'use strict';

import * as vscode from 'vscode';

import * as proxy from './jediProxy';

import * as telemetryContracts from "../common/telemetryContracts";

export class PythonReferenceProvider implements vscode.ReferenceProvider {

private jediProxyHandler: proxy.JediProxyHandler<proxy.IReferenceResult>;

public constructor(context: vscode.ExtensionContext, jediProxy: proxy.JediProxy = null) {

this.jediProxyHandler = new proxy.JediProxyHandler(context, jediProxy);

}

private static parseData(data: proxy.IReferenceResult): vscode.Location[] {

if (data && data.references.length > 0) {

var references = data.references.filter(ref => {

if (!ref || typeof ref.columnIndex !== 'number' || typeof ref.lineIndex !== 'number'

|| typeof ref.fileName !== 'string' || ref.columnIndex === -1 || ref.lineIndex === -1 || ref.fileName.length === 0) {

return false;

}

return true;

}).map(ref => {

var definitionResource = vscode.Uri.file(ref.fileName);

var range = new vscode.Range(ref.lineIndex, ref.columnIndex, ref.lineIndex, ref.columnIndex);

return new vscode.Location(definitionResource, range);

});

return references;

}

return [];

}

public provideReferences(document: vscode.TextDocument, position: vscode.Position, context: vscode.ReferenceContext, token: vscode.CancellationToken): Thenable<vscode.Location[]> {

var filename = document.fileName;

if (document.lineAt(position.line).text.match(/^\s*\/\//)) {

return Promise.resolve(null);

}

if (position.character <= 0) {

return Promise.resolve(null);

}

var range = document.getWordRangeAtPosition(position);

var columnIndex = range.isEmpty ? position.character : range.end.character;

var cmd: proxy.ICommand<proxy.IReferenceResult> = {

command: proxy.CommandType.Usages,

fileName: filename,

columnIndex: columnIndex,

lineIndex: position.line

};

if (document.isDirty) {

cmd.source = document.getText();

}

return this.jediProxyHandler.sendCommand(cmd, token).then(data => {

return PythonReferenceProvider.parseData(data);

});

}

}