/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Red Hat. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
import fs = require('fs');
import { getErrorStatusDescription, xhr, XHRResponse } from 'request-light';
import * as URL from 'url';
import {
  createConnection,
  IConnection,
  InitializeResult,
  IPCMessageReader,
  IPCMessageWriter,
  RequestType,
  TextDocumentSyncKind,
} from 'vscode-languageserver';
import Strings = require('../src/languageservice/utils/strings');
import URI from '../src/languageservice/utils/uri';

namespace VSCodeContentRequest {
  export const type: RequestType<{}, {}, {}, {}> = new RequestType(
    'vscode/content'
  );
}

// Create a connection for the server.
let connection: IConnection = null;
if (process.argv.indexOf('--stdio') === -1) {
  connection = createConnection(
    new IPCMessageReader(process),
    new IPCMessageWriter(process)
  );
} else {
  connection = createConnection();
}

// After the server has started the client sends an initialize request. The server receives
// in the passed params the rootPath of the workspace plus the client capabilities.
let workspaceRoot: string;
connection.onInitialize(
  (params): InitializeResult => {
    workspaceRoot = params.rootPath;
    return {
      capabilities: {
        // Tell the client that the server works in FULL text document sync mode
        textDocumentSync: TextDocumentSyncKind.Full,
        // Tell the client that the server support code complete
        completionProvider: {
          resolveProvider: false,
        },
      },
    };
  }
);

export let workspaceContext = {
  resolveRelativePath: (relativePath: string, resource: string) => {
    return URL.resolve(resource, relativePath);
  },
};

export let schemaRequestService = (uri: string): Thenable<string> => {
  if (Strings.startsWith(uri, 'file://')) {
    const fsPath = URI.parse(uri).fsPath;
    return new Promise<string>((c, e) => {
      fs.readFile(fsPath, 'UTF-8', (err, result) => {
        err ? e('') : c(result.toString());
      });
    });
  } else if (Strings.startsWith(uri, 'vscode://')) {
    return connection.sendRequest(VSCodeContentRequest.type, uri).then(
      responseText => {
        return responseText;
      },
      error => {
        return error.message;
      }
    );
  }
  return xhr({ url: uri, followRedirects: 5 }).then(
    response => {
      return response.responseText;
    },
    (error: XHRResponse) => {
      return Promise.reject(
        error.responseText ||
          getErrorStatusDescription(error.status) ||
          error.toString()
      );
    }
  );
};