import {convert} from 'insomnia-importers';
import * as db from './database';
import * as models from '../models';
import {getAppVersion} from './constants';
import * as misc from './misc';
import {showModal} from '../ui/components/modals/index';
import AlertModal from '../ui/components/modals/alert-modal';
import * as fetch from './fetch';
import fs from 'fs';
import {trackEvent} from '../analytics/index';

const EXPORT_FORMAT = 3;

const EXPORT_TYPE_REQUEST = 'request';
const EXPORT_TYPE_REQUEST_GROUP = 'request_group';
const EXPORT_TYPE_WORKSPACE = 'workspace';
const EXPORT_TYPE_COOKIE_JAR = 'cookie_jar';
const EXPORT_TYPE_ENVIRONMENT = 'environment';

// If we come across an ID of this form, we will replace it with a new one
const REPLACE_ID_REGEX = /^__\w+_\d+__$/;

const MODELS = {
  [EXPORT_TYPE_REQUEST]: models.request,
  [EXPORT_TYPE_REQUEST_GROUP]: models.requestGroup,
  [EXPORT_TYPE_WORKSPACE]: models.workspace,
  [EXPORT_TYPE_COOKIE_JAR]: models.cookieJar,
  [EXPORT_TYPE_ENVIRONMENT]: models.environment
};

export async function importUri (workspaceId, uri) {
  let rawText;
  if (uri.match(/^(http|https):\/\//)) {
    const response = await fetch.rawFetch(uri);
    rawText = await response.text();
  } else if (uri.match(/^(file):\/\//)) {
    const path = uri.replace(/^(file):\/\//, '');
    rawText = fs.readFileSync(path, 'utf8');
  } else {
    throw new Error(`Invalid import URI ${uri}`);
  }

  const workspace = await models.workspace.getById(workspaceId);
  const result = await importRaw(workspace, rawText);
  const {summary, source, error} = result;

  if (error) {
    showModal(AlertModal, {title: 'Import Failed', message: error});
    return;
  }

  let statements = Object.keys(summary).map(type => {
    const count = summary[type].length;
    const name = models.getModelName(type, count);
    return count === 0 ? null : `${count} ${name}`;
  }).filter(s => s !== null);

  let message;
  if (statements.length === 0) {
    message = 'Nothing was found to import.';
  } else {
    message = `You imported ${statements.join(', ')}!`;
  }
  showModal(AlertModal, {title: 'Import Succeeded', message});
  trackEvent('Import', 'Success', source);
}

export async function importRaw (workspace, rawContent, generateNewIds = false) {
  let results;
  try {
    results = convert(rawContent);
  } catch (e) {
    console.warn('Failed to import data', e);
    return {
      source: 'not found',
      error: 'No importers found for file',
      summary: {}
    };
  }

  const {data} = results;
  console.log('IMPORTING', JSON.parse(rawContent));

  // Fetch the base environment in case we need it
  const baseEnvironment = await models.environment.getOrCreateForWorkspace(workspace);

  // Generate all the ids we may need
  const generatedIds = {};
  for (const r of data.resources) {
    if (generateNewIds || r._id.match(REPLACE_ID_REGEX)) {
      generatedIds[r._id] = misc.generateId(MODELS[r._type].prefix);
    }
  }

  // Always replace these "constants"
  generatedIds['__WORKSPACE_ID__'] = workspace._id;
  generatedIds['__BASE_ENVIRONMENT_ID__'] = baseEnvironment._id;

  // Import everything backwards so they get inserted in the correct order
  data.resources.reverse();

  const importedDocs = {};
  for (const model of models.all()) {
    importedDocs[model.type] = [];
  }

  for (const resource of data.resources) {
    // Buffer DB changes
    // NOTE: Doing it inside here so it's more "scalable"
    db.bufferChanges(100);

    // Replace null parentIds with current workspace
    if (!resource.parentId) {
      resource.parentId = '__WORKSPACE_ID__';
    }

    // Replace _id if we need to
    if (generatedIds[resource._id]) {
      resource._id = generatedIds[resource._id];
    }

    // Replace newly generated IDs if they exist
    if (generatedIds[resource.parentId]) {
      resource.parentId = generatedIds[resource.parentId];
    }

    const model = MODELS[resource._type];
    if (!model) {
      console.warn('Unknown doc type for import', resource._type);
      continue;
    }

    const doc = await model.getById(resource._id);
    const newDoc = doc ? await model.update(doc, resource) : await model.create(resource);

    importedDocs[newDoc.type].push(newDoc);
  }

  db.flushChanges();

  return {
    source: results.type.id,
    summary: importedDocs,
    error: null
  };
}

export async function exportJSON (parentDoc = null) {
  const data = {
    _type: 'export',
    __export_format: EXPORT_FORMAT,
    __export_date: new Date(),
    __export_source: `insomnia.desktop.app:v${getAppVersion()}`,
    resources: {}
  };

  const docs = await db.withDescendants(parentDoc);

  data.resources = docs.filter(d => (
    !d.isPrivate && (
      d.type === models.request.type ||
      d.type === models.requestGroup.type ||
      d.type === models.workspace.type ||
      d.type === models.cookieJar.type ||
      d.type === models.environment.type
    )
  )).map(d => {
    if (d.type === models.workspace.type) {
      d._type = EXPORT_TYPE_WORKSPACE;
    } else if (d.type === models.cookieJar.type) {
      d._type = EXPORT_TYPE_COOKIE_JAR;
    } else if (d.type === models.environment.type) {
      d._type = EXPORT_TYPE_ENVIRONMENT;
    } else if (d.type === models.requestGroup.type) {
      d._type = EXPORT_TYPE_REQUEST_GROUP;
    } else if (d.type === models.request.type) {
      d._type = EXPORT_TYPE_REQUEST;
    }

    // Delete the things we don't want to export
    delete d.type;
    delete d.isPrivate;
    return d;
  });

  return JSON.stringify(data, null, '\t');
}