = form.querySelector('button.delete');
        delete_button.addEventListener('click', (event) => {
            if(!window.confirm('Are you sure you want to delete this client?')) {
                return;
            }
            make_api_request('POST',
                             '/configs/' + config_id + '/delete')
                .then((response) => {
                    document.querySelector('#config-'+config_id).remove();
                })
                .then((response) => {close_modal(form)})
                .catch((exception) => {
                    console.error('deletion failed for: '+config_id,
                                  exception);
                });
        });
        display_modal(template);
    }

    function display_modal(fragment) {
        const modal = document.querySelector('template#modal')
              .content.cloneNode(true);
        modal.querySelector('wrapper').appendChild(fragment);

        const backdrop = modal.querySelector('backdrop');
        const cancel = modal.querySelector('button.cancel');
        backdrop.addEventListener('click', (event) => {
            if(event.target === backdrop
               || event.target === cancel) {
                close_modal(backdrop);
            }
        });

        document.querySelector('body').appendChild(modal);
    }

    function getCookies() {
        var out = new Object();
        const cookies = document.cookie.split('; ');
        cookies.forEach((cookie) => {
            const temp = cookie.split('=');
            const name = temp[0];
            const value = temp.slice(1).join('=');
            out[name] = value;
        });
        return out;
    }

    function login() {
        const current_path = window.location.pathname;
        return window.location.replace('/api/login?return='
                                       + current_path);
    }

    async function make_api_request(method, path, body) {
        const data = {'method': method,
                      'headers': {'Content-Type': 'application/json'}};
        if(method != 'GET') {
            data['body'] = JSON.stringify(body);
        }
        const request = new Request('/api' + path, data);
        const response = await fetch(request);
        if(response.status === 403) {
            console.log('doing login');
            login();
        }
        return response.json();
    }

    async function setupPage(route) {
        const configs = await make_api_request('GET', '/configs/');
        const cookies = getCookies();
        document.querySelector('user#banner-userid')
            .textContent = cookies['username'];
        document.querySelector('button#create-config')
            .addEventListener('click', (event) => {
                display_create_form();
            });
        await display_configs(...configs);
    }
})();