const asyncWrapper = require('../middleware/asyncWrapper');
const ErrorResponse = require('../utils/ErrorResponse');
const App = require('../models/App');
const Config = require('../models/Config');
const { Sequelize } = require('sequelize');
const axios = require('axios');
const Logger = require('../utils/Logger');
const logger = new Logger();
const k8s = require('@kubernetes/client-node');

// @desc      Create new app
// @route     POST /api/apps
// @access    Public
exports.createApp = asyncWrapper(async (req, res, next) => {
  // Get config from database
  const pinApps = await Config.findOne({
    where: { key: 'pinAppsByDefault' },
  });

  let app;
  let _body = { ...req.body };

  if (req.file) {
    _body.icon = req.file.filename;
  }

  if (pinApps) {
    if (parseInt(pinApps.value)) {
      app = await App.create({
        ..._body,
        isPinned: true,
      });
    } else {
      app = await App.create(req.body);
    }
  }

  res.status(201).json({
    success: true,
    data: app,
  });
});

// @desc      Get all apps
// @route     GET /api/apps
// @access    Public
exports.getApps = asyncWrapper(async (req, res, next) => {
  // Get config from database
  const useOrdering = await Config.findOne({
    where: { key: 'useOrdering' },
  });
  const useDockerApi = await Config.findOne({
    where: { key: 'dockerApps' },
  });
  const useKubernetesApi = await Config.findOne({
    where: { key: 'kubernetesApps' },
  });
  const unpinStoppedApps = await Config.findOne({
    where: { key: 'unpinStoppedApps' },
  });

  const orderType = useOrdering ? useOrdering.value : 'createdAt';
  let apps;

  if (useDockerApi && useDockerApi.value == 1) {
    let containers = null;

    const host = await Config.findOne({
      where: { key: 'dockerHost' },
    });

    try {
      if (host.value.includes('localhost')) {
        let { data } = await axios.get(
          `http://${host.value}/containers/json?{"status":["running"]}`,
          {
            socketPath: '/var/run/docker.sock',
          }
        );
        containers = data;
      } else {
        let { data } = await axios.get(
          `http://${host.value}/containers/json?{"status":["running"]}`
        );
        containers = data;
      }
    } catch {
      logger.log(`Can't connect to the docker api on ${host.value}`, 'ERROR');
    }

    if (containers) {
      apps = await App.findAll({
        order: [[orderType, 'ASC']],
      });

      containers = containers.filter((e) => Object.keys(e.Labels).length !== 0);
      const dockerApps = [];
      for (const container of containers) {
        let labels = container.Labels;

        if (!('flame.url' in labels)) {
          for (const label of Object.keys(labels)) {
            if (/^traefik.*.frontend.rule/.test(label)) {
              // Traefik 1.x
              let value = labels[label];
              if (value.indexOf('Host') !== -1) {
                value = value.split('Host:')[1];
                labels['flame.url'] = 'https://' + value.split(',').join(';https://');
              }
            } else if (/^traefik.*?\.rule/.test(label)) {
              // Traefik 2.x
              const value = labels[label];
              if (value.indexOf('Host') !== -1) {
                const regex = /\`([a-zA-Z0-9\.\-]+)\`/g;
                const domains = []
                while ((match = regex.exec(value)) != null) {
                  domains.push('http://' + match[1]);
                }
                if (domains.length > 0) {
                  labels['flame.url'] = domains.join(';');
                }
              }
            }
          }
        }

        if (
          'flame.name' in labels &&
          'flame.url' in labels &&
          /^app/.test(labels['flame.type'])
        ) {
          for (let i = 0; i < labels['flame.name'].split(';').length; i++) {
            const names = labels['flame.name'].split(';');
            const urls = labels['flame.url'].split(';');
            let icons = '';

            if ('flame.icon' in labels) {
              icons = labels['flame.icon'].split(';');
            }

            dockerApps.push({
              name: names[i] || names[0],
              url: urls[i] || urls[0],
              icon: icons[i] || 'docker',
            });
          }
        }
      }

      if (unpinStoppedApps && unpinStoppedApps.value == 1) {
        for (const app of apps) {
          await app.update({ isPinned: false });
        }
      }

      for (const item of dockerApps) {
        if (apps.some((app) => app.name === item.name)) {
          const app = apps.filter((e) => e.name === item.name)[0];

          if (item.icon === 'custom') {
            await app.update({
              name: item.name,
              url: item.url,
              isPinned: true,
            });
          } else {
            await app.update({
              name: item.name,
              url: item.url,
              icon: item.icon,
              isPinned: true,
            });
          }
        } else {
          await App.create({
            name: item.name,
            url: item.url,
            icon: item.icon === 'custom' ? 'docker' : item.icon,
            isPinned: true,
          });
        }
      }
    }
  }

  if (useKubernetesApi && useKubernetesApi.value == 1) {
    let ingresses = null;

    try {
      const kc = new k8s.KubeConfig();
      kc.loadFromCluster();
      const k8sNetworkingV1Api = kc.makeApiClient(k8s.NetworkingV1Api);
      await k8sNetworkingV1Api.listIngressForAllNamespaces().then((res) => {
        ingresses = res.body.items;
      });
    } catch {
      logger.log("Can't connect to the kubernetes api", 'ERROR');
    }

    if (ingresses) {
      apps = await App.findAll({
        order: [[orderType, 'ASC']],
      });

      ingresses = ingresses.filter(
        (e) => Object.keys(e.metadata.annotations).length !== 0
      );
      const kubernetesApps = [];
      for (const ingress of ingresses) {
        const annotations = ingress.metadata.annotations;

        if (
          'flame.pawelmalak/name' in annotations &&
          'flame.pawelmalak/url' in annotations &&
          /^app/.test(annotations['flame.pawelmalak/type'])
        ) {
          kubernetesApps.push({
            name: annotations['flame.pawelmalak/name'],
            url: annotations['flame.pawelmalak/url'],
            icon: annotations['flame.pawelmalak/icon'] || 'kubernetes',
          });
        }
      }

      if (unpinStoppedApps && unpinStoppedApps.value == 1) {
        for (const app of apps) {
          await app.update({ isPinned: false });
        }
      }

      for (const item of kubernetesApps) {
        if (apps.some((app) => app.name === item.name)) {
          const app = apps.filter((e) => e.name === item.name)[0];
          await app.update({ ...item, isPinned: true });
        } else {
          await App.create({
            ...item,
            isPinned: true,
          });
        }
      }
    }
  }

  if (orderType == 'name') {
    apps = await App.findAll({
      order: [[Sequelize.fn('lower', Sequelize.col('name')), 'ASC']],
    });
  } else {
    apps = await App.findAll({
      order: [[orderType, 'ASC']],
    });
  }

  if (process.env.NODE_ENV === 'production') {
    // Set header to fetch containers info every time
    res.status(200).setHeader('Cache-Control', 'no-store').json({
      success: true,
      data: apps,
    });
    return;
  }

  res.status(200).json({
    success: true,
    data: apps,
  });
});

// @desc      Get single app
// @route     GET /api/apps/:id
// @access    Public
exports.getApp = asyncWrapper(async (req, res, next) => {
  const app = await App.findOne({
    where: { id: req.params.id },
  });

  if (!app) {
    return next(
      new ErrorResponse(`App with id of ${req.params.id} was not found`, 404)
    );
  }

  res.status(200).json({
    success: true,
    data: app,
  });
});

// @desc      Update app
// @route     PUT /api/apps/:id
// @access    Public
exports.updateApp = asyncWrapper(async (req, res, next) => {
  let app = await App.findOne({
    where: { id: req.params.id },
  });

  if (!app) {
    return next(
      new ErrorResponse(`App with id of ${req.params.id} was not found`, 404)
    );
  }

  let _body = { ...req.body };

  if (req.file) {
    _body.icon = req.file.filename;
  }

  app = await app.update(_body);

  res.status(200).json({
    success: true,
    data: app,
  });
});

// @desc      Delete app
// @route     DELETE /api/apps/:id
// @access    Public
exports.deleteApp = asyncWrapper(async (req, res, next) => {
  await App.destroy({
    where: { id: req.params.id },
  });

  res.status(200).json({
    success: true,
    data: {},
  });
});

// @desc      Reorder apps
// @route     PUT /api/apps/0/reorder
// @access    Public
exports.reorderApps = asyncWrapper(async (req, res, next) => {
  req.body.apps.forEach(async ({ id, orderId }) => {
    await App.update(
      { orderId },
      {
        where: { id },
      }
    );
  });

  res.status(200).json({
    success: true,
    data: {},
  });
});